CN102829025B - Jacking hydraulic cylinder in damper - Google Patents
Jacking hydraulic cylinder in damper Download PDFInfo
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- CN102829025B CN102829025B CN201210343901.1A CN201210343901A CN102829025B CN 102829025 B CN102829025 B CN 102829025B CN 201210343901 A CN201210343901 A CN 201210343901A CN 102829025 B CN102829025 B CN 102829025B
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- piston
- cylinder body
- hydraulic jack
- push
- dumping car
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Abstract
The invention discloses a jacking hydraulic cylinder in a damper, relating to a hydraulic cylinder which comprises a cylinder body, a cylinder cover, a piston and a piston rod, wherein the cylinder cover is connected with the top end of the cylinder body, the piston is arranged in the cylinder body, one end of the piston rod is matched with the piston, the other end of the piston rod protrudes out of a through hole in the middle of the cylinder cover and extends to the outer side of the top of the cylinder cover, a part of the inner wall of the cylinder body, which is close to an oil return hole, is provided with an oil return space inclined to a horizontal plane in which an oil return hole is arranged, the piston comprises a metal piston connected with the piston rod and a plastic valve sleeve arranged outside the metal piston and matched with the inner wall of the cylinder body, and the outer wall of the plastic valve sleeve is inwards concavely provided with a piston oil seal groove used for assembling a piston oil seal. The jacking hydraulic cylinder has the advantages of working stability and reliability, long service life, low cost and the like and is easy to maintain.
Description
Technical field
The present invention relates to a kind of hydraulic jack, particularly push up hydraulic jack in a kind of dumping car.
Background technique
To push up hydraulic jack in existing dumping car as shown in Figure 7, comprise hydraulic jack 44, be positioned at the piston of hydraulic jack 44, the lower shaft 46 being fixedly welded on hydraulic jack 44 bottom, the cylinder cap 43 coordinated with hydraulic jack 44 top, the crosshead 41 that is connected with cylinder cap 43 upper end.Hydraulic jack 44 inwall is entire body straight line, bores two holes carry out oil return at hydraulic jack 44 inwall, or bores at hydraulic jack 44 body inwall and a hole, piston bore a hole again carry out oil return, and piston entirety is cast iron or steel matter.Lower shaft 46 is round steel d-axis, and lower shaft two ends are fixedly connected with hinge 45.Crosshead 41 is a d-axis, and in the middle of d-axis, be welded with a piston rod attachment, respectively weld an angle iron on joint both sides, d-axis two ends are fixedly connected with hinge 42.
Push up hydraulic jack in this dumping car and there is following defect: 1, cylinder body of hydraulic oil cylinder inwall is entire body straight line, oil sealing is contained on piston, it is tightr that piston coordinates inside hydraulic jack, oil sealing is squeezed in oil seal groove for a long time, the space of not opening, oil sealing is soon aging, and causing often needs to change oil sealing, change oil sealing to need hydraulic jack to pull down from vehicle bridge, the whole cost of replacing is high, 2, lower shaft is a d-axis, and the hinge at lower shaft two ends is fixedly connected with d-axis, and when overloading wagon, lower shaft ratio is easier to because overstress is bending or fracture, and replacement cost is higher, 3, piston entirety is cast iron or steel matter, and piston easily pulls cylinder body of hydraulic oil cylinder inwall, and cylinder block inner wall abrasion is very fast, and piston itself is also easily pulled, and affects the working life of hydraulic jack, 4, if bore two holes at hydraulic jack inwall to carry out oil return, this circuit can only fill piston ring and can not seal by charge of oil on piston, because piston ring is that its of iron to coordinate with cylinder body of hydraulic oil cylinder inwall and have some little gaps, good voltage regulation performance can not be ensured, if bore a hole at cylinder body of hydraulic oil cylinder inwall, piston bores a hole again and carry out oil return, one pole pair is housed above piston hole, and it carries out oil sealing and oil return work, charge of oil envelope on this circuit piston, but this oil return method, the hole sent out on bar and piston coordinates still certain gap, good oil sealing and voltage stabilizing can not be carried out, and a bar easily bends or comes off, cause send out bar can not oil sealing and cause hydraulic jack lost efficacy cannot work, 5, be fixedly connected with hinge at the d-axis two ends of crosshead, cannot repair after hinge wearing and tearing, can only integral replacing, replacement cost is high.
Summary of the invention
The object of this invention is to provide in the dumping car that a kind of working stability is reliable, long service life, easy-maintaining, cost are low and push up hydraulic jack.
The technological scheme that the present invention adopts for achieving the above object is: push up hydraulic jack in a kind of dumping car, comprise cylinder body, cylinder cap, piston, piston rod, cylinder cap is connected with cylinder body top, piston is arranged in cylinder body, piston rod one end coordinates the other end through hole given prominence in the middle part of cylinder cap to extend to cylinder cap top outer with piston, the contiguous spill port position of described inboard wall of cylinder block is outwards provided with and to the oil return space of return opening place horizontal plane, described piston comprises the metallic piston that is connected with piston rod and is arranged on the outer plastics valve pocket coordinated with inboard wall of cylinder block of metallic piston, plastics valve pocket outer wall caves inward the piston oil sealing groove be provided with for assembling piston oil seal.
Further technological scheme of the present invention is: described oil return space comprises the upper oil return space and lower oil return space that are extended to form respectively to outer incline by the inboard wall of cylinder block of return opening the upper side and lower side, by inboard wall of cylinder block on the upside of return opening downwards and stretch out and formed, lower oil return space is extended to form upwardly and outwardly by inboard wall of cylinder block on the downside of return opening in upper oil return space.
Of the present invention again further technological scheme be: described oil return space be by return opening on the downside of inboard wall of cylinder block extend to form upwardly and outwardly.
Further technological scheme more of the present invention is: the round platform top docking formation that described metallic piston monnolithic case is identical just as two structures, its middle little two ends are large and middle part is provided with the piston hole run through, and described plastics valve pocket is coated on metallic piston other position except upper and lower surface.
Further technological scheme of the present invention is: push up hydraulic jack in described dumping car and also comprise the bottom connecting base being connected to cylinder body bottom, bottom connecting base comprises lower shaft in bridge arch shape, is connected to the crossbeam I between bridge arch shape lower shaft bottom and is movably connected in the hinge I of lower shaft two ends in bottom position hinging hole, and cylinder base is connected with the upside of bridge arch shape lower shaft.
Further technological scheme of the present invention is: the cross section at described hinge I two ends is circular and cross section, stage casing between two ends is triangle, cross section is the hinging hole that triangular sections hinge I is positioned at lower shaft, and cross section is the hinging hole two ends of the hinge I outstanding lower shaft respectively of circle segments.
Further technological scheme of the present invention is: push up hydraulic jack in described dumping car and also comprise the top connecting base being positioned at and being fixedly connected with the piston rod part outside outstanding cylinder cap above cylinder cap, and top connecting base comprises crosshead in bridge arch shape, is connected on the crossbeam II between the end of the bridge arch saltire crown and is movably connected in the hinge II of bridge arch saltire head two ends in tip position hinging hole.
Further technological scheme of the present invention is: the cross section at described hinge II two ends is circular and cross section, stage casing between two ends is triangle, cross section is the hinging hole that triangular sections hinge II is arranged in crosshead, and cross section is the hinging hole two ends of the hinge II outstanding crosshead respectively of circle segments.
Further technological scheme of the present invention is: described inboard wall of cylinder block is provided with outward-dipping oil sealing Free up Memory from top to bottom by bottom position.
Push up hydraulic jack in dumping car of the present invention and there is following beneficial effect:
1, pushing up hydraulic jack in dumping car of the present invention due to the contiguous spill port position of inboard wall of cylinder block is outwards provided with and to the oil return space of return opening place horizontal plane, when piston upwards is to automatic oil return during oil return spatial position, in oil return process, piston does not touch spill port, oil sealing can not be scraped rotten when piston return, do not hole not use on piston and send out bar, can not from leakage of oil piston, make middle top hydraulic jack can keep stable holding power for a long time when lorry lifting, therefore the design in oil return space makes middle top hydraulic jack can easily oil return ensure that piston oil seal is not easily scraped rotten, effectively increase the service life, make the voltage stabilizing of middle top hydraulic jack reach best simultaneously,
2, push up hydraulic jack in dumping car of the present invention change into by metallic piston due to piston and be arranged on the built-up piston that the plastics valve pocket outside metallic piston forms, in the middle of metallic piston, little two ends are large, when lifting boxcar, piston both can resist the immense pressure from lorry, also inboard wall of cylinder block can not be pulled when piston moves up and down in cylinder body, inboard wall of cylinder block is not easy to wear yet, effectively can extend the working life of cylinder body;
3, hydraulic jack is pushed up in dumping car of the present invention owing to being provided with the bottom connecting base of band bridge arch shape lower shaft, in bottom position hinging hole, hinge I is connected with at bridge arch shape lower shaft two ends, when arch lower shaft pressurized, when just as traditional arch bridge, weight is heavier above, arch bridge is squeezed only can be more and more tighter, and easily can not bend or fracture by pressurized as d-axis, hinge I is movably connected in bridge arch shape lower shaft two ends, hinge I intermediate section cross section is that triangle is not easy to wear, can freely change, easy to maintenance and expense is low;
4, hydraulic jack is pushed up in dumping car of the present invention owing to being provided with the top connecting base of band bridge arch saltire head, in tip position hinging hole, hinge II is connected with at bridge arch saltire head two ends, when arch crosshead pressurized, also can when as traditional arch bridge, above weight be heavier, arch bridge is squeezed only can be more and more tighter, and easily can not bend or fracture by pressurized as d-axis, hinge II is movably connected in bridge arch saltire head two ends, hinge II intermediate section cross section is that triangle is not easy to wear, can freely change, easy to maintenance and expense is low;
5, hydraulic jack is pushed up owing to being provided with outward-dipping oil sealing Free up Memory at inboard wall of cylinder block from top to bottom by bottom position in dumping car of the present invention, when piston return is to cylinder base, piston oil seal freely can open in the oil sealing Free up Memory of cylinder body bottom, piston oil seal can not be in squeezed state for a long time, when middle top hydraulic jack does not work, the opening and closing power of piston oil seal can effectively be discharged, piston oil seal just can be made to keep elasticity for a long time, not easily aging, increase the working life of piston oil seal, effectively can reduce the number of times pushing up hydraulic jack because changing piston oil seal in dismounting, the user cost of hydraulic jack is pushed up in effective reduction.
Be further described pushing up hydraulic jack in dumping car of the present invention below in conjunction with drawings and Examples.
Accompanying drawing explanation
Fig. 1 is the structural representation pushing up hydraulic jack entirety in dumping car of the present invention;
Fig. 2 is the structural representation pushing up cylinder body of hydraulic oil cylinder in dumping car of the present invention;
Fig. 3 is the structural representation pushing up hydraulic cylinder cover in dumping car of the present invention;
Fig. 4 is the structural representation pushing up hydraulic cylinder piston in dumping car of the present invention;
Fig. 5 pushes up cylinder body of hydraulic oil cylinder and inner member structural representation thereof in dumping car of the present invention;
Fig. 6 is the structural representation pushing up hydraulic jack second embodiment cylinder body in dumping car of the present invention;
Fig. 7 is the overall structure schematic diagram pushing up hydraulic jack in prior art dumping car.
Primary component label declaration: 1-top connecting base, 2-crossbeam II, 3-hinge II, 4-crosshead, 5-docking groove, 6-cylinder cap, 7-cylinder body, 8-return tube, 9-oil seal plate, 10-lower shaft, 11-hinge I, 12-crossbeam I, connecting base bottom 13-, 14-oil inlet pipe, 15-piston rod, the upper oil return space of 16-, oil return space under 17-, 18-oil sealing Free up Memory, 19-return opening, the dust-proof ring recess of 20-, 21-cylinder cap inner oil seal groove, 22-cylinder cap outer oil seal groove, 23-piston, 24-metallic piston, 25-leads ring recess, 26-plastics valve pocket, 27-piston oil sealing groove, 28-dust ring, 29-cylinder cap inner oil seal, 30-cylinder cap outer oil seal, 31-guide collar, 32-piston oil seal.
Embodiment
Embodiment one: as shown in Figures 1 to 5, hydraulic jack is pushed up in dumping car of the present invention, comprise cylinder body 7, cylinder cap 6, piston 23, piston rod 15, cylinder cap 6 is connected with cylinder body 7 top, piston 23 is arranged in cylinder body 7, cylinder body 7 is outer is also provided with oil inlet pipe 14 and return tube 8, and piston rod 15 one end coordinates the other end through hole given prominence in the middle part of cylinder cap 6 to extend to cylinder cap 6 top outer with piston 23.The contiguous spill port position of cylinder body 7 inwall is outwards provided with and to the oil return space of return opening 19 place horizontal plane, in the present embodiment, oil return space comprises the upper oil return space 16 and lower oil return space 17 that are extended to form respectively to outer incline by cylinder body 7 inwall of return opening 19 the upper side and lower side, by cylinder body 7 inwall on the upside of return opening 19 downwards and stretch out and formed, lower oil return space 17 is extended to form upwardly and outwardly by cylinder body 7 inwall on the downside of return opening 19 in upper oil return space 16.Outward-dipping oil sealing Free up Memory 18 is provided with from top to bottom by bottom position at cylinder body 7 inwall.Described piston 23 comprises the metallic piston 24 that is connected with piston rod 15 and is arranged on the outer plastics valve pocket 26 coordinated with cylinder body 7 inwall of metallic piston 24, the round platform top docking formation (namely diameter little one end docking is formed) that metallic piston 24 monnolithic case is identical just as two structures, its middle little two ends are large and middle part is provided with the piston hole run through, metallic piston 24 is made by steel to be formed in the present embodiment, plastics valve pocket 26 is coated on metallic piston 24 other position except upper and lower surface, plastics valve pocket 26 outer wall caves inward the piston oil sealing groove 27 be provided with for assembling piston oil seal 32, the guiding ring recess 25 for assembling guide collar 31 is also arranged with on the upside of plastics valve pocket 26 outer wall piston oil sealing groove 27.
Push up hydraulic jack in described dumping car and also comprise the bottom connecting base 13 being connected to cylinder body 7 bottom, bottom connecting base 13 comprises lower shaft 10 in bridge arch shape, is connected to the crossbeam I 12 between bridge arch shape lower shaft 10 bottom and is movably connected in the hinge I 11 of lower shaft 10 two ends in bottom position hinging hole, is connected bottom cylinder body 7 with the upside of bridge arch shape lower shaft 10.In the present embodiment, the cross section at hinge I 11 two ends is circular and cross section, stage casing between two ends is triangle, and cross section is the hinging hole that triangular sections hinge I 11 is positioned at lower shaft 10, and cross section is the hinging hole two ends of the hinge I 11 outstanding lower shaft 10 respectively of circle segments.
Push up hydraulic jack in described dumping car and also comprise the top connecting base 1 being positioned at and being fixedly connected with piston rod 15 top outside outstanding cylinder cap 6 above cylinder cap 6, top connecting base 1 comprises crosshead 4 in bridge arch shape, is connected on the crossbeam II 2 between bridge arch saltire head 4 top and is movably connected in the hinge II 3 of bridge arch saltire head 4 two ends in tip position hinging hole.In the present embodiment, the cross section at hinge II 3 two ends is circular and cross section, stage casing between two ends is triangle, and cross section is the hinging hole that triangular sections hinge II 3 is arranged in crosshead 4, and cross section is the hinging hole two ends of the hinge II 3 outstanding crosshead 4 respectively of circle segments.
After the guiding ring recess 25 of piston 23 and piston oil sealing groove 27 load onto guide collar 31 and piston oil seal 32 respectively, piston 23 is fixedly connected on piston rod 15 bottom, dust-proof ring recess 20 on cylinder cap 6 through-hole wall and cylinder cap inner oil seal groove 21 assemble dust ring 28 and cylinder cap inner oil seal 29 respectively, cylinder cap 6 loads onto cylinder cap outer oil seal 30 by the cylinder cap outer oil seal groove 22 of Basolateral, install dust ring 28, cylinder cap inner oil seal 29, the cylinder cap 6 of cylinder cap outer oil seal 30 is fixedly connected on cylinder body 7 upper end by bolt and nut, the piston rod 15 top through hole given prominence in the middle part of cylinder cap 6 extends to cylinder cap 6 top outer.Cylinder body 7 is fixedly welded on the upside of bridge arch shape lower shaft 10 by cylinder body 7 by the oil seal plate 9 that is connected to its bottom.The docking groove 5 of bridge arch saltire head 4 bottom end docks with piston rod 15 top, and is locked by bolt and nut (not shown).
When lifting boxcar, piston 23 promotes piston rod 15 and moves upward, because oil can not leak down from piston 23 before oil return, make middle top hydraulic jack can keep stable holding power for a long time when lorry lifting, need oil return piston 23 to move upward piston oil seal 32 is moved between oil return space 16 and lower oil return space 17 namely to realize automatic oil return, when piston 23 is returned to bottom cylinder body 7, piston oil seal 32 resiles in oil sealing Free up Memory 18, the suffered extruding force of release.The middle top hydraulic jack of the present embodiment is comparatively applicable to being applied in big-and-middle-sized dumping car due to working stability.
Embodiment two: be with above-described embodiment difference: be only provided with an oil return space 33 in the present embodiment, oil return space 33 be by return opening on the downside of inboard wall of cylinder block extend to form upwardly and outwardly, as shown in Figure 6, operationally, piston upwards makes piston oil seal move between oil return space and return opening and can realize automatic oil return.Other structure and function identical with embodiment one, at this not at repeated description.Push up hydraulic jack in the present embodiment to be more suitable for being applied in small-sized dumping car.
Above embodiment is only preferred embodiment of the present invention, structure of the present invention is not limited to the form that above-described embodiment is enumerated, as conversion of the present invention: the intermediate section cross section of hinge I, hinge II is not also limited to triangle, also can be other other shape can not rotated relative to hinging hole such as square or rectangular or rhombus.Every any amendment done within the spirit and principles in the present invention, equivalent replacement etc., all should be included within protection scope of the present invention.
Claims (9)
1. push up hydraulic jack in a dumping car, comprise cylinder body (7), cylinder cap (6), piston (23), piston rod (15), cylinder cap (6) is connected with cylinder body (7) top, piston (23) is arranged in cylinder body (7), piston rod (15) one end coordinates with piston (23), the through hole that the other end gives prominence to cylinder cap (6) middle part extends to cylinder cap (6) top outer, it is characterized in that, contiguous return opening (19) position of described cylinder body (7) inwall is outwards provided with and to the oil return space of return opening (19) place horizontal plane, described piston (23) comprises the metallic piston (24) that is connected with piston rod (15) and is arranged on the plastics valve pocket (26) that metallic piston (24) coordinates with cylinder body (7) inwall outward, plastics valve pocket (26) outer wall caves inward the piston oil sealing groove (27) be provided with for assembling piston oil seal (32).
2. push up hydraulic jack in dumping car as claimed in claim 1, it is characterized in that, described oil return space comprises the upper oil return space (16) and lower oil return space (17) that are extended to form respectively to outer incline by cylinder body (7) inwall of return opening (19) the upper side and lower side, by return opening (19) upside cylinder body (7) inwall downwards and stretch out and is formed, lower oil return space (17) is extended to form by cylinder body (7) inwall on the downside of return opening (19) upper oil return space (16) upwardly and outwardly.
3. push up hydraulic jack in dumping car as claimed in claim 1, it is characterized in that, described oil return space is extended to form upwardly and outwardly by cylinder body (7) inwall of return opening (19) downside.
4. push up hydraulic jack in dumping car as claimed in claim 1, it is characterized in that, described metallic piston (24) monnolithic case is docked by the round platform top that two structures are identical and is formed, its middle little two ends are large and middle part is provided with the piston hole run through, and described plastics valve pocket (26) is coated on metallic piston (24) other position except upper and lower surface.
5. push up hydraulic jack in dumping car as claimed in claim 1, it is characterized in that, push up hydraulic jack in described dumping car and also comprise the bottom connecting base (13) being connected to cylinder body (7) bottom, bottom connecting base (13) comprises lower shaft (10) in bridge arch shape, is connected to the crossbeam I (12) between bridge arch shape lower shaft (10) bottom and is movably connected in the hinge I (11) of lower shaft (10) two ends in bottom position hinging hole, and cylinder body (7) bottom is connected with the upside of bridge arch shape lower shaft (10).
6. push up hydraulic jack in dumping car as claimed in claim 5, it is characterized in that, the cross section at described hinge I (11) two ends is circular and cross section, stage casing between two ends is triangle, cross section is the hinging hole that triangular sections hinge I (11) is positioned at lower shaft (10), and cross section is the hinging hole two ends of hinge I (11) the outstanding lower shaft (10) respectively of circle segments.
7. push up hydraulic jack in dumping car as claimed in claim 1, it is characterized in that, push up hydraulic jack in described dumping car also to comprise and be positioned at the top connecting base (1) that is fixedly connected with outstanding cylinder cap (6) piston rod outward (15) top of cylinder cap (6) top, top connecting base (1) comprises crosshead (4) in bridge arch shape, is connected to the crossbeam II (2) between bridge arch saltire head (4) top and is movably connected in the hinge II (3) of bridge arch saltire head (4) two ends in tip position hinging hole.
8. push up hydraulic jack in dumping car as claimed in claim 7, it is characterized in that, the cross section at described hinge II (3) two ends is circular and cross section, stage casing between two ends is triangle, cross section is the hinging hole that triangular sections hinge II (3) is arranged in crosshead (4), and cross section is the hinging hole two ends of hinge II (3) the outstanding crosshead (4) respectively of circle segments.
9. push up hydraulic jack in dumping car as claimed in claim 1, it is characterized in that, described cylinder body (7) inwall is provided with outward-dipping oil sealing Free up Memory (18) from top to bottom by bottom position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210343901.1A CN102829025B (en) | 2012-09-17 | 2012-09-17 | Jacking hydraulic cylinder in damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210343901.1A CN102829025B (en) | 2012-09-17 | 2012-09-17 | Jacking hydraulic cylinder in damper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102829025A CN102829025A (en) | 2012-12-19 |
| CN102829025B true CN102829025B (en) | 2015-02-04 |
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ID=47332274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210343901.1A Expired - Fee Related CN102829025B (en) | 2012-09-17 | 2012-09-17 | Jacking hydraulic cylinder in damper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102829025B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481966B (en) * | 2014-12-30 | 2016-06-22 | 浙江科力车辆控制系统有限公司 | A kind of structure of hydraulic cab trailing type oil cylinder |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4324171A (en) * | 1978-06-16 | 1982-04-13 | Clark Equipment Company | Fluid device and method for making |
| CN2060487U (en) * | 1989-06-07 | 1990-08-15 | 佛山市环卫处 | Cylinder with the unloading structure |
| CN201367036Y (en) * | 2009-03-24 | 2009-12-23 | 王江山 | Double-oil cylinder A-shaped combined lifting and traversing device |
| CN102633204A (en) * | 2012-04-20 | 2012-08-15 | 常熟通润汽车零部件股份有限公司 | Oil cylinder structure of hydraulic jack |
| CN202833417U (en) * | 2012-09-17 | 2013-03-27 | 李文娟 | Jacking hydraulic cylinder in dumper |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62251507A (en) * | 1986-04-21 | 1987-11-02 | Toyota Autom Loom Works Ltd | Hydraulic cylinder |
| JPH09280180A (en) * | 1996-04-16 | 1997-10-28 | Shigeo Takahashi | Oilless type piston for pump, manufacture of the piston, and pump using the piston |
| JP2002295677A (en) * | 2001-03-30 | 2002-10-09 | Kayaba Ind Co Ltd | Structure of piston part |
-
2012
- 2012-09-17 CN CN201210343901.1A patent/CN102829025B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4324171A (en) * | 1978-06-16 | 1982-04-13 | Clark Equipment Company | Fluid device and method for making |
| CN2060487U (en) * | 1989-06-07 | 1990-08-15 | 佛山市环卫处 | Cylinder with the unloading structure |
| CN201367036Y (en) * | 2009-03-24 | 2009-12-23 | 王江山 | Double-oil cylinder A-shaped combined lifting and traversing device |
| CN102633204A (en) * | 2012-04-20 | 2012-08-15 | 常熟通润汽车零部件股份有限公司 | Oil cylinder structure of hydraulic jack |
| CN202833417U (en) * | 2012-09-17 | 2013-03-27 | 李文娟 | Jacking hydraulic cylinder in dumper |
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| Publication number | Publication date |
|---|---|
| CN102829025A (en) | 2012-12-19 |
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Application publication date: 20121219 Assignee: Changde foister hydraulic cylinder Co Ltd Assignor: Li Qiliang|Li Wenjuan Contract record no.: 2015430000095 Denomination of invention: Jacking hydraulic cylinder in damper Granted publication date: 20150204 License type: Exclusive License Record date: 20150708 |
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Granted publication date: 20150204 Termination date: 20160917 |
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