CN110950264A - Hydraulic cylinder device for jack - Google Patents
Hydraulic cylinder device for jack Download PDFInfo
- Publication number
- CN110950264A CN110950264A CN201911394471.4A CN201911394471A CN110950264A CN 110950264 A CN110950264 A CN 110950264A CN 201911394471 A CN201911394471 A CN 201911394471A CN 110950264 A CN110950264 A CN 110950264A
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- China
- Prior art keywords
- hydraulic cylinder
- sleeve
- balance valve
- channel
- piston rod
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/26—Adaptations or arrangements of pistons
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/003—Systems with load-holding valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a hydraulic cylinder device for a jack, and particularly relates to the technical field of jacks for supporting vehicles. The jack is used for supporting a vehicle, a first channel and a second channel are arranged in a piston rod of the hydraulic cylinder device, the first channel and the second channel both extend along the axial direction of the piston rod, one end of the first channel and one end of the second channel are both communicated with the outer end of the piston rod, the other end of the first channel is communicated with a rodless cavity of the hydraulic cylinder, and the other end of the second channel is communicated with a rod cavity of the hydraulic cylinder; one end of the first channel is connected with a first balance valve, and one end of the second channel is connected with a second balance valve.
Description
Technical Field
The invention relates to the technical field of jacks for supporting vehicles, in particular to a hydraulic cylinder device for a jack.
Background
Engineering vehicles, such as cranes and street lamp operation vehicles, need to be unfolded in the operation process to realize the functions. Therefore, in order to ensure the stability of the vehicle in the operation process, a plurality of jacks are needed to support the periphery of the vehicle, so that the vehicle is stabilized.
These jacks are heavily loaded, and therefore require hydraulic cylinders in conjunction with pistons to support the jacks. However, during the retraction process of the jack, the load is usually 30% -50% of the weight of the vehicle body, so that great impact is caused to the hydraulic cylinder, the piston rod shakes, and the service life of the whole hydraulic system is seriously lost.
Disclosure of Invention
The invention aims to solve the problems that the existing hydraulic cylinder device of the jack for supporting the vehicle shakes in the contraction process and the service life of the whole hydraulic system is seriously lost to a certain extent.
In order to solve the above problems, the present invention provides a hydraulic cylinder device for a jack, wherein the jack is used for supporting a vehicle, a piston rod of the hydraulic cylinder device is internally provided with a first channel and a second channel, the first channel and the second channel both extend along an axial direction of the piston rod, one end of each of the first channel and the second channel is communicated with an outer end of the piston rod, the other end of the first channel is communicated with a rodless cavity of the hydraulic cylinder, and the other end of the second channel is communicated with a rod cavity of the hydraulic cylinder;
one end of the first channel is connected with a first balance valve, and one end of the second channel is connected with a second balance valve.
Further, the first counter-balance valve interlocks with the second counter-balance valve.
Further, the first balance valve and the second balance valve are both one-way balance valves, the first balance valve is connected with a first one-way valve in parallel, the second balance valve is connected with a second one-way valve in parallel, one end of the first channel is simultaneously connected with the input end of the first balance valve and the output end of the first one-way valve, and one end of the second channel is simultaneously connected with the input end of the second balance valve and the output end of the second one-way valve;
the output end of the first balance valve and the input end of the first one-way valve are connected with a first connecting pipe at the same time, and the output end of the second balance valve and the input end of the second one-way valve are connected with a second connecting pipe at the same time.
Furthermore, the first connecting pipe and the second connecting pipe are respectively connected with a reversing valve of the pump station.
Further, the first connection pipe is connected with a third connection pipe, and the third connection pipe is connected with the second balance valve.
Further, the second connecting pipe is connected with a fourth connecting pipe, and the fourth connecting pipe is connected with the first balance valve.
Further, the piston rod comprises a first sleeve and a second sleeve, the first sleeve is sleeved in the second sleeve, one end of the first sleeve is fixed with a piston of the hydraulic cylinder device, the other end of the first sleeve is connected with the outer end of the piston rod, the piston is provided with a first through hole, and the rodless cavity is communicated with the interior of the first sleeve through the first through hole so as to form the first channel in the first sleeve;
one end of the second sleeve is fixed with the piston, the other end of the second sleeve is connected with the outer end of the piston rod, a plurality of second through holes are formed in the side wall of the other end of the second sleeve, and the second through holes enable a gap between the second sleeve and the second sleeve to be communicated with the rod cavity to form a second channel.
Furthermore, the outer end of the piston rod extends out of the hydraulic cylinder device, a third through hole is formed in the outer end of the piston rod, and the third through hole is communicated with the first sleeve.
Furthermore, the outer end of the piston rod extends out of the hydraulic cylinder device, a fourth through hole is formed in the outer end of the piston rod, and a gap between the first sleeve and the second sleeve is communicated with the fourth through hole.
Further, the first and second counter-balance valves are identical in structure, and are mounted at the outer end of the piston rod.
The invention combines the use characteristics of the hydraulic cylinder of the jack of the engineering truck, and needs to save the use space in the truck body of the engineering truck, and under the normal condition, the hydraulic cylinder of the vehicle-mounted jack is fixed on the truck body, and the piston rod of the vehicle-mounted jack is used as a ground foot to extend out of the hydraulic cylinder and support the truck. Therefore, in order to save the space of the vehicle body occupied by the balance valve, the hydraulic cylinder structure is improved, so that the connection of the rodless cavity and the rod cavity of the hydraulic cylinder device is communicated through a first channel and a second channel formed in the piston rod, then one end of the first channel is connected with the first balance valve, one end of the second channel is connected with the second balance valve, the first balance valve and the second balance valve are installed at the outer end of the piston rod, a connecting pipe is omitted, and the problem that the service life of a pipeline is shortened due to overlarge hydraulic oil caused by pipeline connection is fundamentally avoided.
Meanwhile, the rodless cavity and the rod cavity of the hydraulic cylinder device are communicated through the first channel and the second channel formed in the piston rod, the first balance valve and the second balance valve are installed at the outer end of the piston rod, and the first balance valve and the second balance valve can be prevented from occupying the space of a vehicle body. Thereby making full use of the excess space at the outer end of the piston rod.
Drawings
Fig. 1 is a schematic piping connection diagram of a hydraulic cylinder device for a jack according to an embodiment of the present invention;
fig. 2 is a schematic configuration view of a hydraulic cylinder device for a jack according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", and the like, which indicate orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Also, in the drawings, the Z-axis represents the axial direction of the hydraulic rod, and the positive direction of the Z-axis (i.e., the arrow direction of the Z-axis) represents the outer end of the hydraulic rod;
it should also be noted that the foregoing Z-axis is meant only to facilitate the description of the invention and to simplify the description, and is not intended to indicate or imply that the device or element so referred to must be constructed and operated in a particular orientation and therefore should not be considered as limiting the invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1 and 2, the present embodiment provides a hydraulic cylinder device for a jack, the jack being used to support a vehicle, a first passage 110 and a second passage 120 being provided in a piston rod 100 of the hydraulic cylinder device, the first passage 110 and the second passage 120 both extending in an axial direction of the piston rod 100, one end of each of the first passage 110 and the second passage 120 being communicated with an outer end of the piston rod 100, the other end of the first passage 110 being communicated with a rodless chamber 200 of the hydraulic cylinder, and the other end of the second passage 120 being communicated with a rod chamber 300 of the hydraulic cylinder;
a first balance valve 410 is connected to one end of the first passage 110, and a second balance valve 420 is connected to one end of the second passage 120.
The inventor of the present invention found that the main reason for the shaking of the piston rod 100 of the jack during the contraction process and the serious loss of the service life of the whole hydraulic system is that there is a gap between the movable valve core and the housing of the reversing valve used in the hydraulic system, and the gap cannot be eliminated, especially by improving the machining precision.
As a result, the entire hydraulic system bears a very large weight of the vehicle body during the contraction of the piston rod 100, and the hydraulic oil pressure of the entire system is very high, in which case the hydraulic oil leaks through the gap between the spool and the housing of the directional valve, thereby causing partial failure of the function of the directional valve, or even serious failure of the directional valve. Thereby causing the aforementioned problems to occur.
Based on the discovery, the inventor of the present invention adds a balance valve to stabilize the pressure of the entire hydraulic system, and in particular, uses the first balance valve 410 and the second balance valve 420 to balance the hydraulic oil pressures in the rodless chamber 200 and the rod chamber 300, respectively, so that the pressure of the hydraulic line of the entire hydraulic cylinder device is stabilized during the contraction of the piston rod 100, thereby avoiding the problem of oil leakage in the gap of the directional valve. The problem is effectively solved.
Further, the inventors of the present invention have further studied on the basis of this, and have found that although the balance valve 410 and the second balance valve 420 are used to perform a balancing function, the balance valve is generally bulky, and particularly, two balance valves are used, so that the balance valve and the hydraulic cylinder device are separated from each other and connected to each other through a pipe, thereby being mounted on the body of the working vehicle. In this case, since the distance between the balance valve and the hydraulic cylinder device is very long, and during the contraction of the piston rod 100, the pressure of the hydraulic oil in the pipeline between the balance valve and the hydraulic cylinder is still very large, so that the pipeline in this section is subjected to huge hydraulic oil pressure, which results in that the service life of the pipeline parts is shortened under the high pressure of the hydraulic oil, and the pipeline parts are scrapped too early, which causes great inconvenience in use and maintenance.
Therefore, the inventor of the present invention has made improvement and innovation again, and at the same time, in combination with the use characteristics of the hydraulic cylinder of the jack of the engineering truck, it is required to save the use space in the truck body of the engineering truck, and in general, the hydraulic cylinder of the truck-mounted jack is fixed on the truck body, and the piston rod 100 thereof is used as a ground foot to extend out of the hydraulic cylinder and support the truck. Therefore, in order to save the space of the vehicle body occupied by the balance valve, the hydraulic cylinder structure is improved, so that the connection of the rodless chamber 200 and the rod chamber 300 of the hydraulic cylinder device is communicated through the first passage 110 and the second passage 120 formed in the piston rod 100, then one end of the first passage 110 is connected with the first balance valve 410, and one end of the second passage 120 is connected with the second balance valve 420, so that the first balance valve 410 and the second balance valve 420 are installed at the outer end of the piston rod 100, the connecting pipe is omitted, and the reduction of the service life of the pipeline due to the fact that the hydraulic oil is too large due to the use of pipeline connection is fundamentally avoided.
Meanwhile, by connecting the rodless chamber 200 and the rod chamber 300 of the hydraulic cylinder device to communicate through the first passage 110 and the second passage 120 formed in the piston rod 100, and installing the first and second balance valves 410 and 420 at the outer end of the piston rod 100, it is possible to prevent the first and second balance valves 410 and 420 from occupying the space of the vehicle body. Thereby making full use of more space at the outer end of the piston rod 100.
It should be noted that the outer end of the piston rod 100 is usually provided with a foot so that the outer end of the piston rod 100 supports the ground.
Referring to fig. 1 and 2, preferably, the first counter-balance valve 410 is interlocked with the second counter-balance valve 420.
The first balance valve 410 is interlocked with the second balance valve 420, so that the interlocking of the rod cavity 300 passage and the rodless cavity 200 passage is ensured, and the use safety is ensured.
Referring to fig. 1 and 2, preferably, the first balance valve 410 and the second balance valve 420 are each a one-way balance valve, the first balance valve 410 is connected in parallel with a first one-way valve 430, the second balance valve 420 is connected in parallel with a second one-way valve 440, one end of the first passage 110 is connected to both an input end of the first balance valve 410 and an output end of the first one-way valve 430, and one end of the second passage 120 is connected to both an input end of the second balance valve 420 and an output end of the second one-way valve 440;
the output terminal of the first balance valve 410 and the input terminal of the first check valve 430 are simultaneously connected to the first connection pipe 510, and the output terminal of the second balance valve 420 and the input terminal of the second check valve 440 are simultaneously connected to the second connection pipe 520.
The first balance valve 410 and the second balance valve 420 are both one-way balance valves, and meanwhile, the first balance valve 410 is matched with the first one-way valve 430, and the second balance valve 420 is matched with the second one-way valve 440, so that the pressure of hydraulic oil flowing through the balance valves is stabilized.
Referring to fig. 1 and 2, preferably, the first connection pipe 510 and the second connection pipe 520 are respectively connected to a reversing valve of the pump station.
It should be noted that the pump station may be a hydraulic station, and the hydraulic station includes a common pipeline form of a hydraulic pipeline such as a driving pump, an oil tank, and an unloading valve.
Referring to fig. 1 and 2, preferably, the first connection pipe 510 is connected with the third connection pipe 530, and the third connection pipe 530 is connected with the second balance valve 420.
Referring to fig. 1 and 2, preferably, the second connection pipe 520 is connected to a fourth connection pipe 540, and the fourth connection pipe 540 is connected to the first balance valve 410.
In this way, the first balance valve 410 is interlocked with the second balance valve 420 by the third connection pipe 530 and the fourth connection pipe 540.
When in use, the pump station leads hydraulic oil to the first connecting pipe 510 through the reversing valve, the hydraulic oil enters the rodless cavity 200 through the first check valve 430 and the first channel 110, the rodless cavity 200 pushes the piston 600 to move towards the rod cavity 300, the rod cavity 300 enables the hydraulic oil in the rod cavity to flow towards the second balance valve 420, in the process, the second balance valve 420 is controlled by the third connecting pipe 530, the hydraulic oil in the first connecting pipe 510 enters the third connecting pipe 530 and enables the second balance valve 420 to form a passage, and therefore the hydraulic oil in the rod cavity 300 reaches the reversing valve through the second balance valve 420 and the second connecting pipe 520 and returns to the oil tank. Thereby enabling the piston rod 100 to be extended.
On the contrary, when the piston rod 100 retracts, the pump station feeds hydraulic oil to the second connecting pipe 520 through the reversing valve, the hydraulic oil enters the rod chamber 300 through the second check valve 440 and the second channel 120, the rod chamber 300 pushes the piston 600 to move towards the rodless chamber 200, the rodless chamber 200 enables the hydraulic oil in the rod chamber to flow towards the first balance valve 410, in the process, the first balance valve 410 is controlled by the fourth connecting pipe 540, the hydraulic oil of the second connecting pipe 520 enters the fourth connecting pipe 540 and enables the first balance valve 410 to form a passage, and therefore the hydraulic oil in the rodless chamber 200 reaches the reversing valve through the first balance valve 410 and the first connecting pipe 510 and returns to the oil tank, and therefore the retraction of the piston rod 100 is achieved.
Referring to fig. 1 and 2, preferably, the piston rod 100 includes a first sleeve 610 and a second sleeve 620, the first sleeve 610 is sleeved in the second sleeve 620, one end of the first sleeve 610 is fixed to the piston 600 of the hydraulic cylinder device, the other end of the first sleeve 610 is connected to the outer end of the piston rod 100, the piston 600 is provided with a first through hole 601, and the first through hole 601 communicates the rodless chamber 200 with the inside of the first sleeve 610 to form a first passage 110 in the first sleeve 610;
one end of the second sleeve 620 is fixed to the piston 600, the other end of the second sleeve 620 is connected to the outer end of the piston rod 100, a plurality of second through holes 621 are formed in the side wall of the other end of the second sleeve 620, and the second through holes 621 enable the gap between the second sleeve 620 and the second sleeve 620 to be communicated with the rod cavity 300 to form the second channel 120.
By the structural form of the first sleeve 610 and the second sleeve 620, the space of the piston rod 100 is fully utilized, and the machining amount of the first channel 110 and the second channel 120 is reduced. Thereby making the first and second passages 110 and 120 easy to machine.
Referring to fig. 1 and 2, preferably, the outer end of the piston rod 100 extends out of the hydraulic cylinder device, the outer end of the piston rod 100 is provided with a third through hole 101, and the third through hole 101 is communicated with the inside of the first sleeve 610.
Referring to fig. 1 and 2, preferably, the outer end of the piston rod 100 extends out of the hydraulic cylinder device, the outer end of the piston rod 100 is provided with a fourth through hole 102, and a gap between the first sleeve 610 and the second sleeve 620 is communicated with the fourth through hole 102.
Referring to fig. 1 and 2, preferably, the first and second balance valves 410 and 420 are identical in structure, and the first and second balance valves 410 and 420 are installed at the outer end of the piston rod 100.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A hydraulic cylinder device for a jack is characterized in that the jack is used for supporting a vehicle, a piston rod of the hydraulic cylinder device is internally provided with a first channel and a second channel, the first channel and the second channel both extend along the axial direction of the piston rod, one ends of the first channel and the second channel are both communicated with the outer end of the piston rod, the other end of the first channel is communicated with a rodless cavity of the hydraulic cylinder, and the other end of the second channel is communicated with a rod cavity of the hydraulic cylinder;
one end of the first channel is connected with a first balance valve, and one end of the second channel is connected with a second balance valve.
2. Hydraulic cylinder arrangement for a jack according to claim 1, characterised in that the first counter-balance valve is interlocked with the second counter-balance valve.
3. The hydraulic cylinder device for a jack according to claim 1, wherein the first balance valve and the second balance valve are each a one-way balance valve, the first balance valve is connected in parallel with a first one-way valve, the second balance valve is connected in parallel with a second one-way valve, one end of the first passage is connected to both the input end of the first balance valve and the output end of the first one-way valve, and one end of the second passage is connected to both the input end of the second balance valve and the output end of the second one-way valve;
the output end of the first balance valve and the input end of the first one-way valve are connected with a first connecting pipe at the same time, and the output end of the second balance valve and the input end of the second one-way valve are connected with a second connecting pipe at the same time.
4. The hydraulic cylinder apparatus for a jack according to claim 3, wherein the first connection pipe and the second connection pipe are respectively connected to a reversing valve of a pump station.
5. The hydraulic cylinder device for a jack according to claim 4, wherein the first connection pipe is connected to a third connection pipe, and the third connection pipe is connected to the second counter balance valve.
6. The hydraulic cylinder device for a jack according to claim 5, wherein the second connection pipe is connected to a fourth connection pipe, and the fourth connection pipe is connected to the first balance valve.
7. The hydraulic cylinder device for a jack as claimed in claim 6, wherein the piston rod includes a first sleeve and a second sleeve, the first sleeve is sleeved in the second sleeve, one end of the first sleeve is fixed to the piston of the hydraulic cylinder device, the other end of the first sleeve is connected to the outer end of the piston rod, the piston is provided with a first through hole, and the first through hole connects the rodless chamber and the first sleeve to form the first passage in the first sleeve;
one end of the second sleeve is fixed with the piston, the other end of the second sleeve is connected with the outer end of the piston rod, a plurality of second through holes are formed in the side wall of the other end of the second sleeve, and the second through holes enable a gap between the second sleeve and the second sleeve to be communicated with the rod cavity to form a second channel.
8. The hydraulic cylinder device for a jack according to claim 7, wherein an outer end of the piston rod extends out of the hydraulic cylinder device, and a third through hole is formed in the outer end of the piston rod and communicated with the first sleeve.
9. The hydraulic cylinder device for a jack according to claim 8, wherein an outer end of the piston rod extends out of the hydraulic cylinder device, a fourth through hole is formed in the outer end of the piston rod, and a gap between the first sleeve and the second sleeve is communicated with the fourth through hole.
10. A hydraulic cylinder arrangement for a jack as claimed in any one of claims 1 to 9 wherein the first and second counter-balance valves are of identical construction, the first and second counter-balance valves being mounted at the outer end of the piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911394471.4A CN110950264A (en) | 2019-12-30 | 2019-12-30 | Hydraulic cylinder device for jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911394471.4A CN110950264A (en) | 2019-12-30 | 2019-12-30 | Hydraulic cylinder device for jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110950264A true CN110950264A (en) | 2020-04-03 |
Family
ID=69984976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911394471.4A Withdrawn CN110950264A (en) | 2019-12-30 | 2019-12-30 | Hydraulic cylinder device for jack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110950264A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048123A (en) * | 2021-03-24 | 2021-06-29 | 北京汽车集团越野车有限公司 | Power cylinder assembly and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5406880A (en) * | 1992-06-09 | 1995-04-18 | Oildrive Pty. Ltd. | Heavy equipment jack |
| CN200982160Y (en) * | 2006-12-20 | 2007-11-28 | 四川宏华石油设备有限公司 | Hydraulic lifting synchronous controlling device for drilling rig headframe and base |
| CN204140521U (en) * | 2014-09-26 | 2015-02-04 | 长沙中联消防机械有限公司 | Hydraulic control circuit, side ladder device and fire-fighting truck |
| CN106837926A (en) * | 2016-12-28 | 2017-06-13 | 长沙中联消防机械有限公司 | Hydraulic cylinder, hydraulic circuit and fire fighting truck |
| CN108457931A (en) * | 2018-05-03 | 2018-08-28 | 陕西昆仑机械装备制造有限责任公司 | A kind of piston rod oil inlet oil extraction oil cylinder |
-
2019
- 2019-12-30 CN CN201911394471.4A patent/CN110950264A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5406880A (en) * | 1992-06-09 | 1995-04-18 | Oildrive Pty. Ltd. | Heavy equipment jack |
| CN200982160Y (en) * | 2006-12-20 | 2007-11-28 | 四川宏华石油设备有限公司 | Hydraulic lifting synchronous controlling device for drilling rig headframe and base |
| CN204140521U (en) * | 2014-09-26 | 2015-02-04 | 长沙中联消防机械有限公司 | Hydraulic control circuit, side ladder device and fire-fighting truck |
| CN106837926A (en) * | 2016-12-28 | 2017-06-13 | 长沙中联消防机械有限公司 | Hydraulic cylinder, hydraulic circuit and fire fighting truck |
| CN108457931A (en) * | 2018-05-03 | 2018-08-28 | 陕西昆仑机械装备制造有限责任公司 | A kind of piston rod oil inlet oil extraction oil cylinder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048123A (en) * | 2021-03-24 | 2021-06-29 | 北京汽车集团越野车有限公司 | Power cylinder assembly and vehicle |
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Application publication date: 20200403 |