A fixing device for welding a reducing joint

Abstract

The present invention relates to the technical field of metal welding, and more specifically, to a fixing device for welding a reducer, comprising a base and a fixing mechanism, wherein a fixing mechanism is installed on one side of the upper part of the base; the fixing mechanism comprises a mobile motor, a mobile column is fixedly installed on one end of the output shaft of the mobile motor, an extrusion plate is slidably installed on the outer wall of the mobile column, a first rope is installed inside the extrusion plate, a support rod is fixedly installed on the other end of the first rope, a movable block is installed on one side of the support rod, a suction cup is fixedly installed on one side of the movable block, and two rubber plates are symmetrically installed around the outer side of the movable block. The movable block is hinged on the support rod, so that the movable block can rotate on the support rod and can be completely in contact with the inner wall of the reducer, thereby ensuring the support area, preventing the deformation of the reducer caused by a small support area, and ensuring the stability of subsequent welding operations.

Description

Technical Field

[0001] The invention relates to the technical field of metal welding, in particular to a fixing device for welding a reducing joint. Background Art

[0002] Reducing joints, also known as reducers, are commonly known as reducers. They are one of the chemical pipeline accessories and are used to connect two pipes of different diameters. According to their appearance and usage specifications, they are divided into concentric reducers and eccentric reducers. According to their materials, they can be classified into stainless steel, alloy steel, carbon steel, etc. According to their connection forms, they can be classified into welded reducers, internal thread reducers, external thread reducers, etc.

[0003] Reducers are widely used, mainly in industrial fields such as dairy, food, beer, beverages, pharmaceuticals, cosmetics, automobiles, shipbuilding, and civil construction.

[0004] When the diameter of a circular ventilation duct is changed, a reducer (the reducer here is trumpet-shaped) needs to be welded between two sections of ventilation ducts of different diameters. During welding, the staff clamps the ventilation duct and the reducer, then brings the joint ends close to each other and then welds. When fixing the ventilation duct, the existing clamps mostly clamp the ends of the ventilation duct from the outside, and the clamps are difficult to fit the side walls of the trumpet-shaped reducer. This type of workpiece is difficult to fix, and the contact area between the clamp and the trumpet-shaped reducer is small, which may lead to unstable clamping, which is not conducive to subsequent welding operations. In addition, the thickness of the ventilation duct is relatively thin (for example: the thickness of low-pressure and medium-pressure ventilation ducts is about 0.5 mm, and the thickness of high-pressure ventilation ducts is about 0.75 mm). The external clamping clamp can easily cause the ventilation duct to be squeezed and deformed, and the diameter of the ventilation duct is also large. The external clamping clamp occupies a large area. For ventilation ducts with longer lengths, the stability of the clamping method of the clamping end is biased, which can easily cause welding shaking errors. Summary of the invention

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a fixing device for welding a reducing joint, comprising a base and a fixing mechanism, wherein the fixing mechanism is installed on one side of the upper part of the base;

[0007] The fixing mechanism includes a moving motor, a moving column is fixedly installed at one end of the output shaft of the moving motor, an extrusion plate is slidably installed on the outer wall of the moving column, one end of a first rope is installed inside the extrusion plate, a support rod is fixedly installed on the other end of the first rope, a movable block is installed on one side of the support rod, a suction cup is fixedly installed on one side of the movable block, two rubber plates are symmetrically installed on the outer side of the movable block, and a scraper is fixedly installed on the same end of the two rubber plates.

[0008] Furthermore, a bolt is slidably installed inside the movable column, and a nut is rotatably installed on the outer side wall of the bolt.

[0009] Furthermore, a pressure sensor is fixedly mounted on the outer side wall of the moving column, and the pressure sensor is placed on a side of the bolt close to the moving motor, and the distance between the pressure sensor and the bolt is equal to the width of the extrusion plate.

[0010] Furthermore, one end of three first springs are evenly distributed and fixedly installed on one side of the extrusion plate, a sliding plate is fixedly installed on the other end of the first spring, a first rope is fixedly installed on one side of the sliding plate, a rubber block is symmetrically installed for rotation inside the extrusion plate, a first rope is slidably installed between two of the rubber blocks, one end of the second spring is fixedly installed on one side of the two rubber blocks away from each other, and the other ends of the two second springs are fixedly installed on one side of the extrusion plate.

[0011] Furthermore, three support rods are evenly distributed and hinged at one end of the movable column, three fixed pulleys are evenly distributed and fixedly installed on the outer side wall of the movable column, and rubber rings are movably installed inside the three support rods.

[0012] Furthermore, a movable block is hinged on one side of the support rod, a suction cup is fixedly installed on one side of the movable block, connecting plates are fixedly installed on two symmetrical sides of the movable block, and two connecting plates are fixedly installed on one side away from each other with a receiving groove, one end of a third spring is fixedly installed on one side inside the receiving groove, a rubber plate is fixedly installed on the other end of the third spring, and the rubber plate is slidably installed inside the storing groove, second ropes are fixedly installed on both ends of the opposite sides of the bottom of the two rubber plates, and a U-shaped rod is fixedly installed on the lower surfaces of the two second rope ends placed at the same end of the two rubber plates, an extrusion block is fixedly installed on one end of the U-shaped rod away from the second rope, and a fixed shell is fixedly installed on both ends of the movable block, one end of a fifth spring is fixedly installed on one side of the bottom of the fixed shell, and the other end of the fifth spring is fixedly installed on one side of the bottom of the extrusion block, and the fifth spring is slidably sleeved on the outer side wall of the U-shaped rod.

[0013] Furthermore, one end of a fourth spring is fixedly mounted on the bottom of one side of the three movable blocks close to each other, and the other end of the fourth spring is fixedly mounted on the side of the support rod closest to each other.

[0014] Furthermore, an auxiliary plate is fixedly installed in the middle of the base, and the top of the auxiliary plate is arc-shaped.

[0015] Furthermore, an adjustment mechanism is installed inside the base, and the adjustment mechanism includes two fixed motors. Fixed motors are fixedly installed on both symmetrical sides of the base. One end of the output shaft of the fixed motor is fixedly installed with one end of a threaded rod, and the other end of the threaded rod is rotatably installed on one side of the auxiliary plate. A movable frame is engaged and installed on the outer wall of the threaded rod.

[0016] The beneficial effects of the present invention are as follows:

[0017] (1) In the fixing device for welding a reducer described in the present invention, the movable block is hinged on the support rod, so that the movable block can rotate on the support rod and can completely fit and contact the inner wall of the reducer, thereby ensuring the support area, preventing the deformation of the reducer caused by a small support area, and ensuring the stability of subsequent welding operations;

[0018] The three support rods rotate and open, and the rubber plate drives the scraper to move in contact with the inner wall of the ventilation duct (or reducer), scrapes off the dust on the inner wall of the ventilation duct (or reducer) just above the movable block, and then the suction cup contacts and squeezes to fit the inner wall of the ventilation duct (or reducer). Compared with the rigid support in the prior art, the soft suction cup has greater friction with the inner wall of the ventilation duct (or reducer), and the support is more stable. The support and fixation are carried out from the inner wall of the ventilation duct (or reducer), which makes it less likely for the ventilation duct (or reducer) to deform. The scraper scrapes off the dust on the inner wall of the ventilation duct (or reducer) above the suction cup in advance, so that the suction cup and the inner wall of the ventilation duct (or reducer) are more firmly adsorbed, further enhancing the support stability, reducing the possibility of dislocation, sliding and shaking of the ventilation duct (or reducer) during welding, and improving the welding quality;

[0019] Start the two mobile motors to drive the fixed reducer and ventilation duct to rotate synchronously, and the workers begin welding. The synchronous rotation of the reducer and ventilation duct keeps the welding point in a fixed position, making the welding operation more convenient for the workers.

[0020] (2) The fixing device for welding a reducer described in the present invention has the following advantages: when the inner diameter of the ventilation duct is small, the opening range of the support rod is small so that the suction cup can contact and fit the inner wall of the ventilation duct (or the reducer). At this time, the extrusion plate continues to move backward to increase the force of the first rope, thereby increasing the force of the suction cup squeezing the inner wall of the ventilation duct (or the reducer). When the tension of the first rope is greater than the squeezing and friction force of the two rubber blocks on it, it will drive the sliding plate to move toward the rubber block, that is, extend the length of the first rope between the rubber block and the support rod, thereby reducing the tension of the first rope, thereby preventing the suction cup from excessively squeezing the inner wall of the ventilation duct (or the reducer) and preventing the ventilation duct (or the reducer) from deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 A schematic diagram of the overall structure of a fixing device for welding a reducing joint provided by the present invention;

[0023] Figure 2 A schematic diagram of the connection of a mobile motor of a fixing device for welding a reducing joint provided by the present invention;

[0024] Figure 3 A schematic diagram of the connection of an extrusion block of a fixing device for welding a reducing joint provided by the present invention;

[0025] Figure 4 A schematic diagram of a third spring connection of a fixing device for welding a reducing joint provided by the present invention;

[0026] Figure 5 A schematic diagram of a suction cup connection of a fixing device for welding a reducing joint provided by the present invention;

[0027] Figure 6 A schematic diagram of the internal structure of an extruded plate of a fixing device for welding a reducing joint provided by the present invention;

[0028] Figure 7 for Figure 2 A magnified image of point A;

[0029] Figure 8 for Figure 3 A magnified view of point B;

[0030] Fig. 9 for Figure 4 Enlarged view of point C;

[0031] Fig.10 for Figure 6 Enlarged view of point D.

[0032] In the figure: 1. base; 2. fixing mechanism; 21. mobile motor; 22. mobile column; 23. bolt; 24. nut; 25. pressure sensor; 26. extrusion plate; 27. first spring; 28. sliding plate; 29. ​​first rope; 210. rubber block; 211. second spring; 212. fixed pulley; 213. support rod; 214. rubber ring; 215. movable block; 216. suction cup; 217. connecting plate; 218. storage groove; 219. rubber plate; 220. scraper; 221. third spring; 222. second rope; 223. fourth spring; 224. U-shaped rod; 225. fifth spring; 226. extrusion block; 227. fixed shell; 3. auxiliary plate; 4. adjustment mechanism; 41. fixed motor; 42. threaded rod; 43. mobile frame. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical means and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] like Figure 1 As shown, an embodiment of the present invention provides a fixing device for welding a reducer, comprising a base 1 and a fixing mechanism 2, wherein the fixing mechanism 2 is installed on one side of the upper portion of the base 1;

[0036] like Figure 1 , Figure 5 , Figure 7 , Fig. 9 and Fig.10 As shown, the fixing mechanism 2 includes a moving motor 21, a moving column 22 is fixedly installed at one end of the output shaft of the moving motor 21, an extrusion plate 26 is slidably installed on the outer wall of the moving column 22, one end of the first rope 29 is installed inside the extrusion plate 26, a support rod 213 is fixedly installed on the other end of the first rope 29, a movable block 215 is installed on one side of the support rod 213, a suction cup 216 is fixedly installed on one side of the movable block 215 for attaching and supporting the inner wall of the ventilation duct, two rubber plates 219 are symmetrically installed on the outer side of the movable block 215, and a scraper 220 is fixedly installed on the same end of the two rubber plates 219 for scraping dust off the inner wall of the ventilation duct just above the suction cup 216.

[0037] like Figure 2 and Figure 7 As shown, a bolt 23 is slidably installed inside the movable column 22, and the bolt 23 is used to fix the position of the extrusion plate 26. A nut 24 is rotatably installed on the outer wall of the bolt 23.

[0038] like Figure 7 As shown, a pressure sensor 25 is fixedly installed on the outer wall of the moving column 22 for controlling the moving distance of the moving column 22. The pressure sensor 25 is placed on the side of the bolt 23 close to the moving motor 21. The distance between the pressure sensor 25 and the bolt 23 is equal to the width of the extrusion plate 26. When the extrusion plate 26 squeezes the contact pressure sensor 25, the bolt 23 can just be inserted into the moving column 22 to fix the position of the extrusion plate 26.

[0039] like Fig.10As shown, one end of three first springs 27 are evenly distributed and fixedly installed on one side of the extrusion plate 26, and a sliding plate 28 is fixedly installed on the other end of the first spring 27. The first spring 27 is used for resetting the sliding plate 28, and a first rope 29 is fixedly installed on one side of the sliding plate 28. A rubber block 210 is symmetrically installed for rotation inside the extrusion plate 26, and the first rope 29 is slidably installed between the two rubber blocks 210. One end of the second spring 211 is fixedly installed on one side of the two rubber blocks 210 away from each other. The second spring 211 is used to squeeze the rubber block 210, so that the rubber block 210 always fits and squeezes the first rope 29, thereby increasing the friction between the rubber block 210 and the first rope 29, and the other ends of the two second springs 211 are fixedly installed on one side of the extrusion plate 26.

[0040] like Figure 6 As shown, three support rods 213 are evenly distributed and hinged at one end of the movable column 22, three fixed pulleys 212 are evenly distributed and fixedly installed on the outer wall of the movable column 22, and rubber rings 214 are movably installed inside the three support rods 213 for resetting the support rods 213.

[0041] like Figure 3 , Figure 4 , Figure 5 , Figure 8 and Fig. 9 As shown, a movable block 215 is hinged on one side of the support rod 213, a suction cup 216 is fixedly installed on one side of the movable block 215, connecting plates 217 are fixedly installed on both symmetrical sides of the movable block 215, and a receiving groove 218 is fixedly installed on one side of the two connecting plates 217 away from each other, one end of the third spring 221 is fixedly installed on one side of the storage groove 218, and a rubber plate 219 is fixedly installed on the other end of the third spring 221. The third spring 221 is used for resetting the rubber plate 219, and the rubber plate 219 is slidably installed in the storage groove 218. The two ends of the opposite sides of the bottom of the two rubber plates 219 are fixedly installed with the third spring 221. Two ropes 222, the lower surfaces of the ends of the two second ropes 222 placed at the same end of the two rubber plates 219 are fixedly installed with a U-shaped rod 224, the end of the U-shaped rod 224 away from the second rope 222 is fixedly installed with an extrusion block 226, both ends of the movable block 215 are fixedly installed with a fixed shell 227, one end of the bottom side of the fixed shell 227 is fixedly installed with one end of the fifth spring 225 for resetting the U-shaped rod 224 and the extrusion block 226, the other end of the fifth spring 225 is fixedly installed on one side of the bottom of the extrusion block 226, and the fifth spring 225 is slidably sleeved on the outer wall of the U-shaped rod 224.

[0042] like Figure 6As shown, one end of a fourth spring 223 is fixedly installed at the bottom of one side of the three movable blocks 215 close to each other, which is used for resetting the movable block 215 and keeping the movable block 215 basically parallel to the support rod 213 when not working, to prevent the movable block 215 from rotating excessively and causing one end to tilt up, affecting its use. The other end of the fourth spring 223 is fixedly installed on the side of the support rod 213 that is closest to it.

[0043] like Figure 1 As shown, an auxiliary plate 3 is fixedly installed in the middle of the base 1, and the top of the auxiliary plate 3 is arc-shaped.

[0044] like Figure 1 and Figure 2 As shown, an adjusting mechanism 4 is installed inside the base 1, and the adjusting mechanism 4 includes two fixed motors 41. The fixed motors 41 are fixedly installed on both symmetrical sides of the base 1, and one end of the output shaft of the fixed motor 41 is fixedly installed with one end of a threaded rod 42, and the other end of the threaded rod 42 is rotatably installed on one side of the auxiliary plate 3, and a movable frame 43 is engaged with the outer wall of the threaded rod 42.

[0045] How it works:

[0046] First weld the thin ventilation duct and the thin end of the reducer: Figure 1 For example, the staff places one end of the thin ventilation duct and the thin end of the reducer on the auxiliary plate 3 from left to right, while keeping the ventilation duct and the reducer horizontal, and starts the fixed motor 41. The fixed motor 41 rotates to drive the threaded rod 42 to rotate, thereby driving the two moving frames 43 to move toward each other, thereby driving the two fixing mechanisms 2 to contact the thin ventilation duct and the thick end of the reducer respectively, so that the thin ventilation duct and the thin end of the reducer are in contact and pressed tightly;

[0047] The left support rod 213 first enters the thin ventilation duct, and when the extrusion plate 26 contacts and squeezes the thin ventilation duct, the staff can loosen the thin ventilation duct. After the extrusion plate 26 contacts and squeezes the thin ventilation duct, it is stopped from moving forward, and the moving column 22 continues to move to the right, driving the first rope 29 to move to the right, and the two second springs 211 squeeze the rubber block 210 to clamp the first rope 29. The first rope 29 pulls the three support rods 213 to rotate and open, thereby driving the three movable blocks 215, the suction cup 216, the rubber plate 219 and the scraper 220 to rotate and open. The left ends of the two scrapers 220 located at the upper part first contact the inner wall of the thin ventilation duct, and then as the movable block 215 continues to rise, one side of the blade of the scraper 220 is all attached to the inner wall of the thin ventilation duct. As the three support rods 213 continue to open, one side of the blade of the four scrapers 220 on the two outer sides is all attached to the inner wall of the thin ventilation duct. At this time, the tips of the six extrusion blocks 226 are all attached to the inner wall of the thin ventilation duct.

[0048] The support rod 213 on the right side first enters the thick end of the reducer, and the extrusion plate 26 is stopped from moving forward after contacting and extruding the thick end of the reducer. The moving column 22 continues to move to the left, driving the first rope 29 to move to the left, and the two second springs 211 squeeze the rubber block 210 to clamp the first rope 29. The first rope 29 pulls the three support rods 213 to rotate and open, thereby driving the three movable blocks 215, the suction cup 216, the rubber plate 219 and the scraper 220 to rotate and open. One end of the two scrapers 220 located at the upper part first contacts the inner wall of the reducer, and then as the movable block 215 continues to rise, one side of the blade of the scraper 220 is completely attached to the inner wall of the reducer. As the three support rods 213 continue to open, one side of the blade of the four scrapers 220 on the two outer sides is completely attached to the inner wall of the reducer. At this time, the tips of the six extrusion blocks 226 are all attached to the inner wall of the reducer.

[0049] The subsequent clamping process is the same for both: the three support rods 213 continue to rotate and open, the extrusion block 226 is squeezed by the inner wall of the thin ventilation duct (or reducer) into the fixed shell 227, and squeezes the U-shaped rod 224 and the fifth spring 225 downward. The U-shaped rod 224 moves downward to drive the second rope 222 to move downward, thereby driving the rubber plate 219 to move downward into the storage groove 218 and squeeze the third spring 221. The rubber plate 219 drives the scraper 220 to move in line with the inner wall of the thin ventilation duct (or reducer) to scrape off the dust on the inner wall of the thin ventilation duct (or reducer) just above the movable block 215, and then the suction cup 216 contacts and squeezes the inner wall of the thin ventilation duct (or reducer). When the extrusion plate 26 contacts the extrusion pressure sensor 25, the fixed motor 41 stops rotating, and the staff inserts the bolt 23 into the reserved hole of the movable column 22, and screws on the nut 24 to lock the position of the extrusion plate 26.

[0050] When the thick end of the reducer and the thin ventilation duct are clamped, the two moving motors 21 are started to drive the reducer and the ventilation duct to rotate, and the staff starts welding.

[0051] After welding, the staff pulls out the right bolt 23, and the right fixing mechanism 2 relaxes: the right fixing motor 41 rotates in the opposite direction to drive the right threaded rod 42 to rotate in the opposite direction, thereby driving the right moving frame 43 to move in the opposite direction, and the right extrusion plate 26 moves to the right under the tension of the first rope 29, so that the right suction cup 216 no longer fits the reducer, the support rod 213 is reset under the action of the rubber ring 214, the extrusion block 226 is reset under the tension of the fifth spring 225, the rubber plate 219 is reset under the tension of the third spring 221, and the movable block 215 is reset under the pulling force of the fourth spring 223.

[0052] The staff starts the fixed motor 41 on the left side in reverse, driving the left threaded rod 42 to rotate in reverse, thereby driving the left movable frame 43 to move in reverse, driving the welded reducer and the thin ventilation duct to move synchronously, so that the thick end of the reducer moves to the auxiliary plate 3, and then the thick ventilation duct is placed on the auxiliary plate 3, and the welding operation of the thick end of the reducer and the thick ventilation duct is carried out.

[0053] When the inner diameter of the ventilation duct (or reducer) is small, the opening range of the support rod 213 is small, so that the suction cup 216 can contact and fit the inner wall of the ventilation duct (or reducer). At this time, the extrusion plate 26 continues to move backward to increase the force of the first rope 29, thereby increasing the force of the suction cup 216 squeezing the inner wall of the ventilation duct (or reducer). When the tension of the first rope 29 is greater than the squeezing and friction force of the two rubber blocks 210 on it, it will drive the sliding plate 28 to move toward the rubber block 210, that is, extend the length of the first rope 29 between the rubber block 210 and the support rod 213, thereby reducing the tension of the first rope 29, thereby preventing the suction cup 216 from excessively squeezing the inner wall of the ventilation duct (or reducer) and preventing the ventilation duct (or reducer) from deformation.

[0054] In the description of the present invention, it is necessary to understand that the terms "center", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fixing device for welding a reducing joint, comprising a base (1) and a fixing mechanism (2), characterized in that: A fixing mechanism (2) is installed on one side of the upper portion of the base (1); The fixing mechanism (2) comprises a moving motor (21), a moving column (22) is fixedly mounted on one end of the output shaft of the moving motor (21), an extrusion plate (26) is slidably mounted on the outer wall of the moving column (22), one end of a first rope (29) is mounted inside the extrusion plate (26), a support rod (213) is fixedly mounted on the other end of the first rope (29), a movable block (215) is mounted on one side of the support rod (213), a suction cup (216) is fixedly mounted on one side of the movable block (215), two rubber plates (219) are symmetrically mounted on the outer periphery of the movable block (215), and a scraper (220) is fixedly mounted on the same end of the two rubber plates (219); One end of three first springs (27) are evenly distributed and fixedly installed on one side of the extrusion plate (26); a sliding plate (28) is fixedly installed on the other end of the first spring (27); a first rope (29) is fixedly installed on one side of the sliding plate (28); a rubber block (210) is symmetrically rotated and installed inside the extrusion plate (26); the first rope (29) is slidably installed between two rubber blocks (210); one end of a second spring (211) is fixedly installed on one side of the two rubber blocks (210) away from each other; the other ends of the two second springs (211) are fixedly installed on one side of the extrusion plate (26); One end of the movable column (22) is evenly distributed and hinged with three support rods (213); the outer wall of the movable column (22) is evenly distributed and fixedly installed with three fixed pulleys (212); and a rubber ring (214) is movably installed inside the three support rods (213); A movable block (215) is hingedly connected to one side of the support rod (213), a suction cup (216) is fixedly installed on one side of the movable block (215), connecting plates (217) are fixedly installed on both symmetrical sides of the movable block (215), and a receiving groove (218) is fixedly installed on one side of the two connecting plates (217) away from each other, one end of a third spring (221) is fixedly installed on one side inside the receiving groove (218), and a rubber plate (219) is fixedly installed on the other end of the third spring (221), and the rubber plate (219) is slidably installed inside the receiving groove (218), and two opposite sides of the bottom of the two rubber plates (219) are fixedly installed at both ends. The second rope (222), the lower surfaces of the ends of the two second ropes (222) placed at the same end of the two rubber plates (219) are fixedly mounted with a U-shaped rod (224), one end of the U-shaped rod (224) away from the second rope (222) is fixedly mounted with an extrusion block (226), both ends of the movable block (215) are fixedly mounted with a fixed shell (227), one end of the fifth spring (225) is fixedly mounted on one side of the bottom of the fixed shell (227), the other end of the fifth spring (225) is fixedly mounted on one side of the bottom of the extrusion block (226), and the fifth spring (225) is slidably sleeved on the outer side wall of the U-shaped rod (224).

2. A fixing device for welding a reducing joint according to claim 1, characterized in that: A bolt (23) is slidably installed inside the movable column (22), and a nut (24) is rotatably installed on the outer wall of the bolt (23).

3. A fixing device for welding a reducing joint according to claim 1, characterized in that: A pressure sensor (25) is fixedly mounted on the outer wall of the moving column (22). The pressure sensor (25) is placed on a side of the bolt (23) close to the moving motor (21). The distance between the pressure sensor (25) and the bolt (23) is equal to the width of the extrusion plate (26).

4. A fixing device for welding a reducing joint according to claim 1, characterized in that: One end of a fourth spring (223) is fixedly mounted on the bottom of one side of the three movable blocks (215) close to each other, and the other end of the fourth spring (223) is fixedly mounted on the side of the closest support rod (213).

5. A fixing device for welding a reducing joint according to claim 1, characterized in that: An auxiliary plate (3) is fixedly mounted in the middle of the base (1), and the top of the auxiliary plate (3) is arc-shaped.

6. A fixing device for welding a reducing joint according to claim 1, characterized in that: An adjusting mechanism (4) is installed inside the base (1), and the adjusting mechanism (4) comprises two fixed motors (41). The fixed motors (41) are fixedly installed on both symmetrical sides of the base (1), one end of the output shaft of the fixed motor (41) is fixedly installed with one end of a threaded rod (42), the other end of the threaded rod (42) is rotatably installed on one side of the auxiliary plate (3), and a movable frame (43) is engaged and installed on the outer wall of the threaded rod (42).

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