CN113847376A - Damping hydraulic cylinder - Google Patents
Damping hydraulic cylinder Download PDFInfo
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- CN113847376A CN113847376A CN202111059886.3A CN202111059886A CN113847376A CN 113847376 A CN113847376 A CN 113847376A CN 202111059886 A CN202111059886 A CN 202111059886A CN 113847376 A CN113847376 A CN 113847376A
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- Prior art keywords
- damping
- cylinder
- oil
- cylinder body
- cavity
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
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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
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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
- F15B15/226—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having elastic elements, e.g. springs, rubber pads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/362—Combination of sealing and guide arrangements for piston rods
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a damping hydraulic cylinder which comprises a damping cylinder body, wherein the damping cylinder comprises a cylinder body I, a piston I and a piston rod I are arranged in the cylinder body I, the piston and the piston rod divide the cylinder body I into a rodless cavity I and a rod cavity I, a balance cylinder is connected onto the damping cylinder and comprises a cylinder body II, a piston II and a piston rod II are arranged in the cylinder body II, the cylinder body II is divided into a rodless cavity II and a rod cavity II by the piston II and the piston rod II, an elastic part is connected between the piston II and the cylinder body II, the rod cavity II is communicated with outside air, the rodless cavity I is communicated with the rodless cavity II through a damping oil path, a communicating oil path for communicating the rodless cavity I with the rod cavity I is formed on the cylinder body I, and a closed oil cavity is formed between the rodless cavity I, the rod cavity I, the damping oil path and the communicating oil path. Through the mode, the damping hydraulic cylinder disclosed by the invention can avoid the pressure imbalance of the oil cavity caused by the back pressure problem, and maintain the stable buffering.
Description
Technical Field
The invention relates to the field of cylinders, in particular to a damping hydraulic cylinder for a cylinder.
Background
In pneumatic automation systems, vibration and shock phenomena are frequent. A cylinder moving at high speed generates a large impact force at the end of the stroke. In order to prevent the cylinder piston from striking the cylinder head at the end of travel, a damping device is generally provided.
The hydraulic damper can convert more than 90% of impact energy into oil heat energy through throttling absorption and dissipate the oil heat energy, and the buffering efficiency and the attenuation coefficient are greatly improved compared with those of the traditional damper.
The most common hydraulic damper at present is to add a damping pipeline between two cavities, or add a flow regulating valve on a connecting oil pipe, and realize the damping effect through hydraulic oil or the flow regulating valve; or the hydraulic damping is arranged in the load cylinder, and the damping hole is arranged inside the load cylinder to achieve the buffering effect.
Traditional hydraulic damper buffering effect is poor, and the buffering is not steady in the easy backpressure appearance that produces of buffering in-process, and the structure is complicated, installation maintenance cost is high, easy oil leak, and life is shorter.
Disclosure of Invention
The invention mainly solves the technical problem of providing a damping hydraulic cylinder, which can avoid the pressure imbalance of an oil cavity caused by the back pressure problem and maintain the stable buffering.
In order to solve the technical problems, the invention adopts a technical scheme that: the damping hydraulic cylinder comprises a damping cylinder body I, wherein a piston I and a piston rod I are arranged in the cylinder body I, the piston and the piston rod divide the cylinder body I into a rodless cavity I and a rod cavity I, a balance cylinder is connected to the damping cylinder and comprises a cylinder body II, a piston II and a piston rod II are arranged in the cylinder body II, the piston II and the piston rod II divide the cylinder body II into a rodless cavity II and a rod cavity II, an elastic part is connected between the piston II and the cylinder body II, the rod cavity II is communicated with outside air, the rodless cavity I is communicated with the rodless cavity II through a damping oil way, a communicating oil way for communicating the rodless cavity I with the rod cavity I is formed in the cylinder body I, and a closed oil cavity is formed between the rodless cavity I, the rod cavity I, the damping oil way, the communicating oil way and the rodless cavity II.
In a preferred embodiment of the invention, the cylinder body comprises a cylinder barrel I and a front end cover and a rear end cover which are arranged at two ends of the cylinder barrel I, the front end cover and the rear end cover are correspondingly provided with a front valve seat and a rear valve seat, the front end cover and the front valve seat as well as the rear end cover and the rear valve seat are provided with oil through holes, a hollow damping pipe is connected between the front valve seat and the rear valve seat, and the oil through hole is formed by communicating the damping pipe with the oil through hole.
In a preferred embodiment of the present invention, the damping tube has an inner diameter larger than that of the oil passing hole.
In a preferred embodiment of the present invention, the second cylinder block is connected to the right end of the rear end cover, and the damping oil path is a damping hole formed in the rear end cover.
In a preferred embodiment of the present invention, a flow regulating valve for regulating a flow rate is mounted on the front valve seat, the flow regulating valve is communicated with the communicating oil path, an exhaust port communicated with the communicating oil path is mounted on the rear valve seat, and an exhaust pressure measuring connector is arranged on the exhaust port.
In a preferred embodiment of the present invention, the front end cover is provided with a first oil filling port capable of being closed or opened, and the first oil filling port is communicated with the first rod cavity.
In a preferred embodiment of the invention, a first gland is further mounted at the left end of the front end cover, the inner side of the first gland is in threaded connection with the guide sleeve, the first piston rod is in dynamic sealing connection with the guide sleeve, and the first gland, the front end cover, the first cylinder barrel and the rear end cover are in fastening connection through a first pull rod.
In a preferred embodiment of the invention, the second cylinder body is provided with a vent hole, the vent hole is communicated with the second rod cavity, and the vent hole is provided with a silencer.
In a preferred embodiment of the present invention, the second cylinder body is provided with a second oil filling port capable of being closed or opened, and the second oil filling port is communicated with the second rodless cavity.
In a preferred embodiment of the invention, the second cylinder body comprises a second cylinder barrel, the left end of the second cylinder barrel is connected to the rear end cover of the first cylinder body, a second pressing cover is installed at the right end of the second cylinder barrel, the second cylinder barrel and the second pressing cover are locked to the rear end cover through a second pull rod, the left end of the elastic element is connected to the second piston, and the right end of the elastic element is connected to the second pressing cover.
The invention has the beneficial effects that: the damping hydraulic cylinder disclosed by the invention can adjust the damping buffer effect, avoid the pressure imbalance of the oil cavity caused by the backpressure problem and maintain the stable buffer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural view of a preferred embodiment of a damping cylinder according to the present invention;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1;
FIG. 3 is a schematic view of a portion of the structure of FIG. 1;
FIG. 4 is an external view of the structure of FIG. 1;
FIG. 5 is a sectional view taken along line A-A of FIG. 4;
FIG. 6 is a sectional view taken along line B-B of FIG. 4;
the parts in the drawings are numbered as follows: 1. the damping cylinder comprises a damping cylinder body 101, a cylinder body I, 102, a piston I, 103, a piston rod I, 104, a rodless cavity I, 105, a rod cavity I, 106, a damping oil path, 107, a communication oil path, 108, a cylinder barrel I, 109, a front end cover, 110, a rear end cover, 111, a front valve seat, 112, a rear valve seat, 113, an oil through hole, 114, a damping pipe, 115, a flow regulating valve, 116, an exhaust port, 117, an exhaust pressure measuring connector, 118, an oil filling port I, 119, a gland I, 120, a guide sleeve, 121, a pull rod I, 2, a balance cylinder, 201, a cylinder body II, 202, a piston II, 203, a piston rod II, 204, a rodless cavity II, 205, a rod cavity II, 206, an elastic element, 207, an air port, 208, a silencer, 209, an oil filling port II, 210, a cylinder barrel II, 211, a gland II, 212 and a pull rod II.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 6, a damping hydraulic cylinder includes a damping cylinder 1, the damping cylinder 1 includes a cylinder body one 101, a piston one 102 and a piston rod one 103 are disposed in the cylinder body one 101, the cylinder body one 1 is divided into a rodless cavity one 104 and a rod cavity one 105 by the piston one 102 and the piston rod one 103, a balance cylinder 2 is connected to the damping cylinder 1, the balance cylinder 2 includes a cylinder body two 201, a piston two 202 and a piston rod two 203 are disposed in the cylinder body two 201, the cylinder body two 201 is divided into a rodless cavity two 204 and a rod cavity two 205 by the piston two 202 and the piston rod two 203, an elastic member 206 is connected between the piston two 202 and the cylinder body two 201, the rod cavity two 205 is communicated with outside air, the rodless cavity one 104 is communicated with the rodless cavity two 204 through a damping oil path 106, a communicating oil path 107 for communicating the rodless cavity one 104 with the rod cavity one 105 is disposed on the cylinder body one 101, the rodless cavity one 104 and the rod cavity one 105, and a closed oil cavity is formed among the damping oil passage 106, the communication oil passage 107 and the second rodless cavity 204. The first rodless cavity 104 is communicated with the second rodless cavity 204 through a damping oil path, when one cavity produces back pressure, the other cavity can quickly supplement oil, the pressure of each cavity in the oil cylinder is always kept consistent, and buffering is stable. Sealing rings are arranged on the first piston 102 and the second piston 202, the first piston 102 separates a first rodless cavity 104 from a first rod cavity 105 in the first cylinder 101, and the second piston 202 separates a second rodless cavity 204 from a second rod cavity 205.
In addition, the first cylinder block 101 comprises a first cylinder barrel 108, a front end cover 109 and a rear end cover 110 which are installed at two ends of the first cylinder barrel 108, a front valve seat 111 and a rear valve seat 112 are correspondingly installed on the front end cover 109 and the rear end cover 110, oil through holes 113 are formed in the front end cover 109 and the front valve seat 111 as well as the rear end cover 110 and the rear valve seat 112, a hollow damping pipe 114 is connected between the front valve seat 111 and the rear valve seat 112, and the oil through passage 107 is formed by communicating the damping pipe 114 with the oil through holes 113.
The damping pipe 114 has an inner diameter larger than that of the oil passage hole 113.
The second cylinder 201 is connected to the right end of the rear end cover 110, and the damping oil passage 106 is a damping hole formed in the rear end cover 110.
Further, a flow rate adjusting valve 115 for adjusting a flow rate is attached to the front valve seat 111, the flow rate adjusting valve 115 communicates with the communication oil passage 107, an exhaust port 116 communicating with the communication oil passage 107 is attached to the rear valve seat 112, and an exhaust pressure measuring joint 117 is provided to the exhaust port 116. The flow rate of the oil can be adjusted by the flow control valve 115, and the damping effect can be adjusted as required.
In addition, the front end cover 109 is provided with a first oil filling opening 118 which can be closed or opened, and the first oil filling opening 118 is communicated with the first rod cavity 105.
In addition, a first gland 119 is further mounted at the left end of the front end cover 109, the inner side of the first gland 119 is in threaded connection with a guide sleeve 120, a first piston rod 103 is in movable sealing connection with the guide sleeve 120 to prevent oil from leaking, the first gland 119, the front end cover 109, the first cylinder 108 and the rear end cover 110 are in fastening connection through a first pull rod 121, and the first pull rod 121 is locked on the front end cover 109 through a nut.
In addition, the second cylinder block 201 is provided with an air vent 207, the air vent 207 is communicated with the second rod cavity 205, and the air vent 207 is provided with a silencer 208.
In addition, a second oil filling port 209 capable of being closed or opened is formed in the second cylinder body 201, and the second oil filling port 209 is communicated with the second rodless cavity 204.
In addition, the second cylinder 201 comprises a second cylinder 210, the left end of the second cylinder 210 is connected to the rear end cover 110 of the first cylinder 101, the right end of the second cylinder 210 is provided with a second gland 211, the second cylinder 210 and the second gland 211 are locked on the rear end cover 110 through a second pull rod 212, the left end of the elastic element (spring) 206 is connected to the second piston 202, and the right end of the elastic element is connected to the second gland 211.
The damping hydraulic cylinder has the following specific working principle: before use, the second piston rod 203 is pulled through external force to compress the elastic piece 206, the elastic force is the same as the load force by controlling the compression amount of the elastic piece 206, the first oil filling port 118 and the second oil filling port 209 start oil feeding, gas in the damping hydraulic cylinder is completely discharged through the exhaust pressure measuring connector 117 in the oil filling process, and after the oil is filled, the first oil filling port 118 and the second oil filling port 209 are plugged by a screw plug, so that a closed oil cavity is formed among the first rodless cavity 104, the first rod cavity 105, the damping oil circuit 106, the communicating oil circuit 107 and the second rodless cavity 204;
when the damping device is used, an external load is connected to the first piston rod 103, the first piston rod 103 is pulled to extend out by the external load, oil in the first rod cavity 105 enters the first rodless cavity 104 through the flow regulating valve 115 and the damping pipe 114 in sequence, and at the moment, the pressure of the first rod cavity 105 and the pressure of the first rodless cavity 104 are unbalanced, and the oil in the second rodless cavity 204 enters the first rodless cavity 104 through the damping oil way 106, so that the pressure balance of the first rod cavity 105 and the first rodless cavity 104 is ensured, and the buffering is ensured to be stable; when the external load pushes the first piston rod 103 to retract, oil in the first rodless cavity 104 enters the second rodless cavity 204 through the damping oil path 106, so that pressure balance between the first rod cavity 105 and the first rodless cavity 104 is guaranteed, and stable buffering is guaranteed.
Different from the prior art, the damping hydraulic cylinder disclosed by the invention can adjust the damping buffering effect, avoid the pressure imbalance of the oil cavity caused by the backpressure problem and maintain the stable buffering.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A damping hydraulic cylinder comprises a damping cylinder body I, a piston I and a piston rod I are arranged in the cylinder body I, the piston and the piston rod divide the cylinder body into a rodless cavity I and a rod cavity I, it is characterized in that the damping cylinder is connected with a balance cylinder, the balance cylinder comprises a cylinder body II, a piston II and a piston rod II are arranged in the cylinder body II, the second piston and the second piston rod divide the second cylinder body into a second rodless cavity and a second rod cavity, an elastic part is connected between the second piston and the second cylinder body, the rod cavity II is communicated with the outside air, the rodless cavity I is communicated with the rodless cavity II through a damping oil path, and a communicating oil path for communicating the first rodless cavity with the first rod cavity is formed in the first cylinder body, and a closed oil cavity is formed among the first rodless cavity, the first rod cavity, the damping oil path, the communicating oil path and the second rodless cavity.
2. The damping hydraulic cylinder according to claim 1, wherein the cylinder body I comprises a cylinder barrel I, and a front end cover and a rear end cover which are arranged at two ends of the cylinder barrel I, a front valve seat and a rear valve seat are correspondingly arranged on the front end cover and the rear end cover, oil through holes are formed in the front end cover and the front valve seat, and the rear end cover and the rear valve seat, a hollow damping pipe is connected between the front valve seat and the rear valve seat, and the oil through hole is formed by communicating the damping pipe with the oil through holes.
3. The damped hydraulic cylinder of claim 2 wherein the damping tube has an inner diameter greater than an inner diameter of the oil through bore.
4. The damping hydraulic cylinder according to claim 3, wherein the second cylinder body is connected to the right end of the rear end cover, and the damping oil path is a damping hole formed in the rear end cover.
5. The damping hydraulic cylinder according to claim 4, wherein a flow regulating valve for regulating flow is mounted on the front valve seat, the flow regulating valve is communicated with the communication oil passage, and an exhaust port communicated with the communication oil passage is mounted on the rear valve seat, and an exhaust pressure measuring joint is arranged on the exhaust port.
6. The damping hydraulic cylinder as claimed in claim 5, wherein the front end cover is provided with a first oil charging port which can be closed or opened, and the first oil charging port is communicated with the first rod cavity.
7. The damping hydraulic cylinder as claimed in claim 6, wherein a first gland is further mounted at the left end of the front end cover, the inner side of the first gland is in threaded connection with the guide sleeve, the first piston rod is in dynamic sealing connection with the guide sleeve, and the first gland, the front end cover, the first cylinder barrel and the rear end cover are in fastening connection through a first pull rod.
8. The damping hydraulic cylinder according to any one of claims 1 to 7, wherein a vent hole is formed in the second cylinder body, the vent hole is communicated with the second rod cavity, and a muffler is mounted on the vent hole.
9. The damping hydraulic cylinder according to claim 8, wherein a second oil charging port which can be closed or opened is formed in the second cylinder body, and the second oil charging port is communicated with the second rodless cavity.
10. The damping hydraulic cylinder according to claim 9, wherein the second cylinder body comprises a second cylinder barrel, the left end of the second cylinder barrel is connected to the rear end cover of the first cylinder body, a second gland is mounted at the right end of the second cylinder barrel, the second cylinder barrel and the second gland are locked to the rear end cover through a second pull rod, the left end of the elastic member is connected to the second piston, and the right end of the elastic member is connected to the second gland.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111059886.3A CN113847376B (en) | 2021-09-10 | 2021-09-10 | Damping hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111059886.3A CN113847376B (en) | 2021-09-10 | 2021-09-10 | Damping hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113847376A true CN113847376A (en) | 2021-12-28 |
| CN113847376B CN113847376B (en) | 2023-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111059886.3A Active CN113847376B (en) | 2021-09-10 | 2021-09-10 | Damping hydraulic cylinder |
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| Country | Link |
|---|---|
| CN (1) | CN113847376B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160238045A1 (en) * | 2013-10-24 | 2016-08-18 | Byd Company Limited | Single-way damping plunger cylinder and forklift comprising the same |
| CN108253077A (en) * | 2017-12-13 | 2018-07-06 | 深圳市罗伯医疗机器人研究所 | A kind of binary channels variable damping force hydraulic cylinder |
| CN108518386A (en) * | 2018-05-09 | 2018-09-11 | 中山市智泰机电科技有限公司 | A kind of cushion cylinder |
| CN110195761A (en) * | 2019-04-17 | 2019-09-03 | 武汉船用机械有限责任公司 | Hydraulic anticollision device, collision-prevention device |
-
2021
- 2021-09-10 CN CN202111059886.3A patent/CN113847376B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160238045A1 (en) * | 2013-10-24 | 2016-08-18 | Byd Company Limited | Single-way damping plunger cylinder and forklift comprising the same |
| CN108253077A (en) * | 2017-12-13 | 2018-07-06 | 深圳市罗伯医疗机器人研究所 | A kind of binary channels variable damping force hydraulic cylinder |
| CN108518386A (en) * | 2018-05-09 | 2018-09-11 | 中山市智泰机电科技有限公司 | A kind of cushion cylinder |
| CN110195761A (en) * | 2019-04-17 | 2019-09-03 | 武汉船用机械有限责任公司 | Hydraulic anticollision device, collision-prevention device |
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| Publication number | Publication date |
|---|---|
| CN113847376B (en) | 2023-04-28 |
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