CN201071856Y - Reinforcing oil cylinder - Google Patents
Reinforcing oil cylinder Download PDFInfo
- Publication number
- CN201071856Y CN201071856Y CNU2007201699339U CN200720169933U CN201071856Y CN 201071856 Y CN201071856 Y CN 201071856Y CN U2007201699339 U CNU2007201699339 U CN U2007201699339U CN 200720169933 U CN200720169933 U CN 200720169933U CN 201071856 Y CN201071856 Y CN 201071856Y
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- bar
- oil pocket
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Abstract
The utility model provides a force-increasing cylinder, which comprises a cylinder block with a sealed end and a first piston component which reciprocates in axial direction in the cylinder. The first piston component includes a first piston rod and a first piston fixed on one end of the first piston rod. The first piston divides the cylinder block into a first main oil cavity and a second main oil cavity which is connected with the sealed end of the cylinder block. The first piston rod is barrel-shaped with one closed end, in which the second piston component reciprocating in axial direction against the first piston component is coaxially arranged. The second piston component includes a second piston rod and a second piston which is integrated with the second piston rod sleeved with the first piston. The second piston divides the inner part of the first piston rod into a first auxiliary oil cavity and a second auxiliary oil cavity which is connected with the closed end of the first piston rod. The utility model can significantly improve the thrust force output by the cylinder without changing the outline dimension of the cylinder and the hydraulic system pressure.
Description
Technical field
The utility model relates to a kind of hydrodynamic pressure actuating device, particularly a kind ofly does the fluid actuator that linear reciprocation moves by the hydrodynamic pressure push mechanism.
Background technique
The structure of the oil hydraulic cylinder that generally uses in the prior art is at present: comprise cylinder body, a piston assembly that moves back and forth is set in the cylinder body, comprise piston rod and the piston that is fixedly mounted on the piston rod, piston will be separated into former and later two chambers in the cylinder body, when rear chamber's oil-feed, when front chamber is fuel-displaced, the promotion piston forward moves, thereby promotes piston rod reach, thrust output; When front chamber's oil-feed and rear chamber when fuel-displaced promotes piston to move backward, be withdrawn in the rigid body thereby promote piston rod.
The problem that this structure exists is the restriction that the thrust of oil hydraulic cylinder output is subjected to hydraulic system pressure, for example under the certain prerequisite of hydraulic system pressure, in order to improve the thrust of oil hydraulic cylinder output, then must increase the work area of piston, promptly increase piston diameter, thereby increased the physical dimension of piston and oil cylinder, cause manufacture cost to improve, use inconvenience, and bring difficulty for transportation and construction; On the other hand, if do not change the physical dimension of oil cylinder, then need the oil pump that adopts pressure higher in order to improve pressure, cause cost of production to improve equally, in addition owing to adopt high-pressure service pump, the pressure of hydraulic system improves, and causes the existing sealing of oil hydraulic cylinder to be easy to reveal, and therefore sealing configuration has been proposed requirements at the higher level.
The model utility content
The purpose of this utility model provides a kind of boosting oil cylinder, make constant in oil cylinder boundary dimension and situation that hydraulic system pressure is constant under, can significantly improve the thrust of oil cylinder output.
For realizing the utility model purpose, the utility model provides a kind of boosting oil cylinder on the one hand, cylinder body, and the sealing of one end, the other end is fixed with first guide sleeve; Be arranged on the first piston assembly in the cylinder body, comprise along first guide sleeve first piston bar that axially moves back and forth and the first piston that is fixed on first piston bar one end, first piston has into separately with being separated in the cylinder body, the first main oil pocket of oil outlet and the second main oil pocket, the second main oil pocket is in abutting connection with sealing one end of cylinder body, the first piston bar is the tubular of end sealing, also have: second piston assembly that relative first piston assembly axially moves back and forth, it is placed in the internal cavities of first piston bar, comprise second piston rod and with its all-in-one-piece second piston, second upper cover of piston rod dress first piston, second piston is separated into the first secondary oil pocket and the second secondary oil pocket with the internal cavities of first piston bar, and the second secondary oil pocket is in abutting connection with the closed end of first piston bar.
Particularly, the first main oil pocket is communicated with the first secondary oil pocket, the second main oil pocket is communicated with the second secondary oil pocket, can realize being communicated with of the first main oil pocket and the first secondary oil pocket by the first oil transportation road that runs through first piston bar bar wall, and the connection of the second oil transportation road, the second main oil pocket and the second secondary oil pocket by running through second piston rod.
Particularly, first piston comprises interfix all-in-one-piece piston portion and guide portion, wherein piston portion contacts with inboard wall of cylinder block and can endwisely slip along the inwall of cylinder body, guide portion embeds piston portion inside, and first piston is enclosed within on second piston rod by guide portion and the edge can endwisely slip by second piston rod.
Wherein, the first piston bar comprises interfix all-in-one-piece first piston bar main part and formation first piston rod seal joint end and that stretch to the cylinder body outside, and wherein main part is consistent with the joint excircle dimension.
On the other hand, the utility model provides a kind of boosting oil cylinder, and it comprises cylinder body and first piston member, wherein cylinder body one end sealing, and the other end is provided with first guide sleeve; The first piston member that in cylinder body, moves back and forth, have bar portion and piston portion, piston region is the end near the cylinder body sealed end in bar portion, its both sides vertically form to have into separately, oil outlet, the first main oil pocket and the second main oil pocket, it is characterized in that: bar portion and piston portion are hollow cylindrical, and bar portion is away from the end sealing of cylinder body sealed end, also comprise: second piston component, have the second piston component bar portion and be positioned at the second piston component piston portion of the second piston component bar portion near an end of first piston member bar portion closed end, be arranged in the first piston member and also can move back and forth, first piston piece piston portion is enclosed within the second piston component bar portion, form certain interval between second piston component bar portion's outer surface and the first piston member bar portion internal surface, make the second piston component piston portion both sides vertically form respectively first secondary oil pocket that is communicated with the first main oil pocket and the second secondary oil pocket that is communicated with the second main oil pocket.
Particularly the first main oil pocket is communicated with by the first oil transportation road that runs through the bar wall setting of first piston member bar portion with the first secondary oil pocket; The second main oil pocket and the second secondary oil pocket are communicated with by the second oil transportation road that passes the second piston component bar portion.
Particularly, first piston piece piston portion comprises piston branch and is positioned at the guiding branch of piston branch inside, wherein piston branch contacts with inboard wall of cylinder block and can endwisely slip along the inwall of cylinder body so that realize moving back and forth of first piston member, and guiding branch is enclosed within the second piston component bar portion and along the second piston component bar portion and endwisely slips so that realize moving back and forth of second piston component.
Having the following advantages of the utility model boosting oil cylinder:
Owing to set up one group of new piston assembly or member in the inside of original one group of piston assembly or member, increase the lifting surface area of first piston assembly by new piston assembly, its lifting surface area is substantially equal to big piston area and small piston area sum, therefore do not changing under the oil hydraulic cylinder boundary dimension situation identical with hydraulic system pressure, can significantly improve the thrust of oil hydraulic cylinder, avoid increasing for the thrust that improves oil hydraulic cylinder output causes cylinder sizes by the output of first piston assembly, manufacture cost improves, use is inconvenient and bring difficult problem for transportation and construction.
Brief Description Of Drawings
Fig. 1 is the longitudinal sectional view of the utility model boosting oil cylinder, and wherein the big piston bar is positioned at cylinder interior;
Fig. 2 is that the utility model boosting oil cylinder is arranged on the scheme of installation in the force-bearing disk squeezing and expanding machine.
Description of reference numerals: 1, big piston bar; 2, big guide sleeve; 3, small piston; 4, small piston rod; 5, cylinder body; 6, little guide sleeve; 7, big piston ante-chamber; 8, big piston back cavity; 9, small piston ante-chamber; 10, the first oil transportation road; 11, small piston back cavity; 12, big piston bar main part; 13, the second oil transportation road; First segmentation in 13a, the second oil transportation road; Second segmentation in 13b, the second oil transportation road; 14, big piston; 15, cylinder cap; 16, big piston bar joint; 17, the turnover oilhole of big piston back cavity; 18, the turnover oilhole of big piston ante-chamber; 20, boosting oil cylinder; 21, pressure head; 22, slide block; 23, bearing pin; 24, fuselage; 25, first bow pressing arm; 26, second bow pressing arm.
Embodiment
Below with reference to specific embodiment the utility model is described in detail.
As shown in Figure 1, Fig. 1 is the longitudinal sectional view of the utility model boosting oil cylinder.Boosting oil cylinder comprises circle tube cylinder 5, cylinder body 5 has two ends respect to one another vertically, wherein an end is by integrally welded and by cylinder cap 15 sealings with cylinder cap 5, the other end is provided with it fixedly big guide sleeve 2 of all-in-one-piece, and O ring back-up ring a4 and O-ring seals a5 are set between the outer surface of big guide sleeve 2 and cylinder body 5 internal surfaces.
Be provided with in the cylinder body 5 and its coaxial substantially big piston bar 1, big piston bar 1 comprises big piston bar main part 12 and joint 16, and big piston bar main part 12 is the cylindrical shape that inside has cylindrical cavity.Be provided with in the cavity of big piston bar main part 12 and its coaxial substantially cylindrical small piston rod 4.Have a determining deviation between the outer surface of big piston bar main part 12 and the internal surface of cylinder body 5, make to form axial cylindrical cavity between cylinder body 5 and the big piston main part 12; Have a determining deviation between the internal surface of big piston bar main part 12 and the internal surface of small piston rod 4, make to form axial cylindrical cavity between big piston bar main part 12 and the small piston rod 4.
Big piston bar main part 12 has the first relative vertically end and second end, wherein, fixedly connected between the joint 16 of first end and big piston bar 12, for example by being welded to connect, and the external diameter of joint 16 is identical with the external diameter of big piston bar main part 12, thereby form the big piston bar 1 of one, big guide sleeve 2 inside set gradually the piston rod of polyurethane material vertically with the support ring a2 of sealing a1, polyformaldehyde material, this special envelope a3 of polyurethane material, make to form sealing between big piston bar 1 outer surface and big guide sleeve 2 internal surfaces; The big piston 14 that the second end setting is fixedlyed connected with it, big piston 14 whole cylindrical structures, big piston 14 can be fixed by welding in second end of big piston bar main part 12, the external diameter of big piston 14 equates with the internal diameter of cylinder body 5, and can in cylinder body, move back and forth so that drive big piston bar 1 and move back and forth, seal ring a16 and guidance tape a17 are set between the internal surface of the outer surface of big piston 14 and cylinder body 5, and sealing circle a16 can adopt the Ge Laiquan that is made by polyurethane material.
Fixedly form big piston back cavity 8 between the cylinder cap 15 of the same side of all-in-one-piece big piston 14 and little guide sleeve 6 and closed cylinder 5 one ends; The inboard of the opposite side of big piston 14 and big guide sleeve 2 can be referred to as big piston ante-chamber 7 with the cylindrical cavity 7 that the cavity that forms between cylinder body 5 internal surfaces and big piston bar main part 12 outer surfaces seals; The cylindrical cavity 9 that the opposite side of little guide sleeve 6 and a side of small piston 3 are sealed the space between big piston bar main part 12 internal surfaces and small piston rod 4 outer surfaces can be referred to as small piston ante-chamber 9; The cylindrical cavity that forms between the inboard of small piston 3 opposite sides and joint 16 is called small piston back cavity 11.
Near the position of big piston 14 the first oil transportation road 10 is set on the bar wall of big piston bar main part 12, is communicated with by the first oil transportation road 10 between big piston ante-chamber 7 and the small piston ante-chamber 9.
The working procedure of the utility model boosting oil cylinder is described below.
Again referring to Fig. 1, when oil cylinder is in state shown in Figure 1, when switching to, the selector valve of oil cylinder makes oil-feed in the big piston back cavity 8 and the fuel-displaced working position of big piston plug ante-chamber 7, then oil-feed in the big piston back cavity 8, big piston ante-chamber 7 and the small piston ante-chamber 9 that is communicated with big piston ante-chamber 7 by the first oil transportation road 10 are fuel-displaced, piston portion by promoting all-in-one-piece big piston 14 and little guide sleeve 6 respectively along cylinder body 5 internal surfaces and small piston rod 4 outer surfaces towards (promptly away from the direction of cylinder cap 15, towards illustrated left) endwisely slip, promote big piston bar 1 thus (promptly vertically towards the axial outside of cylinder body, towards illustrated left) also do moving away from cylinder cap 15, oil in the big piston back cavity 8 is by the second oil transportation road 13a simultaneously, 13b enters small piston back cavity 11, make and promote 11 oil-feeds of small piston back cavity big piston bar 1 by the joint 16 that promotes big piston bar 1 thus and move forward vertically.
This shows that under the constant situation of oil pressure, the utility model has increased the thrust that the big piston bar is exported by increasing the active area (prior art be the big piston area only, and the utility model comprises big piston area and small piston area) of piston.Promptly, big piston 14 by making big piston bar main part 12 second ends and little guide sleeve 6 and the joint 16 that is positioned at its first end are subjected to forward the thrust of (illustrated left) simultaneously, make big piston bar 1 under the effect of double reaction plus, move forward and stretch out cylinder body, finally move to position shown in Figure 2, make oil hydraulic cylinder thus under the constant situation of oil hydraulic cylinder boundary dimension and system pressure, realized the effect of reinforcement.
When promoting big piston bar 1,8 oil-feeds of big piston back cavity move forward to when being in the limit position that stretches out outside the cylinder body, withdraw in cylinder body 5 in order to make big piston bar 1, the selector valve of oil cylinder switched to make 7 oil-feeds of big piston ante-chamber and the fuel-displaced working position of big piston back cavity 8, big piston ante-chamber 7 and small piston ante-chamber 9 oil-feeds that are communicated with by the first oil transportation road 10 with big piston ante-chamber 7, big piston back cavity 8 and simultaneously by the second oil transportation road 13a, the small piston back cavity 11 that 13b is communicated with big piston back cavity 8 is fuel-displaced, the piston portion and the little guide sleeve 6 that promote all-in-one-piece big piston 14 thus endwisely slip towards cylinder cap 15 along cylinder body 5 internal surfaces and small piston rod 4 outer surfaces respectively, promotion big piston bar 1 moves vertically and is withdrawn into cylinder body 5 inside, finally gets back to position shown in Figure 1.
Although the driven medium that above-mentioned the utility model boosting oil cylinder adopts can be pressure oil, it will be appreciated by those skilled in the art that driven medium also can adopt pressurized air.
Fig. 2 is that boosting oil cylinder of the present utility model is installed in the structural representation in the force-bearing disk squeezing and expanding machine, and the working procedure of the utility model boosting oil cylinder is described with reference to Fig. 2.
Force-bearing disk squeezing and expanding machine comprises fuselage 24, builder and is fixed on fuselage 24 right-hand members and to the boosting oil cylinder 20 of builder applied thrust.
Builder is placed in fuselage 24 inside of extruding-extending machine, comprise the two symmetrical groups bow pressing arm vertically is set, every group of bow pressing arm comprises first pressure arm 25 and second bow pressing arm 26 of the mutual hinge of an end, the other end of first bow pressing arm 25 and pressure head 21 hinges, the other end of second bow pressing arm 26 is fixed in the left end of fuselage 24.When extruding-extending machine is not worked, first, second bow pressing arm 25,26 be in regain in the fuselage 24 the position, shown in solid line among Fig. 2.
During construction, at first in foundation soil body, get out a hole by drilling equipment, then with force-bearing disk squeezing and expanding machine (left end down, right-hand member is in a last hole of vertically putting into.When by oil pump when big piston back cavity 8 and small piston back cavity 11 are pressed into oil, big piston ante-chamber 7 and small piston ante-chamber 9 are fuel-displaced, first piston bar 1 is in big piston back cavity 8 and small piston back cavity 11 under the oil pressure acting in conjunction, vertically move down, thereby promote two groups of first, second bow pressing arms 25,26 to the outside extrusion of fuselage, be in the position shown in Fig. 2 dotted line, thereby the sidepiece in the plumb pile hole forms load dish slotted eye.In the foundation soil body of stake hole sidepiece, form after the load dish slotted eye, to switch to by selector valve and to make oil pump to big piston ante-chamber 7 fuel feeding, 7 oil-feeds of big piston ante-chamber, first oil transportation road 10 oil-feeds of small piston ante-chamber 9 by communicating with big piston ante-chamber 7, big piston back cavity 8 and by the second oil transportation road 13a, the small piston back cavity 11 that 13b communicates with big piston back cavity 8 is fuel-displaced, make first piston bar 1 in big piston ante-chamber 7 and small piston ante-chamber 9 under the oil pressure acting in conjunction thus, vertically move up, thereby promote two group first, second bow pressing arm 25,26 are recovered to the fuselage inside and outside, finally get back to the position shown in Fig. 2 solid line.
Claims (10)
1. a boosting oil cylinder has
Cylinder body (5), the sealing of one end, the other end is fixed with first guide sleeve (2);
Be arranged on the first piston assembly in the cylinder body (5), comprise the first piston bar (1) and the first piston (14) that axially move back and forth along first guide sleeve (2), first piston (14) will be separated into the first main oil pocket (7) and the second main oil pocket (8) that has separately into and out of oilhole (18,17) in the cylinder body (5), the second main oil pocket (8) is in abutting connection with sealing one end of cylinder body, it is characterized in that: the first piston bar is the tubular of end sealing, also has:
Second piston assembly (3,4) that relative first piston assembly (1,14) axially moves back and forth, be placed in the internal cavities of first piston bar (1), comprise second piston rod (4) and second piston (3), second piston rod (4) is gone up the described first piston of suit (14), second piston (3) is separated into the first secondary oil pocket (9) and the second secondary oil pocket (11) with the internal cavities of first piston bar (1), and the second secondary oil pocket (11) is in abutting connection with the closed end of described first piston bar (1).
2. boosting oil cylinder as claimed in claim 1 is characterized in that:
The described first main oil pocket (7) is communicated with the described first secondary oil pocket (9), and the described second main oil pocket (8) is communicated with the second secondary oil pocket (11).
3. boosting oil cylinder as claimed in claim 1 or 2 is characterized in that:
The described first main oil pocket (7) is communicated with by the first oil transportation road (10) that runs through the setting of described first piston bar (12) bar wall with the described first secondary oil pocket (9); The described second main oil pocket (8) and the described second secondary oil pocket (11) are communicated with by the second oil transportation road (13a, 13) that runs through described second piston rod (4).
4. boosting oil cylinder as claimed in claim 1 or 2, it is characterized in that: described first piston (14) comprises interfix all-in-one-piece piston portion and guide portion (6), wherein said piston portion contacts with cylinder body (5) inwall and can endwisely slip along the inwall of cylinder body (5), described guide portion (6) embeds piston portion inside, and described first piston (14) is sleeved on second piston rod (4) by described guide portion (6) and upward and along described second piston rod (4) endwisely slips.
5. boosting oil cylinder as claimed in claim 3, it is characterized in that: described first piston (14) comprises interfix all-in-one-piece piston portion and guide portion (6), wherein said piston portion contacts with cylinder body (5) inwall and can endwisely slip along the inwall of cylinder body (5), described guide portion (6) embeds piston portion inside, and described first piston (14) is sleeved on described second piston rod (4) by described guide portion (6) and goes up also and can endwisely slip along described second piston rod (4).
6. boosting oil cylinder as claimed in claim 1 or 2 is characterized in that: described first piston bar (1) comprises first piston bar main part (12) and forms the joint (16) of described first piston bar (1) closed end.
7. boosting oil cylinder as claimed in claim 3 is characterized in that: described first piston bar (1) comprises first piston bar main part (12) and forms the joint (16) of described first piston bar (1) closed end.
8. a boosting oil cylinder has
Cylinder body (5), the sealing of one end, the other end is provided with first guide sleeve (2);
The first piston member (1) that can in cylinder body (5), move back and forth, have bar portion (1) and piston portion (14), piston portion (14) is positioned at the end of bar portion (1) near the cylinder body sealed end, its both sides vertically form the first main oil pocket (7) and the second main oil pocket (8) that has separately into and out of hydraulic fluid port (18,17), it is characterized in that:
Described bar portion (4) and piston portion (14) are tubular, and described bar portion (4) also comprises away from the end sealing of cylinder body sealed end:
Second piston component (4), have the second piston component bar portion (4) and be positioned at the second piston component piston portion (3) of the second piston component bar portion (4) near an end of first piston member bar portion (4) closed end, being arranged on interior also relative its of first piston member (1) reciprocatingly moves, first piston piece piston portion (14) is enclosed within the second piston component bar portion (4), and second piston component piston portion (3) both sides vertically form first secondary oil pocket (9) that is communicated with the first main oil pocket and the second secondary oil pocket (11) that is communicated with the second main oil pocket respectively.
9. boosting oil cylinder as claimed in claim 8 is characterized in that: the described first main oil pocket (7) is communicated with by the first oil transportation road (10) that runs through described first piston member bar portion (12) bar wall setting with the described first secondary oil pocket (9); The described second main oil pocket (8) and the described second secondary oil pocket (11) are communicated with by the second oil transportation road (13a, 13b) that passes the described second piston component bar portion (4).
10. boosting oil cylinder as claimed in claim 8 or 9, it is characterized in that: described first piston piece piston portion (14) comprises piston branch and is positioned at the guiding branch (6) of piston branch inside, wherein said piston branch contacts with cylinder body (5) inwall and can endwisely slip along the inwall of cylinder body (5) so that realizes moving back and forth of first piston member, and described guiding branch (6) is enclosed within the second piston component bar portion (4) and along the described second piston component bar portion (4) and endwisely slips so that realize moving back and forth of described second piston component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201699339U CN201071856Y (en) | 2007-07-27 | 2007-07-27 | Reinforcing oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201699339U CN201071856Y (en) | 2007-07-27 | 2007-07-27 | Reinforcing oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201071856Y true CN201071856Y (en) | 2008-06-11 |
Family
ID=39550414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201699339U Expired - Lifetime CN201071856Y (en) | 2007-07-27 | 2007-07-27 | Reinforcing oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201071856Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762967A (en) * | 2016-11-25 | 2017-05-31 | 大唐贵州野马寨发电有限公司 | A kind of double reinforcement hydraulic cylinder |
| CN107387486A (en) * | 2017-08-01 | 2017-11-24 | 宁波斯达弗液压传动有限公司 | A kind of integrated hydraulic control cylinder |
| CN109570374A (en) * | 2019-01-10 | 2019-04-05 | 浙江鹤立智能机械有限公司 | Multiple hydraulic transfer press |
| CN109799133A (en) * | 2019-01-08 | 2019-05-24 | 煤炭科学技术研究院有限公司 | A kind of compound reinforcement load cylinder |
| CN110454461A (en) * | 2019-08-29 | 2019-11-15 | 江苏恒立液压股份有限公司 | Piston component and elevating ram with it |
-
2007
- 2007-07-27 CN CNU2007201699339U patent/CN201071856Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762967A (en) * | 2016-11-25 | 2017-05-31 | 大唐贵州野马寨发电有限公司 | A kind of double reinforcement hydraulic cylinder |
| CN107387486A (en) * | 2017-08-01 | 2017-11-24 | 宁波斯达弗液压传动有限公司 | A kind of integrated hydraulic control cylinder |
| CN107387486B (en) * | 2017-08-01 | 2023-11-14 | 宁波斯达弗液压传动有限公司 | Integrated hydraulic control oil cylinder |
| CN109799133A (en) * | 2019-01-08 | 2019-05-24 | 煤炭科学技术研究院有限公司 | A kind of compound reinforcement load cylinder |
| CN109570374A (en) * | 2019-01-10 | 2019-04-05 | 浙江鹤立智能机械有限公司 | Multiple hydraulic transfer press |
| CN109570374B (en) * | 2019-01-10 | 2024-02-09 | 浙江鹤立智能机械有限公司 | Multi-station hydraulic press |
| CN110454461A (en) * | 2019-08-29 | 2019-11-15 | 江苏恒立液压股份有限公司 | Piston component and elevating ram with it |
| CN110454461B (en) * | 2019-08-29 | 2023-12-19 | 江苏恒立液压股份有限公司 | Piston assembly and lifting oil cylinder with same |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080611 |
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| CX01 | Expiry of patent term |