Automobile bumper welding positioning device

Abstract

The invention relates to the field of welding positioning, and discloses an automobile bumper welding positioning device which comprises a mounting frame and a positioning mechanism used for fixing automobile bumpers, a limiting mechanism is located at the joint of the two automobile bumpers and comprises two metal plates, and downward pressing assemblies and adjusting mechanisms are fixedly mounted on the metal plates. Comprising an installation box internally and rotatably provided with a positive and negative screw rod, a transmission assembly is arranged on the positive and negative screw rod, a magnetic block is fixedly arranged on the transmission assembly, and magnetic strips with magnetic force increasing in sequence are arranged at the magnetic block, and a clamping plate of a positioning mechanism is matched with a fixing pipe, so that stress generated by heat during welding can be balanced, thermal deformation tensile stress can be counteracted, and welding quality can be improved. Radial expansion and circumferential shrinkage of the pipe wall are limited, the phenomena of oval deformation and misalignment caused by welding heat input are effectively avoided, and the welding point position can be determined.

Description

Technical Field

[0001] The present invention relates to the technical field of welding positioning, and more specifically, it relates to a welding positioning device for an automobile bumper. Background Art

[0002] The front bumper of a modern off-road vehicle not only has an outer shell connected to the vehicle body, but also a steel structure installed externally. The steel structure is mainly composed of multiple metal pipes. These metal pipes need to be connected together by welding. In order to ensure the stability of the weld joint between two pipes, fixtures are usually used to clamp and align the two pipes to avoid affecting the stability of the weld joint due to precision deviation. However, the existing fixtures can only improve the clamping precision as much as possible to ensure the accuracy of the connection. However, during the welding process of the pipes, the heat generated by welding causes deformation at the pipe joint, resulting in the stability of the weld joint.

[0003] In order to minimize the deformation at the pipe joint as much as possible, the operation is usually carried out in the form of spot welding first and then full welding. Spot welding first and then full welding can prevent misalignment and control deformation by initially fixing the pipe position and dispersing the heat input, while ensuring the welding quality and improving the efficiency. However, since spot welding is performed at multiple positions, the distance between the spot welds becomes very important. If the spacing is too large, the connection between the pipes is not tight enough, and it is easy to shift or shake during the welding process; especially during continuous welding, the pipes expand due to heat or are affected by the surface tension of the molten pool, resulting in elliptical deformation and misalignment, leading to irregular weld formation and affecting the welding quality. If the weld spacing is too small, there will be too many spot welds. Too many spot welds will cause the welding heat to be too concentrated, resulting in local overheating of the pipes in the spot welding area and causing elliptical deformation of the pipes. Therefore, we have designed a welding positioning device for an automobile bumper. Summary of the Invention

[0004] The present invention provides a welding positioning device for an automobile bumper, which solves the technical problem that the distances between the spot welds in the related art are different.

[0005] The present invention provides an automobile bumper welding positioning device, which includes a mounting frame and a positioning mechanism for fixing an automobile bumper, a limiting mechanism located at the connection of two automobile bumpers, including two metal plates, on which a pressing component is fixedly installed. When the metal plate moves to the connection of two automobile bumpers, the pressing component controls the arc surface of the connection between the metal plate and the automobile bumper to match; an adjusting mechanism, including a mounting box with a positive and negative screw rod rotatably installed inside, a transmission component is arranged on the positive and negative screw rod, a magnetic block is fixedly installed on the transmission component, and magnetic strips with gradually increasing magnetic force are arranged at the magnetic block. During the process of the metal plate moving to the connection of two automobile bumpers, the magnetic strips control the magnetic block to reduce the distance between the two metal plates; a driving mechanism, including a motor for driving the limiting mechanism and the adjusting mechanism to rotate, and during the welding of two automobile bumpers, the position of the metal plate is adjusted equidistantly.

[0006] As a further optimized solution of the present invention, the positioning mechanism includes a fixed pipe fixedly connected to the mounting frame, and a plurality of grooves are opened inside the fixed pipe; a common screw rod located inside the groove and rotatably connected to the fixed pipe; a first threaded plate slidably installed inside the groove and threadedly connected to the common screw rod; a clamping plate fixedly installed on the first threaded plate; a crown gear rotatably installed on the fixed pipe, on which a first gear is engaged, and the first gear is fixedly connected to the common screw rod.

[0007] As a further optimized solution of the present invention, the adjusting mechanism further includes a connection box fixedly connected to the magnetic strip; a fourth spring fixedly installed inside the connection box; a second toothed plate located inside the connection box and fixedly connected to the fourth spring, and the second toothed plate is fixedly connected to the mounting box; a second threaded plate slidably installed inside the mounting box and rotatably connected to the positive and negative screw rod, and the positive and negative screw rod is fixedly connected to the limiting mechanism.

[0008] As a further optimized solution of the present invention, the adjusting mechanism further includes a first toothed plate slidably connected to the connection box, and the first toothed plate is matched with the second toothed plate; a pull rod slidably installed on the connection box and fixedly connected to the first toothed plate; a third spring sleeved on the pull rod, one end of the third spring is fixedly connected to the first toothed plate, and the other end of the third spring is fixedly connected to the connection box.

[0009] As a further optimized solution of the present invention, the pressing component further includes a connecting rod fixedly connected to the metal plate, and the connecting rod is fixedly connected to the second threaded plate; a first rotating seat fixedly installed on the metal plate, on which a first rotating plate is rotatably connected; a third rotating seat fixedly installed on the connecting rod, on which a second rotating plate is rotatably connected, a second rotating seat fixedly installed on the first rotating plate and rotatably connected to the second rotating plate; a first spring, one end of which is fixedly installed on the second rotating seat and the other end is fixedly installed on the connecting rod.

[0010] As a further optimized solution of the present invention, the transmission assembly includes a driving frame fixedly connected to the magnetic block, and a toothed gear fixedly installed inside the driving frame; a second gear disposed inside the driving frame and fixedly connected to the positive and negative screw rod; a connecting plate fixedly installed on the magnetic block, on which a sliding rod is slidably connected; a slider slidably installed on the installation box and fixedly connected to the sliding rod; a second spring sleeved on the sliding rod, one end of the second spring is fixedly connected to the connecting plate, and the other end of the second spring is fixedly connected to the slider.

[0011] As a further optimized solution of the present invention, the driving mechanism further includes a rotating ring rotatably connected to the fixed tube, the rotating ring is fixedly connected to the installation box, and the rotating ring is fixedly connected to the connection box; a toothed ring fixedly installed on the rotating ring, on which a third gear is meshed; a speed change assembly fixedly installed on the fixed tube and fixedly connected to the third gear.

[0012] As a further optimized solution of the present invention, the speed change assembly includes a driving box fixedly connected to the fixed tube, the driving box is fixedly connected to the motor; a second conical pulley rotatably installed inside the driving box and fixedly connected to the power output shaft of the driving box; a first conical pulley rotatably installed on the driving box and fixedly connected to the adjusting rod, the first conical pulley and the second conical pulley are connected by a driving belt; an adjusting frame sleeved on the driving belt, on which an adjusting rod slidably connected to the driving box is fixedly installed.

[0013] As a further optimized solution of the present invention, a polishing layer is fixedly installed on the metal plate, and the polishing layer fits with the connection parts of the two automobile bumpers due to the bending of the metal plate; a coolant is built in the metal plate.

[0014] As a further optimized solution of the present invention, a metal strip is installed on the metal plate, and a positioning member is installed on the metal strip.

[0015] The beneficial effects of the present invention are as follows: 1. For the automobile bumper welding positioning device of the present invention, through the cooperation of the clamping plate of the positioning mechanism and the fixed tube, and by using the crown gear to drive multiple ordinary screw rods to rotate synchronously, the four-point clamping and fixing of the automobile bumper is realized; combined with the metal plate and the first rotating plate and second rotating plate structures of the limiting mechanism, through the extrusion force of the first spring, the bent end of the metal plate is closely attached to the connection part of the bumper, forming four-point pre-tightening forces and symmetrical constraints in the up, down, left, and right directions; it can not only balance the stress generated by heat during welding, offset the thermal deformation tensile stress, limit the radial expansion and circumferential contraction of the pipe wall, effectively avoid the oval deformation and misalignment phenomenon caused by the welding heat input, but also determine the welding points.

[0016] 2. For the automotive bumper welding positioning device of the present invention, the adjusting mechanism cooperates with a magnetic strip with increasing magnetic force through a magnetic block. When the installation box drives the metal plate close to the bumper, the magnetic block moves from the low-magnetic-force area to the high-magnetic-force area due to magnetic repulsion, driving the rotation of the forward and reverse screw rod to automatically reduce the distance between the two metal plates, and adaptively matching the welding range according to the diameter of the bumper. For bumpers with a small diameter, the number of welding points can be reduced; for bumpers with a large diameter, the distance between welding points can be reasonably controlled to avoid heat concentration caused by excessive welding points or deformation problems caused by improper spacing. At the same time, combined with the timing control of the motor and the speed-changing component of the driving mechanism, by adjusting the transmission ratio of the driving belt, the rotation speed of the metal plate is changed to achieve equidistant spot welding of bumpers with different diameters, reducing the workload of manually switching welding positions.

[0017] 3. For the automotive bumper welding positioning device of the present invention, the grinding layer provided on the metal plate can pre-grind the welding position during the rotation driven by the motor, removing impurities to avoid excessive welding heat and deformation risks caused by the influence of impurities. In addition, the metal plate is internally provided with a coolant, and the metal plate can dissipate heat at intervals after each four-point welding, effectively absorbing and dispersing the welding heat to prevent local overheating. In the full-welding stage, the metal plate fixes the welding torch through a metal strip and a positioning member, automatically moves with the drive of the motor, and cooperates with the four-point limit structure to continuously limit deformation, ensuring that the bumper always remains stable during the spot welding and full-welding processes, improving the regularity of the weld formation and the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the connection schematic diagram of the positioning mechanism and the limiting mechanism of the present invention; Figure 3 is the structural schematic diagram of the positioning structure of the present invention; Figure 4 is the connection schematic diagram of the rotating ring and the positioning mechanism of the present invention; Figure 5 is Figure 4 the enlarged view at A in Figure 6 is the internal structural schematic diagram of the installation box of the present invention; Figure 7 is Figure 6 the enlarged view at B in Figure 8 is the internal structural schematic diagram of the connection box of the present invention; Figure 9 is the connection schematic diagram of the metal plate and the metal strip of the present invention; Figure 10 is the internal structural schematic diagram of the drive box of the present invention.

[0019] In the figure: 1, mounting bracket; 2, positioning mechanism; 201, clamping plate; 202, fixed pipe; 203, first gear; 204, crown gear; 205, ordinary screw; 206, first threaded plate; 3, limiting mechanism; 301, metal plate; 302, metal strip; 303, positioning part; 304, first rotating seat; 305, first spring; 306, first rotating plate; 307, second rotating seat; 308, second rotating plate; 309, third rotating seat; 310, connecting rod; 311, grinding layer; 4, adjusting mechanism; 401, mounting box; 402, second threaded plate; 403, forward and reverse screw; 404, driving frame; 405, second gear; 406, engaging teeth; 407, sliding rod; 408, second spring; 409, connecting plate; 410, slider; 411, magnet; 412, third spring; 413, first toothed plate; 414, connecting box; 415, second toothed plate; 416, magnetic strip; 417, pull rod; 418, fourth spring; 5, driving mechanism; 501, driving box; 502, first cone pulley; 503, adjusting rod; 504, second cone pulley; 505, driving belt; 506, adjusting frame; 507, motor; 508, rotating ring; 509, toothed ring; 510, third gear. Detailed implementation manners

[0020] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described in some examples can also be combined in other examples.

[0021] As Figures 1 to 10 shown, a welding positioning device for an automobile bumper according to an embodiment of the present invention includes a mounting bracket 1 and a positioning mechanism 2 for fixing an automobile bumper; a limiting mechanism 3 is located at the connection of two automobile bumpers, which includes two metal plates 301, and a pressing component is fixedly installed on the metal plate 301. When the metal plate 301 moves to the connection of two automobile bumpers, the pressing component controls the arc surface of the metal plate 301 to match the connection of the automobile bumper; the adjusting mechanism 4 includes a mounting box 401 with a forward and reverse screw 403 rotatably installed inside, a transmission component is arranged on the forward and reverse screw 403, a magnet 411 is fixedly installed on the transmission component, and magnetic strips 416 with gradually increasing magnetic force are arranged at the magnet 411. During the process of the metal plate 301 moving to the connection of two automobile bumpers, the magnetic strip 416 controls the magnet 411 to reduce the distance between the two metal plates 301; the driving mechanism 5 includes a motor 507 for driving the limiting mechanism 3 and the adjusting mechanism 4 to rotate, and when welding two automobile bumpers, the positions of the metal plates 301 are adjusted at equal intervals.

[0022] It should be noted that two automobile bumpers are respectively placed into two positioning mechanisms 2, and the positioning mechanisms 2 are used to clamp the automobile bumpers. The connection part of the two automobile bumpers needs to be located in the middle of the metal plate 301, so that it can just be clamped and limited by the metal plate 301, thus forming four-point limit on the connection part of the two automobile bumpers. In this way, when the automobile bumpers are welded, the connection part of the two automobile bumpers is clamped in the up, down, left and right directions, which can form a pre-tightening force and also form a symmetric constraint to balance the stress caused by heat during welding. The pre-tightening force limit offsets the tensile stress of thermal deformation, directly restricts the radial free expansion of the pipe wall at high welding temperature, and prevents the circumferential shrinkage during cooling, avoiding the elliptical deformation caused by uneven circumferential shrinkage. During the process of the positioning mechanism 2 clamping the automobile bumpers, the metal plate 301 will also move synchronously to clamp the connection part of the two automobile bumpers. During the movement of the two metal plates 301, they will gradually approach, so as to match the corresponding welding range according to the size of the automobile bumpers. Finally, the driving mechanism 5 drives at equal intervals, so that the initially welded solder joints can be evenly distributed at the connection part of the two automobile bumpers, avoiding the distance between multiple spot welds being too large or too small. When the spot weld distance is too large, the metals on both sides of the weld seam are unevenly heated during the full welding process and lack sufficient positioning constraints, so it is easy to deform. When the spot weld distance is too small, it is easy to cause too much heat accumulation at this place and deform due to heat.

[0023] As Figure 2 and Figure 3 shown, the positioning mechanism 2 includes a fixed pipe 202 fixedly connected to the mounting frame 1. A plurality of grooves are provided inside the fixed pipe 202; a common screw 205 is located inside the groove and is rotatably connected to the fixed pipe 202; a first threaded plate 206 is slidably installed inside the groove and is threadedly connected to the common screw 205; a clamping plate 201 is fixedly installed on the first threaded plate 206; a crown gear 204 is rotatably installed on the fixed pipe 202, and a first gear 203 is meshed therewith. The first gear 203 is fixedly connected to the common screw 205.

[0024] It should be noted that the four common screws 205 on the fixed pipe 202 are divided into two groups, with two in each group, and the threads of the two fixed pipes 202 in each group are opposite; first, the automobile bumper is placed inside the fixed pipe 202, and the pipe connection part of the automobile bumper is located inside the metal plate 301. After the automobile bumper is placed, the crown gear 204 is rotated to drive the first gear 203 to rotate. Due to the arrangement of the four common screws 205, the four first threaded plates 206 will approach each other, so that the four clamping plates 201 will also approach each other, and then the automobile bumper is clamped to achieve a fixing effect.

[0025] As Figure 4 and Figure 8As shown, the adjusting mechanism 4 further includes a connection box 414 fixedly connected to the magnetic strip 416; a fourth spring 418 is fixedly installed inside the connection box 414; a second toothed plate 415 is located inside the connection box 414 and is fixedly connected to the fourth spring 418, and the second toothed plate 415 is fixedly connected to the installation box 401; a second threaded plate 402 is slidably installed inside the installation box 401 and is rotatably connected to the positive and negative screw rod 403, and the positive and negative screw rod 403 is fixedly connected to the limiting mechanism 3.

[0026] It should be noted that when the clamping plate 201 needs to clamp the automobile bumper and continuously approaches the automobile bumper, the second toothed plate 415 will continuously approach the automobile bumper due to the action of the fourth spring 418. Since the second toothed plate 415 is fixedly connected to the installation box 401, the installation box 401 will also approach the automobile bumper, and the limiting mechanism 3 connected thereto will also approach the automobile bumper. Finally, the four metal plates 301 perform four-point clamping on the connection part of the two automobile bumpers.

[0027] As Figure 4 and Figure 8 As shown, the adjusting mechanism 4 further includes a first toothed plate 413 slidably connected to the connection box 414, and the first toothed plate 413 is matched with the second toothed plate 415; a pull rod 417 is slidably installed on the connection box 414 and is fixedly connected to the first toothed plate 413; a third spring 412 is sleeved on the pull rod 417, one end of the third spring 412 is fixedly connected to the first toothed plate 413, and the other end of the third spring 412 is fixedly connected to the connection box 414.

[0028] It should be noted that when the second toothed plate 415 is driven to move by the fourth spring 418, the second toothed plate 415 will continuously squeeze the first toothed plate 413 to move. Since the second toothed plate 415 is matched with the first toothed plate 413, the second toothed plate 415 can only move in one direction, so that the metal plate 301 driven by the second toothed plate 415 can only move in one direction, so that the metal plate 301 is closely attached to the connection part of the two automobile bumpers and will not become detached during the working process; when it is not necessary to clamp the automobile bumper, due to the limitation of the matching between the second toothed plate 415 and the first toothed plate 413, the clamping plate 201 cannot move either. In this way, the pull rod 417 can be pulled first to create a gap between the pull rod 417 and the connection box 414, and then an object is placed for limiting in the gap. In this way, the second toothed plate 415 and the first toothed plate 413 will be separated from each other, and then by reversely driving the crown gear 204, the clamping plate 201 can drive the metal plate 301 to return to its original position, which is convenient for next use.

[0029] As Figure 4 and Figure 5As shown in the figure, the pressing component further includes a connecting rod 310 fixedly connected to the metal plate 301. The connecting rod 310 is fixedly connected to the second threaded plate 402. The first rotating seat 304 is fixedly installed on the metal plate 301, and a first rotating plate 306 is rotatably connected thereto. The third rotating seat 309 is fixedly installed on the connecting rod 310, and a second rotating plate 308 is rotatably connected thereto. The second rotating seat 307 is fixedly installed on the first rotating plate 306 and is rotatably connected to the second rotating plate 308. One end of the first spring 305 is fixedly installed on the second rotating seat 307, and the other end is fixedly installed on the connecting rod 310.

[0030] It should be noted that due to the extrusion force of the first spring 305, the included angle between the first rotating plate 306 and the second rotating plate 308 will be increased in advance, so that the bending degree of the metal plate 301 is large. When the metal plate 301 is driven by the fourth spring 418 and the second toothed plate 415 to fit the connection between the two automobile bumpers, the bent end of the metal plate 301 will continuously squeeze the connection between the two automobile bumpers. Since the connection between the two automobile bumpers is fixed, it can only force the metal plate 301 to continuously unfold. In this way, the metal plate 301 will closely fit the connection between the two automobile bumpers and form a clamp. Since there are two connecting rods 310, there are two metal plates 301. Both metal plates 301 are fitted to the connection between the two automobile bumpers. The distance between the two metal plates 301 is the preliminary range of welding. And since there are four groups of metal plates 301, which are located at four points of the connection between the two automobile bumpers respectively, and the two points are symmetric, the four welding ranges can be directly determined. During the welding process, symmetric welding can be realized. Symmetric welding can balance the input of welding heat, make the connection between the two automobile bumpers uniformly heated in all directions, effectively reduce deformations such as bending and twisting caused by local overheating, and improve the dimensional and shape stability of the pipe.

[0031] As Figure 6 and Figure 7 As shown in the figure, the transmission component includes a driving frame 404 fixedly connected to the magnet 411. A toothed card 406 is fixedly installed inside the driving frame 404. The second gear 405 is arranged inside the driving frame 404 and is fixedly connected to the positive and negative screw rod 403. A connecting plate 409 is fixedly installed on the magnet 411, and a sliding rod 407 is slidably connected thereto. A slider 410 is slidably installed on the installation box 401 and is fixedly connected to the sliding rod 407. The second spring 408 is sleeved on the sliding rod 407. One end of the second spring 408 is fixedly connected to the connecting plate 409, and the other end of the second spring 408 is fixedly connected to the slider 410.

[0032] It should be noted that since the magnetic force of the magnetic strip 416 increases gradually and the magnetic strip 416 is fixed inside the connection box 414, while the magnetic block 411 repels the magnetic strip 416 magnetically. When the installation box 401 is connected to the metal plate 301 and continuously moves towards the direction close to the connection of the two vehicle bumpers, the magnetic block 411 will move continuously along with the magnetic strip 416. In this way, the magnetic block 411 will move from the position with weak magnetic force of the magnetic strip 416 to the position with strong magnetic force. Thus, the magnetic force between the magnetic block 411 and the magnetic strip 416 will continuously increase, and then the magnetic block 411 will continuously drive the driving frame 404 to move. The driving frame 404 will make the second gear 405 rotate through the engaging teeth 406, and the second gear 405 will make the left - right screw 403 rotate. In this way, the two second threaded plates 402 thread - connected to the left - right screw 403 will also continuously approach each other, so that the distance between the two metal plates 301 will continuously decrease. Such an operation is to automatically match the welding range according to the diameter of the vehicle bumper. When performing preliminary spot welding on a vehicle bumper with a small diameter, the welding can be carried out according to a reasonable spacing distribution. Since the vehicle bumper has a small diameter, the number of welds that can be dispersed is small, and there will not be many weld points, so the workload is small. For a vehicle bumper with a large diameter, after distributing the weld points according to a reasonable spacing, the number of weld points is too large, and it is necessary to switch positions back and forth for welding, with a large workload. During the process of the two metal plates 301 clamping the vehicle bumper by the synchronous clamping plate 201, the welding range is automatically matched, the welding range is changed, the number of welds is reduced, and the workload of switching welding back and forth is reduced. Moreover, due to the cooperation of the first rotating plate 306, the second rotating plate 308 and the first spring 305, even when the positions of the metal plates 301 at the connection of the two vehicle bumpers are different, the metal plates 301 can be closely attached to the connection of the two vehicle bumpers.

[0033] As Figure 2 shown, the driving mechanism 5 further includes a rotating ring 508 rotatably connected to the fixed tube 202. The rotating ring 508 is fixedly connected to the installation box 401 and fixedly connected to the connection box 414; a toothed ring 509 is fixedly installed on the rotating ring 508, and a third gear 510 is meshed therewith; a speed - changing assembly is fixedly installed on the fixed tube 202 and fixedly connected to the third gear 510.

[0034] As Figure 2 and Figure 10As shown, the speed-changing assembly includes a drive box 501 fixedly connected to the fixed pipe 202, and the drive box 501 is fixedly connected to the motor 507; the second cone pulley 504 is rotatably installed inside the drive box 501 and is fixedly connected to the power output shaft of the drive box 501; the first cone pulley 502 is rotatably installed on the drive box 501 and is fixedly connected to the adjusting rod 503, and the first cone pulley 502 is connected to the second cone pulley 504 through a drive belt 505; the adjusting frame 506 is sleeved on the drive belt 505, and the adjusting rod 503 fixedly installed thereon is slidably connected to the drive box 501.

[0035] It should be noted that since the motor 507 is controlled by a timer and can control the single running time of the motor 507. After the metal plate 301 clamps the connection of the two automobile bumpers, the motor 507 is started. The motor 507 will drive the second cone pulley 504 to rotate, and the second cone pulley 504 will drive the first cone pulley 502 to rotate through the drive belt 505. Subsequently, the first cone pulley 502 will drive the third gear 510 to rotate, and the third gear 510 will drive the toothed ring 509 to rotate. Finally, the rotating ring 508 will drive the metal plate 301 to rotate. In this way, when the metal plate 301 moves to the specified position according to the driving duration of the motor 507, four-point welding is first performed. Subsequently, the motor 507 is controlled to run again, and the motor 507 runs for the specified time again, so that the metal plate 301 moves equidistantly to the next welding position for the next positioning welding. Then, it goes on in turn to complete the preliminary spot welding. When facing automobile bumpers with different diameters, the distance requirements between the two spot welds are also different. In this way, by pulling the adjusting rod 503, the adjusting rod 503 drives the adjusting frame 506, and the adjusting frame 506 drives the drive belt 505, thereby changing the rotation speed finally driven by the motor 507 to the drive box 501. In this way, the driving time remains unchanged, the driving speed changes, and thus the driving path will change, enabling it to adapt to the equidistant fixed-point welding of automobile bumpers with different diameters.

[0036] As Figure 9 shown, a polishing layer 311 is fixedly installed on the metal plate 301, and the polishing layer 311 fits with the connection of the two automobile bumpers due to the bending of the metal plate 301; a coolant is provided inside the metal plate 301.

[0037] It should be noted that during the process of driving the metal plate 301 to rotate by the motor 507, the metal plate 301 will first polish the position to be welded through the polishing layer 311 to ensure the cleanliness of the welding area, avoid excessive welding heat caused by impurities, and prevent the deformation of the automobile bumper. When each welding is completed, the two metal plates 301 are distributed on both sides of the welding point, which can absorb and disperse the heat accumulation during the welding process. Since each welding is a four-point welding, after each metal plate 301 is welded, it will rest for a period of time to dissipate heat for the next welding, providing a good foundation.

[0038] As Figure 9 shown, a metal strip 302 is installed on the metal plate 301, and a positioning member 303 is installed on the metal strip 302.

[0039] It should be noted that the metal plate 301 and the metal strip 302 are slidably connected but can be fixedly connected together by bolts. Both the metal plate 301 and the metal strip 302 are flexible and bendable. After the metal plate 301 clamps the connection of the two automobile bumpers, the metal plate 301 and the metal strip 302 can be fixed together by bolts. The positioning member 303 is a fixed structure of the welding gun and is an existing technology. The positioning member 303 is placed on the metal strip 302 and bolted to the metal strip 302. In this way, when spot welding is completed and full welding is required, the motor 507 can be used to drive the metal plate 301 and the metal strip 302 at a fixed time, and the welding gun will also move accordingly, facilitating full welding without manual support. Since the metal plate 301 is limited at four points, it can always limit the oval deformation of the automobile bumper during both full welding and spot welding processes, preventing its deformation.

[0040] Working principle: Place the automobile bumper into the fixed tube 202, rotate the crown gear 204, the crown gear 204 meshes with the first gear 203, drives the ordinary screw 205 to rotate, drives the first threaded plate 206 to slide, and the clamping plate 201 clamps the bumper to achieve four-point fixation.

[0041] When the positioning mechanism 2 clamps, the mounting box 401 drives the metal plate 301 close to the connection of the bumper. The bent end of the metal plate 301 is squeezed by the bumper, and the first rotating plate 306 and the second rotating plate 308 rotate around the first rotating seat 304, the second rotating seat 307, and the third rotating seat 309, compressing the first spring 305. The metal plate 301 fits the arc surface of the bumper, forming four-point pre-tightening forces in the up, down, left, and right directions.

[0042] When the mounting box 401 approaches the bumper, the magnetic block 411 is repelled due to the increasing magnetic force of the magnetic strip 416, driving the driving frame 404 to drive the gear teeth 406 to move, meshing with the second gear 405, the forward and reverse screw 403 rotates, and the second threaded plate 402 drives the distance between the metal plates 301 to decrease.

[0043] The motor 507 starts, drives the second conical pulley 504, connects to the first conical pulley 502 through the drive belt 505, drives the third gear 510 to engage with the toothed ring 509, and the rotating ring 508 drives the mounting box 401 and the metal plate 301 to rotate.

[0044] When the metal plate 301 rotates, the grinding layer 311 pre-grinds the welding position, removes impurities, and reduces the risk of thermal deformation; the metal plate 301 is internally provided with a coolant to absorb the welding heat and dissipate heat at intervals to prevent local overheating.

[0045] After spot welding is completed, the metal strip 302 fixes the welding torch through the positioning member 303, the motor 507 drives the metal plate 301 to move, and the welding torch moves synchronously with the metal plate 301 to complete full welding. Four-point limit is maintained throughout the process to ensure that the weld formation is regular.

[0046] The above describes the embodiments of the present invention. However, these embodiments are not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative and not restrictive. Under the inspiration of these embodiments, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of these embodiments.

Claims

1. An automobile bumper welding positioning device, comprising a mounting frame (1) and a positioning mechanism (2) for fixing an automobile bumper, characterized in that: A limiting mechanism (3), located at the joint of two automobile bumpers, including two metal plates (301). A pressing component is fixedly installed on the metal plate (301). When the metal plate (301) moves to the joint of the two automobile bumpers, the pressing component controls the arc surface of the metal plate (301) to match the joint of the automobile bumper; An adjusting mechanism (4), including a mounting box (401) with a positive and reverse screw (403) rotatably installed inside. A transmission component is arranged on the positive and reverse screw (403). A magnetic block (411) is fixedly installed on the transmission component. Magnetic strips (416) with gradually increasing magnetic force are arranged at the magnetic block (411). During the process of the metal plate (301) moving to the joint of the two automobile bumpers, the magnetic strips (416) control the magnetic block (411) to reduce the distance between the two metal plates (301); A driving mechanism (5), including a motor (507) for driving the limiting mechanism (3) and the adjusting mechanism (4) to rotate. When welding two automobile bumpers, the position of the metal plate (301) is adjusted at equal intervals.

2. The automotive bumper welding positioning device according to claim 1, wherein: The positioning mechanism (2) includes a fixed pipe (202) fixedly connected to the mounting frame (1). A plurality of grooves are formed inside the fixed pipe (202); A common screw (205), located inside the groove and rotatably connected to the fixed pipe (202); A first threaded plate (206), slidably installed inside the groove and threadedly connected to the common screw (205); A clamping plate (201), fixedly installed on the first threaded plate (206); A crown gear (204), rotatably installed on the fixed pipe (202), meshed with a first gear (203) thereon, and the first gear (203) is fixedly connected to the common screw (205).

3. The automotive bumper welding positioning device according to claim 2, characterized in that: The adjusting mechanism (4) further includes a connection box (414) fixedly connected to the magnetic strip (416); A fourth spring (418), fixedly installed inside the connection box (414); A second toothed plate (415), located inside the connection box (414) and fixedly connected to the fourth spring (418), and the second toothed plate (415) is fixedly connected to the mounting box (401); A second threaded plate (402), slidably installed inside the mounting box (401) and rotatably connected to the positive and reverse screw (403), and the positive and reverse screw (403) is fixedly connected to the limiting mechanism (3).

4. The automotive bumper welding positioning device according to claim 3, wherein: The adjusting mechanism (4) further includes a first toothed plate (413) slidably connected to the connection box (414), and the first toothed plate (413) matches the second toothed plate (415); A pull rod (417), slidably installed on the connection box (414) and fixedly connected to the first toothed plate (413); A third spring (412), sleeved on the pull rod (417), one end of the third spring (412) is fixedly connected to the first toothed plate (413), and the other end of the third spring (412) is fixedly connected to the connection box (414).

5. The automotive bumper welding positioning device according to claim 4, characterized in that: The pressing component further includes a connecting rod (310) fixedly connected to the metal plate (301), and the connecting rod (310) is fixedly connected to the second threaded plate (402); The first rotating seat (304) is fixedly installed on the metal plate (301), and a first rotating plate (306) is rotatably connected thereto; The third rotating seat (309) is fixedly installed on the connecting rod (310), and a second rotating plate (308) is rotatably connected thereto. The second rotating seat (307) is fixedly installed on the first rotating plate (306) and is rotatably connected to the second rotating plate (308); The first spring (305) has one end fixedly installed on the second rotating seat (307) and the other end fixedly installed on the connecting rod (310).

6. The automotive bumper welding positioning device according to claim 5, characterized in that: The transmission component includes a driving frame (404) fixedly connected to the magnetic block (411), and a locking tooth (406) is fixedly installed inside the driving frame (404); The second gear (405) is arranged inside the driving frame (404) and is fixedly connected to the positive and negative screw rod (403); The connecting plate (409) is fixedly installed on the magnetic block (411), and a sliding rod (407) is slidably connected thereto; The slider (410) is slidably installed on the installation box (401) and is fixedly connected to the sliding rod (407); The second spring (408) is sleeved on the sliding rod (407), and one end of the second spring (408) is fixedly connected to the connecting plate (409), and the other end of the second spring (408) is fixedly connected to the slider (410).

7. The automotive bumper welding positioning device according to claim 2, characterized in that: The driving mechanism (5) further includes a rotating ring (508) rotatably connected to the fixed pipe (202), the rotating ring (508) is fixedly connected to the installation box (401), and the rotating ring (508) is fixedly connected to the connection box (414); The toothed ring (509) is fixedly installed on the rotating ring (508), and a third gear (510) is meshed therewith; The speed change component is fixedly installed on the fixed pipe (202) and is fixedly connected to the third gear (510).

8. The automotive bumper welding positioning device according to claim 7, wherein: The speed change component includes a driving box (501) fixedly connected to the fixed pipe (202), and the driving box (501) is fixedly connected to the motor (507); The second cone pulley (504) is rotatably installed inside the driving box (501) and is fixedly connected to the power output shaft of the driving box (501); The first cone pulley (502) is rotatably installed on the driving box (501) and is fixedly connected to the adjusting rod (503), and the first cone pulley (502) is connected to the second cone pulley (504) through a driving belt (505); The adjusting frame (506) is sleeved on the driving belt (505), and an adjusting rod (503) fixedly installed thereon is slidably connected to the driving box (501).

9. The welding positioning device for an automobile bumper according to claim 1, wherein: A polishing layer (311) is fixedly installed on the metal plate (301), and the polishing layer (311) fits against the connection between the two automobile bumpers due to the bending of the metal plate (301); The metal plate (301) contains coolant inside.

10. A welding positioning device for an automobile bumper according to claim 1, characterized in that: A metal strip (302) is installed on the metal plate (301), and a positioning member (303) is installed on the metal strip (302).

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