CN104405715A - Two-speed hydraulic cylinder and lifting mechanism applying same - Google Patents
Two-speed hydraulic cylinder and lifting mechanism applying same Download PDFInfo
- Publication number
- CN104405715A CN104405715A CN201410548977.7A CN201410548977A CN104405715A CN 104405715 A CN104405715 A CN 104405715A CN 201410548977 A CN201410548977 A CN 201410548977A CN 104405715 A CN104405715 A CN 104405715A
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- China
- Prior art keywords
- hole
- valve rod
- oil
- hydraulic cylinder
- oil hydraulic
- 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.)
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Classifications
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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
- F15B15/224—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston which closes off fluid outlets in the cylinder bore by its own movement
-
- 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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
-
- 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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
Abstract
The invention provides a two-speed hydraulic cylinder and a lifting mechanism applying the same. The invention relates to the two-speed hydraulic cylinder and the lifting mechanism, wherein the hydraulic cylinder comprises a cylinder body and a piston movably arranged in the cylinder body; an oil channel, a fast hole and a damping hole are arranged at the bottom of the cylinder body; the oil channel is used for being communicated with an external oil way; the cylinder body comprises a motion chamber for allowing the piston to do piston motion; the two ends of the fast hole and the two ends of the damping hole are communicated with the oil channel and the motion chamber respectively; the end of the fast hole, which has a large diameter, is communicated with the motion chamber; the hydraulic cylinder further comprises a limit valve rod and an elastic piece, and the limit valve rod is opposite to the fast hole; the end, accommodated in the motion chamber, of the limit valve rod is provided with a blind hole; the elastic piece and part of the limit valve rod are accommodated in the blind hole; and the other part of the limit valve rod extends out of the blind hole under the elastic action of the elastic piece. During the oil return process of the hydraulic cylinder, when the limit valve rod is not propped against the fast hole, the hydraulic cylinder returns oil simultaneously through a fast channel and a slow channel, and when the limit valve rod is propped against and seal the fast hole, the hydraulic cylinder returns oil only through the slow channel.
Description
Technical field
The present invention relates to a kind of two step velocity oil hydraulic cylinders, particularly relate to a kind of two step velocity oil hydraulic cylinders be applied on elevator mechanism.
Background technique
The oil hydraulic cylinder for providing lifting drive to elevator mechanism is all comprised elevator mechanism (as wagon jack).Oil hydraulic cylinder conventional at present enters with the process resetted in its work, and the motion speed of piston rod is all generally constant, and namely piston rod only possesses the ability that single speed is run.Therefore, on elevator mechanism needs, half way declines fast, and during lower half way descending at slow speed, needs could realize by additional external throttling switching device.
But it is more complicated by what make the hydraulic system of elevator mechanism and mechanical system become to increase additional external throttling switching device, needs to occupy larger space simultaneously.
Summary of the invention
In view of this, the invention provides the one not only simple and simple two step velocity oil hydraulic cylinders of mechanical structure of hydraulic structure.
The present invention also provides a kind of elevator mechanism applying above-mentioned two step velocity oil hydraulic cylinders.
A kind of two step velocity oil hydraulic cylinders, the piston comprising cylinder body and be located at movably in this cylinder body, the bottom of this cylinder body is provided with oily passage, fast hole and damping hole, oil passage is used for being communicated with outside oil circuit, this cylinder body comprises the movable chamber of doing piston movement for this piston, and passage oily with this and this movable chamber are communicated with respectively at the two ends of this quick hole and this damping hole; This two step velocitys oil hydraulic cylinder also comprises the spacing valve rod and elastic component that quick hole with this is oppositely arranged, one end that this piston is placed in this movable chamber offers blind hole, the part of this elastic component and this spacing valve rod is placed in this blind hole, and another part of this spacing valve rod stretches out this blind hole and arranges under the elastic force effect of this elastic component; In the process of this two step velocitys oil hydraulic cylinder oil return, when this spacing valve rod does not conflict this quick hole, this two step velocitys oil hydraulic cylinder is simultaneously by the express passway be made up of this oily passage and this quick hole and the slow path oil return be made up of this oily passage and this damping hole; When this spacing valve rod conflict and this quick hole of involution time, this two step velocitys oil hydraulic cylinder is by means of only this slow path oil return.
Preferably, the aperture in described quick hole is greater than the aperture of this damping hole.
Preferably, one end of described spacing valve rod and this elastic component support to compress this elastic component, and described one end of this spacing valve rod is provided with limited part, one end that this limited part and this blind hole are provided with opening supports to prevent this spacing valve rod under the elastic force effect of this elastic component, departing from this blind hole.
Preferably, the other end of described spacing valve rod is provided with a sealing surface be oppositely arranged with this quick hole, and sealing face is used for this quick hole of involution.
Preferably, described two step velocity oil hydraulic cylinders also comprise one-way valve, the bottom of this cylinder body is also provided with the oil inlet hole being communicated with this oily passage and this movable chamber, and this one-way valve is located between this oily passage and oil inlet hole, and this one-way valve is used for closing this oil inlet hole when this two step velocitys oil hydraulic cylinder oil return.
A kind of elevator mechanism, comprise bearing table and the two step velocity oil hydraulic cylinders for being elevated this bearing table, the piston that this two step velocitys oil hydraulic cylinder comprises cylinder body and is located at movably in this cylinder body, the bottom of this cylinder body is provided with oily passage, fast hole and damping hole, oil passage is used for being communicated with outside oil circuit, this cylinder body comprises the movable chamber of doing piston movement for this piston, and the two ends of this quick hole and this damping hole are communicated with in passage oily with this and this movable chamber respectively; This two step velocitys oil hydraulic cylinder also comprises the spacing valve rod and elastic component that quick hole with this is oppositely arranged, one end that this piston is placed in this movable chamber offers blind hole, the part of this elastic component and this spacing valve rod is placed in this blind hole, and another part of this spacing valve rod stretches out this blind hole and arranges under the elastic force effect of this elastic component; In the process of this two step velocitys oil hydraulic cylinder oil return, when this spacing valve rod does not conflict this quick hole, this two step velocitys oil hydraulic cylinder is simultaneously by the express passway be made up of this oily passage and this quick hole and the slow path oil return be made up of this oily passage and this damping hole; When this spacing valve rod conflict and this quick hole of involution time, this two step velocitys oil hydraulic cylinder is by means of only this slow path oil return.
Preferably, the aperture in described quick hole is greater than the aperture of this damping hole.
Preferably, one end of described spacing valve rod and this elastic component support to compress this elastic component, and described one end of this spacing valve rod is provided with limited part, one end that this limited part and this blind hole are provided with opening supports to prevent this spacing valve rod under the elastic force effect of this elastic component, departing from this blind hole.
Preferably, the other end of described spacing valve rod is provided with a sealing surface be oppositely arranged with this quick hole, and sealing face is used for this quick hole of involution.
Preferably, described two step velocity oil hydraulic cylinders also comprise one-way valve, the bottom of this cylinder body is also provided with the oil inlet hole being communicated with this oily passage and this movable chamber, and this one-way valve is located between this oily passage and oil inlet hole, and this one-way valve is used for closing this oil inlet hole when this two step velocitys oil hydraulic cylinder oil return.
The present invention has following beneficial effect:
Throttle valve is combined with oil hydraulic cylinder by above-mentioned two step velocity oil hydraulic cylinders, makes it design in cylinder interior, and by switching oil hydraulic cylinder drainback passage, changing channel cross-sectional area, carrying out the motion speed of control piston; Half way on oil cylinder, express passway (large aperture oil circuit) and slow path (small aperture oil circuit) oil return simultaneously, piston reset speed block, after piston moves to spacing valve rod closedown express passway, hydraulic oil is by slow path oil return, piston slow running, thus achieve the switching of hydraulic cylinder piston rod Recovery Process speed; And by change spacing valve rod length also adjusting piston speed switch travel position.Apply the elevator mechanism of above-mentioned two step velocity oil hydraulic cylinders in addition in the process used; when bearing table can reduce close to its motion speed during base; thus decrease its impact to base and bar linkage structure; and then improve the working life of elevator mechanism, and the object avoiding impact and damage on bearing table and the safety protecting operator.
Accompanying drawing explanation
Fig. 1 is the stereogram that two step velocity oil hydraulic cylinders of present pre-ferred embodiments are applied to elevator mechanism;
Fig. 2 is the stereogram of two step velocity oil hydraulic cylinders of present pre-ferred embodiments;
Fig. 3 is the partial enlarged drawing of the note of circle shown in Fig. 2 part A;
Fig. 4 is the using state figure of two step velocity oil hydraulic cylinders described in Fig. 2;
Fig. 5 is another using state figure of two step velocity oil hydraulic cylinders described in Fig. 2.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Refer to Fig. 1, the embodiment of the present invention provides a kind of elevator mechanism 100, comprise the base 20 that bearing table 10, relatively bearing table 10 arrange, the bar linkage structure 30 connecting bearing table 10 and base 20 and two ends respectively with base 20 and the hinged two step velocity oil hydraulic cylinders 40 of bar linkage structure 30.Bearing table 10 for carrying object to be elevated, as vehicle.Bar linkage structure 30 is roughly in " X " type, and its upper end part is flexibly connected with bearing table 10 with bearing table 10 hinge portion, and end portion is hinged with base 20 and be partly flexibly connected with base 20, with the ability making bearing table 10 possess respect thereto 20 lifting.As long as be appreciated that the ability that bearing table 10 can be made to possess respect thereto 20 lifting, bar linkage structure 30 can also be other structures such as parallelogram.Two step velocity oil hydraulic cylinders 40 provide power for giving the lifting of bearing table 10.
See also Fig. 2-5, two step velocity oil hydraulic cylinder 40 to comprise cylinder body 41 and be located at the piston 43 in cylinder body 41 movably.The bottom of cylinder body 41 is provided with oily passage 412, fast hole 414 and damping hole 416 for being communicated with outside oil circuit, cylinder body 41 is also provided with the movable chamber 418 of doing piston movement for piston 43, the two ends of quick hole 414 and damping hole 416 are communicated with oily passage 412 and movable chamber 418 respectively, and oily passage 412 and quick hole 414 form one jointly for the express passway of quick oil return, and oily passage 412 and damping hole 416 are common forms one for the slow path of oil return at a slow speed.Wherein, the aperture in quick hole 414 is greater than the aperture of damping hole 416.
Two step velocity oil hydraulic cylinders 40 also comprise the spacing valve rod 45 and elastic component 47 that are oppositely arranged with quick hole 414.One end that piston 43 is placed in movable chamber 418 offers blind hole 431, and the part of elastic component 47 and spacing valve rod 45 is placed in blind hole 431, and another part of spacing valve rod 45 stretches out blind hole 431 and arranges under the elastic force effect of elastic component 47.Concrete, one end of spacing valve rod 45 and elastic component 47 support with compression elastic piece 47, and described one end of spacing valve rod 45 is provided with limited part 452, one end that limited part 452 and blind hole 431 are provided with opening supports to prevent limited valve bar 45 under the elastic force effect of elastic component 47, departing from blind hole 431.The other end of spacing valve rod 45 is provided with a sealing surface 453 be oppositely arranged with quick hole 414, and sealing surface 453 is for the quick hole 414 of involution.In the process of two step velocity oil hydraulic cylinder 40 oil returns, when spacing valve rod 45 does not conflict quick hole 414, two step velocity oil hydraulic cylinders 40 are simultaneously by express passway and slow path oil return; When spacing valve rod 45 conflict and involution quick hole 414 time, two step velocity oil hydraulic cylinders 40 are by means of only slow path oil return.
Two step velocity oil hydraulic cylinders 40 also comprise one-way valve 49, the bottom of cylinder body 41 is also provided with the oil inlet hole 419 being communicated with oily passage 412 and movable chamber 418, one-way valve 49 is located between oily passage 412 and oil inlet hole 419, and one-way valve 49 is for closing oil inlet hole 419 when two step velocity oil hydraulic cylinder 40 oil returns.
Throttle valve is combined with oil hydraulic cylinder by above-mentioned two step velocity oil hydraulic cylinders 40, makes it design at cylinder body 41 inner, and by switching oil hydraulic cylinder 41 drainback passage, changing channel cross-sectional area, carrying out the motion speed of control piston 43; Half way on oil cylinder, express passway (large aperture oil circuit) and slow path (small aperture oil circuit) oil return simultaneously, piston 43 reset speed is fast, when piston 43 moves to after spacing valve rod 45 closes express passway, hydraulic oil is by slow path oil return, piston 43 slow running, thus achieve the switching of hydraulic cylinder piston rod Recovery Process speed; And by change spacing valve rod 45 length also adjusting piston 43 speed switch travel position.Apply the elevator mechanism 100 of above-mentioned two step velocity oil hydraulic cylinders 40 in addition in the process used; when bearing table 10 can reduce close to its motion speed during base 20; thus decrease its impact to base 20 and bar linkage structure 30; and then improve the working life of elevator mechanism 100, and the object avoiding impact and damage on bearing table and the safety protecting operator.
When being appreciated that as preventing oil return, damping hole 416 is blocked, and two step velocity oil hydraulic cylinders 40 can also comprise filter screen 48, and filter screen 48 is located at damping hole 416 place.
The foregoing is only preferred embodiment of the present invention, be not limited to the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a step velocity oil hydraulic cylinder, the piston comprising cylinder body and be located at movably in this cylinder body, it is characterized in that, the bottom of this cylinder body is provided with oily passage, fast hole and damping hole, oil passage is used for being communicated with outside oil circuit, this cylinder body comprises the movable chamber of doing piston movement for this piston, and the two ends of this quick hole and this damping hole are communicated with in passage oily with this and this movable chamber respectively; This two step velocitys oil hydraulic cylinder also comprises the spacing valve rod and elastic component that quick hole with this is oppositely arranged, one end that this piston is placed in this movable chamber offers blind hole, the part of this elastic component and this spacing valve rod is placed in this blind hole, and another part of this spacing valve rod stretches out this blind hole and arranges under the elastic force effect of this elastic component; In the process of this two step velocitys oil hydraulic cylinder oil return, when this spacing valve rod does not conflict this quick hole, this two step velocitys oil hydraulic cylinder is simultaneously by the express passway be made up of this oily passage and this quick hole and the slow path oil return be made up of this oily passage and this damping hole; When this spacing valve rod conflict and this quick hole of involution time, this two step velocitys oil hydraulic cylinder is by means of only this slow path oil return.
2. a kind of two step velocity oil hydraulic cylinders according to claim 1, is characterized in that: the aperture in this quick hole is greater than the aperture of this damping hole.
3. a kind of two step velocity oil hydraulic cylinders according to claim 1, it is characterized in that: one end of this spacing valve rod and this elastic component support to compress this elastic component, and described one end of this spacing valve rod is provided with limited part, one end that this limited part and this blind hole are provided with opening supports to prevent this spacing valve rod under the elastic force effect of this elastic component, departing from this blind hole.
4. a kind of two step velocity oil hydraulic cylinders according to claim 3, is characterized in that: the other end of this spacing valve rod is provided with a sealing surface be oppositely arranged with this quick hole, and sealing face is used for this quick hole of involution.
5. a kind of two step velocity oil hydraulic cylinders according to claim 1, it is characterized in that: this two step velocitys oil hydraulic cylinder also comprises one-way valve, the bottom of this cylinder body is also provided with the oil inlet hole being communicated with this oily passage and this movable chamber, this one-way valve is located between this oily passage and oil inlet hole, and this one-way valve is used for closing this oil inlet hole when this two step velocitys oil hydraulic cylinder oil return.
6. an elevator mechanism, comprise bearing table and the two step velocity oil hydraulic cylinders for being elevated this bearing table, the piston that this two step velocitys oil hydraulic cylinder comprises cylinder body and is located at movably in this cylinder body, it is characterized in that, the bottom of this cylinder body is provided with oily passage, fast hole and damping hole, oil passage is used for being communicated with outside oil circuit, and this cylinder body comprises the movable chamber of doing piston movement for this piston, and passage oily with this and this movable chamber are communicated with respectively at the two ends of this quick hole and this damping hole; This two step velocitys oil hydraulic cylinder also comprises the spacing valve rod and elastic component that quick hole with this is oppositely arranged, one end that this piston is placed in this movable chamber offers blind hole, the part of this elastic component and this spacing valve rod is placed in this blind hole, and another part of this spacing valve rod stretches out this blind hole and arranges under the elastic force effect of this elastic component; In the process of this two step velocitys oil hydraulic cylinder oil return, when this spacing valve rod does not conflict this quick hole, this two step velocitys oil hydraulic cylinder is simultaneously by the express passway be made up of this oily passage and this quick hole and the slow path oil return be made up of this oily passage and this damping hole; When this spacing valve rod conflict and this quick hole of involution time, this two step velocitys oil hydraulic cylinder is by means of only this slow path oil return.
7. a kind of elevator mechanism according to claim 6, is characterized in that: the aperture in this quick hole is greater than the aperture of this damping hole.
8. a kind of elevator mechanism according to claim 6, it is characterized in that: one end of this spacing valve rod and this elastic component support to compress this elastic component, and described one end of this spacing valve rod is provided with limited part, one end that this limited part and this blind hole are provided with opening supports to prevent this spacing valve rod under the elastic force effect of this elastic component, departing from this blind hole.
9. a kind of elevator mechanism according to claim 8, is characterized in that: the other end of this spacing valve rod is provided with a sealing surface be oppositely arranged with this quick hole, and sealing face is used for this quick hole of involution.
10. a kind of elevator mechanism according to claim 6, it is characterized in that: this two step velocitys oil hydraulic cylinder also comprises one-way valve, the bottom of this cylinder body is also provided with the oil inlet hole being communicated with this oily passage and this movable chamber, this one-way valve is located between this oily passage and oil inlet hole, and this one-way valve is used for closing this oil inlet hole when this two step velocitys oil hydraulic cylinder oil return.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410548977.7A CN104405715B (en) | 2014-10-16 | 2014-10-16 | Two-stage speed hydro-cylinder and apply the hoisting appliance of this two-stage speed hydro-cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410548977.7A CN104405715B (en) | 2014-10-16 | 2014-10-16 | Two-stage speed hydro-cylinder and apply the hoisting appliance of this two-stage speed hydro-cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104405715A true CN104405715A (en) | 2015-03-11 |
| CN104405715B CN104405715B (en) | 2016-06-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410548977.7A Active CN104405715B (en) | 2014-10-16 | 2014-10-16 | Two-stage speed hydro-cylinder and apply the hoisting appliance of this two-stage speed hydro-cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104405715B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219440A (en) * | 2015-12-15 | 2016-12-14 | 严金龙 | A kind of hydraulically extensible cylinder |
| CN109595220A (en) * | 2018-12-21 | 2019-04-09 | 中船重工中南装备有限责任公司 | A kind of Slow Close hydraulic cylinder |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB950060A (en) * | 1959-06-24 | 1964-02-19 | Plessey Co Ltd | Improvements in or relating to ram-type actuating mechanisms |
| CN2700305Y (en) * | 2004-04-01 | 2005-05-18 | 中国工程物理研究院机械制造工艺研究所 | Scissor-fork type hand driven hydraulic elevator |
| RO123079B1 (en) * | 2007-01-18 | 2010-09-30 | Inoe 2000 - Institutul De Cercetări Pentru Hidraulică Şi Pneumatică | Hydraulic cylinder for pressing |
| CN103573749A (en) * | 2013-11-04 | 2014-02-12 | 湖南特力液压有限公司 | Hydraulic buffer cylinder |
| CN204226328U (en) * | 2014-10-16 | 2015-03-25 | 江苏海力达机电制造有限公司 | Two step velocity oil hydraulic cylinders and apply the elevator mechanism of this two step velocitys oil hydraulic cylinder |
-
2014
- 2014-10-16 CN CN201410548977.7A patent/CN104405715B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB950060A (en) * | 1959-06-24 | 1964-02-19 | Plessey Co Ltd | Improvements in or relating to ram-type actuating mechanisms |
| CN2700305Y (en) * | 2004-04-01 | 2005-05-18 | 中国工程物理研究院机械制造工艺研究所 | Scissor-fork type hand driven hydraulic elevator |
| RO123079B1 (en) * | 2007-01-18 | 2010-09-30 | Inoe 2000 - Institutul De Cercetări Pentru Hidraulică Şi Pneumatică | Hydraulic cylinder for pressing |
| CN103573749A (en) * | 2013-11-04 | 2014-02-12 | 湖南特力液压有限公司 | Hydraulic buffer cylinder |
| CN204226328U (en) * | 2014-10-16 | 2015-03-25 | 江苏海力达机电制造有限公司 | Two step velocity oil hydraulic cylinders and apply the elevator mechanism of this two step velocitys oil hydraulic cylinder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219440A (en) * | 2015-12-15 | 2016-12-14 | 严金龙 | A kind of hydraulically extensible cylinder |
| CN109595220A (en) * | 2018-12-21 | 2019-04-09 | 中船重工中南装备有限责任公司 | A kind of Slow Close hydraulic cylinder |
| CN109595220B (en) * | 2018-12-21 | 2023-12-05 | 中船重工中南装备有限责任公司 | Slowly-closed hydraulic cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104405715B (en) | 2016-06-01 |
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