Quick labor-saving device for opening and closing valve

Abstract

The invention relates to the technical field of gas transmission station overhaul, in particular to a quick labor-saving device for opening and closing a valve. The quick labor-saving device for opening and closing the valve comprises a pipeline positioning and clamping assembly, a valve hand wheel positioning and clamping assembly and a variable-speed rotation driving assembly, the valve hand wheel positioning and clamping assembly is used for being connected with a mechanical hand wheel of the valve in a clamping mode, and the variable-speed rotation driving assembly is connected with the valve hand wheel positioning and clamping assembly. The pipeline positioning and clamping assembly is used for driving the valve hand wheel positioning and clamping assembly to drive a mechanical hand wheel to rotate, the variable-speed rotation driving assembly is installed on the pipeline positioning and clamping assembly, and the pipeline positioning and clamping assembly is used for being connected with pipelines at the two ends of a valve in a clamping mode. The device has the advantages that the structural design is simple and reasonable, when the valve is opened and closed, the opening and closing time of the valve is greatly shortened by means of the device, meanwhile, labor is saved when the valve is opened and closed, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas transmission station maintenance, and in particular to a fast and labor-saving device for opening and closing valves. Background Art

[0002] The oil and gas transmission station has valves such as gas-liquid linkage valves, ball valves, plug valves, throttling stop valves, etc. Among them, the gas-liquid linkage valves and some ball valves have electric actuators, which can realize automatic opening and closing. However, most ball valves, plug valves, throttling stop valves do not have electric actuators and do not have automatic opening and closing functions. They need to be opened and closed manually with the help of hand wheels. However, manual opening and closing of valves has the following defects:

[0003] Manually opening and closing valves is time-consuming and labor-intensive, and the work efficiency is low.

[0004] Based on this, it is necessary to develop a fast and labor-saving device for switching valves externally to overcome the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a fast and labor-saving device for opening and closing valves, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A quick and labor-saving device for switching valves, comprising a pipeline positioning clamping assembly, a valve handwheel positioning clamping assembly and a variable speed rotary drive assembly, wherein the valve handwheel positioning clamping assembly is used for clamping and connecting with a mechanical handwheel of the valve, and the variable speed rotary drive assembly is connected with the valve handwheel positioning clamping assembly to drive the valve handwheel positioning clamping assembly to drive the mechanical handwheel to rotate, and the variable speed rotary drive assembly is mounted on the pipeline positioning clamping assembly, and the pipeline positioning clamping assembly is used for clamping and connecting with the pipelines at both ends of the valve.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the above-mentioned pipeline positioning and clamping assembly includes two vertical poles, a cross bar, two positioning connecting rods and two groups of pipeline clamps. The two above-mentioned vertical poles are vertically spaced apart, the above-mentioned cross bar is horizontally arranged, and its two ends are respectively vertically connected to the two above-mentioned vertical poles. The above-mentioned variable speed rotation drive assembly is installed on the above-mentioned cross bar. The two above-mentioned positioning connecting rods are respectively vertically assembled on the two above-mentioned vertical poles one by one, and the two are distributed in parallel and spaced apart, and are respectively perpendicular to the above-mentioned cross bar. The two groups of above-mentioned pipeline clamps are respectively installed at one end of the two above-mentioned positioning connecting rods, and the two groups of above-mentioned pipeline clamps are respectively used to clamp the pipelines at both ends of the valve.

[0010] Furthermore, two ends of the cross bar are connected to the two vertical bars via first cross fixing clamps, and the two positioning connecting rods are connected to the two vertical bars via second cross fixing clamps.

[0011] Furthermore, support bases are respectively provided at the lower ends of the two vertical poles.

[0012] Furthermore, the above-mentioned pipe clamp includes two arc-shaped pipe clamps, both ends of the two pipe clamps are respectively provided with connecting parts, the two pipe clamps are respectively attached to both sides of the pipe, the connecting parts at both ends of the two pipe clamps are respectively connected by bolts, and one end of the above-mentioned positioning connecting rod is connected to a corresponding one of the above-mentioned pipe clamps.

[0013] Furthermore, one end of the positioning connecting rod is provided with an external thread, and a sleeve with an internal thread is provided on the outer side of the arc top of the corresponding pipe clamp, and one end of the positioning connecting rod is screwed with the sleeve on the corresponding pipe clamp.

[0014] Furthermore, a mounting plate for assembling the variable speed rotary drive assembly is provided at the upper end of the crossbar.

[0015] Furthermore, the valve handwheel positioning clamping assembly includes a positioning rod, two handwheel clamps and a connecting shaft. The connecting shaft is vertically fixed on one side of the middle part of the positioning rod. The two handwheel clamps are respectively assembled on both ends of the positioning rod, and the spacing can be adjusted along the length direction of the positioning rod. The two handwheel clamps are respectively used to clamp the opposite sides of the mechanical handwheel. The variable speed rotation drive assembly is connected to the connecting shaft, and is used to drive the connecting shaft to drive the positioning rod to rotate.

[0016] Furthermore, the handwheel clamp includes a ring and a C-shaped claw, the two rings are respectively mounted on the two ends of the positioning rod, and the two are respectively threadedly connected with tightening bolts, the tightening bolts are used to be screwed until they are against or separated from the positioning rod, one end of the claw is connected and fixed to the ring, the other ends of the claws of the two handwheel clamps are close to each other, and a through slot is opened in the middle part of the other ends of the claws of the two handwheel clamps for embedding the supporting connecting rod inside the handwheel.

[0017] Furthermore, the above-mentioned speed-changing rotary drive assembly includes a speed-changing gear box and a crank, the output shaft of the above-mentioned speed-changing gear box is coaxially connected to the above-mentioned connecting shaft, and the above-mentioned crank is detachably connected to the output shaft of the above-mentioned speed-changing gear box.

[0018] The beneficial effects of the present invention are: the structural design is simple and reasonable, and when the valve is opened and closed, the device can greatly reduce the time of opening and closing the valve, and at the same time, it is more labor-saving when opening and closing, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a structural schematic diagram of the quick and labor-saving device for opening and closing a valve of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the cooperation between the pipeline clamp and the positioning rod in the quick and labor-saving device for opening and closing valves of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a valve hand wheel positioning clamping assembly in the quick and labor-saving device for switching valves of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the clamping claw in the quick and labor-saving device for switching valves of the present invention.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1. Pipe positioning clamping assembly; 2. Valve handwheel positioning clamping assembly; 3. Variable speed rotation drive assembly; 11. Vertical pole; 12. Cross bar; 13. Positioning connecting rod; 14. Pipe clamp; 21. Positioning rod; 22. Handwheel clamp; 23. Connecting shaft; 31. Variable speed gear box; 32. Crank; 111. Support base; 121. First cross fixing clamp; 122. Mounting plate; 131. Second cross fixing clamp; 141. Pipe clamp; 142. Bolt; 221. Ring; 222. Claw; 223. Tightening bolt; 1411. Connecting part; 1412. Sleeve. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] Example: Figure 1 As shown, the quick and labor-saving device for switching valves of this embodiment includes a pipeline positioning clamping assembly 1, a valve handwheel positioning clamping assembly 2 and a variable speed rotation drive assembly 3. The above-mentioned valve handwheel positioning clamping assembly 2 is used for clamping and connecting with the mechanical handwheel of the valve (denoted by D in the figure), and the above-mentioned variable speed rotation drive assembly 3 is connected with the above-mentioned valve handwheel positioning clamping assembly 2 to drive the above-mentioned valve handwheel positioning clamping assembly 2 to drive the mechanical handwheel to rotate. The above-mentioned variable speed rotation drive assembly 3 is installed on the above-mentioned pipeline positioning clamping assembly 1, and the above-mentioned pipeline positioning clamping assembly 1 is used for clamping and connecting with the pipelines at both ends of the valve.

[0027] In the quick and labor-saving device for switching valves of the present embodiment, the variable speed rotary drive component 3 is installed on the pipeline positioning clamping component 1 and assembled with the valve handwheel positioning clamping component 2. When in use, the valve handwheel positioning clamping component 2 is assembled with the mechanical handwheel of the valve, and then the pipeline positioning clamping component 1 is assembled with the pipelines connected to both ends of the valve. Next, the valve handwheel positioning clamping component 2 is driven to rotate by operating the variable speed rotary drive component 3, thereby driving the mechanical handwheel to rotate to realize the switching of the valve. Since the variable speed rotary drive component 3 can set the transmission ratio according to actual needs, the valve handwheel positioning clamping component 2 is driven by it to rotate at a speed higher than the rotation speed of the manually operated mechanical handwheel. The overall structural design is simple and reasonable. When the valve is opened and closed, with the help of this device, the time for opening and closing the valve is greatly reduced. At the same time, it is more labor-saving when opening and closing, and the work efficiency is improved.

[0028] As a preferred embodiment, the pipe positioning clamping assembly 1 comprises two vertical poles 11, a cross bar 12, two positioning connecting rods 13 and two groups of pipe clamps 14. The two vertical poles 11 are vertically spaced apart, the cross bar 12 is horizontally arranged, and its two ends are respectively vertically connected to the two vertical poles 11. The variable speed rotation drive assembly 3 is mounted on the cross bar 12. The two positioning connecting rods 13 are respectively and one by one vertically assembled on the two vertical poles 11, and the two are distributed in parallel and spaced apart, and are respectively perpendicular to the cross bar 12. The two groups of pipe clamps 14 are respectively mounted on one end of the two positioning connecting rods 13, and the two groups of pipe clamps 14 are respectively used to clamp the pipes at both ends of the valve.

[0029] In the above-mentioned implementation scheme, two vertical poles 11 are vertically supported on the ground, and then a cross bar 12 is installed between the two vertical poles 11, and then two positioning connecting rods 13 are installed on the two vertical poles 11. At the same time, two sets of pipe clamps 14 are fixed to the pipe clamps at both ends of the valve. The position of the two positioning connecting rods 13 in the long axis direction can be adjusted to achieve the adjustment of the valve handwheel positioning clamping assembly 2 close to or away from the valve, and the cross bar 12 can also move the adjustment position along its long axis direction, so as to adjust the displacement of the valve handwheel positioning clamping assembly 2 along the length direction of the cross bar 12. In this way, the valve handwheel positioning clamping assembly 2 can be adjusted to face the handwheel of the valve. After being connected with the handwheel, the valve handwheel positioning clamping assembly 2 can be driven by the variable speed rotation drive assembly 3 to drive the handwheel to rotate, so as to realize the switching of the valve. The pipe positioning clamping assembly 1 has a simple structural design and is relatively convenient to assemble.

[0030] As a preferred embodiment, both ends of the cross bar 12 are connected to the two vertical bars 11 via a first cross fixing clamp 121 , and the two positioning connecting rods 13 are connected to the two vertical bars 11 via a second cross fixing clamp 131 .

[0031] In the above embodiment, the height and length displacement of the cross bar 12 relative to the vertical bar 11 can be adjusted by adjusting the tightness of the connection between the first cross fixing clamp 121 and the cross bar 12 or the vertical bar 11. The height and length displacement of the positioning vertical bar 11 can also be adjusted by adjusting the tightness of the connection between the second cross fixing clamp 131 and the vertical bar 11 and the positioning connecting rod 13.

[0032] It should be noted that: the first cross fixing clamp 121 and the second cross fixing clamp 131 can both be optical axis cross fixing clamps currently available on the market, which are products of the prior art and will not be described in detail here.

[0033] In this embodiment, the lower ends of the two vertical poles 11 are respectively provided with support bases 111. The support bases 111 can make the vertical poles 11 or the lower end of the entire device stably supported on the ground.

[0034] As a preferred embodiment, Figure 2 As shown, the pipe clamp 14 includes two arc-shaped pipe clamps 141, both ends of the two pipe clamps 141 are respectively provided with connecting parts 1411, the two pipe clamps 141 are respectively attached to both sides of the pipe, the connecting parts 1411 at both ends of the two pipe clamps 141 are respectively connected by bolts 142, and one end of the positioning link 13 is connected to a corresponding one of the pipe clamps 141.

[0035] In the above implementation scheme, the two pipe clamps 141 are distributed on both sides of the pipeline in an embracing posture, and bolts 142 are passed through the connecting parts 1411 at the same end of the two pipe clamps 141 for threaded connection and fixation, and the connecting parts 1411 at the other ends are also connected by bolts 142, so that the pipe clamp 14 can stably clamp the pipeline, ensuring the stable assembly of the entire device on the pipeline.

[0036] As a preferred embodiment, one end of the positioning link 13 is provided with an external thread, and a sleeve 1412 with an internal thread is provided on the outer side of the arc top of the corresponding pipe clamp 141, and one end of the positioning link 13 is screwed into the sleeve 1412 on the corresponding pipe clamp 141.

[0037] In the above embodiment, the positioning link 13 and the pipe clamp 141 are connected by threaded connection, so the disassembly and assembly between the two is convenient and quick.

[0038] As a preferred embodiment, a mounting plate 122 for assembling the speed-changing rotary drive assembly 3 is provided at the upper end of the cross bar 12 .

[0039] In the above embodiment, the installation of the mounting plate 122 facilitates the stable assembly of the variable speed rotary drive assembly 3. Specifically, the mounting plate 122 has a large area, which is easy to stably assemble the variable speed rotary drive assembly 3. The two can be connected by screws, and the mounting plate 122 can be fixed to the cross bar 12 by welding. By adjusting the displacement in the length direction of the cross bar 12, the position of the variable speed rotary drive assembly 3 along the length direction of the cross bar 12 can be adjusted, so as to adapt the connection between the valve hand wheel positioning clamping assembly 2 and the mechanical hand wheel.

[0040] As a preferred embodiment, Figure 1 , 3 As shown, the valve handwheel positioning clamping assembly 2 includes a positioning rod 21, two handwheel clamps 22 and a connecting shaft 23. The connecting shaft 23 is vertically fixed on one side of the middle part of the positioning rod 21. The two handwheel clamps 22 are respectively assembled at both ends of the positioning rod 21, and the spacing can be adjusted along the length direction of the positioning rod 21. The two handwheel clamps 22 are respectively used to clamp the opposite sides of the mechanical handwheel. The variable speed rotation drive assembly 3 is connected to the connecting shaft 23, and is used to drive the connecting shaft 23 to drive the positioning rod 21 to rotate.

[0041] In the above implementation scheme, a connecting shaft 23 is set in the middle of the positioning rod 21, and the speed-changing rotation drive assembly 3 is connected through the connecting shaft 23. That is to say, the entire valve handwheel positioning clamping assembly 2 of the speed-changing rotation drive assembly 3 rotates around the center line of the connecting shaft 23. The two handwheel clamps 22 can adjust the displacement along the length direction of the positioning rod 21 to adapt to mechanical handwheels of different sizes. By clamping the handwheel clamps 22 with the mechanical handwheel, the mechanical handwheel can be driven to rotate under the drive of the speed-changing rotation drive assembly 3. The design is quite ingenious.

[0042] As a preferred embodiment, Figure 3 , 4 As shown, the handwheel clamp 22 includes a collar 221 and a C-shaped claw 222. The two collars 221 are respectively mounted on the two ends of the positioning rod 21. The two are respectively threadedly connected with tightening bolts 223. The tightening bolts 223 are used to be screwed until they are against or separated from the positioning rod 21. One end of the claw 222 is connected and fixed to the collar 221. The other ends of the claws 222 of the two handwheel clamps 22 are close to each other. A through slit (denoted by a in the figure) is opened in the middle part of the other ends of the claws 222 of the two handwheel clamps 22 for embedding the internal supporting connecting rod of the handwheel.

[0043] In the above implementation scheme, the other end of the claw 222 will be on the side of the mechanical handwheel close to the valve, and will be clamped on the supporting connecting rod (indicated by b in the figure) arranged circumferentially inside the mechanical handwheel through the through seam. The interior of the claw 222 is just embedded in the circular ring of the mechanical handwheel, and the ring 221 can adjust the spacing on the positioning rod 21 by loosening the tightening bolt 223 and pre-tightening after adjustment, so as to adapt to the clamping of mechanical handwheels of different sizes, and the operation is relatively convenient and simple.

[0044] In this embodiment, the positioning rod 21 is a square rod, and the corresponding collar 221 is a square annular component.

[0045] As a preferred embodiment, the above-mentioned speed-changing rotation drive assembly 3 includes a speed-changing gear box 31 and a crank 32, the output shaft of the above-mentioned speed-changing gear box 31 is coaxially connected to the above-mentioned connecting shaft 23, and the above-mentioned crank 32 is detachably connected to the output shaft of the above-mentioned speed-changing gear box 31.

[0046] In the above embodiment, the input speed of the speed change gear box 31 is lower than the output speed. When operating, the gear transmission inside the speed change gear box 31 can be driven by connecting the input shaft through the crank 32. The operation is relatively simple and fast. The end of the input shaft can be set as a hexagon, and one end of the crank 32 is provided with an inner hexagon hole adapted to the hexagon, and the two can be nested. More specifically, the crank 32 is set as a Z-shaped.

[0047] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A quick and labor-saving device for opening and closing valves, characterized in that: The invention comprises a pipeline positioning clamping assembly (1), a valve handwheel positioning clamping assembly (2) and a variable speed rotary drive assembly (3); the valve handwheel positioning clamping assembly (2) is used for clamping and connecting with a mechanical handwheel of a valve; the variable speed rotary drive assembly (3) is connected with the valve handwheel positioning clamping assembly (2) and is used for driving the valve handwheel positioning clamping assembly (2) to drive the mechanical handwheel to rotate; the variable speed rotary drive assembly (3) is mounted on the pipeline positioning clamping assembly (1); and the pipeline positioning clamping assembly (1) is used for clamping and connecting with pipelines at both ends of the valve.

2. A fast and labor-saving device for opening and closing valves according to claim 1, characterized in that: The pipeline positioning clamping assembly (1) comprises two vertical poles (11), a cross bar (12), two positioning connecting rods (13) and two groups of pipeline clamps (14). The two vertical poles (11) are arranged vertically at intervals, the cross bar (12) is arranged horizontally, and its two ends are respectively vertically connected to the two vertical poles (11). The variable speed rotation drive assembly (3) is installed on the cross bar (12). The two positioning connecting rods (13) are respectively and one by one vertically assembled on the two vertical poles (11), and the two are arranged parallel and spaced, and are respectively perpendicular to the cross bar (12). The two groups of pipeline clamps (14) are respectively installed on one end of the two positioning connecting rods (13), and the two groups of pipeline clamps (14) are respectively used to clamp the pipelines at the two ends of the valve.

3. A fast and labor-saving device for opening and closing a valve according to claim 2, characterized in that: The two ends of the cross bar (12) are respectively connected to the two vertical bars (11) via a first cross fixing clamp (121), and the two positioning connecting rods (13) are respectively connected to the two vertical bars (11) via a second cross fixing clamp (131).

4. A fast and labor-saving device for opening and closing a valve according to claim 2, characterized in that: The lower ends of the two vertical poles (11) are respectively provided with support bases (111).

5. A fast and labor-saving device for opening and closing valves according to claim 2, characterized in that: The pipe clamp (14) comprises two arc-shaped pipe clamps (141), both ends of the two pipe clamps (141) are respectively provided with connecting parts (1411), the two pipe clamps (141) are respectively attached to the two sides of the pipe, the connecting parts (1411) at both ends of the two pipe clamps (141) are respectively connected by bolts (142), and one end of the positioning connecting rod (13) is connected to a corresponding one of the pipe clamps (141).

6. A fast and labor-saving device for opening and closing a valve according to claim 5, characterized in that: One end of the positioning link (13) is provided with an external thread, and a sleeve (1412) with an internal thread is provided on the outer side of the arc top of a corresponding pipe clamp (141), and one end of the positioning link (13) is screwed into the sleeve (1412) on the corresponding pipe clamp (141).

7. A fast and labor-saving device for opening and closing a valve according to claim 2, characterized in that: The upper end of the crossbar (12) is provided with a mounting plate (122) for assembling the variable speed rotary drive assembly (3).

8. A fast and labor-saving device for opening and closing a valve according to any one of claims 1 to 7, characterized in that: The valve handwheel positioning clamping assembly (2) comprises a positioning rod (21), two handwheel clamps (22) and a connecting shaft (23); the connecting shaft (23) is vertically fixed to one side of the middle part of the positioning rod (21); the two handwheel clamps (22) are respectively mounted on both ends of the positioning rod (21), and the spacing can be adjusted along the length direction of the positioning rod (21); the two handwheel clamps (22) are respectively used to clamp the opposite sides of the mechanical handwheel; the variable speed rotation drive assembly (3) is connected to the connecting shaft (23) and is used to drive the connecting shaft (23) to drive the positioning rod (21) to rotate.

9. A fast and labor-saving device for opening and closing a valve according to claim 8, characterized in that: The hand wheel clamp (22) comprises a collar (221) and a C-shaped claw (222), the two collars (221) are respectively mounted on the two ends of the positioning rod (21), and the two are respectively threadedly connected with a tightening bolt (223), the tightening bolt (223) is used to be screwed until it abuts against or separates from the positioning rod (21), one end of the claw (222) is connected and fixed to the collar (221), the other ends of the claws (222) of the two hand wheel clamps (22) are close to each other, and a through slit for embedding a supporting connecting rod inside the hand wheel is opened in the middle part of the other ends of the claws (222) of the two hand wheel clamps (22).

10. A fast and labor-saving device for opening and closing a valve according to claim 8, characterized in that: The speed-changing rotary drive assembly (3) comprises a speed-changing gear box (31) and a crank (32); the output shaft of the speed-changing gear box (31) is coaxially connected to the connecting shaft (23); and the crank (32) is detachably connected to the output shaft of the speed-changing gear box (31).

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