A clamping tool for welding automobile parts with fume purification function

Abstract

The present invention discloses a clamping tool for welding automobile parts with a fume purification function, comprising a fixed base for bearing, a fixed clamping plate, an activated carbon purification net, an adjustment mechanism, a limiting mechanism and a mounting block, wherein a suction device is installed in the middle of the fixed base, the fixed clamping plate is used to clamp and fix the welded automobile parts, the activated carbon purification net is fixedly connected to the middle of the fixed frame, the adjustment mechanism is arranged at the lower end of the fixed bracket, the limiting mechanism is arranged at the upper end of the fixed bracket, and the mounting block is connected to a connecting column in a "T"-shaped structure by rotation. The clamping tool for welding automobile parts with a fume purification function facilitates the purification of the fume generated during the welding process through the activated carbon purification net, facilitates the clamping of automobile parts of different sizes and the adjustment of the welding angle of automobile parts, and improves the welding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field related to automobile parts welding, in particular to a clamping tool for automobile parts welding with a fume purification function. Background Art

[0002] Auto parts refer to the various units that make up the whole of a car and a product that serves the car. There are many types of auto parts. In the process of producing and processing auto parts, it is necessary to weld different parts. In the process of welding auto parts, it is necessary to use corresponding auto parts clamping tools to clamp and limit the auto parts. The clamping tools play an important role in the welding process of auto parts.

[0003] However, the commonly used clamping tools for welding automotive parts still have the following shortcomings:

[0004] 1. The existing clamping tooling for welding automobile parts generates smoke during the welding process, which is dispersed in the air, affecting the health of operators and is inconvenient to purify the generated smoke;

[0005] 2. The existing clamping tooling for welding automobile parts is not convenient to adjust the clamping effect of the tooling according to the size of the parts, resulting in limitations in the use of the clamping tooling, unstable clamping state of the parts, and easy loosening during the clamping process;

[0006] 3. The existing clamping tooling for welding automobile parts is not convenient for adjusting the welding angle of the parts during the welding operation. The parts need to be repeatedly removed and fixed, and the operation steps are numerous and the practicality is not high.

[0007] Therefore, we propose a clamping tool for welding automobile parts with a fume purification function to solve the above-mentioned problems. Summary of the invention

[0008] The purpose of the present invention is to provide a clamping tool for welding automobile parts with a fume purification function, so as to solve the problems proposed in the above-mentioned background technology that the accessories generate fume floating in the air during the welding process, affecting the health of the operator, and it is inconvenient to purify the generated fume, and it is inconvenient to adjust the clamping effect of the tool according to the size of the accessory, resulting in limitations in the use scenarios of the clamping tool, unstable clamping state of the accessory, easy to loosen during the clamping process, inconvenient to adjust the welding angle of the accessory during the accessory welding operation, and the accessories need to be repeatedly removed and fixed, with many operating steps and low practicality.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solutions: A clamping tool for welding automobile parts with a fume purification function, comprising a fixed base for bearing, a suction device is installed in the middle of the fixed base, and fixed brackets in a vertical state are arranged on both sides above the fixed base, and the fixed base is directly placed on the ground;

[0010] A fixing clamp, which is used to clamp and fix the welded automobile parts, and the fixing clamp is connected to the screw rod used for adjustment by means of threads, and the screw rod is rotatably connected to the middle part of the mounting block, and the threads at the upper and lower ends of the screw rod are in opposite directions;

[0011] Also includes:

[0012] An activated carbon purification net, which is fixedly connected to the middle of the fixing frame and is used to purify the fume generated during welding, and the fixing frame is fixedly connected to the upper end of the wind hood by bolts, and the wind hood is connected to the suction end of the suction device;

[0013] An adjustment mechanism, wherein the adjustment mechanism is arranged at the lower end of the fixed bracket, and the adjustment mechanism is used to adjust the position of the fixed bracket, and the adjustment mechanism drives the fixed bracket and the fixed base to form a relative sliding structure, and the fixed bracket is vertically arranged at the upper end of the fixed base;

[0014] A limiting mechanism, wherein the limiting mechanism is arranged at the upper end of the fixing bracket and is used to limit the position between the fixing bracket and the connecting handle;

[0015] Wherein, the limiting mechanism comprises a movable block arranged at the upper end of the fixed bracket, a fixed sleeve with a limiting function, a torsion spring arranged at the connection between the fixed sleeve and the movable block, and a fixing bolt for locking;

[0016] The mounting block is connected to the connecting column in a "T"-shaped structure by rotation, and the outer surface of the mounting block is provided with convex blocks with limiting functions at equal angles, and the mounting block and the connecting column are limited by a movable frame and the convex blocks.

[0017] Preferably, the adjustment mechanism includes a fixing column with threads on the outer surface, a fixing plate fixedly connected to the lower end of the fixing bracket, a moving wheel installed at the lower end of the fixing plate, a connecting sleeve for adjustment and a connecting plate for connection.

[0018] Preferably, the fixing column is fixedly connected to the left and right ends of the fixing base, and the fixing column is connected to the connecting sleeve by means of threads, and the connecting sleeve is connected to the connecting plate by means of rotation.

[0019] Preferably, the connecting plate is fixedly connected to one side of the fixing plate close to the vertical central axis of the fixing base, and the middle part of the fixing plate is connected to the fixing column, and the fixing plate and the fixed base are connected by a card slot, and the fixing plate drives the connecting plate to drive the moving wheel to roll inside the fixed base through the connecting sleeve.

[0020] Preferably, a vertical fixing rod is fixedly connected to the middle of the fixing bracket, and the fixing rod is connected to the movable plate in a sliding manner, and the movable plate is fixedly connected to the lower end of the connecting bracket by bolts, and the connecting bracket forms a lifting structure on the inner side of the fixed bracket through gears.

[0021] Preferably, the gear is connected to the upper end of the fixed bracket by rotation, and the gear is divided into two monomers, front and rear, and the gear is connected to the connecting bracket by meshing.

[0022] Preferably, the monomer on the rear side of the gear is fixedly connected to the connecting handle, and the connecting handle is connected to the fixing sleeve by snapping, and the fixing sleeve forms a flip structure on the side of the movable block away from the vertical central axis of the fixed base.

[0023] Preferably, the movable block is rotatably connected to the upper end of the fixed bracket, and the movable block and the fixed bracket are limited by a fixing bolt, and the fixing bolt and the movable block as well as the fixing bolt and the fixed bracket are all threadedly connected.

[0024] Preferably, the upper end of the connecting bracket is fixedly connected to the connecting column, and a movable frame with a frame-shaped structure is sleeved on the outer surface of the connecting column, and a spring is provided at the connection between the connecting column and the movable frame, and the upper end of the connecting column is fixedly connected to a mounting column with a threaded outer surface of the upper end.

[0025] Preferably, the mounting post is inserted into the upper end of the movable frame, and the mounting post is connected to a mounting sleeve for locking by means of a thread, and the mounting sleeve is fitted on the upper surface of the movable frame, and the movable frame is snap-fitted to the protrusion at the corresponding position.

[0026] Compared with the prior art, the invention has the following beneficial effects: the clamping tool for welding automobile parts with fume purification function, in actual use, uses the suction device to suck air, so that the fume generated during welding is purified by the activated carbon purification net, preventing the fume from floating in the air and affecting the health of the workers; the adjustment mechanism drives the fixed bracket and the fixed base to slide, and the connecting bracket is lifted and lowered on the inner side of the fixed bracket, so that the spacing between the fixed clamping plates on the left and right sides can be adjusted, so that automobile parts of different sizes can be clamped; the mounting block and the connecting column are rotated, so that the welding angle of the automobile parts can be adjusted, and there is no need to repeatedly disassemble and assemble the automobile parts during welding, which simplifies the operation steps and improves the welding efficiency;

[0027] 1. It is equipped with a wind hood, an activated carbon purification net and a fixed frame. A suction device is installed at the lower end of the fixed base, and the suction end of the suction device is connected to the wind hood. The activated carbon purification net is set, and the activated carbon purification net is fixedly connected to the middle of the fixed frame, which is convenient for purifying the fume generated during the welding process during the welding operation to prevent the fume from floating in the air and affecting the health of the operator;

[0028] 2. A fixed bracket, an adjustment mechanism and a connecting bracket are provided, and the fixed bracket, the adjustment mechanism and the connecting bracket are symmetrically arranged at the left and right ends of the fixed base. The setting of the adjustment mechanism facilitates the sliding between the fixed bracket and the fixed base, and the meshing connection between the gear and the connecting bracket drives the connecting bracket to rise and fall on the inner side of the fixed bracket, and the spacing between the fixed splints on the left and right sides can be adjusted, and the auto parts of different sizes can be clamped and limited. Combined with the setting of the limiting mechanism, it is convenient to limit the connection handle and the fixed bracket, and the stability is good;

[0029] 3. It is equipped with a mounting block, a connecting column, a fixed splint and a movable frame. The fixing splint is used to clamp and fix the accessories with good fastness. The connecting column and the mounting block are rotated to facilitate adjustment of the welding angle of the accessories. There is no need to repeatedly disassemble and install the accessories, which greatly simplifies the operation steps. The movable frame is engaged with the protrusion to facilitate limiting the mounting block and the connecting column. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front view structural schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the top view of the structure of the air hood, the activated carbon purification net and the fixed base connected to each other in the present invention;

[0032] Figure 3 This is a schematic diagram of the front view structure of the air hood, activated carbon purification net and fixed frame connected to the present invention;

[0033] Figure 4 It is a schematic diagram of the front view cross-section structure of the connection between the fixing column, the fixing plate, the connecting sleeve and the connecting plate of the present invention;

[0034] Figure 5 It is a schematic diagram of the side view structure of the connection bracket, gear and connection handle of the present invention;

[0035] Figure 6 This is a schematic diagram of the front view and section structure of the connection between the mounting block, the fixing clamp, the connecting column and the movable frame of the present invention;

[0036] Figure 7 It is a schematic diagram of the side view structure of the connection between the mounting block, the protrusion, the movable frame and the connecting column of the present invention;

[0037] Figure 8 It is a schematic diagram of the top view of the connection structure of the fixing clamp plate, the connecting column and the mounting block of the present invention;

[0038] Fig. 9 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0039] Fig.10 This is a front view structural diagram of the connection between the movable frame, the mounting column and the mounting sleeve of the present invention;

[0040] Fig.11 This is a front view structural schematic diagram of the connection between the connecting handle and the fixing sleeve of the present invention.

[0041] In the figure: 1. fixed base; 2. air suction device; 3. wind hood; 4. activated carbon purification net; 5. fixed frame; 6. fixed bracket; 7. adjustment mechanism; 8. fixed column; 9. fixed plate; 10. moving wheel; 11. connecting sleeve; 12. connecting plate; 13. fixed rod; 14. movable plate; 15. connecting bracket; 16. gear; 17. connecting handle; 18. limiting mechanism; 19. movable block; 20. fixed sleeve; 21. torsion spring; 22. fixing bolt; 23. mounting block; 24. screw rod; 25. fixed splint; 26. connecting column; 27. movable frame; 28. spring; 29. ​​mounting column; 30. bump; 31. mounting sleeve. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-11The present invention provides a technical solution: a clamping tool for welding automobile parts with a fume purification function, comprising a fixed base 1, an air suction device 2, a wind hood 3, an activated carbon purification net 4, a fixed frame 5, a fixed bracket 6, an adjustment mechanism 7, a fixed column 8, a fixed plate 9, a moving wheel 10, a connecting sleeve 11, a connecting plate 12, a fixed rod 13, a movable plate 14, a connecting bracket 15, a gear 16, a connecting handle 17, a limiting mechanism 18, a movable block 19, a fixed sleeve 20, a torsion spring 21, a fixing bolt 22, a mounting block 23, a screw rod 24, a fixed splint 25, a connecting column 26, a movable frame 27, a spring 28, a mounting column 29, a protrusion 30 and a mounting sleeve 31.

[0044] When using the automobile parts welding clamping tool with fume purification function, Figure 1 and Figure 4 As shown, the fixed base 1 is directly placed on the ground, and fixed brackets 6 are provided at both left and right ends above the fixed base 1, and an adjusting mechanism 7 is provided at the lower end of the fixed bracket 6. First, according to the size of the welded automotive accessories, the spacing between the fixed brackets 6 on the left and right sides is adjusted. The adjusting mechanism 7 includes a fixed column 8 with a thread on the outer surface, a fixed plate 9 fixedly connected to the lower end of the fixed bracket 6, a moving wheel 10 installed at the lower end of the fixed plate 9, a connecting sleeve 11 for adjustment and a connecting plate 12 for connection. The fixed column 8 is fixedly connected to the left and right ends of the fixed base 1, and the connecting sleeve 11 connected to the outer surface of the fixed column 8 by rotating the thread, and the connecting sleeve 11 and the connecting plate 12 are connected by rotation, and the connecting plate 12 is fixedly connected to the lower end of the fixed plate 9. The connecting sleeve 11 pushes the fixed plate 9 and the fixed base 1 to slide through the connecting plate 12. The lower end of the fixed plate 9 is installed with a moving wheel 10, and the fixed plate 9 drives the moving wheel 10 to move at the bottom end of the fixed base 1.

[0045] The upper end of the fixing plate 9 is fixedly connected to the fixing bracket 6, and the fixing plate 9 drives the fixing bracket 6 to move above the fixing base 1, so as to facilitate the adjustment of the spacing between the fixing brackets 6 on the left and right sides. When adjusted to a suitable position, Figure 1 , Figure 5 , Fig. 9 and Fig.11As shown, a fixing rod 13 is fixedly connected to the middle part of the fixing bracket 6, and the fixing rod 13 is slidably connected to the movable plate 14, and the movable plate 14 is fixedly connected to the lower end of the connecting bracket 15 by bolts, and the interior of the connecting bracket 15 is meshed with the gear 16, and the gear 16 is divided into two monomers, front and rear, and the gear 16 at the rear end is fixedly connected to the connecting handle 17, and the gear 16 is rotatably connected to the fixing bracket 6, and the connecting handle 17 and the fixing bracket 6 are limited by a limiting mechanism 18, and the limiting mechanism 18 includes a movable block 19 arranged at the upper end of the fixing bracket 6, a fixing sleeve 20 with a limiting function, a torsion spring 21 arranged at the connection between the fixing sleeve 20 and the movable block 19, and a fixing bolt 22 for locking.

[0046] The fixing bolt 22 is first rotated, and the fixing bolt 22 and the movable block 19 as well as the fixing bolt 22 and the fixing bracket 6 are all threadedly connected. The fixing bolt 22 releases the limit between the movable block 19 and the fixing bracket 6, and then the fixing sleeve 20 is pulled upward, and the fixing sleeve 20 is turned over on the movable block 19. At this time, the torsion spring 21 is elastically deformed, and the fixing sleeve 20 is disengaged from the connecting handle 17, and the limit between the connecting handle 17 and the fixing bracket 6 is released. Then the connecting handle 17 is rotated, and the connecting handle 17 drives the gear 16 to rotate on the right side of the fixing bracket 6. At the same time, the gear 16 is meshed and connected with the gear 16, and the gear 16 is meshed and connected with the inner side of the connecting bracket 15, so that the connecting bracket 15 drives the movable plate 14 to slide between the fixing rod 13 in the vertical state, drives the connecting bracket 15 to rise and fall on the inner side of the fixing bracket 6, and adjusts the height of the fixing clamp 25, so that the accessories can be clamped and limited according to the size of the actual automobile accessories.

[0047] After the adjustment is completed, Figure 6 and Figure 8 As shown, the automobile parts to be welded are placed between the fixed clamping plates 25 and the fixed clamping plates 25, and then the screw rod 24 is rotated. The screw rod 24 rotates inside the mounting block 23. The screw rod 24 and the fixed clamping plates 25 are connected by threads, and the threads at the upper and lower ends of the screw rod 24 are in opposite directions. The screw rod 24 drives the fixed clamping plates 25 to slide on the mounting block 23, and the automobile parts are clamped and limited by the fixed clamping plates 25. After the clamping is completed, the automobile parts are welded, and as shown in FIG. Figure 1 , Figure 2 and Figure 3As shown, during welding, the suction device 2 installed in the middle of the fixed base 1 is turned on, the suction end of the suction device 2 is connected to the wind hood 3, and the upper end of the wind hood 3 is provided with an activated carbon purification net 4, the activated carbon purification net 4 is fixedly connected to the middle of the fixed frame 5, and the fixed frame 5 and the wind hood 3 are fixedly connected by bolts. The suction device 2 is used for suction, and combined with the setting of the activated carbon purification net 4, the fume generated during the welding process can be purified to prevent the fume from floating in the air and the operator from inhaling a large amount of fume, which endangers the operator's health.

[0048] In addition, during the welding process, if Figure 6 , Figure 7 and Fig.10 As shown, the upper end of the connecting bracket 15 is fixedly connected to the connecting column 26 in a "T"-shaped structure, and the connecting column 26 is rotatably connected to the mounting block 23, and the mounting block 23 and the connecting column 26 are limited by the movable frame 27. The upper end of the connecting column 26 is fixedly connected to the mounting column 29 in a vertical state, and the mounting sleeve 31 threadedly connected to the outer surface of the mounting column 29 is rotated to disengage the mounting sleeve 31 from the mounting column 29, loosening the limit between the movable frame 27 and the mounting block 23, and then pulling the movable frame 27 upward, the movable frame 27 and the mounting column 29 slide, and the movable frame 27 and the connecting column 26 are moved. A spring 28 is arranged between the movable frame 27, and the spring 28 is squeezed by the movable frame 27, so that the spring 28 is elastically deformed. At this time, the movable frame 27 is separated from the protrusion 30, and the limit between the connecting column 26 and the mounting block 23 is released. The protrusion 30 is arranged at an equal angle on the outer surface of the mounting block 23, and then the mounting block 23 is rotated, and the mounting block 23 and the connecting column 26 are rotated. The mounting block 23 drives the automobile accessories to flip over the top of the fixed base 1, so as to facilitate the adjustment of the welding angle of the automobile accessories, without the need to repeatedly and fix the automobile accessories, which greatly simplifies the operation steps and improves the welding efficiency.

[0049] After the angle adjustment is completed, the movable frame 27 is released. At this time, the spring 28 recovers its elastic deformation, driving the movable frame 27 to move downward. At this time, the upper end of the movable frame 27 is engaged with the protrusion 30 at the corresponding position, limiting the connection column 26 and the mounting block 23. Then, the mounting sleeve 31 threadedly connected to the outer surface of the upper end of the mounting column 29 is rotated so that the mounting sleeve 31 is fitted on the upper surface of the movable frame 27. The mounting sleeve 31 is used to further limit the connection between the movable frame 27 and the mounting column 29 to prevent the mounting block 23 from loosening from the connecting column 26. The fastening is good, the operation is convenient, and the use is very convenient.

[0050] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. The standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamping tool for welding automobile parts with a fume purification function, comprising a fixed base (1) for bearing, a suction device (2) being installed in the middle of the fixed base (1), and fixed brackets (6) in a vertical state being arranged on both left and right sides above the fixed base (1), and the fixed base (1) being directly placed on the ground; A fixing clamp (25), the fixing clamp (25) being used to clamp and fix the welded automobile parts, and the fixing clamp (25) is connected to the screw rod (24) used for adjustment by means of threads, and the screw rod (24) is rotatably connected to the middle part of the mounting block (23), and the threads at the upper and lower ends of the screw rod (24) are in opposite directions; It is characterized in that Also includes: An activated carbon purification net (4), the activated carbon purification net (4) being fixedly connected to the middle of the fixing frame (5), and the activated carbon purification net (4) being used to purify the fume generated during the welding process, and the fixing frame (5) being fixedly connected to the upper end of the wind hood (3) by bolts, and the wind hood (3) being connected to the suction end of the suction device (2); an adjusting mechanism (7), wherein the adjusting mechanism (7) is arranged at the lower end of the fixed bracket (6), and the adjusting mechanism (7) is used to adjust the position of the fixed bracket (6), and the adjusting mechanism (7) drives the fixed bracket (6) and the fixed base (1) to form a relative sliding structure, and the fixed bracket (6) is arranged vertically at the upper end of the fixed base (1); a limiting mechanism (18), wherein the limiting mechanism (18) is arranged at the upper end of the fixed bracket (6), and the limiting mechanism (18) is used to limit the position between the fixed bracket (6) and the connecting handle (17); The limiting mechanism (18) comprises a movable block (19) arranged at the upper end of the fixed bracket (6), a fixed sleeve (20) having a limiting function, a torsion spring (21) arranged at the connection between the fixed sleeve (20) and the movable block (19), and a fixing bolt (22) for locking; A mounting block (23), wherein the mounting block (23) is connected to a connecting column (26) in a T-shaped structure by rotation, and a protrusion (30) having a limiting function is provided at an equal angle on the outer surface of the mounting block (23), and the mounting block (23) and the connecting column (26) are limited by a movable frame (27) and the protrusion (30); The adjustment mechanism (7) comprises a fixing column (8) having a threaded outer surface, a fixing plate (9) fixedly connected to the lower end of the fixing bracket (6), a moving wheel (10) mounted on the lower end of the fixing plate (9), a connecting sleeve (11) for adjustment, and a connecting plate (12) for connection; The fixing column (8) is fixedly connected to the left and right ends of the fixing base (1), and the fixing column (8) and the connecting sleeve (11) are connected by means of threads, and the connecting sleeve (11) and the connecting plate (12) are connected by means of rotation; The connecting plate (12) is fixedly connected to a side of the fixing plate (9) close to the vertical central axis of the fixing base (1), and the middle part of the fixing plate (9) is connected to the fixing column (8), and the fixing plate (9) and the fixing base (1) are connected by means of a slot, and the fixing plate (9) drives the connecting plate (12) through the connecting sleeve (11) to drive the moving wheel (10) to roll inside the fixing base (1); A fixed rod (13) in a vertical state is fixedly connected to the middle of the fixed bracket (6), and the fixed rod (13) and the movable plate (14) are connected in a sliding manner, and the movable plate (14) is fixedly connected to the lower end of the connecting bracket (15) by bolts, and the connecting bracket (15) forms a lifting structure on the inner side of the fixed bracket (6) through a gear (16); The gear (16) is connected to the upper end of the fixed bracket (6) by means of rotation, and the gear (16) has two gears, namely a front gear and a rear gear, and the gear (16) is connected to the connecting bracket (15) by means of meshing; The gear on the rear side is fixedly connected to the connecting handle (17), and the connecting handle (17) is connected to the fixing sleeve (20) by means of a snap fit, and the fixing sleeve (20) forms a flip structure on a side of the movable block (19) away from the vertical central axis of the fixing base (1); The movable block (19) is rotatably connected to the upper end of the fixed bracket (6), and the movable block (19) and the fixed bracket (6) are limited by a fixing bolt (22), and the fixing bolt (22) and the movable block (19) as well as the fixing bolt (22) and the fixed bracket (6) are all threadedly connected; The upper end of the connecting bracket (15) is fixedly connected to the connecting column (26), and the outer surface of the connecting column (26) is sleeved with a movable frame (27) in a frame-shaped structure, and a spring (28) is provided at the connection between the connecting column (26) and the movable frame (27), and the upper end of the connecting column (26) is fixedly connected to a mounting column (29) having a threaded outer surface provided on the upper end; The mounting column (29) is plugged into the upper end of the movable frame (27), and the mounting column (29) is connected to a mounting sleeve (31) for locking by means of a thread, and the mounting sleeve (31) is fitted on the upper surface of the movable frame (27), and the movable frame (27) is snap-fitted to a protrusion (30) at a corresponding position.

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