CN115142802A - Backup tong for marine top drive - Google Patents
Backup tong for marine top drive Download PDFInfo
- Publication number
- CN115142802A CN115142802A CN202210834019.0A CN202210834019A CN115142802A CN 115142802 A CN115142802 A CN 115142802A CN 202210834019 A CN202210834019 A CN 202210834019A CN 115142802 A CN115142802 A CN 115142802A
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- assembly
- slip
- inner cylinder
- rectangular
- telescopic
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- 239000000725 suspension Substances 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 241000227287 Elliottia pyroliflora Species 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- 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
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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 relates to a back-up tong for marine top drive, which comprises: a cantilever part and a clamping part; the top of the cantilever part is connected with the back of the top drive; the bottom of the cantilever part is connected with the clamping part; wherein the cantilever portion includes: the device comprises a reaction torque outer cylinder unit, a reaction torque inner cylinder unit and a suspension telescopic unit; the top of the counter torque outer cylinder unit is connected with the back of the top drive; the reaction torque inner cylinder unit is connected with the reaction torque outer cylinder unit through the suspension telescopic unit; the reaction torque inner cylinder unit realizes the telescopic function of the cantilever part by means of the suspension telescopic unit; the bottom of the anti-torque inner cylinder unit is connected with the clamping part; the clamping part can realize the screw thread centering of the drill rod and the top drive main shaft by means of the expansion of the cantilever part. The back-up tong for marine top drive provided by the invention has a telescopic function, and can be used for aligning a drill rod with a main shaft screw thread and protecting the screw thread.
Description
Technical Field
The invention belongs to the technical field of marine exploration top drive, and particularly relates to a back-up wrench for marine top drive.
Background
When a drill rod is replaced by a main shaft of a marine top drive in the field of marine exploration, back-up tong equipment is needed to clamp an original drill rod for screwing-off operation or clamp a new drill rod to be aligned with the main shaft for installation.
The existing back-up tong cannot meet the requirements, and meanwhile, the problems of complex structure, easiness in damage, poor flexibility and the like exist.
Disclosure of Invention
Technical problem to be solved
Aiming at the existing technical problems, the invention provides a back-up tong for marine top drive, which solves the problems that the back-up tong needs to be stretched in height to meet the centering of a drill rod screw thread and the back-up tong clamping oil cylinder is easy to damage when a top drive main shaft screw thread is screwed and unscrewed.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a backup wrench for marine top drives, comprising: a cantilever part and a clamping part;
the top of the cantilever part is connected with the back of the top drive;
the bottom of the cantilever part is connected with the clamping part;
wherein the cantilever portion includes: the device comprises a reaction torque outer cylinder unit, a reaction torque inner cylinder unit and a suspension telescopic unit;
the top of the counter torque outer cylinder unit is connected with the back of the top drive;
the reaction torque inner cylinder unit is connected with the reaction torque outer cylinder unit through the suspension telescopic unit;
the reaction torque inner cylinder unit realizes the telescopic function of the cantilever part by means of the suspension telescopic unit;
the bottom of the anti-torque inner cylinder unit is connected with the clamping part;
the clamping part can realize the screw thread centering of the drill rod and the top drive main shaft by means of the expansion of the cantilever part.
Preferably, the reaction torque outer cylinder unit includes: the upper connecting component is connected with the upper end of the rectangular outer cylinder;
the upper connecting assembly is arranged on the side surface of the top of the rectangular outer barrel;
the top of the rectangular outer barrel is provided with an outer barrel cover;
the rectangular outer cylinder can be fixedly arranged on the back of the top drive by means of the upper connecting assembly;
the lifting ring oil cylinder base is arranged on the outer wall of the rectangular outer cylinder and is used for arranging an oil cylinder of the lifting ring.
Preferably, the reaction torque inner tube unit includes: the rectangular inner cylinder, the inner cylinder upper sealing assembly and the lower connecting assembly;
the inner cylinder upper seal assembly is arranged inside the rectangular inner cylinder and is connected with the inner wall of the rectangular inner cylinder;
the lower connecting assembly is fixedly arranged at the bottom of the rectangular inner cylinder;
the rectangular inner cylinder is connected to the clamping portion by means of the lower connecting member.
Preferably, the suspension telescopic unit includes: the telescopic oil cylinder, the bottom tray component and the double-floating spring component are arranged on the bottom tray;
the top of the telescopic oil cylinder is connected with the upper connecting component in the rectangular outer cylinder through a bolt;
a telescopic shaft of the telescopic oil cylinder penetrates through the inner cylinder upper seal assembly to enter the rectangular inner cylinder;
the bottom of the telescopic shaft is fixedly connected with the bottom tray assembly;
the floating spring assembly is disposed on the bottom tray assembly.
Preferably, the double floating spring assembly comprises: the first floating spring, the second floating spring, the first spring guide rod and the second spring guide rod;
the first spring guide rod and the second spring guide rod are symmetrically and vertically fixed on the bottom tray component;
the first floating spring and the second floating spring are sleeved on the first spring guide rod and the second spring guide rod respectively.
Preferably, the inner cylinder upper seal assembly is provided with a first through hole, a second through hole and a third through hole;
the first and second perforations are the same size;
the first through hole and the second through hole are respectively used for the penetration of the first spring guide rod and the second spring guide rod;
the third perforation is centrally sized;
the first through hole and the second through hole are symmetrically arranged on two sides of the third through hole;
the size of the third through hole is matched with the telescopic shaft of the telescopic oil cylinder, and the third through hole is used for the telescopic shaft of the telescopic oil cylinder to penetrate through;
the end parts of the first spring guide rod and the second spring guide rod which penetrate through the inner cylinder upper seal assembly are nuts and pins for limiting on the inner cylinder upper seal assembly.
Preferably, a self-lubricating copper sleeve is sleeved on the bottom tray component;
the bottom tray assembly can be in contact with the inner wall of the rectangular inner cylinder by means of the self-lubricating copper sleeve;
the rectangular outer barrel is provided with a detection window;
a guide compensation device is also arranged between the rectangular outer cylinder and the rectangular inner cylinder;
the detection window can be opened or closed, and the guide compensation device can be replaced.
Preferably, the clamping portion includes: the slip clamping device comprises a rectangular box body, a first slip clamping assembly and a second slip clamping assembly;
a channel which is communicated up and down and is suitable for a drill rod to penetrate through is arranged in the middle of the rectangular box body;
the first slip clamping assembly and the second slip clamping assembly are symmetrically arranged in the rectangular box body on two sides of the channel;
the first slip gripping assembly and the second slip gripping assembly are capable of cooperatively gripping a pipe passing through the passage;
and a bell mouth assembly is arranged at the lower port of the channel so as to facilitate the drill rod to be aligned with the channel port for penetrating.
Preferably, the first slip gripping assembly and the second slip gripping assembly are identical in structure;
wherein the first slip gripping assembly comprises: the slip comprises a slip oil cylinder, a spherical universal joint, a slip seat and a split type slip block;
the slip oil cylinder is connected with the spherical universal joint;
the slip seat is connected with the spherical universal joint;
the split slip block is detachably arranged on the slip seat;
when the slip oil cylinder pushes the spherical universal joint, the spherical universal joint drives the slip seat and the split type slip block to clamp a drill rod in the channel.
Preferably, the rectangular box body is provided with a connecting component;
the rectangular box body is connected with the rectangular inner cylinder through the connecting assembly and the lower connecting assembly;
end covers are arranged at two ends of the rectangular box body;
the end covers are detachably connected with the two ends of the rectangular box body.
(III) advantageous effects
The invention has the beneficial effects that: the back-up tong for marine top drive provided by the invention has the following beneficial effects:
(1) The back-up tong has a telescopic function, so that the screw thread of the drill rod and the main shaft can be aligned and protected.
(2) The self-floating butt-clamping slip structure meets the requirement of automatic alignment by taking the center of a drill rod as the slip center.
(3) The adjustable telescopic cylinder guiding compensation structure meets the requirements of wear compensation and flexible alignment in the operation process.
(4) The split type change of big slips and small slips saves operating space, reduces the change degree of difficulty.
Drawings
FIG. 1 is a schematic side view of a back-up tong for marine top drive according to the present invention;
FIG. 2 is a schematic structural diagram of a three-dimensional view angle of a back-up tong for marine top drive according to the present invention;
FIG. 3 is a schematic structural diagram of a reactive torque inner barrel unit in a back-up tong for marine top drive according to the present invention;
FIG. 4 is a schematic structural diagram of a reactive torque outer cylinder unit in a back-up wrench for marine top drive according to the present invention;
FIG. 5 is a cross-sectional view of a cantilever portion of a back-up tong for a marine top drive according to the present invention;
fig. 6 is a schematic structural view of a clamping portion of the back-up tong for marine top drive according to the present invention.
[ description of reference ]
1: an upper connection assembly; 2: a rectangular outer cylinder; 3: a lifting ring oil cylinder base; 4: detecting a window; 5: a rectangular inner cylinder; 6: a lower connection assembly; 7: an inner cylinder upper seal assembly; 8: a telescopic oil cylinder; 9: a bottom tray assembly; 10: a first spring guide; 11: a first floating spring; 12: a rectangular box body; 13: a bell mouth; 14: a connecting assembly; 15: a slip cylinder; 16: a spherical universal joint; 17: a slip seat; 18: a split slip block.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1-6: a back-up tong for marine top drive, comprising: a cantilever part and a clamping part; the top of the cantilever part is connected with the back of the top drive; the bottom of the cantilever part is connected with the clamping part. The cantilever part has a telescopic function and can synchronously drive the clamping part to ascend and descend so as to realize accurate centering or screwing-off of the drill rod and the top drive main shaft.
Wherein the cantilever portion includes: the device comprises a reaction torque outer cylinder unit, a reaction torque inner cylinder unit and a suspension telescopic unit; the top of the counter torque outer cylinder unit is connected with the back of the top drive; the reaction torque inner cylinder unit is connected with the reaction torque outer cylinder unit through the suspension telescopic unit.
In detail, the reaction torque inner cylinder unit realizes the telescopic function of the cantilever part by means of the suspension telescopic unit; the bottom of the anti-torque inner cylinder unit is connected with the clamping part; the clamping part can realize the screw thread centering of the drill rod and the top drive main shaft by means of the expansion of the cantilever part.
The reaction torque outer cylinder unit in the embodiment comprises: the oil cylinder comprises a rectangular outer cylinder 2, an upper connecting component 1 and a lifting ring oil cylinder base 3.
The upper connecting assembly 1 is arranged on the side surface of the top of the rectangular outer barrel 2; the top of the rectangular outer barrel 2 is provided with an outer barrel cover; the rectangular outer cylinder 2 can be fixedly arranged on the back of the top drive by means of the upper connecting component 1.
It should be noted that: the upper connecting assembly 1 is a mechanical connecting assembly, and the components are firmly connected with each other mainly through bolts. The lifting ring oil cylinder base 3 is installed on the outer wall of the rectangular outer cylinder 2 and is used for arranging an oil cylinder of a lifting ring. The lifting ring oil cylinder base 3 is arranged on the rectangular outer cylinder 2, so that the space utilization rate of the top drive system can be further optimized, the occupied space is reduced, and a good foundation is laid for realizing the miniaturization arrangement of the system on a marine vessel.
The reactive torque inner cylinder unit described in this embodiment includes: a rectangular inner cylinder 5, an inner cylinder upper sealing component 7 and a lower connecting component 6.
In detail, the inner cylinder upper sealing component 7 is arranged inside the rectangular inner cylinder 5 and is connected with the inner wall of the rectangular inner cylinder 5; the lower connecting assembly 6 is fixedly arranged at the bottom of the rectangular inner cylinder 5; the rectangular inner cylinder 5 is connected to the clamping part by means of the lower connecting piece 6. The rectangular inner cylinder 5 is suspended in the rectangular outer cylinder 2 by means of the cooperation of the inner cylinder upper seal assembly 7 and the suspension telescopic unit.
The suspension extension unit described in this embodiment includes: the telescopic oil cylinder 8, the bottom tray assembly 9 and the double-floating spring assembly; the top of the telescopic oil cylinder 8 is arranged in the rectangular outer cylinder and is connected with the upper connecting component 1 through a bolt. The telescopic shaft of the telescopic oil cylinder 8 penetrates through the inner cylinder upper seal assembly 7 to enter the rectangular inner cylinder 5; the bottom of the telescopic shaft is fixedly connected with the bottom tray assembly 9; the floating spring assembly is disposed on the bottom tray assembly 9.
In detail, the double floating spring assembly includes: a first floating spring 11, a second floating spring, a first spring guide 10 and a second spring guide.
The first spring guide rod 10 and the second spring guide rod are symmetrically and vertically fixed on the bottom tray assembly 9; the first floating spring 11 and the second floating spring are respectively sleeved on the first spring guide rod 10 and the second spring guide rod.
In this embodiment, the inner cylinder upper seal assembly 7 is provided with a first through hole, a second through hole and a third through hole; the first and second perforations are the same size; the first through hole and the second through hole are respectively used for the penetration of the first spring guide rod 10 and the second spring guide rod.
Accordingly, the third perforation is centrally sized; the first through hole and the second through hole are symmetrically arranged on two sides of the third through hole; the size of the third through hole is matched with the telescopic shaft of the telescopic oil cylinder 8, and the telescopic shaft of the telescopic oil cylinder 8 penetrates through the third through hole.
The end parts of the first spring guide rod 10 and the second spring guide rod which penetrate through the inner cylinder upper seal component 7 are nuts and pins for limiting on the inner cylinder upper seal component 7.
A self-lubricating copper sleeve is sleeved on the bottom tray component 9 in the embodiment; the bottom tray assembly 9 can be in contact with the inner wall of the rectangular inner cylinder 5 by means of the self-lubricating copper bush.
The rectangular outer barrel 2 is provided with a detection window 4; a guide compensation device is also arranged between the rectangular outer cylinder 2 and the rectangular inner cylinder 5; the inspection window 4 can be opened or closed for replacing the guide compensation device.
It should be noted that: the guiding compensation device is a copper pad attached to the inner wall of the rectangular outer barrel 2.
The clamping part described in this embodiment includes: the slip clamping device comprises a rectangular box body 12, a first slip clamping assembly and a second slip clamping assembly; and a channel which is communicated up and down and is suitable for a drill rod to penetrate through is arranged in the middle of the rectangular box body 12.
The first slip clamping assembly and the second slip clamping assembly are symmetrically arranged in the rectangular box body 12 on two sides of the channel; the first slip gripping assembly and the second slip gripping assembly are capable of cooperatively gripping a pipe passing through the passage; in detail, the lower port of the passage is provided with a bell mouth assembly 13 for facilitating the drilling rod to be inserted in alignment with the passage port.
In the embodiment, the first slip clamping assembly and the second slip clamping assembly have the same structure; wherein the first slip gripping assembly comprises: a slip oil cylinder 15, a spherical universal joint 16, a slip seat 17 and a split slip block 18.
The slip oil cylinder 15 is connected with the spherical universal joint 16; the slip seat 17 is connected with the spherical universal joint 16; the split slip segments 18 are removably mounted to the slip bowl 17.
When the slip oil cylinder 15 pushes the spherical universal joint 16, the spherical universal joint 16 drives the slip seat 17 and the split type slip block 18 to clamp a drill rod in the channel.
The rectangular box body 12 in the embodiment is provided with a connecting component 14; the rectangular box body 12 is connected with the rectangular inner cylinder 5 through the connecting assembly 14 and the lower connecting assembly 6; two ends of the rectangular box body 12 are respectively provided with an end cover; the end caps are detachably connected with two ends of the rectangular box body 12.
It should be noted that: the arrangement of the end cover can facilitate the quick maintenance or the replacement of parts when the parts such as the slip oil cylinder 15 in the rectangular box body 12 and the like have faults.
The foregoing describes the technical principles of the present invention in conjunction with specific embodiments, which are provided for the purpose of illustrating the principles of the present invention and are not to be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, which shall fall within the scope of the present invention.
Claims (10)
1. A back-up tong for marine top drive is characterized by comprising: a cantilever portion and a clamping portion;
the top of the cantilever part is connected with the back of the top drive;
the bottom of the cantilever part is connected with the clamping part;
wherein the cantilever portion includes: the device comprises a reaction torque outer cylinder unit, a reaction torque inner cylinder unit and a suspension telescopic unit;
the top of the counter torque outer cylinder unit is connected with the back of the top drive;
the reaction torque inner cylinder unit is connected with the reaction torque outer cylinder unit through the suspension telescopic unit;
the reaction torque inner cylinder unit realizes the telescopic function of the cantilever part by means of the suspension telescopic unit;
the bottom of the anti-torque inner cylinder unit is connected with the clamping part;
the clamping part can realize the screw thread centering of the drill rod and the top drive main shaft by means of the expansion of the cantilever part.
2. Back-up tong according to claim 1,
the reactive torque outer cylinder unit includes: the upper connecting component is connected with the upper end of the rectangular outer cylinder;
the upper connecting assembly is arranged on the side surface of the top of the rectangular outer barrel;
the top of the rectangular outer barrel is provided with an outer barrel cover;
the rectangular outer cylinder can be fixedly arranged on the back of the top drive by means of the upper connecting assembly;
the lifting ring oil cylinder base is arranged on the outer wall of the rectangular outer cylinder and is used for arranging an oil cylinder of the lifting ring.
3. Back-up tong according to claim 2,
the reaction torque inner tube unit includes: the rectangular inner cylinder, the inner cylinder upper sealing assembly and the lower connecting assembly are arranged in the rectangular inner cylinder;
the inner cylinder upper sealing assembly is arranged inside the rectangular inner cylinder and is connected with the inner wall of the rectangular inner cylinder;
the lower connecting assembly is fixedly arranged at the bottom of the rectangular inner cylinder;
the rectangular inner cylinder is connected to the clamping portion by means of the lower connecting member.
4. Back-up tong according to claim 3,
the suspension telescopic unit comprises: the telescopic oil cylinder, the bottom tray component and the double-floating spring component are arranged on the bottom tray;
the top of the telescopic oil cylinder is connected with the upper connecting component in the rectangular outer cylinder through a bolt;
a telescopic shaft of the telescopic oil cylinder penetrates through the inner cylinder upper seal assembly to enter the rectangular inner cylinder;
the bottom of the telescopic shaft is fixedly connected with the bottom tray assembly;
the floating spring assembly is disposed on the bottom tray assembly.
5. Back-up tong according to claim 4,
the double floating spring assembly includes: the device comprises a first floating spring, a second floating spring, a first spring guide rod and a second spring guide rod;
the first spring guide rod and the second spring guide rod are symmetrically and vertically fixed on the bottom tray component;
the first floating spring and the second floating spring are sleeved on the first spring guide rod and the second spring guide rod respectively.
6. Back-up tong according to claim 5,
the inner cylinder upper seal assembly is provided with a first through hole, a second through hole and a third through hole;
the first and second perforations are the same size;
the first through hole and the second through hole are respectively used for the penetration of the first spring guide rod and the second spring guide rod;
the third perforation is centrally sized;
the first through hole and the second through hole are symmetrically arranged on two sides of the third through hole;
the size of the third through hole is matched with the telescopic shaft of the telescopic oil cylinder, and the third through hole is used for the telescopic shaft of the telescopic oil cylinder to penetrate through;
the end parts of the first spring guide rod and the second spring guide rod which penetrate through the inner cylinder upper seal assembly are nuts and pins for limiting on the inner cylinder upper seal assembly.
7. Back-up tong according to claim 6,
a self-lubricating copper sleeve is sleeved on the bottom tray component;
the bottom tray assembly can be in contact with the inner wall of the rectangular inner cylinder by means of the self-lubricating copper sleeve;
the rectangular outer barrel is provided with a detection window;
a guide compensation device is also arranged between the rectangular outer cylinder and the rectangular inner cylinder;
the detection window can be opened or closed, and the guide compensation device is replaced.
8. Back-up tong according to claim 7,
the clamping portion includes: the slip clamping device comprises a rectangular box body, a first slip clamping assembly and a second slip clamping assembly;
a channel which is communicated up and down and is suitable for a drill rod to penetrate through is arranged in the middle of the rectangular box body;
the first slip clamping assembly and the second slip clamping assembly are symmetrically arranged in the rectangular box body on two sides of the channel;
the first slip gripping assembly and the second slip gripping assembly are capable of cooperatively gripping a pipe passing through the passage;
and a bell mouth assembly is arranged at the lower port of the channel so as to facilitate the drill rod to be aligned with the channel port for penetrating.
9. Back-up tong according to claim 8,
the first slip clamping assembly and the second slip clamping assembly are identical in structure;
wherein the first slip gripping assembly comprises: the slip comprises a slip oil cylinder, a spherical universal joint, a slip seat and a split type slip block;
the slip oil cylinder is connected with the spherical universal joint;
the slip seat is connected with the spherical universal joint;
the split slip blocks are detachably arranged on the slip seats;
when the slip oil cylinder pushes the spherical universal joint, the spherical universal joint drives the slip seat and the split type slip block to clamp a drill rod in a channel.
10. Back-up tong according to claim 9,
the rectangular box body is provided with a connecting assembly;
the rectangular box body is connected with the rectangular inner cylinder through the connecting assembly and the lower connecting assembly;
end covers are arranged at two ends of the rectangular box body;
the end covers are detachably connected with the two ends of the rectangular box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210834019.0A CN115142802A (en) | 2022-07-14 | 2022-07-14 | Backup tong for marine top drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210834019.0A CN115142802A (en) | 2022-07-14 | 2022-07-14 | Backup tong for marine top drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115142802A true CN115142802A (en) | 2022-10-04 |
Family
ID=83412821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210834019.0A Pending CN115142802A (en) | 2022-07-14 | 2022-07-14 | Backup tong for marine top drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115142802A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116586939A (en) * | 2023-06-26 | 2023-08-15 | 江苏如东联丰石油机械有限公司 | Novel top driving force pincers |
-
2022
- 2022-07-14 CN CN202210834019.0A patent/CN115142802A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116586939A (en) * | 2023-06-26 | 2023-08-15 | 江苏如东联丰石油机械有限公司 | Novel top driving force pincers |
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