A high-efficiency H-beam welding device and welding method

Abstract

The present invention discloses an H-beam efficient welding device and welding method, which specifically relates to the field of steel processing technology, including support frames, wherein the number of the support frames is four, and the opposing surfaces of the two support frames on the left side and the two support frames on the right side are fixedly connected with retaining frames, and the opposing surfaces of the two retaining frames are fixedly connected with two fixing frames. The present invention arranges a driving device, a clamping block, a reinforcing rod, a worm, a positioning block and a clamping plate, so that the two H-beams are both in a horizontal position at the center of the welding device, so that when welding the H-beam, only the driving motor needs to be started, and the welding device can fix the H-beam and adjust its horizontal position at the same time, which greatly reduces the difficulty of the welding device when welding the H-beam, avoids the situation that the welding is affected by the misalignment of the two sections of the H-beam, and ensures the welding quality and welding efficiency of the H-beam by the welding device.

Description

Technical Field

[0001] The present invention relates to the technical field of steel processing, and more specifically, to an H-shaped steel high-efficiency welding device and a welding method. Background Art

[0002] The production process of large I-beams is basically to cut the entire steel plate into webs or flanges in batches, then assemble them, and finally weld them through a welding machine. When welding I-beams, full welding is required due to the distribution of welds and welding process.

[0003] A Chinese patent document (CN113427171A) discloses a high-efficiency welding device for I-beams. In the specification, it is stated that "with the rise of entertainment facilities, I-beams are used more frequently. Existing entertainment facilities not only require vertical I-beams, but also arc-shaped I-beams such as disco and pirate ship. However, both vertical I-beams and arc-shaped I-beams require welding of the main steel plate and the side steel plate. Most of the existing welded I-beams are welded manually. After welding one side of the main steel plate, the main steel plate and the side steel plate need to be turned over. Turn to weld the other side, which not only has low welding efficiency, but also is time-consuming and labor-intensive. "At the same time, it is proposed that "by arranging a walking device and a welding gun on the moving plate corresponding to the mounting plate, it is convenient to clamp the upper and lower ends of the side steel plates in the I-beam, so that the welding gun can weld the upper and lower ends of the side steel plates of the I-beam simultaneously during automatic movement, which has high welding efficiency and is relatively time-saving and labor-saving." However, in actual use, it cannot completely solve the problem of docking when welding I-beams. Therefore, the existing I-beam welding device and the device proposed in the cited comparative case still have the following problems:

[0004] 1. During the welding process, the I-beam often needs to be fixed. However, the existing welding device needs to adjust the positions of the two I-beams while fixing the I-beam to ensure that the relative surfaces of the two I-beams are aligned. However, the alignment process of most welding devices currently needs to be observed and adjusted by the naked eye, which makes it difficult to ensure that the I-beam is in a perfect fit. As a result, after welding, the I-beam is easily misaligned, which limits the welding effect of the welding part of the I-beam.

[0005] 2. During the welding process, the joint parts of the two I-beams are in a high temperature state, and a lot of time is needed to cool down after welding to ensure the welding effect of the welding parts. Therefore, it is often difficult to ensure the processing efficiency of the I-beams simply by natural cooling, which limits the welding effect of the welding device on the I-beams. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides an H-beam high-efficiency welding device and a welding method. The technical problem to be solved by the present invention is: during the welding process, it is often necessary to fix the I-beam. However, the existing welding device needs to adjust the positions of the two sections of the I-beam while fixing the I-beam to ensure that the relative surfaces of the two sections of the I-beam are in an aligned state. However, the alignment process of most of the current welding devices needs to be observed and adjusted by the naked eye, and it is difficult to ensure that the I-beam is in a perfect fit state, resulting in the I-beam being easily misaligned after welding, which limits the welding effect of the I-beam welding part. During the welding process, the fitting parts of the two sections of the I-beam are in a high temperature state, and a lot of time is required to cool down after welding to ensure the welding effect of the welding part. Therefore, it is often difficult to ensure the processing efficiency of the I-beam simply by natural cooling, which limits the problem of the welding effect of the welding device on the I-beam.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an H-beam efficient welding device, comprising support frames, the number of the support frames is four, the opposite surfaces of the two support frames on the left side and the two support frames on the right side are fixedly connected with retaining frames, and the opposite surfaces of the two retaining frames are fixedly connected with two fixing frames, the upper surfaces of the two fixing frames are fixedly connected with the lower surfaces of the two support plates, the upper surfaces of the two support plates are clamped with locating bearings, the upper surfaces of the locating bearings are clamped with driven wheels, and the inner walls of the two driven wheels are respectively fixedly connected with the outer surfaces of the two screw nuts, the outer surfaces of the two driven wheels are wrapped with the same transmission belt, the two driven wheels are transmission-connected to the driving wheel through the transmission belt, and the upper surface of the driving wheel The cam is fixedly connected to the driving shaft below the driving device, and the lower surface of the driving device is fixedly connected to the upper surfaces of the two positioning plates respectively, and the left and right side surfaces of the two positioning plates are fixedly connected to the opposite surfaces of the two support plates respectively, the inner thread of the screw nut is connected to the first screw, the bottom end of the first screw passes through the screw nut and is fixedly connected to the top end of the first connecting rod, the bottom end of the first connecting rod is fixedly connected to the top end of the rotating device, the outer surface of the rotating device is clamped with two clamping blocks, and the outer surfaces of the two clamping blocks are fixedly connected with reinforcement rods, and the lower surfaces of the two reinforcement rods are fixedly connected to the top ends of the two fixing rods respectively, the bottom end of the fixing rod is fixedly connected to the upper surface of the positioning block, and the thread directions of the two first screws are opposite.

[0008] As a further solution of the present invention: the bottom end of the rotating device is fixedly connected to the top end of the worm, the outer surface of the worm is threadedly connected to two turbines, and the sides of the two turbines away from each other are respectively fixedly connected to one end of the opposite sides of two second screw rods, and the outer surfaces of the two second screw rods are threadedly connected to threaded barrels.

[0009] As a further solution of the present invention: a fixing sleeve is fixedly connected to the outer surface of the threaded cylinder, and two connecting plates are fixedly connected to the outer surface of the fixing sleeve. The fixing sleeve is fixedly connected to the front side of the clamping plate through the two connecting plates, and the front side of the clamping plate and the back side of the positioning block are clamped with each other, and the upper surfaces of the two positioning blocks are fixedly connected to the lower surface of the support plate through a telescopic rod.

[0010] As a further solution of the present invention: the outer surface of the second screw rod is sleeved with a second bearing, the second bearing is clamped on the front side of the first bracket, and the lower surface of the first bracket is fixedly connected to the lower surface of the inner wall of the positioning block.

[0011] As a further solution of the present invention: the front side of the turbine is fixedly connected to one end of the back side of the second bearing, the outer surface of the second bearing is sleeved with a third bearing, the third bearing is clamped on the back side of the second bracket, and the lower surface of the second bracket is fixedly connected to the lower surface of the inner wall of the positioning block.

[0012] As a further solution of the present invention: the lower surface of the support plate is fixedly connected to the upper surface of the workbench through the mounting plate, and the two workbenches are at the same horizontal position, the lower surfaces of the two workbenches are fixedly connected to the upper surface of the same sealing cover, the lower surface of the sealing cover is connected to the upper surface of the filter box through a conduit, and the lower surface of the filter box is connected to the air inlet of the fan.

[0013] As a further solution of the present invention: the driving device includes a driving motor, a driving shaft below the driving motor is fixedly connected to the upper surface of the driving wheel, the outer surface of the driving motor is fixedly connected to the inner wall of the driving fixing frame, and the lower surface of the driving fixing frame is respectively fixedly connected to the upper surfaces of the two positioning plates.

[0014] As a further solution of the present invention: the rotating device includes a first bearing, the outer surface of the first bearing is fixedly connected to the upper surface of the inner wall of the positioning block, a rotating shaft is sleeved inside the first bearing, the outer surfaces of the rotating shaft are respectively engaged with the inner walls of the two clamping blocks, and the top and bottom ends of the rotating shaft are respectively fixedly connected to the first connecting rod and one end of the opposite surface of the worm gear.

[0015] A welding method for an H-beam high-efficiency welding device comprises the following steps:

[0016] S1. When using the welding device, place the H-shaped steel to be welded on two workbenches respectively, and start the drive motor after preliminarily adjusting the positions of the two sections of H-shaped steel.

[0017] S2. When the driving motor is running, the two screw nuts will rotate rapidly driven by the driven wheel. As the two screw nuts are rotating, the two first screws will move downward along the screw nuts. As the telescopic rod limits the position of the positioning block, it is ensured that the positioning block will not rotate synchronously with the rotation of the screw nut. The first screw is connected to the rotating shaft through the first connecting rod. At the same time, two clamping blocks are clamped on the surface of the rotating shaft to limit the rotation of the first connecting rod and the first screw. When the driving motor is running, the two first screws will synchronously push the two positioning blocks downward due to the opposite thread directions, thereby preliminarily fixing the H-shaped steel.

[0018] S3. With the operation of the driving motor, the lower surfaces of the two positioning plates are in close contact with the surface of the H-shaped steel. When the pressure generated by the driving motor is greater than the friction between the two clamping blocks and the rotating shaft, the rotating shaft will rotate synchronously with the rotation of the first screw and the first connecting rod. When the rotating shaft rotates, the worm will synchronously drive the two turbines to rotate, so that the two turbines drive the second screw to rotate during the rotation process. Since the threaded barrels on the surfaces of the two second screws are in a horizontally fixed state when they rotate, the two clamping plates move in opposite directions, thereby fixing the positioning blocks to the inner wall of the H-shaped steel and supporting them by squeezing the inner wall of the H-shaped steel.

[0019] S4. After the H-beam is positioned by the welding device, the fan is started and the H-beam is welded. When the fan is running, the external gas will enter the sealing cover through the through holes on the upper surface of the workbench and the gap between the two workbenches, so that the air flow rate on the surface of the H-beam above the workbench increases rapidly.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention provides a driving device, a clamping block, a reinforcing rod, a worm, a positioning block and a clamping plate. When the pressure generated by the driving motor during operation is greater than the friction between the two clamping blocks and the rotating shaft, the rotating shaft will rotate synchronously with the rotation of the first screw and the first connecting rod. When the rotating shaft rotates, the worm will synchronously drive the two turbines to rotate, so that the two turbines drive the second screw to rotate during the rotation. Since the threaded barrels on the surfaces of the two second screws are in a horizontally fixed state when the two second screws rotate, the two clamping plates move in the opposite direction, thereby fixing the positioning block on the inner wall of the H-shaped steel, and by squeezing and supporting the inner wall of the H-shaped steel, the two H-shaped steels are both in a horizontal position at the center of the welding device. When welding the H-shaped steel, it is only necessary to start the driving motor, and the welding device can fix the H-shaped steel and adjust its horizontal position at the same time, which greatly reduces the difficulty of welding the H-shaped steel by the welding device, avoids the situation that the welding is affected by the misalignment of the two sections of the H-shaped steel, and ensures the welding quality and welding efficiency of the H-shaped steel by the welding device.

[0022] 2. The present invention provides a fan, a filter box and a sealing cover. After the H-shaped steel is positioned by the welding device, the fan is started and the H-shaped steel is welded. When the fan is running, external gas will enter the sealing cover through the through holes on the upper surface of the workbench and the gap between the two workbenches, so that the air flow rate on the surface of the H-shaped steel above the workbench is rapidly increased, thereby reducing the surface temperature of the H-shaped steel during welding and accelerating the heat dissipation of the H-shaped steel. At the same time, the waste slag and waste gas during welding will directly enter the filter box along the sealing cover and be discharged after being filtered, thereby improving the environmental protection effect of the welding device, avoiding damage to the surrounding environment and ensuring the safety of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the fixing frame of the present invention;

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the workbench of the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional cross-sectional structure of the positioning block of the present invention;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the turbine of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure enlarged at A of the present invention;

[0029] In the figure: 1 support frame, 2 retaining frame, 3 fixing frame, 4 support plate, 5 positioning bearing, 6 driven wheel, 7 screw nut, 8 transmission belt, 9 driving wheel, 10 driving device, 101 driving motor, 102 driving fixing frame, 11 positioning plate, 12 first screw, 13 first connecting rod, 14 rotating device, 141 rotating shaft, 142 first bearing, 15 clamping block, 16 reinforcement rod, 17 fixing rod, 18 positioning block, 19 worm, 20 turbine, 21 second screw, 22 threaded cylinder, 23 fixing sleeve, 24 connecting plate, 25 clamping plate, 26 second bearing, 27 first bracket, 28 second bearing, 29 third bearing, 30 second bracket, 31 workbench, 32 sealing cover, 33 filter box, 34 fan. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0031] like Figure 1-6 As shown, the present invention provides an H-beam efficient welding device, including a support frame 1, the number of the support frames 1 is four, the opposite surfaces of the two support frames 1 on the left and the two support frames 1 on the right are fixedly connected with retaining frames 2, and the opposite surfaces of the two retaining frames 2 are fixedly connected with two fixing frames 3, the upper surfaces of the two fixing frames 3 are fixedly connected with the lower surfaces of two support plates 4, the upper surfaces of the two support plates 4 are clamped with positioning bearings 5, the upper surfaces of the positioning bearings 5 ​​are clamped with driven wheels 6, and the inner walls of the two driven wheels 6 are respectively fixedly connected with the outer surfaces of two screw nuts 7, the outer surfaces of the two driven wheels 6 are wrapped with the same transmission belt 8, the two driven wheels 6 are transmission-connected to the driving wheel 9 through the transmission belt 8, and the upper surface of the driving wheel 9 is connected to the driving device 10 below. The shaft is fixedly connected, the lower surface of the driving device 10 is fixedly connected to the upper surfaces of the two positioning plates 11, and the left and right side surfaces of the two positioning plates 11 are fixedly connected to the opposite surfaces of the two support plates 4, and the first screw rod 12 is connected to the inner thread of the screw nut 7, and the bottom end of the first screw rod 12 passes through the screw nut 7 and is fixedly connected to the top of the first connecting rod 13, and the bottom end of the first connecting rod 13 is fixedly connected to the top of the rotating device 14, and the outer surface of the rotating device 14 is clamped with two clamping blocks 15, and the outer surfaces of the two clamping blocks 15 are fixedly connected with reinforcement rods 16, and the lower surfaces of the two reinforcement rods 16 are fixedly connected to the tops of the two fixing rods 17, and the bottom end of the fixing rod 17 is fixedly connected to the upper surface of the positioning block 18, and the thread directions of the two first screw rods 12 are opposite.

[0032] The bottom end of the rotating device 14 is fixedly connected to the top end of the worm 19, and the outer surface of the worm 19 is threadedly connected to two turbines 20, and the sides of the two turbines 20 that are away from each other are respectively fixedly connected to one end of the opposite sides of two second screw rods 21, and the outer surfaces of the two second screw rods 21 are threadedly connected to threaded tubes 22.

[0033] A fixing sleeve 23 is fixedly connected to the outer surface of the threaded barrel 22, and two connecting plates 24 are fixedly connected to the outer surface of the fixing sleeve 23. The fixing sleeve 23 is fixedly connected to the front surface of the clamping plate 25 through the two connecting plates 24. The front surface of the clamping plate 25 and the back surface of the positioning block 18 are mutually clamped, and the upper surfaces of the two positioning blocks 18 are fixedly connected to the lower surface of the support plate 4 through the telescopic rod.

[0034] A second bearing 26 is sleeved on the outer surface of the second screw rod 21 . The second bearing 26 is clamped on the front surface of the first bracket 27 . The lower surface of the first bracket 27 is fixedly connected to the lower surface of the inner wall of the positioning block 18 .

[0035] The front of the turbine 20 is fixedly connected to one end of the back of the second bearing 26. The outer surface of the second bearing 26 is sleeved with a third bearing 29. The third bearing 29 is clamped on the back of the second bracket 30. The lower surface of the second bracket 30 is fixedly connected to the lower surface of the inner wall of the positioning block 18.

[0036] The lower surface of the support plate 4 is fixedly connected to the upper surface of the workbench 31 through the mounting plate, and the two workbenches 31 are at the same horizontal position. The lower surfaces of the two workbenches 31 are fixedly connected to the upper surface of the same sealing cover 32. The lower surface of the sealing cover 32 is connected to the upper surface of the filter box 33 through a conduit, and the lower surface of the filter box 33 is connected to the air inlet of the fan 34.

[0037] The driving device 10 includes a driving motor 101, a driving shaft below the driving motor 101 is fixedly connected to the upper surface of the driving wheel 9, an outer surface of the driving motor 101 is fixedly connected to the inner wall of the driving fixing frame 102, and a lower surface of the driving fixing frame 102 is fixedly connected to the upper surfaces of the two positioning plates 11 respectively.

[0038] The rotating device 14 includes a first bearing 142, the outer surface of which is fixedly connected to the upper surface of the inner wall of the positioning block 18, and a rotating shaft 141 is sleeved inside the first bearing 142. The outer surfaces of the rotating shaft 141 are respectively engaged with the inner walls of the two clamping blocks 15, and the top and bottom ends of the rotating shaft 141 are respectively fixedly connected to one end of the first connecting rod 13 and the opposite side of the worm 19.

[0039] A welding method for an H-beam high-efficiency welding device comprises the following steps:

[0040] S1. When using the welding device, the H-shaped steels to be welded are placed on two workbenches 31 respectively, and the positions of the two H-shaped steels are preliminarily adjusted before starting the driving motor 101.

[0041] S2. When the driving motor 101 is running, the two screw nuts 7 will rotate rapidly driven by the driven wheel 6. As the two screw nuts 7 are rotating, the two first screws 12 will move downward along the screw nuts 7. Since the telescopic rod limits the position of the positioning block 18, it is ensured that the positioning block 18 will not rotate synchronously with the rotation of the screw nut 7. The first screw 12 is connected to the rotating shaft 141 through the first connecting rod 13. At the same time, two clamping blocks 15 are clamped on the surface of the rotating shaft 141, which limit the rotation of the first connecting rod 13 and the first screw 12. When the driving motor 101 is running, the two first screws 12 will synchronously push the two positioning blocks 18 to move downward due to the opposite thread directions, thereby preliminarily fixing the H-shaped steel.

[0042] S3. As the driving motor 101 runs, the lower surfaces of the two positioning plates 11 are in close contact with the surface of the H-shaped steel. When the pressure generated by the driving motor 101 is greater than the friction between the two clamping blocks 15 and the rotating shaft 141, the rotating shaft 141 will rotate synchronously with the rotation of the first screw rod 12 and the first connecting rod 13. When the rotating shaft 141 rotates, the worm 19 will synchronously drive the two turbines 20 to rotate, so that the two turbines 20 drive the second screw rod 21 to rotate during the rotation. Since the threaded tubes 22 on the surfaces of the two second screw rods 21 are in a horizontally fixed state when they rotate, the two clamping plates 25 move in the opposite direction, thereby fixing the positioning blocks 18 to the inner wall of the H-shaped steel and supporting it by squeezing the inner wall of the H-shaped steel.

[0043] S4. After the H-beam is positioned by the welding device, the fan 34 is started and the H-beam is welded. When the fan 34 is running, the external gas will enter the sealing cover 32 through the through holes on the upper surface of the workbench 31 and the gap between the two workbenches 31, so that the air flow rate on the surface of the H-beam above the workbench 31 is rapidly increased.

[0044] By arranging the driving device 10, the reinforcing rod 16, the worm 19, the positioning block 18 and the clamping plate 25, the two H-shaped steels are both in a horizontal position at the center of the welding device, so that when welding the H-shaped steel, it is only necessary to start the driving motor 101, and the welding device can fix the H-shaped steel and adjust its horizontal position at the same time, which greatly reduces the difficulty of welding the H-shaped steel by the welding device, avoids the situation where the welding is affected by the misalignment of the two sections of the H-shaped steel, and ensures the welding quality and welding efficiency of the H-shaped steel by the welding device.

[0045] By providing the fan 34, the filter box 33 and the sealing cover 32, the surface temperature of the H-beam is reduced during welding, and the heat dissipation of the H-beam is accelerated. At the same time, the waste slag and waste gas during welding will directly enter the filter box 33 along the sealing cover 32 and be discharged after being filtered, thereby improving the environmental protection effect of the welding device, avoiding damage to the surrounding environment and ensuring the safety of personnel.

[0046] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0047] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0048] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An H-beam high-efficiency welding device, comprising a support frame (1), characterized in that: The number of the support frames (1) is four, and the opposing surfaces of the two support frames (1) on the left and the two support frames (1) on the right are fixedly connected to the retaining frames (2), and the opposing surfaces of the two retaining frames (2) are fixedly connected to the two fixing frames (3), the upper surfaces of the two fixing frames (3) are fixedly connected to the lower surfaces of the two support plates (4), the upper surfaces of the two support plates (4) are clamped with positioning bearings (5), the upper surfaces of the positioning bearings (5) are clamped with driven wheels (6), and the inner walls of the two driven wheels (6) are respectively fixedly connected to the outer surfaces of the two screw nuts (7), the outer surfaces of the two driven wheels (6) are wrapped with the same transmission belt (8), the two driven wheels (6) are transmission-connected to the driving wheel (9) through the transmission belt (8), the upper surface of the driving wheel (9) is fixedly connected to the driving shaft below the driving device (10), and the driving device (10) The lower surface of the two positioning plates (11) is respectively fixedly connected to the upper surfaces of the two positioning plates (11), and the left and right side surfaces of the two positioning plates (11) are respectively fixedly connected to the opposite surfaces of the two support plates (4); the screw nut (7) is internally threadedly connected to a first screw rod (12); the bottom end of the first screw rod (12) passes through the screw nut (7) and is fixedly connected to the top end of a first connecting rod (13); the bottom end of the first connecting rod (13) is fixedly connected to the top end of a rotating device (14); the outer surface of the rotating device (14) is clamped with two clamping blocks (15); the outer surfaces of the two clamping blocks (15) are fixedly connected to reinforcing rods (16); the lower surfaces of the two reinforcing rods (16) are respectively fixedly connected to the top ends of two fixing rods (17); the bottom end of the fixing rod (17) is fixedly connected to the upper surface of the positioning block (18); and the thread directions of the two first screw rods (12) are opposite; The bottom end of the rotating device (14) is fixedly connected to the top end of the worm (19); the outer surface of the worm (19) is threadedly connected to two turbines (20); and the two turbines (20) are respectively fixedly connected to one end of the opposite surface of two second screw rods (21); and the outer surfaces of the two second screw rods (21) are both threadedly connected to threaded barrels (22); The outer surface of the threaded cylinder (22) is fixedly connected to a fixing sleeve (23), the outer surface of the fixing sleeve (23) is fixedly connected to two connecting plates (24), the fixing sleeve (23) is fixedly connected to the front surface of a clamping plate (25) via the two connecting plates (24), the front surface of the clamping plate (25) and the back surface of the positioning block (18) are mutually clamped, and the upper surfaces of the two positioning blocks (18) are fixedly connected to the lower surface of the support plate (4) via telescopic rods; The outer surface of the second screw rod (21) is sleeved with a second bearing (26), the second bearing (26) is clamped on the front surface of the first bracket (27), and the lower surface of the first bracket (27) is fixedly connected to the lower surface of the inner wall of the positioning block (18); The front surface of the turbine (20) is fixedly connected to one end of the back surface of the second bearing (26); the outer surface of the second bearing (26) is sleeved with a third bearing (29); the third bearing (29) is clamped on the back surface of the second bracket (30); and the lower surface of the second bracket (30) is fixedly connected to the lower surface of the inner wall of the positioning block (18); The lower surface of the support plate (4) is fixedly connected to the upper surface of the workbench (31) via a mounting plate, and the two workbenches (31) are at the same horizontal position. The lower surfaces of the two workbenches (31) are fixedly connected to the upper surface of the same sealing cover (32). The lower surface of the sealing cover (32) is connected to the upper surface of the filter box (33) via a conduit, and the lower surface of the filter box (33) is connected to the air inlet of the fan (34); The driving device (10) comprises a driving motor (101), a driving shaft below the driving motor (101) being fixedly connected to the upper surface of the driving wheel (9), an outer surface of the driving motor (101) being fixedly connected to the inner wall of a driving fixing frame (102), and a lower surface of the driving fixing frame (102) being fixedly connected to the upper surfaces of two positioning plates (11) respectively; The rotating device (14) comprises a first bearing (142), the outer surface of the first bearing (142) being fixedly connected to the upper surface of the inner wall of the positioning block (18), a rotating shaft (141) being sleeved inside the first bearing (142), the outer surface of the rotating shaft (141) being respectively engaged with the inner walls of the two clamping blocks (15), and the top and bottom ends of the rotating shaft (141) being respectively fixedly connected to the first connecting rod (13) and one end of the worm (19) opposite to the surface.

2. The welding method of the H-beam high-efficiency welding device according to claim 1 is characterized in that: The following steps are involved: S1. When using the welding device, the H-shaped steels to be welded are placed on two workbenches (31) respectively, and the positions of the two H-shaped steels are preliminarily adjusted before starting the driving motor (101); S2. When the driving motor (101) is running, the two screw nuts (7) will rotate rapidly under the drive of the driven wheel (6). As the two screw nuts (7) are rotating, the two first screws (12) will move downward along the screw nuts (7). Since the telescopic rod limits the position of the positioning block (18), it is ensured that the positioning block (18) will not rotate synchronously with the rotation of the screw nut (7). The first screw (12) is connected to the rotating shaft (141) through the first connecting rod (13). At the same time, two clamping blocks (15) are clamped on the surface of the rotating shaft (141), which limit the rotation of the first connecting rod (13) and the first screw (12). When the driving motor (101) is running, the two first screws (12) will synchronously push the two positioning blocks (18) downward due to the opposite thread directions, thereby preliminarily fixing the H-shaped steel. S3. As the driving motor (101) operates, the lower surfaces of the two positioning plates (11) are in close contact with the surface of the H-shaped steel. When the pressure generated by the driving motor (101) is greater than the friction between the two clamping blocks (15) and the rotating shaft (141), the rotating shaft (141) rotates synchronously with the rotation of the first screw rod (12) and the first connecting rod (13). When the rotating shaft (141) rotates, the worm (19) synchronously drives the two turbines (20) to rotate, so that the two turbines (20) drive the second screw rod (21) to rotate during the rotation process. Since the threaded barrels (22) on the surfaces of the two second screw rods (21) are in a horizontally fixed state when they rotate, the two clamping plates (25) move in the opposite direction, thereby fixing the positioning blocks (18) to the inner wall of the H-shaped steel and supporting the inner wall of the H-shaped steel by squeezing. S4. After the H-shaped steel is positioned by the welding device, the fan (34) is started and the H-shaped steel is welded. When the fan (34) is running, external gas enters the sealing cover (32) through the through holes on the upper surface of the workbench (31) and the gap between the two workbenches (31), so that the air flow rate on the surface of the H-shaped steel above the workbench (31) is rapidly increased.

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