CN103615429A - Hydraulic oil cylinder - Google Patents
Hydraulic oil cylinder Download PDFInfo
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- CN103615429A CN103615429A CN201310684291.6A CN201310684291A CN103615429A CN 103615429 A CN103615429 A CN 103615429A CN 201310684291 A CN201310684291 A CN 201310684291A CN 103615429 A CN103615429 A CN 103615429A
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Abstract
The invention discloses a hydraulic oil cylinder. The hydraulic oil cylinder comprises a cylinder barrel, a cylinder bottom, a piston rod and a piston, and further comprises a first unloading piston and a second unloading piston. An unloading channel is formed in the piston in a penetrated mode in the front-and-back direction, the first unloading piston and the second unloading piston are located at the position of a front side outlet and the position of a back side outlet of the unloading channel respectively, the first unloading piston is connected with the second unloading piston at the position of the interior of the unloading channel, and the first unloading piston and the second unloading piston are arranged in a floating mode. A first sealing face capable of being in sealing fit with the first unloading piston is formed at the position of the front side outlet of the unloading channel, and a second sealing face capable of being in sealing fit with the second unloading piston is formed at the position of the back side outlet of the unloading channel. By means of the hydraulic oil cylinder, the sealing oil pressure in a rod cavity can be effectively reduced, the service life is prolonged, and the safety performance is improved.
Description
Technical field
The present invention relates to technical field of hydraulic oil cylinder, particularly a kind of hydraulic jack.
Background technique
Hydraulic jack is hydraulic energy to be converted to the energy conversion device of the mechanical energy of linear reciprocating motion.Hydraulic jack generally comprises by cylinder barrel, cylinder bottom, cylinder top, piston rod and piston, wherein, cylinder bottom and cylinder top are arranged at respectively bottom and the outlet of two, top of cylinder barrel, the first end of piston rod (inserting end) is arranged in cylinder barrel by piston movably, the second end of piston rod is positioned at outside, cylinder top, the first end of piston rod is together with forming rodless cavity between piston and cylinder bottom, piston rod first end is together with forming rod chamber between piston and cylinder top, like this when rodless cavity oil-feed, during rod chamber oil return, piston rod stretches out motion, otherwise piston rod is made retraction movement.
In use, hydraulic jack is usually used as the actuator of hydraulic system, in some applications, for example, in engineering machinery field, for fear of hydraulic jack, after execution, under the effect of load, there is self extending phenomenon, on the general oil-feed oil circuit at hydraulic jack and oil return circuit, the elements such as hydraulic lock or equilibrium valve are set.In the course of the work, when rod chamber oil-feed, rodless cavity oil return, and when piston rod retraction puts in place, high pressure oil in the rod chamber of hydraulic jack is closed, under this situation, if controlling hydraulic jack stretches out, due to the existence of hydraulic lock or equilibrium valve, the oil-feed state of rodless cavity may be a little earlier in the oil return state of rod chamber, thereby before hydraulic lock or equilibrium valve are not opened, rod chamber pressure will further increase, easily cause the hydralic hose booster being connected with rod chamber, or cylinder seal part is damaged, thereby have huge potential safety hazard.
Therefore, how for existing above-mentioned deficiency and defect, improving, to more adapt to and use needs, is those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, the present invention aims to provide a kind of hydraulic jack, to can effectively reduce the sealing oil pressure in rod chamber, improves working life and the Security of hydraulic jack.
Particularly, this hydraulic jack comprises cylinder barrel, cylinder bottom, piston rod and piston, also comprise the first labyrinth piston, the second labyrinth piston, wherein: described piston runs through and is provided with unloading channel on its fore-and-aft direction, described the first labyrinth piston and described the second labyrinth piston lay respectively at outlet port, front side and the rear side outlet port of described unloading channel, and between described the first labyrinth piston and described the second labyrinth piston, are connected in described unloading channel and the setting of floating; The outlet port, front side of described unloading channel is formed with the primary sealing area that can be sealed and matched with described the first labyrinth piston, and the rear side outlet port of described unloading channel is formed with the secondary sealing area that can be sealed and matched with described the second labyrinth piston; When described piston rod stretches out, described the second labyrinth piston and described secondary sealing area are sealed and matched, when described piston rod is retracted and retraction puts in place, described the first labyrinth piston and described primary sealing area are sealed and matched, at described piston rod, retract while putting in place, between described the second labyrinth piston and described secondary sealing area, form off-load direct clearance to the Pressure Drop of rod chamber to predetermined value.
Further, between the rear end of described the second labyrinth piston and described cylinder bottom inwall, be provided with the first Returnning spring.
Further, when described the first labyrinth piston and described primary sealing area are sealed and matched, the rear end of described the second labyrinth piston exceeds the ear end face of described piston, when described the second labyrinth piston and described secondary sealing area are sealed and matched, the rear end of described the second labyrinth piston does not exceed the ear end face of described piston.
Further, described the first labyrinth piston comprises the first piston body that can be sealed and matched with described primary sealing area, described the second labyrinth piston comprises second piston body that can be sealed and matched with described secondary sealing area and the piston shaft of being located at described the second piston body front side, and described piston shaft extends through described unloading channel and is connected with described first piston body.
Further, described piston is arranged at the end face side of described piston rod inserting end, described unloading channel is arranged at the central position of described piston, is arranged at the inner chamber that the front side outlet of described unloading channel is communicated with in described piston, between described inner chamber and rod chamber, is provided with and is communicated with oil circuit.
Further, the front side of described piston shaft is provided with screw rod, described first piston body runs through and is provided with tapped hole on its fore-and-aft direction, described screw rod through described tapped hole and with its formation screw pair, described screw rod is provided with nut through one end of described tapped hole.
Further, between the front side of described piston shaft and the rear side of described first piston body, in the position around described screw rod, be provided with seal ring.
Further, described piston sleeve is located at described piston rod inserting end, and described unloading channel is arranged at the position between described inner wall of cylinder and described piston rod inserting end on described piston.
Further, the front side of described piston shaft is provided with tapped hole, and the rear side of described first piston body is provided with screw rod, and described screw rod and described tapped hole form screw pair.
Further, the front side of described first piston body is provided with the second Returnning spring.
While adopting hydraulic jack of the present invention, due to the first labyrinth piston and the unsteady side outlet place, front and back that is arranged at unloading channel of the second labyrinth piston, in the course of the work, when rodless cavity oil-feed, during rod chamber oil return, piston rod stretches out, after the second labyrinth piston and unloading channel, the secondary sealing area of side outlet is sealed and matched, when rod chamber oil-feed, during rodless cavity oil return, piston rod is retracted, before the first labyrinth piston and unloading channel, the primary sealing area of side outlet is sealed and matched, when piston rod retraction puts in place, in rod chamber, seal oil pressure larger, now, between the second labyrinth piston and secondary sealing area, form off-load direct clearance to making in rod chamber pressure decreased to predetermined value, like this when continuation control piston bar stretches out, because existing effect before the oil pressure in rod chamber reduces, before hydraulic lock or equilibrium valve are not opened, the increase of rod chamber pressure is difficult to cause hydralic hose booster or cylinder seal part is damaged, thus the working life of effectively having improved Security and hydraulic jack, in addition, due to the existing effect reduction of oil pressure of rod chamber, when continuation control piston bar stretches out, the hydraulic lock on the external oil circuit of rod chamber can be opened under lower pressure, effective like this reaction velocity that improves expanding-contracting action.
Accompanying drawing explanation
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The dependency structure schematic diagram of a kind of hydraulic jack that Fig. 1 provides for the embodiment of the present invention one;
The dependency structure schematic diagram of a kind of hydraulic jack that Fig. 2 provides for the embodiment of the present invention two.
Primary component symbol description in figure:
1 cylinder barrel
2 piston rods
3 pistons
4 backing pins
5 nuts
6 first labyrinth pistons
7 second labyrinth pistons
8 first Returnning springs
9 cylinder bottoms
10 seal rings
11 rod chambers
12 rodless cavities
31 are communicated with oil circuit
32 inner chambers
33 primary sealing areas
34 unloading channels
35 secondary sealing areas
63 second mounting holes
64 second Returnning springs
71 second piston bodies
72 piston shaft
73 screw rods
74 first mounting holes
Embodiment
It should be pointed out that in this part to be only the explanation to specific embodiment to the description of concrete structure and description order, should not be considered as that protection scope of the present invention is had to any restriction.In addition,, under the situation of not conflicting, embodiment and the feature in embodiment in this part can combine mutually.
Please refer to Fig. 1 and Fig. 2, below in conjunction with accompanying drawing, the embodiment of the present invention is elaborated.
Shown in Fig. 1, the hydraulic jack of the embodiment of the present invention one can comprise cylinder barrel 1, piston rod 2, piston 3, the first labyrinth piston 6, the second labyrinth piston 7 and the first Returnning spring 8.For the ease of understanding by reference to the accompanying drawings, the application's said " front " refers to that direction (being direction down in Fig. 1 and Fig. 2), " afterwards " of towards piston rod, stretching out refer to the direction (being direction upward in Fig. 1 and Fig. 2) of retracting towards piston rod.
Wherein, piston 3 is arranged at end face (afterwards) side of piston rod 2 inserting ends, in piston 3, be formed with inner chamber 32, between inner chamber 32 and rod chamber 11, by being communicated with oil circuit 31, be communicated with, in piston 3 central positions, on its fore-and-aft direction, run through and be provided with unloading channel 34, the front and back side outlet of unloading channel 34 is communicated with inner chamber 32 and rodless cavity 12 respectively, and the outlet port, front side of unloading channel 34 is formed with primary sealing area 33, and the rear side outlet port of unloading channel 34 is formed with secondary sealing area 35.
The first labyrinth piston 6 comprises the first piston body that can be sealed and matched with primary sealing area 33, the second labyrinth piston 7 comprises second piston body 71 that can be sealed and matched with secondary sealing area 35 and the piston shaft 72 of being located at the second piston body 71 front sides, the sectional dimension of piston shaft 72 is less than the sectional dimension of unloading channel 34, first piston body and the second piston body 71 lay respectively at outlet port, front side and the rear side outlet port of unloading channel 34, the second piston body 71 extends through unloading channel 34 by piston shaft 72 and is connected with the rear side of first piston body, and being floats arranges, the first labyrinth piston 6 is done as a whole can being moved back and forth over the distance by relative unloading channel 34 with the second labyrinth piston 7.
The first Returnning spring 8 is arranged between the rear end (i.e. the rear end of the second piston body 71) and cylinder bottom 9 of the second labyrinth piston 7; When first piston body and primary sealing area 33 are sealed and matched, the rear end of the second piston body 71 exceeds the ear end face of piston 3, when the second piston body 71 is sealed and matched with secondary sealing area 35, the rear end of the second piston body 71 does not exceed the ear end face (take be positioned at unloading channel after side outlet as good) of piston 3.
Below in conjunction with concrete scene, once working principle and the beneficial effect of the hydraulic jack of above-described embodiment one are described, in this concrete scene, hydraulic jack is the actuator of hydraulic system, and is provided with hydraulic lock or equilibrium valve on the rod chamber of hydraulic jack and the external oil circuit of rodless cavity.
In the course of the work, when rodless cavity 12 oil-feeds, during rod chamber 11 oil return, under the pressure oil effect of rodless cavity 12, the second labyrinth piston 7 is sealed and matched with the secondary sealing area 35 of unloading channel 34 rear side outlets, and piston rod 2 is made extend action, when rod chamber 11 oil-feeds, during rodless cavity 12 oil return, under the effect of the pressure oil of rod chamber 11, the first labyrinth piston 6 is sealed and matched with the primary sealing area 33 of unloading channel 34 front side outlets, the rear end of the second piston body 71 exceeds the ear end face of piston 3, and piston rod 2 is made retract action, when piston rod 2 retractions put in place, in rod chamber 11, seal oil pressure larger, but because the rear end of the second piston body 71 of the second labyrinth piston 7 touches the inwall of cylinder bottom 9, the second piston body 71 is with respect to unloading channel 34 advance the pucks, between such the second piston body 71 and secondary sealing area 35, will form off-load gap (also simultaneously forming off-load gap between first piston body and primary sealing area 33), pressure oil in rod chamber 11 is unloaded to rodless cavity 12 by this off-load gap, thereby the oil pressure in rod chamber 11 is reduced, when stopping oil pressure in oil-feed or rod chamber 11 being reduced to predetermined value (corresponding with concrete structure size and the performance of associated components) in rod chamber 11, under the effect of the first Returnning spring 8, the second labyrinth piston 7 is sealed and matched with secondary sealing area 35 again.
From the above, in embodiment one hydraulic jack, the first labyrinth piston 6 and the second labyrinth piston 7 arranging that float do not affect the normal flexible of hydraulic jack, and when putting in place, piston rod 2 retractions can effectively reduce the larger oil pressure in rod chamber 11, like this when continuation control piston bar 2 stretches out, because existing effect before the oil pressure in rod chamber 11 reduces, before hydraulic lock or equilibrium valve are not opened, the increase of rod chamber 11 pressure is difficult to cause hydralic hose booster or cylinder seal part is damaged, thereby effectively improved the working life of Security and hydraulic jack, in addition, because existing effect before the oil pressure of rod chamber 11 reduces, when continuation control piston bar 2 stretches out, the hydraulic lock on the external oil circuit of rod chamber 11 can be opened under lower pressure, effective like this reaction velocity that improves expanding-contracting action.
In specific implementation process, the hydraulic jack of above-described embodiment one can also be done following at least one optimization:
One, the first Returnning spring 8 between cylinder bottom 9 and the second piston body 71 can be installed on the second piston body 71, for example, shown in Fig. 1, can on the ear end face of the second piston body 71, offer the first mounting hole 74, one end of the first Returnning spring 8 is installed in the first mounting hole 74, can make like this first Returnning spring 8 follow the second piston body 71 and move forward and backward, also can meet and when the second piston body 71 contacts with cylinder bottom, produce corresponding elastic acting force.
Two, in order to make the connection of the first labyrinth piston 6 and the second labyrinth piston 7 more fastening, can screw rod 73 be set in the front side of piston shaft 72, first piston body runs through tapped hole is set on its fore-and-aft direction, this screw rod 73 through this tapped hole and with its formation screw pair; Further, the one end that can also pass this tapped hole at screw rod 73 arranges nut 5; Further, can also offer backstop hole at the end of screw rod 73, at nut 5, be locked at after screw rod 73, with backing pin 4, insert in this backstop hole.In addition, in order to prevent when the rod chamber oil-feed, pressure oil enters in rodless cavity 12 by the gap between screw rod 73 and first piston body, can between the front side of piston shaft 72 and the rear side of first piston body, in the position around screw rod 73, seal ring 10(be set as O RunddichtringO).
Three, the front and back side outlet of unloading channel 34 is cone structure, and like this, primary sealing area 33 and secondary sealing area 35 are conical surface, and correspondingly, first piston body and the second piston body 71 are also cone structure.
In above-described embodiment one, piston 3 is arranged at the end face side of piston rod 2 inserting ends, unloading channel 34 is arranged at the central position of piston 3, but in other embodiments, when piston 3 adopts different arrangement from piston rod 2, the position of unloading channel 34 also can be adjusted as required, for example, in the embodiment of the present invention two as shown in Figure 2, piston 3 is sheathed on piston rod 2 inserting ends, unloading channel 34 is arranged at the position between cylinder barrel 1 inwall and piston rod 2 inserting ends on piston 2, miscellaneous part in embodiment two is as the first labyrinth piston 6, the second labyrinth piston 7, the first Returnning spring 8, primary sealing area 33 and secondary sealing area 35 etc. can be referring to embodiment one explanations.
In the specific implementation, in embodiment two, while to put in place in order stretching out at piston rod 2, between the first labyrinth piston 6 and primary sealing area 33, to have better and be sealed and matched, can in the front side of first piston body, offer the second mounting hole 63, the second Returnning spring 64 is installed in this second mounting hole 63.In addition, in embodiment two, the Placement of the first piston body of piston shaft 72 and the first labyrinth piston 6 can be adopted with the following method: tapped hole is offered in the front side at piston shaft 72, and the rear side of first piston body forms screw rod, and this screw rod and this tapped hole form screw pair; Further, in order to prevent that this screw pair is subject to hydraulic oil pollution or contaminated liquid force feed, can between first piston body and piston shaft 72, in the position around this screw rod, seal ring be set.
It should be noted that, in above-described embodiment one and embodiment two, the second piston body 71 is connected with first piston body through unloading channel 34 by piston shaft 72, piston shaft 72 and the second piston body 71 can be one-body molded, also can adopt other to be fixedly connected with mode, but in other embodiments, the second labyrinth piston 7 can only comprise the second piston body 71, between the second piston body 71 and the first labyrinth piston 6, can adopt other to be fixedly connected with mode, if can realize the first labyrinth piston 6 and the second labyrinth piston 7 do as a whole be to float arrange.
It should be noted that, in above-described embodiment one and embodiment two, the rear end of the second piston body 71 exceeds the ear end face of piston 3 when first piston body and primary sealing area 33 are sealed and matched, when the second piston body 71 is sealed and matched with secondary sealing area 35, the ear end face that does not exceed piston 3, but in other embodiments, be not so limited, as long as can realize corresponding function of the present invention under the effect of the first Returnning spring 8.
It should be noted that, in above-mentioned various embodiment, all adopt the first Returnning spring 8 to realize better the position adjustment of the second labyrinth piston 7, but in other embodiments, be not limited to this, as long as can realize at piston rod 2, retract while putting in place, between the second labyrinth piston 7 and secondary sealing area 35, form off-load direct clearance to the Pressure Drop of rod chamber 11 to predetermined value.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a hydraulic jack, comprises cylinder barrel (1), cylinder bottom (9), piston rod (2) and piston (3), it is characterized in that, also comprises the first labyrinth piston (6), the second labyrinth piston (7), wherein:
Described piston (3) runs through and is provided with unloading channel (34) on its fore-and-aft direction, described the first labyrinth piston (6) and described the second labyrinth piston (7) lay respectively at outlet port, front side and the rear side outlet port of described unloading channel (34), and between described the first labyrinth piston (6) and described the second labyrinth piston (7), are connected in described unloading channel (34) and the setting of floating;
The outlet port, front side of described unloading channel (34) is formed with the primary sealing area (33) that can be sealed and matched with described the first labyrinth piston (6), and the rear side outlet port of described unloading channel (34) is formed with the secondary sealing area (35) that can be sealed and matched with described the second labyrinth piston (7);
When described piston rod (2) stretches out, described the second labyrinth piston (7) is sealed and matched with described secondary sealing area (35), when described piston rod (2) is retracted and retraction puts in place, described the first labyrinth piston (6) is sealed and matched with described primary sealing area (33), at described piston rod (2), retract while putting in place, between described the second labyrinth piston (7) and described secondary sealing area (35), form off-load direct clearance to the Pressure Drop of rod chamber (11) to predetermined value.
2. hydraulic jack as claimed in claim 1, is characterized in that, between the rear end of described the second labyrinth piston (7) and described cylinder bottom (9) inwall, is provided with the first Returnning spring (8).
3. hydraulic jack as claimed in claim 2, it is characterized in that, when described the first labyrinth piston (6) is sealed and matched with described primary sealing area (33), the rear end of described the second labyrinth piston (7) exceeds the ear end face of described piston (3), when described the second labyrinth piston (7) is sealed and matched with described secondary sealing area (35), the rear end of described the second labyrinth piston (7) does not exceed the ear end face of described piston (3).
4. the hydraulic jack as described in claims 1 to 3 any one, it is characterized in that, described the first labyrinth piston (6) comprises the first piston body that can be sealed and matched with described primary sealing area (33), described the second labyrinth piston (7) comprises second piston body (71) that can be sealed and matched with described secondary sealing area (35) and the piston shaft (72) of being located at described the second piston body (71) front side, and described piston shaft (72) extends through described unloading channel (34) and is connected with described first piston body.
5. hydraulic jack as claimed in claim 4, it is characterized in that, described piston (3) is arranged at the end face side of described piston rod (2) inserting end, described unloading channel (34) is arranged at the central position of described piston (3), in described piston (3), be arranged at the inner chamber (32) that the front side outlet of described unloading channel (34) is communicated with, between described inner chamber (32) and rod chamber (11), be provided with and be communicated with oil circuit (31).
6. hydraulic jack as claimed in claim 5, it is characterized in that, the front side of described piston shaft (72) is provided with screw rod (73), described first piston body runs through and is provided with tapped hole on its fore-and-aft direction, described screw rod (73) through described tapped hole and with its formation screw pair, described screw rod (73) is provided with nut (5) through one end of described tapped hole.
7. hydraulic jack as claimed in claim 6, is characterized in that, between the front side of described piston shaft (72) and the rear side of described first piston body, in the position around described screw rod (73), is provided with seal ring (10).
8. hydraulic jack as claimed in claim 4, it is characterized in that, described piston (3) is sheathed on described piston rod (2) inserting end, and described unloading channel (34) is arranged at and on described piston (3), is positioned at the position between described cylinder barrel (1) inwall and described piston rod (2) inserting end.
9. hydraulic jack as claimed in claim 8, is characterized in that, the front side of described piston shaft (72) is provided with tapped hole, and the rear side of described first piston body is provided with screw rod, and described screw rod and described tapped hole form screw pair.
10. hydraulic jack as claimed in claim 8, is characterized in that, the front side of described first piston body is provided with the second Returnning spring (64).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310684291.6A CN103615429B (en) | 2013-12-13 | 2013-12-13 | Hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310684291.6A CN103615429B (en) | 2013-12-13 | 2013-12-13 | Hydraulic jack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103615429A true CN103615429A (en) | 2014-03-05 |
| CN103615429B CN103615429B (en) | 2016-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310684291.6A Active CN103615429B (en) | 2013-12-13 | 2013-12-13 | Hydraulic jack |
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| CN (1) | CN103615429B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729283A (en) * | 1983-11-11 | 1988-03-08 | Delibes Pty. Ltd. | Valve for use with hydraulic ram assemblies |
| DE19735979A1 (en) * | 1997-08-19 | 1999-02-25 | Zahnradfabrik Friedrichshafen | Power steering unit, especially for motor vehicles |
| US20060272497A1 (en) * | 2005-05-12 | 2006-12-07 | P. & M. Design & Consulting Ltd. | Pneumatic cylinder |
| CN201810608U (en) * | 2010-09-20 | 2011-04-27 | 三一重工股份有限公司 | Hydrocylinder with buffer function, hydraulic system and reciprocating driving mechanism |
| CN202510450U (en) * | 2012-03-30 | 2012-10-31 | 山推工程机械股份有限公司 | Hydraulic oil cylinder and hydraulic system |
| CN202768523U (en) * | 2012-08-17 | 2013-03-06 | 徐州徐工挖掘机械有限公司 | Bi-directional automatic buffering hydraulic oil cylinder |
-
2013
- 2013-12-13 CN CN201310684291.6A patent/CN103615429B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729283A (en) * | 1983-11-11 | 1988-03-08 | Delibes Pty. Ltd. | Valve for use with hydraulic ram assemblies |
| DE19735979A1 (en) * | 1997-08-19 | 1999-02-25 | Zahnradfabrik Friedrichshafen | Power steering unit, especially for motor vehicles |
| US20060272497A1 (en) * | 2005-05-12 | 2006-12-07 | P. & M. Design & Consulting Ltd. | Pneumatic cylinder |
| CN201810608U (en) * | 2010-09-20 | 2011-04-27 | 三一重工股份有限公司 | Hydrocylinder with buffer function, hydraulic system and reciprocating driving mechanism |
| CN202510450U (en) * | 2012-03-30 | 2012-10-31 | 山推工程机械股份有限公司 | Hydraulic oil cylinder and hydraulic system |
| CN202768523U (en) * | 2012-08-17 | 2013-03-06 | 徐州徐工挖掘机械有限公司 | Bi-directional automatic buffering hydraulic oil cylinder |
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| Publication number | Publication date |
|---|---|
| CN103615429B (en) | 2016-08-17 |
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