Novel valve capable of preventing misoperation

Abstract

The novel valve comprises a valve body and a hand wheel, a valve rod is arranged in the valve body, a supporting table is fixedly connected to the top of the valve body, a supporting seat is fixedly connected to the top of the supporting table, a supporting frame is installed on the top of the supporting table, a sliding groove is formed in the top of the supporting frame, and a sliding block is arranged in the sliding groove; the top of the sliding block is fixedly connected with a fixing column, a fixing hole is formed in the hand wheel, the fixing column is inserted into the fixing hole, a movable groove is formed in the side edge of the sliding groove, the side edge of the sliding block is fixedly connected with a movable block, a hand screwing bolt is arranged on the side edge of the supporting frame, a first connecting hole is formed in the side edge of the supporting frame, and a second connecting hole is formed in the sliding block. A first threaded hole is formed in the side edge of the supporting frame, a hand-screwing bolt sequentially penetrates through the first connecting hole and the second connecting hole, and the hand-screwing bolt is connected with the first threaded hole, operation is convenient, use is easy, time and manpower are saved, the working efficiency is improved, valve misoperation and mistaken opening are prevented, safety is improved, and losses are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a new type of valve capable of preventing misoperation. Background Art

[0002] Valves are control components in fluid delivery systems and have functions such as shutoff, regulation, flow diversion, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief. From the simplest shut-off valve to the various valves used in extremely complex automatic control systems, there are many varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The patent with application number: CN202321163433.X discloses a ball valve that prevents accidental opening, including a valve body, a valve seat is fixedly installed on the top of the valve body, a valve stem is arranged in the valve seat, the valve stem is rotatably connected with the valve seat, a handle is arranged above the valve stem, and a screw tightening mechanism is arranged between the handle and the valve stem; a control box is fixedly installed on the top of the valve body, the control box is located on the right side of the valve seat, a first threaded rod is rotatably installed on the inner wall of the top of the control box, a lifting mechanism is arranged on the first threaded rod, a sliding hole is opened on the top of the control box, a rotating shaft is rotatably installed on the inner wall of the right side of the control box, a gear mechanism is arranged between the rotating shaft and the first threaded rod, the right end of the rotating shaft extends to the outside of the control box, a rocker mechanism is arranged on the rotating shaft, a valve core is arranged in the valve body, and the valve core is adapted to the valve stem; the screw tightening mechanism includes a bolt and a screw hole, screw holes are opened on the top of the valve stem and the handle, and the bolt is threadedly installed in the screw hole; the lifting mechanism includes a screw barrel and a stopper, and a screw sleeve is provided on the first threaded rod The cam is provided with a toothed plate, and the toothed plate ... However, the operation process is rather cumbersome, the second threaded rod is below the handle, the operating space is easily limited, the operating force required is high, and the manpower and time investment are large. Summary of the invention

[0003] The present invention aims to solve the problems existing in the above-mentioned prior art and provide a new valve that prevents misoperation. The valve is easy to operate and use, has a simple structure and a quick process, saves time and manpower, improves operating efficiency, prevents the valve from being misoperated or opened, improves safety and reduces losses.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: this new type of valve to prevent misoperation includes a valve body and a handwheel, wherein a valve stem is arranged inside the valve body, the valve stem is connected to a valve core inside the valve body, the valve stem extends upward to the top of the valve body, the top of the valve body is fixedly connected to a support platform, the top of the support platform is fixedly connected to a support seat, the valve stem is inside the support platform and the support seat, the handwheel is installed on the top of the valve stem, a support frame is installed on the top of the support platform, a slide groove is provided on the top of the support frame, a sliding block is provided inside the slide groove, a fixing column is fixedly connected to the top of the sliding block, a fixing hole is provided inside the handwheel, the fixing column is plugged into the fixing hole, a movable groove is provided on the side of the slide groove, a movable block is fixedly connected to the side of the sliding block, the movable block extends to the outside of the supporting frame through the movable groove, a hand-tightening bolt is provided on the side of the supporting frame, a first connecting hole is provided on the side of the supporting frame, a second connecting hole is provided inside the sliding block, and a support A first threaded hole is provided on the side of the support frame, and the hand-tightening bolt passes through the first connecting hole and the second connecting hole in sequence, and the hand-tightening bolt is connected to the first threaded hole. The operator holds the handwheel to rotate it, and the handwheel drives the valve stem and the valve core to rotate synchronously, and the valve is effectively closed. The handwheel is fine-tuned to keep the fixing hole and the fixing column on the same vertical center line. The operator holds the movable block and lifts it up, driving the slider to move upward in the slide groove, and the fixing column on the top of the slider reaches the handwheel and passes through the fixing hole, and the hand-tightening bolt is continuously passed through the first connecting hole and the second connecting hole, and the hand-tightening bolt is threadedly connected to the first threaded hole, so that the slider is fixed and cannot move up and down, the fixing column is fixed inside the fixing hole, and the handwheel is locked and fixed and cannot rotate. It is convenient to operate and easy to use, with a simple structure and a quick process, saving time and manpower, improving work efficiency, preventing the valve from being accidentally operated or opened, improving safety and reducing losses.

[0005] For further improvement, the support frame, the sliding block and the fixing column are respectively provided in two pieces, and there are multiple fixing holes. The two fixing columns act on the two fixing holes respectively, so as to further improve the fixing effect of the hand wheel.

[0006] For further improvement, there are multiple first connecting holes, multiple second connecting holes and multiple first threaded holes, the spacing distances between the multiple second connecting holes are equal, and multiple hand-tightening bolts are arranged on the side of the support frame. The multiple hand-tightening bolts act together on the inside of the slider to further improve the fixing effect of the slider.

[0007] For further improvement, the movable block is provided with an arc groove on the side, the surface of the hand-tightening bolt is provided with a groove, the side of the handwheel is provided with a rounded corner, the side of the support frame, the side of the slider, the top of the fixed column and the side of the movable block are also provided with a rounded corner, the side of the support table is provided with a chamfer, the bottom of the support frame and the top of the slider are also provided with a chamfer, the movable block with an arc groove is convenient for force and operation, the setting of the rounded corners and chamfers reduces sharp right-angle edges and increases the comfort of the operation process, the setting of the grooves increases friction, and it is convenient to operate the hand-tightening bolts.

[0008] To further improve, a positioning groove is provided on the top of the support platform, a positioning block is fixedly connected to the bottom of the support frame, the positioning block is inserted into the positioning groove, a first bolt is provided on the side of the support frame, a first mounting hole is provided inside the support frame, a first threaded groove is provided on the top of the support platform, the first bolt passes through the first mounting hole and is threadedly connected to the inside of the first threaded groove, there are two first bolts, the support platform is installed and positioned with the help of the positioning block and the positioning groove, the support platform is installed and fixed with the help of the first bolt, the first mounting hole and the first threaded groove, the support platform is simple to install and easy to dismantle, and the support platform and the slider are convenient to adjust and replace.

[0009] For further improvement, a first washer is sleeved on the surface of the first bolt, the first washer abuts against the support platform, and the first washer provides effective protection to prevent the bolt head from directly acting on the support frame, thereby reducing wear and abrasion marks.

[0010] To be further improved, the top of the valve stem is fixedly connected with a hexagonal prism, the bottom of the handwheel is fixedly connected with a hexagonal pipe fitting, the hexagonal pipe fitting is sleeved on the side surface of the hexagonal prism, the handwheel is simple to install and convenient to operate, and is easy to remove for replacement and adjustment, and the flexibility is further improved.

[0011] To further improve, a second bolt is provided on the side of the hexagonal tube, a second mounting hole is opened on the side of the hexagonal tube, a second threaded groove is opened on the side of the hexagonal column, a second washer is sleeved on the surface of the second bolt, the second bolt passes through the second mounting hole and is threadedly connected to the second threaded groove, and the handwheel is further fixed by means of the second bolt, the second mounting hole and the second threaded groove, so as to prevent the hexagonal tube and the handwheel from moving up and down at will, and to prevent the hexagonal tube from being forced to separate from the side surface of the hexagonal column, thereby improving the overall stability of the handwheel.

[0012] For further improvement, an extension rod is installed on the side of the handwheel, and there are multiple extension rods. A non-slip handle is fixedly connected to the side of the extension rod. The extension rod provides more operating methods, drives the handwheel to rotate, saves manpower and improves working efficiency.

[0013] To further improve, a through hole is provided on the surface of the handwheel, a second threaded hole is provided on the side of the handwheel, the second threaded hole is connected to the through hole, an inner groove is provided inside the through hole, there are multiple through holes, multiple second threaded holes and multiple inner grooves respectively, an external thread is provided on the surface of the extension rod, the extension rod is inserted into the second threaded hole, the external thread on the surface of the extension rod interacts with the internal thread of the second threaded hole, the front end of the extension rod reaches the inner groove, the extension rod is installed and fixed with the help of the second threaded hole, the inner groove and the external thread, the extension rod is simple to install and easy to dismantle, the loading and unloading process is quick, time is saved and efficiency is improved.

[0014] The beneficial effects of the present invention are:

[0015] 1. The operator holds the handwheel and rotates it, and the handwheel drives the valve stem and the valve core to rotate synchronously, so that the valve is effectively closed. The handwheel is fine-tuned to keep the fixed hole and the fixed column on the same vertical center line. The operator holds the movable block and lifts it up, driving the slider to move upward in the slide slot. The fixed column on the top of the slider reaches the handwheel and passes through the fixed hole. The hand-tightening bolt passes through the first connecting hole and the second connecting hole in succession, and the hand-tightening bolt is threadedly connected to the first threaded hole. The slider is fixed and cannot move up and down, the fixed column is fixed inside the fixed hole, and the handwheel is locked and fixed and cannot rotate. It is convenient to operate and easy to use, with a simple structure and a quick process, saving time and manpower, improving work efficiency, preventing the valve from being accidentally operated or opened, improving safety and reducing losses.

[0016] 2. The support platform is installed and positioned with the help of the positioning block and the positioning groove. The support platform is installed and fixed with the help of the first bolt, the first mounting hole and the first threaded groove. The support platform is easy to install and dismantle. The support platform and the slider are convenient to adjust and replace. The first washer provides effective protection to prevent the bolt head from directly acting on the support frame, thereby reducing wear and abrasion marks.

[0017] 3. The handwheel is easy to install and operate, and can be easily dismantled for replacement and adjustment, which further improves flexibility. The handwheel is further fixed with the help of the second bolt, the second mounting hole and the second threaded groove to prevent the hexagonal pipe fitting and the handwheel from moving up and down at will, and to prevent the hexagonal pipe fitting from being forced away from the side surface of the hexagonal prism, thereby improving the overall stability of the handwheel.

[0018] 4. The extension rod provides more operation methods, drives the hand wheel to rotate, saves manpower and improves work efficiency. The extension rod is installed and fixed with the help of the second threaded hole, inner groove and outer thread. The extension rod is easy to install and dismantle, and the loading and unloading process is quick, saving time and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 It is a diagram showing the structure of the hand wheel of the present invention;

[0022] Figure 4 This is a bottom view of the hand wheel of the present invention;

[0023] Figure 5 For the present invention Figure 1 Enlarged view of point B in the middle;

[0024] Figure 6 This is a diagram showing the hand-tightening bolt activity of the present invention;

[0025] Figure 7 For the present invention Figure 1 Enlarged view of point C in the middle;

[0026] Figure 8 This is a diagram showing the installation of the support frame of the present invention;

[0027] Fig. 9 It is a diagram showing the support frame structure of the present invention;

[0028] Fig.10 It is a front view of the structure of the present invention;

[0029] Fig.11 For the present invention Fig.10 Enlarged view of point D in the middle;

[0030] Fig.12 This is a second bolt activity display diagram of the present invention.

[0031] Explanation of the accompanying drawings: 1. valve body; 2. hand wheel; 3. valve stem; 4. support platform; 5. support seat; 6. support frame; 7. slide groove; 8. slider; 9. fixed column; 10. fixed hole; 11. movable groove; 12. movable block; 13. hand-tightening bolt; 14. first connecting hole; 15. second connecting hole; 16. first threaded hole; 17. arc groove; 18. concave pattern; 19. fillet; 20. chamfer; 21. positioning groove; 22. positioning block; 23. first bolt; 24. first mounting hole; 25. first threaded groove; 26. first washer; 27. hexagonal column; 28. hexagonal pipe fitting; 29. ​​second bolt; 30. second mounting hole; 31. second threaded groove; 32. second washer; 33. extension rod; 34. non-slip handle; 35. through hole; 36. second threaded hole; 37. inner groove; 38. outer thread. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-12 This embodiment is further described:

[0033] like Figure 1-12As shown: In this embodiment, a new type of valve for preventing misoperation includes a valve body 1 and a hand wheel 2. A valve stem 3 is arranged inside the valve body 1. The valve stem 3 is connected to the valve core inside the valve body 1. The valve stem 3 extends upward to the top of the valve body 1. A support platform 4 is fixedly connected to the top of the valve body 1. A support seat 5 is fixedly connected to the top of the support platform 4. The valve stem 3 is inside the support platform 4 and the support seat 5. The hand wheel 2 is installed on the top of the valve stem 3. A support frame 6 is installed on the top of the support platform 4. A slide groove 7 is opened on the top of the support frame 6. A slider 8 is arranged inside the slide groove 7. A fixing column 9 is fixedly connected to the top of the slider 8. A fixing hole 10 is opened inside the hand wheel 2. The fixing column 9 is inserted into the fixing hole 10. A movable groove 11 is opened on the side of the slide groove 7. A movable block 12 is fixedly connected to the side of the slider 8. The movable block 12 extends to the outside of the support frame 6 through the movable groove 11. A hand-tightening bolt 13 is arranged on the side of the support frame 6 A first connecting hole 14 is provided on the side of the support frame 6, a second connecting hole 15 is provided inside the slider 8, a first threaded hole 16 is provided on the side of the support frame 6, a hand-tightening bolt 13 passes through the first connecting hole 14 and the second connecting hole 15 in sequence, and the hand-tightening bolt 13 is connected to the first threaded hole 16, the support frame 6, the slider 8 and the fixing column 9 have two respectively, there are multiple fixing holes 10, there are multiple first connecting holes 14, second connecting holes 15 and first threaded holes 16 respectively, and the intervals between the multiple second connecting holes 15 are equal, an arc groove 17 is provided on the side of the movable block 12, a concave pattern 18 is provided on the surface of the hand-tightening bolt 13, a rounded corner 19 is provided on the side of the hand wheel 2, and a rounded corner 19 is also provided on the side of the support frame 6, the side of the slider 8, the top of the fixing column 9 and the side of the movable block 12, a chamfer 20 is provided on the side of the support table 4, and a chamfer 20 is also provided on the bottom of the support frame 6 and the top of the slider 8.

[0034] like Figure 7-9 As shown: a positioning groove 21 is provided on the top of the support platform 4, a positioning block 22 is fixedly connected to the bottom of the support frame 6, the positioning block 22 is inserted into the positioning groove 21, a first bolt 23 is provided on the side of the support frame 6, a first mounting hole 24 is provided inside the support frame 6, a first threaded groove 25 is provided on the top of the support platform 4, the first bolt 23 passes through the first mounting hole 24 and is threadedly connected to the inside of the first threaded groove 25, there are two first bolts 23, a first washer 26 is sleeved on the surface of the first bolt 23, and the first washer 26 resists the support platform 4.

[0035] like Figure 3 , Figure 4 , Fig.11 and Fig.12As shown: a hexagonal column 27 is fixedly connected to the top of the valve stem 3, a hexagonal pipe fitting 28 is fixedly connected to the bottom of the handwheel 2, the hexagonal pipe fitting 28 is sleeved on the side surface of the hexagonal column 27, a second bolt 29 is arranged on the side of the hexagonal pipe fitting 28, a second mounting hole 30 is opened on the side of the hexagonal pipe fitting 28, a second thread groove 31 is opened on the side of the hexagonal column 27, a second washer 32 is sleeved on the surface of the second bolt 29, the second bolt 29 passes through the second mounting hole 30 and is threadedly connected to the second thread groove 31.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Fig.10 , Fig.11 and Fig.12 As shown: an extension rod 33 is installed on the side of the handwheel 2, and there are multiple extension rods 33. A non-slip handle 34 is fixedly connected to the side of the extension rod 33. A through hole 35 is opened on the surface of the handwheel 2. A second threaded hole 36 is opened on the side of the handwheel 2. The second threaded hole 36 is communicated with the through hole 35. An inner groove 37 is arranged inside the through hole 35. There are multiple through holes 35, second threaded holes 36 and inner grooves 37 respectively. An external thread 38 is arranged on the surface of the extension rod 33. The extension rod 33 is inserted into the second threaded hole 36. The external thread 38 on the surface of the extension rod 33 interacts with the internal thread of the second threaded hole 36, and the front end of the extension rod 33 reaches the inside of the inner groove 37.

[0037] When the present invention is in use: obtain the handwheel 2, sleeve the hexagonal tube 28 at the bottom of the handwheel 2 with the hexagonal column 27 at the top of the valve stem 3, obtain the second bolt 29 and the second washer 32, sleeve the second bolt 29 with the second washer 32, the second bolt 29 passes through the second mounting hole 30 and is threadedly connected with the second thread groove 31, tighten the second bolt 29 to achieve the installation and fixation of the handwheel 2, insert the slider 8 into the slide groove 7 of the support frame 6, place the integral part of the support frame 6 and the slider 8 on the top of the support platform 4, insert the positioning block 22 at the bottom of the support frame 6 into the positioning groove 21 at the top of the support platform 4, obtain two first bolts 23 and two first washers 26, and the two The first bolts 23 are first respectively sleeved with the first washers 26, and the two first bolts 23 pass through the first mounting holes 24 respectively. The two first bolts 23 are respectively threadedly connected with the first thread grooves 25, and the two first bolts 23 are tightened to realize the installation and fixation of the support frame 6. Refer to this operation to complete the installation and fixation of another support frame 6. The operator holds the handwheel 2 and rotates it. The handwheel 2 drives the valve stem 3 and the valve core to rotate synchronously, and the valve is effectively opened or closed. When the handwheel 2 is inconvenient to operate, multiple extension rods 33 are obtained, and the front end of one of the extension rods 33 is inserted into the second threaded hole 36. The front end of the extension rod 33 reaches the inside of the through hole 35, and the extension rod 33 is rotated. The external thread 38 on the surface of 33 interacts with the internal thread of the second threaded hole 36, and the front end of the extension rod 33 reaches the inside of the inner groove 37 to complete the installation of one extension rod 33. The installation of multiple extension rods 33 can be completed by referring to this operation. The operation of the extension rod 33 drives the hand wheel 2, the valve stem 3 and the valve core to rotate synchronously, saving manpower and improving work efficiency. When the valve is closed, the hand wheel 2 is fine-tuned to keep the fixing hole 10 and the fixing column 9 on the same vertical center line. The operator holds the movable block 12 and lifts it up, driving the slider 8 to move upward in the slide groove 7. The fixing column 9 at the top of the slider 8 reaches the hand wheel 2 and passes through the fixing hole 10, and the hand-tightening bolt 13 is continuously passed through the first connecting hole 14 and the second The connecting hole 15, the hand-tightening bolt 13 is threadedly connected to the first threaded hole 16, the slider 8 is fixed and cannot move up and down, the fixing column 9 is fixed inside the fixing hole 10, and the handwheel 2 is locked and fixed and cannot rotate. The same operation method fixes the second fixing column 9 inside the second fixing hole 10, further improving the fixing effect of the handwheel 2, and the two support frames 6 are respectively provided with a plurality of hand-tightening bolts 13 connected, and the plurality of hand-tightening bolts 13 act together on the slider 8, further improving the fixing effect of the slider 8. The whole process is convenient to operate and easy to use, the structure is simple and the process is fast, time and manpower are saved, work efficiency is improved, and misoperation and misopening of the valve are prevented, safety is improved and losses are reduced.

[0038] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A new type of valve for preventing misoperation, comprising a valve body (1) and a hand wheel (2), characterized in that: The valve body (1) is provided with a valve stem (3) inside, the valve stem (3) is connected to the valve core inside the valve body (1), the valve stem (3) extends upward to the top of the valve body (1), the top of the valve body (1) is fixedly connected to a support platform (4), the top of the support platform (4) is fixedly connected to a support seat (5), the valve stem (3) is inside the support platform (4) and the support seat (5), the hand wheel (2) is installed on the top of the valve stem (3), the top of the support platform (4) is installed with a support frame (6), the top of the support frame (6) is provided with a slide groove (7), the slide groove (7) is provided with a slider (8), the top of the slider (8) is fixedly connected to a fixing column (9), and the hand wheel (2) is provided with a fixing hole (10) The fixing column (9) is inserted into the fixing hole (10), the side of the slide groove (7) is provided with a movable groove (11), the side of the slider (8) is fixedly connected with a movable block (12), the movable block (12) extends to the outside of the support frame (6) through the movable groove (11), the side of the support frame (6) is provided with a hand bolt (13), the side of the support frame (6) is provided with a first connecting hole (14), the inside of the slider (8) is provided with a second connecting hole (15), the side of the support frame (6) is provided with a first threaded hole (16), the hand bolt (13) passes through the first connecting hole (14) and the second connecting hole (15) in sequence, and the hand bolt (13) is connected to the first threaded hole (16).

2. A new type of valve for preventing misoperation according to claim 1, characterized in that: There are two supporting frames (6), two sliding blocks (8) and two fixing columns (9), and there are multiple fixing holes (10).

3. A new type of valve for preventing misoperation according to claim 1, characterized in that: There are a plurality of the first connection holes (14), the second connection holes (15) and the first threaded holes (16), respectively, and the spacing distances between the plurality of second connection holes (15) are equal.

4. A new type of valve for preventing misoperation according to claim 1, characterized in that: The movable block (12) is provided with an arc groove (17) on the side, the hand-tightening bolt (13) is provided with a concave pattern (18) on the surface, the hand wheel (2) is provided with a rounded corner (19) on the side, the support frame (6) side, the slider (8) side, the top of the fixed column (9) and the movable block (12) side are also provided with a rounded corner (19), the support platform (4) is provided with a chamfer (20) on the side, and the bottom of the support frame (6) and the top of the slider (8) are also provided with a chamfer (20).

5. The novel valve for preventing misoperation according to claim 1 is characterized in that: The support platform (4) has a positioning groove (21) on the top, a positioning block (22) is fixedly connected to the bottom of the support frame (6), the positioning block (22) is inserted into the positioning groove (21), a first bolt (23) is arranged on the side of the support frame (6), a first mounting hole (24) is arranged inside the support frame (6), a first thread groove (25) is arranged on the top of the support platform (4), the first bolt (23) passes through the first mounting hole (24) and is threadedly connected to the inside of the first thread groove (25), and there are two first bolts (23).

6. A new type of valve for preventing misoperation according to claim 5, characterized in that: A first washer (26) is sleeved on the surface of the first bolt (23), and the first washer (26) abuts against the support platform (4).

7. A new type of valve for preventing misoperation according to claim 1, characterized in that: The top of the valve stem (3) is fixedly connected to a hexagonal column (27), the bottom of the hand wheel (2) is fixedly connected to a hexagonal pipe fitting (28), and the hexagonal pipe fitting (28) is sleeved on the side surface of the hexagonal column (27).

8. A new type of valve for preventing misoperation according to claim 7, characterized in that: A second bolt (29) is arranged on the side of the hexagonal tube (28), a second mounting hole (30) is opened on the side of the hexagonal tube (28), a second thread groove (31) is opened on the side of the hexagonal column (27), a second washer (32) is sleeved on the surface of the second bolt (29), and the second bolt (29) passes through the second mounting hole (30) and is threadedly connected to the second thread groove (31).

9. The novel valve for preventing misoperation according to claim 1 is characterized in that: An extension rod (33) is installed on the side of the hand wheel (2), there are multiple extension rods (33), and a non-slip handle (34) is fixedly connected to the side of the extension rod (33).

10. A new type of valve for preventing misoperation according to claim 9, characterized in that: The hand wheel (2) is provided with a through hole (35) on its surface, and a second threaded hole (36) is provided on the side of the hand wheel (2). The second threaded hole (36) and the through hole (35) are communicated with each other. An inner groove (37) is provided inside the through hole (35). There are a plurality of through holes (35), a plurality of second threaded holes (36) and an inner groove (37). An outer thread (38) is provided on the surface of the extension rod (33). The extension rod (33) is inserted into the second threaded hole (36). The outer thread (38) on the surface of the extension rod (33) interacts with the inner thread of the second threaded hole (36). The front end of the extension rod (33) reaches the inner groove (37).

Images