CN115476101A - Fixing device for welding joints with different diameters - Google Patents

Abstract

The invention relates to the technical field of metal welding, in particular to a fixing device for welding joints with different diameters, including a base and a fixing mechanism, and a fixing mechanism is installed on one side of the upper part of the base; the fixing mechanism includes a moving motor, and the moving One end of the output shaft of the motor is fixedly installed with a moving column, the outer wall of the moving column is slidably installed with an extruding plate, the inside of the extruding plate is installed with a first rope, and the other end of the first rope is fixedly installed with a strut. A movable block is installed on one side of the strut, and a suction cup is fixedly installed on one side of the movable block, and two rubber plates are symmetrically installed on the outer circumference 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 completely fit in contact with the inner wall of the different-diameter joint to ensure the supporting area, prevent the deformation of the different-diameter joint caused by the small supporting area, and ensure To ensure the stability of subsequent welding operations.

Description

Fixing device for welding joints with different diameters

technical field

The invention relates to the technical field of metal welding, in particular to a fixing device for welding joints with different diameters.

Background technique

Different-diameter joints are also called different-diameter pipes, commonly known as big and small heads, and are one of chemical pipeline fittings. They are used for the connection of two different pipe diameters. The material can be classified into stainless steel, alloy steel, carbon steel, etc. According to the connection form, there are welded reducer joints, inner wire reducer joints, outer wire reducer joints, etc.

Different diameter joints are widely used, mainly used in dairy products, food, beer, beverages, pharmaceuticals, cosmetics, automobiles, shipbuilding and other industrial fields and civil construction fields.

When the circular ventilation pipe is changed in diameter, it is necessary to weld a different diameter joint between two sections of ventilation pipes with different diameters (here the different diameter joint is in the shape of a trumpet). During welding, the staff clamps and fixes the ventilation pipe and the different-diameter joint, then brings the spliced ends close to each other, and then performs welding. When fixing the ventilation pipe, most of the existing clamps are used to clamp the end of the ventilation pipe from the outside, and the fixture is difficult. It fits the side wall of the trumpet-shaped reducing joint. This kind of workpiece is difficult to be fixed. The contact area between the fixture and the trumpet-shaped reducing joint is small, which may lead to unstable clamping, which is not conducive to subsequent welding operations, and the thickness of the ventilation pipe Thinner (for example: the thickness of low-pressure and medium-pressure ventilation pipes is about 0.5 mm, and the thickness of high-pressure ventilation pipes is about 0.75 mm), the external clamps are easy to squeeze and deform the ventilation pipes, and the diameter of the ventilation pipes is also biased. Large, the external clamping fixture occupies a large area. For long-length ventilation pipes, the stability of the clamping method at the clamping end is deviated, which is likely to cause welding shaking errors.

Contents of the invention

To achieve the above object, the present invention is achieved through the following technical solutions:

The invention proposes a fixing device for welding joints with different diameters, which includes a base and a fixing mechanism, and the fixing mechanism is installed on one side of the upper part of the base;

The fixing mechanism includes a moving motor, one end of the output shaft of the moving motor is fixedly installed with a moving column, the outer wall of the moving column is slidably installed with an extruding plate, and one end of the first rope is installed inside the extruding plate. The other end of the first rope is fixedly installed with a strut, and a movable block is installed on one side of the strut, and a suction cup is fixedly installed on one side of the movable block, and two rubber plates are symmetrically installed on the outer circumference of the movable block. The same end of the rubber plate is fixedly equipped with a scraper.

Further, bolts are slidably installed inside the moving column, and nuts are installed on the outer wall of the bolts for engagement and rotation.

Further, a pressure sensor is fixedly installed on the outer wall of the moving column, the pressure sensor is placed on the 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.

Further, one end of three first springs is evenly distributed and fixedly installed on one side inside the extrusion plate, a sliding plate is fixedly installed on the other end of the first spring, and a first rope is fixedly installed on one side of the sliding plate, so A rubber block is mounted on the inside of the extrusion plate for symmetrical rotation, a first rope is slidably installed between the two rubber blocks, and one end of a second spring is fixedly installed on the side of the two rubber blocks away from each other. The other ends of the second springs are fixedly installed on one side of the extrusion plate.

Further, three struts are evenly distributed and hinged at one end of the moving column, three fixed pulleys are evenly distributed and fixedly installed on the outer wall of the moving column, and rubber rings are movably installed inside the three struts.

Further, a movable block is hinged on one side of the strut, a suction cup is fixedly installed on one side of the movable block, connecting plates are fixedly installed on both symmetrical sides of the movable block, and the two connecting plates are far away from each other. A storage tank is fixedly installed, one end of the third spring is fixedly installed on one side of the storage tank, and a rubber plate is fixedly installed on the other end of the third spring, and the rubber plate is slidably installed inside the storage tank. Both ends of the opposite sides of the bottom of the rubber plate are fixedly installed with second ropes, and the lower surfaces of the ends of the two second ropes placed at the same end of the two rubber plates are jointly fixed with a U-shaped bar, and the U-shaped bar is far away from the second rope. One end of the movable block is fixedly installed with an extruding block, both ends of the movable block are fixedly installed with a fixed shell, one end of the fifth spring is fixedly installed on one side of the inner bottom of the fixed shell, and the other end of the fifth spring is fixedly installed on the extrusion On one side of the bottom of the pressure block, the fifth spring is slidably sleeved on the outer wall of the U-shaped bar.

Further, one end of the fourth spring is fixedly installed on the bottom of the three movable blocks close to each other, and the other end of the fourth spring is fixedly installed on the side of the nearest strut.

Further, an auxiliary board is fixedly installed in the middle of the base, and the top of the auxiliary board is arc-shaped.

Further, 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, and one end of the output shaft of the fixed motor is fixedly installed with one end of a threaded rod. The other end of the threaded rod is rotatably mounted on one side of the auxiliary plate, and the outer wall of the threaded rod is engaged with a moving frame.

The beneficial effects of the present invention are as follows:

(1) In the fixing device for welding different-diameter joints according to the present invention, the movable block is hinged on the support bar, so that the movable block can rotate on the support bar, and can completely fit in contact with the inner wall of the different-diameter joint, ensuring The support area prevents the deformation of the different-diameter joint caused by the small support area, and ensures the stability of the subsequent welding operation;

The three support rods rotate and open, and the rubber plate drives the scraper to move against the inner wall of the ventilation pipe (or different diameter joint), scraping off the dust on the inner wall of the ventilation pipe (or different diameter joint) directly above the movable block, and then the suction cup contacts and squeezes Press and fit the inner wall of the ventilation pipe (or joint with different diameters). Compared with the rigid support in the prior art, the soft suction cup has greater friction with the inner wall of the ventilation pipe (or joint with different diameters), and the support is more stable. The inner wall of the pipe (or different diameter joint) is supported and fixed, and it is not easy to deform the ventilation pipe (or different diameter joint). The inner wall of the pipe (or different-diameter joint) is more firmly adsorbed, further enhancing the support stability, so that the ventilation pipe (or different-diameter joint) reduces the possibility of misalignment, sliding and shaking during welding, and improves the welding quality;

Start two mobile motors to drive the fixed different diameter joints to rotate synchronously with the ventilation pipes, and the staff starts welding. The different diameter joints and the ventilation pipes rotate synchronously so that the welding place is always in a fixed position, which is more convenient for the staff to weld.

(2) In the fixing device for welding different-diameter joints according to the present invention, when the inner diameter of the ventilation duct is small, the opening range of the struts is small so that the suction cup can contact and fit the inner wall of the ventilation duct (or the different-diameter joint). When the extrusion plate continues to move backward, the strength of the first rope increases, which in turn makes the force of the suction cup squeeze the inner wall of the ventilation pipe (or different diameter joint) larger. When the pulling force of the first rope is greater than that of the two rubber blocks When the pressure and friction are applied, the sliding plate will be driven to move towards the rubber block, that is, the length of the first rope between the rubber block and the strut will be extended, thereby reducing the tension of the first rope, thereby preventing the suction cup from excessively squeezing the ventilation duct ( or different diameter joints) inner wall to prevent deformation of ventilation pipes (or different diameter joints).

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of the overall structure of a fixing device for welding a different-diameter joint provided by the present invention;

Fig. 2 is a schematic diagram of connection of a mobile motor of a fixing device for welding a different-diameter joint provided by the present invention;

Fig. 3 is a schematic diagram of extrusion block connection of a fixing device for welding different-diameter joints provided by the present invention;

Fig. 4 is a schematic diagram of the third spring connection of a fixing device for welding a different-diameter joint provided by the present invention;

Fig. 5 is a schematic diagram of suction cup connection of a fixing device for welding different diameter joints provided by the present invention;

Fig. 6 is a schematic diagram of the internal structure of the extruded plate of a fixing device for welding different-diameter joints provided by the present invention;

Figure 7 is an enlarged view of A in Figure 2;

Fig. 8 is an enlarged view at B of Fig. 3;

Fig. 9 is an enlarged view at C of Fig. 4;

FIG. 10 is an enlarged view of D in FIG. 6 .

In the figure: 1, base; 2, fixing mechanism; 21, moving motor; 22, moving column; 23, bolt; 24, nut; 25, pressure sensor; 26, extrusion plate; 27, first spring; 28, sliding 29, the first rope; 210, the rubber block; 211, the second spring; 212, the fixed pulley; 213, the strut; 214, the rubber ring; 215, the movable block; 216, the sucker; 219, rubber plate; 220, scraper; 221, the third spring; 222, the second rope; 223, the fourth spring; 224, U-shaped bar; 225, the fifth spring; 226, extrusion block; 227, 3. Auxiliary plate; 4. Adjusting mechanism; 41. Fixed motor; 42. Threaded rod; 43. Moving frame.

detailed description

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 clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

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

As shown in Figure 1, an embodiment of the present invention provides a fixing device for welding different diameter joints, including a base 1 and a fixing mechanism 2, and the fixing mechanism 2 is installed on the upper side of the base 1;

As shown in Fig. 1, Fig. 5, Fig. 7, Fig. 9 and Fig. 10, the fixed mechanism 2 includes a moving motor 21, one end of the output shaft of the moving motor 21 is fixedly installed with a moving column 22, and the outer wall of the moving column 22 is slidably installed with an extrusion plate 26. One end of the first rope 29 is installed inside the extrusion plate 26, and the other end of the first rope 29 is fixedly installed with a strut 213. A movable block 215 is installed on one side of the strut 213, and a suction cup 216 is fixedly installed on one side of the movable block 215. , for attaching and supporting the inner side wall of the ventilation duct, two rubber plates 219 are symmetrically installed on the outer circumference of the movable block 215, and a scraper 220 is fixedly installed at the same end of the two rubber plates 219 for scraping off the ventilation directly above the suction cup 216 Dust on the inner wall of the pipe.

As shown in FIG. 2 and FIG. 7 , bolts 23 are slidably installed inside the moving column 22 , and the bolts 23 are used to fix the position of the extrusion plate 26 , and nuts 24 are mounted on the outer wall of the bolts 23 to engage and rotate.

As shown in Figure 7, a pressure sensor 25 is fixedly installed on the outer wall of the moving column 22, which is used to control 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 them is equal to the width of the extruding plate 26. When the extruding plate 26 extrudes and contacts the pressure sensor 25, the bolt 23 can just be inserted into the moving column 22 to fix the position of the extruding plate 26.

As shown in Figure 10, one end of three first springs 27 is evenly distributed and fixedly installed on one side of the inner side of the extrusion plate 26, and the other end of the first spring 27 is fixedly installed with a sliding plate 28, and the first spring 27 is used for the reset of the sliding plate 28 A first rope 29 is fixedly installed on one side of the sliding plate 28, a rubber block 210 is installed symmetrically rotating inside the extrusion plate 26, and a first rope 29 is slidably installed between the two rubber blocks 210, and the two rubber blocks 210 are far away from each other by a distance. One end of the second spring 211 is fixedly installed on both sides, and 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, increasing the friction between the rubber block 210 and the first rope 29 force, the other ends of the two second springs 211 are fixedly installed on one side of the extrusion plate 26 .

As shown in Figure 6, three struts 213 are evenly distributed and hinged at one end of the moving column 22, and three fixed pulleys 212 are evenly distributed and fixedly installed on the outer wall of the moving column 22, and rubber rings 214 are installed for common movement inside the three struts 213, for The reset of strut 213.

As shown in Figure 3, Figure 4, Figure 5, Figure 8 and Figure 9, a movable block 215 is hinged on one side of the strut 213, a suction cup 216 is fixedly installed on one side of the movable block 215, and a suction cup 216 is fixedly installed on both symmetrical sides of the movable block 215. The connecting plate 217, the two connecting plates 217 are fixedly installed with a receiving groove 218 on the side away from each other, one end of the third spring 221 is fixedly installed on the inner side of the receiving groove 218, and the other end of the third spring 221 is fixedly installed with a rubber plate 219, The third spring 221 is used for the reset of the rubber plate 219, and the rubber plate 219 is slidably installed inside the receiving groove 218, and the two opposite ends of the bottom of the two rubber plates 219 are fixedly equipped with second ropes 222, placed between the two said rubber plates 219. The lower surfaces of the ends of the two second ropes 222 at the same end of the rubber plate 219 are jointly fixed with a U-shaped bar 224, and the end of the U-shaped bar 224 away from the second rope 222 is fixedly installed with an extrusion block 226, and the two ends of the movable block 215 are fixed. A fixed housing 227 is fixedly installed, and one end of the fifth spring 225 is fixedly installed on one side of the inner bottom of the fixed housing 227, which is used for resetting the U-shaped bar 224 and the extrusion block 226, and the other end of the fifth spring 225 is fixedly installed on the extrusion block On the bottom side of 226 , the fifth spring 225 is slidably sleeved on the outer wall of the U-shaped bar 224 .

As shown in Figure 6, one end of the fourth spring 223 is fixedly installed on the bottom of the three movable blocks 215 close to each other, which is used for the reset of the movable block 215, and keeps the movable block 215 basically with the strut 213 when not working. Parallel to prevent the movable block 215 from over-rotating so that one end is tilted, affecting the use, and the other ends of the fourth spring 223 are fixedly installed on the side of the nearest strut 213 .

As shown in FIG. 1 , an auxiliary board 3 is fixedly installed in the middle of the base 1 , and the top of the auxiliary board 3 is arc-shaped.

As shown in Figures 1 and 2, an adjustment mechanism 4 is installed inside the base 1, the adjustment mechanism 4 includes two fixed motors 41, the two symmetrical sides of the base 1 are fixedly installed with fixed motors 41, and one end of the output shaft of the fixed motor 41 is fixedly installed with One end of the threaded rod 42 and the other end of the threaded rod 42 are rotatably mounted on one side of the auxiliary plate 3 , and the outer wall of the threaded rod 42 is engaged with a moving frame 43 installed thereon.

Specific working methods:

Weld the thin ventilation pipe and the thin end of the reducing joint first: Take Figure 1 as an example, the staff places one end of the thin ventilation pipe and the thin end of the reducing joint on the auxiliary plate 3 from left to right, while keeping the ventilation pipe and the reducing joint Keep the level, start the fixed motor 41, the rotation of the fixed motor 41 drives the threaded rod 42 to rotate, thereby driving the two moving frames 43 to move towards each other, thereby driving the two fixing mechanisms 2 to contact the thin ventilation pipe and the thick end of the reducing joint respectively, so that the fine ventilation The pipe is in tight contact with the thin end of the reducing joint;

The strut 213 on the left side first enters the inside of the thin air duct. When the extruded plate 26 contacts the extruded thin air duct, the staff can loosen the thin air duct, and the extruded plate 26 is prevented from advancing , the moving column 22 continues to move to the right, driving the first rope 29 to move to the right, two second springs 211 squeeze the rubber block 210 to clamp the first rope 29, and the first rope 29 pulls the three struts 213 to rotate open, thereby driving three movable blocks 215, suction cups 216, rubber plates 219 and scrapers 220 to rotate and open, and the left end of the two scrapers 220 on the upper part first contacts the inner side wall of the fine ventilation duct, and then continues to rise with the movable block 215, One side of the edge of the scraper 220 is all attached to the inner wall of the thin ventilation duct, and as the three struts 213 continue to open, the sides of the edges of the four scrapers 220 on the two outer sides are all attached to the inner wall of the thin ventilation duct. The tips of the extrusion block 226 are all attached to the inner sidewall of the fine ventilation duct;

The strut 213 on the right side enters the thick end of the different-diameter joint first, and the extrusion plate 26 contacts and squeezes the thick end of the different-diameter joint and is prevented from advancing. The moving column 22 continues to move to the left, driving the first rope 29 to move to the left. Two second springs 211 squeeze the rubber block 210 to clamp the first rope 29, and the first rope 29 pulls the three struts 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 Open, one end of the two scrapers 220 located on the upper part first touches the inner wall of the different diameter joint, and then continues to rise with the movable block 215, and the side of the blade of the scraper 220 is all attached to the inner wall of the different diameter joint, along with the three struts 213 Continue to open, and the edges of the four scrapers 220 on the two outer sides are all attached to the inner wall of the different-diameter joint, and at this time, the tips of the six extrusion blocks 226 are all attached to the inner wall of the different-diameter joint;

The subsequent clamping process is the same: the three struts 213 continue to rotate and open, the extruding block 226 is extruded into the inside of the fixed shell 227 by the inner wall of the thin ventilation pipe (or different diameter joint), and the U-shaped bar is extruded downward 224 and the fifth spring 225, the U-shaped rod 224 moves down to drive the second rope 222 to move down, thereby driving the rubber plate 219 to move down into the storage groove 218 and squeeze the third spring 221, and the rubber plate 219 drives the scraper 220 to fit the fine ventilation The inner wall of the pipe (or joint with different diameter) moves to scrape off the dust on the inner wall of the thin ventilation pipe (or joint with different diameter) directly above the movable block 215, and then the suction cup 216 contacts and squeezes the thin air duct (or joint with different diameter) On the inner side wall, 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 moving column 22, and screws on the nut 24 to lock the position of the extrusion plate 26.

When the thick end of the different diameter joint and the thin air duct are all clamped, start two mobile motors 21 to drive the different diameter joint and the air duct to rotate, and the staff starts welding.

After the welding is finished, the staff pulls out the right side bolt 23, and the relaxation process of the right side fixing mechanism 2: the right side fixing motor 41 reversely rotates to drive the right side threaded rod 42 to reversely rotate, thereby driving the right side moving frame 43 to move backwardly, The right squeeze 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 different-diameter joint, the strut 213 resets under the action of the rubber ring 214, and the squeeze block 226 The fifth spring 225 resets under the tension, the rubber plate 219 resets under the third spring 221 tension, and the movable block 215 resets under the fourth spring 223 tension.

The staff reversely starts the fixed motor 41 on the left side, drives the left threaded rod 42 to rotate in the reverse direction, thereby drives the left moving frame 43 to move in the reverse direction, and drives the welded different-diameter joint to move synchronously with the thin ventilation pipe, so that the different-diameter The butt end of the joint is moved to the auxiliary plate 3, and then the rough ventilation pipe is placed on the auxiliary plate 3 to carry out the welding operation between the butt end of the different diameter joint and the rough air duct.

When the inner diameter of the ventilation pipe (or different-diameter joint) is small, the opening range of the strut 213 is small so that the suction cup 216 can contact and fit the inner wall of the ventilation pipe (or different-diameter joint). At this time, the extrusion plate 26 continues to move backward so that the first The strength of a rope 29 increases, and then the force of the suction cup 216 squeezing the inner wall of the ventilation pipe (or different diameter joint) becomes larger. When the pulling force of the first rope 29 is greater than the extrusion and frictional force of the two rubber blocks 210 , will drive the sliding plate 28 to move towards the rubber block 210, that is, extend the length of the first rope 29 between the rubber block 210 and the strut 213, thereby reducing the tension of the first rope 29, thereby reducing excessive extrusion of the suction cup 216 and ventilation The inner wall of the pipe (or reducing joint) prevents the deformation of the ventilation pipe (or reducing joint).

In describing the present invention, it is to be understood that the terms "center", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or be configured in a specific orientation. and operation, and therefore cannot be construed as limiting the protection scope of the present invention.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. The utility model provides a reducing connects fixing device for welding, includes base (1) and fixed establishment (2), its characterized in that: a fixing mechanism (2) is arranged on one side of the upper part of the base (1);

fixed establishment (2) are including moving motor (21), moving motor (21) output shaft one end fixed mounting has removal post (22), it has stripper plate (26) to move post (22) lateral wall slidable mounting, stripper plate (26) internally mounted has the one end of first rope (29), first rope (29) other end fixed mounting has vaulting pole (213), movable block (215) is installed to vaulting pole (213) one side, movable block (215) one side fixed mounting has sucking disc (216), two rubber slab (219) are installed to movable block (215) outside enclosing the symmetry, two the equal fixed mounting of the same one end of rubber slab (219) has scraper (220).

2. The reducing joint fixing device for welding according to claim 1, wherein: the inner part of the moving column (22) is provided with a bolt (23) in a penetrating and sliding mode, and the outer side wall of the bolt (23) is provided with a nut (24) in a meshing and rotating mode.

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

4. The reducing joint fixing device for welding according to claim 1, wherein: the rubber block pressing device is characterized in that one end of three first springs (27) is uniformly distributed and fixedly mounted on one side inside the pressing plate (26), a sliding plate (28) is fixedly mounted on the other end of each first spring (27), a first rope (29) is fixedly mounted on one side of the sliding plate (28), rubber blocks (210) are symmetrically and rotatably mounted inside the pressing plate (26), two first ropes (29) are slidably mounted between the rubber blocks (210), two rubber blocks (210) are mutually far away from one end of one side, where each second spring (211) is fixedly mounted, and the other end of each second spring (211) is fixedly mounted on one side inside the pressing plate (26).

5. The reducing joint fixing device for welding according to claim 1, wherein: it has three vaulting pole (213) to move post (22) one end evenly distributed and articulate, it has three fixed pulley (212), three to move post (22) lateral wall evenly distributed fixed mounting the inside common movable mounting of vaulting pole (213) has rubber circle (214).

6. The fixing device for welding the reducing joint according to claim 1, wherein: vaulting pole (213) one side articulates there is movable block (215), movable block (215) one side fixed mounting has sucking disc (216), the equal fixed mounting in two symmetrical sides of movable block (215) has connecting plate (217), two connecting plate (217) keep away from the equal fixed mounting in one side each other and accomodate groove (218), accomodate the one end of groove (218) inside one side fixed mounting third spring (221), third spring (221) other end fixed mounting has rubber slab (219), rubber slab (219) slidable mounting is inside accomodating groove (218), two the equal fixed mounting in rubber slab (219) bottom opposite side both ends has second rope (222), arranges two rubber slab (219) two second rope (222) tip lower surface common fixed mounting of same end has U shaped rod (224), the one end fixed mounting that second rope (222) was kept away from to U shaped rod (224) has extrusion block (226), the equal fixed mounting in movable block (215) both ends has fixed housing (227), the inside one side fixed mounting in bottom of fixed housing (227) has fifth spring (225), the one end fixed mounting is in fifth spring (225) one side of sliding housing (225) first side extrusion block (225), extrusion block (225) is in the other side of sliding spring (225).

7. The reducing joint fixing device for welding according to claim 1, wherein: the three movable blocks (215) are close to one side of each other, the bottom of each movable block is fixedly provided with one end of a fourth spring (223), and the other end of each fourth spring (223) is fixedly arranged on one side of the support rod (213) which is closest to the movable block.

8. The fixing device for welding the reducing joint according to claim 1, wherein: 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.

9. The reducing joint fixing device for welding according to claim 1, wherein: base (1) internally mounted has adjustment mechanism (4), adjustment mechanism (4) include two fixed electrical machines (41), the equal fixed mounting in base (1) two symmetrical sides has fixed electrical machines (41), fixed electrical machines (41) output shaft one end fixed mounting has the one end of threaded rod (42), threaded rod (42) other end is rotated and is installed in accessory plate (3) one side, threaded rod (42) lateral wall meshing is installed and is removed frame (43).

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