Valve flange semi-automatic electric arc welding fixing device

Abstract

The application discloses a valve flange semi-automatic electric arc welding fixing device and relates to the technical field of semi-automatic electric arc welding. The valve flange semi-automatic electric arc welding fixing device comprises a bottom plate, the top of the bottom plate is connected with two symmetrically arranged moving plates through a first moving mechanism, the opposite side walls of the two first moving plates are connected with two symmetrically arranged first V-shaped plates through a second moving mechanism, and the side walls of each first V-shaped plate are fixedly connected with two symmetrically arranged first fixing blocks. The valve flange semi-automatic electric arc welding fixing device is convenient for centrally clamping, limiting and aligning the end faces of the valve and the flange, is more convenient and fast to use, and guarantees the quality of subsequent welding. The valve flange semi-automatic electric arc welding fixing device is convenient for cleaning the weld between the valve and the flange, is convenient for detecting the size of the weld between the valve and the flange, and guarantees the quality of subsequent welding after determining whether the size of the weld is within the required range.

Description

Technical Field

[0001] This invention relates to the field of semi-automatic arc welding technology, specifically to a semi-automatic arc welding fixing device for valve flanges. Background Technology

[0002] Valves can be manufactured using intelligent manufacturing equipment, and with the development of the manufacturing industry, this manufacturing method is gradually becoming a trend. It is of great significance to the innovation of the valve industry, and can improve the efficiency and quality of valve manufacturing. In the manufacturing process, valves and flanges need to be welded by semi-automatic electric arc welding. During welding, fixing devices are needed to fix the valves and flanges.

[0003] However, existing semi-automatic arc welding and fixing devices for valves and flanges are not convenient for centering and clamping the valves and flanges and ensuring their end faces are flush during use, which affects the fixing effect and thus the quality of subsequent welding. At the same time, it is not convenient to clean the weld seams of valves and flanges, which also affects the quality of subsequent welding. Furthermore, it is not convenient to inspect the size of the weld seams of valves and flanges, as seams that are too large or too small will also affect the quality of subsequent welding. Summary of the Invention

[0004] The purpose of this invention is to provide a semi-automatic arc welding and fixing device for valve flanges to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a semi-automatic arc welding fixing device for valve flanges, comprising a base plate, the top of which is connected to two symmetrically arranged movable plates via a first movable mechanism, and the opposite sidewalls of the two first movable plates are connected to two symmetrically arranged first V-shaped plates via a second movable mechanism. Two sets of symmetrically arranged first fixing blocks are fixedly connected to the sidewalls of each first V-shaped plate, and a first motor is fixedly connected to the sidewalls of each set of first fixing blocks. A V-shaped first roller is fixedly connected to the output end of the first motor, and the opposite sidewalls of the two movable plates... Two sets of symmetrically arranged second V-shaped plates are connected via a third moving mechanism. Each set of second V-shaped plates has two pairs of second fixing blocks fixedly connected to its side wall. Each set of second fixing blocks has a second motor fixedly connected to its side wall. The output end of the second motor is fixedly connected to a second roller. A baffle is fixedly connected to the side wall of one of the first V-shaped plates. A pushing mechanism for pushing the valve is provided on the top of the base plate. A cleaning mechanism for cleaning the weld is provided on the side wall of one of the second V-shaped plates. A detection mechanism for detecting the size of the weld is provided on the cleaning mechanism.

[0006] Preferably, the pushing mechanism includes a first fixed plate fixedly connected to the top of the base plate, and two symmetrically arranged sleeve rods are fixedly connected to the side wall of the first fixed plate. Each sleeve rod has a sleeve sleeved on its side wall. The other end of each sleeve sleeve is fixedly connected to a pushing plate, and each sleeve sleeve has a first spring sleeved on its side wall. The movement of the pushing plate is driven by a pushing assembly.

[0007] Preferably, the pushing assembly includes a support block fixedly connected to the side wall of the first V-shaped plate, and two symmetrically arranged T-shaped guide rods are inserted into the top of the support block. A moving rod is fixedly connected to the lower end of each T-shaped guide rod, and a first pushing block is fixedly connected to the bottom of the moving rod. The side wall of the first pushing block has an inclined groove. A first pushing pin is fixedly connected to the side wall of the pushing plate and is inserted into the inclined groove. A second spring is sleeved on the side wall of each T-shaped guide rod. A second pushing block is fixedly connected to the side wall of the second V-shaped plate, and the second pushing block includes an inclined surface.

[0008] Preferably, the cleaning mechanism includes a connecting frame fixedly connected to the side wall of the second V-shaped plate, and two symmetrically arranged connecting rods are fixedly connected to the side wall of the connecting frame. The other end of the connecting rod is fixedly connected to a mounting block, and a brush is fixedly connected to the side wall of the mounting block.

[0009] Preferably, the detection mechanism includes a sliding rod inserted into the side wall of the mounting block, one end of which is fixedly connected to a tapered rod; an arc-shaped scale plate is fixedly connected to the side wall of the mounting block; a vision sensor is fixedly connected to the side wall of the mounting block; a pointer is rotatably connected to the side wall of the mounting block via a rotating mechanism; and a reset mechanism is provided between the sliding rod and the mounting block.

[0010] Preferably, the rotating mechanism includes a connecting block fixedly connected to the side wall of the mounting block, and a rotating shaft is rotatably connected to the bottom of the connecting block. The pointer is fixed to the lower end of the rotating shaft, and a sliding groove is provided at the top of the pointer. A second push pin is fixedly connected to the top of the sliding rod, and the second push pin is inserted into the sliding groove.

[0011] Preferably, the reset mechanism includes a fixing ring fixedly sleeved on the side wall of the sliding rod, and a third spring is sleeved on the side wall of the sliding rod.

[0012] Preferably, the moving mechanism includes two symmetrically arranged second fixing plates fixedly connected to the top of the base plate, and guide rods fixedly connected to the opposite side walls of the two second fixing plates. The moving plate is sleeved on the side wall of the guide rod, and a double-ended lead screw is rotatably connected to the opposite side walls of the two second fixing plates. The moving plate is threadedly connected to the side wall of the double-ended lead screw. A third motor is fixedly connected to the side wall of the second fixing plate, and the output end of the third motor is fixed to one end of the double-ended lead screw.

[0013] Preferably, the second moving mechanism includes two symmetrically arranged first fixing rods fixedly connected to the opposite sidewalls of the two second fixing plates, and the moving plate is sleeved on the sidewall of the first fixing rod. The sidewall of the first fixing rod is sleeved with two symmetrically arranged first L-shaped plates. The top of the first V-shaped plate is fixed to the first L-shaped plate, and the sidewall of each first fixing rod is sleeved with two symmetrically arranged fourth springs.

[0014] Preferably, the third moving mechanism includes two symmetrically arranged second fixing rods fixedly connected to the opposite sidewalls of the two second fixing plates, and the moving plate is sleeved on the sidewall of the second fixing rod. The sidewall of the second fixing rod is sleeved with two symmetrically arranged second L-shaped plates. The second V-shaped plate is fixed to the top of the second L-shaped plate, and the sidewall of each second fixing rod is sleeved with a fifth spring.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This semi-automatic arc welding and fixing device for valves and flanges, through the setting of a pushing mechanism, a cleaning mechanism, and a detection mechanism, facilitates the centering, clamping, and limiting of valves and flanges, as well as the alignment of their end faces. It is more convenient and faster to use and ensures the quality of subsequent welding. It also facilitates the cleaning of the weld between the valve and flange and the detection of the size of the weld between the valve and flange. After determining whether the size of the weld is within the required range, it ensures the quality of subsequent welding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure from another perspective of the present invention;

[0019] Figure 3 for Figure 1 Enlarged structural diagram at point A;

[0020] Figure 4 for Figure 2 Enlarged structural diagram at point B;

[0021] Figure 5 for Figure 3 Enlarged structural diagram at point C;

[0022] Figure 6 for Figure 4 Enlarged structural diagram at point D;

[0023] Figure 7 for Figure 6 A magnified structural diagram at point E in the middle.

[0024] In the diagram: 1. Base plate; 201. Connecting frame; 202. Connecting rod; 203. Mounting block; 204. Brush; 301. Sliding rod; 302. Tapered rod; 303. Scale plate; 304. Vision sensor; 305. Pointer; 401. Fixing ring; 402. Third spring; 501. Connecting block; 502. Rotating shaft; 503. Slide groove; 504. Second push pin; 601. First fixing plate; 602. Push plate; 603. Sleeve rod; 604. Sleeve; 605. First spring; 701. Support block; 702. T-shaped guide rod; 703. Moving rod; 704. Second spring; 705. First push block 706. Inclined groove; 707. First push pin; 708. Second push block; 709. Inclined surface; 801. Second fixing plate; 802. Guide rod; 803. Third motor; 804. Double-ended lead screw; 901. First fixing rod; 902. First L-shaped plate; 903. Fourth spring; 1001. Second fixing rod; 1002. Second L-shaped plate; 1003. Fifth spring; 11. Moving plate; 12. First V-shaped plate; 13. First fixing block; 14. First motor; 15. First roller; 16. Second V-shaped plate; 17. Second fixing block; 18. Second motor; 19. Second roller; 20. Baffle. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-7This invention provides a semi-automatic arc welding fixing device for valve flanges, comprising a base plate 1. The top of the base plate 1 is connected to two symmetrically arranged movable plates 11 via a first movable mechanism. The opposing sidewalls of the two first movable plates 11 are connected to two symmetrically arranged first V-shaped plates 12 via a second movable mechanism. Each first V-shaped plate 12 has two sets of symmetrically arranged first fixing blocks 13 fixedly connected to its sidewall. Each set of first fixing blocks 13 has a first motor 14 fixedly connected to its sidewall. The output end of the first motor 14 is fixedly connected to a V-shaped first roller 15. The opposing sidewalls of the two movable plates 11 are connected to two sets of symmetrically arranged second V-shaped plates 16 via a third movable mechanism. Each set of second V-shaped plates 16 has two pairs of second fixing blocks 17 fixedly connected to its sidewall. A second motor 18 is fixedly connected to the side wall of the second fixed block 17. A second roller 19 is fixedly connected to the output end of the second motor 18. A baffle 20 is fixedly connected to the side wall of one of the first V-shaped plates 12. A pushing mechanism for pushing the valve is provided on the top of the base plate 1. A cleaning mechanism for cleaning the weld is provided on the side wall of one of the second V-shaped plates 16. A detection mechanism for detecting the size of the weld is provided on the cleaning mechanism. This facilitates the centering, clamping, and limiting of the valve and flange, as well as the alignment of the end faces. This makes the operation more convenient and faster, and ensures the quality of subsequent welding. It also facilitates the cleaning of the weld between the valve and the flange, and facilitates the detection of the size of the weld between the valve and the flange. After determining whether the size of the weld is within the required range, the quality of subsequent welding is ensured.

[0027] Please see Figure 2 The pushing mechanism includes a first fixed plate 601 fixedly connected to the top of the base plate 1, and two symmetrically arranged sleeve rods 603 are fixedly connected to the side wall of the first fixed plate 601. Each sleeve rod 603 has a sleeve 604 sleeved on its side wall. The other end of the sleeve 604 is fixedly connected to a pushing plate 602, and each sleeve 604 has a first spring 605 sleeved on its side wall. The movement of the pushing plate 602 is driven by the pushing assembly. When the valve is centered and clamped to a limit, the pushing assembly pushes the pushing plate 602 to move, pushing the valve end to abut against the side wall of the baffle 20, ensuring that the valve and flange end faces are flush.

[0028] Please see Figure 2 and Figure 4The pushing assembly includes a support block 701 fixedly connected to the side wall of the first V-shaped plate 12, and two symmetrically arranged T-shaped guide rods 702 inserted into the top of the support block 701. A moving rod 703 is fixedly connected to the lower end of each T-shaped guide rod 702, and a first pushing block 705 is fixedly connected to the bottom of the moving rod 703. A groove 706 is formed on the side wall of the first pushing block 705. A first pushing pin 707 is fixedly connected to the side wall of the pushing plate 602 and is inserted into the groove 706. A second spring 704 is sleeved on the side wall of each T-shaped guide rod 702. A second pushing block 708 is fixedly connected to the side wall of the second V-shaped plate 16. The moving block 708 includes an inclined surface 709. When the moving plate 11 continues to move, it can push the second L-shaped plate 1002 and the second V-shaped plate 16 to continue moving through the fifth spring 1003, so that the second roller 19 contacts the side wall of one end of the valve. At this time, it can drive the second pushing block 708 to move, so that the moving rod 703 gradually disengages from the inclined surface 709, and the moving rod 703 can move downward under the action of the second spring 704. When the moving rod 703 moves downward, it can drive the first pushing block 705 to move downward. At the same time, the first pushing pin 707 can move upward along the inclined groove 706, thereby pushing the pushing plate 602 to move.

[0029] Please see Figure 6 The cleaning mechanism includes a connecting frame 201 fixedly connected to the side wall of the second V-shaped plate 16, and two symmetrically arranged connecting rods 202 fixedly connected to the side wall of the connecting frame 201. The other end of the connecting rod 202 is fixedly connected to a mounting block 203, and a brush 204 is fixedly connected to the side wall of the mounting block 203. After the valve and flange are clamped and limited, the first motor 14 is started. The rotation of the first motor 14 drives the rotation of the first roller 15, thereby driving the rotation of the flange. The second motor 18 is started. The rotation of the second motor 18 drives the rotation of the second roller 19, thereby driving the rotation of the valve. At this time, the brush 204 can clean the weld between the valve and the flange to ensure the quality of subsequent welding.

[0030] Please see Figure 6 and Figure 7The detection mechanism includes a sliding rod 301 inserted into the side wall of the mounting block 203, with a tapered rod 302 fixedly connected to one end of the sliding rod 301. An arc-shaped scale plate 303 is fixedly connected to the side wall of the mounting block 203, and a vision sensor 304 is fixedly connected to the side wall of the mounting block 203. A pointer 305 is rotatably connected to the side wall of the mounting block 203 via a rotating mechanism. A reset mechanism is provided between the sliding rod 301 and the mounting block 203. After the valve and flange are clamped and limited, the tapered rod 302 abuts against the weld. When the weld is too large or too small, the tapered rod 302 and the sliding rod 301 will move under the action of the reset mechanism. When the sliding rod 301 moves, the pointer 305 can be rotated through the rotating mechanism. At this time, the vision sensor 304 can detect the scale on the scale plate 303 indicated by the pointer 305, thereby determining whether the size of the weld is within the required range and ensuring the quality of subsequent welding.

[0031] Please see Figure 7 The rotating mechanism includes a connecting block 501 fixedly connected to the side wall of the mounting block 203, and a rotating shaft 502 rotatably connected to the bottom of the connecting block 501. The pointer 305 is fixed to the lower end of the rotating shaft 502. A sliding groove 503 is provided on the top of the pointer 305. A second push pin 504 is fixedly connected to the top of the sliding rod 301, and the second push pin 504 is inserted into the sliding groove 503. When the sliding rod 301 moves, it can drive the second push pin 504 to slide in the sliding groove 503, thereby pushing the pointer 305 to rotate along the rotating shaft 502.

[0032] Please see Figure 6 The reset mechanism includes a fixed ring 401 fixedly sleeved on the side wall of the sliding rod 301, and a third spring 402 sleeved on the side wall of the sliding rod 301, which guides and resets the movement of the sliding rod 301.

[0033] Please see Figure 3 The moving mechanism includes two symmetrically arranged second fixed plates 801 fixedly connected to the top of the base plate 1, and guide rods 802 fixedly connected to the opposite side walls of the two second fixed plates 801. The moving plate 11 is sleeved on the side wall of the guide rods 802, and a double-ended lead screw 804 is rotatably connected to the opposite side walls of the two second fixed plates 801. The moving plate 11 is threadedly connected to the side wall of the double-ended lead screw 804. A third motor 803 is fixedly connected to the side wall of the second fixed plates 801, and the output end of the third motor 803 is fixed to one end of the double-ended lead screw 804. When the third motor 803 is started, the rotation of the third motor 803 drives the rotation of the double-ended lead screw 804, thereby driving the two moving plates 11 to move closer to each other.

[0034] Please see Figure 3The second moving mechanism includes two symmetrically arranged first fixing rods 901 fixedly connected to the opposite sidewalls of two second fixing plates 801. The moving plate 11 is sleeved on the sidewall of the first fixing rod 901. The sidewall of the first fixing rod 901 is sleeved with two symmetrically arranged first L-shaped plates 902. The first V-shaped plate 12 is fixed to the top of the first L-shaped plate 902. The sidewall of each first fixing rod 901 is sleeved with two symmetrically arranged fourth springs 903. When the two moving plates 11 move closer to each other, the fourth springs 903 can drive the two first L-shaped plates 902 to move closer to each other, thereby driving the two first V-shaped plates 12 to move closer to each other.

[0035] Please see Figure 3 The third moving mechanism includes two symmetrically arranged second fixing rods 1001 fixedly connected to the opposite side walls of two second fixing plates 801, and a moving plate 11 sleeved on the side wall of the second fixing rod 1001. Two symmetrically arranged second L-shaped plates 1002 are sleeved on the side wall of the second fixing rod 1001. A second V-shaped plate 16 is fixed to the top of the second L-shaped plate 1002, and a fifth spring 1003 is sleeved on the side wall of each second fixing rod 1001. When the two moving plates 11 move closer to each other, the second L-shaped plate 1002 and the second V-shaped plate 16 can be pushed to continue moving by the fifth spring 1003.

[0036] Working principle: In use, when semi-automatic arc welding of valves and flanges is required, the flange is placed between the two first V-shaped plates 12 and between the first rollers 15, and one end of the valve is placed between the two second V-shaped plates 16. Then, the third motor 803 is started. The rotation of the third motor 803 drives the rotation of the double-ended lead screw 804, thereby driving the two moving plates 11 to move closer to each other. At the same time, the fourth spring 903 can drive the two first L-shaped plates 902 to move closer to each other, thereby driving the two first V-shaped plates 12 to move closer to each other. Meanwhile, when the two moving plates 11 move closer to each other, the fifth spring 1003 can drive the two second L-shaped plates 1002 to move closer to each other, thereby driving the two second V-shaped plates 16 to move closer to each other. When the first roller 15 abuts against the side wall of the flange, it can center and limit its movement. At the same time, the fourth spring 903 is gradually compressed.

[0037] When the moving plate 11 continues to move, the fifth spring 1003 pushes the second L-shaped plate 1002 and the second V-shaped plate 16 to continue moving, so that the second roller 19 contacts the side wall of one end of the valve. At this time, the second pushing block 708 can be driven to move, so that the moving rod 703 gradually disengages from the inclined surface 709, and the moving rod 703 can move downward under the action of the second spring 704. When the moving rod 703 moves downward, it can drive the first pushing block 705 to move downward. At the same time, the first pushing pin 707 can move upward along the inclined groove 706, thereby pushing the pushing plate 602 to move. At the same time, the first spring 605 is compressed, thereby pushing one end of the valve to abut against the side wall of the baffle 20, ensuring that the end faces of the valve and the flange are flush. When the moving plate 11 continues to move, the fifth spring 1003 is compressed, thereby causing the second roller 19 to clamp and limit the side wall of one end of the valve, thus facilitating the centering and clamping of the valve and flange, making it more convenient and faster to use, and ensuring the quality of subsequent welding.

[0038] After the valve and flange are clamped and limited, the first motor 14 is started. The rotation of the first motor 14 drives the rotation of the first roller 15, which in turn drives the flange to rotate. The second motor 18 is started. The rotation of the second motor 18 drives the rotation of the second roller 19, which in turn drives the valve to rotate. At this time, the weld between the valve and flange can be cleaned by the brush 204 to ensure the quality of subsequent welding.

[0039] After the valve and flange are clamped and limited, the tapered rod 302 abuts against the weld. At the same time, the third spring 402 is compressed. When the weld is too large, the tapered rod 302 and the sliding rod 301 can move away from the mounting block 203 under the action of the third spring 402. When the weld is too small, it can push the sliding rod 301 to move closer to the mounting block 203. At the same time, the third spring 402 is compressed. When the sliding rod 301 moves, it can drive the second push pin 504 to slide in the groove 503, thereby pushing the pointer 305 to rotate along the rotating shaft 502. At this time, the vision sensor 304 can detect the scale on the scale plate 303 indicated by the pointer 305, and thus determine whether the size of the weld is within the required range, ensuring the quality of subsequent welding.

[0040] After the inspection is completed, the weld between the valve and the flange can be spot welded by arc welding. Then, the second motor 18 is started. The rotation of the second motor 18 drives the rotation of the second roller 19, which in turn drives the rotation of the valve and the flange. The weld between the valve and the flange can then be fully welded by arc welding, which is more convenient and faster.

[0041] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0042] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A semi-automatic arc welding fixing device for valve flanges, comprising a base plate, characterized in that: The top of the base plate is connected to two symmetrically arranged movable plates via a first movable mechanism. The opposite sidewalls of the two movable plates are connected to two symmetrically arranged first V-shaped plates via a second movable mechanism. The sidewalls of each first V-shaped plate are fixedly connected to two sets of symmetrically arranged first fixing blocks. The sidewalls of each set of first fixing blocks are fixedly connected to a first motor. The output end of the first motor is fixedly connected to a V-shaped first roller. The opposite sidewalls of the two movable plates are connected to two sets of symmetrically arranged second V-shaped plates via a third movable mechanism. The sidewalls of each set of second V-shaped plates are fixedly connected to two symmetrically arranged second fixing blocks. The sidewalls of each set of second fixing blocks are fixedly connected to a second motor. The output end of the second motor is fixedly connected to a second roller. A baffle is fixedly connected to the sidewall of one of the first V-shaped plates. The top of the base plate is provided with a pushing mechanism for pushing the valve. The sidewall of one of the second V-shaped plates is provided with a cleaning mechanism for cleaning the weld. The cleaning mechanism is provided with a detection mechanism for detecting the size of the weld. The pushing mechanism includes a first fixed plate fixedly connected to the top of the base plate, and two symmetrically arranged sleeve rods fixedly connected to the side wall of the first fixed plate. Each sleeve rod has a sleeve sleeved on its side wall, and a pushing plate is fixedly connected to the other end of the sleeve. Each sleeve has a first spring sleeved on its side wall. The movement of the pushing plate is driven by the pushing assembly. The pushing assembly includes a support block fixedly connected to the side wall of the first V-shaped plate, and two symmetrically arranged T-shaped guide rods are inserted into the top of the support block. A moving rod is fixedly connected to the lower end of the T-shaped guide rod, and a first pushing block is fixedly connected to the bottom of the moving rod. A groove is opened on the side wall of the first pushing block. A first pushing pin is fixedly connected to the side wall of the pushing plate and is inserted into the groove. A second spring is sleeved on the side wall of each T-shaped guide rod. A second pushing block is fixedly connected to the side wall of the second V-shaped plate, and the second pushing block includes an inclined surface. The cleaning mechanism includes a connecting frame fixedly connected to the side wall of the second V-shaped plate, and two symmetrically arranged connecting rods are fixedly connected to the side wall of the connecting frame. The other end of the connecting rod is fixedly connected to a mounting block, and a brush is fixedly connected to the side wall of the mounting block. The detection mechanism includes a sliding rod inserted into the side wall of the mounting block, with a tapered rod fixedly connected to one end of the sliding rod. An arc-shaped scale plate is fixedly connected to the side wall of the mounting block, and a vision sensor is fixedly connected to the side wall of the mounting block. A pointer is rotatably connected to the side wall of the mounting block via a rotating mechanism, and a reset mechanism is provided between the sliding rod and the mounting block. The rotating mechanism includes a connecting block fixedly connected to the side wall of the mounting block, and a rotating shaft rotatably connected to the bottom of the connecting block. The pointer is fixed to the lower end of the rotating shaft, and a sliding groove is provided at the top of the pointer. A second push pin is fixedly connected to the top of the sliding rod, and the second push pin is inserted into the sliding groove.

2. The valve flange semi-automatic arc welding fixing device according to claim 1, characterized in that: The reset mechanism includes a fixed ring that is fixedly sleeved on the side wall of the sliding rod, and a third spring is sleeved on the side wall of the sliding rod.

3. The semi-automatic arc welding fixing device for valve flanges according to claim 2, characterized in that: The first moving mechanism includes two symmetrically arranged second fixed plates fixedly connected to the top of the base plate, and guide rods fixedly connected to the opposite side walls of the two second fixed plates. The moving plate is sleeved on the side wall of the guide rod, and a double-ended screw is rotatably connected to the opposite side walls of the two second fixed plates. The moving plate is threadedly connected to the side wall of the double-ended screw. A third motor is fixedly connected to the side wall of the second fixed plate, and the output end of the third motor is fixed to one end of the double-ended screw.

4. The semi-automatic arc welding fixing device for valve flanges according to claim 3, characterized in that: The second moving mechanism includes two symmetrically arranged first fixed rods fixedly connected to the opposite sidewalls of two second fixed plates, and the moving plate is sleeved on the sidewall of the first fixed rod. The sidewall of the first fixed rod is sleeved with two symmetrically arranged first L-shaped plates. The top of the first V-shaped plate is fixed to the first L-shaped plate, and the sidewall of each first fixed rod is sleeved with two symmetrically arranged fourth springs.

5. The semi-automatic arc welding fixing device for valve flanges according to claim 4, characterized in that: The third moving mechanism includes two symmetrically arranged second fixed rods fixedly connected to the opposite sidewalls of the two second fixed plates, and the moving plate is sleeved on the sidewall of the second fixed rod. The sidewall of the second fixed rod is sleeved with two symmetrically arranged second L-shaped plates. The top of the second V-shaped plate is fixed to the second L-shaped plate, and the sidewall of each second fixed rod is sleeved with a fifth spring.

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