Welding process and auxiliary tool

Abstract

The invention relates to the field of welding technologies, in particular to a welding process and an auxiliary tooling, the welding process comprises the following steps: material preparation: confirming welding equipment, and confirming a to-be-welded material; the method comprises the steps of material pretreatment, specifically, the connecting parts of materials to be welded are treated, the edges of the materials to be welded are cut or polished to form first groove parts, meanwhile, the first groove parts are polished to have metallic luster, the two materials to be welded are made to be close to each other, and the two first groove parts are made to be arranged oppositely; material welding is conducted, specifically, a welding method is confirmed, then welding is conducted in a gap between the two first groove parts, and a welding bead is formed between the two first groove parts; welding seam treatment: cleaning welding slag generated on the surface of the welding seam, and polishing the welding seam to have metallic luster; and material inspection, wherein appearance inspection is conducted on the welded material, and meanwhile nondestructive testing is conducted. The welding effect between the multiple to-be-welded materials can be improved.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a welding process and auxiliary tooling. Background Art

[0002] Welding, also known as fusion, is a manufacturing process that joins metals or other materials by heating, high temperature or high pressure. In addition to being used in factories, welding can also be performed in a variety of environments, such as outdoors, underwater and in space. Common welding methods include manual arc welding, gas tungsten arc welding, etc.

[0003] When two horizontal metal plates are connected, they are placed on the work surface at the same time and close to each other. Then the workers hold or step on the metal plates to temporarily position them, and then weld the edges of the two metal plates facing each other. After welding, the welding slag is cleaned and the weld is polished.

[0004] However, after welding two metal plates placed horizontally, the weld tends to bulge outward, and grinding the weld will also cause the weld to become thinner, which makes the connection between the two metal plates less stable, and after long-term use, the weld tends to crack. Summary of the invention

[0005] In order to improve the welding effect between several materials to be welded, the present application provides a welding process and auxiliary tooling.

[0006] In a first aspect, the present application provides a welding process, which adopts the following technical solution: A welding process comprises the following steps: Material preparation: confirm welding equipment and materials to be welded; Material pretreatment: Process the connection parts of the materials to be welded, cut or grind the edges of the materials to be welded to form a first groove, and grind the first groove to give it a metallic luster, bring the two materials to be welded close to each other, and set the two first grooves facing each other; Material welding: confirm the welding method, then weld in the gap between the two first groove parts, and form a weld bead between the two first groove parts; Weld seam treatment: clean the welding slag on the weld surface and polish the weld to give it a metallic luster; Material inspection: Carry out visual inspection on the welded materials and perform non-destructive testing at the same time.

[0007] By adopting the above technical solution, after welding is completed and the weld is polished, the weld has a better filling effect on the gap in the first groove part, so that the strength of the weld is higher, the stability of the connection between the materials to be welded is better, the possibility of cracking at the weld is reduced, and the welding effect between several materials to be welded is improved.

[0008] Optionally, in the material welding step, a multi-layer weld is arranged between the two first groove portions.

[0009] By adopting the above technical solution, the multi-layer weld can improve the connection stability between several materials to be welded and increase the strength of the weld.

[0010] Optionally, in the material pretreatment step, a second groove portion is provided on the side of the two materials to be welded that face each other and are away from the first groove portion; in the material welding step, the gap between the two second groove portions is also welded.

[0011] By adopting the above technical solution, the connection of several materials to be welded can be reinforced from different directions, so that the strength of the weld is higher and the welding effect is improved.

[0012] In the second aspect, the present application provides a welding auxiliary tool, which adopts the following technical solution: A welding auxiliary tool comprises a frame and two bearing plates for placing materials to be welded, wherein the two bearing plates are arranged with a gap and are both movably connected to the frame, and the bearing plates are equipped with a clamp for positioning the materials to be welded.

[0013] By adopting the above technical solution, when in use, the two materials to be welded are placed on two supporting plates respectively, and then clamped and fixed by a clamp, so that the first groove portion and the second groove portion on the two materials to be welded are close to each other and located in the gap area between the two supporting plates, and then the first groove portion or the second groove portion can be welded from another direction, so that during the welding process, the materials to be welded have better stability, ensuring the stable progress of the welding operation, while ensuring the welding quality and improving the welding effect.

[0014] Optionally, the two bearing plates are respectively a first bearing plate and a second bearing plate, the first bearing plate is hinged to the frame, and the second bearing plate is connected to the first bearing plate; the frame is provided with a support adjustment rod, and the support adjustment rod is used to support and adjust the angle of the first bearing plate.

[0015] By adopting the above technical solution, the positions of the first supporting plate and the second supporting plate as a whole can be adjusted by the support adjustment rod, thereby facilitating the adjustment of the orientation of the welding part and improving the convenience of welding.

[0016] Optionally, the support adjustment rod includes a first strut, a second strut and an adjusting nut, the first strut is hinged to the frame, the second strut is hinged to the first bearing plate, the second strut is passed through and slidably connected to the first strut, the adjusting nut is rotatably connected to the first strut, and the adjusting nut is sleeved and threadedly connected to the second strut.

[0017] By adopting the above technical solution, rotating the adjusting nut can control the sliding of the first support rod relative to the second support rod, thereby adjusting the overall length of the support adjusting rod, and then adjusting the overall angle of the first supporting plate and the second supporting plate, which is convenient for adjusting the direction of the welding part and facilitating welding.

[0018] Optionally, a rotating shaft is fixed to the first bearing plate, a worm gear is fixed to the second bearing plate, the worm gear is sleeved and rotatably connected to the rotating shaft, the first bearing plate is rotatably connected to an adjusting worm, and the adjusting worm is meshed with the worm gear.

[0019] By adopting the above technical solution, rotating the adjusting worm can drive the worm wheel to rotate, and then control the second supporting plate to rotate relative to the first supporting plate, so as to adjust the angle between the first supporting plate and the second supporting plate, so as to facilitate welding of two materials to be welded with different angles.

[0020] Optionally, a positioning hole is provided at one end of the rotating portion of the second bearing plate away from the worm gear, a plurality of mounting rods are fixed to the first bearing plate, a movable block is sleeved and slidably connected to the mounting rods, a gear head is formed on the movable block, the rotation axis of the second bearing plate is colinear with the axis of the gear head, the gear head is plugged into the positioning hole, a clamping screw is passed through and threadedly connected to the movable block, and the clamping screw is clamped against the mounting rod.

[0021] By adopting the above technical solution, after the second supporting plate is adjusted, the movable block can be slid so that the gear head can be plugged into the positioning hole, and then the tightening screw is tightened, so that the rotation of the second supporting plate can be locked from the other end of the rotating part of the second supporting plate, thereby enhancing the stability of the second supporting plate during use.

[0022] Optionally, the mounting rod is provided with a traction spring for pulling the movable block to automatically slide toward the positioning hole, and the inner wall of the positioning hole is formed with an avoidance curved surface, and the avoidance curved surface is used to push the gear head to automatically detach from the positioning hole.

[0023] By adopting the above technical solution, during the rotation of the second bearing plate, the avoidance curved surface on the inner wall of the positioning hole will gradually push the gear head out of the positioning hole, and under the action of the traction spring, the gear head will automatically match the positioning hole again. After the second bearing plate is adjusted and the gear head is in the position to match the positioning hole, it is only necessary to rotate the tightening screw to lock the movable block, thereby making the adjustment process of the second bearing plate more convenient.

[0024] Optionally, the movable block is provided with an elongated mounting hole, which extends along the sliding direction of the movable block; a light-transmitting sheet is fixed to the inner wall of the mounting hole, and the light-transmitting sheet is provided with parts of two different colors; an indicator light for illuminating the light-transmitting sheet is embedded inside the mounting rod; when the gear head is plugged into the positioning hole, the indicator light illuminates the part of one color on the light-transmitting sheet, and when the gear head is detached from the positioning hole, the indicator light illuminates the part of another color on the light-transmitting sheet.

[0025] By adopting the above technical solution, in the process of adjusting the rotation angle of the second supporting plate, the indicator light can alternately illuminate the two parts of different colors on the light-transmitting sheet, thereby realizing the alternating switching of different lights, so that the staff can know the position of the movable block in time, and whether the gear head is matched with the positioning hole after the second supporting plate is adjusted. Then, it is only necessary to tighten the tightening screw, thereby improving the convenience of the adjustment process of the second supporting plate.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. After welding is completed and the weld is polished, the weld has a better filling effect on the gap in the first groove, making the weld stronger, reducing the possibility of cracking at the weld, and improving the welding effect between several materials to be welded; 2. It can reinforce the connection of several materials to be welded from different directions, making the weld stronger and improving the welding effect; 3. When in use, place the two materials to be welded on the two supporting plates respectively, and then clamp and fix them by means of a clamp, and then weld the first groove part or the second groove part from another direction, so that the materials to be welded have better stability during the welding process, ensuring the stability of the welding operation, while ensuring the welding quality and improving the welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of a welding process according to an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of a weld in a welding process in an embodiment of the present application; Figure 3 This is a structural schematic diagram of a welding auxiliary tooling according to an embodiment of the present application; Figure 4 yes Figure 3 A schematic diagram of the enlarged structure of part A; Figure 5 It is a partial cross-sectional structural schematic diagram of a welding auxiliary tooling in an embodiment of the present application; Figure 6 yes Figure 5 A schematic diagram of the enlarged structure of part B; Figure 7 yes Figure 5 A schematic diagram of the enlarged structure of the middle C part; Figure 8 This is a schematic diagram of the installation structure of a light-transmitting sheet in a welding auxiliary tooling in an embodiment of the present application; Fig. 9 It is a schematic diagram of the partial cross-sectional structure of a movable block in a welding auxiliary tooling according to an embodiment of the present application.

[0028] Explanation of the reference numerals in the accompanying drawings: 1. material to be welded; 11. first groove portion; 12. second groove portion; 2. weld bead; 3. frame; 4. first bearing plate; 41. rotating shaft; 42. adjusting worm; 43. mounting rod; 5. second bearing plate; 51. worm wheel; 52. positioning hole; 53. movable block; 531. gear head; 532. tightening screw; 533. mounting hole; 54. traction spring; 55. avoidance surface; 6. clamp; 7. support and adjustment rod; 71. first support rod; 72. second support rod; 73. adjusting nut; 8. indicator light; 9. light-transmitting sheet. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-9 This application is described in further detail.

[0030] The present application embodiment discloses a welding process. Figure 1 and Figure 2 , a welding process comprises the following steps: Material preparation: confirm the welding equipment and the material 1 to be welded. In this embodiment, the plurality of materials 1 to be welded are set as two metal plates, but they can also be other materials.

[0031] Material pretreatment: The connection part of the material to be welded 1 is processed, and the edges of the two metal plates are cut or polished to form a first groove portion 11 and a second groove portion 12. The first groove portion 11 and the second groove portion 12 are located on the same edge of the metal plate, and the first groove portion 11 and the second groove portion 12 are arranged opposite to each other. The first groove portion 11 and the second groove portion 12 are polished to have a metallic luster, and the two metal plates are brought close to each other, and the two first groove portions 11 are arranged opposite to each other, and the two second groove portions 12 are arranged opposite to each other.

[0032] Material welding: The welding method is confirmed, and then welding is performed in the gap between the two first groove portions 11 to form a multi-layer weld bead 2 between the two first groove portions 11; secondly, welding is performed in the gap between the second groove portions 12 to also form a weld bead 2.

[0033] Weld seam treatment: Clean the welding slag on the weld surface and polish the weld to give it a metallic luster.

[0034] Material inspection: Carry out visual inspection on the welded materials and perform non-destructive testing at the same time.

[0035] The implementation principle of a welding process in an embodiment of the present application is as follows: after welding is completed and the weld is polished, multiple layers of weld beads 2 are still retained in the gap of the first groove portion 11, and there are also weld beads 2 in the gap of the second groove portion 12, so that the connection between the two metal plates can be reinforced from different directions, so that the strength of the weld is higher, the stability of the connection between the two metal plates is better, the possibility of cracking at the weld is reduced, and the welding effect between the several materials 1 to be welded is improved.

[0036] The present application also discloses a welding auxiliary tool. Figure 3 A welding auxiliary tooling includes a frame 3 and two bearing plates, the two bearing plates are respectively set as a first bearing plate 4 and a second bearing plate 5. The first bearing plate 4 is connected to a connecting rod, which is hinged to the frame 3; the second bearing plate 5 is also connected to a connecting rod, and the connecting rod is connected to the first bearing plate 4, and a gap is set between the facing ends of the first bearing plate 4 and the second bearing plate 5. The bearing plate is provided with a clamp 6, and the clamp 6 is set as a clamping screw. At this time, the first bearing plate 4 and the second bearing plate 5 are both provided with a plurality of threaded holes that can cooperate with the clamping screws.

[0037] Reference Figure 3 The frame 3 is provided with a support adjustment rod 7, one end of the support adjustment rod 7 is connected to the frame 3, and the other end is connected to the first bearing plate 4. The support adjustment rod 7 can support the first bearing plate 4 and adjust the deflection angle of the first bearing plate 4 at the same time.

[0038] When in use, two materials 1 to be welded (i.e., two metal plates) are placed on the first carrier plate 4 and the second carrier plate 5 respectively, and then the metal plates are clamped and fixed by the clamp 6. The first groove portions 11 and the second groove portions 12 on the two metal plates are close to each other and located in the gap area between the first carrier plate 4 and the second carrier plate 5, and then the first groove portion 11 or the second groove portion 12 is welded from another direction. During the welding process, the metal plates have better stability, ensuring the stable progress of the welding operation and the welding quality.

[0039] Furthermore, the positions of the first supporting plate 4 and the second supporting plate 5 as a whole can be adjusted by supporting the adjusting rod 7, so as to facilitate the adjustment of the orientation of the welding part and improve the convenience of welding.

[0040] Reference Figure 3 and Figure 4The support adjustment rod 7 includes a first support rod 71, a second support rod 72 and an adjustment nut 73. One end of the first support rod 71 is hinged to the frame 3, one end of the second support rod 72 is hinged to the first bearing plate 4, and the other end of the second support rod 72 is coaxially penetrated and slidably connected to the first support rod 71. The adjustment nut 73 is coaxially rotatably connected to the first support rod 71, and the adjustment nut 73 is sleeved and threadedly connected to the second support rod 72.

[0041] Rotating the adjusting nut 73 can control the first support rod 71 to slide relative to the second support rod 72, thereby adjusting the overall length of the support adjusting rod 7, and further adjusting the overall angle of the first supporting plate 4 and the second supporting plate 5, so as to facilitate the adjustment of the direction of the metal plate welding part and facilitate welding.

[0042] In other embodiments, the adjusting nut 73 in the support adjusting rod 7 can also be replaced with a locking bolt, and the locking bolt is simultaneously passed through the first support rod 71 and the second support rod 72. At this time, the first support rod 71 or the second support rod 72 is provided with a plurality of adjustment holes for the locking bolt to pass through, and the plurality of adjustment holes are distributed along the length direction of the first support rod 71.

[0043] Reference Figure 5 and Figure 6 At the same time, the second carrier plate 5 is hinged to the first carrier plate 4. Specifically, a horizontally extending rotating shaft 41 is fixed to one end of the rotating portion of the first carrier plate 4, and a worm gear 51 is fixed to the second carrier plate 5. The worm gear 51 is sleeved and rotatably connected to the rotating shaft 41. The first carrier plate 4 is rotatably connected to an adjusting worm 42, which is meshed with the worm gear 51.

[0044] Reference Figure 7 A positioning hole 52 is provided at one end of the rotating part of the second supporting plate 5 away from the rotating shaft 41, and the axis of the positioning hole 52 is in the same straight line with the rotating axis of the second supporting plate 5, and the inner wall of the positioning hole 52 is provided with an inner gear ring structure. A plurality of mounting rods 43 are fixed to one end of the rotating part of the first supporting plate 4 away from the rotating shaft 41, and the mounting rods 43 extend parallel to the rotating axis of the first supporting plate 4. The first supporting plate 4 is provided with a movable block 53, and the movable block 53 is sleeved and slidably connected to the plurality of mounting rods 43. The movable block 53 is formed with a gear head 531, and the gear head 531 is plugged into the positioning hole 52. A tightening screw 532 is passed through and threadedly connected to the movable block 53, and the tightening screw 532 is tightened against the mounting rod 43.

[0045] Reference Figure 7 The mounting rod 43 is provided with a traction spring 54, and the two ends of the traction spring 54 are respectively connected to the mounting rod 43 and the movable block 53. The traction spring 54 can make the movable block 53 have a tendency to slide toward the positioning hole 52. The inner wall of the positioning hole 52 is formed with an avoidance curved surface 55, and the end of the gear head 531 facing the positioning hole 52 is a frustum-shaped structure.

[0046] Rotating the adjustment worm 42 can drive the worm wheel 51 to rotate, and then can control the second bearing plate 5 to rotate relative to the first bearing plate 4, so as to adjust the angle between the first bearing plate 4 and the second bearing plate 5, so as to adapt to the welding of two metal plates with different angles. In addition, during the rotation of the second bearing plate 5, the avoidance curved surface 55 on the inner wall of the positioning hole 52 will gradually push the gear head 531 out of the positioning hole 52, and under the action of the traction spring 54, the gear head 531 will be matched with the positioning hole 52 again. When the second bearing plate 5 is adjusted and the gear head 531 is in a position to match the positioning hole 52, it is only necessary to rotate the tightening screw 532 to lock the movable block 53. Thereby, the movable block 53 has a further limiting effect on the rotation of the second bearing plate 5, improves the stability during use, and the operation process is more convenient.

[0047] Reference Figure 8 and Fig. 9 The movable block 53 is provided with a mounting hole 533, which is in a long strip structure and extends along the sliding direction of the movable block 53. A light-transmitting sheet 9 is fixed to the inner wall of the mounting hole 533, and the light-transmitting sheet 9 has two parts of different colors, such as red at one end and green at the other end. An indicator light 8 is embedded inside the mounting rod 43. When the gear head 531 is inserted into the positioning hole 52, the indicator light 8 illuminates the green part of the light-transmitting sheet 9; when the gear head 531 is separated from the positioning hole 52, the indicator light 8 illuminates the red part of the light-transmitting sheet 9.

[0048] Therefore, when the adjusting worm 42 is rotated to adjust the rotation angle of the second bearing plate 5, the indicator light 8 can alternately illuminate the red and green parts of the light-transmitting sheet 9, realizing the alternate switching of red light and green light. This makes it easy for the staff to know the position of the movable block 53 in time, and to know whether the gear head 531 is matched with the positioning hole 52 after the second bearing plate 5 is adjusted. Then, it is only necessary to tighten the abutting screw 532, thereby improving the convenience of the adjustment process of the second bearing plate 5.

[0049] The implementation principle of a welding auxiliary tooling in an embodiment of the present application is as follows: when in use, the two metal plates in the material to be welded 1 are placed on the first carrier plate 4 and the second carrier plate 5 respectively, so that the first groove portion 11 and the second groove portion 12 on the two metal plates are close to each other and located in the gap area between the first carrier plate 4 and the second carrier plate 5, and then the metal plates are clamped and fixed by the clamp 6. Then the first groove portion 11 or the second groove portion 12 can be welded from another direction. In this way, the metal plate has better stability during welding, ensuring the stable progress of the welding operation and the welding quality. In addition, during the welding process, the angle between the two metal plates and the direction of the welding part can also be adjusted to improve the convenience of welding.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A welding process, characterized in that: The following steps are involved: Material preparation: confirm welding equipment and materials to be welded (1); Material pretreatment: treating the connection part of the material to be welded (1), cutting or grinding the edge of the material to be welded (1) to form a first groove portion (11), and grinding the first groove portion (11) to give it a metallic luster, bringing the two materials to be welded (1) closer to each other, and arranging the two first groove portions (11) to face each other; Material welding: confirming the welding method, and then welding in the gap between the two first groove parts (11), so that a weld bead (2) is formed between the two first groove parts (11); The welding process is carried out on a welding auxiliary tooling, which comprises a frame (3) and two bearing plates for placing the material to be welded (1), the two bearing plates are arranged with a gap and are both movably connected to the frame (3), and the bearing plates are equipped with a fixture (6) for positioning the material to be welded (1); The two bearing plates are respectively a first bearing plate (4) and a second bearing plate (5); the first bearing plate (4) is hinged to the frame (3), and the second bearing plate (5) is connected to the first bearing plate (4); the frame (3) is provided with a support adjustment rod (7), and the support adjustment rod (7) is used to support and adjust the angle of the first bearing plate (4); The first bearing plate (4) is fixed with a rotating shaft (41), the second bearing plate (5) is fixed with a worm wheel (51), the worm wheel (51) is sleeved and rotatably connected to the rotating shaft (41), the first bearing plate (4) is rotatably connected with an adjusting worm (42), and the adjusting worm (42) is meshed with the worm wheel (51); A positioning hole (52) is provided at one end of the rotating portion of the second bearing plate (5) away from the worm gear (51); a plurality of mounting rods (43) are fixed to the first bearing plate (4); a movable block (53) is sleeved on and slidably connected to the mounting rods (43); a gear head (531) is formed on the movable block (53); a rotation axis of the second bearing plate (5) is colinear with an axis of the gear head (531); the gear head (531) is plugged into the positioning hole (52); a tightening screw (532) is passed through and threadedly connected to the movable block (53); the tightening screw (532) is tightened against the mounting rod (43); Weld seam treatment: clean the welding slag on the weld surface and polish the weld to give it a metallic luster; Material inspection: Carry out visual inspection on the welded materials and perform non-destructive testing at the same time.

2. A welding process according to claim 1, characterized in that: In the material welding step, a multi-layer weld (2) is arranged between two first groove portions (11).

3. A welding process according to claim 1, characterized in that: In the material pretreatment step, a second groove portion (12) is provided on the side of the two materials (1) to be welded that face each other and are away from the first groove portion (11); in the material welding step, the gap between the two second groove portions (12) is also welded.

4. A welding auxiliary tool, characterized in that: It comprises a frame (3) and two bearing plates for placing the material to be welded (1), the two bearing plates are arranged with a gap and are both movably connected to the frame (3), and the bearing plates are provided with a fixture (6) for positioning the material to be welded (1); The two bearing plates are respectively a first bearing plate (4) and a second bearing plate (5); the first bearing plate (4) is hinged to the frame (3), and the second bearing plate (5) is connected to the first bearing plate (4); the frame (3) is provided with a support adjustment rod (7), and the support adjustment rod (7) is used to support and adjust the angle of the first bearing plate (4); The first bearing plate (4) is fixed with a rotating shaft (41), the second bearing plate (5) is fixed with a worm wheel (51), the worm wheel (51) is sleeved and rotatably connected to the rotating shaft (41), the first bearing plate (4) is rotatably connected with an adjusting worm (42), and the adjusting worm (42) is meshed with the worm wheel (51); A positioning hole (52) is provided at one end of the rotating portion of the second bearing plate (5) away from the worm gear (51); a plurality of mounting rods (43) are fixed to the first bearing plate (4); a movable block (53) is sleeved on and slidably connected to the mounting rods (43); a gear head (531) is formed on the movable block (53); the rotation axis of the second bearing plate (5) is colinear with the axis of the gear head (531); the gear head (531) is plugged into the positioning hole (52); a tightening screw (532) is passed through and threadedly connected to the movable block (53); the tightening screw (532) is tightened against the mounting rod (43).

5. A welding auxiliary tool according to claim 4, characterized in that: The support adjustment rod (7) comprises a first support rod (71), a second support rod (72) and an adjustment nut (73); the first support rod (71) is hinged to the frame (3); the second support rod (72) is hinged to the first bearing plate (4); the second support rod (72) is inserted through and slidably connected to the first support rod (71); the adjustment nut (73) is rotatably connected to the first support rod (71); and the adjustment nut (73) is sleeved and threadedly connected to the second support rod (72).

6. A welding auxiliary tool according to claim 4, characterized in that: The mounting rod (43) is provided with a traction spring (54) for traction of the movable block (53) to automatically slide toward the positioning hole (52); an escape curved surface (55) is formed on the inner wall of the positioning hole (52); the escape curved surface (55) is used to push the gear head (531) to automatically escape from the positioning hole (52).

7. A welding auxiliary tool according to claim 6, characterized in that: The movable block (53) is provided with a long strip-shaped mounting hole (533), the mounting hole (533) extending along the sliding direction of the movable block (53), a light-transmitting sheet (9) being fixed to the inner wall of the mounting hole (533), the light-transmitting sheet (9) being provided with two portions of different colors; an indicator light (8) for illuminating the light-transmitting sheet (9) is embedded inside the mounting rod (43); when the gear head (531) is plugged into the positioning hole (52), the indicator light (8) illuminates the portion of one color on the light-transmitting sheet (9), and when the gear head (531) is detached from the positioning hole (52), the indicator light (8) illuminates the portion of the other color on the light-transmitting sheet (9).

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