Engine thin-wall sheet metal welding fixture

Abstract

The invention discloses a welding fixture for thin-walled sheet metal of an engine, and specifically relates to the technical field of welding fixtures. The invention comprises a base, a clamping device is arranged on the top of the base, and the clamping device comprises a groove plate, the bottom end of the groove plate is fixedly connected with a support rod, the top end of the gear rod is fixedly connected with a top block, the outer surface of the top block slides on the inner wall of the first slide groove, one end of the circular ring is fixedly connected with a pressure block, and the outer surface of the groove block is provided with a third slide groove. The invention provides a clamping device, places an inner ring plate and an outer wall plate on the outer surface of the groove plate, and then rotates a rotating shaft to control the top block and the groove block to move to fix the positions of the inner ring plate and the outer wall plate on the outer surface of the groove plate respectively, performs argon arc welding on the periphery of the inner ring plate and the outer wall plate, does not need to hold the inner ring and the rear wall for welding, and can connect argon gas at the through hole at the bottom end of the disc to perform argon gas protection on the reverse side of the welded part, thereby stabilizing the welding quality and improving the work efficiency of the workers during welding.

Description

Technical Field

[0001] The invention relates to the technical field of welding fixtures, in particular to a welding fixture for thin-walled sheet metal of an engine. Background Art

[0002] In the sheet metal industry, to save electricity costs, stamping machines are generally not used for welding smaller sheet metal parts. Instead, corresponding sheet metal welding fixtures are designed for sheet metal welding. For example, when the welding surface is the side and the top surface cannot be clamped, a push-on tool is usually used to press the end surface to weld the weld surface. The rear wall assembly is a key subassembly of the oil tank, and its product quality directly affects the oil volume of the oil tank. This assembly is welded along the circumference of a single rear wall and inner ring by argon arc welding. The wall thickness is 1.0mm, and the combined weld diameter is 315mm, making it a thin-walled weldment.

[0003] When welding the inner ring and outer wall of the rear wall assembly, since there is no welding fixture for the combined welding, the rear wall will deform greatly after the welding is completed in a free state, affecting the subsequent assembly of the lubricating oil tank. In addition, a dedicated person is required to provide reverse argon gas protection during the welding of parts, which brings a huge workload to the welders and assembly operators, resulting in low welding efficiency. Summary of the Invention

[0004] The present invention proposes an engine thin-wall sheet metal welding fixture to solve the problem that when welding the inner ring and outer wall of the rear wall assembly, the rear wall is greatly deformed after the welding is completed in a free state, affecting the subsequent lubricating oil tank assembly work. In addition, a dedicated person is required to provide reverse argon protection during parts welding, which brings a huge workload to the welder and assembly operator, resulting in low welding efficiency.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an engine thin-walled sheet metal welding fixture, including a base, a clamping device is provided at the top of the base, the clamping device includes a groove plate, the outer surface of the groove plate is provided with an inner ring plate and an outer wall plate, the bottom end of the groove plate is fixedly connected to a support rod, the bottom end of the support rod is rotatably connected to the inner wall of the base, the outer surface of the groove plate is provided with two first slide grooves and a second slide groove, the interior of the groove plate is provided with a rectangular groove, the inner wall of the groove plate is rotatably connected to a rotating shaft, the bottom end of the rotating shaft is fixedly connected to a gear, the gear is located inside the rectangular groove, and the inner wall of the rectangular groove is slidably connected to two gear rods, one side of the two gear rods are respectively meshed with the two sides of the outer surface of the gear, and the top end of the gear rod is fixed The cam is connected to the sliding member, and the outer surface of the sliding member is connected to the inner wall of the first sliding groove. The inner walls of the first sliding groove and the second sliding groove are rotatably connected to the first screw, and the outer surface of the first screw is provided with a long thread and a short thread. The inner wall of the sliding member is threadedly connected to the outer surface of the long thread of the first screw, and the inner wall of the second sliding groove is slidably connected to the slot block, and the inner wall of the slot block is threadedly connected to the outer surface of the short thread of the first screw. One side of the slot block is rotatably connected to the second screw, and the outer surface of the second screw is provided with threads in opposite directions. Both ends of the outer surface of the second screw are threadedly connected to a ring, and one end of the ring is fixedly connected to a pressure block. The outer surface of the slot block is provided with a third sliding groove, and the outer surface of the pressure block slides on the inner wall of the third sliding groove.

[0006] The effect achieved by the above components is: by setting the rotating shaft, when argon welding is performed on the inner ring plate and the outer wall plate, the inner ring plate is first placed on the top of the groove plate so that the center of the inner ring plate is close to the center of the rotating shaft, and then the outer wall plate and the inner ring plate are assembled and docked, and the rotating shaft is rotated to control the rotation of the gear, so that the two gear rods move in opposite directions on the inner wall of the rectangular groove, and the edges of the two top blocks are pressed against the inner ring edge of the inner ring plate to fix the position of the inner ring plate on the outer surface of the groove plate. When the top block slides on the inner wall of the first slide groove, it will move on the outer surface of the first screw with a long thread, driving the first screw to rotate, and the first screw The rotation of the rod will cause the groove block to slide on the outer surface of the first screw with a short thread and the inner wall of the second slide groove, so that the two pressure blocks on the outer surface of the groove block are located at the outer surface edge of the outer wall plate, and then the second screw is rotated to make the two rings move in the same direction on the outer surface of the second screw, driving the two pressure blocks to slide on the inner wall of the third slide groove and press the upper and lower sides at the outer surface edge of the outer wall plate to fix the position of the outer wall plate on the outer surface of the groove plate and the relative position of the inner ring plate, and then argon arc welding is performed around the inner ring plate and the outer wall plate. During argon arc welding, the groove plate can be pushed to control the rotation of the groove plate to adjust the angle for easy welding.

[0007] Preferably, two through holes are provided on the outer surface of the trough plate, and a copper ring is fixedly connected to one side of the inner wall of the through hole.

[0008] The effect achieved by the above components is: when welding the inner ring plate and the outer wall plate with the help of the clamping device, the argon delivery pipeline can be connected to the copper ring on the outer surface of the groove plate, and the argon gas can be input through the through hole to provide reverse argon protection for the inner ring plate and the outer wall plate.

[0009] Preferably, a cylindrical block is fixedly connected to the top end of the rotating shaft, and a plurality of protrusions are provided on the outer surface of the cylindrical block.

[0010] The effect achieved by the above components is that by holding the convex block on the outer surface of the cylindrical block, the rotation of the shaft and the gear can be controlled more conveniently to adjust the position of the gear rod and the top block.

[0011] Preferably, the inner wall of the cylindrical block is threadedly connected with bolts, and a plurality of positioning holes are formed on the outer surface of the grooved plate on a side close to the rotating shaft.

[0012] The effect achieved by the above components is: after rotating the shaft to control the gear to adjust the position of the top block, the bolt can be rotated to move the bolt downward on the inner wall of the cylindrical block and the bottom end of the bolt can be inserted into the inside of the positioning hole to fix the relative position between the shaft and the slot plate, so as to avoid the shaft from accidentally rotating as much as possible, causing the position of the top block and the slot block to shift and affect the stability of the position fixation of the inner ring plate and the outer wall plate.

[0013] Preferably, a positioning rod is fixedly connected to the bottom end of the groove plate, a circular groove is provided on the outer surface of the base, and the bottom end of the positioning rod slides on the inner wall of the circular groove.

[0014] The effect achieved by the above components is: when the slot plate is pushed to rotate, the bottom end of the positioning rod will rotate on the inner wall of the circular groove to support the bottom end of the slot plate and limit the angle between the slot plate and the base, thereby avoiding the angle of the slot plate from being deflected as much as possible.

[0015] Preferably, a convex piece is fixedly connected to the outer surface of the second screw, and the convex piece is made of rubber material.

[0016] The effect achieved by the above components is that the second screw can be pushed to rotate more easily by pressing the rubber protrusion on the outer surface of the second screw with the hand without slipping.

[0017] Preferably, a positioning device is provided at the bottom end of the trough plate, and the positioning device includes a cylinder, the top end of the cylinder is fixedly connected to the bottom end of the trough plate, the inner wall of the cylinder is slidably connected to a sliding rod, the bottom end of the sliding rod is fixedly connected to a conical block, and the top end of the sliding rod is provided with a spring, and the two ends of the spring are respectively fixedly connected to the top end of the sliding rod and the bottom end of the trough plate.

[0018] The effect achieved by the above components is: when pushing the slot disk to rotate, you can hold the outer surface of the cylinder and the sliding rod or use your hand to press the convex strip on one side of the slot disk to push the slot disk to rotate. When the slot disk is stationary, the compressed spring inside the cylinder will extend outward to push the sliding rod downward, and the conical block at the bottom end of the sliding rod will press against the outer surface of the base, thereby fixing the relative position between the slot disk and the base.

[0019] Preferably, a fourth sliding groove is opened on one side of the cylinder, a slider is fixedly connected to one side of the sliding rod, and the outer surface of the slider slides on the inner wall of the fourth sliding groove.

[0020] The effect achieved by the above components is: when controlling the rotation of the groove disk, you can hook your hand on the outer surface of the slider to control the sliding rod to slide upward on the inner wall of the cylinder and compress the spring, so that the conical block moves away from the outer surface of the base to release the position fixation of the groove disk, making it easier to control the rotation of the groove disk.

[0021] Preferably, a plurality of rubber protrusions are fixedly connected to the bottom end of the conical block, and the protrusions are distributed and filled on the outer surface of the conical block.

[0022] The effect achieved by the above components is that the friction force when the bottom end of the outer surface of the conical block contacts the outer surface of the base can be increased by arranging the rubber protrusions.

[0023] Preferably, a round rod is provided inside the cylinder, the top end of the round rod is fixedly connected to the bottom end of the groove plate, and the inner wall of the sliding rod slides on the outer surface of the round rod.

[0024] The effect achieved by the above components is that when the sliding rod slides on the inner wall of the cylinder to deform the spring, it will slide on the outer surface of the round rod. The round rod can reinforce the internal shape of the spring to avoid lateral deformation when the spring is deformed, which affects normal use.

[0025] In summary, the beneficial effects of the present invention are:

[0026] By setting up a clamping device, when performing argon arc welding on the outer wall plate and the inner ring plate, the inner ring plate and the outer wall plate are placed on the outer surface of the groove disk, and then the top block and the groove block are controlled to move by rotating the rotating shaft to fix the positions of the inner ring plate and the outer wall plate on the outer surface of the groove disk respectively, and argon arc welding is performed on the periphery of the inner ring plate and the outer wall plate. There is no need to hold the inner ring and the back wall for welding, and argon gas can be connected to the through hole at the bottom of the disc to perform argon protection on the back side of the welded part, thereby reducing deformation of parts during welding, stabilizing and improving welding quality, reducing dimensional deviation, and improving the work efficiency of workers during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the base of the present invention;

[0029] Figure 3 This invention Figure 2 A schematic diagram of a partially enlarged three-dimensional structure;

[0030] Figure 4 This invention Figure 2 A schematic diagram of a partially enlarged three-dimensional structure at point B;

[0031] Figure 5 It is a partial cross-sectional three-dimensional structural schematic diagram of the groove plate of the present invention;

[0032] Figure 6 It is a schematic diagram of the three-dimensional structure of the rotating shaft of the present invention;

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of the slot block of the present invention;

[0034] Figure 8 It is a schematic diagram of the three-dimensional structure of the support rod of the present invention;

[0035] Figure 9 It is a schematic diagram of the three-dimensional structure of the cylinder of the present invention;

[0036] Figure 10 It is a schematic diagram of the partial cross-sectional three-dimensional structure of the cylinder of the present invention.

[0037] Description of reference numerals:

[0038] 1. Base; 2. Clamping device; 3. Positioning device; 4. Inner ring plate; 5. Outer wall plate; 21. Support rod; 22. Grooved plate; 23. First slide groove; 24. Second slide groove; 25. Rotating shaft; 26. Gear; 27. Rectangular groove; 28. Gear rod; 29. ​​Top block; 210. First screw; 211. Grooved block; 212. Second screw; 213. Ring; 214. Third slide groove; 215. Press block; 216. Cylindrical block; 217. Positioning hole; 218. Bolt; 219. Positioning block; 220. Through hole; 221. Copper ring; 222. Circular groove; 223. Positioning rod; 224. Lug; 31. Cylinder; 32. Sliding rod; 33. Conical block; 34. Spring; 35. Fourth slide groove; 36. Slider; 37. Round rod; 38. Raised strip; 39. Protrusion. DETAILED DESCRIPTION

[0039] Reference Figure 1-6As shown, this embodiment discloses an engine thin-walled sheet metal welding fixture, including a base 1, a clamping device 2 is provided at the top of the base 1, the clamping device 2 includes a groove plate 22, the outer surface of the groove plate 22 is provided with an inner ring plate 4 and an outer wall plate 5, the bottom end of the groove plate 22 is fixedly connected to a support rod 21, the bottom end of the support rod 21 is rotatably connected to the inner wall of the base 1, the outer surface of the groove plate 22 is provided with two first slide grooves 23 and a second slide groove 24, a rectangular groove 27 is provided inside the groove plate 22, the inner wall of the groove plate 22 is rotatably connected to a rotating shaft 25, the bottom end of the rotating shaft 25 is fixedly connected to a gear 26, the gear 26 is located inside the rectangular groove 27, the inner wall of the rectangular groove 27 is slidably connected to two gear rods 28, one side of the two gear rods 28 is respectively connected to the outer surface of the gear 26 The two sides of the surface are meshed, and the top of the gear rod 28 is fixedly connected with a top block 29. The outer surface of the top block 29 slides on the inner wall of the first slide groove 23. The inner walls of the first slide groove 23 and the second slide groove 24 are rotatably connected with the first screw rod 210. The outer surface of the first screw rod 210 is provided with a long thread and a short thread. The inner wall of the top block 29 is threadedly connected to the outer surface of the first screw rod 210 provided with a long thread. The inner wall of the second slide groove 24 is slidably connected with a groove block 211. The inner wall of the groove block 211 is threadedly connected to the outer surface of the first screw rod 210 provided with a short thread. One side of the groove block 211 is rotatably connected with the second screw rod 212. The outer surface of the second screw rod 212 is provided with threads in opposite directions. The outer surfaces of the second screw rod 212 are threadedly connected with rings 213 at both ends. One end of the ring 213 is fixedly connected to a pressure block 215, and the outer surface of the groove block 211 is provided with a third slide groove 214. The outer surface of the pressure block 215 slides on the inner wall of the third slide groove 214. By setting the rotating shaft 25, when argon welding is performed on the inner ring plate 4 and the outer wall plate 5, the inner ring plate 4 is first placed on the top end of the groove disk 22, so that the center of the inner ring plate 4 is close to the center of the rotating shaft 25, and then the outer wall plate 5 is assembled and docked with the inner ring plate 4. The rotating shaft 25 controls the rotation of the gear 26, so that the two gear rods 28 move in opposite directions on the inner wall of the rectangular groove 27, and the edges of the two top blocks 29 are pressed against the inner ring edge of the inner ring plate 4, so that the position of the inner ring plate 4 on the outer surface of the groove disk 22 is fixed. When the top block 29 slides on the inner wall of the first slide groove 23, The outer surface of the first screw 210 provided with a long thread moves, driving the first screw 210 to rotate. The rotation of the first screw 210 causes the groove block 211 to slide on the outer surface of the first screw 210 provided with a short thread on the inner wall of the second slide groove 24, so that the two pressing blocks 215 on the outer surface of the groove block 211 are located at the outer surface edge of the outer wall plate 5. Then, the second screw 212 is rotated to make the two rings 213 move in the same direction on the outer surface of the second screw 212, driving the two pressing blocks 215 to slide on the inner wall of the third slide groove 214 and press the upper and lower sides at the outer surface edge of the outer wall plate 5 to fix the position of the outer wall plate 5 on the outer surface of the groove plate 22 and the relative position of the inner ring plate 4. Then, argon arc welding is performed on the periphery of the inner ring plate 4 and the outer wall plate 5.During argon arc welding, the groove plate 22 can be pushed to control the rotation of the groove plate 22 to adjust the angle for easy welding. There is no need to hold the inner ring and the rear wall for welding, which reduces the deformation of parts during welding, stabilizes and improves the welding quality, reduces dimensional deviation, and improves the work efficiency of workers during welding.

[0040] Reference Figure 2-8 As shown, this embodiment discloses that two through holes 220 are provided on the outer surface of the groove plate 22, and a copper ring 221 is fixedly connected to one side of the inner wall of the through hole 220. When the inner ring plate 4 and the outer wall plate 5 are welded with the help of the clamping device 2, an argon gas delivery pipeline can be connected to the copper ring 221 on the outer surface of the groove plate 22, and argon gas is input through the through hole 220 to perform argon gas protection on the reverse side of the inner ring plate 4 and the outer wall plate 5. The top end of the rotating shaft 25 is fixedly connected to a cylindrical block 216, and a plurality of protrusions are provided on the outer surface of the cylindrical block 216. Holding the protrusions on the outer surface of the cylindrical block 216 can more conveniently control the rotation of the rotating shaft 25 and the gear 26 to adjust the position of the gear rod 28 and the top block 29.

[0041] Reference Figure 2-8 As shown, this embodiment discloses that the inner wall of the cylindrical block 216 is threadedly connected with a bolt 218, and a plurality of positioning holes 217 are opened on the outer surface of the groove plate 22 near the side of the rotating shaft 25. After the rotating shaft 25 is rotated to control the rotation of the gear 26 to adjust the position of the top block 29, the bolt 218 can be rotated to move the bolt 218 downward on the inner wall of the cylindrical block 216, and the bottom end of the bolt 218 is inserted into the interior of the positioning hole 217 to fix the relative position between the rotating shaft 25 and the groove plate 22, and to avoid as much as possible the accidental rotation of the rotating shaft 25, which causes the position of the top block 29 and the groove block 211 to deviate and affect the stability of the position fixation of the inner ring plate 4 and the outer wall plate 5. The bottom end of 22 is fixedly connected with a positioning rod 223, and a circular groove 222 is opened on the outer surface of the base 1. The bottom end of the positioning rod 223 slides on the inner wall of the circular groove 222. When the slot disk 22 is pushed to rotate, the bottom end of the positioning rod 223 will rotate on the inner wall of the circular groove 222 to support the bottom end of the slot disk 22 and limit the angle between the slot disk 22 and the base 1, avoiding the angle of the slot disk 22 from being deflected as much as possible. The outer surface of the second screw rod 212 is fixedly connected with a protrusion 224, which is made of rubber material. Pressing the rubber protrusion 224 on the outer surface of the second screw rod 212 with your hand can make it easier to push the second screw rod 212 to rotate without slipping.

[0042] Reference Figure 1 、 Figure 2 、 Figure 5 、 Figure 8 and Figure 9 as well as Figure 10When the cam 32 is in a stationary state, the spring 34 compressed inside the cylinder 31 will extend outward to push the sliding rod 32 downward, so that the conical block 33 at the bottom end of the sliding rod 32 presses against the outer surface of the base 1, thereby fixing the relative position between the cam 32 and the base 1.

[0043] Reference Figure 1 、 Figure 2 、 Figure 5 、 Figure 8 and Figure 9 as well as Figure 10 As shown, this embodiment discloses that a fourth sliding groove 35 is opened on one side of the cylinder 31, and a slider 36 is fixedly connected to one side of the sliding rod 32. The outer surface of the slider 36 slides on the inner wall of the fourth sliding groove 35. When controlling the rotation of the groove disc 22, you can hook your hand on the outer surface of the slider 36 to control the sliding rod 32 to slide upward on the inner wall of the cylinder 31 and compress the spring 34, so that the conical block 33 is away from the outer surface of the base 1 to release the position fixation of the groove disc 22, which is convenient for controlling the rotation of the groove disc 22. The bottom end of the conical block 33 is fixedly connected to a plurality of rubber protrusions 39, which are filled and distributed on the conical block 33. The outer surface of the cone 33 can be increased by providing a rubber protrusion 39 when the friction force when the bottom end of the outer surface of the cone block 33 contacts the outer surface of the base 1. A round rod 37 is provided inside the cylinder 31. The top of the round rod 37 is fixedly connected to the bottom end of the groove plate 22. The inner wall of the sliding rod 32 slides on the outer surface of the round rod 37. When the sliding rod 32 slides on the inner wall of the cylinder 31 to deform the spring 34, it will slide on the outer surface of the round rod 37. The round rod 37 can be used to reinforce the internal shape of the spring 34 to avoid as much as possible the lateral deformation of the spring 34 when it is deformed, which affects normal use.

[0044] The working principle is as follows: when welding the outer wall plate 5 and the inner ring plate 4, first place the inner ring plate 4 on the top of the groove plate 22 so that the center of the inner ring plate 4 is close to the center of the rotating shaft 25, then assemble and dock the outer wall plate 5 with the inner ring plate 4, hold the convex block on the outer surface of the cylindrical block 216 and rotate the rotating shaft 25 to control the rotation of the gear 26, so that the two gear rods 28 move in opposite directions on the inner wall of the rectangular groove 27, and press the edges of the two top blocks 29 against the inner ring edge of the inner ring plate 4 to fix the position of the inner ring plate 4 on the outer surface of the groove plate 22. The top block 29 is in the first slide groove 23 When the inner wall slides, it will move on the outer surface of the first screw 210 with a long thread, driving the first screw 210 to rotate. The rotation of the first screw 210 will cause the groove block 211 to slide on the outer surface of the first screw 210 with a short thread on the inner wall of the second slide 24, so that the two pressing blocks 215 on the outer surface of the groove block 211 are located at the outer surface edge of the outer wall plate 5. Then, the second screw 212 is rotated to make the two rings 213 move in the same direction on the outer surface of the second screw 212, driving the two pressing blocks 215 to slide on the inner wall of the third slide 214 and press on the outer wall. The upper and lower sides of the outer surface edge of the plate 5 are used to fix the position of the outer wall plate 5 on the outer surface of the groove plate 22 and the relative position of the inner ring plate 4. Then, the argon gas delivery pipeline is connected to the copper ring 221 on the outer surface of the groove plate 22, and the argon gas is input through the through hole 220 to perform reverse argon gas protection on the inner ring plate 4 and the outer wall plate 5. Subsequently, argon arc welding is performed around the inner ring plate 4 and the outer wall plate 5. During argon arc welding, the outer surface of the slider 36 can be hooked by hand to control the sliding rod 32 to slide upward on the inner wall of the cylinder 31 and compress the spring 34, so that the conical block 33 is away from the outer surface of the base 1 to release the groove plate. The fixed position of 22 facilitates the control of the rotation of the slot disk 22. When the slot disk 22 is pushed to rotate, the bottom end of the positioning rod 223 will rotate on the inner wall of the circular groove 22 to support the bottom end of the slot disk 22 and limit the angle between the slot disk 22 and the base 1, avoiding the angle of the slot disk 22 from being deflected as much as possible. When the hand is released, the compressed spring 34 inside the cylinder 31 will extend outward to push the sliding rod 32 downward, and the side of the conical block 33 at the bottom end of the sliding rod 32 with a rubber protrusion 39 will be pressed against the outer surface of the base 1, thereby fixing the relative position between the slot disk 22 and the base 1.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification of the above embodiment based on the technical essence of the present invention that does not deviate from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. Engine thin-wall sheet metal welding fixture, characterized by: The invention comprises a base (1), wherein a clamping device (2) is arranged at the top of the base (1), wherein the clamping device (2) comprises a groove plate (22), wherein the outer surface of the groove plate (22) is provided with an inner ring plate (4) and an outer wall plate (5), wherein the bottom end of the groove plate (22) is fixedly connected to a support rod (21), wherein the bottom end of the support rod (21) is rotatably connected to the inner wall of the base (1), wherein the outer surface of the groove plate (22) is provided with two first slide grooves (23) and a second slide groove (24), wherein a rectangular groove (27) is arranged inside the groove plate (22), wherein the inner wall of the groove plate (22) is rotatably connected to a rotating shaft (25), wherein the bottom end of the rotating shaft (25) is fixedly connected to a gear (26), wherein the gear (26) is located in the rectangular groove. (27), the inner wall of the rectangular groove (27) is slidably connected to two gear rods (28), one side of the two gear rods (28) is respectively meshed with the two sides of the outer surface of the gear (26), the top of the gear rod (28) is fixedly connected to a top block (29), the outer surface of the top block (29) slides on the inner wall of the first slide groove (23), the inner walls of the first slide groove (23) and the second slide groove (24) are rotatably connected to a first screw rod (210), the outer surface of the first screw rod (210) is provided with a long thread and a short thread, the inner wall of the top block (29) is threadedly connected to the outer surface of the first screw rod (210) provided with a long thread, and the inner wall of the second slide groove (24) is slidably connected to a slot block (211) The inner wall of the groove block (211) is threadedly connected to the outer surface of the first screw (210) provided with a short thread. A second screw (212) is rotatably connected to one side of the groove block (211). The outer surface of the second screw (212) is provided with threads in opposite directions. Both ends of the outer surface of the second screw (212) are threadedly connected to a ring (213). One end of the ring (213) is fixedly connected to a pressing block (215). A third sliding groove (214) is provided on the outer surface of the groove block (211). The outer surface of the pressing block (215) slides on the inner wall of the third sliding groove (214). Two through holes (220) are provided on the outer surface of the groove plate (22). One side of the inner wall of the through hole (220) is fixedly connected to the inner wall of the through hole (220). The rotating shaft (25) is fixedly connected with a copper ring (221); the top of the rotating shaft (25) is fixedly connected with a cylindrical block (216), and the outer surface of the cylindrical block (216) is provided with a plurality of protrusions; the inner wall of the cylindrical block (216) is threadedly connected with a bolt (218), and the outer surface of the groove plate (22) close to the rotating shaft (25) is provided with a plurality of positioning holes (217); the bottom end of the groove plate (22) is fixedly connected with a positioning rod (223), the outer surface of the base (1) is provided with a circular groove (222), and the bottom end of the positioning rod (223) slides on the inner wall of the circular groove (222); the outer surface of the second screw rod (212) is fixedly connected with a protrusion (224), and the protrusion (224) is made of rubber material;A positioning device (3) is provided at the bottom end of the groove plate (22), and the positioning device (3) comprises a cylinder (31), the top end of the cylinder (31) is fixedly connected to the bottom end of the groove plate (22), a sliding rod (32) is slidably connected to the inner wall of the cylinder (31), the bottom end of the sliding rod (32) is fixedly connected to a conical block (33), a spring (34) is provided at the top end of the sliding rod (32), two ends of the spring (34) are respectively fixedly connected to the top end of the sliding rod (32) and the bottom end of the groove plate (22), and a plurality of convex strips (38) are fixedly connected to one side of the groove plate (22). ; A fourth slide groove (35) is provided on one side of the cylinder (31); a slider (36) is fixedly connected to one side of the sliding rod (32); the outer surface of the slider (36) slides on the inner wall of the fourth slide groove (35); a plurality of rubber protrusions (39) are fixedly connected to the bottom end of the conical block (33); the protrusions (39) are filled and distributed on the outer surface of the conical block (33); a round rod (37) is provided inside the cylinder (31); the top end of the round rod (37) is fixedly connected to the bottom end of the groove plate (22); the inner wall of the sliding rod (32) slides on the outer surface of the round rod (37). ;

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