CN113513280A - Torque self-control hydraulic oil pipe tongs - Google Patents
Torque self-control hydraulic oil pipe tongs Download PDFInfo
- Publication number
- CN113513280A CN113513280A CN202111052661.5A CN202111052661A CN113513280A CN 113513280 A CN113513280 A CN 113513280A CN 202111052661 A CN202111052661 A CN 202111052661A CN 113513280 A CN113513280 A CN 113513280A
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- oil
- channel
- torque
- motor
- electromagnet
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- 239000010720 hydraulic oil Substances 0.000 title claims abstract description 21
- 239000003921 oil Substances 0.000 claims abstract description 129
- 230000000903 blocking effect Effects 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 230000008093 supporting effect Effects 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 230000004907 flux Effects 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/161—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe
- E21B19/164—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe motor actuated
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/165—Control or monitoring arrangements therefor
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a torque self-control hydraulic tubing tong, which belongs to the technical field of oilfield pipeline instruments and comprises a hydraulic oil tank, an oil pump, a torque control box, a motor and a pipe tong body, wherein the oil pump is used for conveying oil liquid in the hydraulic oil tank to the motor from the torque control box, the motor is used for driving the pipe tong body to operate, and a channel through which the oil liquid can flow is formed in the torque control box. In the embodiment of the invention, the current transmitted to the electromagnet by the power supply part is gradually increased by the movement of the current adjusting part in the oil storage branch channel, so that the magnetic force generated by the electromagnet is gradually increased to attract the blocking block to continuously move towards the inside of the sliding cavity, the flux of oil liquid flowing through the channel is gradually increased, the output torque of the motor is gradually increased, the thread can be subjected to the gradually increased output torque in the screwing-in and unscrewing processes, and the thread sliding and even damage caused by overlarge initial torque are prevented.
Description
Technical Field
The invention belongs to the technical field of oilfield pipeline instruments, and particularly relates to a torque self-control hydraulic tubing tong.
Background
The hydraulic tubing tongs are a mechanical screw thread loading and unloading tool operated by the power of a workover rig, can greatly reduce the labor intensity of workover workers and improve the loading and unloading efficiency of screw threads.
In the prior art, when the hydraulic oil pipe tongs work, hydraulic oil is conveyed to a hydraulic motor by an oil pump, the hydraulic motor is driven to operate by utilizing the pressure of the hydraulic oil, and then torque is output to a hydraulic oil pipe tong body to drive the hydraulic oil pipe tongs to operate, so that the screwing-on and unscrewing operation is realized.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the embodiment of the invention is to provide a torque self-control hydraulic tubing tong.
In order to solve the technical problems, the invention provides the following technical scheme:
a torque self-control hydraulic tubing tong comprises a hydraulic oil tank, an oil pump, a torque control box, a motor and a pipe tong body, wherein the oil pump is used for conveying oil in the hydraulic oil tank to the motor from the torque control box, the motor is used for driving the pipe tong body to operate,
a channel for oil to flow through, a sliding cavity communicated with the channel and an oil storage branch channel communicated with the channel are arranged in the torque control box,
the inside of the sliding cavity is provided with a power supply part, an electromagnet, a permanent magnet and a blocking block, one end of the blocking block extends into the channel and is used for blocking oil liquid flowing through the channel,
the permanent magnet is fixedly arranged on one side of the blocking block facing the electromagnet and is matched with the electromagnet to generate attraction force,
a conductive core and a current regulating part are arranged in the oil storage branch passage, one end of the conductive core extends into the sliding cavity and is connected with the electromagnet,
the current adjusting part is movably arranged in the oil storage branch channel and is attached to the conductive core, and the power supply part is electrically connected with the current adjusting part.
As a further improvement of the invention: the channel comprises an oil inlet channel, an oil pressure adjusting channel and an oil discharge channel which are communicated in sequence,
the oil inlet channel is far away from one end of the oil pressure adjusting channel and connected with the oil pump, the oil discharge channel is far away from one end of the oil pressure adjusting channel and connected with the motor, one end of the sliding cavity is communicated with the oil pressure adjusting channel, one end of the plugging block extends to the inside of the oil pressure adjusting channel, and one end of the oil storage branch channel is communicated with the oil inlet channel.
As a further improvement of the invention: the current regulating part comprises a lifting pipe shell and a conducting ring fixedly arranged in the lifting pipe shell,
one end of the conductive core, which is far away from the electromagnet, extends into the lifting pipe shell and is attached to the inner wall of the conductive ring, and the power supply part is connected with the conductive ring through a conducting wire.
As a further improvement of the invention: the sliding cavity is fixedly provided with a supporting plate, the electromagnet is fixedly installed on one side of the supporting plate, and the supporting plate is connected with the blocking block through a first elastic body.
As a still further improvement of the invention: the oil storage branch channel is internally and fixedly provided with a supporting block, the conductive core penetrates through the supporting block and is fixedly connected with the supporting block,
the supporting block is connected with the lifting pipe shell through a second elastic body, one side of the torque control box is further connected with an oil unloading pipe, one end of the oil unloading pipe is communicated with the oil inlet channel, the other end of the oil unloading pipe is communicated with the hydraulic oil tank, and a valve is mounted on the oil unloading pipe.
As a still further improvement of the invention: the first elastic body and the second elastic body are springs or elastic sheets.
As a still further improvement of the invention: and a reversing valve is arranged between the torque control box and the motor and used for changing the flow direction of oil entering the motor.
Compared with the prior art, the invention has the beneficial effects that:
in the embodiment of the invention, the current transmitted to the electromagnet by the power supply part is gradually increased by the movement of the current adjusting part in the oil storage branch channel, so that the magnetic force generated by the electromagnet is gradually increased to attract the blocking block to continuously move towards the inside of the sliding cavity, the flux of oil liquid flowing through the channel is gradually increased, the output torque of the motor is gradually increased, the thread can be subjected to the gradually increased output torque in the screwing-in and unscrewing processes, and the thread sliding and even damage caused by overlarge initial torque are prevented.
Drawings
FIG. 1 is a schematic structural diagram of a torque control box in a torque self-control hydraulic tubing tong;
FIG. 2 is a schematic structural diagram of a torque self-control hydraulic tubing tong;
FIG. 3 is a schematic diagram of the connection between the lifting pipe shell and the conductive core in the torque self-control hydraulic tubing tong;
FIG. 4 is an enlarged view of area A of FIG. 1;
in the figure: 1-hydraulic oil tank, 2-oil pump, 3-torque control box, 31-oil discharge channel, 32-oil pressure adjusting channel, 33-oil inlet channel, 34-sliding cavity, 35-oil discharge pipe, 36-oil storage branch channel, 4-reversing valve, 5-motor, 6-pipe wrench body, 7-block, 8-power supply part, 81-first elastic body, 82-electromagnet, 83-support plate, 9-current adjusting part, 91-support block, 92-conductive core, 93-second elastic body, 94-conductive ring and 95-lifting pipe shell.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
Referring to fig. 1, 2 and 4, the embodiment provides a torque self-control hydraulic tubing tong, including a hydraulic oil tank 1, an oil pump 2, a torque control box 3, a motor 5 and a pipe tong body 6, where the oil pump 2 is configured to deliver oil inside the hydraulic oil tank 1 from the torque control box 3 to the motor 5, the motor 5 is configured to drive the pipe tong body 6 to operate, a channel through which the oil flows, a sliding cavity 34 communicated with the channel, and an oil storage branch channel 36 communicated with the channel are formed in the torque control box 3, a power supply portion 8, an electromagnet 82, a permanent magnet and a blocking block 7 are arranged inside the sliding cavity 34, one end of the blocking block 7 extends into the channel and is configured to block the oil flowing through the channel, the permanent magnet is fixedly disposed on one side of the blocking block 7 facing the electromagnet 82, the electromagnetic oil storage branch passage 36 is internally provided with a conductive core 92 and a current adjusting part 9, one end of the conductive core 92 extends into the sliding cavity 34 and is connected with the electromagnet 82, the current adjusting part 9 is movably arranged in the oil storage branch passage 36 and is attached to the conductive core 92, and the power supply part 8 is electrically connected with the current adjusting part 9.
The oil in the hydraulic oil tank 1 is conveyed to the motor 5 from the torque control box 3 through the oil pump 2, the motor 5 is utilized to drive the pipe wrench body 6 to operate so as to carry out the screwing-on and unscrewing operation, when the oil flows through the torque control box 3, the oil can flow along the channel in the torque control box, in an initial state, one end of the block 7 extends into the channel so as to block the oil, along with the entering of the oil into the channel, the oil can enter the oil storage branch channel 36, the current regulating part 9 is further pushed to move along the inside of the oil storage branch channel 36, the current regulating part 9 slides along the conductive core 92, the current output by the power supply part 8 flows through the current regulating part 9 and is conveyed to the electromagnet 82 through the conductive core 92, so that the electromagnet 82 is electrified to generate magnetism, and then the attraction is generated to the permanent magnet, so as to drive the block 7 to move towards the inside of the sliding cavity 34, thereby opening the channel, so that the oil is pumped to the motor 5, and the starting of the motor 5 is realized, in the process that the current adjusting part 9 slides along the conductive core 92, the length of the current flowing through the conductive core 92 is shortened, so that the current conveyed to the electromagnet 82 is increased, the magnetic force is increased, the attraction force of the electromagnet 82 to the permanent magnet is increased, the blocking block 7 is continuously moved to the inside of the sliding cavity 34, the opening degree of the channel is continuously increased, the flux and the pressure of the oil are improved, and the torque output of the motor 5 is improved.
Referring to fig. 1, in an embodiment, the passages include an oil inlet passage 33, an oil pressure adjusting passage 32, and an oil discharge passage 31, which are sequentially communicated, where one end of the oil inlet passage 33, which is far away from the oil pressure adjusting passage 32, is connected to the oil pump 2, one end of the oil discharge passage 31, which is far away from the oil pressure adjusting passage 32, is connected to the motor 5, one end of the sliding cavity 34 is communicated with the oil pressure adjusting passage 32, one end of the blocking block 7 extends into the oil pressure adjusting passage 32, and one end of the oil storage branch passage 36 is communicated with the oil inlet passage 33.
In another embodiment, the passage may also include a straight oil passage extending straight through the torque control box 3, with which the oil reserve passage 36 and the slide chamber 34 communicate.
Referring to fig. 3 and 4, in an embodiment, the current adjusting portion 9 includes a lifting shell 95 and a conducting ring 94 fixedly disposed inside the lifting shell 95, one end of the conducting core 92 away from the electromagnet 82 extends into the lifting shell 95 and is attached to an inner wall of the conducting ring 94, and the power supply portion 8 is connected to the conducting ring 94 through a conducting wire.
When the oil enters the oil inlet passage 33, a part of the oil can enter the oil storage branch passage 36, and further the elevator tube shell 95 is pushed to move, so as to drive the conductive ring 94 to move synchronously, the conductive ring 94 can slide along the conductive core 92 when moving, at this time, the current output by the power supply part 8 flows through the conductive ring 94 through the conductive wire, then flows through the conductive core 92 through the conductive ring 94, and is conveyed to the electromagnet 82 from the conductive core 92, when the conductive ring 94 slides along the conductive core 92, the distance of the current flowing through the conductive core 92 is shortened, the resistance is reduced, the current of the electromagnet 82 is increased, and further the magnetic force is increased, so as to gradually suck the block 7 into the sliding cavity 34, in the process that the block 7 moves towards the inside of the sliding cavity 34, the oil pressure in the oil pressure adjusting passage 32 is gradually increased, further the flux of the oil is increased, the output torque of the motor 5 is increased, so that the screw thread can be subjected to increasing output torque in the process of screwing and unscrewing, thereby preventing the thread from slipping and even being damaged due to the overlarge initial torque.
In another embodiment, the current adjusting portion 9 may further include a floating plate movably disposed inside the oil storage branch passage 36 and a metal sheet fixedly disposed on one side of the floating plate, one end of the metal sheet far away from the floating plate is attached to the sidewall of the conductive core 92, and the power supply portion 8 is connected to the metal sheet through a wire.
When fluid gets into inside the oil feed passageway 33, inside some fluid can get into oil storage branch way 36, and then promote the kickboard and move along oil storage branch way 36 inside, in order to drive the sheetmetal removal, can slide along conductive core 92 one side when the sheetmetal removes, in order to shorten the length that the electric current flows through conductive core 92, and then reduce resistance, increase electromagnet 82's electric current and magnetic force, in order to the suction that lasts sprue 7 to sliding chamber 34 inside, make the aperture of oil pressure regulating channel 32 continuously increase, realize the continuous increase of motor 5 output torque.
In an embodiment, the power supply portion 8 may be a storage battery, or may be an external power grid, which is not limited herein.
Referring to fig. 1, in one embodiment, a supporting plate 83 is fixedly disposed inside the sliding cavity 34, the electromagnet 82 is fixedly mounted on one side of the supporting plate 83, and the supporting plate 83 is connected to the block 7 through a first elastic body 81.
Elastic supporting force is exerted on the blocking piece 7 through the first elastic body 81, when the blocking piece 7 is not used, the first elastic body 81 can enable the blocking piece 7 to be abutted to the inside of the oil pressure adjusting channel 32 to completely block the oil pressure adjusting channel 32, in the process that the follow-up electromagnet 82 is electrified and the current is gradually increased, the blocking piece 7 is attracted through the increase of the magnetic force of the electromagnet 82, the supporting force of the first elastic body 81 can be overcome in the process, and the blocking piece 7 can be guaranteed to continuously move towards the inside of the sliding cavity 34.
Referring to fig. 1, 3 and 4, in an embodiment, a supporting block 91 is fixedly disposed inside the oil storage branch passage 36, the conductive core 92 penetrates through the supporting block 91 and is fixedly connected to the supporting block 91, the supporting block 91 is connected to the lifting pipe housing 95 through a second elastic body 93, an oil discharge pipe 35 is further connected to one side of the torque control box 3, one end of the oil discharge pipe 35 is communicated with the oil inlet passage 33, the other end of the oil discharge pipe is communicated with the hydraulic oil tank 1, and a valve is mounted on the oil discharge pipe 35.
After the threading and the unthreading are finished, the valve is opened, oil in the oil inlet channel 33 can flow back to the inside of the hydraulic oil tank 1 through the oil discharge pipe 35, and at the moment, the lifting pipe shell 95 can be driven to move reversely in the oil storage branch channel 36 under the supporting action of the second elastic body 93 so as to drive the conducting ring 94 to move reversely, so that the resetting of the lifting pipe shell 95 and the conducting ring 94 is realized, and the next use is facilitated.
In an embodiment, the first elastic body 81 and the second elastic body 93 may be a spring or a leaf spring, which is not limited herein.
Referring to fig. 2, in an embodiment, a reversing valve 4 is disposed between the torque control box 3 and the motor 5, the reversing valve 4 is used for changing a flow direction of oil entering the motor 5, so as to change a running direction of the pipe wrench body 6, so as to switch a threading operation and a threading operation, and the reversing valve 4 is a three-position four-way reversing valve.
In the embodiment of the invention, the current supplied to the electromagnet 82 by the power supply part 8 is gradually increased by the movement of the current regulating part 9 in the oil storage branch passage 36, so that the magnetic force generated by the electromagnet 82 is gradually increased to attract the blocking block 7 to continuously move towards the inside of the sliding cavity 34, so that the flux of oil liquid flowing through the passage is gradually increased, and the output torque of the motor 5 is gradually increased, so that the thread can be subjected to the gradually increased output torque in the screwing-in and unscrewing processes, and the thread slipping and even damage caused by overlarge initial torque are prevented.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (7)
1. A torque self-control hydraulic tubing tong comprises a hydraulic oil tank, an oil pump, a torque control box, a motor and a pipe tong body, wherein the oil pump is used for conveying oil in the hydraulic oil tank to the motor from the torque control box, the motor is used for driving the pipe tong body to operate, and the torque self-control hydraulic tubing tong is characterized in that,
a channel for oil to flow through, a sliding cavity communicated with the channel and an oil storage branch channel communicated with the channel are arranged in the torque control box,
the inside of the sliding cavity is provided with a power supply part, an electromagnet, a permanent magnet and a blocking block, one end of the blocking block extends into the channel and is used for blocking oil liquid flowing through the channel,
the permanent magnet is fixedly arranged on one side of the blocking block facing the electromagnet and is matched with the electromagnet to generate attraction force,
a conductive core and a current regulating part are arranged in the oil storage branch passage, one end of the conductive core extends into the sliding cavity and is connected with the electromagnet,
the current adjusting part is movably arranged in the oil storage branch channel and is attached to the conductive core, and the power supply part is electrically connected with the current adjusting part.
2. The torque self-control hydraulic tubing tong of claim 1, wherein the passage comprises an oil inlet passage, an oil pressure regulating passage and an oil discharge passage which are communicated in sequence,
the oil inlet channel is far away from one end of the oil pressure adjusting channel and connected with the oil pump, the oil discharge channel is far away from one end of the oil pressure adjusting channel and connected with the motor, one end of the sliding cavity is communicated with the oil pressure adjusting channel, one end of the plugging block extends to the inside of the oil pressure adjusting channel, and one end of the oil storage branch channel is communicated with the oil inlet channel.
3. The torque self-control hydraulic tubing tong of claim 1, wherein the current regulating part comprises a lifting shell and a conducting ring fixedly arranged inside the lifting shell,
one end of the conductive core, which is far away from the electromagnet, extends into the lifting pipe shell and is attached to the inner wall of the conductive ring, and the power supply part is connected with the conductive ring through a conducting wire.
4. The torque self-control hydraulic tubing tong of claim 1, wherein a support plate is fixedly arranged inside the sliding cavity, the electromagnet is fixedly arranged on one side of the support plate, and the support plate is connected with the block through a first elastic body.
5. The torque self-control hydraulic tubing tong of claim 4, wherein a support block is fixedly arranged inside the oil storage branch passage, the conductive core penetrates through the support block and is fixedly connected with the support block,
the supporting block is connected with the lifting pipe shell through a second elastic body, one side of the torque control box is further connected with an oil unloading pipe, one end of the oil unloading pipe is communicated with the oil inlet channel, the other end of the oil unloading pipe is communicated with the hydraulic oil tank, and a valve is mounted on the oil unloading pipe.
6. The torque self-controlling hydraulic tubing tong of claim 5, wherein the first and second elastic bodies are springs or clips.
7. The torque self-control hydraulic tubing tong of claim 1, wherein a reversing valve is arranged between the torque control box and the motor and used for changing the flow direction of oil entering the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111052661.5A CN113513280B (en) | 2021-09-09 | 2021-09-09 | Torque self-control hydraulic oil pipe tongs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111052661.5A CN113513280B (en) | 2021-09-09 | 2021-09-09 | Torque self-control hydraulic oil pipe tongs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113513280A true CN113513280A (en) | 2021-10-19 |
| CN113513280B CN113513280B (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111052661.5A Active CN113513280B (en) | 2021-09-09 | 2021-09-09 | Torque self-control hydraulic oil pipe tongs |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2375758Y (en) * | 1998-12-11 | 2000-04-26 | 靳占忠 | Hydraulic tongs torque self-controlling device |
| CN2637707Y (en) * | 2003-01-09 | 2004-09-01 | 何卫东 | Torque self control type hydraulic oil pipepliers |
| CN106194070A (en) * | 2016-08-30 | 2016-12-07 | 杨若森 | There is the workover fluid pressing tongs of remote control |
| CN112246439A (en) * | 2020-10-19 | 2021-01-22 | 温州市仿浩电子科技有限公司 | Flue gas purification device with electrostatic plate dust removal function |
| CN112482180A (en) * | 2020-11-25 | 2021-03-12 | 程仙娣 | Road surface marking device of self-interacting coating supply volume |
| CN112901436A (en) * | 2021-03-19 | 2021-06-04 | 浙江工业大学 | Three-point contact overlapping rolling type two-dimensional piston pump |
| CN213493570U (en) * | 2020-09-01 | 2021-06-22 | 湖北西建新材料科技有限公司 | Electromagnetic control water reducing agent conveying device |
-
2021
- 2021-09-09 CN CN202111052661.5A patent/CN113513280B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2375758Y (en) * | 1998-12-11 | 2000-04-26 | 靳占忠 | Hydraulic tongs torque self-controlling device |
| CN2637707Y (en) * | 2003-01-09 | 2004-09-01 | 何卫东 | Torque self control type hydraulic oil pipepliers |
| CN106194070A (en) * | 2016-08-30 | 2016-12-07 | 杨若森 | There is the workover fluid pressing tongs of remote control |
| CN213493570U (en) * | 2020-09-01 | 2021-06-22 | 湖北西建新材料科技有限公司 | Electromagnetic control water reducing agent conveying device |
| CN112246439A (en) * | 2020-10-19 | 2021-01-22 | 温州市仿浩电子科技有限公司 | Flue gas purification device with electrostatic plate dust removal function |
| CN112482180A (en) * | 2020-11-25 | 2021-03-12 | 程仙娣 | Road surface marking device of self-interacting coating supply volume |
| CN112901436A (en) * | 2021-03-19 | 2021-06-04 | 浙江工业大学 | Three-point contact overlapping rolling type two-dimensional piston pump |
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| CN113513280B (en) | 2021-12-14 |
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