Welding fixture

Abstract

The utility model discloses a welding fixture, which relates to the technical field of electric vehicle production and manufacturing, and comprises a first fixing module, a second fixing module and a third fixing module, the first fixing module is provided with a first station and a second station, the first station is used for fixing a head tube, the second station is used for fixing a rear limiting piece, and the third fixing module is provided with a third limiting piece. The first fixing module is constructed to enable the rear limiting piece on the second station to be in contact with the welding position of the rear limiting piece of the head tube on the first station; the second fixing module is provided with a third station, the third station is used for fixing a head pipe welded with a rear limiting piece, the third fixing module is provided with a fourth station, the fourth station is used for fixing a reinforcing box and a front beam pipe, and one end of the reinforcing box located on the third station is in contact with one end of the front beam pipe. And the other end is in contact with the reinforcing box welding position of the head pipe on the third station. By means of the welding clamp, the welding quality and strength between the rear limiting piece and the head pipe can be higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric motor car welding production technical field, in particular to a kind of welding fixture. BACKGROUND

[0002] At present, the production of electric motor car head needs to weld and assemble rear limiting sheet, front beam pipe, head pipe and reinforcing box. In the current welding process, rear limiting sheet needs to be welded on the rear limiting sheet welding position on head pipe, one end of reinforcing box is welded with one end of front beam pipe, and the other end is welded at the reinforcing box welding position of head pipe, but since reinforcing box welding position and rear limiting sheet welding position are located on the same side of head pipe, and the above welding steps are completed simultaneously, front beam pipe and reinforcing box are easy to interfere with the welding of rear limiting sheet, and the welding gun at rear limiting sheet often has insufficient accessibility problem, cannot be full welding according to drawing requirements, resulting in insufficient quality and strength of welding at rear limiting sheet. Therefore, a welding fixture capable of making the welding quality and strength between rear limiting sheet and head pipe higher is urgently needed. SUMMARY

[0003] The utility model aims at providing a kind of welding fixture to solve the problems existing in the prior art, so that the welding quality and strength between rear limiting sheet and head pipe are higher.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] The utility model provides a kind of welding fixture, it includes: first fixed module, second fixed module and third fixed module, the first fixed module has first work position and second work position on it, the first work position is used to fix head pipe on it, the second work position is used to fix rear limiting sheet on it, the first fixed module is configured to make the rear limiting sheet on the second work position contact with the rear limiting sheet welding position of head pipe on first work position;The third work position has on the second fixed module, the third work position is used to fix the head pipe welded with rear limiting sheet, the fourth work position has on the third fixed module, the fourth work position is used to fix reinforcing box and front beam pipe, one end of the reinforcing box on the fourth work position contact with one end of the front beam pipe, and the other end contact with the reinforcing box welding position of the head pipe on the third work position.

[0006] Preferably, the support structure further comprises a support frame, the first fixing module comprises a first positioning piece, a first limiting piece and a first pressing assembly, the first positioning piece and the first limiting piece are fixedly connected to one side of the support frame, a first positioning pin is fixedly arranged on the first positioning piece, the first positioning pin is vertically arranged, the first limiting piece is provided with a first limiting groove, the first limiting groove is located above the first positioning pin and corresponds to the position of the first positioning pin in the vertical direction, the first limiting groove and the first positioning pin form the first station, the first pressing assembly has a first free end, the second station is located on the first free end, the free end can move and make the rear limiting sheet on the second station contact the rear limiting sheet welding position of the head tube on the first station.

[0007] Preferably, the first pressing assembly comprises a first cylinder, a first connecting piece and a first positioning block, the first cylinder is fixedly connected to the support frame, one end of the first connecting piece is fixedly connected to the piston rod of the first cylinder, the first positioning block is detachably connected to the first connecting piece, the first positioning block forms the first free end, the first positioning block has an installation position, the installation position forms the second station, the installation position is arranged opposite to the rear limiting sheet welding position of the head tube on the first station, the first cylinder can drive the rear limiting sheet on the installation position to contact or move away from the rear limiting sheet welding position of the head tube on the first station.

[0008] Preferably, the second fixing module comprises a second positioning piece, a second limiting piece and a second pressing assembly, the second positioning piece, the second limiting piece and the second pressing assembly are fixedly connected to the support frame, a second positioning pin is vertically arranged on the second positioning piece, the second limiting piece is provided with a second limiting groove, the second limiting groove is located above the second positioning pin and corresponds to the position of the second positioning pin, the second positioning pin and the second limiting groove form the third station, the second pressing assembly has a second free end, the second free end is located directly above the second positioning pin and can reciprocate in the vertical direction.

[0009] Preferably, the second pressing assembly comprises a second cylinder, a second connecting piece, a guide piece, a pressing rod, a guide plate and a second positioning block, the second cylinder is fixedly connected to the support frame, a piston rod of the second cylinder is vertically arranged, one end of the second connecting piece is fixedly connected to the piston rod of the second cylinder, the other end of the second connecting piece is hingedly connected to one end of the guide piece around a horizontal rotating shaft, the guide plate is fixedly connected to the support frame, the guide plate is provided with a guide groove, the guide groove comprises a straight section and an arc section, the straight section extends upward from the bottom of the guide plate in the vertical direction, one end of the arc section is a first end, the other end is a second end, the first end is through the upper end of the straight section, the arc section extends away from the head tube on the third station from the first end to the second end, a first guide pin is fixedly arranged on the side of the second connecting piece facing the guide plate, a second guide pin is arranged on the side of the guide piece facing the guide plate, the first guide pin and the second guide pin are both slidingly connected in the guide groove, one end of the pressing rod is fixedly connected to the end of the guide piece away from the second connecting piece, the other end of the pressing rod is detachably connected with the second positioning block, and the second positioning block forms the second free end.

[0010] Preferably, the third cylinder is further arranged, the support frame is provided with an intermediate plate, the intermediate plate is horizontally arranged, the second positioning piece is fixedly connected to the upper side of the intermediate plate, the second positioning piece is provided with a first displacement hole, the intermediate plate is provided with a second displacement hole, the first displacement hole is through the first displacement hole, the third cylinder is fixedly connected to the lower side of the intermediate plate, a piston rod of the third cylinder extends into the second displacement hole and the first displacement hole, and the lower end of the second positioning pin is fixedly connected to the piston rod of the third cylinder.

[0011] Preferably, the third fixing module comprises a third fixing piece, a third pressing assembly and an adjusting structure, the third fixing piece is fixedly connected to the support frame, the third fixing piece is provided with a clamping groove, the third pressing assembly has a third free end, the third free end can be close to or away from the third fixing piece to press the reinforcing box, the support structure further comprises a bottom plate, the support frame and the adjusting structure are fixedly connected to the upper side of the bottom plate, the adjusting structure has a fourth free end, the fourth free end is provided with an open upward end fixed groove, the extension direction of the clamping groove passes through the reinforcing box welding position of the head tube arranged on the second station and the end fixed groove, the end fixed groove is used for arranging the end of the front beam tube, the clamping groove and the end fixed groove form the fourth station, and the fourth free end can move in the horizontal and vertical directions to change the position of the end of the front beam tube.

[0012] Preferably, the third pressing assembly comprises a fourth cylinder and a third positioning block, the fourth cylinder is fixedly connected to the third fixing member, the fourth cylinder is a lever type cylinder, and the third positioning block is detachably connected to a pressing arm of the fourth cylinder, and the third positioning block forms the third free end.

[0013] Preferably, the adjusting structure comprises a clamping block, a first sliding block and a second sliding block, the clamping block is detachably arranged on the bottom plate, a gasket can be arranged between the clamping block and the bottom plate, the first sliding block is slidably connected to an upper side of the clamping block along a first straight line, the second sliding block is slidably connected to the first sliding block along a second straight line, the first straight line is perpendicular to the second straight line, and the second sliding block forms the fourth free end.

[0014] Preferably, the adjusting structure further comprises a first adjusting block, a second adjusting block, a first bolt, a second bolt, a third bolt and a fourth bolt, the first adjusting block is fixedly connected to an upper side of the clamping block, the first adjusting block is located on one side of the first sliding block on the first straight line, the second adjusting block is fixedly connected to the first sliding block, the second adjusting block is located on one side of the second sliding block on the second straight line, the first adjusting block is provided with a first through hole and a first screw hole, the second adjusting block is provided with a second through hole and a second screw hole, a side surface of the first sliding block is provided with a third screw hole corresponding to a position of the first through hole, a side surface of the second sliding block is provided with a fourth screw hole corresponding to a position of the second through hole, the first bolt is inserted into the first through hole and is threadedly connected with the third screw hole, the second bolt passes through the first screw hole and is threadedly connected with the first screw hole, the third bolt is inserted into the second through hole and is threadedly connected with the fourth screw hole, and the fourth bolt passes through the second screw hole and is threadedly connected with the second screw hole.

[0015] The utility model discloses the following technical effects are obtained relative to prior art:

[0016] The welding fixture provided by the utility model, when welding the head of the electric vehicle, the head pipe and the rear limiting sheet are arranged on the first work station and the second work station respectively, then the rear limiting sheet is contacted with the preset rear limiting sheet welding position on the head pipe, and then the welding of the rear limiting sheet and the head pipe can be completed through the welding tool. After that, the head pipe welded with the rear limiting sheet is taken off from the first work station and arranged on the third work station, the reinforcing box and the front beam pipe are arranged on the fourth work station, one end of the reinforcing box is contacted with the welding position on the side surface of the head pipe, and the other end is contacted with one end of the front beam pipe, and then the combined welding between the head pipe, the reinforcing box and the front beam pipe can be completed through the welding tool. Through the welding of the head pipe and the rear limiting sheet first, and then the combined welding of the head pipe, the front beam pipe and the reinforcing box, the original welding step is divided into two steps, the quality stability of each welding pass is ensured, the influence of the reinforcing box and the front beam pipe on the welding of the rear limiting sheet is effectively avoided, and the quality and the strength of the welding of the rear limiting sheet are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0018] Figure 1 The utility model provides the perspective view of the welding fixture;

[0019] Figure 2 The utility model relates to a welding fixture Figure 1 The utility model relates to a welding fixture

[0020] Figure 3 The utility model relates to a welding fixture Figure 1 The utility model relates to a welding fixture

[0021] Figure 4 The utility model relates to a welding fixture Figure 3 The utility model relates to a welding fixture

[0022] Figure 5 The utility model relates to a welding fixture Figure 1 The utility model relates to a welding fixture

[0023] In the figure: 1, first fixed module; 11, first positioning piece; 111, first positioning pin; 12, first limiting piece; 121, first limiting groove; 13, first air cylinder; 14, first connecting piece; 15, first positioning block; 2, second fixed module; 21, second positioning piece; 211, second positioning pin; 22, second air cylinder; 23, second connecting piece; 231, first guide pin; 24, guide piece; 241, second guide pin; 25, pressing rod; 26, guide plate; 262, guide groove; 263, straight section; 264, arc section; 27, second positioning block; 28, second limiting piece; 281, second limiting groove; 29, third air cylinder; 3, third fixed module; 31, third fixed piece; 311, clamping groove; 32, adjusting structure; 321, clamping block; 322, first sliding block; 3221, third screw hole; 323, second sliding block; 3231, fourth screw hole; 3232, end fixed groove; 324, first adjusting block; 3241, first through hole; 3242, first screw hole; 325, second adjusting block; 3251, second through hole; 3252, second screw hole; 33, fourth air cylinder; 34, pressing arm; 35, third positioning block; 4, support frame; 5, bottom plate; 6, middle plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0025] The utility model aims at providing a kind of welding fixture to solve the problems existing in the prior art, make the welding quality and strength between rear limiting sheet and head tube higher.

[0026] To make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0027] The utility model provides a kind of welding fixture, such as Figures 1-5As shown, comprising: first fixed module 1, second fixed module 2 and third fixed module 3, the first fixed module 1 has first station and second station, the first station is used for fixing head tube, the second station is used for fixing rear limiting piece, the first fixed module 1 is configured to make the rear limiting piece on the second station and the rear limiting piece welding position of head tube on the first station contact;The second fixed module 2 has third station, the third station is used for fixing the head tube welded with rear limiting piece, the third fixed module 3 has fourth station, the fourth station is used for fixing the reinforcing box and front beam tube, the reinforcing box on the fourth station one end and the front beam tube one end contact, the other end and the reinforcing box welding position of head tube on the third station contact.

[0028] The welding fixture provided by the utility model, when the head of the electric vehicle is welded, the head tube and the rear limiting piece are arranged on the first station and the second station respectively, then the rear limiting piece is contacted with the preset rear limiting piece welding position on the head tube, and then the welding of the rear limiting piece and the head tube can be completed by the welding tool. After that, the head tube welded with the rear limiting piece is taken off from the first station and arranged on the third station, and the reinforcing box and the front beam tube are arranged on the fourth station, so that one end of the reinforcing box is contacted with the welding position of the side surface of the head tube, and the other end is contacted with one end of the front beam tube, and then the combined welding between the head tube, the reinforcing box and the front beam tube can be completed by the welding tool. By welding the head tube and the rear limiting piece first, and then combining the head tube, the front beam tube and the reinforcing box, the original welding step is divided into two steps, the quality stability of each welding pass is ensured, the influence of the reinforcing box and the front beam tube on the welding of the rear limiting piece is effectively avoided, and the quality and strength of the welding of the rear limiting piece are improved.

[0029] In a preferred embodiment of the present embodiment, the support structure further comprises a support frame 4, the first fixing module 1 comprises a first positioning member 11, a first limiting member 12 and a first pressing assembly, the first positioning member 11 and the first limiting member 12 are both fixedly connected to one side of the support frame 4, the first positioning member 11 is fixedly provided with a first positioning pin 111, the first positioning pin 111 is vertically arranged, the first limiting member 12 is provided with a first limiting groove 121, the first limiting groove 121 is located above the first positioning pin 111 and corresponds to the position of the first positioning pin 111 in the vertical direction, the first limiting groove 121 and the first positioning pin 111 form a first station, the first pressing assembly has a first free end, a second station is located on the first free end, the free end can move and make the rear limiting piece on the second station contact the rear limiting piece welding position of the head tube on the first station. When welding the head tube and the rear limiting piece, the head tube is inserted on the limiting pin and clamped in the first limiting groove 121, the fixation of the head tube is completed, then the rear limiting piece is contacted with the rear limiting piece welding position on the head tube through the movement of the first free end, the positioning is completed, then the welding can be completed through the welding tool.

[0030] In a preferred embodiment of the present embodiment, the first pressing assembly comprises a first air cylinder 13, a first connecting member 14 and a first positioning block 15, the first air cylinder 13 is fixedly connected to the support frame 4, one end of the first connecting member 14 is fixedly connected to the piston rod of the first air cylinder 13, the first positioning block 15 is detachably connected to the first connecting member 14, the first positioning block 15 forms the first free end, the first positioning block 15 has an installation site, the installation site forms a second station, the installation site is arranged opposite to the rear limiting piece welding position of the head tube on the first station, the first air cylinder 13 can drive the first positioning block 15 to approach or move away from the head tube on the first station. Because the size of the rear limiting piece is different corresponding to different vehicle models, the first positioning block 15 is designed to be detachably connected, instead of the original welding connection mode, so that different first positioning blocks 15 can be replaced according to the size of different rear limiting pieces, thereby improving the application range of the device. The first air cylinder 13 is a three-piston rod air cylinder, and the first connecting member 14 is fixedly connected to the end portions of the three piston rods.

[0031] In a preferred embodiment of the present embodiment, the second fixing module 2 comprises a second positioning member 21, a second limiting member 28 and a second pressing assembly, the second positioning member 21, the second limiting member 28 and the second pressing assembly are fixedly connected to the support frame 4, the second positioning member 21 is vertically provided with a second positioning pin 211, the second limiting member 28 is provided with a second limiting groove 281, the second limiting groove 281 is located above the second positioning pin 211 and corresponds to the position of the second positioning pin 211, the second positioning pin 211 and the second limiting groove 281 form a third station, the second pressing assembly has a second free end, the second free end is located directly above the second positioning pin 211 and can reciprocate in the vertical direction. After the welding of the head tube and the rear limiting sheet is completed, the head tube with the welded rear limiting sheet is removed, inserted on the second positioning pin 211 and clamped in the second limiting groove 281, then the second free end moves downward and presses the head tube, completing the fixation of the head tube.

[0032] In a preferred embodiment of the present application, the second pressing assembly comprises a second cylinder 22, a second connecting piece 23, a guide piece 24, a pressing rod 25, a guide plate 26 and a second positioning block 27. The second cylinder 22 is fixedly connected to the support frame 4, and the piston rod of the second cylinder 22 is arranged vertically. One end of the second connecting piece 23 is fixedly connected to the piston rod of the second cylinder 22, and the other end of the second connecting piece 23 is hingedly connected to one end of the guide piece 24 about a horizontal pivot axis. The guide plate 26 is fixedly connected to the support frame 4, and the guide plate 26 is provided with a guide groove 262. The guide groove 262 comprises a straight section 263 and an arc section 264. The straight section 263 extends upward from the bottom of the guide plate 26 in the vertical direction. One end of the arc section 264 is a first end, and the other end is a second end. The first end is in communication with the upper end of the straight section 263. The arc section 264 extends away from the head tube arranged at the third station from the first end to the second end. A first guide pin 231 is fixedly arranged on the side of the second connecting piece 23 facing the guide plate 26. A second guide pin 241 is arranged on the side of the guide piece 24 facing the guide plate 26. The first guide pin 231 and the second guide pin 241 are both slidingly connected in the guide groove 262. One end of the pressing rod 25 is fixedly connected to the end of the guide piece 24 away from the second connecting piece 23. The other end of the pressing rod 25 is detachably connected to the second positioning block 27. The second positioning block 27 forms a second free end. When the head tube needs to be pressed, the piston rod of the second cylinder 22 moves downward, the first guide pin 231 and the second guide pin 241 slide along the guide groove 262, and the second positioning block 27 is pressed on the head tube. After the head tube is welded, the head tube needs to be removed. The piston rod of the second cylinder 22 moves upward, the first guide pin 231 slides upward along the straight section 263, and the second guide pin 241 first slides upward along the straight section 263. At this time, the second positioning block 27 slides upward in the vertical direction and then obliquely upward along the arc section 264 away from the head tube. At this time, the second positioning block 27 gradually moves away from the extension line of the head tube in the horizontal direction while sliding upward in the vertical direction. The space above the head tube is not blocked, and the head tube can be easily removed. Moreover, the second positioning block 27 is detachably connected to the second connecting piece 23, and the second positioning block 27 can be replaced at any time to adapt to head tubes of different sizes. The guide plate 26 is provided with two guide plates 26 arranged on opposite sides of the guide piece 24. The second connecting piece 23 is provided with a first guide pin 231 on each side. The two first guide pins 231 are slidingly connected in the guide grooves 262 on the two guide plates 26, respectively. The guide piece 24 is provided with a second guide pin 241 on each opposite side. The two second guide pins 241 are slidingly connected in the guide grooves 262 on the two guide plates 26, respectively.

[0033] In a preferred embodiment of the present application, the third cylinder 29 is further included, the support frame 4 has a middle plate 6, the middle plate 6 is horizontally arranged, the second positioning member 21 is fixedly connected to the upper side of the middle plate 6, the first displacement hole is arranged on the second positioning member 21, the second displacement hole is arranged on the middle plate 6, the first displacement hole and the first displacement hole are through, the third cylinder 29 is fixedly connected to the lower side of the middle plate 6, the piston rod of the third cylinder 29 extends into the second displacement hole and the first displacement hole, and the lower end of the second positioning pin 211 is fixedly connected to the piston rod of the third cylinder 29. Due to the influence of welding stress in the welding process, the head tube and its are prone to deformation in the welding process, which will cause the head tube to be stuck in the head from the second positioning pin 211, and it is more difficult to remove. By arranging the third cylinder 29, the piston rod of the third cylinder 29 is controlled to move downward, the second positioning pin 211 moves downward, and the second positioning pin 211 can be extracted from the head tube, so that the head tube is convenient to remove after welding is completed.

[0034] In a preferred embodiment of the present application, the third fixing module 3 includes a third fixing member 31, a third pressing assembly and an adjusting structure 32, the third fixing member 31 is fixedly connected to the support frame 4, the third fixing member is provided with a clamping groove 311, the third pressing assembly has a third free end, the third free end can be close to or away from the third fixing member to press the reinforcing box, the support structure further includes a bottom plate 5, the support frame 4 and the adjusting structure 32 are fixedly connected to the upper side of the bottom plate 5, the adjusting structure 32 has a fourth free end, the fourth free end is provided with an end fixed groove 3232 with an opening upward, the extension direction of the clamping groove 311 passes through the reinforcing box welding position of the head tube arranged on the second station and the end fixed groove 3232, the end fixed groove 3232 is used for arranging the end of the front beam tube, the clamping groove 311 and the end fixed groove 3232 form a fourth station, and the fourth free end can move in the horizontal and vertical directions to change the position of the end of the front beam tube. The front beam tube and the reinforcing box are arranged in the clamping groove 311, and the third free end of the third pressing assembly is used for pressing the reinforcing box, at this time, one end of the reinforcing box is in contact with the side surface of the head tube arranged on the third station, the other end of the reinforcing box is in contact with one end of the front beam tube, and the other end of the front beam tube is arranged in the end fixed groove 3232, so that the fixing of the reinforcing box and the front beam tube is completed. Due to the influence of welding thermal deformation, the welding stress on the front beam tube will cause the position to deviate, by arranging the adjusting structure and adjusting the position of the fourth free end according to the pre-calculated deformation amount before welding, the influence of the welding stress can be offset, so that the welding quality is improved.

[0035] In a preferred embodiment of the present application, the third pressing assembly comprises a fourth cylinder 33 and a third positioning block 35. The fourth cylinder 33 is fixedly connected to the third fixing member, and is a lever type cylinder. The third positioning block 35 is detachably connected to a pressing arm 34 of the fourth cylinder 35, and forms a third free end. The detachable third positioning block 35 can be replaced according to the size of the reinforcing box by the worker, thereby improving the application range of the device.

[0036] In order to facilitate the adjustment of the front beam pipe position, in a preferred embodiment of the present application, the adjusting structure 32 comprises a clamping block 321, a first sliding block 322 and a second sliding block 323. The clamping block 321 is detachably connected to the bottom plate 5, and a gasket can be arranged between the clamping block 321 and the bottom plate 5. The first sliding block 322 is slidably connected to the upper side of the clamping block 321 along a first straight line, and the second sliding block 323 is slidably connected to the first sliding block 322 along a second straight line. The first straight line and the second straight line are perpendicular to each other, and the second sliding block 323 forms a fourth free end. The horizontal position of the end of the front beam pipe can be changed by sliding the first sliding block 322 and the second sliding block 323, and the vertical position of the end of the front beam pipe can be changed by detaching the clamping block 321 and arranging a gasket between the clamping block 321 and the bottom plate 5. The clamping block 321 is detachably connected to the bottom plate 5 by a bolt.

[0037] In a preferred embodiment of the present embodiment, the adjusting structure 32 further comprises a first adjusting block 324, a second adjusting block 325, a first screw, a second screw, a third screw and a fourth screw. The first adjusting block 324 is fixedly connected to the upper side of the clamping block 321 and is located on one side of the first sliding block 322 along the first straight line. The second adjusting block 325 is fixedly connected to the first sliding block 322 and is located on one side of the second sliding block 323 along the second straight line. The first adjusting block 324 is provided with a first through hole 3241 and a first screw hole 3242. The second adjusting block 325 is provided with a second through hole 3251 and a second screw hole 3252. The side surface of the first sliding block 322 is provided with a third screw hole 3221 corresponding to the position of the first through hole 3241. The side surface of the second sliding block 323 is provided with a fourth screw hole 3231 corresponding to the position of the second through hole 3251. The first screw is inserted into the first through hole 3241 and is threadedly connected with the third screw hole 3221. The second screw is inserted through the first screw hole 3242 and is threadedly connected with the first screw hole 3242. The third screw is inserted into the second through hole 3251 and is threadedly connected with the fourth screw hole 3231. The fourth screw is inserted through the second screw hole 3252 and is threadedly connected with the second screw hole 3252. Taking the first sliding block 322 as an example, when it is necessary to increase the distance between the first sliding block 322 and the first adjusting block 324, the first screw in the third screw hole 3221 is unscrewed, and then the second screw in the second screw hole 3252 is screwed, so that the end of the second screw pushes the first sliding block 322 away from the first adjusting block 324. When it is necessary to reduce the distance between the second sliding block 323 and the first adjusting block 324, the second screw in the second screw hole 3252 is unscrewed, and then the first screw is inserted through the first through hole 3241 and into the third screw hole 3221. The nut of the third screw is abutted against the periphery of the first through hole 3241. With the increase of the depth of the first screw in the third screw hole 3221, the first sliding block 322 slides towards the first adjusting block 324. The adjusting mode of the second sliding block 323 is the same as that of the first sliding block 322. By arranging the first adjusting block 324, the second adjusting block 325 and the plurality of screw holes and through holes and cooperating with the screws for adjustment, the convenience of adjustment is further improved.

[0038] It should be noted that the first positioning block 15 and the first connecting piece 14, the second positioning block 27 and the second connecting piece 23, and the third positioning block 35 and the connecting rod are detachably connected through bolts.

[0039] The principle and implementation mode of the utility model are described by applying specific examples, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A welding fixture, characterized by: The utility model relates to a kind of welding positioner, including: First fixed module, second fixed module and third fixed module, the first fixed module has first station and second station on it, the first station is used to fix head tube, the second station is used to fix rear limiting sheet, the first fixed module is configured to make the rear limiting sheet on the second station contact with the rear limiting sheet welding position of head tube on the first station;The third station is used to fix the head tube welded with rear limiting sheet on the second fixed module;The fourth station is used to fix the strengthening box and front beam tube on the third fixed module, one end of the strengthening box on the fourth station contacts with one end of the front beam tube, and the other end contacts with the strengthening box welding position of the head tube on the third station.

2. The welding fixture of claim 1, wherein: It further includes a support structure, the first fixed module includes a first positioning member, a first limiting member and a first pressing assembly, the first positioning member and the first limiting member are fixedly connected on one side of the support frame, a first positioning pin is fixedly provided on the first positioning member, the first positioning pin is vertically arranged, a first limiting groove is provided on the first limiting member, the first limiting groove is located above the first positioning pin and corresponds to the position of the first positioning pin in the vertical direction, the first limiting groove and the first positioning pin form the first station, the first pressing assembly has a first free end, the second station is located on the first free end, the free end can move and make the rear limiting sheet on the second station contact with the rear limiting sheet welding position of head tube on the first station.

3. The welding fixture of claim 2, wherein: The first pressing assembly includes a first cylinder, a first connecting member and a first positioning block, the first cylinder is fixedly connected to the support frame, one end of the first connecting member is fixedly connected to the piston rod of the first cylinder, the first positioning block is detachably connected to the first connecting member, the first positioning block forms the first free end, the first positioning block has one mounting position, the mounting position forms the second station, the mounting position is arranged opposite to the rear limiting sheet welding position of head tube on the first station, the first cylinder can drive the rear limiting sheet on the mounting position to contact or away from the rear limiting sheet welding position of head tube on the first station.

4. The welding fixture of claim 2, wherein: The second fixed module includes a second positioning member, a second limiting member and a second pressing assembly, the second positioning member, the second limiting member and the second pressing assembly are fixedly connected to the support frame, a second positioning pin is vertically arranged on the second positioning member, a second limiting groove is provided on the second limiting member, the second limiting groove is located above the second positioning pin and corresponds to the position of the second positioning pin, the second positioning pin and the second limiting groove form the third station, the second pressing assembly has a second free end, the second free end is located directly above the second positioning pin and can reciprocate in the vertical direction.

5. The welding fixture of claim 4, wherein: The second pressing assembly comprises a second cylinder, a second connecting piece, a guide piece, a pressing rod, a guide plate and a second positioning block, the second cylinder is fixedly connected to the support frame, a piston rod of the second cylinder is vertically arranged, one end of the second connecting piece is fixedly connected to the piston rod of the second cylinder, the other end of the second connecting piece is hingedly connected to one end of the guide piece around a horizontal rotating shaft, the guide plate is fixedly connected to the support frame, the guide plate is provided with a guide groove, the guide groove comprises a straight section and an arc section, the straight section extends upward from the bottom of the guide plate in the vertical direction, one end of the arc section is a first end, the other end is a second end, the first end is through the upper end of the straight section, the arc section extends away from the head tube arranged on the third station from the first end to the second end, a first guide pin is fixedly arranged on the side surface of the second connecting piece facing the guide plate, a second guide pin is arranged on the side surface of the guide piece facing the guide plate, the first guide pin and the second guide pin are both slidingly connected in the guide groove, one end of the pressing rod is fixedly connected to the end of the guide piece away from the second connecting piece, the other end of the pressing rod is detachably connected with the second positioning block, and the second positioning block forms the second free end.

6. The welding fixture of claim 4, wherein: A third cylinder is further included, the support frame has an intermediate plate, the intermediate plate is horizontally arranged, the second positioning piece is fixedly connected to the upper side of the intermediate plate, the second positioning piece is provided with a first displacement hole, the intermediate plate is provided with a second displacement hole, the first displacement hole is through the first displacement hole, the third cylinder is fixedly connected to the lower side of the intermediate plate, a piston rod of the third cylinder extends into the second displacement hole and the first displacement hole, and a lower end of the second positioning pin is fixedly connected to the piston rod of the third cylinder.

7. The welding fixture of claim 2, wherein: The third fixing module comprises a third fixing piece, a third pressing assembly and an adjusting structure, the third fixing piece is fixedly connected to the support frame, the third fixing piece is provided with a clamping groove, the third pressing assembly has a third free end, the third free end can be close to or away from the third fixing piece to press the reinforcing box, the support structure further comprises a bottom plate, the support frame and the adjusting structure are fixedly connected to the upper side of the bottom plate, the adjusting structure has a fourth free end, the fourth free end is provided with an end fixed groove with an opening upward, the extension direction of the clamping groove passes through the reinforcing box welding position of the head tube arranged on the second station and the end fixed groove, the end fixed groove is used for arranging the end portion of the front beam tube, and the clamping groove and the end fixed groove form the fourth station. The fourth free end can move in the horizontal and vertical directions to change the position of the end portion of the front beam tube.

8. The welding fixture of claim 7, wherein: The third pressing assembly comprises a fourth cylinder and a third positioning block, the fourth cylinder is fixedly connected to the third fixing part, the fourth cylinder is a lever type cylinder, the third positioning block is detachably connected to a pressing arm of the fourth cylinder, and the third positioning block forms the third free end.

9. The welding fixture of claim 7, wherein: The adjusting structure comprises a clamping block, a first sliding block and a second sliding block, the clamping block is detachably arranged on the bottom plate, a gasket can be arranged between the clamping block and the bottom plate, the first sliding block is slidably connected to an upper side of the clamping block along a first straight line, the second sliding block is slidably connected to the first sliding block along a second straight line, the first straight line and the second straight line are perpendicular to each other, and the second sliding block forms the fourth free end.

10. The welding fixture of claim 9, wherein: The adjusting structure further comprises a first adjusting block, a second adjusting block, a first bolt, a second bolt, a third bolt and a fourth bolt, the first adjusting block is fixedly connected to an upper side of the clamping block, the first adjusting block is located on one side of the first sliding block on the first straight line, the second adjusting block is fixedly connected to the first sliding block, the second adjusting block is located on one side of the second sliding block on the second straight line, the first adjusting block is provided with a first through hole and a first screw hole, the second adjusting block is provided with a second through hole and a second screw hole, a side surface of the first sliding block is provided with a third screw hole corresponding to a position of the first through hole, a side surface of the second sliding block is provided with a fourth screw hole corresponding to a position of the second through hole, the first bolt is inserted into the first through hole and is threadedly connected with the third screw hole, the second bolt passes through the first screw hole and is threadedly connected with the first screw hole, the third bolt is inserted into the second through hole and is threadedly connected with the fourth screw hole, and the fourth bolt passes through the second screw hole and is threadedly connected with the second screw hole.

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