Automatic welding device for automobile sheet metal part production

Abstract

The invention relates to the field of automobile sheet metal part welding equipment, and discloses an automatic welding device for automobile sheet metal part production, which comprises a rack, a clamp assembly and a welding mechanism are arranged on the rack, the welding mechanism comprises a second movable bracket, a welding assembly is arranged on the second movable bracket, and the welding assembly comprises a telescopic rod group; a welding gun is hinged to the suspension end of the telescopic rod set, the telescopic rod set comprises a plurality of telescopic joints, an external step is arranged at one end of each telescopic joint, an internal step is arranged at the other end of each telescopic joint, in every two adjacent telescopic joints, one telescopic joint is arranged in the other telescopic joint in a sleeved mode, and the two telescopic joints are prevented from being separated through the external steps and the internal steps. The telescopic joints comprise the head telescopic joint, the tail telescopic joint and at least one middle telescopic joint arranged between the head telescopic joint and the tail telescopic joint, the tail end of the head telescopic joint is connected with the second movable support, the tail end of the tail telescopic joint is connected with the welding gun, and a spring is arranged between the fixing plates on every two adjacent telescopic joints.

Description

Technical Field

[0001] The present invention relates to the field of automobile sheet metal part production equipment, specifically to the field of automobile sheet metal part welding equipment, and particularly to an automatic welding device for automobile sheet metal part production. Background Art

[0002] Welding is one of the processes used in the production of automobile sheet metal parts. Based on a search for automobile sheet metal part welding, a Chinese invention patent with the authorization announcement number CN119282590B was found. It discloses a welding device for local connection of automobile sheet metal parts. During welding, through technologies such as hydraulic telescopic cylinder technology and linear movement of threaded rods, the welding gun is driven to apply welding treatment to the weld seam. These technologies are rigid drives, that is, the driving force is directly applied to the welding gun or the workpiece, causing a relative displacement between the welding gun and the workpiece to achieve welding of the weld seam. There are some deficiencies in rigid drives, for example:

[0003] 1. As is well known, all mechanical equipment will make mistakes during operation. When the above-mentioned welding device is welding, if the feed displacement amount between the welding gun and the workpiece is greater than the set value, then due to the rigid drive, it is extremely easy to cause damage to the welding gun;

[0004] 2. In the existing welding technology, generally several points are welded along the weld seam spacing (usually called spot welding positioning or tack welding), which play roles such as fixing the position of the workpiece, inspecting the assembly quality, and dispersing stress, etc. However, during the subsequent welding process, when the gun head of the welding gun moves to these raised solder joints, the rigid drive method easily causes a rigid touch between the gun head of the welding gun and these solder joints, resulting in a decline in the welding quality at the solder joint, and it is also easy to cause damage to the welding gun head over time.

[0005] Based on the above problems, the present invention proposes an automatic welding device for automobile sheet metal part production. Summary of the Invention

[0006] To solve the problems mentioned in the above background, the present invention provides an automatic welding device for automobile sheet metal part production.

[0007] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows.

[0008] An automatic welding device for automobile sheet metal part production includes a frame, and a fixture assembly and a welding mechanism are arranged on the frame;

[0009] The welding mechanism includes a second movable bracket, a welding assembly is arranged on the second movable bracket, the welding assembly includes a telescopic rod group, one end of the telescopic rod group is provided with a connecting seat, the other end is provided with a support seat, and a welding gun is hinged on the support seat;

[0010] The telescopic rod group includes a plurality of telescopic joints. One end of each telescopic joint is provided with an external step, and the other end is provided with an internal step. One end of the telescopic joint with the external step is further provided with a fixing plate, and a rope-passing hole is formed in the fixing plate.

[0011] Among two adjacent telescopic joints, one telescopic joint is sleeved inside the other telescopic joint, and the cooperation between the external step and the internal step can prevent the two telescopic joints from separating.

[0012] The plurality of telescopic joints include a first telescopic joint, a last telescopic joint, and middle telescopic joints disposed therebetween. There is at least one middle telescopic joint. The end of the first telescopic joint is connected to a connecting seat, and the end of the last telescopic joint is connected to a support.

[0013] A spring is disposed between the fixing plates on two adjacent telescopic joints.

[0014] As a further improvement and optimization of the present invention, the welding assembly further includes a connecting rope and a retractor disposed on the second movable bracket. A plurality of pulleys are disposed on the second movable bracket. One end of the connecting rope is disposed on the retractor, the other end bypasses the pulley, passes through the rope-passing hole, and then is connected to the first telescopic joint.

[0015] As a further improvement and optimization of the present invention, there are two welding assemblies, and a driving member for driving the two welding assemblies to move closer to or away from each other is disposed on the second movable bracket.

[0016] As a further improvement and optimization of the present invention, the driving member includes a fourth motor disposed on the second movable bracket, and a gear is disposed at the output end of the fourth motor.

[0017] Two racks are slidably disposed on the second movable bracket in the vertical direction. The gear is located between the two racks and meshes with the racks.

[0018] A convex seat is disposed at the end of the rack, and the connecting seats of the two welding assemblies are respectively connected to the convex seats on the two racks. The convex seat on one rack is located at its upper end, and the convex seat on the other rack is located at its lower end.

[0019] As a further improvement and optimization of the present invention, the hinge axis formed at the hinge between the support and the welding torch is in power connection with a fifth motor disposed inside the last telescopic joint.

[0020] As a further improvement and optimization of the present invention, the welding mechanism further includes a fixed bracket fixedly disposed on the frame. A first movable bracket is rotatably mounted on the fixed bracket, and the rotation axis two formed at the rotation mounting position is in power connection with a second motor disposed on the fixed bracket.

[0021] The second movable bracket is rotatably mounted on the first movable bracket, and the rotation axis three formed at the rotatable mounting position is in power connection with the third electric motor provided on the first movable bracket;

[0022] Both the rotation axis two and the rotation axis three are horizontally arranged and perpendicular to each other.

[0023] As a further improvement and optimization of the present invention, the fixture assembly includes a horizontal sleeve column slidably arranged on the frame in the vertical direction and a first linear module for driving the horizontal sleeve column to move. The horizontal sleeve column is horizontally arranged, and a horizontal sliding column is slidably arranged in the horizontal sleeve column along its own extending direction. A second linear module for driving the horizontal sliding column to move is provided on the horizontal sleeve column.

[0024] As a further improvement and optimization of the present invention, a rotary bracket is rotatably mounted at the suspended end of the horizontal sliding column, and the rotation axis one formed at the rotatable mounting position is vertically arranged. The rotation axis one is in power connection with the first electric motor provided on the horizontal sliding column.

[0025] As a further improvement and optimization of the present invention, a plurality of vertically arranged columns are provided on the rotary bracket, and negative pressure suction heads are provided at the upper ends of the columns.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] This solution can drive the welding torch to perform welding treatment on the welds at any position of the workpiece. This is one of the cores of this solution. Another core of this solution is that through the cooperation of the retractor and the spring, the length of the telescopic rod group is adjusted, so as to cooperate with other structures to adjust the position of the welding torch and realize the welding operation. The advantages are as follows:

[0028] 1. When the welding torch contacts the welding position of the workpiece, the retractor stops paying out the rope. At this time, if the problem 1 mentioned in the background art occurs, there are two situations. One is that the retractor pays out the rope excessively. Then, at the moment when the connecting rope loosens, the elastic force of the spring will make the extrusion force between the welding torch and the workpiece larger. However, after that, no matter how much the rope is paid out, the extrusion force will not increase. Also, because the elastic force of the spring causes the extrusion force to increase a little, but the driving of the spring is flexible, that is to say, the increase amplitude of the extrusion force is small. Therefore, it can protect the welding torch. On the contrary, in the existing rigid driving technology, as the feeding distance of the welding head becomes larger, the extrusion will be greater and the welding torch will be damaged more seriously. The other is that other linear movement technologies drive the welding torch to feed excessively. Then, due to the existence of the spring in the telescopic rod group, a buffering effect can be achieved. Therefore, it can also protect the welding torch;

[0029] 2. When the problem 2 mentioned in the background art occurs, due to the existence of the spring, when the welding torch passes over the raised solder joint, it will force the spring to contract, making the telescopic rod group shorter, so that the welding torch can easily cross the solder joint and avoid rigid collision between the welding torch and the solder joint, which may cause damage to the welding torch or the solder joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Structural schematic of the present invention Figure 1 ;

[0031] Figure 2 Structural schematic of the present invention Figure 2 ;

[0032] Figure 3 Structural schematic of the present invention Figure 3 ;

[0033] Figure 4 Structural schematic diagram of the fixture assembly;

[0034] Figure 5 Structural schematic of the welding mechanism Figure 1 ;

[0035] Figure 6 Structural schematic of the welding mechanism Figure 2 ;

[0036] Figure 7 Schematic diagram of the driving component and two welding assemblies;

[0037] Figure 8 Schematic diagram of the welding assembly;

[0038] Figure 9 Cross-section of the telescopic rod group Figure 1 ;

[0039] Figure 10 Cross-section of the telescopic rod group Figure 2 ;

[0040] Figure 11 Cross-sectional view of the telescopic section.

[0041] The reference numerals in the drawings are:

[0042] 100, Frame; 200, Fixture assembly; 201, First linear module; 202, Horizontal sleeve column; 203, Second linear module; 204, Horizontal sliding column; 205, First motor; 206, Rotating bracket; 207, Column; 300, Welding mechanism; 301, Fixed bracket; 302, First movable bracket; 303, Second movable bracket; 304, Second motor; 305, Third motor; 306, Fourth motor; 307, Gear; 308, Rack; 3081, Convex seat; 309, Connecting seat; 310, Telescopic rod group; 3101, Spring; 3102, Telescopic joint; 3103, Built-in step; 3104, External step; 3105, Fixed plate; 3106, Rope passing hole; 311, Rewinder; 312, Connecting rope; 313, Support; 314, Welding torch; 315, Fifth motor. Detailed implementation manners

[0043] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0044] In the attached drawings of this solution, a refers to the workpiece to be welded.

[0045] Referring to Figures 1 - 11 , an automatic welding device for automobile sheet metal parts production includes a frame 100, on which a fixture assembly 200 for placing the workpiece to be welded and a welding mechanism 300 for welding the workpiece are provided.

[0046] Fixture assembly 200:

[0047] Referring to Figure 4 , the fixture assembly 200 includes a horizontal sleeve column 202 slidably arranged on the frame 100 in the vertical direction and a first linear module 201 for driving the horizontal sleeve column 202 to move.

[0048] The horizontal sleeve column 202 is horizontally arranged, and a horizontal sliding column 204 is slidably arranged in the horizontal sleeve column 202 along its own extension direction. The horizontal sliding column 204 is driven to move by a second linear module 203, and the second linear module 203 is arranged on the horizontal sleeve column 202.

[0049] The first linear module 201 and the second linear module 203 can adopt existing screw linear movement technology or existing electric telescopic rod technology, etc., which will not be elaborated here.

[0050] The suspended end of the horizontal sliding column 204 is rotatably installed with a rotating bracket 206, and the first rotation axis formed at the rotation installation place is vertically arranged. The first rotation axis is in power connection with a first motor 205, and the first motor 205 is arranged on the horizontal sliding column 204.

[0051] A number of vertically arranged columns 207 are provided on the rotating bracket 206, and negative pressure suction heads are provided at the upper ends of the columns 207.

[0052] Place the workpiece to be welded on a number of negative pressure suction heads. The negative pressure suction heads use the existing negative pressure suction method to restrict the movement of the workpiece, so as to achieve the purpose of clamping the workpiece;

[0053] Through the cooperation of the first linear module 201, the second linear module 203 and the first motor 205, the negative pressure suction head and the workpiece can be driven to move within a three-dimensional coordinate system.

[0054] Welding mechanism 300:

[0055] Refer to Figures 1 - 3 , the welding mechanism 300 is located above the column 207.

[0056] Refer to Figure 5 And Figure 6 , the welding mechanism 300 includes a fixed bracket 301 fixedly arranged on the frame 100. A first movable bracket 302 is rotatably installed on the fixed bracket 301, and the rotation axis two formed at the rotation installation position is in power connection with the second motor 304. The second motor 304 is arranged on the fixed bracket 301.

[0057] A second movable bracket 303 is rotatably installed on the first movable bracket 302, and the rotation axis three formed at the rotation installation position is in power connection with the third motor 305. The third motor 305 is arranged on the first movable bracket 302.

[0058] Both the rotation axis two and the rotation axis three are horizontally arranged. The axial direction of the rotation axis three is parallel to the moving direction of the cross slide column 204, and the rotation axis two and the rotation axis three are perpendicular to each other.

[0059] Refer to Figure 7 And Figure 8 , a welding assembly is provided on the second movable bracket 303. Further, two welding assemblies are provided.

[0060] A driving component for driving the two welding assemblies to move closer to or away from each other is also provided on the second movable bracket 303.

[0061] The driving component includes a fourth motor 306 whose output shaft is parallel to the rotation axis three and is arranged on the second movable bracket 303. A gear 307 is provided at the output end of the fourth motor 306.

[0062] Two racks 308 are slidably arranged on the second movable bracket 303 in the vertical direction. The gear 307 is located between the two racks 308 and the gear 307 meshes with the racks 308.

[0063] The end of the rack 308 is provided with a convex seat 3081, and the two welding assemblies are respectively connected to the convex seats 3081 on the two racks 308. The convex seats 3081 on the two racks 308 are arranged vertically, that is, the convex seat 3081 on one rack 308 is located at the upper end, and the convex seat 3081 on the other rack 308 is located at the lower end.

[0064] The welding assembly includes a telescopic rod group 310. One end of the telescopic rod group 310 is provided with a connecting seat 309. The connecting seat 309 is connected to the convex seat 3081. The other end of the telescopic rod group 310 is provided with a support 313. A welding torch 314 is hinged on the support 313, and the hinge axis formed at the hinge joint is parallel to the second rotation axis. The hinge axis is in power connection with a fifth motor 315 arranged in the telescopic rod group 310.

[0065] Referring to Figures 9 - 11 , the telescopic rod group 310 includes a plurality of telescopic joints 3102. Both ends of the telescopic joint 3102 are open. One end of the telescopic joint 3102 is provided with an external step 3104, and the other end is provided with an internal step 3103. One end of the telescopic joint 3102 provided with the external step 3104 is further provided with a fixing plate 3105, and a rope passing hole 3106 is opened on the fixing plate 3105.

[0066] Among two adjacent telescopic joints 3102, one telescopic joint 3102 is sleeved inside the other telescopic joint 3102, and the cooperation between the external step 3104 and the internal step 3103 is used to prevent the two telescopic joints 3102 from separating.

[0067] The plurality of telescopic joints 3102 include a first telescopic joint, a last telescopic joint and intermediate telescopic joints arranged between the two. There is at least one intermediate telescopic joint. Each of the first telescopic joint and the last telescopic joint has one. The end of the first telescopic joint is connected to the connecting seat 309, and the end of the last telescopic joint is connected to the support 313.

[0068] Springs 3101 are arranged between the fixing plate 3105 on the first telescopic joint and the fixing plate 3105 on the adjacent intermediate telescopic joint, between the fixing plates 3105 on two adjacent intermediate telescopic joints, and between the fixing plate 3105 on the last telescopic joint and the fixing plate 3105 on the adjacent intermediate telescopic joint.

[0069] Referring to Figure 7 And Figure 8 , the welding assembly further includes a retractor 311 arranged on the second movable bracket 303. The retractor 311 can adopt a winch technology, or drive a rope winding drum to rotate for rope winding or rope unwinding through a motor technology, etc., which will not be elaborated.

[0070] One end of the connecting rope 312 is arranged on the retractor 311, and the other end bypasses a pulley, passes through the rope passing hole 3106 and is then connected to the first telescopic joint.

[0071] Working principle of the present invention:

[0072] Place the workpiece to be welded on the negative pressure adsorption head, and use the negative pressure adsorption method to restrict the movement of the workpiece, thereby realizing the clamping of the workpiece;

[0073] Through the cooperation of the first linear module 201, the second linear module 203 and the first motor 205, the clamped workpiece can be driven to move within the three-dimensional coordinate system. Taking the workpiece as a reference, it is equivalent to the welding mechanism 300 moving within the three-dimensional coordinate system;

[0074] Through the cooperation of the second motor 304, the third motor 305, the fifth motor 315 and the telescopic rod group 310, the welding torch 314 can be driven to rotate around the second rotation axis, rotate around the third rotation axis, rotate around the hinge axis, and move along the axis line of the telescopic rod group 310;

[0075] The fourth motor 306 can drive the two welding torches 314 to move closer to or away from each other;

[0076] In summary, this solution can drive the welding torch 314 to weld the weld at any position of the workpiece. This is one of the cores of this solution. Another core of this solution lies in:

[0077] This solution realizes the length adjustment of the telescopic rod group 310 through the cooperation of the retractor 311 and the spring 3101, thereby cooperating with other structures to adjust the position of the welding torch 314 and realize the welding operation. The advantages are as follows:

[0078] 1. When the welding position of the welding torch 314 contacts the workpiece, the retractor 311 stops paying out the rope. At this time, if the problem 1 mentioned in the background technology occurs, there are two situations. One is that the retractor 311 pays out the rope excessively. Then, at the moment when the connecting rope 312 loosens, the elastic force of the spring 3101 will make the extrusion force between the welding torch 314 and the workpiece larger. However, afterwards, no matter how much the rope is paid out, the extrusion force will not increase. Also, because although the elastic force of the spring 3101 causes the extrusion force to increase a little, the spring drive is flexible, that is to say, the increase amplitude of the extrusion force is small. Therefore, it can protect the welding torch 314. On the contrary, in the existing rigid drive technology, as the feeding distance of the welding head becomes larger, the extrusion will be greater, and the welding torch 314 is very easy to be damaged. The other is that other linear movement technologies drive the welding torch 314 to feed excessively. Then, due to the existence of the spring 3101 in the telescopic rod group 310, a buffering effect can be achieved. Therefore, it can also protect the welding torch 314;

[0079] 2. When the problem 2 mentioned in the background art occurs, due to the existence of the spring 3101, when the welding torch 314 passes over the raised solder joint, it will force the spring 3101 to contract, and the telescopic rod group 310 will become shorter, enabling the welding torch 314 to easily cross the solder joint and avoiding rigid collision between the welding torch 314 and the solder joint, which may cause damage to the welding torch 314 or the solder joint.

[0080] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to form equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An automatic welding device for automobile sheet metal parts production, including a frame (100), characterized in that, A fixture assembly (200) and a welding mechanism (300) are provided on a frame (100); The welding mechanism (300) includes a second movable bracket (303). A welding assembly is provided on the second movable bracket (303). The welding assembly includes a telescopic rod group (310). One end of the telescopic rod group (310) is provided with a connecting seat (309), and the other end is provided with a support (313). A welding torch (314) is hingedly provided on the support (313); The telescopic rod group (310) includes a plurality of telescopic joints (3102). One end of the telescopic joint (3102) is provided with an external step (3104), and the other end is provided with an internal step (3103). One end of the telescopic joint (3102) provided with the external step (3104) is further provided with a fixing plate (3105). A rope passing hole (3106) is formed in the fixing plate (3105); Among two adjacent telescopic joints (3102), one telescopic joint (3102) is sleeved inside the other telescopic joint (3102), and the cooperation between the external step (3104) and the internal step (3103) can prevent the two telescopic joints (3102) from separating; The plurality of telescopic joints (3102) include a first telescopic joint, a last telescopic joint, and middle telescopic joints provided therebetween. There is at least one middle telescopic joint. The end of the first telescopic joint is connected to the connecting seat (309), and the end of the last telescopic joint is connected to the support (313); A spring (3101) is provided between the fixing plates (3105) on two adjacent telescopic joints (3102).

2. The automated welding device for the production of automotive sheet metal parts according to claim 1, characterized in that, The welding assembly further includes a connecting rope (312) and a rewinder (311) provided on the second movable bracket (303). A plurality of pulleys are provided on the second movable bracket (303). One end of the connecting rope (312) is provided on the rewinder (311), and the other end bypasses the pulley, passes through the rope passing hole (3106), and then is connected to the first telescopic joint.

3. The automated welding device for the production of automotive sheet metal parts according to claim 2, characterized in that, There are two welding assemblies. A driving component for driving the two welding assemblies to move closer to or away from each other is provided on the second movable bracket (303).

4. An automated welding device for the production of automotive sheet metal parts according to claim 3, characterized in that, The driving component includes a fourth motor (306) provided on the second movable bracket (303). A gear (307) is provided at the output end of the fourth motor (306); Two racks (308) are slidably provided on the second movable bracket (303) in the vertical direction. The gear (307) is located between the two racks (308) and the gear (307) meshes with the racks (308); A convex seat (3081) is provided at the end of the rack (308). The connecting seats (309) of the two welding assemblies are respectively connected to the convex seats (3081) on the two racks (308). The convex seat (3081) on one rack (308) is located at its upper end, and the convex seat (3081) on the other rack (308) is located at its lower end.

5. An automated welding device for the production of automotive sheet metal parts according to claim 1, characterized in that, The hinge axis formed at the hinge between the support (313) and the welding torch (314) is in power connection with a fifth motor (315) provided inside the last telescopic joint.

6. An automated welding device for the production of automotive sheet metal parts according to claim 1 or 3, characterized in that, The welding mechanism (300) further includes a fixed bracket (301) fixedly arranged on the frame (100). A first movable bracket (302) is rotatably installed on the fixed bracket (301), and a second rotating shaft formed at the rotation installation position is in power connection with a second motor (304) arranged on the fixed bracket (301). A second movable bracket (303) is rotatably installed on the first movable bracket (302), and a third rotating shaft formed at the rotation installation position is in power connection with a third motor (305) arranged on the first movable bracket (302). Both the second rotating shaft and the third rotating shaft are horizontally arranged and perpendicular to each other.

7. An automated welding device for the production of automotive sheet metal parts according to claim 6, characterized in that, The fixture assembly (200) includes a horizontal sleeve column (202) slidably arranged on the frame (100) in the vertical direction and a first linear module (201) for driving the horizontal sleeve column (202) to move. The horizontal sleeve column (202) is horizontally arranged. A horizontal sliding column (204) is slidably arranged in the horizontal sleeve column (202) along its own extending direction, and a second linear module (203) for driving the horizontal sliding column (204) to move is arranged on the horizontal sleeve column (202).

8. An automated welding device for producing automobile sheet metal parts according to claim 7, characterized in that, A rotating bracket (206) is rotatably installed at the suspended end of the horizontal sliding column (204), and a first rotating shaft formed at the rotation installation position is vertically arranged. The first rotating shaft is in power connection with a first motor (205) arranged on the horizontal sliding column (204).

9. An automated welding device for the production of automotive sheet metal parts according to claim 8, characterized in that, A plurality of vertically arranged columns (207) are arranged on the rotating bracket (206), and a negative pressure suction head is arranged at the upper end of the column (207).

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