CN112503055A - Multi-stage hydraulic cylinder - Google Patents
Multi-stage hydraulic cylinder Download PDFInfo
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- CN112503055A CN112503055A CN201910870343.6A CN201910870343A CN112503055A CN 112503055 A CN112503055 A CN 112503055A CN 201910870343 A CN201910870343 A CN 201910870343A CN 112503055 A CN112503055 A CN 112503055A
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1404—Characterised by the construction of the motor unit of the straight-cylinder type in clusters, e.g. multiple cylinders in one block
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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
- F15B15/08—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
- F15B15/1457—Piston rods
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention relates to the field of hydraulic cylinders, and discloses a multistage hydraulic cylinder which comprises a first cylinder device (10), a second cylinder device (20) and a piston device (30), wherein the second cylinder device divides an inner cavity of the first cylinder device into a large rodless cavity and a large rod cavity, the piston device divides the inner cavity of the second cylinder device into a small rodless cavity and a small rod cavity, the piston device comprises a piston and a hollow piston rod which are connected with each other, a first oil pipe, a second oil pipe and a third oil pipe which are respectively communicated with a first oil port, a second oil port, a third oil port and a fourth oil port of a rod head of the piston rod are arranged in the hollow cavity of the piston rod, the first oil pipe is arranged to be communicated with the large rodless cavity, the second oil pipe is arranged to be communicated with the large rod cavity, the third oil pipe is arranged to be communicated with the small rodless cavity, and the hollow cavity is arranged to be communicated with the small rod cavity. The invention has relatively independent oil passages for respectively controlling the extension and retraction of the second cylinder device and the piston device, and can adjust the working parameters of respective operations.
Description
Technical Field
The invention relates to the field of hydraulic cylinders, in particular to a multi-stage hydraulic cylinder.
Background
In the existing multi-stage hydraulic cylinder, oil paths of a first-stage oil cylinder and a second-stage oil cylinder are excessively related to each other, so that the oil cylinders at all stages are required to be sequentially stretched and the stretching speed and other working parameters are required to be kept consistent.
Therefore, in the prior art, the problem that the working parameters of all levels of oil cylinders cannot be set independently according to needs exists.
Disclosure of Invention
The invention aims to overcome the problem of inconvenient operation in the prior art, and provides a multi-stage hydraulic cylinder which is convenient to operate according to needs.
In order to achieve the above object, the present invention provides a multistage hydraulic cylinder, wherein the multistage hydraulic cylinder comprises a first cylinder device, a second cylinder device and a piston device, which are sequentially sleeved from outside to inside, the second cylinder device divides an inner cavity of the first cylinder device into a large rodless cavity and a large rod cavity, the piston device divides an inner cavity of the second cylinder device into a small rodless cavity and a small rod cavity, the piston device comprises a piston and a hollow piston rod, which are connected with each other, a first oil pipe, a second oil pipe and a third oil pipe are arranged in the hollow cavity of the piston rod, a first oil port, a second oil port, a third oil port and a fourth oil port, which are respectively communicated with the first oil pipe, the second oil pipe, the third oil pipe and the hollow cavity, the first oil pipe is arranged to be capable of being communicated with the large rodless cavity, the second oil pipe is arranged to be communicated with the large rod cavity, the third oil pipe is arranged to be communicated with the small rodless cavity, and the hollow cavity is arranged to be communicated with the small rod cavity.
Optionally, a spacer bush is sleeved on the piston rod, and a first oil passage and a second oil passage corresponding to each other are arranged on the piston rod and the spacer bush to communicate the hollow cavity with the small rod cavity.
Optionally, the piston is provided with a third oil passage for communicating the third oil pipe with the small rodless cavity.
Optionally, the piston and the second cylinder device are provided with a corresponding fourth oil passage and a corresponding fifth oil passage to communicate the large rod cavity and the second oil pipe; and the piston and the second cylinder device are provided with a corresponding sixth oil duct and a corresponding seventh oil duct so as to communicate the large rodless cavity with the first oil pipe.
Optionally, the piston includes the piston body and connect in the terminal piston rod tail of piston rod, the piston rod tail cover is established in the piston body, wherein: the fourth oil passage includes a first portion and a second portion that are provided in the piston rod tail and the piston body, respectively, and that communicate with each other; the sixth oil passage includes a third portion and a fourth portion that are provided in the piston rod tail and the piston body, respectively, and that communicate with each other.
Optionally, the second portion and the fourth portion have ports located on the outer circumferential surface of the piston body and arranged along the moving direction of the piston, and a first sealing member for isolating the ports of the second portion and the fourth portion is disposed on the piston body.
Optionally, the second cylinder barrel device includes a cylinder body and a cylinder tail disposed at the bottom of the cylinder body, and the fifth oil passage and the seventh oil passage are disposed on the cylinder tail.
Optionally, a second seal isolating the large rodless chamber and the large rod chamber is provided on the cylinder tail.
Optionally, the first cylinder device includes a cylinder and a cylinder cover disposed at the bottom of the cylinder.
Optionally, a first guide sleeve and a second guide sleeve are respectively arranged on the piston rod and a part of the second cylinder device close to the rod head.
Through the technical scheme, the first oil port, the second oil port, the third oil port and the fourth oil port can form relatively independent oil paths for respectively controlling the extension and retraction of the second cylinder barrel device and the piston device through the corresponding large rodless cavity, the large rod cavity, the small rodless cavity and the small rod cavity, so that the second cylinder barrel device and the piston device can adjust the respective operating parameters according to the requirements.
Drawings
Fig. 1 is a schematic structural view illustrating an embodiment of a multistage hydraulic cylinder according to the present invention.
Description of the reference numerals
10-a first cylinder device, 11-a large rodless cavity, 12-a large rod cavity, 13-a cylinder, 14-a cylinder head, 20-a second cylinder device, 21-a small rodless cavity, 22-a small rod cavity, 23-a cylinder, 24-a cylinder tail, 25-a second guide sleeve, 241-a fifth oil duct, 242-a seventh oil duct, 30-a piston device, 31-a piston, 311-a piston body, 311 a-a first part, 311 b-a third part, 312-a piston rod tail, 312 a-a second part, 312 b-a fourth part, 313-a third oil duct, 32-a piston rod, 321-a first oil port, 322-a second oil port, 323-a third oil port, 324-a fourth oil port, 325-a first oil duct, 326-a first guide sleeve, 33-spacer, 331-second gallery, 40-first oil pipe, 50-second oil pipe, 60-third oil pipe, 70-first seal, 80-second seal, 90-third seal.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" refer to the inner and outer relative to the profile of the components themselves. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The invention provides a multistage hydraulic cylinder, wherein the multistage hydraulic cylinder comprises a first cylinder device 10, a second cylinder device 20 and a piston device 30 which are sleeved from outside to inside in sequence, the second cylinder device 20 divides an inner cavity of the first cylinder device 10 into a large rodless cavity 11 and a large rod cavity 12, the piston device 30 divides the inner cavity of the second cylinder device 20 into a small rodless cavity 21 and a small rod cavity 22, the piston device 30 comprises a piston 31 and a hollow piston rod 32 which are connected with each other, a first oil pipe 40, a second oil pipe 50 and a third oil pipe 60 are arranged in the hollow cavity of the piston rod 32, the rod head of the piston rod 32 is provided with a first oil port 321, a second oil port 322, a third oil port 323 and a fourth oil port 324 which are respectively communicated with the first oil pipe 40, the second oil pipe 50, the third oil pipe 60 and the hollow cavity, the first oil pipe 40 is arranged to be communicated with the large rodless cavity 11, the second oil pipe 50 is provided to be able to communicate with the large rod chamber 12, the third oil pipe 60 is provided to communicate with the small rodless chamber 21, and the hollow chamber is provided to communicate with the small rod chamber 22.
The multistage hydraulic cylinder can form relatively independent oil paths for respectively controlling the extension and retraction of the second cylinder device 20 and the piston device 30 through the first oil port 321, the second oil port 322, the third oil port 323 and the fourth oil port 324 and the corresponding large rodless cavity 11, the large rod cavity 12, the small rodless cavity 21 and the small rod cavity 22, so that the second cylinder device 20 and the piston device 30 can adjust the operating parameters of respective operations as required. Specifically, the second cylinder device 20 and the piston device 30 may be operated by respective oil passages, and thus may be operated at respective desired speeds.
In order to realize the corresponding communication between the first oil port 321, the second oil port 322, the third oil port 323, and the fourth oil port 324 and the corresponding large rodless cavity 11, the large rod cavity 12, the small rodless cavity 21, and the small rod cavity 22, the second cylinder device 20 and the piston device 30 may be configured in a corresponding structure to establish a passage connecting the corresponding oil ports and the corresponding chambers.
Optionally, the piston rod 32 is sleeved with a spacer 33, and the piston rod 32 and the spacer 33 may be provided with a corresponding first oil passage 325 and a corresponding second oil passage 331, so as to communicate the hollow cavity with the small rod cavity 22. In order to simplify the structure, the first oil passage 325 is a through hole that radially penetrates the wall of the piston rod 32, and the second oil passage 331 is correspondingly provided as a through hole that radially penetrates the spacer 33. Hydraulic oil can flow between the first oil passage 325 and the second oil passage 331 via a clearance between the spacer 33 and the piston rod 32.
Of course, the hollow cavity and the small rod cavity 22 may be communicated in other manners, for example, by providing corresponding oil passages on the piston body 311 and other components described below to achieve communication between the hollow cavity and the small rod cavity 22.
In addition, a small rodless chamber 21 is located between the bottom of the piston 31 and the second cylinder device 20. As shown in fig. 1, the piston 31 may be provided with a third oil passage 313 communicating the third oil pipe 60 and the small rodless chamber 21. Among them, the third oil passage 313 may penetrate the piston rod 31 in parallel to the moving direction of the piston rod 31 to simplify the structure and reduce interference with other oil passage structures.
Since the large rodless chamber 11 and the large rod chamber 12 are disposed between the first cylinder device 10 and the second cylinder device 20 and are communicated with the corresponding oil pipes in the piston rod 32, the piston 31 and the second cylinder device 20 need to be provided with corresponding oil passages. Specifically, the piston 31 and the second cylinder device 20 are provided with corresponding fourth and fifth oil passages 241 to communicate the large rod chamber 12 and the second oil pipe 50; the piston 31 and the second cylinder device 20 are provided with corresponding sixth and seventh oil passages 242 to communicate the large rodless chamber 11 and the first oil pipe 40.
The oil passages may be provided according to the specific structures of the piston 31 and the second cylinder device 20. For example, in the embodiment shown in fig. 1, the piston 31 includes a piston body 311 and a piston rod tail 312 connected to the end of the piston rod 32, the piston rod tail 312 is sleeved in the piston body 31, wherein: the fourth oil passage includes a first portion 311a and a second portion 312a that are provided in the piston rod tail 311 and the piston body 312, respectively, and communicate with each other; the sixth oil passage includes a third portion 311b and a fourth portion 312b that are provided in the piston rod tail 311 and the piston body 312, respectively, and communicate with each other.
Specifically, the first portion 311a may include a first straight portion parallel to the moving direction of the piston 31 and a second straight portion perpendicular to the first straight portion, and the second portion 312a may be a straight oil passage in correspondence with the extending direction of the second straight portion. Similarly, the third portion 311b may include a third straight portion parallel to the moving direction of the piston 31 and a fourth straight portion perpendicular to the third straight portion, and the fourth portion 312b may be a straight oil passage in accordance with the extending direction of the fourth straight portion. Wherein the second portion 312a is disposed closer to the piston rod 32 than the fourth portion 312b, i.e., the portion of the second cylinder device 20 defining the large rod chamber 12.
The first and third portions 311a and 311b have ports on the outer circumferential surface of the piston body 311 aligned in the moving direction of the piston 31, and in order to ensure independence between different oil passages, the piston body 311 may be provided with a first seal 70 for isolating the ports of the first and third portions 311a and 311b, alternatively.
In addition, as shown in fig. 1, the second cylinder device 20 may include a cylinder block 23 and a cylinder tail 24 disposed at the bottom of the cylinder block 23, and the fifth oil passage 241 and the seventh oil passage 242 are disposed on the cylinder tail 24. Wherein, the cylinder 23 is substantially correspondingly sleeved outside the piston rod 32, and the cylinder tail 24 is correspondingly sleeved outside the piston 31. For convenience of arrangement and simplification of structure, the fifth oil passage 241 is a straight oil passage that coincides with the extending direction of the second portion 312a, and the seventh oil passage 242 includes a fifth straight portion that coincides with the extending direction of the fourth portion 321b and a sixth straight portion that is connected to the fifth straight portion and coincides with the moving direction of the second cylinder device 20.
To ensure the independence of the different oil passages, a second seal 80 is provided on the cylinder tail 24 to isolate the large rodless chamber 11 from the large rod chamber 12. In addition, a third seal 90 may be provided between the piston device 30 and the second cylinder device 20.
The first cylinder device 10 is used to cooperate with the second cylinder device 20 to form a large rodless chamber 11 and a large rod chamber 12, and the first cylinder device 10 may adopt a conventional cylinder structure, for example, the first cylinder device 10 includes a cylinder 13 and a cylinder head 14 disposed at the bottom of the cylinder 13.
In addition, in order to ensure the sealing performance of the entire apparatus, the piston rod 32 and the portion of the second cylinder device 20 near the rod head are provided with a first guide sleeve 326 and a second guide sleeve 25, respectively.
The multi-stage hydraulic cylinder of the present invention may be a two-stage hydraulic cylinder as shown in fig. 1, or may be a multi-stage hydraulic cylinder, and in the case of the multi-stage hydraulic cylinder, the structure and oil path arrangement between the other stages of hydraulic cylinders may be in a conventional manner as long as the two-stage telescopic mechanism formed by the first cylinder device 10, the second cylinder device 20, and the piston device 30 of the present invention is provided therein.
The operation of the multi-stage hydraulic cylinder of the present invention will be described with reference to fig. 1.
In the present invention, in the two-stage telescopic mechanism composed of the second cylinder device 20 and the piston device 30,
the second cylinder device 20 acts as a primary cylinder and the piston device 30 acts as a secondary cylinder, the multi-stage hydraulic cylinder of the present invention being shown in a fully retracted state in fig. 1.
From the state shown in fig. 1, it is possible to perform the primary cylinder extension first and then perform the secondary cylinder extension. Specifically, the method comprises the following steps:
when the first-stage cylinder extends, hydraulic oil enters from the first oil port 321, enters the large rodless cavity 11 through the first oil pipe 40, the third part 311b, the fourth part 312b and the seventh oil passage 242, and hydraulic oil in the large rod cavity 12 is discharged from the second oil port 322 through the fifth oil passage 241, the second part 312a, the first part 311a and the second oil pipe 50, so that the second cylinder-barrel device 20 can extend.
When the secondary cylinder extends, hydraulic oil enters from the third oil port 323, enters the small rodless cavity 21 through the third oil pipe 60 and the third oil passage 313, and hydraulic oil in the small rodless cavity 22 is discharged from the fourth oil port 324 through the second oil passage 331, the first oil passage 325 and the hollow cavity of the piston rod 31, so that the piston device 30 can extend.
In the state where the second cylinder-barrel assembly 20 and the piston assembly 30 are both extended, the secondary cylinder (i.e., the piston assembly 30) may be retracted first, and then the primary cylinder (i.e., the second cylinder-barrel assembly 20) may be retracted, specifically:
when the secondary cylinder retracts, hydraulic oil enters from the fourth oil port 324, enters the small rod chamber 22 through the hollow cavity of the piston rod 31, the first oil passage 325 and the second oil passage 331, and hydraulic oil in the small rodless chamber 21 is discharged from the third oil port 323 through the third oil passage 313 and the third oil pipe 60, so that the piston device 30 can retract.
When the first-stage cylinder retracts, hydraulic oil enters from the second oil port 322, enters the large rod chamber 12 through the second oil pipe 50, the first part 311a, the second part 312a and the fifth oil passage 241, and hydraulic oil in the large rodless chamber 11 is discharged from the first oil port 321 through the seventh oil passage 242, the fourth part 312b, the third part 311b and the first oil pipe 40, so that the second cylinder device 20 can retract.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention. The invention includes the combination of the individual features in any suitable manner. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. The multi-stage hydraulic cylinder is characterized by comprising a first cylinder device (10), a second cylinder device (20) and a piston device (30) which are sequentially sleeved from outside to inside, wherein the inner cavity of the first cylinder device (10) is divided into a large rodless cavity (11) and a large rod cavity (12) by the second cylinder device (20), the inner cavity of the second cylinder device (20) is divided into a small rodless cavity (21) and a small rod cavity (22) by the piston device (30), the piston device (30) comprises a piston (31) and a hollow piston rod (32) which are connected with each other, a first oil pipe (40), a second oil pipe (50) and a third oil pipe (60) are arranged in the hollow cavity of the piston rod (32), and the head of the piston rod (32) is respectively provided with the first oil pipe (40), the second oil pipe (50), Third oil pipe (60) with well first oil port (321), second oil port (322), third oil port (323) and fourth oil port (324) of cavity intercommunication, first oil pipe (40) set up to can with big rodless chamber (11) intercommunication, second oil pipe (50) set up to can with there is pole chamber (12) intercommunication greatly, third oil pipe (60) set up to with little rodless chamber (21) intercommunication, well cavity set up to with little pole chamber (22) intercommunication has.
2. The multistage hydraulic cylinder according to claim 1, wherein a spacer (33) is sleeved on the piston rod (32), and a first oil passage (325) and a second oil passage (331) are arranged on the piston rod (32) and the spacer (33) correspondingly to communicate the hollow cavity with the small rod cavity (22).
3. Multistage hydraulic cylinder according to claim 1, characterized in that the piston (31) is provided with a third oil channel (313) communicating the third oil pipe (60) and the small rodless chamber (21).
4. The multi-stage hydraulic cylinder of claim 3, wherein:
the piston (31) and the second cylinder device (20) are provided with a corresponding fourth oil channel and a corresponding fifth oil channel (241) so as to communicate the large rod cavity (12) and the second oil pipe (50);
the piston (31) and the second cylinder device (20) are provided with corresponding sixth and seventh oil passages (242) to communicate the large rodless chamber (11) and the first oil pipe (40).
5. The multi-stage hydraulic cylinder according to claim 4, wherein the piston (31) comprises a piston body (311) and a piston rod tail (312) connected to the end of the piston rod (32), the piston rod tail (312) being fitted inside the piston body (31), wherein:
the fourth oil passage includes a first portion (311a) and a second portion (312a) that are provided in the piston rod tail (311) and the piston body (312), respectively, and that communicate with each other;
the sixth oil passage includes a third portion (311b) and a fourth portion (312b) that are provided in the piston rod tail (311) and the piston body (312), respectively, and communicate with each other.
6. The multi-stage hydraulic cylinder according to claim 4, wherein the second portion (312a) and the fourth portion (312b) have ports on an outer peripheral surface of the piston body (312) aligned in a moving direction of the piston (31), and the piston body (312) is provided with a first seal (70) for isolating the ports of the second portion (312a) and the fourth portion (312 b).
7. The multi-stage hydraulic cylinder according to claim 4, wherein the second cylinder device (20) includes a cylinder block (23) and a cylinder tail (24) provided at a bottom of the cylinder block (23), and the fifth oil passage (241) and the seventh oil passage (242) are provided on the cylinder tail (24).
8. Multistage hydraulic cylinder according to claim 7, characterized in that a second seal (80) is provided on the cylinder tail (24) separating the large rodless chamber (11) and the large rodless chamber (12).
9. Multistage hydraulic cylinder according to any one of claims 1 to 8, characterized in that the first cylinder device (10) comprises a cylinder barrel (13) and a cylinder head (14) arranged at the bottom of the cylinder barrel (13).
10. Multistage hydraulic cylinder according to one of claims 1 to 8, wherein the piston rod (32) and the part of the second cylinder device (20) close to the rod head are provided with a first guide sleeve (326) and a second guide sleeve (25), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870343.6A CN112503055A (en) | 2019-09-16 | 2019-09-16 | Multi-stage hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870343.6A CN112503055A (en) | 2019-09-16 | 2019-09-16 | Multi-stage hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112503055A true CN112503055A (en) | 2021-03-16 |
Family
ID=74924003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910870343.6A Withdrawn CN112503055A (en) | 2019-09-16 | 2019-09-16 | Multi-stage hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112503055A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2058528A2 (en) * | 2007-11-07 | 2009-05-13 | Kobelco Cranes Co., Ltd. | Two-step telescopic cylinder |
| CN101806315A (en) * | 2010-04-07 | 2010-08-18 | 长沙中联重工科技发展股份有限公司 | Compound oil cylinder and refuse compactor thereof |
| CN102400975A (en) * | 2011-11-24 | 2012-04-04 | 湖南特力液压有限公司 | Secondary stretching and retracting hydraulic cylinder and hydraulic equipment |
| CN206309693U (en) * | 2016-12-23 | 2017-07-07 | 湖北佳恒科技有限公司 | A kind of multilevel sleeve type double acting hydraulic cylinder |
| CN109231030A (en) * | 2018-11-27 | 2019-01-18 | 千人计划常州新能源汽车研究院有限公司 | A kind of telescopic arm of engineering truck |
-
2019
- 2019-09-16 CN CN201910870343.6A patent/CN112503055A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2058528A2 (en) * | 2007-11-07 | 2009-05-13 | Kobelco Cranes Co., Ltd. | Two-step telescopic cylinder |
| CN101806315A (en) * | 2010-04-07 | 2010-08-18 | 长沙中联重工科技发展股份有限公司 | Compound oil cylinder and refuse compactor thereof |
| CN102400975A (en) * | 2011-11-24 | 2012-04-04 | 湖南特力液压有限公司 | Secondary stretching and retracting hydraulic cylinder and hydraulic equipment |
| CN206309693U (en) * | 2016-12-23 | 2017-07-07 | 湖北佳恒科技有限公司 | A kind of multilevel sleeve type double acting hydraulic cylinder |
| CN109231030A (en) * | 2018-11-27 | 2019-01-18 | 千人计划常州新能源汽车研究院有限公司 | A kind of telescopic arm of engineering truck |
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Application publication date: 20210316 |