A positioning device for bridge steel plate welding and a method thereof

Abstract

The application relates to the technical field of bridge steel plate welding positioning, and discloses a bridge steel plate welding positioning device, which comprises a base, the base is in the shape of a U-shaped groove, the back of the base is hollow, and the device and a method thereof are characterized in that a preheating box for preheating the steel plate is arranged on the two sides of the base, the whole steel plate is heated to a certain degree before welding, the whole steel plate is in a stress-transferring state, the heat generated at the welding position can be more quickly conducted in the steel plate during the welding process, the positioning and clamping structure for clamping the steel plate is combined, the deformation of the steel plate due to internal stress is directionally rolled away from the welding position by directional rolling of the pressure roller, the positioning stability of the steel plate is ensured, the internal tensile stress of the steel plate after welding is as little as possible, and the steel plate after welding is free of tensile stress or deformation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge steel plate welding positioning, in particular to a bridge steel plate welding positioning device and method. BACKGROUND

[0002] Bridge steel plate is a thick steel plate specially used for manufacturing bridge structural parts, which is made of special steel grade carbon steel and low alloy steel for bridge construction, and has very high strength, toughness and impact resistance. The existing bridge steel plate needs to be accurately positioned and welded according to the actual situation before use, and then transported to the bridge for installation after welding. The existing welding equipment for bridge steel plate still has some problems, as follows:

[0003] When the existing steel plate welding device needs to be welded at a certain angle, the welding angle is usually measured manually, and the device is used to position and support the steel plate at the angle, so that the edges of the two steel plates are butt jointed and welded. The welding process is accompanied by high temperature, which will cause uneven heating of the welded part during welding, and then thermal expansion of the welded part, so that the whole welded part deforms. After the welding is completed, there is still tensile stress inside the welded part, which will further increase the deformation degree of the welded part, and then cause the welded part to crack at the welding position and the installation component to collapse due to the deformation of the welded part itself. The existing welding device cannot fix the welded part well, and cannot release the tensile stress generated in the welding process, so the tensile stress always exists inside the welded part, which cannot guarantee the service life of the welded part.

[0004] Therefore, we propose a bridge steel plate welding positioning device and method. SUMMARY

[0005] In view of the shortcomings of the prior art, the present application provides a bridge steel plate welding positioning device and method, which has the advantages of releasing the stress inside the welded part and accurate fixing and positioning, and solves the problems raised in the background art.

[0006] The application provides the following technical scheme: a bridge steel plate welding positioning device, comprising a base, the base is in a U-shaped groove shape and the back of the base is hollow, a first air permeable grid is arranged on the back of the base and penetrates the hollow part of the back of the base, a scale disc is arranged on the back of the base, preheating boxes are fixedly installed at the lower ends of the two sides of the base, doors are movably installed at the bottom ends of the two sides of the base, push structures are arranged and installed at the middle parts of the two sides of the base, lifting drive structures are movably installed at the upper sides of the two sides of the base, two symmetrical positioning clamping structures are movably installed in the groove of the base, and feeding slots are arranged at the two ends of the two positioning clamping structures in the groove of the base.

[0007] The push structure comprises a support, an electric push rod is fixedly installed at the bottom end of the support, and a push block is fixedly installed at the telescopic end of the electric push rod.

[0008] The lifting drive structure comprises a first drive motor and two drive wheels, a first gear is fixedly installed at the output shaft of the first drive motor, a second gear is fixedly installed at the top end of one of the drive wheels, a belt is movably sleeved and installed between the two drive wheels, a lifting screw is fixedly installed at the bottom end of one of the drive wheels and penetrates the base, and a bearing plate is movably connected to the bottom end of the lifting screw.

[0009] The positioning clamping structure comprises an outer frame, an air bellow is fixedly installed at one end of the first air permeable grid in the inner part of the outer frame, a support buckle is movably installed on one side of the outer frame, which is close to the middle part of the base and away from the air bellow, support bases are fixedly installed at the two ends of the outer frame, an inner motor is arranged in the support base, a rotating rod is fixedly installed at the output shaft of the inner motor, a support plate is fixedly installed between the two support bases, a feeding drive structure is fixedly installed on one side of the support plate, a conveying belt is movably sleeved on the rotating rod, pressure rollers are movably installed on the outer surface of the conveying belt, and clamping grooves are evenly arranged at the two ends of the conveying belt.

[0010] In a preferred embodiment, a fan is arranged at the back of the groove in the inner part of the base, and a transverse long groove is arranged on the opposite surface of the first air permeable grid and the air bellow.

[0011] In a preferred embodiment, the support is in an L shape, and the telescopic length of the electric push rod is greater than or equal to the distance between the inner wall of the preheating box on one side of the center of the base and the nearest pressure roller.

[0012] In a preferred embodiment, the first drive motor is fixedly installed at the top end of the base, the drive wheel is movably installed at the top end of the base, the first gear is engaged with the second gear, the bottom end of the lifting screw is movably connected inside the bottom end of the preheating box, and the bearing plate is movably sleeved on the lifting screw.

[0013] In a preferred embodiment, the bellow is provided with air-permeable grooves on both sides, the outer frame is provided with a protrusion at the bottom end of the support buckle, the support buckle is provided with a slot hole that can be connected with the protrusion, the upper and lower surfaces of the support plate are arranged in close contact with the inner surface of the conveying belt, the two ends of the compression roller are movably installed on the outer surface of the conveying belt through the support heads, a one-letter-shaped slot is formed in the rotating shaft of the support head at one end of the compression roller, the compression roller is made of high-strength and ductile material, and the compression roller is arranged in spaced relation with the outer surface of the conveying belt.

[0014] In a preferred embodiment, the feeding drive structure comprises a base plate, a hanger is movably installed at the bottom end of the base plate, a butt push rod is fixedly installed at one side of the top end of the hanger, a second drive motor is fixedly installed on the hanger, a control structure is movably installed on the base plate, and a plug-in rod is fixedly installed on the output shaft of the second drive motor.

[0015] In a preferred embodiment, the base plate is fixedly installed on the side of the support plate close to the preheating box, the butt push rod is installed on the side of the control structure, the end of the butt push rod is connected with a driven push block having a slope structure, the bottom end of the control structure is in sliding connection with the butt push rod, and the end of the plug-in rod is provided with a one-letter-shaped plug-in plate that is adapted for use in the one-letter-shaped slot of the compression roller.

[0016] In a preferred embodiment, the control structure comprises an adjusting screw, a rotating end is fixedly installed at the top end of the adjusting screw, a connecting rod is movably installed at the bottom end of the adjusting screw, a push block is fixedly installed at the bottom end of the connecting rod, and limit wing plates are fixedly installed on both sides of the connecting rod.

[0017] In a preferred embodiment, a corresponding limit sliding groove is formed in the base plate at the position of the limit wing plate, the connecting rod is slidably arranged in the limit sliding groove, the adjusting screw is threadedly connected at the position of the limit sliding groove in the base plate, and the lower end of the side adjacent to the butt push rod of the push block is provided with a slope structure that is adapted thereto.

[0018] A method for a bridge steel plate welding positioning device, comprising five steps of preheating of the steel plate, feeding of the steel plate, positioning and adjusting of the steel plate, welding of the steel plate, and taking out of the finished product, specifically as follows:

[0019] S1, preheating of the steel plate: open the door, place the steel plate in the preheating box, then close the door, and preheat the steel plate with the preheating box;

[0020] S2, feeding of the steel plate: start the first drive motor, which drives the drive wheel to rotate through the first gear and the second gear, and drives the lifting screw connected thereto to rotate, while driving the other drive wheel and the lifting screw thereon to rotate through the belt, so that the first drive motor carries the steel plate upward, then start the electric push rod, which drives the push block to push the steel plate into the outer frame, and also rotates the rotating end to make the adjusting screw descend and drive the push block to move, so that the insertion rod is inserted into the linear slot of the compression roller to drive the compression roller to rotate and assist the feeding of the steel plate into the outer frame;

[0021] S3, positioning and adjusting of the steel plate: after the steel plate enters the outer frame, the support buckle is buckled and fixed, and the positioning clamping structure on one side is rotated according to the requirement to form the required angle of the steel plate between the two positioning clamping structures, and the angle of rotation is determined according to the dial;

[0022] S4, welding of the steel plate: manually weld the butt joint end of the two steel plates after angle adjustment;

[0023] S5, taking out of the finished product: take out the welded product.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The device and method for positioning and welding of bridge steel plates, by providing preheating boxes on both sides of the base to preheat the steel plates, the steel plates are heated to a certain extent before welding, so that the whole is in a state of stress transfer, which ensures that the heat generated during welding can be more quickly conducted in the steel plate, and the deformation of the steel plate due to internal stress is directed away from the welding area by the directional roller pressing of the compression roller, which ensures the stability of the positioning of the steel plate and the internal tensile stress of the steel plate after welding as little as possible to ensure that the steel plate will not have tensile stress or deformation after welding.

[0026] 2. The device and method for positioning and welding of bridge steel plates, by providing positioning clamping structures through the preheating boxes on both sides, the steel plates preheated in the preheating boxes can be directly sent to the positioning clamping structures, and the two positioning clamping structures can be rotated, and a dial is provided on the base to directly observe and determine the angle of rotation, ensuring the accuracy of welding. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1It is a schematic diagram of the stereoscopic structure of the present application;

[0028] Figure 2 It is a schematic diagram of the front view structure of the present application;

[0029] Figure 3 It is a first schematic diagram of the positioning and clamping structure of the present application;

[0030] Figure 4 It is a second schematic diagram of the positioning and clamping structure of the present application;

[0031] Figure 5 It is a schematic diagram of the feeding driving structure of the present application; Figure 3

[0032] Figure 6 It is a schematic diagram of the feeding driving structure of the present application;

[0033] Figure 7 It is a schematic diagram of the control structure of the present application.

[0034] In the figure: 1, base; 2, first air-permeable grid; 3, dial; 4, preheating box; 5, blocking door; 6, pushing structure; 61, support; 62, electric push rod; 63, pushing block; 7, lifting driving structure; 71, first driving motor; 72, driving wheel; 73, first gear; 74, second gear; 75, belt; 76, lifting screw; 77, bearing plate; 8, positioning and clamping structure; 81, outer frame; 82, bellows; 83, support buckle; 84, support base; 85, rotating rod; 86, support plate; 87, feeding driving structure; 871, base plate; 872, hanger; 873, abutting push rod; 874, second driving motor; 875, control structure; 8751, adjusting screw; 8752, rotating end; 8753, connecting rod; 8754, pushing block; 8755, limiting wing plate; 876, plug-in rod; 88, guide belt; 89, compression roller; 810, clamping groove; 9, feeding slot. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] Please refer to Figure 1 and Figure 2 ​The utility model provides a kind of bridge steel plate welding positioning device, including base 1, base 1 is U-shaped recess and back interior is hollow, base 1 is located recess interior back and is provided with first air grating 2 with the hollow portion of the back interior of base 1 penetrates and sets, scale dial 3 is arranged on the back of the recess of base 1, preheating box 4 is fixedly installed in the both sides lower end of the inside of base 1, the bottom end of the both sides of base 1 is movably installed with door 5 at the place where preheating box 4 is located, push structure 6 is installed respectively at the middle part of the both sides of base 1, lifting drive structure 7 is movably installed respectively on the both sides of base 1, two symmetrical positioning clamping structures 8 are movably installed in the recess of base 1, feeding slot 9 is respectively set in the both ends of the two positioning clamping structures 8 in the recess of base 1;

[0037] Compared with the prior art, the preheating box 4 for preheating the steel plate is arranged on the both sides of the base 1, so that the steel plate is heated to a certain extent before welding, so that the whole is in a stress-transmitting state, which ensures that the heat generated at the welding position can be more quickly conducted in the steel plate during welding. Combined with the positioning clamping structure 8 for clamping the steel plate, the deformation of the steel plate due to internal stress is directed away from the welding position by the directional roller pressing of the pressure roller 89, which ensures the positioning stability of the steel plate and minimizes the internal tensile stress of the steel plate after welding to ensure that the steel plate does not have tensile stress or deformation after welding. The positioning clamping structure 8 through the preheating box 4 on both sides can directly send the preheated steel plate in the preheating box 4 to the positioning clamping structure 8, and the two positioning clamping structures 8 can rotate, and the scale dial 3 is arranged on the base 1, so that the angle of rotation can be directly observed and determined, ensuring the accuracy of welding.

[0038] Please refer to Figure 1 A bridge steel plate welding positioning device includes a base 1, a fan is arranged in the inside of base 1 at the back of the recess, and the opposite surfaces of the first air grating 2 and the air box 82 are provided with through horizontal long grooves.

[0039] In this embodiment, it should be noted that the cooling airflow generated by the fan inside the base 1 can be blown out through the first air grille 2, then enter the wind box 82 through the long slot on the wind box 82, and finally cool the welding part during the welding process, ensuring that the entire welding part also returns to a high-strength state after the tensile stress release is completed during the welding process. And because the positioning and clamping structure 8 is rotatable, the long slot on the wind box 82 is always partially connected with the first air grille 2, so that during rotation, the airflow in the first air grille 2 can always enter the wind box 82 through the long slot on the wind box 82, thereby ensuring that the welding part can be continuously and effectively cooled during the welding process, thereby avoiding the welding part being in a high-temperature shapeable state after welding is completed.

[0040] Please refer to Figure 1 and Figure 2 A bridge steel plate welding positioning device comprises a pushing structure 6, the pushing structure 6 comprises a bracket 61, the bottom end of the bracket 61 is fixedly installed with an electric push rod 62, and the telescopic end of the electric push rod 62 is fixedly installed with a pushing block 63.

[0041] In this embodiment, it should be noted that the bracket 61 is L-shaped, and the telescopic length of the electric push rod 62 is greater than or equal to the distance between the inner wall of the preheating box 4 located on one side of the center of the base 1 and the nearest adjacent compression roller 89. In this way, when it is necessary to push the preheated steel plate in the preheating box 4 into the positioning and clamping structure 8, the telescopic range of the electric push rod 62 can be used to push one end of the steel plate to the compression roller 89, and then the second drive motor 874 is used to drive the compression roller 89 in contact with the steel plate to rotate. Combined with the pushing action of the electric push rod 62, the steel plate can be well pushed into the outer frame body 81 for placement and fixation, ensuring the use effect of the device.

[0042] Please refer to Figure 1 and Figure 2 A bridge steel plate welding positioning device comprises a lifting drive structure 7, the lifting drive structure 7 comprises a first drive motor 71 and two drive wheels 72, the output shaft of the first drive motor 71 is fixedly installed with a first gear 73, the top end of one drive wheel 72 is fixedly installed with a second gear 74, the belt 75 is movably sleeved and connected between the two drive wheels 72, the bottom end of one drive wheel 72 penetrates through the base 1 and is fixedly installed with a lifting screw 76, and the bottom end of the lifting screw 76 is movably connected with a bearing plate 77.

[0043] In this embodiment, it needs to be explained that the first drive motor 71 is fixedly installed at the top end of the base 1, the drive wheel 72 is movably installed at the top end of the base 1, the first gear 73 is engaged with the second gear 74, the bottom end of the lifting screw 76 is movably connected inside the bottom end of the preheating box 4, and the bearing plate 77 is movably sleeved on the lifting screw 76. In this way, the bearing plate 77 can be used to carry the steel plate that needs to be welded, and the steel plate is preheated in the preheating box 4. After preheating, when welding is needed, the first drive motor 71 is used to drive the first gear 73 to rotate, so as to drive the lifting screw 76 to rotate through the engagement of the second gear 74. In this way, the bearing plate 77 will move upward under the rotating action of the lifting screw 76. In this way, the steel plate is sent to the top end of the preheating box 4, and then the pushing structure 6 is used to send the steel plate to the positioning and clamping structure 8 for fixation and subsequent welding operation. The whole device does not need too much manual operation, and can also ensure the subsequent welding effect of the steel plate.

[0044] Please refer to Figures 1-4 A bridge steel plate welding positioning device, comprising a positioning and clamping structure 8, the positioning and clamping structure 8 comprises an outer frame 81, a wind box 82 is fixedly installed at one end of the first air permeable grid 2 inside the outer frame 81, a support buckle 83 is movably installed on one side of the outer frame 81 close to the middle of the base 1 away from the wind box 82, support bases 84 are fixedly installed on both ends of the outer frame 81, an inner motor is arranged in the support base 84, a rotating rod 85 is fixedly installed on the output shaft of the inner motor, a support plate 86 is fixedly installed between the two support bases 84, a feeding drive structure 87 is fixedly installed on one side of the support plate 86, a conveying belt 88 is movably sleeved on the rotating rod 85, pressure rollers 89 are movably installed on the outer surface of the conveying belt 88, and clamping grooves 810 are evenly formed at both ends of the conveying belt 88.

[0045] In this embodiment, it should be noted that the air bellow 82 is provided with air permeable grooves on both sides, the outer frame 81 is provided with a protrusion at the bottom end where the support buckle 83 is installed, the bottom end of the support buckle 83 is provided with a slot hole that can be connected with the protrusion, the upper and lower surfaces of the support plate 86 are arranged in close contact with the inner surface of the conveying belt 88, the two ends of the compression roller 89 are movably installed on the outer surface of the conveying belt 88 through support heads, a one-letter-shaped slot is formed in the rotating shaft of the support head at the end of the compression roller 89 where the feeding driving structure 87 is located, the compression roller 89 is made of high-strength and ductile material, and the compression roller 89 is arranged in close contact with the outer surface of the conveying belt 88. In this way, after the steel plate is pushed into the outer frame 81 from the preheating box 4, the protrusion at the bottom end of the support buckle 83 can be buckled into the slot hole, so that the outer frame 81 with the compression roller 89 is tightly pressed against the surface of the steel plate, thereby realizing normal feeding when the outer frame 81 needs to be fed. During the welding process, the inner motor drives the rotating rod 85 to rotate, thereby driving the conveying belt 88 and the compression roller 89 on it to rotate, and the steel plate surface pressed by the compression roller 89 is rolled. Since the steel plate is preheated, the tensile stress generated at the welding site will be conducted from the welding site to the other end of the steel plate under the action of rolling and released by dispersing the tensile stress, so as to ensure that the steel plate does not have a large amount of tensile stress inside after welding. Combined with the continuous air cooling effect of the airflow generated in the base 1 on the steel plate during the welding process, the steel plate slowly recovers to a high-strength state while eliminating and releasing the tensile stress. After welding, the support buckle 83 is opened to release the pressure on the steel plate, and the finished product is taken out.

[0046] Please refer to Figure 3 and Figure 5 A bridge steel plate welding positioning device, comprising a feeding driving structure 87, the feeding driving structure 87 comprises a base plate 871, the bottom end of the base plate 871 is movably installed with a hanger 872, one side of the top end of the hanger 872 is fixedly installed with a butt push rod 873, the hanger 872 is sleeved and fixedly installed with a second driving motor 874, the base plate 871 is movably installed with a control structure 875, and the output shaft of the second driving motor 874 is fixedly installed with a plug-in rod 876.

[0047] In the embodiment, it should be noted that the substrate 871 is fixedly installed on the side of the support plate 86 close to the preheating box 4, the butt push rod 873 is installed on the side of the control structure 875, and the end of the butt push rod 873 is connected with a driven push block with a slope structure. The bottom end of the control structure 875 is in sliding connection with the butt push rod 873, and the end of the plug-in rod 876 is provided with a one-word plugboard which is adapted for use with a one-word slot on the compression roller 89. Thus, when it is needed to send the steel plate into the outer frame 81, the one-word plugboard at the end of the plug-in rod 876 is inserted into the slot at one end of the compression roller 89 by pushing the butt push rod 873 to move horizontally at the bottom end of the substrate 871 by the control structure 875, so that the compression roller 89 is driven to rotate actively by the second driving motor 874, thereby assisting the steel plate to complete the feeding.

[0048] Please refer to Figure 6 and Figure 7 A steel plate welding positioning device for a bridge comprises a control structure 875, and the control structure 875 comprises an adjusting screw 8751, a rotating end 8752 is fixedly installed at the top end of the adjusting screw 8751, a connecting rod 8753 is movably installed at the bottom end of the adjusting screw 8751, a push block 8754 is fixedly installed at the bottom end of the connecting rod 8753, and limiting wing plates 8755 are fixedly installed at both sides of the connecting rod 8753.

[0049] In the embodiment, it should be noted that a corresponding limiting sliding groove is formed in the substrate 871 at the limiting wing plates 8755, the connecting rod 8753 is slidably arranged in the limiting sliding groove, the adjusting screw 8751 is threadedly connected at the limiting sliding groove in the interior of the substrate 871, and a slope structure is arranged at the lower end of the side adjacent to the butt push rod 873 of the push block 8754. Thus, when it is needed to assist the feeding by the feeding driving structure 87, the plug-in rod 876 is pushed downward to abut against the compression roller 89 by the push block 8754, so that the compression roller 89 is driven to rotate actively, thereby driving the steel plate to move and ensuring the effective feeding of the device.

[0050] A method for using a steel plate welding positioning device for a bridge comprises five steps of preheating the steel plate, feeding the steel plate, positioning and adjusting the steel plate, welding the steel plate, and taking out the finished product, which are as follows.

[0051] S1, preheating the steel plate: opening the door 5, placing the steel plate in the preheating box 4, and then closing the door 5 to preheat the steel plate by the preheating box 4.

[0052] S2, feeding of the steel plate: start the first driving motor 71, the first driving motor 71 drives the driving wheel 72 to rotate through the first gear 73 and the second gear 74, the driving wheel 72 drives the lifting screw 76 connected thereto to rotate, at the same time, another driving wheel 72 and the lifting screw 76 connected thereto are driven to rotate through the belt 75, so that the first driving motor 71 carries the steel plate to move upward, then start the electric push rod 62, the electric push rod 62 drives the push block 63 to push the steel plate into the outer frame body 81, at the same time, the rotating end 8752 is also rotated, so that the adjusting screw 8751 and the push block 8754 are driven to move downward, and the plug-in rod 876 is inserted into the letter-shaped slot of the compression roller 89, and the compression roller 89 is driven to rotate, assisting the feeding of the steel plate into the outer frame body 81;

[0053] S3, positioning and adjusting of the steel plate: after the steel plate enters the outer frame body 81, the support buckle 83 is buckled and fixed, at the same time, one side of the positioning and clamping structure 8 is rotated according to the requirement, so that the steel plate forms the required angle in the two positioning and clamping structures 8, and the angle of rotation is determined according to the scale disc 3;

[0054] S4, welding of the steel plate: the butt joint end of the two steel plates after the angle adjustment is welded manually;

[0055] S5, taking out of the finished product: the finished product after welding is taken out.

[0056] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the drawings of the present application, the filling pattern is only for distinguishing the layers, and does not have any other limitation.

[0057] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A positioning device for the welding of bridge steel plates comprising a base (1), characterized in that: The base (1) is a U-shaped groove and the inside of the back is hollow, the back of the base (1) is provided with a first air grille (2) penetrating the hollow part of the back of the base (1), the back of the groove of the base (1) is provided with a scale disc (3), the lower ends of the two sides of the inside of the base (1) are fixedly installed with preheating boxes (4), the bottom ends of the two sides of the base (1) are movably installed with stop doors (5) at the positions of the preheating boxes (4), the middle parts of the two sides of the base (1) are movably installed with pushing structures (6), the upper sides of the two sides of the base (1) are movably installed with lifting driving structures (7), the inside of the groove of the base (1) is movably installed with two symmetrically arranged positioning and clamping structures (8), the groove of the base (1) is provided with feeding slots (9) at the two ends of the two positioning and clamping structures (8); The pushing structure (6) comprises a support (61), and the bottom end of the support (61) is fixedly installed with an electric push rod (62), and the telescopic end of the electric push rod (62) is fixedly installed with a pushing block (63); The lifting driving structure (7) comprises a first driving motor (71) and two driving wheels (72), the output shaft of the first driving motor (71) is fixedly installed with a first gear (73), the top end of one of the driving wheels (72) is fixedly installed with a second gear (74), the two driving wheels (72) are movably sleeved with a belt (75), the bottom ends of the two driving wheels (72) are fixedly installed with a lifting screw rod (76) penetrating the base (1), and the bottom end of the lifting screw rod (76) is movably connected with a bearing plate (77); the first gear (73) is engaged with the second gear (74), the bottom end of the lifting screw rod (76) is movably connected inside the bottom end of the preheating box (4), and the bearing plate (77) is movably sleeved on the lifting screw rod (76); The positioning and clamping structure (8) comprises an outer frame (81), the inside of the outer frame (81) is fixedly installed with a bellows (82) at one end of the first air grille (2), a supporting buckle (83) is movably installed on one side of the outer frame (81) near the middle part of the base (1) away from the bellows (82), and support bases (84) are fixedly installed on both ends of the outer frame (81); an inner motor is arranged in the support base (84), a rotating rod (85) is fixedly installed on the output shaft of the inner motor, a supporting plate (86) is fixedly installed between the two support bases (84), a feeding driving structure (87) is fixedly installed on one side of the supporting plate (86), the rotating rod (85) is movably sleeved with a conveying belt (88), pressure rollers (89) are movably installed on the outer surface of the conveying belt (88), and clamping grooves (810) are uniformly formed in both ends of the conveying belt (88); The pressure roller (89) is provided with a one-shaped insertion slot on the rotating shaft in the supporting head at one end of the feeding driving structure (87). The feeding driving structure (87) comprises a base plate (871), a hanger (872) movably mounted at the bottom end of the base plate (871), a second driving motor (874) fixedly mounted on the hanger (872), and a plug-in rod (876) fixedly mounted on the output shaft of the second driving motor (874), wherein the end of the plug-in rod (876) is provided with a one-word plug-in plate which is adapted to be used with a one-word plug-in slot on the compression roller (89).

2. The positioning device for the bridge steel plate welding according to claim 1, characterized in that: The inside of the base (1) is provided with a fan at the back of the groove, and the opposite surfaces of the first air-permeable grid (2) and the air bellow (82) are both provided with through transverse long grooves.

3. The positioning device for the bridge steel plate welding according to claim 1, characterized in that: The bracket (61) is L-shaped, and the telescopic length of the electric push rod (62) is greater than or equal to the distance between the inner wall of the preheating box (4) on one side of the center of the base (1) and the nearest compression roller (89).

4. The positioning device for the bridge steel plate welding according to claim 1, characterized in that: The first driving motor (71) is fixedly mounted at the top end of the base (1), and the driving wheel (72) is movably mounted at the top end of the base (1).

5. The positioning device for the bridge steel plate welding according to claim 1, characterized in that: The air bellow (82) is provided with air-permeable grooves on both sides, the outer frame (81) is provided with a protrusion at the bottom end where the support buckle (83) is mounted, the bottom end of the support buckle (83) is provided with a slot hole which can be connected with the protrusion, the upper and lower surfaces of the support plate (86) are both provided with the inner surface of the conveying belt (88), the two ends of the compression roller (89) are movably mounted on the outer surface of the conveying belt (88) through the support head, and the compression roller (89) is arranged at intervals on the outer surface of the conveying belt (88).

6. The positioning device for the bridge steel plate welding according to claim 1, characterized in that: The top end of the hanger (872) is fixedly mounted with a butt push rod (873), and the base plate (871) is movably mounted with a control structure (875).

7. The positioning device for welding of bridge steel plates according to claim 6, characterized in that: The base plate (871) is fixedly mounted on the support plate (86) on the side close to the preheating box (4), the butt push rod (873) is mounted on the side where the control structure (875) is located, and the end of the butt push rod (873) is connected with a driven push block with an inclined surface structure, and the bottom end of the control structure (875) is slidingly connected with the butt push rod (873).

8. The positioning device for the bridge steel plate welding according to claim 6, characterized in that: The control structure (875) comprises an adjusting screw (8751), a rotating end (8752) fixedly mounted at the top end of the adjusting screw (8751), a connecting rod (8753) movably mounted at the bottom end of the adjusting screw (8751), a push block (8754) fixedly mounted at the bottom end of the connecting rod (8753), and a limiting wing plate (8755) fixedly mounted at both sides of the connecting rod (8753).

9. The positioning device for welding of bridge steel plates according to claim 8, characterized in that: The inside of the base plate (871) is provided with a corresponding limiting sliding groove at the limiting wing plate (8755), the connecting rod (8753) is slidingly arranged in the limiting sliding groove, the adjusting screw (8751) is threadedly connected at the limiting sliding groove in the inside of the base plate (871), and the lower end of the side adjacent to the butt push rod (873) of the push block (8754) is provided with a matching inclined surface structure.

10. A method for a bridge steel plate welding positioning device, which is suitable for the bridge steel plate welding positioning device according to any one of claims 8-9, characterized in that: The five steps of preheating of the steel plate, feeding of the steel plate, positioning and adjusting of the steel plate, welding of the steel plate, and taking out of the finished product are as follows: S1, preheating of the steel plate: open the blocking door (5), place the steel plate into the preheating box (4), then close the blocking door (5), and preheat the steel plate by the preheating box (4); S2, feeding of the steel plate: start the first driving motor (71), the first driving motor (71) drives the driving wheel (72) to rotate through the first gear (73) and the second gear (74), the driving wheel (72) drives the lifting screw (76) connected thereto to rotate, and another driving wheel (72) and the lifting screw (76) connected thereto are driven to rotate through the belt (75), so that the first driving motor (71) carries the steel plate to move upward, then start the electric push rod (62), the electric push rod (62) drives the push block (63) to push the steel plate into the outer frame body (81), and the rotating end head (8752) is also rotated, so that the adjusting screw (8751) moves downward to drive the push block (8754) to move downward and push the abutting push rod (873) to move, so that the insertion rod (876) is inserted into the slot of the compression roller (89), the compression roller (89) is driven to rotate, and the steel plate is fed into the outer frame body (81); S3, positioning and adjusting of the steel plate: after the steel plate enters the outer frame body (81), the support buckle (83) is buckled and fixed, and the positioning clamping structure (8) on one side is rotated according to the requirement, so that the steel plate forms the required angle in the two positioning clamping structures (8), and the angle of rotation is determined according to the dial (3); S4, welding of the steel plate: manually weld the butt joint end of the two steel plates after angle adjustment; S5, taking out of the finished product: take out the product after welding.

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