Stopper of hydraulic pressure rubber is sealed structural function and use

The use of the weather strip of balata of performance characteristics hydraulic pressure of weather strip of balata of 1 hydraulic pressure must satisfy the following function: It is leakage rate minimum. The leakage rate of weather strip of demand hydraulic pressure is dinky, have favorable sealed effect, raise its automatically along with the pressure heighten of hydraulic pressure oil sealed action, although be below the abominable work environment such as high pressure and high temperature, the leakage rate of hydraulic pressure weather strip also does not have apparent addition; 2 it is good consistence. Because hydraulic pressure weather strip immerses for a long time,be in hydraulic pressure oil, extremely easy dissolve bilges, deliquescent or fragile change harden etc, made funeral give away official secrets seals action, because this asks hydraulic pressure weather strip has good consistence to hydraulic pressure oil; 3 it is attrition obstruction small. Produce the undesirable phenomenon such as low-pressure crawl to avoid or reduce hydraulic pressure facility, weather strip of demand hydraulic pressure has inferior static friction obstruction and kinetic friction resistance, and its coefficient of friction should extraordinary stability; 4 it is service life grows. Hydraulic pressure weather strip should have sex of good flexibility, hear resistance, cold-resistant, compression sex, wearability and certain physics mechanical intensity, and service life grows; 5 be it is the price cheap. Hydraulic pressure weather strip should be made easily and install, its corresponding sealed chamfer is machined easily again make, wait for a requirement to the treatment precision of sealing contact surface inferior, and low standard is low. It is sealing to sealed main demand good, on the safe side, life is long, answer structure of do one's best is compact, the system is simple, production maintenance is convenient, cost is low. Most weather strip is fragile, should assure interchangeability, realize standardization, seriation. 1.

The sealed mechanism of weather strip of balata of 2 hydraulic pressure is sealed can divide for static sealed and move sealed two kinds big. Static sealed and main have mat fluid sealant is sealed, sealed with direct contact kinds thick inside back cover is big. It is sealed and OK to move cent is rotate sealed with move back and forth sealed two kinds of main types. Whether is the component that with its by weather strip action moves relatively contacted, can divide for contact sealed with blame contact sealed. Say commonly, the sealing with sealed contact is good, but suffer attrition to wear away limitation, apply to the circumstance with sealing surface inferior linear velocity. The sealing with blame sealed contact is poorer, apply to the circumstance of higher rate. The sealed mechanism of weather strip involves two elements, one is housing is sealed, basically be the predestined relationship outside weather strip (static component) the fixed position in housing; The 2 trends that are sealed lip mouth and contact of surface of runner shaft coming back are sealed, this is the mainest function of weather strip. The sealed function that the sealed mechanism of the area of sealed lip contact of weather strip has to weather strip place has all in all sense, it depends on: The design of sealed lip; The structure of stretch material; The surface roughness of axial surface. The put together collaboration that the angle of the radial load of sealed lip, sealed lip is designed and the distance of labial needle and bedspring center designs is used, generated the osculatory pressure that asymmetry of face of a kind of countershaft distributings: In oily lateral pressure the biggest steep litre increase; Small angle attenuation is shown in air lateral pressure. In interference (the internal diameter of sealed lip is in free condition, it is the diameter that compares an axis without the design below bear case slightly small) cooperate to fall, this kind of asymmetry that contacts pressure distributings, what arise with runner shaft coming back is circumferential and annular the combined action of close band force, the structural character that brings about sealed lip to contact an area is out of shape. When this kind of sealed elastomer is out of shape the structure is oil seal test run, form, having conclusive effect to sealed function. Accordingly, weather strip needs a test run adjust period. The influence of corkscrewed yarn adds the whirl of upper shaft, be out of shape by this kind tectonic generation absorbs effect to the pump of oily side. The viscosity that sealed lip mouth slides the attrition character of the face suffers a fluid and sliding velocity control weather strip, on this slip face film having oil exists. The mutual sliding surface of weather strip and axis is below the lubricant condition of this oily membrane separation motion, because this retains attrition power small, wear away little. Oily on face of weather strip sliding contact flow is the loop that flows to oily side to flow to atmosphere side from oily side again from atmosphere side. Of slip face lubricant and good, can prevent tatty to undertake, do not have leak from this. Visible, material of mouth of lip of sealed to oil seal lip, these two lubricant character that the element has delicate control affects weather strip thereby mix labial department figure sealed principle, it is crucial. Weather strip of commonly used self-given type impaction hydraulic pressure basically is O form sealing ring, circular sealing ring and quadrate sealing ring, they have a structure simple, make easily, cost is low wait for an advantage, accordingly they are fluid drive system in apply extensively use sealed component and static sealed cell. Their installation produces 10 ～ normally inside sealed chamfer the radial of 25% is compressed be out of shape, arise to sealing contact surface relatively the upland is initiative osculatory stress, prevent thereby without pressure liquid leak. When hydraulic pressure crock works, pressure liquid extruding is self-given weather strip of type impaction hydraulic pressure, those who make is farther be out of shape, bigger to generation of sealing contact surface along with pressure liquid pressure, say strictly to should be intensity of pressure. Heighten and the add contact stress of heighten, prevent pressure liquid leak jointly together with initiative contact stress. But when actuating pressure is more than 10MPa, pledge to avoid synthetic rubber the one part of weather strip of self-given type impaction hydraulic pressure by impact sealed clearance and in hydraulic pressure crock leak is caused by cut away in reciprocate, must pledge in synthetic rubber the press press side of weather strip of self-given type impaction hydraulic pressure installs back-up ring of one synthetic resin each, if nylon back-up ring, polyformaldehyde back-up ring is mixed,fill gets together back-up ring of 4 fluorine ethylene. Because synthetic rubber pledges when weather strip works, self-given type impaction hydraulic pressure has bigger compression to be out of shape, because resistance of this its static friction is extraordinary big, be obstruction of its kinetic friction normally double much. So great static friction resistance creates the undesirable appearance such as low-pressure crawl and operation difficulty in the certainly will in system of a few low-pressure fluid drive, this is weather strip of self-given type impaction hydraulic pressure very little sheet uses as alone the account that uses weather strip. The utility of oil seal of framework of balata of 2 hydraulic pressure and dustproof circle and structural characteristic 2.

The utility of oil seal of framework of balata of 1 hydraulic pressure and structural characteristic oil seal are to use what the axis rotates in equipment at sealed machinery to seal oil to use sealed cell, and housing basically is dormant, so oil seal calls form of lip of runner shaft coming back sealing ring again. Be being spent according to installing hole and the coaxial that sealed axis place asks is certainly inside framework oil seal or outside framework oil seal; The will decide place of framework oil seal is used material according to working environment temperature is qualitative; Outside framework oil seal, common calls iron carapace oil seal. As a result of its accurate coaxial is spent, be used extensively at accurate and mechanical equipment or requirement axis Gao Xuan to turn the sealed system that coaxial spends. The framework oil seal that chooses to place of the large facility that weigh instrument asks to have taller steel sex commonly, because this answers preferential choose SB, TB oil seal. When having higher demand to the steel sex of oil seal, recommend choose SA, TA model outside framework oil seal. To rotating the runner shaft with inferior torque, be like small-sized electric machinery, should choose the framework oil seal that does not take spring: VC, VB, KV, KB. Framework oil seal is used in runner shaft of tall, low speed coming back commonly, highest rotate top speed of 15m/s of linear velocity ≤ , reciprocate forms a cluster 0.

1m/s. Actuating pressure ＜ 0.

05MPa. Because mechanical attrition part runs in machinery from time to tome oil is entered, use oil seal from the leak in mechanical clearance to prevent these oil, the leak that and return need besides oil prevents water and chemical medicine fluid and dirt Egypt earth are arenaceous from exterior invade a person, also want to use the encapsulated situation of oil seal at that time, it is the static state is between the predestined relationship outside oil seal and housing sealed, the reliable fixed position of the predestined relationship outside assuring oil seal at the same time between housing. 2 it is oil seal the encapsulated situation between sealed lip and axis, it is trends when the axis rotates sealed, it is a static state when the axis is dormant sealed. The integrated action of all sorts of influencing factor reachs its interaction, produced very big effect to the sealed function of oil seal and service life. Oil seal is main by sealed body, strengthen framework and comprise from a few parts such as close helix bedspring. Sealed body is divided again according to different position wait for bottom, waist, point and sealed lip. Metallic framework as the reinforcing steel bar inside concrete component, have strengthened effect, make oil seal can maintain appearance and pulling force. Normally, in the framework oil seal below free condition, its internal diameter is smaller than axial diameter, it is certain to be had namely " interference " . Accordingly, load oil seal when oil seal after going up with the axis, the pressure of oil seal point and the contractive force countershaft that tighten helix bedspring oneself produce certain radial to tighten force, after moving through period of time, this pressure can be reduced quickly and even disappear, consequently, add bedspring to be able to compensate oil seal to tighten force oneself at any time. While the predestined relationship outside oil seal makes oil seal is secured inside housing aperture, the fluid prevents since leak reachs the action that invades a person between the interface from the surface inside face of the week outside oil seal and housing. Additionally metallic framework is secure when oil seal inside housing when, the action that coordinates force holds since. Sealed lip ministry is flexible elastomer, the shakes the pressure that reachs sealant to change influence that designs didymous machine falls to still can hold stable sealed action, rise to maintain labial ministry and axial surface stability to contact the action of condition. Bedspring can raise sealed lip the thrust to the axis, have the effect that maintains this thrust. Labial end ministry is made inclined carve appearance, the face that press an axis is pressed in the place that carry a department, have the effect of sealant. Dustproof lip is to do not have as deputy as bedspring connective lip, have the effect that avoids dust to invade a person. Oil seal is exterior use the static thick front cover that assures pair of housing to use for cylinder form inside the predestined relationship outside the balata that includes metallic framework; Use appear of metallic framework outside predestined relationship, need polishing and plating spread mostly preservative coating. Assure the sealed dependability with axial trends and sealed static state of the sealed lip of bedspring. The course develops the result of research for a long time, the sealed lip structure of oil seal improves admirable performance, raise the sealed dependability inside wider bear range then. Add dustproof lip, perhaps issue adoption many dustproof lips in special situation, can prevent outside contaminant and dirt to invade. The framework of Nextpage oil seal and bedspring are the metal is made, the body such as sealed lip mouth is balata. Oil seal basis uses an environment, can have production with different balata, in order to satisfy sealed function and requirement. The most commonly used oil resistant balata is fourth eyeball balata, fourth eyeball balata is at present oil seal and O circle uses one of the most general balata. Can saying is current utility the balata weather strip of lowest of the widest, cost. Production oil seal is commonly used still have get together balata of third acerbity cruel, silicon balata, fluorine balata and get together 4 fluorine ethylene. The occasion that oil seal place uses, its applicable sealed medium is grease and mineral lubricating oil, synthesis lube, grease commonly. Fall in special situation also but the acid with sealed low lubricity kind, alkaline kind, organic dissolvent kind wait for caustic medium. The oil seal that uses fluorine balata data normally its corrosion resistance, high temperature resistant what the gender should pledge than NBR material is good, be in without lubricant, pure dry the oil seal that the proposal below the condition with much medium uses PTFE sealed lip to make, its are sealed the lip has sufficient lubricant capacity, reduce labial edge greatly wear away. Individual oil seal is unfavorable and sealed two kinds of different medium, much chemical material increased the influence of quality to oil seal material performance, oil seal should pass lab test to decide to the consistence of sealed medium. The pollution of sealed medium may be the casting arenaceous hangover of bequeath of the housing cast process that make; Or from rotate component wears away because of attrition the grain content of generation. For example of the bronze turbine in turbine gear case wear away content; The product that perhaps produces by caustic medium. To avoid the pollutes pair of sealed character negative effect of sealed medium, must notice to maintain housing cleanness as far as possible. 2.

Crock of all hydraulic pressure must install characteristics of 2 function of sealed and dustproof circle dustproof circle. When piston lever returns, dustproof circle will be stuck in its apparently dirty content scrapes, protective sealing ring and oriented set avoid damage to hurt. Dustproof circle holds double action concurrently to assist sealed function, edge of its inside lip scrapes conglutinate is in piston staff is apparently fat film, improve sealed result thereby. The component of hydraulic pressure equipment with dustproof decisive to protection sealing ring is extremely important. Infiltration dust, wear away not only weather strip, and meeting greatly wear away oriented cover and piston lever, foreign matter enters hydraulic pressure medium in, also can affect the function that handles a powerful person and pump, yi Ke can injure these device. Dustproof circle can get rid of piston lever apparently dust, but do not damage the oily film on piston lever, of this pair of weather strip lubricant beneficial also. When dustproof circle is being designed, want to get used to piston lever not only, still must have sealed effect in groove. Dynamic function: A significant dustproof group, the contact of posture of its lip mouth to piston lever force must enough big. The stretch stuff that has quite tall hardness gets this kind of result the most easily. Hardness amounts to 94 ° get together amine vinegar is special the material that applies to dustproof circle. Its character still includes high standard to measure (hardness) , wonderful wearability and low pressure shrink quality. This kind of material can apply in from - 40 ° use an occasion to the great majority of limits of 100 ° temperature. Static function: The design is used at enclosed install groove use dustproof group without buildup monoculture, significant sealed effect has very hard in groove. This cooperates installation. Only the contact of sealed lip and piston lever is offerred dustproof circle and cylindrical sealed power of the surface. When thermal drop is small, whole and dustproof circle is contractive, between its external diameter and groove divulge a risk to be able to appear. Want to obtain satisfactory result, this kind of circumstance tries to compensate in the design of dustproof circle necessarily. The sort of weather strip of balata of 3 common hydraulic pressure and structural characteristic 3.

The weather strip of hydraulic pressure combination with commonly used crock of hydraulic pressure of equipment of machinery of hydraulic pressure of 1 lip weather strip basically is by etc of sealing ring of form of sealing ring of form of O form sealing ring and quadrate sealing ring, U form sealing ring, Y, YX the overlay of the hydraulic pressure sealing ring of special appearance is used form. V form sealing ring: The sealed performance of Y form sealing ring is better, can decide according to the size of actuating pressure place uses the number of sealing ring, normally beard have the aid of compensates the wear extent of sealing ring at the adjustment of gland, its fatal weak point is a structure complex, must mix by bearing annulus, sealing ring normally press annulus 3 parts composition, its attrition resistance is greater increase along with actuating pressure and sealing ring numerary and increase. Use at the hydraulic pressure crock with athletic speed is inferior and higher actuating pressure aptly only because of sealing ring of this V form. U form sealing ring: It is the most commonly used oil seal in hydraulic pressure crock, it is a kind of typical labial mouth weather strip, no matter be used at the piston,lever or piston can achieve favorable sealed result. U form circle falls in low-pressure circumstance, rely on labial ministry only be filled with too be out of shape ability arises sealed, because osculatory area is lesser, attrition force is relatively inferior. Lift as pressure, deflection of labial mouth flexibility increases, drawing, compress reach curve stress to increase, u form encircles radial thrust to greaten automatically, the length that contacts with sealing surface increases ceaselessly, encircle whole axial length and sealing surface contact till U form, assure to good sealing is had below high-pressured condition thereby. The sealed performance of U form sealing ring is better, but be being used alone is extremely easy roll, because this needs to pledge with stannic bronze bearing annulus form a complete set is used, its attrition resistance is greater lift and increase what follow actuating pressure. Because of sealing ring of this U form only appropriate at actuating pressure the hydraulic pressure crock with athletic inferior or inferior speed is used. Y form sealing ring. Y form sealing ring is to rely on the labial department that its open to clingy Yu Mi seals the surface and keep sealed, can use alone normally, its sealing can be better, attrition obstruction is lesser, compression performance is good, working stability is good, service life is long. Because sealing ring of this Y form is appropriate,use at the hydraulic pressure crock of high speed transformation, big cylinder diameter, great distance. YX form sealing ring. YX form sealing ring is sectional height and width than be more than 2, and working lip works at be not the lip differs tall Y form sealing ring, its cent uses YX form sealing ring and axis to use YX form sealing ring for aperture, its sealing can be same, outside eliminating all advantages that have Y form sealing ring, when YX form sealing ring is used alone, roll anything but, increased its compression sex and working stability further. The hydraulic pressure crock that because sealing ring of this YX form is special,reachs rapid movement at transformation of high pressure, high speed aptly is used. 3.

2 self-given mode are tight model hydraulic pressure weather strip lip weather strip, like weather strip of hydraulic pressure of form of self-given type impaction, depend on its itself be out of shape taller to generation of sealing contact surface initiative contact stress, prevent without pressure liquid leak. When hydraulic pressure crock works, pressure liquid squashs and maintain its sealed lip ministry, made clingy sealing contact surface and the add contact stress of the along with heighten of pressure liquid pressure heighten with taller generation, prevent pressure liquid leak jointly together with initiative contact stress. The assorted weather strip with hydraulic pressure commonly used crock basically is bud form circle, case comes circle and this seal especially. Bud form is encircled. Bud form circle is the O form sealing ring that pledges by synthetic rubber and clip cloth balata normally the overlay of qualitative Y form sealing ring is used form, as close together as weather strip of self-given type impaction hydraulic pressure and self-given type model hydraulic pressure sealing ring, lip weather strip is same, depend on its itself be out of shape taller to generation of sealing contact surface initiative contact stress, prevent without pressure liquid leak. When hydraulic pressure crock works, pressure liquid is out of shape through the flexibility of O form sealing ring the sealed lip department that squash from beginning to end and supports Y form sealing ring, made clingy sealing contact surface and the add contact stress of the along with heighten of pressure liquid pressure heighten with taller generation, prevent pressure liquid leak jointly together with initiative contact stress. Case will encircle. Case will encircle is the O form sealing ring that pledges by synthetic rubber and fill normally get together the overlay of the quadrate sealing ring with 4 fluorine qualitative ethylene is used form, it can be divided come for Kong Yongge circle and axis are encircled with case, but its are sealed action is same, those who depend on its itself be out of shape taller to generation of sealing contact surface initiative contact stress, prevent without pressure liquid leak. When hydraulic pressure crock works, pressure liquid is out of shape through the flexibility of O form sealing ring only then sealing ring of square of utmost ground extruding, made clingy sealing contact surface and the add contact stress of the along with heighten of pressure liquid pressure heighten with taller generation, prevent pressure liquid leak jointly together with initiative contact stress. This seal especially. This be being sealed especially is the O form sealing ring that pledges by synthetic rubber and fill normally get together what the sealing ring of one echelon comprises the special appearance rectangle with 4 fluorine qualitative ethylene, datival like encircle, can divide be sealed especially for Kong Yongsi and the axis is used this seal especially, its are sealed action and sealed mechanism are datival like encircle, but it has one-way and sealed effect only. Self-given mode is tight model hydraulic pressure sealing ring: Labial form sealing ring, the area of labial ministry contact of as close together as sealing contact surface joint is lesser, can produce bigger compression to be out of shape, win better sealed action. But wear away easily, its are sealed after wearing away action is reduced significantly, if use O form sealing ring to it overlay is used, when combining weather strip namely, although labial ministry wears away hind, because synthetic rubber pledges O form sealing ring has bigger flexibility, the labial department that it will force labial form sealing ring is clingy sealing contact surface, generation is enough big surface contacts stress, achieve sealed effect, and chafe obstruction is lesser, the job is smooth, be assembled easily again and maintenance. Accordingly, at present full automatic ceramic of machine of brick of hydraulic pressure pressing, daily expense, dish, dish kind wait static the hydraulic pressure weather strip that presses forming machine and middling pressure to note oar, high pressure to note forming machine of oar sanitation pottery and porcelain to apply extensively is assorted weather strip almost, if case comes,the circle is reached this encircle especially etc. O circle (glue of fluorine glue fourth eyeball) with Yu Jing sealed and move sealed double action sealing ring. Have a variety of stuff, be like fourth fine balata, fluorine balata, second third balata, chloroprene rubber, silicon balata, chloric silicon balata. Hardness arrives for A7O for temperature of clear family name of 90 get together ammoniac fat balata, have wonderful wearability and fight push a performance, and attrition force is very small also. O form sealing ring because its production fare is low reach use convenient, be answered extensively to be in all sorts of moving consequently, static sealed circumstance. 4 weather strip are the breed of commonly used balata, characteristic with utility natural balata is given priority to with balata hydrocarbon, contain acid of a few protein, moisture, colophony, saccharide and inorganic salt to wait. Flexibility is big, extend intensity surely tall, fight tear off gender and insulating property admirable, wearability and be able to bear or endure drought sex is good, processability beautiful, easily other material agglutinate, in synthetic rubber of majority of excel of integral performance respect. Defect is to be able to bear or endure oxygen and be able to bear or endure ozone sex is poor, easy ageing is degenerative; Oil resistant and solvent resistance are bad, fight acid-base corrode ability low; Hear resistance is not tall. Use temperature limits: Make an appointment with - 60 ℃ ～ + 80 ℃ . The insulation layer of cable of canal of the tire that make, rubber overshoes, glue, adhesive plaster, wire and jacket and other and current product. Special apply to make twist brace up pedestal of shock absorber of arrester, engine, machine, balata goods of component of one metal suspension, diaphragm, mould pressing. The copolymerization body of butadiene of butadiene styrene rubber and styrene. Function is close to natural balata, it is the general synthetic rubber with the at present biggest crop, its characteristic is wearability, be able to bear or endure ageing and hear resistance exceed natural balata, character is cruder also balata is even. Defect is stretch and inferior, fight bend flinch, fight tear off function poorer; Processability can be poor, especially intensity of tack difference, unripe glue is low. Use temperature limits: Make an appointment with - 50 ℃ ～ + 100 ℃ . Main in order to replaces natural balata to make etc of canal of tire, glue board, glue, rubber overshoes current product. Butadiene rubber is You Ding 2 Xi are aggregate and rubber of become suitable type construction. Flexibility and wearability are admirable, ageing resistance is good, be able to bear or endure microtherm sex is exceedingly good, calorific below dynamic bear amount is small, easily metallic agglutinate. Defect is intensity inferior, fight tear off sexual difference, machine function and tack difference. Use temperature limits: Make an appointment with - 60 ℃ ～ + 100 ℃ . Use with natural balata or butadiene styrene rubber more commonly, basically make tire tread, carriage belt and special cold-resistant product. Balata of different the fifth of the ten Heavenly Stem is by different the fifth of the ten Heavenly Stem 2 Xi monomer is aggregate and rubber of construction of a kind of when become suitable type. Chemical composition, stereo structure and natural balata are similar, function also is close to natural balata very much, reason has those who synthesize natural balata to say. It has the major good point of natural balata, be able to bear or endure because ageing is natural balata, flexibility and puissant a bit lower than natural balata, processability can be poor, cost is higher. Use temperature limits: About - 50 ℃ ～ + replaceable natural balata makes 100 ℃ canal of tire, rubber overshoes, glue, adhesive plaster and other and current product. Nextpage chloroprene rubber is what make monomer latex group by chloroprene and become is polymeric. Chloric atom is contained in element of this kind of balata, compare with photograph of other general rubber so: It is had fight oxygen admirably, fight ozone sex, not combustible, after catching fire can from extinguish, oil resistant, be able to bear or endure solvent, be able to bear or endure soda acid and be able to bear or endure ageing, air-tightness is good wait for an advantage; Performance of its physics machinery is better than natural balata also, reason can use as general rubber, also can use as special type balata. Main drawback is cold-resistant sex poorer, specific gravity is bigger, opposite cost is high, insulating property is bad, add man-hour to be stuck easily boil, easy anxious burn reach easy sticking to mould. In addition, unripe glue stability is poor, save not easily. Use temperature limits: Make an appointment with - 45 ℃ ～ + 100 ℃ . Basically use at making a requirement refuse the cable jacket with ozone, tall ageing resistance and cover of all sorts of lag, protection; Oil resistant, be able to bear or endure the glue canal that chemistry corrodes, adhesive plaster and chemical liner; Flame retardant underground mining uses balata product, and all sorts of mould pressing goods, sealing ring, mat, binder. Butyl balata is different butene is mixed a few different the fifth of the ten Heavenly Stem the copolymerization body of 2 Xi or butadiene. The biggest characteristic is air-tightness good, be able to bear or endure ozone, ageing resistance can be good, hear resistance is taller, long-term job temperature can be under 130 ℃ ; Ability inorganic strong acid (wait like vitriolic, nitric acid) with general and organic dissolvent, suck brace up with damp character good, insulating property is first-rate also. Defect is stretch difference, processability can be poor, vulcanization rate is slow, adhesion sex and oil resistant sex are poor. Use temperature limits: Make an appointment with - 120 ℃ of 40 ℃ ～ . Basically use as the adhesive plaster goods of ageing of carriage belt of liner of equipment of layer of insulation of cable of inner tube, wire, chemical industry and shock-proof goods, heat-resisting, heat-resisting. Fourth eyeball balata is made with propylene eyeball copolymerization by butadiene. Have good oil resistant sex of gender, hear resistance, cold-resistant, compression sex and be able to bear or endure ability in swimming, air-tightness reachs good felt performance, have appropriate wearability, normally use temperature is roughly - 40 ～ + 120 ℃ , can be in the air of 120 ℃ is used medium or for a long time in the oil of 15O ℃ . Become the hydraulic pressure weather strip of aleatoric appearance with metallic mould pressing easily, the hydraulic pressure crock that because this fourth fine balata is optimum,is not more than 32MPa at making actuating pressure uses weather strip. Classics is special design recipe, be able to bear or endure to press the oil that send a gender easily: Wear-resisting can bear rotate speed of mechanical car axes 3000 turn / when the following (right now balata hardness is 70 ° ) . The copolymerization body of butadiene of balata of hydrogenation fourth fine and propylene fine. It gets through the Shuang Jian with all or medium butadiene of NBR of partial hydrogen sulfide. Its characteristic is mechanical intensity and wearability tall, the hear resistance when using oxide cross-linking is better than NBR, other property and fourth fine balata are same. Use temperature limits: Make an appointment with - 30 ℃ ～ + 150 ℃ . Basically use at oil resistant, high temperature resistant sealing article. Second third balata is the copolymerization body of ethylene and propylene, general component is balata of binary second third and balata of third of 3 yuan of second. The characteristic is to fight ozone, be able to bear or endure ultraviolet ray, be able to bear or endure weather sex and ageing resistance are exceedingly good, first what reside general rubber. Insulating property, be able to bear or endure chemical sex, concussion is stretch and very good, acid-proof alkaline, proportion is small, can undertake expensive stuff cooperates. Heat-resisting can amount to 15O ℃ , be able to bear or endure polarity dissolvent one ketone, ester, but do not be able to bear or endure adipose hydrocarbon and balmy hydrocarbon, function of other physics machinery slightly second at natural balata excel butadiene styrene rubber. Defect is tack and each other agglutinant very poor, not easy agglutinate. Use temperature limits: Make an appointment with - 50 ℃ ～ + 150 ℃ . Basically use as carriage belt of canal of glue of wire cable wrapping, vapour, heat-resisting, car uses product of industry of rubber products etc. Silicon balata. Advocate catenary is comprised alternately by silicon oxygen atom, contain on silicon atom organic base round. Be able to bear or endure on any account is lukewarm, be able to bear or endure ozone, insulating property is good. Use temperature - 40 ℃ ～ + 220 ℃ ; Beautiful of oil resistant blame, be able to bear or endure lukewarm, wear-resisting, oil resistant. Special apply to the crankshaft oil seal inside car engine, to oxygen, ozone and sunshine (ultraviolet ray) have fight a gender. Fluorine balata. Child fluorine atomic synthetic rubber is contained in the structure. Normally with the fluorine atomicity of fluorine unit is being contained in copolymer eye expresses, the balata that be like fluorine 23, it is to slant the copolymer that 2 fluorine ethylene is the same as 3 fluorine chloric ethylene. Fluorine balata high temperature resistant, oil resistant, be able to bear or endure chemistry is corroded. Oil resistant, high temperature resistant, be able to bear or endure chemical, still have acid-proof alkaline character. Use temperature - 30 ℃ ～ + 280 ℃ . Apply to the crankshaft oil seal inside jet engine, when compasses oil seal, o annulus reachs sealing ring. Get together ammoniac cruel balata. Get together ammoniac fat is a kind of synthetic rubber with highest tensile strength, compare with balata photograph, it has sex of admirable oil resistant sex, hear resistance, cold-resistant, compression sex and wearability and good mechanical performance, normally use temperature is - 40 ℃ ～ + 80 ℃ , get together the normal temperature sealing of ammoniac cruel balata can be more advantageous than Ding Qing balata, it is particularly appropriate use weather strip at making middling pressure, high pressure and jar of extrahigh voltage hydraulic pressure. Reason is medium, oil cylinder of high-pressured hydraulic pressure most the sealed material that often chooses (low pressure can choose) of Ding Jing glue, especially service life is longer, a lot of occasions that use balata oil seal formerly convert get together ammoniac fat oil seal. Acrylic cruel balata is the polymer of acrylic second cruel or acrylic fourth vinegar. Its characteristic is to hold function of good heat-resisting, oil resistant concurrently, in the lubricating oil that contains sulfur, phosphor, chloric additive neuter can be stabilized. Ageing is able to bear or endure in the meantime, be able to bear or endure oxygen and ozone, be able to bear or endure ultraviolet ray, air-tightness is admirable. Defect is cold-resistant sex difference, do not be able to bear or endure water, do not be able to bear or endure vapour and organic with inorganic acerbity, alkaline. Expand inside the water-solubility solution such as vinegar of methanol, glycol, ketone serious. Flexibility and wearability are poor at the same time, insulating property is poor, processability can be poorer. Use temperature limits: Make an appointment with - 25 ℃ ～ + 150 ℃ . Can use at making oil resistant, heat-resisting, be able to bear or endure the goods of ageing, wait like liner of canal of weather strip, glue, chemical industry. Balata of chloric sulphonating polyethylene is polyethylene classics chloridize and sulphonating processing hind, be gotten having stretch polymer. Be able to bear or endure ozone endures ageing closely admirable, be able to bear or endure balata of other of the excel that await a gender. Flame retardant, heat-resisting, solvent resistance and be able to bear or endure most chemical and acid-proof alkaline performance are better. Insulating property is passable, wearability and butadiene styrene rubber are similar. Defect is to fight tear off function difference, processability can be bad. Use temperature limits: Make an appointment with - 20 ℃ ～ + 120 ℃ . Can use the sealed data that makes an ozonizer go up, wrapping of cable of weather strip of production oil resistant, wire and products of oil resistant rubber and chemical liner. Get together sulfur balata is become by the much sulfide condensation polymerization of 2 bittern acting alkyl and alkali metal or alkaline-earth metal. Have exceedingly good oil resistant and solvent resistance, but intensity is not high, ageing resistance, processability is bad, have a stink, use with fourth eyeball balata more. In addition, still have get together ammoniac vinegar balata, chloric mellow balata, acrylic ester balata. The polymer that chloric aether balata all gets together by annulus oxygen chloric propane or becomes by annulus oxygen chloric propane and copolymerization of annulus oxygen ethane. The characteristic is to be able to bear or endure adipose hydrocarbon and chloridize hydrocarbon dissolvent, alkali resistance, be able to bear or endure water, ageing resistance can be wonderful, be able to bear or endure ozone sex. Can use the canal that make gum, weather strip, film and container liner, gasoline tank, rubber roll, production oil seal, water is sealed etc. Chloridize polyethylene balata is polyethylene is passed chloric the has flexibility polymer that replaces reaction to be made. Function and balata of chloric sulphonating polyethylene are adjacent, its characteristic is fluidity good, machine easily; Have be able to bear or endure admirably weather sex, be able to bear or endure ozone sex and be able to bear or endure corona sex, heat-resisting, acid-proof sex of alkaline, oil resistant is good. Defect is stretch difference, compress be out of shape bigger, insulating property is inferior. Use temperature limits: Make an appointment with - 20 ℃ ～ + 120 ℃ . Liner of chemical industry of canal of wire cable jacket, glue, adhesive plaster, rubber roll. Of weather strip of balata of 5 hydraulic pressure choose, when maintaining item to use weather strip in maintenance of choose and buy, the proposal uses following program to raise the accuracy that purchases weather strip: Athletic way: Decide weather strip is in athletic way of the position first, for example move back and forth, rotate, helix or fixed. Sealed key: The piston that deciding mobile drop is the pull rod in internal diameter is sealed or the activity is nodded for example is outer diameter is sealed etc. Temperature grade: From former plant machinery service instruction consults or evaluate working temperature by real work environment, the decision is needed to use data. The specification of concerned temperature grade can consult the manufacturing user note below. Pressure grade: From former plant machinery service instruction consults concerned data, or conclude through observing the soft hardness of former weather strip and structure actuating pressure grade, the specification of concerned pressure grade can consult the manufacturing user note below. Dimension size: Most user can press has used old sample choose and buy, but after weather strip is using period of time, can be reached to wear away by temperature, pressure wait for an element to affect its original measure considerably, the choice that press sample can serve as a reference only, better method is the metallic chamfer dimension of position of location of measurement weather strip, accuracy will be taller. In specific choose weather strip (the) when encircling material like O form, want the consistence of consideration and working medium above all. Still need to consider its integratedly the pressure of sealed place, temperature, consecutive working hours, the working requirement such as cycle of run, if use,rotating circumstance, because attrition heats up the temperature rise that cause,need a consideration, different weather strip material, its physics function and chemical function are different. When axial is installed, want to consider pressure way. When in-house pressure, o form external diameter should compare D3 of groove external diameter about 1 ～ 2% , when outside pressure, should make O form encircles internal diameter to be made an appointment with than D4 of groove internal diameter small 1 ～ 3% . The assembly of oil seal, no matter how the installs partial design and oil seal choice of oil seal is fit, if assemble coarse, also cannot develop the function that oil seal books adequately. When oil seal is installed, outside face should besmear on proper lubricant, the clean grease that labial mouth should suit on besmear, contain the oil seal of dustproof lip, should be in advocate the clean grease that pays the cram between the lip to suit, undertake constructional again. Face towards the end of sealed lip mouth of oil seal sealed medium a side, avoid by all means is assembled reversely. Oil seal loads a Kong Shi, should use special tool to be pushed, prevent the place deflective. The whorl that predestined relationship of oil seal lip passes, keyway, the place such as spline should adopt all sorts of measure to avoid loss of labial predestined relationship, assemble with special tool. Oil seal should the level puts a hole, even pressurization, do not tilt to be advanced compulsively please. The attaint of common and general weather strip has: It is sclerotic (ageing) . Weather strip among them because itself material is affected by temperature,leak reason is sclerotic, when hardness is exorbitant, weather strip cannot fill and cooperate the clearance between the spare parts, can produce leak; 2 it is to wear away. Of weather strip wear away involve the surface that cooperates a spare parts bright and clean degree, athletic speed and transmission media, different sealed material gets used to different athletic speed; 3 it is crowded piece: Had borne when weather strip the meeting when great pressure is squeezed to give metallic clearance, attaint weather strip and generation leak, whether do the hardness that this kind of circumstance involves weather strip itself and metallic clearance pass big, if be on design, type selecting, treatment or installation,handle undeserved, can appear squeeze an attaint; 4 it is to corrode. Showing the case that come is weather strip bate dissolves even, the reason is weather strip is inbreaked by media. The mistake happens when choosing material. If media is hydrous or special attention wants when solvent. Leak is one of breakdown that mechanical equipment often produces. The cause that causes leak basically has two sides: It is the result as a result of machining, the surface of mechanical product is put in all sorts of blemish and appearance and dimension deviation necessarily, because this is in place of connection of mechanical spare parts to be able to produce gap inevitably; 2 it is sealed pressure of two side existence is poor, working medium can pass space and leak. Reduce or eliminating gap is the main avenue that prevents leak. Of vacuum system sealed, outside passing sealing surface leak directly except sealed medium, consider even below form of two kinds of leak: Leakage. Differ action to fall in pressure namely, be called through the capillary leak of weather strip material by sealed medium leakage; Diffuse. Differ action to fall in chroma namely, be delivered to become through the material of the capillary generation of sealed clearance or sealed material by sealed medium diffuse. Sealed action seals the clearance between joint face namely, keep apart or cut off leak passageway, increase the resistance in leak passageway, perhaps add in the passageway set small-sized acting component, create pressure to leak content, offset with the share pressing difference that causes leak or balance completely, in order to prevent leak. The sealed effect of weather strip of hydraulic pressure balata, design besides the structure with seal unit reasonable, the production quality of the function of sealed material and weather strip has outside Shanghaiguan, still match method and outfit to cooperate reason to concern with the outfit of weather strip. The actor bad of sealed effect, having main effect to the reliable job of system of mechanical hydraulic pressure, use correct outfit to match a method to undertake constructional hydraulic pressure equipment, weather strip is damaged not easily, flexibility is good, service life is long, be helpful for improving the quality of the product and sealed performance. CNC Milling CNC Machining