CN102588380B - A kind of hydraulic jack - Google Patents
A kind of hydraulic jack Download PDFInfo
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- CN102588380B CN102588380B CN201210083655.0A CN201210083655A CN102588380B CN 102588380 B CN102588380 B CN 102588380B CN 201210083655 A CN201210083655 A CN 201210083655A CN 102588380 B CN102588380 B CN 102588380B
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- hydraulic jack
- piston
- sleeve pipe
- piston rod
- piston assembly
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Abstract
The invention discloses a kind of hydraulic jack, comprise piston assembly, also comprise adjusting sleeve pipe, be threaded with described piston assembly on the right side of the front cover that described adjusting sleeve pipe is arranged at described hydraulic jack; When the piston rod of described piston assembly is full reduced, between the piston of described piston assembly and the cylinder barrel base of described hydraulic jack, keep reserved distance; Described hydraulic jack comprises positioning device further, selectively to limit the relative position of described adjusting sleeve pipe and described piston assembly.Compared with prior art, hydraulic jack provided by the present invention is when piston rod is full reduced, reserved distance is kept between piston and cylinder barrel base, and on the right side of front cover, be provided with the adjusting sleeve pipe be threaded with piston assembly, can by rotary regulating sleeve pipe, under the effect of external force, piston assembly is moved to the left on bore axis, and then changes the minimum length of installation size of hydraulic jack.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of hydraulic jack for engineering machinery.
Background technique
Along with the fast development of China's economic construction, market increases day by day for the demand of all kinds of engineering machinery.
Because different needs can install hydraulic jack in all kinds of engineering machinery, as being applied to the leveling cyclinder in twin-tub leveling, control the steering cylinder etc. of Vehicular turn.Hydraulic jack refers to the special device assembly that hydraulic energy (pressure, flow) can be converted to mechanical energy-straight line motion (power, acceleration) dressed up by piston rod, piston, guide sleeve, cylinder barrel, cylinder cap and all kinds of sealing group.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of typical hydraulic oil cylinder common in prior art.
Hydraulic jack comprises cylinder barrel base 101 and cylinder barrel 103, by welding, cylinder barrel base 101 and cylinder barrel 103 can be linked as entirety, be called housing assembly; Hydraulic jack also comprises piston 102, piston rod 104 and piston rod head 106, and piston 102 and piston rod 104 can be threaded connection, also can by being welded and fixed; Similarly, piston rod 104 and piston rod head 106 also by screw thread or can be welded to connect; The piston 102 linked together, piston rod 104 and piston rod head 106 can be called piston assembly.Guide sleeve 105 is also provided with near one end of piston rod head 106 at piston rod 104, the effect that guide sleeve 105 can play guiding to piston rod 104 and support, in this typical structure, guide sleeve 105 and front cover 107 are processed as one, and namely cylinder barrel base 101, cylinder barrel 103 and front cover 107 form the oil pocket closed.For preventing fluid to hydraulic jack external leakage or being leaked to low-pressure cavity by hyperbaric chamber, at cylinder barrel 103 and piston 102, piston 102 and piston rod 104, piston rod 104 and guide sleeve 105, between cylinder barrel 103 and guide sleeve 105, be provided with Sealing 108; Dust ring 109 is also provided with between front cover 107 and piston rod 104.
In actual use, two ends and the structural member of hydraulic jack are hinged, and be usually hinged on respectively at the two ends of hydraulic jack on two different structural members, the articulating point of hydraulic jack is hinge J1 and hinge J2 (shown in Figure 1).There is minimum length of installation size and maximum length of installation size in hydraulic jack.The minimum length of installation size of hydraulic jack refers to that piston rod 104 is full reduced, and namely the piston 102 of hydraulic jack returns to length when contacting with cylinder barrel base 101 between hinge J1 and hinge J2; The maximum length of installation size of hydraulic jack refers to that piston rod 104 is stretched entirely, length when namely hydraulic cylinder piston 102 and guide sleeve 105 contact between hinge J1 and hinge J2.
Usually when carrying out the installation of hydraulic jack, the distance between two relative hinges of structural member is larger or equal than hydraulic jack installation dimension, and piston rod stretches out suitable distance a little, just can realize installing.As can be seen from Figure 1 the minimum length of installation size of this kind of hydraulic jack and maximum length of installation size are fixed, so require that the size between two relative hinges is fixed, strict to the tolerance of hinge size, usually need to leave predetermined surplus so that the installation of hydraulic jack when designing.
But there is comparatively big error in structural member in course of working, when making the distance between structural member two relative hinges be less than the minimum length of installation size of hydraulic jack, very difficult to the reparation of structural member, and the minimum length of installation size of hydraulic jack cannot regulate to less direction, causes completing assembling.In addition, the situation that requirement hydraulic jack installation dimension needs to carry out small adjustment can be run in engineering machinery some mechanism design as fire-fighting truck or aerial work platform, also have minimum installation dimension to require to need adjustable design.As large-scale leveling cyclinder of ascending a height in the twin-tub leveling of series products application at present, control the steering cylinder etc. of Vehicular turn; Particularly when the hydraulic jack of a certain specification is widely used in series product, the requirement whole to hydraulic jack length of installation size adjustable can be more urgent.The hydraulic jack of same size needs to need during different minimum length of installation size to redesign new hydraulic jack drawing, reorganizes and produces, waste time and energy.
Therefore, how to meet the actual demand that series product are different, make the maximum length of installation of the hydraulic jack of same size measure-alike, minimum length of installation size can be turned down, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of hydraulic jack, for engineering machinery, the maximum length of installation of this hydraulic jack is measure-alike, and minimum length of installation size can be turned down, can meet the actual demand that series product are different.
For solving the problems of the technologies described above, the invention provides a kind of hydraulic jack, comprising piston assembly, also comprise the adjusting sleeve pipe be threaded with described piston assembly, contact with described front cover on the right side of the front cover that described adjusting sleeve pipe is arranged at described hydraulic jack; When the piston rod of described piston assembly is full reduced, between the piston of described piston assembly and the cylinder barrel base of described hydraulic jack, keep reserved distance; Described hydraulic jack comprises positioning device further, selectively to limit the relative position of described adjusting sleeve pipe and described piston assembly.
Preferably, described adjusting sleeve pipe and the length that is threaded of described piston assembly are not less than the preset space between described piston and described cylinder barrel base.
Preferably, when the piston rod of described piston assembly and piston rod head are threaded connection, described hydraulic jack also comprises fixed sleeving, and described fixed sleeving to be arranged on the right side of described front cover and to be set with fixing with described piston assembly, and described adjusting sleeve pipe and described fixed sleeving are threaded.
Preferably, the distance between described fixed sleeving and described front cover is not less than the preset space between described piston and described cylinder barrel base.
Preferably, described fixed sleeving and described piston assembly are fixed by Cock screw.
Preferably, when the piston rod of described piston assembly and piston rod head are fixedly connected by welding, described adjusting sleeve pipe and described piston rod head are threaded.
Preferably, the distance between the left end of described piston rod head and described front cover is not less than the preset space between described piston and described cylinder barrel base.
Preferably, described positioning device is the lock nut being arranged at described adjusting sleeve pipe outer end.
Relative above-mentioned background technology, hydraulic jack provided by the present invention is when piston rod is full reduced, and piston and cylinder barrel base keep reserved distance; Adjusting sleeve pipe is provided with on the right side of the front cover of hydraulic jack, the piston assembly of adjusting sleeve pipe and hydraulic jack is threaded, by rotary regulating sleeve pipe, under the effect of external force, drive piston assembly to be moved to the left on the bore axis of hydraulic jack, thus the minimum length of installation size of hydraulic jack is diminished; After adjustment completes, relative position between adjusting sleeve pipe and piston assembly can be limited by positioning device.Compared with prior art, hydraulic jack provided by the present invention is when piston rod is retracted, make to maintain reserved distance between piston and cylinder barrel base, the minimum length of installation size of hydraulic jack so just can be made to regulate to little direction, so when the hinge of structural member processes the minimum length of installation size being less than hydraulic jack, or when needing in working procedure to finely tune the minimum length of installation size of hydraulic jack, all can by rotary regulating sleeve pipe, the minimum length of installation size of hydraulic jack is regulated under the effect of external force, simple possible, be easy to regulate, be convenient to install.
Accompanying drawing explanation;
Fig. 1 is a kind of structural representation of typical hydraulic oil cylinder;
Fig. 2 is the structural representation of a kind of embodiment of hydraulic jack provided by the present invention;
Fig. 3 is the partial enlarged drawing at A position in Fig. 2;
Fig. 4 is the structural representation at hydraulic jack the second embodiment A position provided by the present invention.
Embodiment
Core of the present invention is to provide a kind of hydraulic jack for engineering machinery, and the maximum length of installation of this hydraulic jack is measure-alike, and minimum length of installation size can be turned down, can meet the actual demand that series product are different.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The nouns of locality such as left and right involved herein with relative present position of component each in Fig. 2 to Fig. 4 for benchmark definition; just in order to express easily; scheme is easier to understand, should be appreciated that the use of the described noun of locality should not limit the scope of the application's request protection.
Please refer to Fig. 2 and Fig. 3, Fig. 2 is the structural representation of a kind of embodiment of hydraulic jack provided by the present invention; Fig. 3 is the partial enlarged drawing at A position in Fig. 2.
In a kind of embodiment, hydraulic jack provided by the present invention comprises housing assembly; Housing assembly comprises cylinder barrel base 1, cylinder barrel 3, front cover 51 and guide sleeve 52, cylinder barrel base 1 can by being welded to connect the left end at cylinder barrel 3, guide sleeve 52 can be threaded connection the right-hand member at cylinder barrel 3, and guide sleeve 52 and front cover 51 can be processed as one.
Cylinder barrel 3 is main bodys of hydraulic jack, and cylinder barrel 3 will bear very large hydraulic coupling in the course of the work, and therefore, cylinder barrel 3 should have enough strength and stiffness; Cylinder barrel base 1, front cover 51 form oil closed cavity with cylinder barrel 3, and bear very large hydraulic coupling equally, therefore, cylinder barrel base 1 and end cap 51 also should have enough intensity.
Hydraulic jack also comprises piston assembly; Piston assembly comprises piston 2, piston rod 4 and piston rod head 6 further; Piston 2 is positioned at cylinder barrel 3, is connected to the left end of piston rod 4.
By multiple concrete mode, piston 2 can be connected with piston rod 4, as being threaded or half-ring connection, can certainly by Placements such as welding or taper pins.
The right-hand member of piston rod 4 stretches out cylinder barrel 3 by guide sleeve 52 and is connected with piston rod head 6, and the most frequently used Placement, for being threaded or welding, can certainly have other Placements.4, guide sleeve 52 pairs of piston rods guiding and supporting effect.
In order to ensure the reliable sealing of hydraulic jack, at cylinder barrel 3 and piston 2, piston 2 and piston rod 4, piston rod 4 and guide sleeve 52, between guide sleeve 52 and cylinder barrel 3, being provided with Sealing 11, between front cover 51 and piston rod 4, being also provided with dust ring 12.
When hydraulic jack and structural member are installed, the articulating point on hydraulic jack is hinge B and hinge C, as shown in Figure 2.Hydraulic jack and structural member can pass through hinge, can certainly connect by other means.
In order to make the minimum length of installation size of hydraulic jack can regulate to less direction, when designing, when piston rod 4 is retracted, the right side of the piston 2 and cylinder barrel base 1 that are positioned at piston rod 4 left end keeps reserved distance d (shown in Figure 2).Like this, the minimum length of installation of hydraulic jack is of a size of the distance of now hydraulic jack installing between hinge B and C; The maximum length of installation size constancy of hydraulic jack, still stretches entirely for piston rod 4, when namely piston 2 contacts with guide sleeve 52, hydraulic jack is installed the distance between hinge B and C.
When piston rod 4 and piston rod head 6 are threaded connection (being shown in Fig. 2 and Fig. 3), piston rod 4 is provided with internal thread, piston rod head 6 is provided with outside thread.
The right side of front cover 51 is provided with fixed sleeving 7, and fixed sleeving 7 is fixedly set on piston rod 4.
By multiple concrete mode, fixed sleeving 7 and piston rod 4 can be fixed, wherein one comparatively easy and reliably Placement for fixed sleeving 7 and piston rod 4 are fixed by Cock screw 10.
Adjusting sleeve pipe 9 contacts with front cover 51, and be threaded connection with fixed sleeving 7, internal thread can be set on adjusting sleeve pipe 9, fixed sleeving 7 arranges outside thread, by rotary regulating sleeve pipe 9, under the effect of external force, make piston rod 4 be moved to the left on cylinder barrel 3 axial direction, thus the minimum length of installation size of regulator solution compressing cylinder.
When two hinges of structural member are adding the larger machining error of appearance in man-hour, when making the distance on structural member between two relative hinges be less than the minimum length of installation size of hydraulic jack, owing to having reserved a distance, d when designing between the piston 2 of hydraulic jack and cylinder barrel base 1, so can by rotary regulating sleeve pipe 9, adjusting sleeve pipe 9 is moved right and needs the size of adjustment, piston assembly is made to be moved to the left until adjusting sleeve pipe 9 contacts again with front cover 51 along cylinder barrel 3 axis under external force, thus the distance reduced between hydraulic jack installation hinge B and hinge C, the minimum length of installation size of hydraulic jack can be matched with two of a structural member hinge distance, complete assembling.
Here it should be noted that, the screw-thread fit length of adjusting sleeve pipe 9 and fixed sleeving 7 and the preset space d between piston 2 and cylinder barrel base 1 cooperatively interact, and the length that is threaded namely between adjusting sleeve pipe 9 and fixed sleeving 7 is not less than the preset space d between piston 2 and cylinder barrel base 1.
Further, in order to avoid in adjustment process, fixed sleeving 7 contacts with front cover 51 or dust ring 12 and produces friction thus cause wearing and tearing, when arranging, makes the distance between fixed sleeving 7 and front cover 51 or dust ring 12 be not less than preset space d between piston 2 and cylinder barrel base 1.
After regulating the minimum length of installation size of hydraulic jack, in order to limit the relative position between adjusting sleeve pipe 9 and fixed sleeving 7, this hydraulic jack comprises positioning device further.
The concrete form of described positioning device can have multiple; Described positioning device is specifically as follows lock nut 8, and lock nut 8 is arranged on the right-hand member of adjusting sleeve pipe 9, after the minimum length of installation size of hydraulic jack has regulated, and can by the position of lock nut 8 locking secured adjusted sleeve pipe 9.
In practical set process, if because the machining error of structural member, when the minimum length of installation size of hydraulic jack need be turned down, first lock nut 8 can be unclamped, rotary regulating sleeve pipe 9, making piston assembly move under external force can after rigging position, and blocks rotation nut 8 is by adjusting sleeve pipe 9 locking, namely can complete the adjustment of the minimum length of installation size of hydraulic jack easily, complete assembling.
In addition, install hydraulic jack, in the application of engineering machinery, also may there is the situation needing the installation dimension of hydraulic jack to carry out minor adjustments, now still regulate with above-mentioned regulating method, make the size between hydraulic jack and structural member hinge adapt to engineering actual demand.
Here it should be noted that, above-mentioned piston rod 4 and being threaded on piston rod 4 of piston rod head 6 arrange internal thread, and piston rod head 6 arranges outside thread.Certainly, also outside thread can be provided with on piston rod 4 in a practical situation, piston rod head 6 arranges internal thread, at this moment, fixed sleeving 7 can be sleeved on piston rod head 6, can be fixed by Cock screw 10, the distance between fixed sleeving 7 and front cover 51 or dust ring 12 is not less than the preset space d between piston 2 and cylinder barrel base 1 simultaneously.The setting of adjusting sleeve pipe 9 is still identical with above-mentioned situation, repeats no more.
Please refer to Fig. 4, Fig. 4 is the structural representation at hydraulic jack the second embodiment A position provided by the present invention.
In the second embodiment, piston rod 4 and the piston rod head 6 of hydraulic jack are fixedly connected by welding.
Adjusting sleeve pipe 9 and piston rod head 6 are threaded connection, can on adjusting sleeve pipe 9 machining internal thread, at piston rod head 6 threading, adjusting sleeve pipe 9 is connected by threads turn with piston rod head 6.
By rotary regulating sleeve pipe 9, adjusting sleeve pipe 9 is moved right and needs the size of adjustment, under the effect of external force, make piston assembly be moved to the left along cylinder barrel 3 axis, until adjusting sleeve pipe 9 contacts again with front cover 51, thus hinge C is also moved to the left need regulate distance, and then the distance reduced between hydraulic jack installation hinge B and hinge C, reach the object minimum for hydraulic jack length of installation size turned down.
Further, in order to avoid in adjustment process, the left end of piston rod head 6 contacts with front cover 51 or dust ring 12 and produces friction thus cause wearing and tearing, when arranging, the distance between the left end of piston rod head 6 and front cover 51 or dust ring 12 is made to be not less than preset space d between piston 2 and cylinder barrel base 1.
Similarly, after regulating the minimum length of installation size of hydraulic jack, need to limit the relative position between adjusting sleeve pipe 9 and piston rod head 6, this hydraulic jack comprises positioning device further.
Described positioning device can be identical with the positioning device in the first embodiment above-mentioned, be specially lock nut 8, lock nut 8 is arranged on the right-hand member of adjusting sleeve pipe 9, after the minimum length of installation size of hydraulic jack has regulated, can by the position of lock nut 8 locking secured adjusted sleeve pipe 9.
In practical set process and engineer applied, when needing the minimum length of installation size of hydraulic jack to turn down, first lock nut 8 is unclamped, rotary regulating sleeve pipe 9, after making piston assembly move to desired location under the effect of external force, blocks rotation nut 8, by adjusting sleeve pipe 9 locking, namely completes the adjustment of the minimum length of installation size of hydraulic jack.
Here it should be noted that, in as installed process, if the hinge of structural member adds the minimal adjustment length dimension being greater than hydraulic jack man-hour, the piston rod of hydraulic jack can be pulled out the suitable distance that can realize installing to the right, because adjusting sleeve pipe and fixed sleeving are all connected as a single entity with piston assembly, so the pull-out of piston rod can not be affected.
Here also it should be noted that, in practice, the piston rod of hydraulic jack and piston rod head also have other Placement, just give two kinds of typical Placements (be threaded and weld) herein, which kind of mode piston rod regardless of hydraulic jack is connected by with piston rod head, all can when piston rod be full reduced, make reserved certain distance between piston and cylinder barrel base, then by arranging adjusting sleeve pipe in the joint of piston rod and piston rod head, piston assembly is driven to be moved to the left along the axis of cylinder barrel after making rotary regulating sleeve pipe under external force, thus reach the object minimum for regulator solution compressing cylinder length of installation size turned down.
Above hydraulic jack provided by the present invention is described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (8)
1. a hydraulic jack, comprises piston assembly, it is characterized in that, also comprises the adjusting sleeve pipe be threaded with described piston assembly, contacts on the right side of the front cover that described adjusting sleeve pipe is arranged at described hydraulic jack with described front cover; When the piston rod of described piston assembly is full reduced, between the piston of described piston assembly and the cylinder barrel base of described hydraulic jack, keep reserved distance; Described hydraulic jack comprises positioning device further, selectively to limit the relative position of described adjusting sleeve pipe and described piston assembly.
2. hydraulic jack as claimed in claim 1, it is characterized in that, described adjusting sleeve pipe is not less than the preset space between described piston and described cylinder barrel base with the length that is threaded of described piston assembly.
3. hydraulic jack as claimed in claim 2, it is characterized in that, when the piston rod of described piston assembly and piston rod head are threaded connection, described hydraulic jack also comprises fixed sleeving, described fixed sleeving to be arranged on the right side of described front cover and to be set with fixing with described piston assembly, and described adjusting sleeve pipe and described fixed sleeving are threaded.
4. hydraulic jack as claimed in claim 3, it is characterized in that, the distance between described fixed sleeving and described front cover is not less than the preset space between described piston and described cylinder barrel base.
5. hydraulic jack as claimed in claim 3, it is characterized in that, described fixed sleeving and described piston assembly are fixed by Cock screw.
6. hydraulic jack as claimed in claim 2, it is characterized in that, when the piston rod of described piston assembly and piston rod head are fixedly connected by welding, described adjusting sleeve pipe and described piston rod head are threaded.
7. hydraulic jack as claimed in claim 6, it is characterized in that, the distance between the left end of described piston rod head and described front cover is not less than the preset space between described piston and described cylinder barrel base.
8. the hydraulic jack as described in any one of claim 1 to 7, is characterized in that, described positioning device is the lock nut being arranged at described adjusting sleeve pipe outer end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210083655.0A CN102588380B (en) | 2012-03-26 | 2012-03-26 | A kind of hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210083655.0A CN102588380B (en) | 2012-03-26 | 2012-03-26 | A kind of hydraulic jack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102588380A CN102588380A (en) | 2012-07-18 |
| CN102588380B true CN102588380B (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210083655.0A Active CN102588380B (en) | 2012-03-26 | 2012-03-26 | A kind of hydraulic jack |
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| Country | Link |
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| CN (1) | CN102588380B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014212129A1 (en) * | 2014-06-25 | 2015-12-31 | Robert Bosch Gmbh | Hydraulic arrangement |
| CN106946183A (en) * | 2017-05-02 | 2017-07-14 | 宁波市加力特机械有限公司 | A kind of stay-supported hydraulic platform vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295199A (en) * | 1999-11-02 | 2001-05-16 | 速睦喜股份有限公司 | Fluid pressure cylinder capable of adjusting stroke |
| CN2644747Y (en) * | 2003-09-15 | 2004-09-29 | 江苏国力锻压机床有限公司 | Stroke adjustable hydraulic cylinder |
| CN201521504U (en) * | 2009-09-21 | 2010-07-07 | 邵阳维克液压有限责任公司 | Hydraulic cylinder |
| CN101956739A (en) * | 2010-10-25 | 2011-01-26 | 潘井仁 | Anti-bias oil cylinder of hydraulic hoist |
| CN202493517U (en) * | 2012-03-26 | 2012-10-17 | 徐州重型机械有限公司 | Hydraulic oil cylinder |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE528417C8 (en) * | 2005-03-18 | 2007-01-30 | Hydrauto Light Cylinders Bispg | Apparatus for adjusting the stroke of a pressure medium-activated piston cylinder means |
| US7343848B2 (en) * | 2006-03-21 | 2008-03-18 | Norgren, Inc. | Self-vacuum arrangement for pneumatic equipment |
-
2012
- 2012-03-26 CN CN201210083655.0A patent/CN102588380B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295199A (en) * | 1999-11-02 | 2001-05-16 | 速睦喜股份有限公司 | Fluid pressure cylinder capable of adjusting stroke |
| CN2644747Y (en) * | 2003-09-15 | 2004-09-29 | 江苏国力锻压机床有限公司 | Stroke adjustable hydraulic cylinder |
| CN201521504U (en) * | 2009-09-21 | 2010-07-07 | 邵阳维克液压有限责任公司 | Hydraulic cylinder |
| CN101956739A (en) * | 2010-10-25 | 2011-01-26 | 潘井仁 | Anti-bias oil cylinder of hydraulic hoist |
| CN202493517U (en) * | 2012-03-26 | 2012-10-17 | 徐州重型机械有限公司 | Hydraulic oil cylinder |
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| Publication number | Publication date |
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| CN102588380A (en) | 2012-07-18 |
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Effective date of registration: 20170213 Address after: 221004 Jiangsu Province, Xuzhou City Yunlong District No. 165 Patentee after: Xugong fire safety equipment Co. Ltd. Address before: 221004 Xuzhou, Zhejiang Province, Jiangsu Road No. 165 Patentee before: Xuzhou Heavy Machinery Co., Ltd. |