Automatic welding device for rear large seat skeleton assembly stud

Abstract

The utility model discloses a kind of rear big seat skeleton assembly stud automatic welding device, it is related to stud welding technical field, to solve the technical problem that current stud welding mode can lead to stud deviation inclination, causes welding quality defect, including mechanical arm and connecting arm, the connecting arm end is provided with positioning mechanism, the auxiliary mechanism is arranged in the positioning mechanism inside.The utility model can accurately correct and fix stud on the center axis of discharging channel by the guiding slope of tapering groove through ball bearing uniform push all positioning blocks synchronous radial shrink, completely constrain the radial degree of freedom of stud, avoid stud deviation due to uneven stress generation.Simultaneously, the axis of welding head body coincides with the center axis of discharging channel, after stud centering, welding head body can accurately butt joint stud top end, solve the current stud welding mode can lead to stud deviation inclination, causes welding quality defect problem.

Description

Technical Field

[0001] This utility model relates to the field of stud welding technology, and more specifically, to an automatic stud welding device for rear seat frame assembly. Background Technology

[0002] In the automotive parts manufacturing industry, the rear seat frame assembly, as a key structural component bearing the core functions of the seat, directly affects the overall strength and safety performance of the seat due to the reliability of its stud connections. The welding process between the studs and the frame assembly is the core link to ensure a stable connection between the two, requiring extremely high precision in the welding position, the perpendicularity of the studs, and the consistency of the welded structure.

[0003] Existing stud welding methods employ simple single-point pushing to fix the stud. Typically, a single-sided cylinder or push rod applies force to the stud, limiting displacement only in a single direction and failing to provide uniform circumferential constraint. This deviation not only directly disrupts the ideal contact state between the stud's welded end face and the workpiece surface, leading to uneven contact resistance, but more seriously, at the moment the welding head is pressed down and energized, this unstable clamping state cannot effectively constrain further displacement that may be caused by electromagnetic forces or mechanical vibrations. The ultimate result is that the stud cannot guarantee absolute perpendicularity to the welding surface, leading to welding position deviations, insufficient weld strength, and even serious quality problems such as incomplete welds and false welds, directly affecting the reliability and safety of the product structure. Therefore, we propose an automatic stud welding device for the rear large seat frame assembly. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide an automatic welding device for the rear seat frame assembly studs, so as to solve the technical problem that the current stud welding method is prone to stud offset and tilting, causing welding quality defects.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an automatic welding device for studs of a rear seat frame assembly, including a robotic arm and a connecting arm. The connecting arm is provided with a positioning mechanism at its end. An auxiliary mechanism is provided inside the positioning mechanism. The positioning mechanism includes a fixed sleeve and positioning blocks. The positioning blocks are connected to the connecting arm and are circumferentially distributed inside the fixed sleeve. Multiple positioning blocks form a feeding channel for accommodating studs. A rotating ball is provided on the top of the positioning block. The auxiliary mechanism includes a rotating sleeve, which is located inside the fixed sleeve. The rotating sleeve has a tapered groove inside, and the groove wall of the tapered groove forms a guide slope. The rotating sleeve can rotate and move axially relative to the fixed sleeve. Its movement, through the cooperation of the guide slope and the rotating ball, drives multiple positioning blocks to move radially synchronously, thereby clamping or releasing the studs.

[0006] Preferably, the positioning mechanism further includes a first spring, which is fixedly installed inside the fixed sleeve. A telescopic sleeve is fixedly installed at the end of the first spring away from the fixed sleeve. An anti-slip pad is fixedly installed at the bottom of the telescopic sleeve. A second spring and a damping telescopic rod are fixedly installed between the fixed sleeve and the positioning block. The second spring is sleeved on the outside of the damping telescopic rod. A fixed slide rail is fixedly installed on the inner wall of the fixed sleeve. A limiting slider that is slidably installed inside the fixed slide rail is fixedly installed on the outside of the positioning block.

[0007] Preferably, the auxiliary mechanism further includes a spiral groove, which is formed on the outside of the rotating sleeve. A limiting post is fixedly installed inside the fixed sleeve at a position corresponding to the spiral groove. The limiting post is embedded inside the spiral groove. An insulating elastic block is fixedly installed on the inner side of the positioning block.

[0008] Preferably, the telescopic sleeve is slidably installed inside the fixed sleeve.

[0009] Preferably, the fixed sleeve has a welding head body inside, and the rotating sleeve is rotatably mounted on the outside of the welding head body.

[0010] Preferably, the axis of the welding head body coincides with the central axis of the feeding channel.

[0011] Preferably, the spiral groove is a continuously closed annular groove.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model utilizes the guide slope of the tapered groove to uniformly push all positioning blocks to radially contract synchronously, precisely correcting and fixing the stud on the central axis of the feeding channel. This completely constrains the radial degree of freedom of the stud, preventing it from shifting due to uneven force. Simultaneously, the axis of the welding head body coincides with the central axis of the feeding channel. After the stud is centered, the welding head body can precisely align with the top of the stud, eliminating the problem of inaccurate welding position caused by stud offset or coaxiality deviation at its source. This ensures absolutely accurate welding position, significantly improving the connection consistency between the stud and the frame assembly, reducing welding errors between different workpieces, and solving the problem of stud offset and tilting, leading to welding quality defects, that current stud welding methods easily cause.

[0013] 2. This utility model also utilizes a spiral groove on the outside of the rotating sleeve, which, in conjunction with a limiting post inside the fixed sleeve, precisely converts the axial movement of the rotating sleeve into stable rotation. This ensures that the inner wall of the tapered groove inside the rotating sleeve contacts the rotating balls synchronously and evenly, preventing uneven force on the rotating balls due to imbalance in the rotation of the rotating sleeve. This, in turn, ensures the synchronicity of the radial contraction of all positioning blocks, providing a stable operating basis for the centering accuracy of the stud and preventing stud misalignment caused by lag in the movement of some positioning blocks. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 This is a schematic diagram of the external structure of the positioning mechanism of this utility model; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a cross-sectional structural diagram of the positioning mechanism of this utility model; Figure 5 This is a schematic diagram of the spiral groove and related structures of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the rotating sleeve of this utility model; Figure 7 This is a schematic diagram of the bottom structure of this utility model; Figure 8 This is a schematic diagram of the positioning block and related structures of this utility model.

[0015] The following are the labels in the diagram: 1. Fixed base; 2. Positioning mechanism; 21. Fixed sleeve; 22. First spring; 23. Telescopic sleeve; 231. Anti-slip pad; 24. Second spring; 241. Damping telescopic rod; 25. Positioning block; 251. Rotating ball; 252. Limiting slider; 26. Insulating elastic block; 27. Fixed slide rail; 3. Auxiliary mechanism; 31. Rotating sleeve; 32. Spiral groove; 33. Gradient groove; 34. Limiting post; 4. Robotic arm; 41. Connecting arm; 5. Welding head body. Detailed Implementation

[0016] Example: Figures 1 to 8As shown, this utility model relates to an automatic welding device for studs of a rear seat frame assembly, including a robotic arm 4 and a connecting arm 41. A positioning mechanism 2 is provided at the end of the connecting arm 41, and an auxiliary mechanism 3 is provided inside the positioning mechanism 2. The positioning mechanism 2 includes a fixed sleeve 21 and positioning blocks 25. The positioning blocks 25 are connected to the connecting arm 41 and are circumferentially distributed inside the fixed sleeve 21. Multiple positioning blocks 25 form a feeding channel for accommodating studs. A rotating ball 251 is provided on the top of the positioning blocks 25. The auxiliary mechanism 3 includes a rotating sleeve 31. A welding head body 5 is provided inside the fixed sleeve 21. The axis of the welding head body 5 coincides with the central axis of the feeding channel. The rotating sleeve 31 is rotatably mounted. Outside the welding head body 5, a rotating sleeve 31 is set inside the fixed sleeve 21. The rotating sleeve 31 has a tapered groove 33 inside, and the groove wall of the tapered groove 33 forms a guide slope. The rotating sleeve 31 can rotate and move axially relative to the fixed sleeve 21. Its movement is driven by the cooperation of the guide slope and the rotating ball 251 to drive multiple positioning blocks 25 to move radially synchronously, so as to clamp or loosen the stud. This utility model uses the guide slope of the tapered groove 33 to push all positioning blocks 25 to shrink radially synchronously through the rotating ball 251, which can accurately correct and fix the stud on the central axis of the feeding channel, completely constrain the radial degree of freedom of the stud, and avoid the stud from shifting due to uneven force. Meanwhile, the axis of the welding head body 5 coincides with the central axis of the feeding channel. After the stud is centered, the welding head body 5 can accurately connect with the top of the stud, eliminating the problem of inaccurate welding position caused by stud offset or coaxiality deviation from the root, ensuring absolute welding position accuracy, significantly improving the connection consistency between the stud and the skeleton assembly, reducing welding errors between different workpieces, and solving the problem that the current stud welding method is prone to stud offset and tilting, causing welding quality defects.

[0017] It should be noted that the welding head body 5 is existing technology. Its core function is to realize the welding operation between the stud and the rear seat frame assembly. The specific structure and working principle are in line with conventional design in this field and do not involve the innovation of this application. The details are as follows: The welding head body 5 typically consists of a conductive electrode, a drive assembly, a cooling module, and a control unit. The conductive electrode, as the core component for current conduction, connects to an external welding power source at one end and contacts the stud tip at the other. It is used to stably transmit current to the contact point between the stud and the frame assembly during the welding stage, forming a weld pool. The drive assembly often uses a cylinder or servo motor to drive the welding head body 5 in axial reciprocating motion, achieving precise alignment before welding, contact with the stud tip, and reset after welding. Its stroke and speed can be preset by an external control system to adapt to the welding requirements of studs of different specifications. The cooling module generally integrates water-cooling channels or heat dissipation fins to absorb heat generated by the conductive electrode and surrounding components during welding, preventing performance degradation or decreased welding accuracy due to high temperatures.

[0018] Furthermore, the positioning mechanism 2 also includes a first spring 22, which is fixedly installed inside the fixed sleeve 21. A telescopic sleeve 23 is fixedly installed at the end of the first spring 22 away from the fixed sleeve 21. The telescopic sleeve 23 is slidably installed inside the fixed sleeve 21. An anti-slip pad 231 is fixedly installed at the bottom of the telescopic sleeve 23. A second spring 24 and a damping telescopic rod 241 are fixedly installed between the fixed sleeve 21 and the positioning block 25. The second spring 24 is sleeved on the outside of the damping telescopic rod 241. The inner wall of the fixed sleeve 21 is fixedly fitted with... Equipped with a fixed slide rail 27, a limiting slider 252 is fixedly installed on the outside of the positioning block 25 and slidably installed inside the fixed slide rail 27. When the device approaches the frame assembly, the anti-slip pad 231 at the bottom of the telescopic sleeve 23 contacts the frame surface first. The first spring 22 can buffer the impact force brought by the robotic arm 4, avoiding hard contact between the device and the frame and causing surface damage. At the same time, the contact positioning of the anti-slip pad 231 can realize the pre-positioning of the device and the frame assembly, laying the foundation for the precise centering of the subsequent studs, reducing the centering adjustment time, and indirectly improving the work efficiency.

[0019] Furthermore, the auxiliary mechanism 3 also includes a spiral groove 32, which is a continuously closed annular groove. The spiral groove 32 is formed on the outside of the rotating sleeve 31. A limit post 34 is fixedly installed inside the fixed sleeve 21 at a position corresponding to the spiral groove 32. The limit post 34 is embedded inside the spiral groove 32. An insulating elastic block 26 is fixedly installed on the inner side of the positioning block 25. Through the spiral groove 32 formed on the outside of the rotating sleeve 31, and the limit post 34 inside the fixed sleeve 21, the axial movement of the rotating sleeve 31 can be accurately converted into stable rotation. This ensures that the inner wall of the tapered groove 33 inside the rotating sleeve 31 contacts the ball bearing 251 synchronously and evenly, avoiding uneven force on the ball bearing 251 due to the imbalance of the rotating sleeve 31's movement. This ensures the synchronicity of the radial contraction of all positioning blocks 25, providing a stable action basis for the centering accuracy of the stud and preventing stud skewing caused by the lag in the action of some positioning blocks 25.

[0020] Working principle: This embodiment provides an automatic welding device for rear seat frame assembly studs. In use, the stud is placed in the feeding channel surrounded by multiple positioning blocks 25. The insulating elastic block 26 inside the positioning block 25 is in a relaxed state, which only plays a slight pre-clamping role on the stud to prevent it from falling, but it is not completely centered. The connecting arm 41 is controlled by the robotic arm 4 to move the fixed sleeve 21 to the position where the stud needs to be welded. First, the stud contacts the welding area, so that the anti-slip pad 231 contacts the surface of the frame assembly. The anti-slip pad 231 pushes the telescopic sleeve 23 to squeeze the first spring 22, thereby causing the telescopic sleeve 23 to retract into the fixed sleeve 21. At this time, the welding head body 5 is started and moves downward, thereby driving the rotating sleeve 31, which is rotatably installed outside the welding head body 5, to move downward. Thus, the spiral groove 32 opened on the outside of the rotating sleeve 31 is limited by the limiting post 34 fixedly installed inside the fixed sleeve 21, so that the rotating sleeve 31 rotates.

[0021] As the rotating sleeve 31 rotates, it moves downward, causing the tapered groove 33 inside the rotating sleeve 31 to contact the rotating ball 251 on the top of the positioning block 25. As the rotating sleeve 31 rotates and presses down, the rotating ball 251 on the top of the positioning block 25 pushes all the positioning blocks 25 radially toward the center in a uniform and synchronous manner, causing the second spring 24 to deform and store energy. The insulating elastic block 26 on the inner side of the positioning block 25 then tightens, uniformly gripping the stud from all sides, accurately correcting and fixing it on the central axis of the feeding channel. At this time, the radial degree of freedom of the stud is completely restricted. After the stud is fully centered and clamped, the welding head body 5 also moves down to the final position and contacts the top of the stud. Since the stud has been rigidly centered, when the welding is applied, the stud will not shift or tilt, ensuring that the welding position is absolutely accurate.

[0022] After welding is completed, the welding head body 5 is lifted, the rotating sleeve 31 rises accordingly and rotates in the opposite direction along the spiral groove 32, the pressure of the tapering groove 33 on the positioning block 25 is released, the positioning block 25 is reset outward under the action of the second spring 24, the welded stud is released, and the mechanism returns to its initial state.

[0023] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. An automatic welding device for rear seat frame assembly studs, comprising a robotic arm (4) and a connecting arm (41), characterized in that, The end of the connecting arm (41) is provided with a positioning mechanism (2), and an auxiliary mechanism (3) is provided inside the positioning mechanism (2). The positioning mechanism (2) includes a fixed sleeve (21) and a positioning block (25). The positioning block (25) is connected to the connecting arm (41). The positioning blocks (25) are circumferentially distributed inside the fixed sleeve (21). Multiple positioning blocks (25) form a feeding channel for accommodating studs. A rotating ball (251) is provided on the top of the positioning block (25). The auxiliary mechanism (3) includes a rotating sleeve (31), which is disposed inside the fixed sleeve (21). A tapered groove (33) is provided inside the rotating sleeve (31), and the groove wall of the tapered groove (33) forms a guide slope. The rotating sleeve (31) can rotate and move axially relative to the fixed sleeve (21), and its movement is driven by the cooperation of the guide inclined surface and the ball bearing (251) to drive multiple positioning blocks (25) to generate synchronous radial movement, so as to achieve clamping or loosening of the stud.

2. The automatic welding device for rear seat frame assembly studs according to claim 1, characterized in that, The positioning mechanism (2) further includes a first spring (22), which is fixedly installed inside the fixed sleeve (21). A telescopic sleeve (23) is fixedly installed at the end of the first spring (22) away from the fixed sleeve (21), and an anti-slip pad (231) is fixedly installed at the bottom of the telescopic sleeve (23). A second spring (24) and a damping telescopic rod (241) are fixedly installed between the fixed sleeve (21) and the positioning block (25). The second spring (24) is sleeved on the outside of the damping telescopic rod (241). A fixed slide rail (27) is fixedly installed on the inner wall of the fixed sleeve (21). A limiting slider (252) that is slidably installed inside the fixed slide rail (27) is fixedly installed on the outside of the positioning block (25).

3. The automatic welding device for rear seat frame assembly studs according to claim 2, characterized in that, The auxiliary mechanism (3) also includes a spiral groove (32), which is opened on the outside of the rotating sleeve (31). A limiting post (34) is fixedly installed inside the fixed sleeve (21) at a position corresponding to the spiral groove (32), and the limiting post (34) is embedded inside the spiral groove (32). An insulating elastic block (26) is fixedly installed on the inner side of the positioning block (25).

4. The automatic welding device for rear seat frame assembly studs according to claim 2, characterized in that, The telescopic sleeve (23) is slidably installed inside the fixed sleeve (21).

5. The automatic welding device for rear seat frame assembly studs according to claim 3, characterized in that, The fixed sleeve (21) is provided with a welding head body (5) inside, and the rotating sleeve (31) is rotatably installed on the outside of the welding head body (5).

6. The automatic welding device for rear seat frame assembly studs according to claim 5, characterized in that, The axis of the welding head body (5) coincides with the central axis of the feeding channel.

7. The automatic welding device for rear seat frame assembly studs according to claim 3, characterized in that, The spiral groove (32) is a continuously closed annular groove.

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