CN103644304A - Lip-shaped labyrinth seal ring with L-shaped metallic framework and U-shaped metallic framework reversely combined - Google Patents
Lip-shaped labyrinth seal ring with L-shaped metallic framework and U-shaped metallic framework reversely combined Download PDFInfo
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- CN103644304A CN103644304A CN201310670851.2A CN201310670851A CN103644304A CN 103644304 A CN103644304 A CN 103644304A CN 201310670851 A CN201310670851 A CN 201310670851A CN 103644304 A CN103644304 A CN 103644304A
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- oil seal
- lip
- seal body
- metal frame
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
- F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a lip-shaped labyrinth seal ring with an L-shaped metallic framework and a U-shaped metallic framework reversely combined. The lip-shaped labyrinth seal ring comprises an inner oil seal body and an outer oil seal body, the inner oil seal body is supported by the reverse L-shaped metallic framework (3) and molded on the reverse L-shaped metallic framework in a vulcanization mode, a double-hook dustproof lip rubber body (2) vertically arranged on a horizontal arm of the reverse L-shaped metallic framework extends downwards, the double-hook dustproof lip rubber body surrounds the back portion of a reverse L-shaped perpendicular arm along the bottom plane of the reverse L-shaped metallic framework, and the double-hook dustproof lip rubber body and the reverse L-shaped perpendicular arm are connected into a whole; the outer oil seal body is supported by the inverted-U-shaped metallic framework (4), a vulcanization molded rubber body extends upwards along a horizontal section of the tail end of the shape of the inverted-U-shaped metallic framework to form a hook-shaped seal lip around an annular spring in an extending mode; the inner oil seal body and the outer oil seal body are independent from each other, the double-hook dustproof lip rubber body vertically arranged on the inner oil seal body is arranged in an inverted-U-shaped cavity of the inverted-U-shaped metallic framework of the outer oil seal body in a matched mode through free rotation of a fore shaft (6), and finally a geometry-shaped whole similar to a labyrinth is formed through combination and connection. The lip-shaped labyrinth seal ring is good in dustproof effect, flexible in rotation, free from blocking and deflection and convenient to replace, and external dirt can not enter the lip-shaped labyrinth seal ring easily.
Description
Technical field
The present invention relates to a kind ofly be mainly used in heavy truck and petroleum drilling and mining industry has protection requirement to running shaft, and the severe needed seal ring of work condition environment.
Background technique
In the prior art, sealing can be divided into static seal and the large class of the motive sealing between relative movement mating face two between relative stationary engagement face, and static seal mainly contains pad sealing, glue sealing and contacts sealing three major types.Motive sealing can be divided into rotary seal and two kinds of fundamental types of reciprocation sealing.Whether the component of doing relative movement by Sealing and its contact, and can be divided into contact seal and noncontact seal.In general, the good airproof performance of contact seal, but limited by fretting wear, be applicable to the occasion that sealing surface linear velocity is lower.The sealing of noncontact seal is poor, is applicable to the occasion of fair speed.In contact seal, by the contact position of Sealing, can be divided into again circumference (radially) sealing and end face (axially) sealing.In motive sealing, there is self sealing compact type sealing (O RunddichtringO, slip ring combined seal ring, special-shaped seal ring etc.), self sealing self-tightening sealing (U-shaped seal ring, combine U-shaped seal ring, V-type combined seal ring, compound lip-type packing, bi-directional combination lip-type packing etc.), oil sealing (rotation outside framework oil seal, High-pressure oil sealing, butter envelope etc.), dust sealing (dust ring, framework dustproof loop).Non-contact motive sealing has labyrinth seal and dynamic seal etc.The former utilizes the throttle effect limit of fluid in gap to leak, and leakage rate is larger, is conventionally used in the not high occasions of sealing requirements such as inter-stage sealing.Noncontact seal, due to not directly contact of sealing surface, starting power is little ", the life-span is long.If design rationally, leakage rate is also not too large.But this class sealing utilizes hydromechanical state of equilibrium and works, if operating condition changes, will cause the fluctuation that leakage rate is very large.At present general oil seal technique, with reference to GB9877, is arranged on the rotation axle head in equipment, is no more than under the condition of 0.03Mpa at pressure reduction, and convection cell and lubricating grease seal, and dustproof effect, can be widely used in various rotary seal occasions.Along with the various different demands of development of sealing technique, the different seal form of pointing to constantly increase.Sealing configuration is specialty more, system more, as mechanical combination seal, teflon and metal frame combination seal, O type circle and polytetrafluoroethylcombination combination sealing etc., form the various informative sealing configurations such as systematize, specialization, standardization, not only can seal, can also bear high pressure more than 28Mpa.But for automobile drive axle sealing, because lip directly contacts running shaft, and dust-proof effect is not good, if there is silt particle to get involved, quickening running shaft wearing and tearing under the running up of running shaft, shorten working life, cause and reprocess cost increasing, axle and seal ring need change simultaneously.Therefore be not suitable for having requirement and reprocessing the assembly demand that cost is large to the assembly of easy detachable not and to the life-span.Labyrinth seal is between rotational parts and retaining element, to have to be permitted the sealing that flexuose cell reduces leakage.Labyrinth seal is not subject to the restriction of rotational speed and temperature, and friction power loss is minimum.There is various ways in labyrinth, has Comb Labyrinth Seals, the labyrinth seal of honeycomb face, ladder-type labyrinth seal, cropping saw labyrinth seal etc.Conventional comb tooth labyrinth seal during sealing gas, with the contactless motive sealing of some mazy type tortuous passageway restrict.Comb tooth labyrinth seal gas, then enters chamber, labyrinth and expands with the high flow velocity throttling narrow slit of flowing through from high pressure side, and the speed energy forming through narrow slit to consume gas flow, so through throttling repeatedly with expand and produce resistance, stops gas to reach sealing to external leakage.Prior art labyrinth seal normally utilizes the principle of groove and groove, the groove cooperatively interacting will be processed on the spacer of body and end cap, between groove and groove, leave very little gap, lubricating oil is difficult for flowing out mechanical labyrinth seal or establishes in rotating shaft the belt sealing tooth that several are arranged in order around, between tooth and tooth, form a series of gap and expansion cavitys of damming, sealed medium produces throttle effect and Drain Resistance when the gap by tortuous labyrinth.Mechanism of Labyrinth Seal is very complicated.Several belt sealings that are arranged in order that around arrange in rotating shaft, space width is generally 5～9mm, sealing tooth is thin, and be with acute angle, crown first weares and teares and disengages, labyrinth seal helical teeth angle and triangle flute profile have certain impact to labyrinth seal flow field and leakage rate, and along with sealing tooth tilt angle alpha is by little increase, leakage rate is descending to be increased again.Tooth intensity is low, exists high dust-proof effect poor, and extraneous dirt is easily invaded.Surface of contact can produce dry grinding phenomenon, after the sealing tooth distortion of going in ring, mutually interferes, and causes rotating dumb, bite and beat, needs to change oil sealing in maintenance process, changes ransaxle.The labyrinth seal of axle side bends because contact can make axle, lax if any thermal expansion missionary society.General labyrinth seal tends to make high-speed rotating machine to produce flow-induced vibration problem, occurs that vibration noise is large, touches the problems such as mill, even can make whole unit lose efficacy when serious.
Summary of the invention
The present invention is directed to the deficiency that prior art exists; a kind of good dustproof effect is provided; extraneous dirt is difficult for invasion; rotate flexibly, bite beat not; it is convenient to change; can protect running shaft, can improve working life again, and can reduce the LU type metal frame of reprocessing cost and oppositely combine lip labyrinth seal.
The technical solution adopted for the present invention to solve the technical problems is: a kind of LU type metal frame oppositely combines lip labyrinth seal, comprise and face inner oil seal body and the outer oil seal body that contacts secure fit with running shaft directly, it is characterized in that: inner oil seal body is usingd reverse L shaped metal frame 3 as supporting, and adopt sulfidization molding on reverse L shaped metal frame 3, wherein be erected at parallel hook solid double hook dust excluder lips 2 rubber body of reverse L shaped metal frame 3 horizontal arms to downward-extension, along reverse L shaped metal frame 3 bottom planes, around reverse L shaped upright arm back, be connected to an integral body; Outer oil seal body is usingd inverted U-shaped metal frame 4 as supporting, and adopt sulfidization molding rubber body to extend upward along the flat section of inverted U-shaped metal frame profile end, form the hook-type seal lip around annular spring, inside and outside oil seal body is separate, inner oil seal body is erect double hook dust excluder lips 2 rubber body and is freely rotatably assorted outside in the inverted U-shaped die cavity of the inverted U-shaped metal frame 4 of oil seal body by fore shaft 6, it is whole that combination is linked to be a similar mazy geometrical shape, and live axle drives the running of inner oil seal body and outer oil seal to form relative rotary motion.
Described reverse L shaped upright arm is shaped with annular oil storage tank 1 on back.
The present invention has following beneficial effect than prior art.
The present invention is by the separate inside and outside oil seal body composite structure of seal ring, avoid lip and directly contacted running shaft, inner oil seal dignity contacts cooperation with live axle, form certain labyrinth form sealing characteristics, stop the relative movement of seal and axle hub and live axle, avoided causing wearing and tearing to extend the working life of its couple.Adopt the common sealing configuration form forming of inside and outside oil seal body, formed Combined frame oil sealing and tied up in same cavity, prevent the combination of the additional seal of extraneous dirt invasion; Life-span is long, and it is convenient to change.Similar mazy two seals is dustproof, and the best located by sealing lip and dust excluder lips reaches high dust-proof effect.The oil storage tank 1 that increase to go in ring improves the lubricated and frictional force of part and ransaxle, and the mode by following process makes skeleton roughness reach 1.6 to improve lip seal, and double hook dust excluder lips 2 increases and seals and dust-proof effects.
Protection live axle.The present invention can not change existing assembly mode, adopts design and installation size to continue to use existing installation dimension; The position contacting with live axle is designed to face directly contact and coordinates, inner oil seal is faced the position of contact ransaxle 11 live axles contacts directly, effectively protects ransaxle 11 damage that is not worn, and has guaranteed that surface of contact does not produce dry grinding phenomenon.The inside and outside independent oil sealing combination adopting, connects in aggregatesly by fore shaft, inner oil seal body can freely rotate along outer oil seal body inboard wall of skeleton, interference mutually, and the rotation drive inner oil seal body by live axle turns round.Operation process fluid and dust are isolated by inside and outside oil seal body in good time, thereby reach sealing and dustproof effect, can not lose sealing function; Because inner oil seal body adopts to face directly with live axle, contact secure fit, can not form direct contact, can not damage live axle, greatly extended the working life of hub bearing, reduce and reprocess cost.
In vehicle maintenance process, only need to change oil sealing, needn't change ransaxle.Greatly extended the working life of hub bearing, reduced and to reprocess cost LU type metal frame and oppositely combine lip labyrinth seal inner oil seal body metal frame 3 and adopt the particular form of sulfidization molding to be connected to an integral body as supporting with rubber; The oil storage tank 1 that increase to go in ring improves the lubricated and frictional force of part and ransaxle, and the mode by following process makes skeleton roughness reach 1.6 to improve lip seal, and double hook dust excluder lips 2 increases and seals and dust-proof effects.
Evidence, fluid produces resistance by labyrinth and makes its flow reduce combined reaction for " labyrinth effect ".Inner oil seal body is smeared lubricating grease 7 and is placed in outer oil seal body and freely falls, and hand rotation is flexible, bite not, and beat not, after fore shaft, still hand rotation is flexible for inner oil seal body, bite not, torque spanner detection moment is at 8-12N.
It is high dustproof that the present invention is applicable to all high rotating speeds, even in the application of field mud, works, and as go-anywhere vehicle live axle,
Ask the revolution part that sealing is very high.
Accompanying drawing explanation
Fig. 1 is that LU type metal frame of the present invention oppositely combines lip labyrinth seal and ransaxle sealing assembly structure cross-sectional schematic.
Fig. 2 is that Fig. 1 LU type metal frame oppositely combines the local enlarged diagram of lip labyrinth seal half section.
Fig. 3 is the inner oil seal structural representation of Fig. 2.
The outer oil seal structural representation of Fig. 4 Fig. 2.
In figure: 1 annular oil storage tank, 2 dust excluder lips, 3 reverse L shaped metal frames, 4 inverted U-shaped metal frames, 5 annular springs, 6 fore shafts, 7 lubricating grease, 8 wheel hubs, 9 bearings, 10LU type metal frame oppositely combines lip labyrinth seal, 11 ransaxles.
Embodiment
In Fig. 1, adopt the common radial rotary axle lip-type packing 10 forming of inside and outside oil seal body, formed combined seal structure form.LU type metal frame oppositely combines lip labyrinth seal outside framework oil seal and ties up in same cavity, the position of live axle contact is designed to face directly contact and coordinates, inner fluid is sealed, by special fixture, pack ransaxle 8 and wheel hub 9 into, ransaxle 11 rotatablely moves and drives inner oil seal rotation, form relative rotary motion with outer oil seal, external dust is isolated.
In Fig. 2, LU type metal frame oppositely combines lip labyrinth seal and comprises: face the inner oil seal body and the outer oil seal body that contact secure fit with running shaft directly.The body of inner oil seal shown in Fig. 3 is usingd reverse L shaped metal frame 3 as supporting, and adopt sulfidization molding on reverse L shaped metal frame 3, wherein be erected at parallel hook solid double hook dust excluder lips 2 rubber body of reverse L shaped metal frame 3 horizontal arms to downward-extension, along reverse L shaped metal frame 3 bottom planes, around reverse L shaped upright arm back, be connected to an integral body, and be shaped with annular oil storage tank 1 on reverse L shaped upright arm back.The body of outer oil seal shown in Fig. 4 is usingd inverted U-shaped metal frame 4 as supporting, and adopts sulfidization molding rubber body to extend upward along the flat section of inverted U-shaped metal frame profile end, forms the hook-type seal lip around annular spring 5.Inside and outside oil seal body is separate, the fore shaft 6 of parallel hook solid double hook dust excluder lips 2 rubber body that inner oil seal body is erected at reverse L shaped metal frame 3 horizontal arms by machining is freely rotatably assorted outside in the inverted U-shaped die cavity of the inverted U-shaped metal frame 4 of oil seal body, and it is whole that combination is linked to be a similar mazy geometrical shape.The hook-type seal lip of outer oil seal body adopts annular spring 5 pressurizations, and annular spring 5 is assemblied in hook-type seal lip.
In the rotary shaft lip seal of the mix proportion of outer oil seal body shown in the body of inner oil seal shown in Fig. 3 and Fig. 4, the triangular ring cavity area and the inner oil seal body double hook dust excluder lips 2 annular space regions that between outer oil seal body hook-type seal lip and the vertical armstand of the reverse L shaped metal frame 3 reverse L of inner oil seal body, form, be filled with lubricating grease 7, inner fluid is sealed in the die cavity of space, labyrinth.Hook-type seal lip and double hook dust excluder lips 2 and separately the coupling gap of skeleton are ± 0.2mm.Inner oil seal body is smeared lubricating grease 7 and is placed in outer oil seal body and freely falls.Live axle drives the running of inner oil seal body, forms relative rotary motion with outer oil seal.Inner oil seal body double hook dust excluder lips 2 is freely rotated along the inverted U-shaped inwall of outer oil seal body skeleton, does not mutually interfere, and the rotation by live axle drives inner oil seal body to turn round, and forms relative rotary motion with outer oil seal, and external dust is isolated.
Claims (6)
1. a LU type metal frame oppositely combines lip labyrinth seal, comprise and face inner oil seal body and the outer oil seal body that contacts secure fit with running shaft directly, it is characterized in that: inner oil seal body is usingd reverse L shaped metal frame (3) as supporting, and adopt sulfidization molding on reverse L shaped metal frame (3), wherein be erected at parallel hook solid double hook dust excluder lips (2) rubber body of reverse L shaped metal frame (3) horizontal arm to downward-extension, along reverse L shaped metal frame (3) bottom plane, around reverse L shaped upright arm back, be connected to an integral body; Outer oil seal body is usingd inverted U-shaped metal frame (4) as supporting, and adopt sulfidization molding rubber body to extend upward along the flat section of inverted U-shaped metal frame profile end, form the hook-type seal lip around annular spring, inside and outside oil seal body is separate, inner oil seal body is erect double hook dust excluder lips (2) rubber body, by fore shaft (6), be freely rotatably assorted outside in the inverted U-shaped die cavity of the inverted U-shaped metal frame of oil seal body (4), it is whole that combination is linked to be a similar mazy geometrical shape, and live axle drives the running of inner oil seal body and outer oil seal to form relative rotary motion.
2. LU type metal frame as claimed in claim 1 oppositely combines lip labyrinth seal, it is characterized in that: described reverse L shaped upright arm is shaped with annular oil storage tank (1) on back.
3. LU type metal frame as claimed in claim 1 oppositely combines lip labyrinth seal, it is characterized in that: the hook-type seal lip of outer oil seal body adopts annular spring (5) pressurization, and annular spring (5) is assemblied in hook-type seal lip.
4. LU type metal frame as claimed in claim 1 oppositely combines lip labyrinth seal, it is characterized in that: the coupling gap of hook-type seal lip and double hook dust excluder lips (2) and separately skeleton is ± 0.2mm.
5. LU type metal frame as claimed in claim 1 oppositely combines lip labyrinth seal, it is characterized in that: inner oil seal body double hook dust excluder lips (2) is freely rotated along the inverted U-shaped inwall of outer oil seal body skeleton, mutual noninterference.
6. LU type metal frame oppositely combines lip labyrinth seal as claimed in any one of claims 1 to 5, wherein, it is characterized in that: in the rotary shaft lip seal of inner oil seal body and outer oil seal body mix proportion, triangular ring district and inner oil seal body double hook dust excluder lips 2 annular space regions that outer oil seal body hook-type seal lip oppositely forms between the vertical armstand of L with the reverse L shaped metal frame of inner oil seal body (3), be filled with lubricating grease (7), inner fluid is sealed in the die cavity of space, labyrinth.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310670851.2A CN103644304A (en) | 2013-12-10 | 2013-12-10 | Lip-shaped labyrinth seal ring with L-shaped metallic framework and U-shaped metallic framework reversely combined |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310670851.2A CN103644304A (en) | 2013-12-10 | 2013-12-10 | Lip-shaped labyrinth seal ring with L-shaped metallic framework and U-shaped metallic framework reversely combined |
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| CN103644304A true CN103644304A (en) | 2014-03-19 |
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| CN201310670851.2A Pending CN103644304A (en) | 2013-12-10 | 2013-12-10 | Lip-shaped labyrinth seal ring with L-shaped metallic framework and U-shaped metallic framework reversely combined |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2517573A (en) * | 2013-06-26 | 2015-02-25 | Aes Eng Ltd | Dynamically non contacting seal |
| CN105221750A (en) * | 2015-11-04 | 2016-01-06 | 重庆天工油封有限公司 | Anti-muddy water oil sealing |
| CN105970560A (en) * | 2016-06-30 | 2016-09-28 | 无锡小天鹅股份有限公司 | Seal ring and detergent putting assembly and roller washing machine with same |
| CN108019518A (en) * | 2016-10-31 | 2018-05-11 | 德纳汽车系统集团有限责任公司 | Reciprocating air cylinder sleeve seal assembly |
| CN109505979A (en) * | 2018-11-23 | 2019-03-22 | 芜湖新兴铸管有限责任公司 | Centrifuge bellmouth sealing device |
| CN109595342A (en) * | 2018-11-21 | 2019-04-09 | 重庆市璧山区瑞通精密压铸有限公司 | A kind of rotary oil seal |
| CN110486473A (en) * | 2019-08-06 | 2019-11-22 | 昆明学院 | A kind of novel rotary rotating shaft lip-type packing |
| CN112606519A (en) * | 2020-12-08 | 2021-04-06 | 安徽信盟装备股份有限公司 | Laminating machine |
| CN112901725A (en) * | 2021-01-08 | 2021-06-04 | 中国煤炭科工集团太原研究院有限公司 | Power cutting head of heavy potassium mining machine for sylvite ores |
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| US6315296B1 (en) * | 1997-09-25 | 2001-11-13 | Transcom, Inc. | Flangeless retrofittable severe duty seal for a shaft |
| CN101765734A (en) * | 2007-06-29 | 2010-06-30 | Snr轴承股份有限公司 | Roller bearing and sealing joint with improved dynamic behaviour |
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| CN202203404U (en) * | 2011-07-12 | 2012-04-25 | 龙口市飞轮汽车配件有限责任公司 | Wheel hub oil seal for loader bridge |
| CN202203407U (en) * | 2011-07-12 | 2012-04-25 | 龙口市飞轮汽车配件有限责任公司 | Axle oil seal |
| CN202381700U (en) * | 2011-11-30 | 2012-08-15 | 青岛开世密封工业有限公司 | Box type oil seal with high-strength dustproof function |
| CN203656199U (en) * | 2013-12-10 | 2014-06-18 | 四川诺成航空橡塑密封有限责任公司 | Combined type lip-shaped labyrinth sealing ring |
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| US6315296B1 (en) * | 1997-09-25 | 2001-11-13 | Transcom, Inc. | Flangeless retrofittable severe duty seal for a shaft |
| CN101765734A (en) * | 2007-06-29 | 2010-06-30 | Snr轴承股份有限公司 | Roller bearing and sealing joint with improved dynamic behaviour |
| CN202203403U (en) * | 2011-07-12 | 2012-04-25 | 龙口市飞轮汽车配件有限责任公司 | Oil seal for wheel edge of engineering machinery |
| CN202203404U (en) * | 2011-07-12 | 2012-04-25 | 龙口市飞轮汽车配件有限责任公司 | Wheel hub oil seal for loader bridge |
| CN202203407U (en) * | 2011-07-12 | 2012-04-25 | 龙口市飞轮汽车配件有限责任公司 | Axle oil seal |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2517573B (en) * | 2013-06-26 | 2016-04-20 | Aes Eng Ltd | Dynamically non contacting seal |
| GB2517573A (en) * | 2013-06-26 | 2015-02-25 | Aes Eng Ltd | Dynamically non contacting seal |
| CN105221750A (en) * | 2015-11-04 | 2016-01-06 | 重庆天工油封有限公司 | Anti-muddy water oil sealing |
| CN105970560A (en) * | 2016-06-30 | 2016-09-28 | 无锡小天鹅股份有限公司 | Seal ring and detergent putting assembly and roller washing machine with same |
| CN105970560B (en) * | 2016-06-30 | 2018-06-19 | 无锡小天鹅股份有限公司 | Sealing ring, washing launch component and with its roller washing machines |
| CN108019518A (en) * | 2016-10-31 | 2018-05-11 | 德纳汽车系统集团有限责任公司 | Reciprocating air cylinder sleeve seal assembly |
| CN109595342A (en) * | 2018-11-21 | 2019-04-09 | 重庆市璧山区瑞通精密压铸有限公司 | A kind of rotary oil seal |
| CN109505979A (en) * | 2018-11-23 | 2019-03-22 | 芜湖新兴铸管有限责任公司 | Centrifuge bellmouth sealing device |
| CN110486473A (en) * | 2019-08-06 | 2019-11-22 | 昆明学院 | A kind of novel rotary rotating shaft lip-type packing |
| CN110486473B (en) * | 2019-08-06 | 2021-03-19 | 昆明学院 | Novel rotary shaft lip-shaped sealing ring |
| CN112606519A (en) * | 2020-12-08 | 2021-04-06 | 安徽信盟装备股份有限公司 | Laminating machine |
| CN112606519B (en) * | 2020-12-08 | 2023-08-04 | 安徽信盟装备股份有限公司 | Laminating machine |
| CN112901725A (en) * | 2021-01-08 | 2021-06-04 | 中国煤炭科工集团太原研究院有限公司 | Power cutting head of heavy potassium mining machine for sylvite ores |
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Application publication date: 20140319 |