CN104728444A - Floating seal ring with composite working face - Google Patents
Floating seal ring with composite working face Download PDFInfo
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- CN104728444A CN104728444A CN201410671721.5A CN201410671721A CN104728444A CN 104728444 A CN104728444 A CN 104728444A CN 201410671721 A CN201410671721 A CN 201410671721A CN 104728444 A CN104728444 A CN 104728444A
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- Prior art keywords
- wear
- working surface
- resistant strip
- sealing ring
- floating sealing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
- Gasket Seals (AREA)
Abstract
The invention provides a floating seal ring with a composite working face. The floating seal ring with the composite working face comprises an upper sealing ring body and a lower sealing ring body which are symmetrical in structure. The sealing ring bodies are made of metal materials, a circle of groove for arranging a sealing ring is formed in the outer side of each sealing ring body, a circle of wear-resistant belt assembling groove is formed in the working face of each sealing ring body, the width 12 of the wear-resistant belt assembling groove is 25%-75% of the total width 11 of the working face, a wear-resistant belt is fixedly assembled in the wear-resistant belt assembling groove, the wear-resistant belt is made of aluminum oxide ceramic materials or other engineering ceramic materials, the friction surface of the wear-resistant belt and the working faces of the sealing ring bodies are located on the same plane, or the friction surface of the wear-resistant belt protrudes out of the working faces of the sealing ring bodies. The floating seal ring with the composite working face can effectively improve the wear resistant degree of the working face, prolong the service life, and is easy to machine and low in production cost.
Description
Technical field
The present invention relates to mechanical field, particularly relate to a kind of compound working surface floating sealing ring for Floating End Face Seal in machinery.
Background technique
Floating sealing ring is applied to Floating End Face Seal, that a kind of consumption is large, the mechanical seal of purposes wide (nearly 1,000,000 of whole nation year requirement amount), as shown in Figure 1, this sealing is installed by two metal Floating End Face Seal rings (abbreviation floating sealing ring) and two " O " type rubber seal and is formed on center shaft.There is wear-resisting, shock-resistant, certain adaptivity, the life-span be long, structure is simple, inexpensive, the features such as convenient are changed in maintenance, are used widely in the sealing configuration of mine, engineering machinery, building machinery, farm machinery, Transport Machinery, deep drilling rig, down-hole mining machinery.Due to Environmental Conditions special of floating sealing ring, therefore it belongs to easily worn part.The mounting point of exposing, the technical ability of Installation and Debugging personnel, ambient temperature, the factors such as the performance of lubricant oil are all to having a direct impact its working life.
Current floating sealing ring generally adopts following technological forming:
Precision casting type, namely High CrMo Alloy Cast Iron adopts the precision casting of dewax shell mould, finished surface hardness HRC65-72, working surface roughness Ra value is 0.2-0.4 μm, bright band Ra value is 0.1 μm, reason recognize life-span 4000-6000h, actual life about 3000-4000h.
Machinery die casting mould, i.e. alloy cast iron die cast, finished product metallographic structure is finer and closely woven, but cost is slightly high, and working surface roughness Ra value is 0.2-0.4 μm, and bright band Ra value is 0.09-0.15 μm, manage recognize life-span 4000-6000h, actual life about 4000-5000h.
Powder metallurgy Forging, namely powder metallurgy powder forms through high temperature forge hot, and working surface roughness Ra value is 0.4 μm, reason recognize life-span 2000-4000h, actual life about 1500-2000h.
Thermal spraying type, namely body material is plain cast iron, the high chrome molybdenum powder that thermal spraying 0.05-0.20mm is thick on working surface, and abrasive machining forms, reason recognize life-span 4000-6000h, actual life about 3000-4000h.This technique saves rare metal, but must by device-restrictive, and productivity is low, and cost is high.
In sum, the floating sealing ring of current existing various molding mode, there is various deficiency and defect in it in working life, performance, productivity, cost etc.
Summary of the invention
Technical problem to be solved by this invention is exactly the deficiency for above-mentioned background technology, provides a kind of compound working surface floating sealing ring, effectively can improve the abrasivity of working surface, increases working life and be easy to processing, low production cost.
For solving the problems of the technologies described above, a kind of compound working surface floating sealing ring provided by the invention, comprise the pair of seal rings body of upper and lower symmetrical configuration, described seal ring body is made up of metallic material, described seal ring body working surface is provided with a circle for laying the groove of seal ring, the working surface of described seal ring body offers a circle wear-resistant strip fitting recess, the width l of described wear-resistant strip fitting recess
2account for working surface overall width l
125% ~ 75%, described wear-resistant strip fitting recess internal fixtion is equipped with a circle wear-resistant strip, described wear-resistant strip adopts alumina ceramic materials or other engineering ceramic material to make, and the rubbing surface of described wear-resistant strip and the working surface of seal ring body are in same plane or comparatively working surface evagination.
In technique scheme, described wear-resistant strip adopts alumina content 75% ~ 99%, former grain size is less than 0.5 ~ 1 μm aluminium oxide ceramics powder or other engineering ceramic material, after dry-pressing formed, blank 1400 ~ 1620 DEG C of high temperature sinterings form.
In technique scheme, described wear-resistant strip blank sintering temperature is 1480 ~ 1550 DEG C.
In technique scheme, the width l of described wear-resistant strip fitting recess
2account for working surface overall width l
125% ~ 50%.
In technique scheme, described wear-resistant strip is bonded in wear-resistant strip fitting recess, or adopts the mode of interference fit to be fixedly connected with.
Compared with prior art, beneficial effect of the present invention is: invention increases the wear-resistant strip that alumina ceramic materials or other engineering ceramic material are made, effectively can improve the wear-resisting property of floating sealing ring, effectively improves the working life of floating sealing ring; Meanwhile, due to alumina ceramic materials or other engineering ceramic material hardness is higher, smoothness is high, therefore, it is possible to effectively improve the smoothness of floating sealing ring working surface, reduce surface friction drag, reduce the heating value in working procedure, improve the sealability of floating sealing ring; Difficulty of processing of the present invention is low, cheap for manufacturing cost, and owing to not containing any rare metal, therefore raw material acquisition difficulty is low, and productivity is high; Density due to pottery only has the half of cast iron, present invention alleviates the weight of floating sealing ring, is conducive to floating to the heart.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing floating sealing ring;
Fig. 2 is the assembly structure schematic diagram of floating sealing ring of the present invention;
Fig. 3 is the structural representation of the embodiment of the present invention 1;
Fig. 4 is the structural representation of the embodiment of the present invention 2;
Fig. 5 is the structural representation of the embodiment of the present invention 3;
Fig. 6 is the structural representation of the embodiment of the present invention 4;
Wherein, 1-seal ring body, 2-seal ring, 3-groove, 4-working surface, 5-wear-resistant strip fitting recess, 6-wear-resistant strip, 7-rubbing surface.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail:
As shown in Figure 2, compound working surface floating sealing ring designed by the present invention comprises the pair of seal rings body 1 of upper and lower symmetrical configuration, described seal ring body 1 is made up of metallic material, and described seal ring body 1 arranged outside has a circle for laying the groove 3 of seal ring 2, and seal ring 2 is arranged in groove.Described seal ring body 1 is generally formed by iron casting, also can adopt the materials such as steel.The working surface 4 of described seal ring body 1 offers a circle wear-resistant strip fitting recess 5, the width l of described wear-resistant strip fitting recess 5
2account for working surface 4 overall width l
125% ~ 75%.Described wear-resistant strip fitting recess 5 internal fixtion is equipped with a circle wear-resistant strip 6, described wear-resistant strip 6 adopts alumina ceramic materials or other engineering ceramic material to make, and the rubbing surface of described wear-resistant strip 67 and the working surface 4 of seal ring body 1 are in same plane or comparatively working surface 4 evagination.
Floating sealing ring this problem short, easy to wear in working life is a great problem of puzzlement those skilled in the art always.For how to improve floating sealing ring working life, increase its durability degree, those skilled in the art is studying always.At present for the problems referred to above, generally have two kinds of directions of improving, the first improves from technique, and another kind is to the modification of working surface material.Technologic improvement mainly utilizes advanced powder metallurgy thermal forging technology or mechanical extrusion process to make floating sealing ring, is improved the overall mechanical properties of floating sealing ring, improves its intensity, hardness and wear-resisting property, thus improve its working life by manufacturing process.Material modification is then on the working surface of floating sealing ring, spray some high chrome molybdenum powder, improves the wear-resisting property of working surface with this, thus improves the working life of floating sealing ring.No matter adopt which kind of mode, those skilled in the art all not consideration inorganic non-metallic material process floating sealing ring working surface.Its core reasons are, the non-metallic material of high hardness, high-wear resistance, generally frangible, easily break, simultaneously its heat-conducting property is generally poor, because it is the key factor affecting wear-resisting property that friction produces high temperature.And meet that hardness is high, rub resistance simultaneously, simultaneously non-friable again and possess the material of certain heat-conducting property, price is very high again, and for this fragile part of floating sealing ring, fancy price means increases user cost exponentially.Consider above-mentioned factor, so make improvements floating sealing ring howsoever, technician generally selects metal material to make floating sealing ring, and the Inorganic Non-metallic Materials such as pottery can not be adopted to process floating sealing ring.And the present inventor is by conceiving cleverly, reasonably solve this technology prejudice of related domain.Inventor arranges wear-resistant strip fitting recess 5 on working surface, the wear-resistant strip 6 that assembling adopts alumina ceramic materials or other engineering ceramic material to make, working surface 4 is made to form a kind of rubbing surface of combined type, the wear-resistant strip 6 adopting alumina ceramic materials or other engineering ceramic material to make is used for friction resistant loss, remaining metal covering is then used for heat conduction, coordinates the float grease seal in outside can play the effect of rationally heat radiation completely simultaneously.Adopt the structure of this composite surface, while taking into account durability degree, effectively can ensure again the needs dispelled the heat that rub, reasonably overcome technology prejudice.In the present invention, the width l2 of described wear-resistant strip fitting recess 5 accounts for 25% ~ 75% of working surface 4 overall width l1, be then fully taken into account above-mentioned technology prejudice.Preferably, the width l of described wear-resistant strip fitting recess 5 is selected
2account for working surface 4 overall width l
125% ~ 50%.
Wear-resistant strip 6 of the present invention preferably adopts aluminium oxide ceramics powder or other engineering ceramic material of alumina content 75% ~ 99%, former grain size 0.5 ~ 1 μm, and after dry-pressing formed, blank 1400 ~ 1620 DEG C of high temperature sinterings are made.Described engineering ceramic material also can select zirconium oxide, the good engineering ceramic material of silicon carbide uniform wearability, and the present invention preferably adopts aluminium oxide engineering ceramic material.Adopt the wear-resistant strip 6 that above-mentioned technique and material obtain, its crystallite microstructure is more excellent, and wear resistance is better.More preferably, can adopt the sintering temperature of 1480 ~ 1550 DEG C, the ceramic abrasive resistance that this temperature range sinters out is optimum.Wear-resistant strip 6 of the present invention preferably adopts mode that is bonding or interference fit to be fixedly assemblied in wear-resistant strip fitting recess 5.Adopt the mode of interference fit to assemble more to be conducive to wear-resistant strip 6 and on working surface, form annular gap with seal ring body 1, increase the gap waterpower frictional force of lubricant oil, prevent from revealing, bore openings number of rings amount can also be made up because of wear-resistant strip 6 engaged position simultaneously and cause the minimizing of quantity.The mode of interference fit is adopted to assemble, its assembly process is as follows: the difference utilizing metal and ceramic performance of expanding with heat and contract with cold, seal ring body 1 is heated, make it expand, then be pressed into wear-resistant strip 6, make the rubbing surface 7 of wear-resistant strip 6 be in same plane with working surface 4 or protrude outside working surface 4, finally cool.For ease of processing and assembling, described wear-resistant strip 6 both ends of the surface outer circumferential edge can arrange 45 ° of chamferings.
The thickness preferably 1.5 ~ 3mm of described wear-resistant strip 6, wear-resistant strip too thick meeting waste material, increase cost, also can have influence on heat radiation, too thin then manufacture difficulty is high, also frangible simultaneously.
In order to reduce axial pressure, impact crisp ceramic end face firmly, preferred described wear-resistant strip 6 is arranged on the exterior rim of working surface 4, and the oil film allowing the pressure oil of endoporus be formed at working surface slows down axial impact force.More preferably, for the wearing and tearing reducing working surface 4 metal covering form the rubbing surface that Grinding grits enters wear-resistant strip 6, the distance that the rubbing surface 7 of described wear-resistant strip 6 protrudes the working surface 4 of seal ring body 1 preferably controls within the scope of 0.1 ~ 0.2mm.And if consideration is dispelled the heat, then preferred described wear-resistant strip 6 is arranged on the inside rim of working surface 4, linear velocity relative when running like this is little, and heating value is little.
Embodiment 1
As shown in Figure 3, the compound working surface floating sealing ring of the present embodiment comprises the pair of seal rings body 1 of upper and lower symmetrical configuration, described seal ring body 1 is made of cast iron, and described seal ring body 1 arranged outside has a circle for laying the groove 3 of seal ring 2, and seal ring 2 is arranged in groove.The working surface 4 of described seal ring body 1 offers a circle wear-resistant strip fitting recess 5, the width l of described wear-resistant strip fitting recess 5
2account for working surface overall width l
175%, described wear-resistant strip fitting recess 5 internal fixtion is equipped with a circle wear-resistant strip 6.Wear-resistant strip fitting recess 5 is opened in working surface 4 inside rim.Described wear-resistant strip 6 adopts the aluminium oxide ceramics powder of alumina content 75%, former grain size 0.5 μm, and after dry-pressing formed, blank 1400 ~ 1450 DEG C of high temperature sinterings are made.The rubbing surface 7 of described wear-resistant strip 6 is in same plane with the working surface 4 of seal ring body 1.Described wear-resistant strip 6 adopts bonding mode to fix.
After testing, the floating sealing ring of the present embodiment can reach more than 8000 hours working life, and property indices all can meet the usage requirement of floating sealing ring.
Embodiment 2
As shown in Figure 4, the compound working surface floating sealing ring of the present embodiment comprises the pair of seal rings body 1 of upper and lower symmetrical configuration, described seal ring body 1 is made of cast iron, and described seal ring body 1 arranged outside has a circle for laying the groove 3 of seal ring 2, and seal ring 2 is arranged in groove.The working surface 4 of described seal ring body 1 offers a circle wear-resistant strip fitting recess 5, the width l of described wear-resistant strip fitting recess 5
2account for working surface overall width l
160%, described wear-resistant strip fitting recess 5 internal fixtion is equipped with a circle wear-resistant strip 6.Wear-resistant strip fitting recess 5 is opened in working surface 4 and locates in the inner part.Described wear-resistant strip 6 adopts the zirconia ceramics powder of zirconia content 80%, former grain size 0.5 μm, and after dry-pressing formed, blank 1480 DEG C of high temperature sinterings are made.The rubbing surface 7 of described wear-resistant strip 6 is in same plane with the working surface 4 of seal ring body 1.Described wear-resistant strip 6 adopts the mode of interference fit to fix.Wear-resistant strip 6 both ends of the surface outer circumferential edge is provided with 45 ° of chamferings.
After testing, the floating sealing ring of the present embodiment can reach more than 9000 hours working life, and property indices all can meet the usage requirement of floating sealing ring.
Embodiment 3
As shown in Figure 5, the compound working surface floating sealing ring of the present embodiment comprises the pair of seal rings body 1 of upper and lower symmetrical configuration, described seal ring body 1 is made of cast iron, and described seal ring body 1 arranged outside has a circle for laying the groove 3 of seal ring 2, and seal ring 2 is arranged in groove.The working surface 4 of described seal ring body 1 offers a circle wear-resistant strip fitting recess 5, the width l of described wear-resistant strip fitting recess 5
2account for working surface overall width l
125%, described wear-resistant strip fitting recess 5 internal fixtion is equipped with a circle wear-resistant strip 6.Wear-resistant strip fitting recess 5 is opened in working surface 4 and locates in the outer part.Described wear-resistant strip 6 adopts the silicon carbide ceramics powder of carborundum content 90%, former grain size 1 μm, and after dry-pressing formed, blank 1550 DEG C of high temperature sinterings are made.The rubbing surface 7 of described wear-resistant strip 6 is in same plane with the working surface 4 of seal ring body 1.Described wear-resistant strip 6 adopts bonding mode to fix.
After testing, the floating sealing ring of the present embodiment can reach more than 8500 hours working life, and property indices all can meet the usage requirement of floating sealing ring.
Embodiment 4
As shown in Figure 6, the compound working surface floating sealing ring of the present embodiment comprises the pair of seal rings body 1 of upper and lower symmetrical configuration, described seal ring body 1 is made of cast iron, and described seal ring body 1 arranged outside has a circle for laying the groove 3 of seal ring 2, and seal ring 2 is arranged in groove.The working surface 4 of described seal ring body 1 offers a circle wear-resistant strip fitting recess 5, the width l of described wear-resistant strip fitting recess 5
2account for working surface overall width l
135%, described wear-resistant strip fitting recess 5 internal fixtion is equipped with a circle wear-resistant strip 6.Wear-resistant strip fitting recess 5 is opened in the inner rim of working surface 4.Described wear-resistant strip 6 adopts the aluminium oxide ceramics powder of alumina content 99%, former grain size 1 μm, and after dry-pressing formed, blank 1580 ~ 1620 DEG C of high temperature sinterings are made.The rubbing surface 7 of described wear-resistant strip 6 protrudes the working surface 4 of seal ring body 1, and protrusion height is in the scope of 0.1 ~ 0.2mm.Described wear-resistant strip 6 adopts bonding mode to fix.Wear-resistant strip 6 both ends of the surface internal circle is provided with 45 ° of chamferings.
After testing, the floating sealing ring of the present embodiment can reach more than 9000 hours working life, and property indices all can meet the usage requirement of floating sealing ring.
Comprehensive above-described embodiment can be found out, compound working surface floating sealing ring of the present invention all can meet the usage requirement of floating sealing ring at property indices while, its working life at least can reach more than 8000 hours.Compare current existing floating sealing ring, the present invention is while low cost, easily processing, and wear-resisting property is excellent and working life is of a specified duration, and compared with existing floating sealing ring, working life extends more than 30%.
Core of the present invention utilizes to arrange wear-resistant strip 6 on floating sealing ring working surface 4; form wear resistance and working life that compound working surface increases floating sealing ring; therefore; protection scope of the present invention is not limited only to above-described embodiment; on the basis of the principle of the invention; any change or distortion utilizing above-mentioned mechanism, all belongs to protection scope of the present invention.
Claims (10)
1. a compound working surface floating sealing ring, comprise the pair of seal rings body (1) of upper and lower symmetrical configuration, described seal ring body (1) is made up of metallic material, described seal ring body (1) working surface is provided with a circle for laying the groove (3) of seal ring (2), it is characterized in that: the working surface (4) of described seal ring body (1) offers a circle wear-resistant strip fitting recess (5), the width l of described wear-resistant strip fitting recess (5)
2account for working surface (4) overall width l
125% ~ 75%, described wear-resistant strip fitting recess (5) internal fixtion is equipped with a circle wear-resistant strip (6), described wear-resistant strip (6) adopts alumina ceramic materials or other engineering ceramic material to make, and the rubbing surface (7) of described wear-resistant strip (6) and the working surface (4) of seal ring body (1) are in same plane or comparatively working surface (4) evagination.
2. compound working surface floating sealing ring according to claim 1, it is characterized in that: described wear-resistant strip (6) adopts alumina content 75% ~ 99%, former grain size is less than 0.5 ~ 1 μm aluminium oxide ceramics powder or other engineering ceramic material, after dry-pressing formed, blank 1400 ~ 1620 DEG C of high temperature sinterings form.
3. compound working surface floating sealing ring according to claim 2, is characterized in that: described wear-resistant strip (6) adopts alumina ceramic materials to make.
4. compound working surface floating sealing ring according to claim 2, is characterized in that: described wear-resistant strip (6) blank sintering temperature is 1480 ~ 1550 DEG C.
5. the compound working surface floating sealing ring according to claim 1 ~ 4 any one, is characterized in that: the width l of described wear-resistant strip fitting recess (5)
2account for working surface (4) overall width l
125% ~ 50%.
6. the compound working surface floating sealing ring according to claim 1 ~ 4 any one, is characterized in that: described wear-resistant strip fitting recess (5) is opened in working surface (4) inner side or outside.
7. the compound working surface floating sealing ring according to claim 1 ~ 4 any one, is characterized in that: described wear-resistant strip (6) thickness is 1.5 ~ 3mm.
8. the compound working surface floating sealing ring according to claim 1 ~ 4 any one, is characterized in that: described wear-resistant strip (6) both ends of the surface inside and outside circle is provided with 45 ° of chamferings.
9. the compound working surface floating sealing ring according to claim 1 ~ 4 any one, is characterized in that: described wear-resistant strip (6) is bonded in wear-resistant strip fitting recess (5).
10. the compound working surface floating sealing ring according to claim 1 ~ 4 any one, is characterized in that: described wear-resistant strip (6) adopts the mode of interference fit to be fixedly connected with wear-resistant strip fitting recess (5).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410671721.5A CN104728444A (en) | 2014-11-21 | 2014-11-21 | Floating seal ring with composite working face |
| PCT/CN2015/095240 WO2016078623A1 (en) | 2014-11-21 | 2015-11-21 | Highly durable floating oil seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410671721.5A CN104728444A (en) | 2014-11-21 | 2014-11-21 | Floating seal ring with composite working face |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104728444A true CN104728444A (en) | 2015-06-24 |
Family
ID=53452635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410671721.5A Pending CN104728444A (en) | 2014-11-21 | 2014-11-21 | Floating seal ring with composite working face |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104728444A (en) |
| WO (1) | WO2016078623A1 (en) |
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| CN105090513A (en) * | 2015-08-12 | 2015-11-25 | 李纯 | Ceramic dispersion strengthening metal abrasion resisting belt and metal stamping ring floating oil seal |
| CN105090514A (en) * | 2015-08-12 | 2015-11-25 | 李纯 | Floating oil seal with ceramic composite abrasion-resistant surfaces and metal stamping ring bodies |
| CN105351529A (en) * | 2015-11-10 | 2016-02-24 | 李纯 | Floating oil seal with oil storage micropore abrasion-resistant faces |
| CN105351530A (en) * | 2015-11-10 | 2016-02-24 | 李纯 | Floating oil seal with narrow-line and narrow-face friction pair |
| CN105387211A (en) * | 2015-11-10 | 2016-03-09 | 李纯 | Floating oil seal with ceramic dispersion strengthening metal wear-resisting belt and metal stamping ring bodies |
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| CN105508609A (en) * | 2015-11-10 | 2016-04-20 | 李纯 | Floating oil seal provided with ceramic-dispersion-strengthened metal wear-resistant belts and engineering plastic ring bodies |
| WO2016078623A1 (en) * | 2014-11-21 | 2016-05-26 | 李纯 | Highly durable floating oil seal |
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