CN107654721B - Switching tool for high-pressure gas cylinder valve - Google Patents
Switching tool for high-pressure gas cylinder valve Download PDFInfo
- Publication number
- CN107654721B CN107654721B CN201710752613.4A CN201710752613A CN107654721B CN 107654721 B CN107654721 B CN 107654721B CN 201710752613 A CN201710752613 A CN 201710752613A CN 107654721 B CN107654721 B CN 107654721B
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- cylinder valve
- supporting arm
- rack
- pressure gas
- gas cylinder
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- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 10
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a switching tool for a high-pressure gas cylinder valve, and relates to the technical field of special mechanical tools in the power industry. The switching tool for the high-pressure gas cylinder valve comprises a V-shaped frame, a hand wheel, a threaded adjusting knob and a movable jaw with a rack, wherein a triangular buckle structure is formed by a first fixed jaw, a second fixed jaw and the movable jaw on the V-shaped frame, the buckle structure is matched with the high-pressure gas cylinder valve, and the high-pressure gas cylinder valve is opened or closed by rotating the hand wheel; the threaded adjusting knob is meshed with the movable jaw with the rack through threads and the rack, and the distance between the movable jaw with the rack and the first fixed jaw and the distance between the movable jaw with the rack and the second fixed jaw can be adjusted by rotating the threaded adjusting knob so as to adapt to high-pressure gas cylinder valves with different sizes, so that the application range is wider; the invention has simple structure, convenient carrying, low cost and strong practical value.
Description
Technical Field
The invention belongs to the technical field of special mechanical tools in the power industry, and particularly relates to a switching tool for a high-pressure gas cylinder valve.
Background
Currently, SF6 electrical equipment is increasingly applied in the power industry, and the main aspects are as follows: SF6 transformers, SF6 voltage transformers, SF6 current transformers, and the like. For such SF6 electrical equipment, provision is made in the electrical equipment overhaul test protocol: the equipment is tested before being put into operation, and the equipment is tested in one year after being put into operation, such as the equipment is tested in every three years without abnormality. When the equipment is tested, SF6 pure gas is needed to be used for checking the testing equipment, the SF6 pure gas is contained in a high-pressure gas cylinder, and the high-pressure gas cylinder plays a role in switching through a valve with the diameter of 4 cm. Meanwhile, the tester applies N2 and standard gas when doing chromatographic test on transformer oil. Wherein, N2 and standard gas are contained by similar high-pressure gas cylinders, and valves are also similar. Normally, N2 used for checking an instrument and N2 used for performing a chromatographic test require absolute purity of gas, otherwise, abnormal test data can be caused, and the health condition of equipment can not be judged; and the purity degree of standard gas used for transformer oil chromatographic test is higher. Therefore, when using such high pressure gas cylinders, test or maintenance personnel can use up the gas cylinders, which results in more effort to unscrew the gas cylinders when they are used next time. In addition, the high-pressure gas cylinder is also provided with a handle which is convenient to lift, and the difficulty of unscrewing and screwing the valve is increased. At present, the requirements on the power supply reliability are higher and higher, the preventive test frequency of primary equipment is continuously increased, the pre-test frequency of SF6 equipment and the chromatographic test frequency of transformer oil are also increased, and the design of a portable and labor-saving switching tool of a high-pressure gas cylinder valve is particularly important.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a switching tool for a high-pressure gas cylinder valve.
The invention solves the technical problems by the following technical scheme: a switch tool for a high-pressure gas cylinder valve comprises a V-shaped frame, a hand wheel, a threaded adjusting knob and a movable jaw with a rack; the V-shaped frame comprises a support arm and a fixed jaw, wherein the support arm comprises a first support arm and a second support arm, one ends of the first support arm and the second support arm are fixedly connected, and the other ends of the first support arm and the second support arm form a V-shaped opening; the fixed jaw comprises a first fixed jaw and a second fixed jaw, the first fixed jaw is vertically and downwards fixed at the other end of the first support arm, and the second fixed jaw is vertically and downwards fixed at the other end of the second support arm;
the threaded adjusting knob is pivoted at the bottom of the V-shaped frame supporting arm and can rotate freely; the movable jaw with the rack comprises a movable jaw and a third supporting arm, the movable jaw is vertically and downwards fixedly arranged at one end of the third supporting arm, and the rack is arranged on the third supporting arm at one side far away from the movable jaw; the other end of the third supporting arm is in sliding connection with the supporting arm of the V-shaped frame through a linear guide mechanism, and a rack on the third supporting arm is meshed with threads on a threaded adjusting knob;
the hand wheel comprises a hand wheel body and a valve rod, wherein the hand wheel body comprises a hand wheel inner ring, a hand wheel outer ring arranged on the outer side of the hand wheel inner ring, and spokes connecting the hand wheel outer ring and the hand wheel inner ring, and a plurality of grooves are arranged on the upper edge of the outer side of the hand wheel outer ring; a wheel core is arranged below the inner ring of the hand wheel, one end of the valve rod is fixedly connected with the wheel core, and the other end of the valve rod is fixed on a supporting arm of the V-shaped frame;
when the threaded adjusting knob is rotated, due to the meshing structure of the threads and the racks, the movable jaw with the racks slides along the linear guide mechanism under the drive of the threaded adjusting knob, so that the distance between the movable jaw and the fixed jaw is adjusted to adapt to the cylinder valve sizes of high-pressure gas cylinders with different specifications; after the distance between the movable jaw and the fixed jaw is adjusted, the cylinder valve of the high-pressure gas cylinder is opened or closed by rotating the hand wheel, so that the difficulty in opening and closing the cylinder valve of the high-pressure gas cylinder is reduced.
Further, the linear guide mechanism comprises a supporting rod, a sliding block and a sliding groove; one end of the supporting rod is fixed on a supporting arm of the V-shaped frame, the other end of the supporting rod is fixedly connected with the sliding block, the sliding groove is formed in a third supporting arm on the same side with the rack, the sliding block slides in the sliding groove, and the rack can be meshed with the threads; the movable jaw with the rack can slide relative to the V-shaped frame under the drive of the threaded adjusting knob through the linear guide mechanism, and the movable jaw with the rack can be supported; the movable jaw, the first fixed jaw and the second fixed jaw form a triangular buckle structure, and the buckle structure is matched with the cylinder valve of the high-pressure gas cylinder and can stably clamp the concave part of the cylinder valve so as to save labor and rapidly open or close the cylinder valve of the high-pressure gas cylinder.
Further, one end of the supporting rod is fixed on a third supporting arm on the same side as the rack, the other end of the supporting rod is fixedly connected with the sliding block, the sliding groove is formed in the supporting arm of the V-shaped frame, the sliding block slides in the sliding groove, and the rack can be meshed with the threads.
Further, the threaded adjusting knob is sleeved on the pin shaft, two ends of the pin shaft are fixedly arranged at the bottom of the V-shaped frame supporting arm through two supporting columns, and the threaded adjusting knob can freely rotate around the pin shaft.
Further, the V-shaped frame is of an integrated structure.
Further, the inner side surfaces of the fixed jaw and the movable jaw are arc-shaped respectively and are matched with the edge of the cylinder valve of the high-pressure gas cylinder so as to be better attached to the edge of the cylinder valve of the high-pressure gas cylinder, the friction force between the fixed jaw and the movable jaw is increased, the stress area is increased, and the difficulty of opening and closing the cylinder valve is reduced.
Further, the included angle between the first supporting arm and the second supporting arm is an acute angle, and the lengths of the first supporting arm and the second supporting arm are equal; the preferred angle is 36, and the isosceles triangle buckle structure that the angle is 36 can more firm card the cylinder valve of high-pressure gas cylinder.
Further, a rubber layer is arranged at the lower part of the outer side of the hand wheel outer ring; the middle parts of the upper ends of the outer ring of the hand wheel, the spoke and the inner ring of the hand wheel are respectively provided with an upward convex reinforcing rib.
Further, the diameter of the outer ring of the hand wheel is preferably 8cm.
Compared with the prior art, the opening and closing tool for the high-pressure gas cylinder valve comprises the V-shaped frame, the hand wheel, the threaded adjusting knob and the movable jaw with the rack, wherein a triangular buckle structure is formed by the first fixed jaw, the second fixed jaw and the movable jaw on the V-shaped frame, the buckle structure is matched with the high-pressure gas cylinder valve, and the high-pressure gas cylinder valve is opened or closed by rotating the hand wheel; the threaded adjusting knob is meshed with the movable jaw with the rack through threads and the rack, and the distance between the movable jaw with the rack and the first fixed jaw and the distance between the movable jaw with the rack and the second fixed jaw can be adjusted by rotating the threaded adjusting knob so as to adapt to high-pressure gas cylinder valves with different sizes, so that the application range is wider; the invention has simple structure, convenient carrying, low cost and strong practical value.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawing in the description below is only one embodiment of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a switching tool for a high-pressure cylinder valve according to the present invention;
FIG. 2 is a schematic view of the structure of the hand wheel body of the present invention;
FIG. 3 is a cross-sectional view of the handwheel body of the invention;
fig. 4 is a diagram of the use of the switching tool of the present invention for a high pressure cylinder valve;
wherein: the novel high-pressure cylinder valve comprises a first supporting arm, a second supporting arm, a first fixed jaw, a second fixed jaw, a 5-threaded adjusting knob, a 6-pin shaft, a 7-supporting column, an 8-movable jaw, a 9-third supporting arm, a 10-rack, an 11-hand wheel outer ring, a 12-spoke, a 13-valve rod, a 14-hand wheel inner ring, a 15-supporting rod, a 16-sliding block, a 17-high-pressure cylinder valve, an 18-reinforcing rib, a 19-groove and a 20-wheel core.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully by reference to the accompanying drawings, in which it is shown, however, only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, the switching tool for the high-pressure gas cylinder valve 17 provided by the invention comprises a V-shaped frame, a hand wheel, a threaded adjusting knob 5 and a movable jaw 8 with a rack 10; the V-shaped frame comprises a support arm and a fixed jaw, the support arm comprises a first support arm 1 and a second support arm 2, one ends of the first support arm 1 and the second support arm 2 are fixedly connected, and the other ends form a V-shaped opening; the fixed jaw comprises a first fixed jaw 3 and a second fixed jaw 4, wherein the first fixed jaw 3 is vertically and downwards fixed at the other end of the first support arm 1, and the second fixed jaw 4 is vertically and downwards fixed at the other end of the second support arm 2;
the threaded adjusting knob 5 is pivoted at the bottom of the V-shaped frame supporting arm and can rotate freely; the movable jaw 8 with the rack 10 comprises a movable jaw 8 and a third supporting arm 9, the movable jaw 8 is vertically and downwards fixedly arranged at one end of the third supporting arm 9, and the rack 10 is arranged on the third supporting arm 9 at one side far away from the movable jaw 8; the other end of the third supporting arm 9 is in sliding connection with the supporting arm of the V-shaped frame through a linear guide mechanism, and a rack 10 on the third supporting arm 9 is meshed with threads on the threaded adjusting knob 5;
the hand wheel comprises a hand wheel body and a valve rod 13, wherein the hand wheel body comprises a hand wheel inner ring 14, a hand wheel outer ring 11 arranged on the outer side of the hand wheel inner ring 14, and spokes 12 connecting the hand wheel outer ring 11 and the hand wheel inner ring 14, and a plurality of grooves 19 are distributed on the upper edge of the outer side of the hand wheel outer ring 11; a wheel core 20 is arranged below the inner ring 14 of the hand wheel, one end of the valve rod 13 is fixedly connected with the wheel core 20, and the other end of the valve rod 13 is fixed on a supporting arm of the V-shaped frame.
When the high-pressure gas cylinder valve locking device is used, the first fixed jaw 3, the second fixed jaw 4 and the movable jaw 8 form a triangular clamping structure, the clamping structure clamps the high-pressure gas cylinder valve, and the high-pressure gas cylinder valve 17 is opened or closed by rotating the hand wheel.
The linear guide mechanism comprises a supporting rod 15, a sliding block 16 and a sliding groove; one end of the supporting rod 15 is fixed on a supporting arm of the V-shaped frame, the other end of the supporting rod is fixedly connected with the sliding block 16, the sliding groove is formed in the third supporting arm 9 on the same side with the rack 10, the sliding block 16 slides in the sliding groove, and the rack 10 can be meshed with threads; the movable jaw 8 with the rack 10 can slide relative to the V-shaped frame under the drive of the threaded adjusting knob 5 through the linear guide mechanism, and the movable jaw 8 with the rack 10 can be supported; the movable jaw 8, the first fixed jaw 3 and the second fixed jaw 4 form a triangular fastening structure, and the fastening structure is matched with the cylinder valve 17 of the high-pressure gas cylinder, so that the concave part of the cylinder valve 17 can be stably clamped, and the cylinder valve 17 of the high-pressure gas cylinder can be opened or closed quickly in a labor-saving manner.
One end of the supporting rod 15 is fixed on the third supporting arm 9 on the same side as the rack 10, the other end is fixedly connected with the sliding block 16, the sliding groove is formed in the supporting arm of the V-shaped frame, the sliding block 16 slides in the sliding groove, and the rack 10 can be meshed with threads.
The threaded adjusting knob 5 is sleeved on the pin shaft 6, two ends of the pin shaft 6 are fixedly arranged at the bottom of the V-shaped frame supporting arm through two supporting columns 7, and the threaded adjusting knob 5 can freely rotate around the pin shaft 6.
The inner side surfaces of the fixed jaw and the movable jaw 8 are respectively arc-shaped and are matched with the edge of the cylinder valve 17 of the high-pressure gas cylinder so as to be better attached to the edge of the cylinder valve 17 of the high-pressure gas cylinder, the friction force between the fixed jaw and the movable jaw is increased, the stress area is increased, and the difficulty of opening and closing the cylinder valve 17 is reduced.
The included angle alpha between the first support arm 1 and the second support arm 2 is an acute angle, and the lengths of the first support arm 1 and the second support arm 2 are equal; the included angle alpha is preferably 36 degrees, and the isosceles triangle fastening structure with the included angle alpha of 36 degrees can more firmly fasten the cylinder valve 17 of the high-pressure gas cylinder.
As shown in fig. 3, a rubber layer is arranged at the lower part of the outer side of the hand wheel outer ring 11; the middle parts of the upper ends of the outer ring 11, the spoke 12 and the inner ring 14 of the hand wheel are respectively provided with an upward convex reinforcing rib 18; the hand wheel body provided with the grooves 19 and the rubber layers is characterized in that when the hand wheel body rotates, the hand wheel outer ring 11 is held by the palm, so that the friction force between the palm and the hand wheel outer ring 11 is increased, slipping is not easy, and the force is better; the hand wheel body provided with the reinforcing ribs 18 is not easy to bend.
The diameter of the handwheel outer race 11 is preferably 8cm.
As shown in fig. 4, when in use, the first fixed jaw 3, the second fixed jaw 4 and the movable jaw 8 are clamped in the concave part of the high-pressure gas cylinder valve 17, the threaded adjusting knob 5 is rotated, the movable jaw 8 with the rack 10 slides along the linear guide mechanism under the driving of the threaded adjusting knob 5 due to the meshing action of the threads and the rack 10, the threaded adjusting knob 5 is rotated upwards, the movable jaw 8 extends outwards, the threaded adjusting knob 5 is rotated downwards, the movable jaw 8 is retracted inwards, and the distance between the movable jaw 8 and the fixed jaw is adjusted, so that the bottle valve 17 of high-pressure gas cylinders with different specifications is adapted to the size of the high-pressure gas cylinder valve 17; after the distance between the movable jaw 8 and the fixed jaw is adjusted, the cylinder valve 17 of the high-pressure gas cylinder is opened or closed by rotating the hand wheel, so that the difficulty in opening and closing the cylinder valve 17 of the high-pressure gas cylinder is reduced.
Examples:
the specific structural dimensions of the switching tool in the invention are designed by taking the diameter of the high-pressure gas cylinder valve 17 as an example of 4.5cm, the length of the first supporting arm 1 and the length of the second supporting arm 2 are 5cm, the included angle alpha is preferably 30-60 degrees, and in the embodiment, the included angle alpha=36 degrees; the length of the first fixed jaw 3 and the second fixed jaw 4 is 3cm, the distance from the other end of the third supporting arm 9 to the movable jaw 8 is 4cm, the length of the movable jaw 8 is 1.5cm, and the diameter of the outer ring 11 of the hand wheel is 8cm.
The foregoing disclosure is merely illustrative of specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will readily recognize that changes and modifications are possible within the scope of the present invention.
Claims (9)
1. A switching tool for a high pressure gas cylinder valve, characterized in that: comprises a V-shaped frame, a hand wheel, a threaded adjusting knob (5) and a movable jaw (8) with a rack (10); the V-shaped frame comprises a support arm and a fixed jaw, wherein the support arm comprises a first support arm (1) and a second support arm (2), one ends of the first support arm (1) and the second support arm (2) are fixedly connected, and the other ends of the first support arm and the second support arm form a V-shaped opening; the fixed jaw comprises a first fixed jaw (3) and a second fixed jaw (4), wherein the first fixed jaw (3) is vertically downwards fixed at the other end of the first support arm (1), and the second fixed jaw (4) is vertically downwards fixed at the other end of the second support arm (2);
the threaded adjusting knob (5) is pivoted at the bottom of the V-shaped frame supporting arm and can rotate freely; the movable jaw (8) with the rack (10) comprises a movable jaw (8) and a third supporting arm (9), wherein the movable jaw (8) is vertically and downwards fixedly arranged at one end of the third supporting arm (9), and the rack (10) is arranged on the third supporting arm (9) at one side far away from the movable jaw (8); the other end of the third supporting arm (9) is in sliding connection with a supporting arm of the V-shaped frame through a linear guide mechanism, and a rack (10) on the third supporting arm (9) is meshed with threads on the threaded adjusting knob (5);
when the high-pressure gas cylinder valve is used, the first fixed jaw (3), the second fixed jaw (4) and the movable jaw (8) form a triangular clamping structure, the clamping structure clamps the high-pressure gas cylinder valve, and the high-pressure gas cylinder valve (17) is opened or closed by rotating the hand wheel;
the linear guide mechanism comprises a supporting rod (15), a sliding block (16) and a sliding groove; one end of the supporting rod (15) is fixed on a supporting arm of the V-shaped frame, the other end of the supporting rod is fixedly connected with the sliding block (16), the sliding groove is formed in a third supporting arm (9) on the same side with the rack (10), the sliding block (16) slides in the sliding groove, and the rack (10) can be meshed with threads.
2. The switching tool for a high pressure cylinder valve as claimed in claim 1, wherein: one end of the supporting rod (15) is fixed on a third supporting arm (9) on the same side as the rack (10), the other end of the supporting rod is fixedly connected with the sliding block (16), the sliding groove is formed in the supporting arm of the V-shaped frame, the sliding block (16) slides in the sliding groove, and the rack (10) can be meshed with threads.
3. The switching tool for a high pressure cylinder valve as claimed in claim 1, wherein: the threaded adjusting knob (5) is sleeved on the pin shaft (6), and two ends of the pin shaft (6) are fixedly arranged at the bottom of the V-shaped frame supporting arm through two supporting columns (7).
4. The switching tool for a high pressure cylinder valve as claimed in claim 1, wherein: the V-shaped frame is of an integrated structure.
5. The switching tool for a high pressure cylinder valve as claimed in claim 1, wherein: the inner side surfaces of the fixed jaw and the movable jaw (8) are respectively arc-shaped and are adapted to the edges of the cylinder valve of the high-pressure gas cylinder.
6. The switching tool for a high pressure cylinder valve as claimed in claim 1, wherein: the included angle between the first supporting arm (1) and the second supporting arm (2) is an acute angle, and the lengths of the first supporting arm (1) and the second supporting arm (2) are equal.
7. The switching tool for a high pressure cylinder valve as claimed in claim 1, wherein: the included angle between the first supporting arm (1) and the second supporting arm (2) is 36 degrees.
8. The switching tool for a high pressure cylinder valve as claimed in claim 1, wherein: a rubber layer is arranged at the lower part of the outer side of the hand wheel outer ring (11); the middle parts of the upper ends of the outer ring (11), the spoke (12) and the inner ring (14) of the hand wheel are respectively provided with an upward convex reinforcing rib (18).
9. A switching tool for a high pressure cylinder valve as claimed in claim 1 or 8, wherein: the diameter of the outer ring (11) of the hand wheel is 8cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710752613.4A CN107654721B (en) | 2017-08-28 | 2017-08-28 | Switching tool for high-pressure gas cylinder valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710752613.4A CN107654721B (en) | 2017-08-28 | 2017-08-28 | Switching tool for high-pressure gas cylinder valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107654721A CN107654721A (en) | 2018-02-02 |
| CN107654721B true CN107654721B (en) | 2024-03-22 |
Family
ID=61128899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710752613.4A Active CN107654721B (en) | 2017-08-28 | 2017-08-28 | Switching tool for high-pressure gas cylinder valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107654721B (en) |
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| JP5869095B1 (en) * | 2014-12-15 | 2016-02-24 | 中国電力株式会社 | Valve handle operation aid |
| CN205438345U (en) * | 2016-03-24 | 2016-08-10 | 台州正鼎建设有限公司 | Spanner for multi -use architecture |
| CN205654955U (en) * | 2016-05-05 | 2016-10-19 | 徐欢 | Multi function valve door hand wheel structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB207901A (en) * | 1922-09-13 | 1923-12-13 | Wenzel Dvorak | Improvements in pipe wrenches |
| US2599489A (en) * | 1951-09-29 | 1952-06-03 | Paul E Schmidt | Valve adjusting tool |
| FR1265374A (en) * | 1960-05-20 | 1961-06-30 | Savarin & Veuve Foinant | Improvement in adjustable wrenches for tubes |
| US4802389A (en) * | 1983-02-04 | 1989-02-07 | Shultz William E | Adjustable workpiece gripping and rotating device |
| JP2001022459A (en) * | 1999-07-02 | 2001-01-26 | Sanwa Seiki Co Ltd | Handle device of hand control valve |
| CN1575931A (en) * | 2003-07-23 | 2005-02-09 | 约翰·K·琼克斯 | A method of tightening and loosening an object |
| CN201168930Y (en) * | 2008-01-25 | 2008-12-24 | 纬泰机械(上海)有限公司 | Locking pliers and presser foot opening regulating mechanism thereof |
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| CN205765819U (en) * | 2015-11-26 | 2016-12-07 | 中国人民解放军军械工程学院 | Three-pawl type spanner clamping device |
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| CN205654955U (en) * | 2016-05-05 | 2016-10-19 | 徐欢 | Multi function valve door hand wheel structure |
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| Publication number | Publication date |
|---|---|
| CN107654721A (en) | 2018-02-02 |
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