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CN108591472A - A kind of adhering device of oil seal without framework - Google Patents

A kind of adhering device of oil seal without framework Download PDF

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Publication number
CN108591472A
CN108591472A CN201810836406.1A CN201810836406A CN108591472A CN 108591472 A CN108591472 A CN 108591472A CN 201810836406 A CN201810836406 A CN 201810836406A CN 108591472 A CN108591472 A CN 108591472A
Authority
CN
China
Prior art keywords
pressing plate
connector
oil seal
framework
adhering device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201810836406.1A
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Chinese (zh)
Other versions
CN108591472B (en
Inventor
朱晶智
赵海涛
冯健
李强
刘玉锋
贾龙凯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Gearbox Co Ltd
Original Assignee
Chongqing Gearbox Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Gearbox Co Ltd filed Critical Chongqing Gearbox Co Ltd
Priority to CN201810836406.1A priority Critical patent/CN108591472B/en
Publication of CN108591472A publication Critical patent/CN108591472A/en
Application granted granted Critical
Publication of CN108591472B publication Critical patent/CN108591472B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/328Manufacturing methods specially adapted for elastic sealings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Gasket Seals (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

The present invention discloses a kind of oil seal without framework adhering device, including the first connector, second connector, first pressing plate, second pressing plate, third pressing plate and the 4th pressing plate, first pressing plate is connected with the second pressing plate by the first connector, third pressing plate is connected with the 4th pressing plate by the first connector, first pressing plate is connected by the second connector with the 4th pressing plate and is reserved with the gap of operation between the two, second pressing plate is connected by second connector with third pressing plate and is reserved with the gap of operation between the two, the width in the gap to be adjusted when adjusting the second connector pretightning force.Oil seal without framework adhering device provided by the invention, for oil seal without framework design feature, design specialized cutting, adhering device, in cutting process, cutting reference plane is provided so that cutting stability higher, quality of cut face is more preferable, in oil sealing bonding process, two side guide of oil sealing is not removed, ensures oil sealing cutting, consistency and stability in bonding process.

Description

A kind of adhering device of oil seal without framework
Technical field
The present invention relates to mechanical structure technical field of sealing technology, more particularly to a kind of oil seal without framework adhering device.
Background technology
Typical Representative of the oil seal without framework as oil sealing is widely used in engine crankshaft, gearbox, differential mechanism, subtracts The mechanical transmission fields such as device are shaken, there are two types of mounting means is general, monoblock type and are cut adhered.According to the close of oil seal without framework Principle is sealed, oil sealing is installed for surface quality, and dimensional accuracy is especially very high to the required precision of lip position.
Existing cutting for sealing joint strip, bonding tool currently on the market, it is ensured that the sealing under inoperative environment Item cutting, adhesive reinforcement, but since oil seal without framework and conventional seals adhesive tape are in sealing principle, contour structures, material, installation Required precision, use occasion etc. are different, the cutting tool of sealing joint strip be not particularly suited for the cutting of oil seal without framework with it is bonding. Existing sealing strip bonding tool can only operate in the larger environment in smooth, space, cannot working condition (i.e. sealing surface, In seal chamber) operation, practicability is not high, and is not suitable for oil seal without framework, due to the use environment and structure of oil seal without framework Particularity, still without for oil seal without framework specific purpose tool.
Therefore, how a kind of special cutting suitable for oil seal without framework, bonding tool are provided, is those skilled in the art Technical problem urgently to be resolved hurrily.
Invention content
The object of the present invention is to provide a kind of oil seal without framework adhering devices, can be applicable in large-scale oil seal without framework knot Structure, applied widely, cutting performance is good, and bonding reliability is high.
In order to solve the above technical problems, the present invention provides a kind of oil seal without framework adhering device, including the first connector, the Two connectors, the first pressing plate, the second pressing plate, third pressing plate and the 4th pressing plate, first pressing plate pass through with second pressing plate First connector is connected, and the third pressing plate is connected with the 4th pressing plate by first connector, and described first Pressing plate is connected by second connector with the 4th pressing plate and is reserved with the gap of operation between the two, and described second Pressing plate is connected by second connector with the third pressing plate and is reserved with the gap of operation between the two, to adjust The width in the gap is adjusted when the second connector pretightning force.
Preferably, bottom and the edge of first pressing plate, second pressing plate, the third pressing plate and the 4th pressing plate Length direction opens up notch, to form the card slot for clamping oil seal without framework to be processed.
Preferably, further include the first positioning pin, first positioning pin is through second pressing plate, and described first is fixed The end of position pin is located in first pressing plate, and first pressing plate and second pressing plate are carried out located lateral.
Preferably, further include the second positioning pin, second positioning pin is through the third pressing plate, and described second is fixed The end of position pin is located in the 4th pressing plate, and the third pressing plate and the 4th pressing plate are carried out located lateral.
Preferably, further include the first guide pin, first through hole along its length, institute are offered on the 4th pressing plate The one end for stating the first guide pin is set in first pressing plate, and one end of first guide pin is slidably disposed in institute It states in first through hole.
Preferably, further include the second guide pin, the second through-hole along its length, institute are offered on the third pressing plate The one end for stating the second guide pin is set in second pressing plate, and one end of second guide pin is slidably disposed in institute It states in the second through-hole.
Preferably, first connector and second connector are connection bolt.
Preferably, further include the first washer being set on first connector.
Preferably, further include the second packing ring being set on second connector.
Oil seal without framework adhering device provided by the present invention includes mainly the first connector, the second connector, the first pressure Plate, the second pressing plate, third pressing plate and the 4th pressing plate, the first pressing plate are connected with the second pressing plate by the first connector, third pressing plate It is connected by the first connector with the 4th pressing plate, the first pressing plate is connected with the 4th pressing plate by the second connector and pre- between the two There are the gap of operation, the second pressing plate is connected by second connector with third pressing plate and is reserved with operation between the two Gap, the width in the gap to be adjusted when adjusting the second connector pretightning force.Exoskeletal oil provided by the invention Adhering device is sealed, for oil seal without framework design feature, design specialized cutting, adhering device, structure size matching degree higher is glued Connect precision higher;List covering device is applicable to different size, various forms of oil seal without framework bonding, and use scope is wide, utilizes Rate is high;In oil sealing cutting, bonding process, two side guide of oil sealing is not removed, is ensured consistent in oil sealing cutting, bonding process Property and stability;In cutting process, cutting reference plane is provided so that cutting stability higher, quality of cut face are more preferable.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of overall structure diagram of specific implementation mode provided by the present invention;
Fig. 2 is Section A-A view shown in Fig. 1;
Fig. 3 is section B-B view shown in Fig. 1.
Wherein, in Fig. 1-Fig. 3:
First positioning pin -1, oil seal without framework -2, the first washer -3, the first connector -4, the second connector, second Washer -6, the first pressing plate -7, the second pressing plate -8, the first guide pin -9, four pressing plate -11, the second of third pressing plate -10, the Positioning pin -12, the second guide pin -13, first through hole -1101, the second through-hole -1001.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
It please refers to Fig.1, the overall structure signal that Fig. 2 and Fig. 3, Fig. 1 are a kind of specific implementation mode provided by the present invention Figure;Fig. 2 is Section A-A view shown in Fig. 1;Fig. 3 is section B-B view shown in Fig. 1.
In a kind of specific implementation mode provided by the present invention, oil seal without framework adhering device includes mainly the first connection Part 4, the second connector 5, the first pressing plate 7, the second pressing plate 8, third pressing plate 10 and the 4th pressing plate 11, the first pressing plate 7 and second pressure Plate 8 is connected by the first connector 4, and third pressing plate 10 is connected with the 4th pressing plate 11 by the first connector 4, the first pressing plate 7 and 4th pressing plate 11 is connected by the second connector 5 and is reserved with the gap of operation, the second pressing plate 8 and third pressing plate between the two 10 are connected by the second connector 5 and are reserved between the two the gap of operation, with when adjusting the second 5 pretightning force of connector The width in adjustable gap.
Wherein, the first pressing plate 7 is connected with the second pressing plate 8 by the first connector 4, and third pressing plate 10 and the 4th pressing plate 11 are logical It crosses the first connector 4 to be connected, the first pressing plate 7 is connected by the second connector 5 with the 4th pressing plate 11 and is reserved with work between the two The gap of industry, the second pressing plate 8 are connected by the second connector 5 with third pressing plate 10 and are reserved with the seam of operation between the two Gap, the width in gap to be adjusted when adjusting the second 5 pretightning force of connector.
Specifically, in actual cutting, bonding process, the spring of oil seal without framework 2 is removed first, chooses exoskeletal oil The first pressing plate 7 and the second pressing plate 8 are installed in the side for sealing 2 cut surfaces respectively, by the first positioning pin 1 by the first pressing plate 7 and Then two pressing plates, 8 located lateral tightens the first pressing plate 7 and the second pressing plate 8, until not by the first connector 4 and the first washer 3 Oil seal without framework 2 is set to be deformed;Third pressing plate 10 and the 4th pressing plate 11 are installed in yet another side respectively, pass through the second positioning pin 12 by 11 located lateral of third pressing plate 10 and the 4th pressing plate, then tightens third pressure by second packing ring 3 and the first connector 4 Plate 10 and the 4th pressing plate 11, until being deformed oil seal without framework 2, you can the cut surface for completing oil seal without framework 2 is fixed Work.
It should be noted that the cut surface of oil seal without framework 2 is fixed after completing, the first connector 4 is respectively positioned on cut surface Above upper surface, the leakproofness of oil seal without framework 2 is not interfered with;It should also be noted that, the first pressing plate 7, the second pressing plate 8, the Three pressing plates 10 and 11 model of the 4th pressing plate are preferably sized to identical, it is ensured that cutting operation it is accurate, raising is cut It cuts, bonding quality;In addition, fixing oil seal without framework in the first pressing plate 7, the second pressing plate 8, third pressing plate 10 and the 4th pressing plate 11 After 2, the fixation outer profile of formation is the rectangle or square of rule, it is ensured that cutting, bonding it is accurate, improve cutting, Bonding quality.
It should also be noted that, a set of oil sealing adhering device is applicable to the oil seal without framework 2 of sizes specification, together When, it can meet cutting and the bonding of complete series oil seal without framework 2 by designing more set adhering devices, wherein the first washer 3, First connector 4, the second connector 5, second packing ring 6 are not limited to according to oil sealing type, the difference of oil sealing size and use environment Type of attachment shown in above-described embodiment, it is possible to use the diversified forms such as aerofoil profile bolt, slotted screw.
Then, it is close to a side guide end face, from inside to outside in the gap that both sides Anchor plate kit is formed using sharp cutter Uniformly cutting oil sealing, you can completing the cutting work to oil seal without framework 2 can check and cut after the completion of oil seal without framework 2 is cut Whether face is smooth bright and clean, and oil sealing is fixed on installation region together with both sides tool prepares bonding.
It is finally the cut surface bonding work of oil seal without framework 2, first will be used between the first pressing plate 7 and the 4th pressing plate 11 9 longitudinal register of guide pin will use 13 longitudinal register of the second guide pin, be cut in oil sealing between the second pressing plate 8 and third pressing plate 10 Face uniformly smears suitable amount of adhesive, later by the second connector 5 and second packing ring 6 by the first pressing plate 7 and the 4th pressing plate 11, the second pressing plate 8 is screwed to oil seal without framework 2 with third pressing plate 10 and is not deformed, and is required to second according still further to related process Connector 5 applies the pretightning force of stipulated time, until oil sealing is bonded the secured dismountable tooling in rear, completes oil seal without framework 2 and cuts The bonding work in face.Oil seal without framework adhering device provided by the invention, for oil seal without framework design feature, design specialized is cut It cuts, adhering device, structure size matching degree higher, adhesive reinforcement higher;List covering device is applicable to different size, different form Oil seal without framework bonding, use scope is wide, and utilization rate is high;In oil sealing cutting, bonding process, two side guide of oil sealing is not torn open It removes, ensures oil sealing cutting, consistency and stability in bonding process;In cutting process, cutting reference plane is provided so that cut Stability higher is cut, quality of cut face is more preferable.
In order to optimize the advantages of oil seal without framework adhering device in above-described embodiment can ensure to cut stability higher, the One pressing plate 7, the second pressing plate 8, third pressing plate 10 and the 4th pressing plate 11 bottom and open up notch along its length, to form use In the card slot of clamping oil seal without framework 2 to be processed.First pressing plate 7, the second pressing plate 8, third pressing plate 10 and the 4th pressing plate 11 In processing, oil sealing fixing groove is separately machined, can be directed to the oil seal without framework 2 of different size model, right before cutting oil sealing The installation of first pressing plate 7, the second pressing plate 8, third pressing plate 10 and the 4th pressing plate 11, need to ensure oil sealing cycle surface and fixing groove It reclines, ensures the oil sealing accurate positioning after cutting.
Further, oil seal without framework adhering device further includes the first positioning pin 1, and the first positioning pin 1 is pressed through second Plate 8, and the end of the first positioning pin 1 is located in the first pressing plate 7, and the first pressing plate 7 and the second pressing plate 8 are carried out located lateral; Oil seal without framework adhering device further includes the second positioning pin 12, and the second positioning pin 12 is through third pressing plate 10, and second positions The end of pin 12 is located in the 4th pressing plate 11, and third pressing plate 10 and the 4th pressing plate 11 are carried out located lateral.First positioning pin 1 And second positioning pin 12 setting, the first pressing plate 7 and the second pressing plate 8, third pressing plate 10 and the 4th pressing plate 11 can tightened Pressing plate is positioned before, ensure that the upper surface of the first pressing plate 7 and the second pressing plate 8 is generally aligned in the same plane in, the first pressing plate 7 and the In two pressing plates, 8 lower face is generally aligned in the same plane, the first pressing plate 7 and 8 left side of the second pressing plate are generally aligned in the same plane interior, the first pressing plate 7 and in 8 right side of the second pressing plate is generally aligned in the same plane, it ensure that the precision of cut surface so that cutting stability higher, cutting Face better quality.
Further, oil seal without framework adhering device further includes the first guide pin 9, is offered on the 4th pressing plate 11 along its length The first through hole 1101 in direction is spent, one end of the first guide pin 9 is set in the first pressing plate 7, and one end of the first guide pin 9 can It is slidingly arranged in first through hole 1101;Oil seal without framework adhering device further includes the second guide pin 13, on third pressing plate 10 The second through-hole 1001 along its length is offered, one end of the second guide pin 13 is set in the second pressing plate 8, and second leads It is slidably disposed in the second through-hole 1001 to one end of pin 13.The setting of first guide pin 9 and the second guide pin 13, can By first through hole 1101 by the first pressing plate 7 and 11 longitudinal register of the 4th pressing plate, by the second through-hole 1001 by the second pressing plate 8 with 10 longitudinal register of third pressing plate can make above-mentioned cut surface contraposition more accurate, can be set according to different bonding agent corresponding viscous Time and bonding force are connect, without holding by hand, avoiding the occurrence of shake and being bonded the situation of time deficiency, bonding reliability higher.
Further, the first connector 4 and the second connector 5 are connection bolt.Certainly can also be other connectors, Being subject to can stablize, accurately tighten pressing plate, be not specifically limited herein.
Further, the first connector 4 is provided with the first washer 3 with pressing plate contact surface;Second connector 5 is contacted with pressing plate Face is provided with second packing ring 6.The design of first washer 3 and second packing ring 6, it is ensured that when cutting oil sealing, oil sealing itself Vibration smaller, ensure that the precision of cut surface so that cutting stability higher, quality of cut face is more preferable.
In conclusion the oil seal without framework adhering device that the present embodiment is provided includes mainly the first connector, the second company Fitting, the first pressing plate, the second pressing plate, third pressing plate and the 4th pressing plate, the first pressing plate pass through the first connector phase with the second pressing plate Even, third pressing plate is connected with the 4th pressing plate by the first connector, and the first pressing plate is connected with the 4th pressing plate by the second connector And it is reserved with the gap of operation between the two, the second pressing plate is connected with third pressing plate by the second connector and pre- between the two There are the gaps of operation, the width in gap to be adjusted when adjusting the second connector pretightning force.Bone free provided by the invention Frame oil sealing adhering device, for oil seal without framework design feature, design specialized cutting, adhering device, structure size matching degree is more Height, adhesive reinforcement higher;List covering device is applicable to different size, various forms of oil seal without framework bonding, and use scope is wide, Utilization rate is high;In oil sealing cutting, bonding process, two side guide of oil sealing is not removed, is ensured in oil sealing cutting, bonding process Consistency and stability;In cutting process, cutting reference plane is provided so that cutting stability higher, quality of cut face are more preferable.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest range caused.

Claims (9)

1. a kind of oil seal without framework adhering device, which is characterized in that including the first connector (4), the second connector (5), first Pressing plate (7), the second pressing plate (8), third pressing plate (10) and the 4th pressing plate (11), first pressing plate (7) and second pressing plate (8) it is connected by first connector (4), the third pressing plate (10) connects with the 4th pressing plate (11) by described first Fitting (4) is connected, and first pressing plate (7) is connected by second connector (5) with the 4th pressing plate (11) and the two Between be reserved with the gap of operation, second pressing plate (8) passes through second connector (5) with the third pressing plate (10) It is connected and is reserved between the two the gap of operation, it is described to be adjusted when adjusting the second connector (5) pretightning force The width in gap.
2. oil seal without framework adhering device according to claim 1, which is characterized in that first pressing plate (7), described Two pressing plates (8), the third pressing plate (10) and the 4th pressing plate (11) bottom and open up notch along its length, with shape At the card slot of the oil seal without framework (2) to be processed for clamping.
3. oil seal without framework adhering device according to claim 2, which is characterized in that further include the first positioning pin (1), institute The first positioning pin (1) is stated through second pressing plate (8), and the end of first positioning pin (1) is located at described first and presses In plate (7), first pressing plate (7) and second pressing plate (8) are subjected to located lateral.
4. oil seal without framework adhering device according to claim 3, which is characterized in that further include the second positioning pin (12), Second positioning pin (12) is through the third pressing plate (10), and the end of second positioning pin (12) is located at described the In four pressing plates (11), the third pressing plate (10) and the 4th pressing plate (11) are subjected to located lateral.
5. oil seal without framework adhering device according to claim 2, which is characterized in that further include the first guide pin (9), institute The first through hole (1101) offered on the 4th pressing plate (11) along its length is stated, one end of first guide pin (9) is set It is placed in first pressing plate (7), and one end of first guide pin (9) is slidably disposed in the first through hole (1101) in.
6. oil seal without framework adhering device according to claim 5, which is characterized in that further include the second guide pin (13), The second through-hole (1001) along its length, one end of second guide pin (13) are offered on the third pressing plate (10) It is set in second pressing plate (8), and one end of second guide pin (13) is slidably disposed in second through-hole (1001) in.
7. the oil seal without framework adhering device according to claim 4 or 6, which is characterized in that first connector (4) and Second connector (5) is connection bolt.
8. oil seal without framework adhering device according to claim 7, which is characterized in that further include being set to described first to connect The first washer (3) on fitting (4).
9. oil seal without framework adhering device according to claim 8, which is characterized in that further include being set to described second to connect Second packing ring (6) on fitting (5).
CN201810836406.1A 2018-07-26 2018-07-26 Bonding device of frameless oil seal Active CN108591472B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201810836406.1A CN108591472B (en) 2018-07-26 2018-07-26 Bonding device of frameless oil seal

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CN108591472A true CN108591472A (en) 2018-09-28
CN108591472B CN108591472B (en) 2024-11-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112145525A (en) * 2020-09-23 2020-12-29 重庆齿轮箱有限责任公司 Auxiliary device for bonding split sealing ring and bonding method

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CN2931047Y (en) * 2006-05-31 2007-08-08 重庆海通机械制造有限公司 Granite ultra-thin plate skiver
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CN204868103U (en) * 2015-07-04 2015-12-16 宁波敏实汽车零部件技术研发有限公司 Strip workpiece cutting device and crooked mould in C shape cross -section
CN106863205A (en) * 2017-03-14 2017-06-20 杭州前进齿轮箱集团股份有限公司 A kind of wind-powered electricity generation main-gear box sealing ring more changing device
CN208503478U (en) * 2018-07-26 2019-02-15 重庆齿轮箱有限责任公司 A kind of adhering device of oil seal without framework

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Publication number Priority date Publication date Assignee Title
DE3012387A1 (en) * 1980-03-29 1981-10-08 Continental Gummi-Werke Ag, 3000 Hannover Rubber sealing strips butt-jointed - by vulcanising transverse disc between them
CN2580211Y (en) * 2002-10-31 2003-10-15 天津市天锻压力机有限公司 Adhesive device for large hydraulic press oil cylinder sealing ring
CN2931047Y (en) * 2006-05-31 2007-08-08 重庆海通机械制造有限公司 Granite ultra-thin plate skiver
CN201848946U (en) * 2010-09-04 2011-06-01 湖北诺克橡塑密封科技有限公司 Automobile sealing strip connector butting mould
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CN208503478U (en) * 2018-07-26 2019-02-15 重庆齿轮箱有限责任公司 A kind of adhering device of oil seal without framework

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112145525A (en) * 2020-09-23 2020-12-29 重庆齿轮箱有限责任公司 Auxiliary device for bonding split sealing ring and bonding method

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