CN104776081A - Hydraulic cylinder stop valve device and hydraulic cylinder fitted with device - Google Patents
Hydraulic cylinder stop valve device and hydraulic cylinder fitted with device Download PDFInfo
- Publication number
- CN104776081A CN104776081A CN201410656705.9A CN201410656705A CN104776081A CN 104776081 A CN104776081 A CN 104776081A CN 201410656705 A CN201410656705 A CN 201410656705A CN 104776081 A CN104776081 A CN 104776081A
- Authority
- CN
- China
- Prior art keywords
- oil
- hydraulic cylinder
- hydraulic
- valve
- positioning groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
- F15B2215/30—Constructional details thereof
Abstract
The invention discloses a hydraulic cylinder stop valve device and a hydraulic cylinder fitted with the device. The stop valve device comprises a valve block and a limiting baffle plate, wherein the valve block is positioned on a hydraulic cylinder barrel; the valve block is provided with an oil port II for working together with an oil port I communicated with a rod cavity in the hydraulic cylinder barrel, a positioning groove, and an oil duct for being communicated with a rodless cavity respectively; the oil port II is communicated with the oil duct through a positioning groove, thereby forming a hydraulic oil inlet/outlet channel of the hydraulic cylinder; a valve rod for opening/closing the hydraulic oil channel is arranged on the positioning groove through a guide sleeve; the limiting baffle plate is arranged on a hydraulic cylinder piston rod and is used for pushing the valve rod to close the hydraulic oil channel. The working stroke of the oil cylinder can be changed by adjusting the position of the limiting baffle plate; meanwhile, the piston rod is prevented from being collided onto an oil cylinder when the piston rod is about to run onto a stroke terminal. The dual actions of adjusting the working stroke of the oil cylinder and avoiding high-pressure impact can be achieved synchronously, and the machining cost is lowered by adjusting with a mechanical device.
Description
Technical field
The present invention is a kind of oil hydraulic cylinder stop valve installation and the oil hydraulic cylinder that this device is housed, and belongs to oil hydraulic cylinder technical field.
Background technique
The working stroke of current hydraulic jack is generally regulated by displacement transducer or position limit switch, the impacting with high pressure of oil cylinder is absorbed by special damping device, two kinds of functions need the independent part of design to realize, and also need electrical control to realize, cost is higher.
The oil hydraulic cylinder stop valve installation of the present invention's design can realize cylinder efficient stroke simultaneously and can be in harmonious proportion the double action avoiding impacting with high pressure, is regulated, cut down finished cost by mechanical device.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art and a kind of oil hydraulic cylinder stop valve installation be provided and the oil hydraulic cylinder of this device is housed, cylinder efficient stroke can be realized simultaneously and can be in harmonious proportion the double action avoiding impacting with high pressure, regulated by mechanical device, cut down finished cost.
Technological scheme of the present invention is: a kind of oil hydraulic cylinder stop valve installation, comprises the valve block be positioned on Barrel of Hydraulic Cylinders; Valve block is respectively equipped with for the hydraulic fluid port two of hydraulic fluid port one cooperating that Barrel of Hydraulic Cylinders is connected with rod chamber, positioning groove, oil duct for being connected with rodless cavity, hydraulic fluid port two to be connected with oil duct through positioning groove and to form the entering of oil hydraulic cylinder/return hydraulic oil channel, and the valve rod for opening/closing hydraulic oil channel is loaded on positioning groove through guide sleeve; Also comprise the postive stop baffle being arranged on and hydraulic cylinder piston rod being closed hydraulic oil channel for promoting valve rod.
The valve block at described positioning groove notch place is provided with dust cover, and dust cover one end is plugged in guide sleeve, and it is corresponding with postive stop baffle that valve rod passes dust cover; The seal ring preventing fluid from revealing is provided with between described guide sleeve and positioning groove, between valve rod and guide sleeve, between valve rod and dust cover.
Described positioning groove is stepped groove, comprises the small stair portion be connected successively, middle stepped part, large stepped part; Valve rod is stepped shape, comprises stub end and little head end, is Spielpassung between small stair portion and the stub end of valve rod, and gap is 0.038 ~ 0.06mm.
Described oil duct is connected with middle stepped part; Valve block between described hydraulic fluid port two and positioning groove is provided with transition groove.
Be provided with flange one in the middle part of described guide sleeve outer wall, guide sleeve one end is stretched into middle stepped part, is stuck in the large stepped part of positioning groove through flange one; Guide sleeve inwall is provided with the flange two for the valve head of spacing valve rod; Be Spielpassung between guide sleeve outer wall and middle stepped part, the guide sleeve stretching into middle stepped part has drain tap, the diameter of phi=0.5 ~ 1.5mm of drain tap.
Described seal ring comprises be provided with O type circle one, O type circle back-up ring between guide sleeve and positioning groove; Be provided with y-type seal ring between valve rod and guide sleeve, y-type seal ring is between flange two and dust cover; O type circle two, dust ring is provided with between valve rod and dust cover; The stub end of described valve rod is equipped with seal ring, and the little head end of valve rod is successively through flange two, y-type seal ring, O type circle two, dust ring; Gap between described guide sleeve and large stepped part is 0.027 ~ 0.043mm.Excesssive gap or too smallly all can affect seal ring working life.
The surface roughness value of described positioning groove inwall is not more than Ra0.8; Small stair portion and middle stepped part joint are provided with chamfering one, angle [alpha]=50 of chamfering one ° ~ 70 °, the length l=2 ~ 3mm of chamfering one, chamfer radius R=3 ~ 5mm; Large stepped part (20) outer end is provided with chamfering two, angle beta=50 of chamfering two ° ~ 70 °, the length d=2 ~ 3mm of chamfering two, chamfer radius r=2 ~ 3mm; The stub end both sides of described valve rod are respectively equipped with chamfering three, chamfer radius r '=0.5 ~ 1.5mm; The surface roughness value of the little head end cylindrical of described valve rod is not more than Ra0.8, and little head end end face is provided with bevelling γ, γ=15 ° ~ 20 °, the length L=3 ~ 5mm of bevelling, chamfer radius R '=3 ~ 5mm.
Described postive stop baffle is active open circle, and the opening of active open circle is equipped with the wing nut for clamping/unclamping piston rod.
An oil hydraulic cylinder for described stop valve installation is housed, comprises cylinder barrel, piston rod, piston, also comprise a stop valve installation, described stop valve installation comprises the valve block be positioned on Barrel of Hydraulic Cylinders; Valve block is respectively equipped with for the hydraulic fluid port two of hydraulic fluid port one cooperating that Barrel of Hydraulic Cylinders is connected with rod chamber, positioning groove, oil duct for being connected with rodless cavity, hydraulic fluid port two to be connected with oil duct through positioning groove and to form the entering of oil hydraulic cylinder/return hydraulic oil channel, and the valve rod for opening/closing hydraulic oil channel is loaded on positioning groove through guide sleeve; Also comprise the postive stop baffle being arranged on and hydraulic cylinder piston rod being closed hydraulic oil channel for promoting valve rod.
The corresponding rod chamber place of described cylinder barrel is provided with hydraulic fluid port one; The corresponding rodless cavity place of described cylinder barrel is provided with hydraulic fluid port three, and hydraulic fluid port two-way oil channel, oil pipe are connected with hydraulic fluid port three; One end of the packaged corresponding rod chamber on cylinder barrel of described valve.
Valve block is provided with the small stair portion (recess) coordinated with valve rod, is separately provided with the recess coordinated with guide sleeve; Be provided with the abnormity circle preventing fluid from revealing between valve rod and recess, between valve rod and guide sleeve, be provided with the Y-shaped ring preventing fluid from revealing, between valve rod and dust cover, be provided with the O type circle preventing oil liquid leakage and the dust ring preventing foreign matter; The O type circle, the O type circle back-up ring that prevent fluid from revealing is provided with between guide sleeve and recess; Wherein Y-shaped ring and O type circle are compressed by dust cover, and dust cover finally uses bolton on valve block.
When hydraulic oil enters rodless cavity from hydraulic fluid port, valve rod stretches out and contacts with postive stop baffle, and piston rod stretches out; When hydraulic oil enters rod chamber from hydraulic fluid port, piston rod is retracted, and when postive stop baffle and valve stem contacts, valve rod is retracted, and the recess place hydraulic oil on valve block is shut by the abnormity circle on valve rod, and the oil circuit between hydraulic fluid port and oil cylinder disconnects, and piston rod movement stops.
By regulating the position of postive stop baffle, the working stroke of oil cylinder can being changed, ensureing that piston rod does not directly strike on oil cylinder when being about to run to stroke terminal simultaneously, ensureing that piston rod does not directly strike on cylinder bottom when retracting simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.(valve rod retracted mode)
Fig. 2 is the sectional view of Fig. 1.
Fig. 3 is structural representation of the present invention (valve rod stretches out state)
Fig. 4 is the structural representation of stop valve spool of the present invention.
Fig. 5 is the structural representation of valve block.
Fig. 6 is the sectional view of Fig. 5.
Fig. 7 is the structural representation of postive stop baffle.
Fig. 8 is the right elevation of Fig. 7.
Embodiment
In Fig. 1,2,3, hydraulic jack of the present invention comprises cylinder barrel (27), piston rod (7), piston (26), also comprise a stop valve installation, stop valve installation primarily of valve block (8), valve rod (9), guide sleeve (10), dust cover (21), be arranged on the postive stop baffle (6) on piston rod (7) and seal composition everywhere.Valve block (8) is welded on cylinder barrel (27), and guide sleeve (10) dust cover (21) compresses, and dust cover (21) finally uses bolt (22) to be fastened on valve block (8).Hydraulic fluid port two (3), oil duct (5) are arranged on valve block (8), hydraulic fluid port two (3) is connected with rodless cavity (1) by oil duct (5), hydraulic fluid port one (4) is welded on cylinder barrel (27), and hydraulic fluid port one (4) is connected with rod chamber (2) by oil duct (28).Valve block (8) is provided with positioning groove (29), and valve rod (9) is loaded on positioning groove (29) through guide sleeve (10), and the valve rod (9) be arranged on the positioning groove (29) of valve block (8) can moving linearly under oil pressure effect.Postive stop baffle (6) can together with piston rod (7) moving linearly.Postive stop baffle (6) position can be adjusted by wing nut.
Cylinder bottom (24) is welded on cylinder barrel (27), and piston (26) is arranged on piston rod (7), and locks with locking nut (25), and valve block (8) is welded on cylinder barrel (27).Postive stop baffle (6) is arranged on piston rod (7), now hydraulic fluid port one (4) oil-feed, hydraulic fluid port two (3) oil return, piston rod (7) is retracted under hydraulic oil effect, after postive stop baffle (6) on it touches valve rod (9), valve rod (9) is moved to the left small stair portion (recess) (19) that enter in valve block (8), recess (19) place hydraulic oil on valve block (8) is shut by the abnormity circle (13) on valve rod (9), hydraulic fluid port two (3) and oil duct (5) oil circuit disconnect, and piston rod (7) motion stops (as Fig. 1).Hydraulic fluid port one (4) is welded on cylinder barrel (27), and hydraulic fluid port one (4) is by oil duct (28) and rod chamber (2) UNICOM.Hydraulic fluid port two (3) oil-feed, hydraulic fluid port one (4) oil return, valve rod (9) moves right under hydraulic oil effect, and hydraulic fluid port two (3) is communicated with oil duct (5) oil circuit, and piston rod (7) stretches out (as Fig. 3) under hydraulic oil effect.
In Fig. 4, the abnormity circle (13) preventing fluid from revealing is provided with between the recess (19) of valve rod (9) and positioning groove, be provided with the Y-shaped ring (17) preventing fluid from revealing between valve rod (9) and guide sleeve (10), between valve rod (9) and dust cover (21), be provided with the O type circle (16) preventing oil liquid leakage and the dust ring (18) preventing foreign matter.The O type circle (14), O type circle (11), O type circle back-up ring (15) that prevent fluid from revealing is provided with between guide sleeve (10) and large stepped part (20); Wherein Y-shaped ring (17) and O type circle (11) are compressed by dust cover (21), when valve rod (9) move right enter little guide sleeve (10) time, hydraulic oil is discharged in little guide sleeve (10) by drain tap (12).Rodless cavity (1) is entered by oil duct (5).Chamfer radius r '=1mm in figure, γ=20 °, bevelling, the length L=4mm of bevelling, chamfer radius R '=3mm, drain tap diameter of phi=1mm.
In Fig. 5,6, positioning groove (29) is stepped groove, comprise small stair portion (19) connected successively, middle stepped part (30), large stepped part (20), be Spielpassung between the valve head of small stair portion (19) and valve rod (9), gap is 0.038 ~ 0.06mm.Valve block (8) is provided with the small stair portion (19) coordinated with valve rod (9), the large stepped part (20) coordinated with guide sleeve (10), and is provided with hydraulic fluid port two (3) and oil duct (5).Chamfer radius R=5mm in figure, chamfering α=60 °, the length l=2mm of chamfering, chamfer radius r=2mm, undercut ss=60 °, the length d=2mm of chamfering.
In Fig. 7,8, postive stop baffle (6) is locked on piston rod (7) by wing nut (23), its mounting point adjustable, thus regulates the working stroke of oil cylinder.Postive stop baffle is divided into upper and lower two halves, and two-part binding site side is hinged, and opposite side wing nut is fixed together, and wherein upper half part is with stiffening rib.
Claims (10)
1. an oil hydraulic cylinder stop valve installation, is characterized in that: comprise the valve block (8) be positioned on Barrel of Hydraulic Cylinders (27); Valve block (8) is respectively equipped with for the hydraulic fluid port two (3) of hydraulic fluid port one (4) cooperating that Barrel of Hydraulic Cylinders is connected with rod chamber, positioning groove (29), oil duct (5) for being connected with rodless cavity, hydraulic fluid port two (3) to be connected with oil duct (5) through positioning groove (29) and to form the entering of oil hydraulic cylinder/return hydraulic oil channel, and the valve rod (9) for opening/closing hydraulic oil channel is loaded on positioning groove (29) through guide sleeve (10);
Also comprise the postive stop baffle (6) being arranged on and hydraulic cylinder piston rod (7) being closed hydraulic oil channel for promoting valve rod (9).
2. oil hydraulic cylinder stop valve installation according to claim 1, it is characterized in that: the valve block (8) at described positioning groove (29) notch place is provided with dust cover (21), dust cover (21) one end is plugged in guide sleeve (10), and it is corresponding with postive stop baffle (6) that valve rod (9) passes dust cover (21);
The seal ring preventing fluid from revealing is provided with between described guide sleeve (10) and positioning groove (29), between valve rod (9) and guide sleeve (10), between valve rod (9) and dust cover (21).
3. oil hydraulic cylinder stop valve installation according to claim 2, it is characterized in that: described positioning groove (29) is stepped groove, comprise small stair portion (19) connected successively, middle stepped part (30), large stepped part (20); Valve rod (9) is stepped shape, comprises stub end and little head end, and be Spielpassung between the stub end of small stair portion (19) and valve rod (9), gap is 0.038 ~ 0.06mm.
4. oil hydraulic cylinder stop valve installation according to claim 3, is characterized in that: described oil duct (5) is connected with middle stepped part (30); Valve block (8) between described hydraulic fluid port two (3) and positioning groove (29) is provided with transition groove (31).
5. oil hydraulic cylinder stop valve installation according to claim 3, it is characterized in that: be provided with flange one (32) in the middle part of described guide sleeve (10) outer wall, guide sleeve (10) one end is stretched into middle stepped part (30), is stuck in the large stepped part (20) of positioning groove (29) through flange one (32); Guide sleeve (10) inwall is provided with the flange two (33) for the valve head of spacing valve rod (9); Be Spielpassung between guide sleeve (10) outer wall and middle stepped part (30), the guide sleeve (10) stretching into middle stepped part (30) has drain tap (12), the diameter of phi=0.5 ~ 1.5mm of drain tap (12).
6. oil hydraulic cylinder stop valve installation according to claim 5, is characterized in that: described seal ring comprises being positioned between guide sleeve (10) and positioning groove (29) and is provided with O type circle one, O type circle back-up ring;
Be provided with y-type seal ring (17) between valve rod (9) and guide sleeve (10), y-type seal ring (17) is positioned between flange two (33) and dust cover (21);
O type circle two (16), dust ring (18) is provided with between valve rod (9) and dust cover (21);
The stub end of described valve rod (9) is equipped with seal ring (13), the little head end of valve rod (9) is successively through flange two (33), y-type seal ring (17), O type circle two (16), dust ring (18); Gap between described guide sleeve (10) and large stepped part (20) is 0.027 ~ 0.043mm.
7. oil hydraulic cylinder stop valve installation according to claim 2, is characterized in that: the surface roughness value of described positioning groove (29) inwall is not more than Ra0.8; Small stair portion (19) and middle stepped part (30) joint are provided with chamfering one, angle [alpha]=50 of chamfering one ° ~ 70 °, the length l=2 ~ 3mm of chamfering one, chamfer radius R=3 ~ 5mm;
Large stepped part (20) outer end is provided with chamfering two, angle beta=50 of chamfering two ° ~ 70 °, the length d=2 ~ 3mm of chamfering two, chamfer radius r=2 ~ 3mm;
The stub end both sides of described valve rod (9) are respectively equipped with chamfering three, chamfer radius r '=0.5 ~ 1.5mm;
The surface roughness value of the little head end cylindrical of described valve rod (9) is not more than Ra0.8, and little head end end face is provided with bevelling γ, γ=15 ° ~ 20 °, the length L=3 ~ 5mm of bevelling, chamfer radius R '=3 ~ 5mm.
8. oil hydraulic cylinder stop valve installation according to claim 1, is characterized in that: described postive stop baffle (6) is active open circle, and the opening of active open circle is equipped with the wing nut (23) for clamping/unclamping piston rod (7).
9. one kind is equipped with the oil hydraulic cylinder of stop valve installation described in claim 1, comprise cylinder barrel (27), piston rod (7), piston (26), it is characterized in that: also comprise a stop valve installation, described stop valve installation comprises the valve block (8) be positioned on Barrel of Hydraulic Cylinders (27); Valve block (8) is respectively equipped with for the hydraulic fluid port two (3) of hydraulic fluid port one (4) cooperating that Barrel of Hydraulic Cylinders is connected with rod chamber (2), positioning groove (29), oil duct (5) for being connected with rodless cavity (1), hydraulic fluid port two (3) to be connected with oil duct (5) through positioning groove (29) and to form the entering of oil hydraulic cylinder/return hydraulic oil channel, and the valve rod (9) for opening/closing hydraulic oil channel is loaded on positioning groove (29) through guide sleeve (10); Also comprise the postive stop baffle (6) being arranged on and hydraulic cylinder piston rod (7) being closed hydraulic oil channel for promoting valve rod (9).
10. oil hydraulic cylinder according to claim 9, is characterized in that: described cylinder barrel (27) corresponding rod chamber (2) place is provided with hydraulic fluid port one (4); Described cylinder barrel (27) corresponding rodless cavity (1) place is provided with hydraulic fluid port three, and hydraulic fluid port two (3) is connected with hydraulic fluid port three by oil duct (5), oil pipe;
Described valve block (8) is loaded on one end of the upper corresponding rod chamber of cylinder barrel (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410656705.9A CN104776081A (en) | 2014-11-18 | 2014-11-18 | Hydraulic cylinder stop valve device and hydraulic cylinder fitted with device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410656705.9A CN104776081A (en) | 2014-11-18 | 2014-11-18 | Hydraulic cylinder stop valve device and hydraulic cylinder fitted with device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104776081A true CN104776081A (en) | 2015-07-15 |
Family
ID=53617757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410656705.9A Pending CN104776081A (en) | 2014-11-18 | 2014-11-18 | Hydraulic cylinder stop valve device and hydraulic cylinder fitted with device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104776081A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3972265A (en) * | 1973-08-02 | 1976-08-03 | Bruning Company | Stroke control device |
| US4151978A (en) * | 1976-07-29 | 1979-05-01 | George Senegal | Stroke limiting apparatus for hydraulic cylinders |
| CN203685768U (en) * | 2013-12-30 | 2014-07-02 | 焦作市中德液压机械有限公司 | Self-locking hydraulic cylinder |
| CN204239375U (en) * | 2014-11-18 | 2015-04-01 | 湖北江山液压科技有限公司 | A kind of oil hydraulic cylinder stop valve installation and the oil hydraulic cylinder of this device is housed |
-
2014
- 2014-11-18 CN CN201410656705.9A patent/CN104776081A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3972265A (en) * | 1973-08-02 | 1976-08-03 | Bruning Company | Stroke control device |
| US4151978A (en) * | 1976-07-29 | 1979-05-01 | George Senegal | Stroke limiting apparatus for hydraulic cylinders |
| CN203685768U (en) * | 2013-12-30 | 2014-07-02 | 焦作市中德液压机械有限公司 | Self-locking hydraulic cylinder |
| CN204239375U (en) * | 2014-11-18 | 2015-04-01 | 湖北江山液压科技有限公司 | A kind of oil hydraulic cylinder stop valve installation and the oil hydraulic cylinder of this device is housed |
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| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150715 |
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| WD01 | Invention patent application deemed withdrawn after publication |