Automatic arc welding workstation for automobile anti-collision beam

Abstract

The automatic arc welding workstation for the automobile anti-collision beam comprises a workstation body, and the workstation body comprises a platform, a protective wall, a multi-axis welding assembly and a first clamp used for positioning and fixing the anti-collision beam. The hinged hydraulic pipe and the fixedly arranged extension arm are arranged between the two mounting plates, and before welding, the hydraulic pipe and the extension arm are kept parallel and fixed through supporting of the hydraulic sliding part in the hydraulic pipe, so that the two mounting plates are aligned to the same plane, and the welding efficiency is improved. In the welding process, adaptive welding is conducted according to different welding seam sizes through a welding strategy, so that the direction and the position of the welded mounting plate are matched with the automobile frame, stress cannot occur after the mounting plate and the automobile frame are fixed, and the energy absorption protection effect can be better achieved in the collision process of the anti-collision beam and the energy absorption box.

Description

Technical Field

[0001] The invention belongs to the field of automobile parts manufacturing, and in particular relates to an automatic arc welding workstation for automobile anti-collision beams. Background Art

[0002] During the manufacturing process of automobile parts, some of them need to be pre-welded and then fixed to the automobile frame. For example, before the anti-collision beam enters the automobile assembly line, it is necessary to first weld an energy absorption box, then weld a mounting plate on the energy absorption box, and then fix it to the automobile frame through the holes on the surface of the mounting plate.

[0003] In the process of pre-welding the anti-collision beam, automatic welding is generally performed through a welding workstation in the prior art. The welding workstation includes a positioning fixture and a welding device with a multi-axis robotic arm. Since the shape of the anti-collision beam itself is an irregular arc, the contour of the energy absorption box and the docking position of the anti-collision beam need to match. After the energy absorption box is welded to the mounting plate, the two mounting plates need to be located in the same plane. Since the arc-shaped docking surfaces of the anti-collision beam and the energy absorption box have individual differences due to transportation, stacking, clamping deformation and other reasons, it is difficult for the existing positioning device to make the two mounting plates in the same plane after welding. When the two mounting plates are bolted to the automobile frame, they are not flat with each other, and the different forces will form stresses in different directions on the energy absorption box, so that the energy absorption box cannot fully play its role in crushing and absorbing energy. Summary of the invention

[0004] The purpose of the present invention is to provide an automobile anti-collision beam automatic arc welding workstation that can solve the problem of mounting plate welding in order to solve the above-mentioned problem.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] An automated arc welding workstation for an automobile anti-collision beam comprises a platform, a multi-axis welding assembly, and a first fixture for positioning and fixing the anti-collision beam, and further comprises;

[0007] A second fixture, which is used to position and fix the energy absorption box, comprises a first sliding block slidably disposed on the platform, and the second fixture is slidably disposed on the platform, and is used to make the energy absorption box butt with the anti-collision beam;

[0008] The third clamp includes two sliding plates slidably set on the platform for positioning and fixing the mounting plate, one of the sliding plates is provided with an extension arm toward the other sliding plate, and a groove is opened in the extension arm, the other sliding plate is hingedly provided with a hydraulic pipe entering the groove, and the hydraulic pipe has a rotation space in the groove, and the hydraulic pipe is provided with at least two hydraulic sliding parts along the side outward, and the hydraulic sliding part is pushed by the hydraulic pressure to extend outward and press against the inner wall of the extension arm, so that the extension arm and the hydraulic pipe are fixed to each other and parallel, so that the two mounting plates are in the same plane during welding.

[0009] As a further preferred solution, the first fixture is arranged on the platform surface, and includes a positioning platform, a positioning clamping device and a pressing device.

[0010] As a further preferred solution, a pair of slide grooves are provided on the surface of the platform, wherein the first sliding block is slidably disposed in the slide grooves and is driven by a first telescopic cylinder.

[0011] As a further preferred embodiment, the sliding plate is slidably arranged in the sliding groove through the second slider, and the second slider is driven by the second telescopic cylinder, wherein the push and pull force is transmitted between the output end of the second telescopic cylinder and the second slider through an elastic member, and the hydraulic pipe controls the internal hydraulic pressure through a hydraulic generating device.

[0012] As a further preferred solution, a fixing seat is provided on the sliding plate, which is vertically arranged and has positioning pins on its surface corresponding to the holes on the surface of the mounting plate, and is pressed against the mounting plate by a detachable fixing component.

[0013] As a further preferred solution, the second clamp is positioned by engaging with the stripes on the surface of the energy absorbing box, and the energy absorbing box is pressed by providing a pressing piece.

[0014] As a further preferred embodiment, the second clamp is also provided with a structure for detecting the degree of matching between the energy absorption box and the anti-collision beam at the joint, the structure includes a base plate connected to the first slider, and F-shaped brackets are provided on both sides of the base plate, wherein a movable plate is provided between the F-shaped brackets, and the movable plate is used to set a clamping member and fix the energy absorption box, and the upper and lower surfaces of the movable plate are in contact with the F-shaped brackets through balls, and at least two telescopic driving parts are provided on the surface of the base plate, and the output end of the telescopic driving part is sequentially provided with an angle sensor and a conical positioning part, and the lower surface of the movable plate is provided with a positioning groove corresponding to the conical positioning part, and when one of the conical positioning parts is pressed against the positioning groove, the movable plate rotates due to uneven force, and when the two conical positioning parts are pressed against the positioning groove, the movable plate is completely fixed.

[0015] As a further preferred solution, the ball in contact with the upper surface of the movable plate is movably arranged on an F-shaped bracket, and the ball is pressed against the upper surface of the movable plate through a threaded structure.

[0016] The present invention has at least the following beneficial effects:

[0017] The present invention arranges a hinged hydraulic pipe and a fixed extension arm between two mounting plates. Before welding, the hydraulic pipe and the extension arm are kept parallel and fixed by the support of the hydraulic sliding part in the hydraulic pipe, so that the two mounting plates are aligned in the same plane. During welding, adaptive welding is performed according to different weld sizes through welding strategies, so that the direction and position of the mounting plate after welding are adapted to the automobile frame. After the mounting plate and the automobile frame are fixed, no stress will appear, so that the anti-collision beam and the energy absorption box can better exert the energy absorption protection effect during the collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view of the workstation of the present invention.

[0019] Figure 2 The present invention Figure 1 A magnified view of the structure of part A.

[0020] Figure 3 The present invention Figure 1 Enlarged view of the structure of part B.

[0021] Figure 4 The present invention Figure 2 Center CC view.

[0022] Figure 5 The present invention Figure 3 Center DD view.

[0023] Figure 6 This is a schematic diagram of the anti-collision beam before and after welding.

[0024] In the figure: 1. workstation body; 11. platform; 12. protective wall; 13. slide; 14. multi-axis welding assembly; 2. first fixture; 21. positioning table; 22. positioning clamping device; 23. clamping device; 3. second fixture; 31. first slider; 32. base plate; 33. F-type bracket; 34. ball; 35. telescopic drive unit; 36. angle sensor; 37. conical positioning member; 38. movable plate; 39. positioning groove; 310. clamping member; 311. first telescopic cylinder; 4. third fixture; 41. second slider; 42. sliding plate; 43. fixed seat; 44. fixed component; 45. second telescopic cylinder; 46. elastic member; 47. extension arm; 48. hydraulic pipe; 49. hydraulic sliding unit; 410. hydraulic generating device; 51. anti-collision beam; 52. energy absorption box; 53. mounting plate. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings. It should be noted that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Example 1

[0027] like Figure 1-5 As shown, an automatic arc welding workstation for automobile anti-collision beams comprises:

[0028] The workstation body 1 includes a platform 11, a protective wall 12, and a multi-axis welding assembly 14. A pair of slide grooves 13 are provided on the surface of the platform 11. Openings are provided at both ends of the workstation body 1. Protective curtains can also be provided at the openings to facilitate closing during welding. The multi-axis welding assembly 14 adopts an existing multi-axis welding robot arm.

[0029] The first clamp 2 is arranged on the surface of the platform 11, and includes a positioning platform 21, a positioning clamping device 22 and a pressing device 23. The positioning platform 21 has a positioning groove corresponding to the shape of the anti-collision beam 51, and is pressed against the positioning groove by the positioning clamping device 22, and then pressed from top to bottom by the pressing device 23. The positioning clamping device 22 and the pressing device 23 can be electric devices or manually operated, which are all existing clamp technologies and are not described in detail here;

[0030] The second fixture 3 is used to position and fix the energy absorption box 52, including a first slider 31 slidably arranged on the platform 11, the first slider 31 is slidably arranged in the slide groove 13, and is driven by the first telescopic cylinder 311. The second fixture 3 is slidably arranged on the platform 11, and is used to make the energy absorption box 52 dock with the anti-collision beam 51, wherein the spacing and orientation of the two energy absorption boxes 52 are fixed by the first slider 31, and after the first slider 31 contacts the anti-collision beam 51, it is welded by the multi-axis welding assembly 14;

[0031] The third clamp 4 includes two sliding plates 42 slidably set on the platform 11 for positioning and fixing the mounting plate 53, wherein one of the sliding plates 42 is provided with an extension arm 47 toward the other sliding plate 42, and a groove is opened in the extension arm 47, and the other sliding plate 42 is hingedly provided with a hydraulic pipe 48 entering the groove, and the hydraulic pipe 48 has a rotation space in the groove, and the hydraulic pipe 48 is provided with at least two hydraulic sliding parts 49 along the side outward, and the hydraulic sliding part 49 is pushed by the hydraulic pressure to extend outward and press against the inner wall of the extension arm 47, so that the extension arm 47 and the hydraulic pipe 48 are fixed to each other and parallel, so that the two mounting plates 53 are in the same plane during welding.

[0032] The sliding plate 42 is slidably arranged in the slide groove 13 through the second sliding block 41, and the second sliding block 41 is driven by the second telescopic cylinder 45, wherein the output end of the second telescopic cylinder 45 and the second sliding block 41 transmit push-pull force through the elastic member 46, and the hydraulic pipe 48 controls the internal hydraulic pressure through the hydraulic generating device 410. In this scheme, the push-pull force is transmitted to the second sliding block 41 through the elastic member 46. The elastic member 46 can be set as a spring, and the two ends are fixed respectively. When the second sliding block 41 is pushed, when the mounting plate 53 contacts the energy absorption box 52, the spring is compressed, so that the two second telescopic cylinders 45 have the same stroke. If the two mounting plates 53 are not aligned front and back, the compression degree of the two springs is different, and the hydraulic pipe 48 deflects slightly in the extension arm 47. At this time, the hydraulic generating device 410 operates to make the hydraulic pipe 48 as Figure 3 As shown in the figure, they are tightly fixed. Due to the different degrees of spring compression, the loosely compressed spring retreats and deepens the compression, so that the two sliding plates 42 are aligned, that is, the two mounting plates 53 are aligned. When the mounting plates 53 are aligned, the retreated mounting plate 53 must have a certain gap with the corresponding energy absorption box 52. A displacement sensor can also be set on the second slider 41 to detect the gap width, so that when welding, the welding strategy can be adjusted according to the gap width. In the existing arc welding process, different welding gaps can be adapted by adjusting welding parameters or other existing means. The welding parameters include welding speed, voltage, current, etc.

[0033] A fixing seat 43 is provided on the sliding plate 42. The fixing seat 43 is vertically arranged. Positioning pins corresponding to the holes on the surface of the mounting plate 53 are provided on its surface, and the fixing seat 43 is pressed on the mounting plate 53 by a detachable fixing component 44. This scheme provides a way to fix the mounting plate 53. Since the surface of the mounting plate 53 itself needs to be fixed to the automobile frame by bolts, its holes can be used as positioning holes and can be fixed by a detachable fixing component 44. The fixing component 44 can be manually or electrically fixed, but it cannot affect the feeding after welding. In this scheme, an L-shaped threaded rod is used, which is tightened and fixed by bolts.

[0034] The second clamp 3 is positioned by engaging with the stripes on the surface of the energy absorbing box 52, and the energy absorbing box 52 is compressed by setting a clamping piece 310. This solution provides a way to fix the energy absorbing box 52. Since the surface of the energy absorbing box 52 is provided with stripes to guide the collapse direction, it itself can be used as a positioning structure and can be compressed and fixed by the clamping piece 310. Similarly, the clamping piece 310 can be manually or electrically operated, and it also cannot affect the unloading after welding.

[0035] Since the installation spacing and installation direction of the two energy absorption boxes 52 are fixed, when they are docked with the arc-shaped anti-collision beam 51, the corresponding part of the anti-collision beam 51 may not match the two vertical sides of the energy absorption box 52, that is, one of the vertical sides is against the anti-collision beam 51, while the other vertical side does not contact the anti-collision beam 51. If a uniform welding parameter is used during the welding process, it may lead to inconsistent firmness of the welds at both ends. In a collision, the energy absorption box 52 is subjected to unbalanced force, resulting in poor collapse energy absorption effect. For this reason, the second fixture 3 is also provided with a structure for detecting the matching degree of the docking point between the energy absorption box 52 and the anti-collision beam 51, and the structure includes a base plate 32 connected to the first slider 31, and F-shaped The bracket 33, wherein a movable plate 38 is arranged between the F-type brackets 33, and the movable plate 38 is used to set the pressing member 310 and fix the energy absorption box 52. The upper and lower surfaces of the movable plate 38 are in contact with the F-type bracket 33 through the ball 34. At least two telescopic drive parts 35 are arranged on the surface of the base plate 32, and the output end of the telescopic drive part 35 is sequentially provided with an angle sensor 36 and a conical positioning member 37. The lower surface of the movable plate 38 is provided with a positioning groove 39 corresponding to the conical positioning member 37. When one of the conical positioning members 37 is pressed against the positioning groove 39, the movable plate 38 rotates due to the uneven force. When the two conical positioning members 37 are pressed against the positioning groove 39, the movable plate 38 is completely fixed. The ball 34 in contact with the upper surface of the movable plate 38 is movably arranged on the F-type bracket 33, and the ball 34 is pressed against the upper surface of the movable plate 38 through a threaded structure.

[0036] In this solution, at least two conical positioning members 37 are provided, such as Figure 4 As shown, the two conical positioning members 37 are aligned with the two sides of the energy absorbing box 52 respectively. Before welding, only one conical positioning member 37 is kept in close contact with the movable plate 38 as the axis of the movable plate 38. When the movable plate 38 is subjected to uneven force, it rotates. The rotation angle is detected by the angle sensor 36, and the approximate correspondence between the rotation angle and the gap size is confirmed through a limited number of experiments. The matching degree of the butt joint surface can be detected by the rotation angle. The following example illustrates that first, the first slider 31 drives the energy absorbing box 52 to move toward the anti-collision beam 51, so as to Figure 4 From the perspective of angle, when only one side of the two vertical sides of the energy absorption box 52 is in contact with the anti-collision beam 51, the movable plate 38 rotates when the conical positioning member 37 on the other side is used as the axis. The angle sensor 36 detects the angle of rotation, which can roughly determine the degree of contact between the two vertical sides of the energy absorption box 52 and the anti-collision beam 51. For the side that does not fit well, the welding parameters are adjusted according to the rotation angle of the angle sensor 36. It should be noted that adjusting the welding strategy according to the different gap sizes is an existing means. When welding is required, the two conical positioning members 37 simultaneously press the movable plate 38 to position the movable plate 38.

[0037] The specific implementation method is as follows: first, the anti-collision beam 51, the energy absorption box 52, and the mounting plate 53 are respectively placed on different clamps for positioning and fixing, and then the fit degree between the energy absorption box 52 and the anti-collision beam 51 is evaluated through the structure in the second clamp 3, and then the two conical positioning members 37 position and fix the movable plate 38, that is, welding is performed. After the welding of the energy absorption box 52 and the anti-collision beam 51 is completed, the gap between the mounting plate 53 and the energy absorption box 52 is detected and evaluated by the second telescopic cylinder 45. If one of the energy absorption boxes 52 has no gap and the other energy absorption box 52 has a gap, the position of the mounting plate 53 with a gap is adjusted by the extension arm 47, that is, the hydraulic pipe 48, so that the two mounting plates 53 are aligned, and then different welding strategies are adopted for the mounting plate 53 with a gap according to the adjustment range, so that the weld is firm and reliable, and the material is unloaded after the welding is completed.

[0038] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof shall not be construed as limiting the scope of the present invention. For those skilled in the art, several modifications and improvements may be made, which shall all fall within the protection scope of the present invention.

Claims

1. An automated arc welding workstation for an automobile anti-collision beam, comprising a platform (11), a multi-axis welding assembly (14), and a first fixture (2) for positioning and fixing the anti-collision beam (51), characterized in that: Also includes; A second fixture (3) for positioning and fixing the energy absorption box (52), comprising a first slider (31) slidably disposed on the platform (11); the second fixture (3) is slidably disposed on the platform (11) and is used to dock the energy absorption box (52) with the anti-collision beam (51); The third clamp (4) comprises two sliding plates (42) slidably arranged on the platform (11) for positioning and fixing the mounting plate (53), wherein one of the sliding plates (42) is provided with an extension arm (47) toward the other sliding plate (42), and a groove is provided in the extension arm (47), and the other sliding plate (42) is hingedly provided with a hydraulic pipe (48) entering the groove, and the hydraulic pipe (48) has a rotation space in the groove, and the hydraulic pipe (48) is provided with at least two hydraulic sliding parts (49) along the side outward, and the hydraulic sliding part (49) is pushed by the hydraulic pressure to extend outward and abut against the inner side wall of the extension arm (47), so that the extension arm (47) and the hydraulic pipe (48) are fixed and parallel to each other, thereby making the two mounting plates (53) in the same plane during welding.

2. The automobile anti-collision beam automatic arc welding workstation according to claim 1 is characterized in that: The first clamp (2) is arranged on the surface of the platform (11), and comprises a positioning platform (21), a positioning clamping device (22) and a pressing device (23).

3. The automobile anti-collision beam automatic arc welding workstation according to claim 1 is characterized in that: A pair of slide grooves (13) are provided on the surface of the platform (11), wherein a first sliding block (31) is slidably disposed in the slide grooves (13) and is driven by a first telescopic cylinder (311).

4. The automobile anti-collision beam automatic arc welding workstation according to claim 3 is characterized in that: The sliding plate (42) is slidably arranged in the sliding groove (13) through the second sliding block (41), and the second sliding block (41) is driven by the second telescopic cylinder (45), wherein the push-pull force is transmitted between the output end of the second telescopic cylinder (45) and the second sliding block (41) through the elastic member (46), and the hydraulic pipe (48) controls the internal hydraulic pressure through the hydraulic generating device (410).

5. The automobile anti-collision beam automatic arc welding workstation according to claim 4 is characterized in that: The sliding plate (42) is provided with a fixing seat (43), which is arranged vertically and has positioning pins corresponding to holes on the surface of the mounting plate (53) on its surface, and is pressed against the mounting plate (53) by a detachable fixing component (44).

6. The automobile anti-collision beam automatic arc welding workstation according to claim 1, characterized in that: The second clamp (3) is positioned by engaging with the stripes on the surface of the energy absorbing box (52), and the energy absorbing box (52) is pressed by providing a pressing piece (310).

7. The automobile anti-collision beam automatic arc welding workstation according to claim 6, characterized in that: The second fixture (3) is also provided with a structure for detecting the matching degree of the joint between the energy absorption box (52) and the anti-collision beam (51), the structure comprising a base plate (32) connected to the first slider (31), and F-shaped brackets (33) are provided on both sides of the base plate (32), wherein a movable plate (38) is provided between the F-shaped brackets (33), and the movable plate (38) is used to set a clamping member (310) and fix the energy absorption box (52), and the upper and lower surfaces of the movable plate (38) are in contact with the F-shaped bracket (33) through the ball bearings (34), and the base plate (38) is provided with a plurality of movable plates (38) and a plurality of movable plates (38) and a plurality of movable plates (38) are provided. At least two telescopic driving parts (35) are arranged on the surface of the plate (32), and the output end of the telescopic driving part (35) is sequentially provided with an angle sensor (36) and a conical positioning piece (37), and the lower surface of the movable plate (38) is provided with a positioning groove (39) corresponding to the conical positioning piece (37), and when one of the conical positioning pieces (37) is pressed against the positioning groove (39), the movable plate (38) rotates due to the unbalanced force, and when the two conical positioning pieces (37) are pressed against the positioning groove (39), the movable plate (38) is completely fixed.

8. The automobile anti-collision beam automatic arc welding workstation according to claim 7, characterized in that: The ball bearing (34) in contact with the upper surface of the movable plate (38) is movably arranged on the F-shaped bracket (33), and the ball bearing (34) is pressed against the upper surface of the movable plate (38) through a threaded structure.

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