CN104196814B - Built-in stacked vitta structure hydraulic jack - Google Patents
Built-in stacked vitta structure hydraulic jack Download PDFInfo
- Publication number
- CN104196814B CN104196814B CN201410399971.8A CN201410399971A CN104196814B CN 104196814 B CN104196814 B CN 104196814B CN 201410399971 A CN201410399971 A CN 201410399971A CN 104196814 B CN104196814 B CN 104196814B
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- oil
- piston rod
- cylinder
- pipe
- piston
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- 241001463139 Vitta Species 0.000 title claims abstract description 19
- 239000012530 fluid Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 16
- 240000002444 Sphenoclea zeylanica Species 0.000 claims description 5
- 230000002093 peripheral Effects 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 10
- 238000003466 welding Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 95
- 239000010720 hydraulic oil Substances 0.000 description 25
- 210000001503 Joints Anatomy 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000001360 synchronised Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
Abstract
The invention discloses a kind of built-in stacked vitta structure hydraulic jack, including head, piston rod, end cap, cylinder head, cylinder barrel, piston, plug, center seamless pipe, oil pipe, piston, cylinder bottom.Cylinder head coaxial welding is at cylinder barrel left end, and end cap is coaxially mounted in cylinder head, and head is welded on piston rod left end, and head has oil inlet and outlet.Plug is welded on piston rod right-hand member, and piston rod is hollow, and piston is fixed on plug, and ground floor oil pipe is welded on piston rod inner, and center seamless pipe is unsettled to be fixed on inside ground floor oil pipe, utilizes two semicircular ring to be fixed on cylinder bottom simultaneously.Cylinder bottom is welded on cylinder barrel right-hand member, and cylinder bottom has two oil-through holes, and cylinder barrel is drilled with a hole E.The built-in stacked vitta structure hydraulic jack of the present invention, has and can solve existing oil cylinder complex contour, easily occur that under the narrow and small compact requirement of installing space the problem of installation deviation, whole machine installation are got up the advantage such as freer.
Description
Technical field
The present invention relates to a kind of hydraulic jack, a kind of stacked oil pipe is built in the built-in stacked oil pipe within oil cylinder
Structure hydraulic oil cylinder.
Background technology
Now market truck-mounted crane series telescopic boom cylinder, for the system of complete machine, it is desirable to it is necessary to have two are associated
Hydraulic jack does routing motion, and the large arm that so could realize truck-mounted crane can do free stretching motion, then for two phases
The hydraulic jack of association, it is necessary to oil inlet and outlet to be unified, when i.e. one oil cylinder hydraulic oil enters rod chamber by oil-in, it is desirable to
Another root oil cylinder connects hydraulic oil by a sequence valve also to enter its rod chamber accordingly, passes through sequence valve, it is achieved two oil
The coupled movements of cylinder.So for the association oil cylinder mentioned by the present invention, two oil cylinders of machine system on the one hand can be met
The requirement of coupled movements must be done, on the other hand, the present invention relates to the optimized Structure Design that oil pipe is the most built-in, contour structures letter
Single, whole machine installation is freer.
Summary of the invention
The present invention is for avoiding weak point present in above-mentioned prior art, it is provided that a kind of built-in stacked vitta structure liquid
Compressing cylinder, to solve existing oil cylinder complex contour, asking of installation deviation easily occur under the narrow and small compact requirement of installing space
Topic.
The present invention solves that technical problem is by the following technical solutions.
Built-in stacked vitta structure hydraulic jack, it is structurally characterized in that, including head, piston rod, end cap, center light
Pipe, cylinder head, oil pipe, cylinder barrel, plug, piston, cylinder bottom, valve block the first joint and the second joint；
Described piston rod is inserted in described cylinder barrel, and the left part of described piston rod stretches out in described end through described end cap
Outside lid；Described cylinder head is fixed on the left part of described cylinder barrel, and described end cap is inserted in described cylinder from the left part of described cylinder head
In head, described cylinder head and described end cap the left end of described cylinder barrel is closed；Described plug is welded on piston rod right-hand member, described work
Plug fixed cover is located on the outer peripheral face of described plug；Described cylinder bottom is fixed on the right-hand member of described cylinder barrel and by the right-hand member of described cylinder barrel
Close；
Piston rod is hollow stem, and oil pipe is welded on inside hollow piston rod, piston rod is provided with four along described work
The circumference of stopper rod is uniform and oil-through hole C along piston rod described in the radial penetration of described piston rod；
Within the left end of described center seamless pipe is inserted in described oil pipe after passing described piston；Described center seamless pipe
Right part is locked bottom cylinder bottom, by unsettled for the left end of the center seamless pipe inside being fixed on oil pipe by two semicircular ring；
Described valve block is fixed on the right part of described cylinder bottom, described first joint and the second joint, is welded on described valve block
On.
The construction features of the built-in stacked vitta structure hydraulic jack of the present invention lies also in:
The part that matches with described center seamless pipe on the inner peripheral surface of described piston is provided with multiple sealing member.
Being drilled with a hole E on described cylinder barrel, cylinder bottom is internally provided with the first oil groove and second excessively and crosses oil groove.
First hydraulic fluid port A and the second hydraulic fluid port B is arranged in the head of piston rod left part；Described first hydraulic fluid port A and oil pipe
Intracavity inter-connection；Described second hydraulic fluid port B is connected with the chamber between described piston rod with described oil pipe.
Compared with the prior art, the present invention has the beneficial effect that:
The built-in stacked vitta structure hydraulic jack of the present invention, by head, piston rod, end cap, cylinder head, cylinder barrel, piston, blocks up
Head, center seamless pipe, oil pipe, piston, cylinder bottom composition.Cylinder head coaxial welding is at cylinder barrel left end, and end cap is coaxially mounted in cylinder head,
Head is welded on piston rod left end, and head has oil inlet and outlet, it is ensured that hydraulic oil can enter rod chamber within cylinder barrel with
Rodless cavity, it is achieved piston rod can motion to the left and to the right inside cylinder barrel.Plug is welded on its right-hand member, and piston rod is hollow
, piston is fixed on plug, and ground floor oil pipe is welded on piston rod inner, is synchronized with the movement with piston rod, and center seamless pipe hangs
Sky is fixed on inside ground floor oil pipe, utilizes two semicircular ring to be fixed on cylinder bottom simultaneously, it is ensured that oil cylinder is during running
It does relative motion with between piston rod.Cylinder bottom is welded on cylinder barrel right-hand member, cylinder bottom has two oil-through holes, cylinder barrel is drilled with one
Hole, during logical oil, a part is by rod chamber, rodless cavity in oil-through hole entrance cylinder barrel, and another part is sent into by sequence valve by oilhole
Another root hydraulic jack rod chamber, rodless cavity associated therewith, it is achieved can move with associated synchronisation between it.
Due to the fact that the new structure using stacked oil pipe built-in, it is achieved that the synchronization association fortune between two oil cylinders
Dynamic, this novel oil cylinder is without external oil pipe simultaneously, whole machine installation get up comparison freely, can avoid that external chi occurs in installation process
The most reciprocity very little generation causing installing phenomenon.
The built-in stacked vitta structure hydraulic jack of the present invention, has and can solve existing oil cylinder complex contour, at installation sky
Between easily occur that the problem of installation deviation, whole machine installation are got up the advantage such as freer under narrow and small compact requirement.
Accompanying drawing explanation
Fig. 1 is the sectional view of the built-in stacked vitta structure hydraulic jack of the present invention.
Fig. 2 is the partial schematic diagram of the top view (in Fig. 1 K to) of Fig. 1 structural representation.
Label in accompanying drawing 1～accompanying drawing 2: 1 head, 2 piston rods, 3 end caps, 4 center seamless pipes, 5 cylinder heads, 6 oil pipes, 7 cylinder barrels,
8 plugs, 9 pistons, 10 sealing members, 11 cylinder bottoms, 12 snap rings, 13 valve blocks, 14 first joints, 15 second joints, A the first oil-in, B
Second oil-out, C piston rod oil-through hole, D rodless cavity associated hydraulic fluid port, and E rod chamber associated hydraulic fluid port, 1-1 rod chamber, 2-1 without
Bar chamber, 3-1 first crosses oil groove, and 4-1 second crosses oil groove.
Below by way of detailed description of the invention, and the invention will be further described to combine accompanying drawing.
Detailed description of the invention
See figure accompanying drawing 1～accompanying drawing 2, the built-in stacked vitta structure hydraulic jack of the present invention include head 1, piston rod 2,
End cap 3, center seamless pipe 4, cylinder head 5, oil pipe 6, cylinder barrel 7, plug 8, piston 9, cylinder bottom 11, valve block 13 first joint 14 and second
Joint 15；
Described piston rod 2 is inserted in described cylinder barrel 7, and the left part of described piston rod 2 stretches out in institute through described end cap 3
State outside end cap 3；Described cylinder head 5 is fixed on the left part of described cylinder barrel 7, and described end cap 3 inserts from the left part of described cylinder head 5
In described cylinder head 5, described cylinder head 5 and described end cap 3 left end of described cylinder barrel 7 is closed；Described plug 8 is welded on piston
Bar 2 right-hand member, described piston 9 fixed cover is located on the outer peripheral face of described plug 8；Described cylinder bottom 11 is fixed on the right side of described cylinder barrel 7
Hold and the right-hand member of described cylinder barrel 7 is closed；
Piston rod 2 is hollow stem, and it is internal that oil pipe 6 is welded on hollow piston rod 2, piston rod 2 is provided with four along institute
State the circumference of piston rod 2 uniform and along the oil-through hole C of piston rod 2 described in the radial penetration of described piston rod 2；
Within the left end of described center seamless pipe 4 is inserted in described oil pipe 6 after passing described piston 9；Described center light
The right part of pipe 4 is locked bottom cylinder bottom 11 by two semicircular ring 12, is fixed on oil pipe by unsettled for the left end of center seamless pipe 4
The inside of 6；
Described valve block 13 is fixed on the right part of described cylinder bottom 11, described first joint 14 and the second joint 15, is welded on
On described valve block 13.
The part that matches with described center seamless pipe 4 on the inner peripheral surface of described piston 9 is provided with multiple sealing member 10.Many
Individual sealing member 10 constitutes a sealing member group, and sealing member is in center seamless pipe 4 mantle friction, it is desirable to center light tube-surface is coarse
Degree reaches Ra0.4-Ra0.8.
Being drilled with a hole E on described cylinder barrel 7, cylinder bottom 11 is internally provided with the first oil groove 3-1 and second excessively and crosses oil groove 4-1.
First hydraulic fluid port A and the second hydraulic fluid port B is arranged in the head of piston rod 2 left part；Described first hydraulic fluid port A and oil pipe 6
Intracavity inter-connection；Described second hydraulic fluid port B is connected with the chamber between described piston rod 2 with described oil pipe 6.
In the accompanying drawing 1 of the present invention, set direction that piston rod 2 stretches out as front (i.e. left direction in Fig. 1), otherwise be
Rear (i.e. right direction in Fig. 1).Accompanying drawing 2 be in Fig. 1 K to the partial view of (vertical view).
Piston rod 2 cylindrical and the liquid-tight envelope of inner circle of end cap 3, piston 9 cylindrical and the cylinder barrel 7 liquid-tight envelope of inner circle；Center seamless pipe 4
With the piston 9 liquid-tight envelope of inner circle, the inner chamber of cylinder barrel 7 is separated into rod chamber 1-1 and rodless cavity 2-1 by described piston 9, for piston
The oil-in A that bar 2 stretches out communicates with described rodless cavity 2-1, oil return opening B communicates with described rod chamber 1-1；Piston rod 2 is
Hollow stem, it is internal that oil pipe 6 is welded on hollow piston rod 2, piston rod 2 is provided with four uniform oil-through hole C, in order to work as hydraulic fluid port
During B oil-feed, hydraulic oil gap between piston rod 2 inner surface and oil pipe 6 is passed through, and a part of hydraulic oil enters through oil-through hole C
Realizing piston rod to rod chamber 2-1 rearward to move, in rod chamber, a part of hydraulic oil can lead to through cylinder barrel 7 upper oil hole E simultaneously
Cross sequence valve and be connected to the rod chamber of another root hydraulic jack, then another root hydraulic cylinder piston rod also synchronizes rearward to move,
Realize two hydraulic jacks to be synchronized with the movement.
Center seamless pipe 4 is locked bottom cylinder bottom 11 by two semicircular ring 12, it unsettled is fixed in oil pipe 6
Portion, cylinder bottom 11 is internally provided with two oil grooves excessively, and wherein the first oil groove 3-1 excessively communicates with oil cylinder rodless cavity 2-1, and second crosses oil groove
4-1 communicates with hydraulic fluid port D, and hydraulic fluid port D is connected to the hydraulic jack rodless cavity being associated, first joint the 14, second joint by sequence valve
15 are welded on the valve block 13 that cylinder bottom 11 bottom is fixing, and it is communicated by sequence valve connection, when oil-in A oil-feed, and hydraulic oil
Initially enter oil pipe 6 internal, flowing through center seamless pipe 4, enter into valve block 13 internal, then start shunting, a part of hydraulic pressure
The oil first joint the 14, second joint 15 through being connected is flowed into the first oil groove 3-1 excessively that cylinder bottom 11 is arranged, and enters finally into oil
Cylinder rodless cavity 2-1, it is achieved piston rod 2 forwards moves；The second oil groove 4-1 excessively that another part hydraulic oil is arranged through cylinder bottom 11,
Flowed out by hydraulic fluid port D, finally arrange and flow into the hydraulic jack rodless cavity that is associated, it is achieved two cylinder piston rods associations, synchronize to
Forward.
Piston rod 2 is hollow stem, and oil pipe 6 welds therein, and is provided with uniform aperture C on piston rod 2, it is ensured that piston
Gap between bar 2 inwall and oil pipe 6 in addition to uniform aperture C, the equal positive confinement in remaining position.
The liquid-tight envelope of inner circle it is, it is desirable to piston rod surface is coarse between hollow piston rod 2 and end cap 3, piston 9 and cylinder barrel 7
Degree is between Ra0.1-Ra0.2, and cylinder barrel inner surface requires that roughness is between Ra0.3-Ra0.4.
Center seamless pipe 4 is fixed on cylinder bottom 11 locked by two semicircular ring 12, it is achieved between itself and piston rod 2
Do relative motion.
Oil cylinder do stretch out, retract action time, do with center seamless pipe 4 inside piston 9 and relative transport merit, for realizing sealing effect
Really, being provided with the sealing member group being made up of sealing member 10 inside piston, sealing member 10, in center seamless pipe 4 mantle friction,
Centering seamless pipe surface roughness reaches Ra0.4-Ra0.8.
Being drilled with a hole E on cylinder barrel 7, cylinder bottom 11 is internally provided with the first oil groove 3-1 and second excessively and crosses oil groove 4-1, hydraulic oil
Through via E, first cross oil groove 3-1 and second and cross oil groove 4-1 and associate the rod chamber of oil cylinder with another and communicate with rodless cavity, it is achieved two
The coupled movements of root oil cylinder.Wherein it is provided with a hole E on rod chamber 1-1 region inner cylinder tube 7, a sequence valve at the E of hole, can be connected to, even
It is connected to the rod chamber of another associated hydraulic oil cylinder, allows a part of hydraulic oil in cylinder rod chamber 1-1 of the present invention flow into phase through hole E
The hydraulic jack rod chamber of association realizes linkage.
First hydraulic fluid port A and the second hydraulic fluid port B is arranged in the head of piston rod 2 end.
Oil pipe is placed in inside oil cylinder, and oil cylinder outer surface, without the constraint of the weldments such as oil pipe, is installed comparable free, flexibly.
The built-in stacked vitta structure hydraulic jack of the present invention, its work process is as described below.
Rod chamber 1-1, rodless cavity 2-1 oil inlet passage are arranged at inside oil cylinder, and when oil-in A oil-feed, hydraulic oil enters
Entering to oil pipe 6 internal, the internal sealing state that is in of oil pipe 6, and an internal unsettled center seamless pipe 6 of fixing, hydraulic oil enters
Internal to center seamless pipe 6, hydraulic oil, when flowing through valve block 13, forms shunting, and a part of hydraulic oil first is connect by communicate
The 14, second joint 15, flow through cylinder bottom 11 first crosses oil groove 3-1, enters eventually into oil cylinder rodless cavity 2-1, it is achieved piston rod
Forwards move；Another part hydraulic oil flows directly into the second oil groove 4-1 excessively of cylinder bottom 11, flows out through oil-through hole D, at oilhole D
It is provided with a sequence valve, the hydraulic oil of outflow is delivered to the hydraulic jack rodless cavity being associated, it is achieved the piston of two oil cylinders
Bar the most forwards moves, and is in linkage status.When oil-out B oil-feed, hydraulic oil enters into shape between piston rod 2 and oil pipe 6
The sealing area in addition to uniform aperture C become, hydraulic oil only enters into rod chamber 1-1 through the most not aperture C, it is achieved piston rod
2 rearward move, and simultaneously inside rod chamber 1-1, cylinder barrel 7 arrange an oilhole E, and rod chamber 1-1 internal hydraulic pressure oil is realizing
While piston rod 2 rearward moves, some hydraulic oil can flow out through oil-through hole E, can arrange a sequence valve at oilhole E
It is connected to the rod chamber of associated hydraulic oil cylinder, the rod chamber of association oil cylinder can be entered into when hydraulic oil is by oilhole E, it is achieved
The piston rod of two hydraulic jacks rearward moves simultaneously, forms coupled movements.
The built-in stacked vitta structure hydraulic jack of the present invention, hollow piston rod internal welding is connected to oil pipe；Described center
Seamless pipe is locked bottom cylinder bottom by it by two semicircular ring, unsettled fixing with oil pipe inside, define three stacked oil pipes；
Described center seamless pipe and piston interior surface are by the sealing member liquid-tight envelope of group's inner circle, it is desirable to there is roughness requirements on seamless pipe surface,
Seamless pipe selects 20 essences to pull out seamless pipe herein；It is relative motion when oil cylinder runs between described piston rod and seamless pipe；Described
Cylinder bottom has two and crosses oil groove, is shunted by hydraulic oil, and a part flows into rodless cavity, and another part flows into phase therewith by sequence valve
The rodless cavity of the hydraulic jack of association；Being provided with an oil-through hole on described cylinder barrel, cylinder barrel and piston rod outer surface have defined bar
Chamber, when oil cylinder runs, hydraulic oil is flowed into rod chamber by the uniform aperture on piston, and a part realizes piston rod rearward movement, separately
A part flows into hydraulic jack rod chamber associated therewith by the oil-through hole arranged on cylinder barrel；Described oil inlet and outlet is respectively provided with
In head.The present invention built-in stacked vitta structure hydraulic jack, not only achieves the coupled movements between two hydraulic jacks,
And contour structures is simple, and oil pipe is the most built-in, compact conformation, easily manufactured, when final assembly, in narrow and small installing space
Can freely install, safe and reliable, service life is long.
The hydraulic jack of the present invention, crosses oil oil pipe and is arranged at inside hydraulic jack, define built-in stacked three-layer-liquid pressure
The special construction of oil pipe, i.e. can guarantee that the stable operation of hydraulic jack of the present invention, can realize again hydraulic jack associated therewith
Stable operation, contour structures is simple, compact, can install very easily at narrow and small installing space.
In order to make the oil cylinder can be with even running, it is desirable to cylinder rod chamber, rodless cavity, oil pipe are formed with plunger rod interior surface
Region is in addition to oil-through hole, and each welding position and sealing member region must assure that positive confinement.
In order to avoid do between piston rod with center seamless pipe relative fortune merit time sealing member damage and cause draining, described in
Heart seamless pipe surface roughness have to reach Ra0.4-Ra0.8.
Center seamless pipe is locked at cylinder bottom position by it by two half-round clamping rings, it is ensured that piston rod does relative fortune with it
Dynamic.
In order to ensure that oil cylinder of the present invention and another root hydraulic jack associated there realize coupled movements, for there being bar
Chamber, rodless cavity are each provided with the rod chamber that two oil-through holes correspond hydraulic jack and communicate with rodless cavity.
Hydraulic jack of the present invention be arranged at piston rod head position into and out of hydraulic fluid port A and B, and logical fluid pressuring oil pipe is equal
It is arranged on inside hydraulic jack.
The built-in stacked vitta structure hydraulic jack of the present invention, oil pipe is arranged at inside hydraulic jack, and into and out of hydraulic fluid port
It is arranged at piston rod head position, the hydraulic jack of the associated that simultaneously can link, in the hydraulic jack of same type, this
Inventive structure is simple, compact, convenient processing, and whole machine installation is freely, conveniently.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.The technology of the industry
The personnel simply present invention it should be appreciated that the present invention is not restricted to the described embodiments, described in above-described embodiment and description
Principle, the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, these change and
Improvement both falls within the range of claimed invention.The protection domain of application claims by appending claims and
Equivalent defines.
Claims (4)
- The most built-in stacked vitta structure hydraulic jack, is characterized in that, including head (1), piston rod (2), end cap (3), center light Bright pipe (4), cylinder head (5), oil pipe (6), cylinder barrel (7), plug (8), piston (9), cylinder bottom (11), valve block (13) first joint (14) With the second joint (15)；Described piston rod (2) is inserted in described cylinder barrel (7), and the left part of described piston rod (2) is stretched out through described end cap (3) Outside described end cap (3)；Described cylinder head (5) is fixed on the left part of described cylinder barrel (7), and described end cap (3) is from described cylinder head (5) in left part is inserted in described cylinder head (5), by described cylinder head (5) and described end cap (3) by the left end of described cylinder barrel (7) Close；Described plug (8) is welded on piston rod (2) right-hand member, and described piston (9) fixed cover is located at the outer peripheral face of described plug (8) On；Described cylinder bottom (11) is fixed on the right-hand member of described cylinder barrel (7) and is closed by the right-hand member of described cylinder barrel (7)；Piston rod (2) is hollow stem, and it is internal that oil pipe (6) is welded on hollow piston rod (2), and piston rod (2) is provided with four edges The circumference of described piston rod (2) uniform and along the oil-through hole C of piston rod (2) described in the radial penetration of described piston rod (2)；Within the left end at described center seamless pipe (4) is inserted in described oil pipe (6) after passing described piston (9)；Described center light The right part of bright pipe (4) is locked, by unsettled for the left end of center seamless pipe (4) in cylinder bottom (11) bottom by two semicircular ring (12) It is fixed on the inside of oil pipe (6)；Described valve block (13) is fixed on the right part of described cylinder bottom (11), described first joint (14) and the second joint (15), weldering It is connected on described valve block (13).
- Built-in stacked vitta structure hydraulic jack the most according to claim 1, is characterized in that, interior at described piston (9) The part that matches with described center seamless pipe (4) on side face is provided with multiple sealing member (10).
- Built-in stacked vitta structure hydraulic jack the most according to claim 1 and 2, is characterized in that, on described cylinder barrel (7) Being drilled with a hole E, cylinder bottom (11) is internally provided with the first oil groove (3-1) and second excessively and crosses oil groove (4-1).
- Built-in stacked vitta structure hydraulic jack the most according to claim 1 and 2, is characterized in that, the first oil-in A and Two hydraulic fluid port B are arranged in the head of piston rod (2) left part；Described first oil-in A and the intracavity inter-connection of oil pipe (6)；Institute The chamber stated between the second hydraulic fluid port B with described piston rod (2) with described oil pipe (6) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410399971.8A CN104196814B (en) | 2014-08-13 | Built-in stacked vitta structure hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410399971.8A CN104196814B (en) | 2014-08-13 | Built-in stacked vitta structure hydraulic jack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104196814A CN104196814A (en) | 2014-12-10 |
| CN104196814B true CN104196814B (en) | 2016-11-30 |
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