CN114749949B - Hydraulic clamp locking mechanism capable of keeping clamping force - Google Patents
Hydraulic clamp locking mechanism capable of keeping clamping force Download PDFInfo
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- CN114749949B CN114749949B CN202210539776.5A CN202210539776A CN114749949B CN 114749949 B CN114749949 B CN 114749949B CN 202210539776 A CN202210539776 A CN 202210539776A CN 114749949 B CN114749949 B CN 114749949B
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- piston rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2703/00—Work clamping
- B23Q2703/02—Work clamping means
- B23Q2703/04—Work clamping means using fluid means or a vacuum
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- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention relates to a hydraulic clamp locking mechanism capable of maintaining clamping force. The invention comprises a slide bar, a large oil cylinder body and a small oil cylinder body; the sliding rod is connected to the mounting bottom plate in a sliding manner, and one end of the sliding rod is connected with a pressure head; the large oil cylinder body is connected to the mounting bottom plate, a large piston rod is arranged in the large oil cylinder body, and the large piston rod can move to drive the sliding rod to slide along the mounting bottom plate; little hydro-cylinder body one end is connected in big hydro-cylinder body side, and the little hydro-cylinder body other end is connected with the gas and examines the seat, is equipped with little piston rod in the little hydro-cylinder body, and little piston rod and big piston rod are mutually perpendicular, and little piston rod one end can contact with big piston rod side in order to restrict the removal of big piston rod, and the little piston rod other end is connected with detects the piece, detects piece sliding connection in the gas and examines the seat, and the gas is examined the seat and is equipped with the gas port that is used for detecting the detection piece position. The hydraulic clamp can keep the clamping force of the hydraulic clamp for a long time when a machine tool fails or has power failure, so that the hydraulic clamp has wider adaptability and meets the requirement of automatic production.
Description
Technical Field
The invention relates to the technical field of hydraulic clamps, in particular to a hydraulic clamp locking mechanism capable of keeping clamping force.
Background
With the vigorous development of the manufacturing industry in China, various advanced processing technologies and processing equipment are continuously adopted by large processing manufacturers in large quantities, the manufacturers put forward higher and higher requirements on the precision and stability of the processing equipment, sudden power failure or equipment failure in the field of precision part processing causes great influence on production, most of the existing processing centers have an automatic resetting function of restarting, the influence on processing can be ignored, but a hydraulic clamp usually needs continuous oil supply of a hydraulic pump driven by electric energy to keep clamping force on parts to be processed, power failure can cause loosening action of the hydraulic clamp, secondary clamping after power on can cause partial precision loss or scrapping of the processed parts, and the traditional method of adding a hydraulic control one-way valve in an oil way has the defects of poor pressure maintaining effect and incapability of maintaining pressure for a long time. In this case, a hydraulic clamp locking mechanism capable of maintaining a stable clamping force for a long time even after power failure is required.
Disclosure of Invention
The invention aims to provide a hydraulic clamp locking mechanism capable of maintaining clamping force, which can maintain the clamping force of a hydraulic clamp for a long time when a machine tool fails or has power failure, so that the hydraulic clamp has wider adaptability and meets the requirement of automatic production.
In order to solve the above technical problem, the present invention provides a hydraulic clamp locking mechanism for maintaining a clamping force, including a mounting base plate, where the mounting base plate is used for connecting a hydraulic clamp required to maintain the clamping force, and further including: the device comprises a slide bar, a large oil cylinder body and a small oil cylinder body;
the sliding rod is connected to the mounting bottom plate in a sliding mode, and one end of the sliding rod is connected with a pressure head;
the large oil cylinder body is connected to the mounting bottom plate, a large piston rod is arranged in the large oil cylinder body, and the sliding rod can be driven to slide along the mounting bottom plate through the movement of the large piston rod;
the utility model discloses a pneumatic detection device, including a small oil cylinder body, big piston rod, little piston rod, gas detection seat, little oil cylinder body one end is connected in big oil cylinder body side, the little oil cylinder body other end is connected with the gas and examines the seat, be equipped with little piston rod in the little oil cylinder body, little piston rod and big piston rod are mutually perpendicular, little piston rod one end can contact with big piston rod side in order to restrict the removal of big piston rod, the little piston rod other end is connected with detects the piece, detect piece sliding connection in the gas detection seat, the gas detection seat is equipped with and is used for detecting the gas port that detects the piece and examine the seat internal position at gas.
In an embodiment of the present invention, the mounting base plate further includes a sliding sleeve and an oilless bushing, the sliding sleeve is connected to the mounting base plate, and the sliding rod is slidably connected to the sliding sleeve through the oilless bushing.
In one embodiment of the present invention, the number of the slide bars is two, and the two slide bars are symmetrically disposed on two sides of the large oil cylinder body.
In an embodiment of the invention, the connecting pressing plate further comprises a connecting pressing plate and an elastic pressing plate, the connecting pressing plate comprises a connecting middle seat and connecting arms symmetrically connected to two ends of the connecting middle seat, the two connecting arms are respectively connected with the other end of the sliding rod, the elastic pressing plate and the connecting middle seat are both connected to one end of the large piston rod, the connecting pressing plate is further provided with an installation groove, and the bottom end of the elastic pressing plate is abutted to the lower surface of the installation groove.
In one embodiment of the invention, the other end of the slide bar is provided with a mounting support, the connecting arm comprises two clamping plates, the mounting support comprises a vertical plate and a bottom plate arranged on two sides of the vertical plate, the vertical plate is positioned between the two clamping plates, the vertical plate is connected with a first connecting shaft, the first connecting shaft abuts against the upper ends of the two clamping plates, and the lower ends of the clamping plates abut against the bottom plate.
In an embodiment of the present invention, the connecting middle seat is hinged to the large piston rod through a second connecting shaft, the second connecting shaft is radially connected to one end of the large piston rod, the elastic pressing plate is connected to the large piston rod through a connecting piece, and the connecting piece is axially connected to one end of the large piston rod.
In one embodiment of the invention, the large oil cylinder body is also connected with a gland which is positioned at one side close to the other end of the large piston rod; the other end of the small oil cylinder body is also connected with an end cover.
In an embodiment of the present invention, a driving cavity and a collision block slidably connected in the driving cavity are disposed in the small oil cylinder, the collision block is sleeved on the small piston rod, a boss is circumferentially disposed on a surface of the small piston rod, an oil inlet and an oil return port are disposed at a side end of the small oil cylinder, the small piston rod of the oil return port can be driven to move by injecting hydraulic oil, and the collision block can contact with the boss to drive the small piston rod to move.
In one embodiment of the present invention, the gas ports include a rear gas port for detecting a disengagement state between the large piston rod and the small piston rod when they are separated, a middle gas port, and a front gas port; the middle air port is used for detecting a pre-tightening state, and the pre-tightening state is a state that the small piston rod is in contact with the large piston rod; the front air port is used for detecting an air compression state, and the air compression state is a state when no workpiece is arranged below the pressure head.
In one embodiment of the invention, in the pre-tightening state, one end of the small piston rod is in wedge fit with the side end of the large piston rod.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the hydraulic clamp locking mechanism for maintaining the clamping force is compact in structure, the large oil cylinder and the small oil cylinder are arranged, so that a large piston rod and a small piston rod which are separated are formed, sufficient axial locking force is ensured through wedge matching, self locking can be realized, and even if the oil pressure is reduced due to power failure, sufficient pressing force of a pressing end can be maintained for a long time; and can prevent the seizure phenomenon of the contact part of the wedge when resetting; the position of the small piston rod can be judged through the air detection seat, and misoperation can be effectively prevented.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic diagram of the hydraulic clamp locking mechanism of the present invention for maintaining a clamping force.
Fig. 2 is a top view of fig. 1.
Fig. 3 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 2.
Fig. 4 is a sectional view B-B of fig. 2.
Description reference numbers indicate: 1. mounting a bottom plate; 2. a sliding sleeve; 3. a first screw; 4. a large cylinder block; 5. a small oil cylinder body; 6. a second screw; 7. a gas detection seat; 8. a rear air port; 9. a middle gas port; 10. a front air port; 11. an oil inlet; 12. an oil return port; 13. a third screw; 14. a pressure head; 15. a slide bar; 16. an oilless bushing; 17. a first connecting shaft; 18. connecting the pressing plate; 19. a fourth screw; 20. an elastic pressing plate; 21. a second connecting shaft; 22. a large piston rod; 23. a fifth screw; 24. a gland; 25. a small piston rod; 26. an end cap; 27. a sixth screw; 28. a seventh screw; 29. a detection block; 30. eighthly, screwing; 31. bumping the block; 32. a limit screw; 33. and a ninth screw.
Detailed Description
The present invention is further described below in conjunction with the drawings and the embodiments so that those skilled in the art can better understand the present invention and can carry out the present invention, but the embodiments are not to be construed as limiting the present invention.
Referring to fig. 1 to 4, the hydraulic clamp locking mechanism for maintaining clamping force of the present invention comprises a mounting base plate 1, wherein the mounting base plate 1 is used for connecting a hydraulic clamp required to maintain clamping force, and further comprises: a slide bar 15, a large oil cylinder body 4 and a small oil cylinder body 5; the large oil cylinder body 4 is larger than the small oil cylinder body 5 in size;
the sliding rod 15 is connected to the mounting base plate 1 in a sliding mode, and one end of the sliding rod 15 is connected with a pressure head 14;
the large oil cylinder body 4 is connected to the mounting base plate 1, a large piston rod 22 is arranged in the large oil cylinder body 4, and the sliding rod 15 can be driven to slide along the mounting base plate 1 through the movement of the large piston rod 22;
5 one end of little hydro-cylinder body is connected in 4 sides of big hydro-cylinder body, the 5 other ends of little hydro-cylinder body are connected with gas and examine seat 7, be equipped with little piston rod 25 in the little hydro-cylinder body 5, little piston rod 25 is mutually perpendicular with big piston rod 22, little piston rod 25 one end can with the big piston rod 22 side contact with the big piston rod 22's of restriction removal, the little piston rod 25 other end is connected with detects piece 29, detect piece 29 sliding connection in gas and examine seat 7, gas is examined seat 7 and is equipped with and is used for detecting the gas port that detects piece 29 position in gas detection seat (7).
Specifically, still include sliding sleeve 2 and oilless bush 16, sliding sleeve 2 connects in mounting plate 1, slide bar 15 passes through oilless bush 16 sliding connection in sliding sleeve 2. The sliding rod 15 is matched with the oilless bush 16 to reduce the friction force when the sliding rod 15 slides, and the sliding rod 15 is in clearance fit with the sliding sleeve 2 through the oilless bush 16 to realize the linear motion of the pressure head 14 and keep the rigidity enough in the axial direction.
Specifically, the number of the slide bars 15 is two, and the two slide bars 15 are symmetrically arranged on two sides of the large oil cylinder body 4.
Specifically, still including connecting clamp plate 18 and elastic pressing plate 20, connecting clamp plate 18 is including connecting the linking arm at seat and symmetric connection seat both ends in connecting, and the other end of slide bar 15 is connected respectively to two linking arms, elastic pressing plate 20 with connect the seat all connect in big piston rod 22 one end, connecting clamp plate 18 still is equipped with the mounting groove, elastic pressing plate 20's bottom with the lower surface of mounting groove offsets.
Specifically, the other end of slide bar 15 is equipped with the erection support, the linking arm includes two cardboards, the erection support includes the riser and locates the bottom plate of riser both sides, the riser is located between two cardboards, the riser is connected with first connecting axle 17, first connecting axle 17 offsets with two respective upper ends of cardboard, and the lower extreme and the bottom plate of cardboard offset.
Specifically, the connecting middle seat is hinged to the large piston rod 22 through a second connecting shaft 21, so that size deviation of pressure points of the left pressure head 14 and the right pressure head 14 is eliminated, uniform distribution of pressing force is guaranteed, the second connecting shaft 21 is radially connected to one end of the large piston rod 22, the elastic pressure plate 20 is connected to the large piston rod 22 through a connecting piece, the connecting piece is axially connected to one end of the large piston rod 22, and the connecting piece can be a screw or the like. The large piston rod 22 drives the connecting pressure plate 18 to move downwards through the first connecting shaft 17, and the elastic pressure plate 20 can keep the connecting pressure plate 18 moving vertically downwards
Specifically, the large oil cylinder body 4 is also connected with a gland 24, and the gland 24 is positioned at one side close to the other end of the large piston rod 22; the other end of the small oil cylinder body 5 is also connected with an end cover 26.
Specifically, be equipped with drive chamber and sliding connection in the little oil cylinder body 5 and hit piece 31 in the drive intracavity, hit piece 31 cover and locate little piston rod 25, little piston rod 25 surface hoop is equipped with the boss, little oil cylinder body 5 side is equipped with oil inlet 11 and oil return opening 12, oil return opening 12 little piston rod 25 can hit piece 31 removal through the drive of injected hydraulic oil, it can move in order to drive little piston rod 25 with the boss contact to hit piece 31.
Specifically, the air ports include a rear air port 8, a middle air port 9 and a front air port 10, the rear air port 8 is used for detecting a disengagement state, and the disengagement state is a state when the large piston rod 22 and the small piston rod 25 are separated; the middle air port 9 is used for detecting a pre-tightening state, wherein the pre-tightening state is a state that the small piston rod 25 is in contact with the large piston rod 22; the front air port 10 is used for detecting an air pressure state, which is a state when no workpiece is located below the pressure head 14.
Specifically, in a pre-tightening state, one end of the small piston rod 25 is in wedge fit with the side end of the large piston rod 22, and the self-locking angle of the wedge fit is 15 degrees, so that the force increasing effect of the large piston rod 22 is ensured, the axial self-locking of the large piston rod 22 can be realized to realize the pressing force of the two pressing heads 14, and the low-power consumption, low fluctuation and high-efficiency pressing effects are realized.
In the embodiment, the mounting base plate 1 is mounted on a required hydraulic clamp through a screw nine 33; the sliding sleeve 2 is arranged on the mounting base plate 1 through a first screw 3; the elastic pressure plate 20 is arranged on the large piston rod 22 through a screw IV 19; the large oil cylinder body 4 is installed on the installation bottom plate 1 through a third screw 13, the large gland 24 is installed on the large oil cylinder body 4 through a fifth screw 23, the small oil cylinder body 5 is installed on the large oil cylinder body 4 through a second screw 6, and the limiting screw 32 is installed on the large oil cylinder body 4 and used for limiting the movement of the small piston rod 25; the gas detection seat 7 is arranged on the small oil cylinder body 5 through eight screws 30; the end cover 26 is arranged on the air detection seat 7 through a six-screw 27; the detection block 29 is mounted on the small piston rod 25 by means of a screw seven 28.
When the hydraulic oil recovery device works, hydraulic oil injected from the oil return port 12 can drive the collision block 31 to move upwards, the collision block 31 can drive the small piston rod 25 to move upwards to the rear position at the same time, the rear air port 8 detects a position signal of the small piston rod 25 (through special equipment which is provided by the existing numerical control machine and used for detecting air pressure or air flow), meanwhile, the large piston rod 22 and the small piston rod 25 are in a disengagement state, and at the moment, hydraulic oil is allowed to enter the upper part of the large oil cylinder body 4 through a hydraulic system, and the large piston rod 22 is driven to move downwards through the oil pressure; the large piston rod 22 drives the connecting pressure plate 18 to move downwards through the first connecting shaft 17, and the elastic pressure plate 20 can keep the connecting pressure plate 18 to move downwards horizontally; the connecting pressure plate 18 drives the sliding rod 15 to move downwards, and after the pressure head 14 arranged on the sliding rod 15 is contacted and pressed with a workpiece, the large piston rod 22 is in a balance position; at the moment, the hydraulic system injects hydraulic oil into the oil inlet 11, the oil pressure drives the small piston rod 25 to move downwards to the position where the inclined wedge surfaces are attached, and the small piston rod has proper pretightening force, and the pretightening force can be adjusted through the thicknesses of the pressure head 14 and the collision block 31; at this time, the small piston rod 25 drives the detection block 29 to move downwards to the middle position, and the middle air port 9 detects a position signal, so that a compaction confirmation signal can be sent to a numerical control system of the machine tool.
When no workpiece exists, the large piston rod 22 moves to the bottom to be contacted with the gland 24 and stops, the small piston rod 25 also moves downwards to the bottom to be contacted with the collision block 31 and stops, the small piston rod 25 drives the detection block 29 to move downwards to the lowest position, and the front air port 10 detects a position signal and informs a numerical control system of the machine tool that the pressure head 14 is in an air pressure state at the moment.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A clamp force retaining hydraulically operated tool locking mechanism comprising a mounting base plate (1), said mounting base plate (1) adapted to be connected to a hydraulically operated tool requiring clamp force retention, characterized by: a slide bar (15), a large oil cylinder body (4) and a small oil cylinder body (5);
the sliding rod (15) is connected to the mounting base plate (1) in a sliding mode, and one end of the sliding rod (15) is connected with a pressure head (14);
the large oil cylinder body (4) is connected to the mounting base plate (1), a large piston rod (22) is arranged in the large oil cylinder body (4), and the sliding rod (15) can be driven to slide along the mounting base plate (1) through the movement of the large piston rod (22);
one end of the small oil cylinder body (5) is connected to the side end of the large oil cylinder body (4), the other end of the small oil cylinder body (5) is connected with an air detection seat (7), a small piston rod (25) is arranged in the small oil cylinder body (5), the small piston rod (25) is perpendicular to the large piston rod (22), one end of the small piston rod (25) can be in contact with the side end of the large piston rod (22) to limit the movement of the large piston rod (22), the other end of the small piston rod (25) is connected with a detection block (29), the detection block (29) is connected into the air detection seat (7) in a sliding mode, and the air detection seat (7) is provided with an air port for detecting the position of the detection block (29) in the air detection seat (7);
a driving cavity and a collision block (31) which is connected in the driving cavity in a sliding mode are arranged in the small oil cylinder body (5), the collision block (31) is sleeved on the small piston rod (25), a boss is annularly arranged on the surface of the small piston rod (25), an oil inlet (11) and an oil return opening (12) are formed in the side end of the small oil cylinder body (5), the small piston rod (25) of the oil return opening (12) can drive the collision block (31) to move through injection of hydraulic oil, and the collision block (31) can be in contact with the boss to drive the small piston rod (25) to move;
the air ports comprise a rear air port (8), a middle air port (9) and a front air port (10), the rear air port (8) is used for detecting a disengagement state, and the disengagement state is a state when the large piston rod (22) and the small piston rod (25) are separated; the middle air port (9) is used for detecting a pre-tightening state, and the pre-tightening state is a state that the small piston rod (25) is in contact with the large piston rod (22); the front air port (10) is used for detecting an air pressure state, and the air pressure state is a state when no workpiece is arranged below the pressure head (14).
2. A clamp force maintaining hydraulic clamp locking mechanism as claimed in claim 1, further comprising a sliding sleeve (2) and an oilless bushing (16), said sliding sleeve (2) being connected to the mounting base plate (1), said sliding rod (15) being slidably connected to the sliding sleeve (2) through the oilless bushing (16).
3. A hydraulic clamp locking mechanism for maintaining a clamping force according to claim 1, wherein the number of the slide rods (15) is two, and the two slide rods (15) are symmetrically arranged on both sides of the large oil cylinder body (4).
4. A hydraulic clamp locking mechanism for maintaining a clamping force according to claim 3, further comprising a connecting pressure plate (18) and an elastic pressure plate (20), wherein the connecting pressure plate (18) comprises a middle connecting seat and connecting arms symmetrically connected to two ends of the middle connecting seat, the two connecting arms are respectively connected to the other ends of the sliding rods (15), the elastic pressure plate (20) and the middle connecting seat are both connected to one end of the large piston rod (22), the connecting pressure plate (18) is further provided with a mounting groove, and the bottom end of the elastic pressure plate (20) abuts against the lower surface of the mounting groove.
5. A hydraulic clamp locking mechanism for maintaining a clamping force according to claim 4, wherein the other end of the slide rod (15) is provided with a mounting support, the connecting arm comprises two clamping plates, the mounting support comprises a vertical plate and a bottom plate arranged on both sides of the vertical plate, the vertical plate is arranged between the two clamping plates, the vertical plate is connected with a first connecting shaft (17), the first connecting shaft (17) abuts against the respective upper ends of the two clamping plates, and the lower end of the clamping plate abuts against the bottom plate.
6. A hydraulic clamp locking mechanism for maintaining clamping force according to claim 4, characterized in that said connecting middle seat is hinged to said large piston rod (22) by a second connecting shaft (21), said second connecting shaft (21) being radially connected to one end of said large piston rod (22), said elastic pressure plate (20) being connected to said large piston rod (22) by a connecting member, said connecting member being axially connected to one end of said large piston rod (22).
7. A hydraulic clamp locking mechanism for maintaining clamping force according to claim 1, characterized in that a gland (24) is further connected to the large cylinder block (4), the gland (24) being located at a side close to the other end of the large piston rod (22); the other end of the small oil cylinder body (5) is also connected with an end cover (26).
8. A hydraulic clamp locking mechanism for maintaining a clamping force according to claim 1, wherein the small piston rod (25) is tapered at one end to engage the large piston rod (22) side end in the pre-tensioned state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210539776.5A CN114749949B (en) | 2022-05-18 | 2022-05-18 | Hydraulic clamp locking mechanism capable of keeping clamping force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210539776.5A CN114749949B (en) | 2022-05-18 | 2022-05-18 | Hydraulic clamp locking mechanism capable of keeping clamping force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114749949A CN114749949A (en) | 2022-07-15 |
| CN114749949B true CN114749949B (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210539776.5A Active CN114749949B (en) | 2022-05-18 | 2022-05-18 | Hydraulic clamp locking mechanism capable of keeping clamping force |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2937733A (en) * | 1956-10-31 | 1960-05-24 | Danly Mach Specialties Inc | Overload relief assembly for power presses |
| CN201970105U (en) * | 2011-04-01 | 2011-09-14 | 上海三一精机有限公司 | Oil cylinder clamping mechanism |
| CN103394944A (en) * | 2013-07-30 | 2013-11-20 | 江苏新贝斯特中传科技有限公司 | Self-locking oil cylinder |
| CN212420504U (en) * | 2020-06-15 | 2021-01-29 | 南京颖元科技有限公司 | Quick clamp for machine tool |
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2022
- 2022-05-18 CN CN202210539776.5A patent/CN114749949B/en active Active
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