Automobile wire harness terminal pull-out force detection device and method

Abstract

The present application relates to the technical field of pull detection, and discloses a kind of automobile wire harness terminal pull-off force detection device and method, including welding base and the automobile wire harness of lap on welding base, automobile wire harness end removes outer skin and exposes multiple bare wires, welding base has welding column, multiple bare wires lap on the welding column of welding base, two sliding frames are symmetrically slid on welding base, and buckle assembly is connected between sliding frame and automobile wire harness.The present application uses the gap gear of engagement and two meshing gears to drive the second welding wire head welding head of C-shaped rotating plate towards the area that multiple bare wires have not been welded, and then multiple welding is carried out, so that not only the firmness of automobile wire harness and welding base welding can be detected during welding, but also further welding can be carried out for the area that is not firmly welded until the electric control driving motor cannot be opened, which means that automobile wire harness and welding base are firmly welded.

Description

Technical Field

[0001] This invention relates to the field of tensile testing technology, and in particular to a device and method for testing the pull-out force of automotive wiring harness terminals. Background Technology

[0002] An automotive wiring harness terminal pull-out force testing device is a specialized instrument used to test the connection strength between terminals and wires or connecting bases in automotive wiring harnesses. This testing is crucial for ensuring the reliability and safety of automotive electrical systems. This connection method typically involves welding, but welding often results in weak welds and low weld strength. Specifically, the following problems may occur:

[0003] First, during the welding connection of automotive wiring harness terminals, it is necessary to perform a pull test on the automotive wiring harness terminals. However, in the existing technology, the pull-out force test of the wiring harness usually uses a pull device to test whether the wiring harness can be pulled out of the connection base. This pull method can only test whether the connection is firm, but cannot test whether a certain welding area is firm.

[0004] Secondly, if a loose connection occurs during the welding process, it needs to be repaired in time to add a strong point. However, the existing pull-out force detection device does not have a way to strengthen the connection for the loose point. If the automotive wiring harness terminal can be pulled and moved, it means that the weld is not strong, but there are no subsequent strengthening measures, which will lead to a decrease in detection efficiency.

[0005] To address this, we designed a device and method for detecting the pull-out force of automotive wiring harness terminals. Summary of the Invention

[0006] The purpose of this invention is to address the problem that existing pull-out force testing devices do not have a way to reinforce connections at weak points. If the automotive wiring harness terminal can be pulled and moved, it indicates that the welding is not firm, but there are no subsequent reinforcement measures, which leads to a decrease in testing efficiency. Therefore, this invention proposes an automotive wiring harness terminal pull-out force testing device and method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A device for detecting the pull-out force of automotive wiring harness terminals includes a welding base and an automotive wiring harness that overlaps the welding base. The outer sheath of the automotive wiring harness is removed to expose multiple exposed wires. The welding base has welding posts, and the multiple exposed wires overlap the welding posts on the welding base. Two sliding frames slide symmetrically on the welding base, and a snap-fit ​​assembly connects the sliding frames to the automotive wiring harness.

[0009] A fixing frame is fixedly attached to the welding base. The fixing frame has a vertical frame. A wire insertion detector coaxially arranged with the automotive wiring harness is installed on the vertical frame. A first welding wire head connected to the top of the welding column is installed on the vertical frame. A sliding frame assembly is installed on the fixing frame. A supplementary welding component for reinforcing the exposed wire is installed on the sliding frame assembly.

[0010] Preferably, the snap-fit ​​assembly includes:

[0011] Two snap-fit ​​half-rings are fastened to each other on the outer wall of the automotive wiring harness and connected by threaded bolts, with the two snap-fit ​​half-rings pressing against the outer wall of the automotive wiring harness.

[0012] The swing rod has end sleeves at both ends, and a fixed post is fixed on the sliding frame. The end sleeves at both ends of the swing rod are respectively fitted onto the fixed post and the threaded bolt.

[0013] Preferably, the wire insertion detector includes:

[0014] A sleeve with an end plate facing multiple exposed wires, and multiple insertion holes on the end plate. A sensor assembly is also installed inside the sleeve.

[0015] An induction trigger, coaxially aligned with the socket, is provided on the side of the end plate opposite to the exposed wire.

[0016] Preferably, the sliding frame assembly includes:

[0017] Two sliding plates are symmetrically arranged on the fixed frame, and the two sliding plates have the same semi-circular ring plate on the side facing the snap-on semi-ring. The sliding plates are slidably connected to the fixed frame through the sliding groove slider assembly.

[0018] The C-shaped rotating plate rotates on a semi-circular ring plate via an annular groove. The annular groove is coaxial with the C-shaped rotating plate, and the curvature of the annular groove is the same as that of the semi-circular ring plate.

[0019] Preferably, the curvature of the C-shaped rotating plate is greater than that of the annular groove, and the supplementary welding components are set on the C-shaped rotating plate.

[0020] Preferably, the supplementary welding assembly includes:

[0021] A fixing rod and a second welding wire head are provided. The fixing rod is vertically fixed to the C-shaped rotating plate and is connected to the second welding wire head via an elastic curved rod.

[0022] An electromagnetic generator is mounted on a flexible crank. A magnetic plate is also mounted on the C-shaped rotating plate, and a return spring connects the magnetic plate to the electromagnetic generator.

[0023] Preferably, the semi-circular ring plate is symmetrically provided with mounting slots, and each mounting slot is equipped with an electric drive motor. The output end of the electric drive motor is fixed with a meshing gear. The C-shaped rotating plate is provided with a notched gear, which meshes with the two meshing gears.

[0024] Preferably, the two electrically controlled drive motors are connected to the sensor assembly and the induction trigger.

[0025] Preferably, a welding circuit is connected between the second welding wire tip and the first welding wire tip, and the second welding wire tip contacts multiple exposed wires through intermittent oscillation.

[0026] A method for detecting the pull-out force of automotive wiring harness terminals, the specific method is as follows:

[0027] S1: First, the two sliding brackets are slidably set on the welding base. Then, the automotive wiring harness with multiple exposed wires is connected to the welding column on the welding base. The multiple exposed wires are connected to the welding base. Then, the two clips are half-ringed and clipped onto the automotive wiring harness. The clips are connected to the sliding brackets through the swing rod. The external propulsion device is activated to drive the two sliding brackets to move relative to each other or in opposite directions, thereby driving the automotive wiring harness with multiple exposed wires to reciprocate along the cable direction.

[0028] S2: Then fix the fixing bracket clip on the welding base, and let the wire end be inserted into the detector and set coaxially with the car wiring harness. The sliding plate moves together with the second welding wire end on the semi-circular ring plate to change the welding position along the axial direction. Then the first welding wire end on the vertical frame is connected to the welding column, and then the welding circuit is turned on.

[0029] S3: Then turn off the electromagnetic generator that was originally on. As a result, the magnetic attraction of the electromagnetic generator to the magnet plate disappears. Under the combined action of the elastic crank and the return spring, it swings. At this time, the second welding wire head, which was not originally in contact with the multiple exposed wires, will come into contact with the exposed wires. Therefore, the first welding wire head, the welding column, the multiple exposed wires and the second welding wire head will form a connected circuit, allowing the current of the welding circuit to flow through and complete the welding operation.

[0030] S4: After one welding, the external propulsion device is activated to drive the two sliding frames to move in opposite directions, thereby moving the automotive wiring harness, which is held in place by the two snap-fit ​​semi-rings, toward the wire insertion detector. If there are unwelded areas during the welding process, the multiple exposed wires in that area are not welded to the welding base or are not welded to adjacent exposed wires. Therefore, these unfixed exposed wires will move together with the automotive wiring harness. The exposed wires between the welded area and the automotive wiring harness bend during the advancement of the automotive wiring harness, thereby ensuring that the multiple unfixed exposed wires move together with the automotive wiring harness without obstruction.

[0031] S5: Multiple unfixed exposed wires will move along with the vehicle wiring harness until they connect with the wire insertion detector. That is, multiple exposed wires pass through the socket, through the end plate, and into the sleeve. At the same time, they push away the induction trigger that was originally blocking the socket. Therefore, the pushed-away induction trigger will transmit the position electrical signal to the sensor assembly, then process the electrical signal and transmit it to the electronically controlled drive motor. Finally, it controls the number of rotations of the meshing gear at the output end of the electronically controlled drive motor. Finally, through the meshing notched gear and the two meshing gears, the second welding wire head on the C-shaped rotating plate is driven to face the area where multiple exposed wires have not been welded, and perform multiple welding operations.

[0032] The beneficial effects of this invention are as follows:

[0033] 1. The present invention employs the method of shutting down the originally on electromagnetic generator. At this time, the electromagnetic generator, which originally had no attraction to the magnet plate, swings under the combined action of the elastic crank and the return spring. At this time, the second welding wire head, which was not originally in contact with multiple exposed wires, will come into contact with the exposed wires, thus enabling spot welding operation.

[0034] 2. This invention uses a meshing notched gear and two meshing gears to drive the second welding wire head on the C-shaped rotating plate toward multiple exposed wires that have not been welded, thereby performing multiple welding operations. This allows the welding process to not only detect the firmness of the welding between the automotive wiring harness and the welding base, but also to perform further welding on areas where the welding is not firm, until the electric drive motor can no longer be triggered, which means that the automotive wiring harness and the welding base are firmly welded. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of an automotive wiring harness terminal pull-out force detection device proposed in this invention;

[0036] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0037] Figure 3 This is a top view of an automotive wiring harness terminal pull-out force detection device proposed in this invention;

[0038] Figure 4 This is a front view of an automotive wiring harness terminal pull-out force detection device proposed in this invention;

[0039] Figure 5 This is a side view of an automotive wiring harness terminal pull-out force detection device proposed in this invention;

[0040] Figure 6 This is a schematic diagram of the wire insertion detector in an automotive wiring harness terminal pull-out force testing device proposed in this invention;

[0041] Figure 7This is a schematic diagram showing the state of the exposed wire extending into the socket in the automotive wiring harness terminal pull-out force testing device proposed in this invention;

[0042] Figure 8 This is a schematic diagram of the wire insertion detector in an automotive wiring harness terminal pull-out force testing device proposed in this invention;

[0043] Figure 9 This is a schematic diagram of the swing state of the second welding wire head in an automotive wiring harness terminal pull-out force testing device proposed in this invention.

[0044] In the diagram: 1. Welding base; 2. Welding post; 3. Automotive wiring harness; 4. Exposed wire; 5. Clip-on half ring; 6. Threaded bolt; 7. Sliding frame; 8. Fixed post; 9. Swing rod; 10. End sleeve; 11. Fixed frame; 12. Vertical frame; 13. First welding wire tip;

[0045] 14. Wire insertion detector; 141. Sleeve; 142. End plate; 143. Socket; 144. Induction trigger;

[0046] 15. Sliding plate; 16. Semicircular ring plate; 17. C-shaped rotating plate; 18. Fixed rod; 19. Elastic curved rod; 20. Electromagnetic generator; 21. Return spring; 22. Magnet plate; 23. Second welding wire head; 24. Notched gear; 25. Meshing gear; 26. Electric drive motor; 27. Ring groove. Detailed Implementation

[0047] Reference Figures 1-9 A device for detecting the pull-out force of automotive wiring harness terminals includes a welding base 1 and an automotive wiring harness 3 lapped on the welding base 1. The outer sheath of the automotive wiring harness 3 is removed to expose multiple exposed wires 4. The welding base 1 has welding posts 2, and the multiple exposed wires 4 are lapped on the welding posts 2. A gap is left between the end of the automotive wiring harness 3 with the outer sheath and the welding base 1, so as to provide bending space for the subsequent movement of the automotive wiring harness 3.

[0048] The exposed wires 4 at the end of the automotive wiring harness 3 are laid on the welding post 2 for welding the exposed wires 4 to the welding base 1.

[0049] Two sliding frames 7 slide symmetrically on the welding base 1. A snap-fit ​​assembly is connected between the sliding frame 7 and the automotive wiring harness 3. The snap-fit ​​assembly includes two snap-fit ​​half-rings 5, which are snapped against each other on the outer wall of the automotive wiring harness 3. The two snap-fit ​​half-rings 5 ​​are threaded together by a threaded bolt 6. The two snap-fit ​​half-rings 5 ​​press against the outer wall of the automotive wiring harness 3. The snapped two snap-fit ​​half-rings 5 ​​are then disconnected from the automotive wiring harness 3.

[0050] The buckle assembly also includes a swing rod 9, with end sleeves 10 at both ends of the swing rod 9. A fixing post 8 is fixed on the sliding frame 7. The end sleeves 10 at both ends of the swing rod 9 are respectively fitted onto the fixing post 8 and the threaded bolt 6. Therefore, the swing rod 9 is connected to the sliding frame 7. When the external propulsion device is activated, the two sliding frames 7 are moved relative to each other or in opposite directions, causing the automotive wiring harness 3 with multiple exposed wires 4 to reciprocate along the cable direction.

[0051] A fixing frame 11 is fixedly attached to the welding base 1. The fixing frame 11 has a vertical frame 12. The vertical frame 12 is provided with a first welding wire head 13 that connects to the top of the welding column 2. The fixing frame 11 is fixedly attached to the welding base 1, and the wire end is inserted into the detector 14 and coaxially arranged with the automotive wiring harness 3. Then, the first welding wire head 13 on the vertical frame 12 is attached to the top of the welding column 2 on the welding base 1.

[0052] A sliding frame assembly is provided on the fixed frame 11. The sliding frame assembly includes two sliding plates 15. The two sliding plates 15 are symmetrically arranged on the fixed frame 11, and the two sliding plates 15 have the same semi-circular ring plate 16 on the side facing the snap-fit ​​semi-ring 5. The sliding plates 15 are slidably connected to the fixed frame 11 through a sliding groove slider assembly. The sliding plates 15 are driven by an external pushing mechanism, which moves the semi-circular ring plate 16 on the sliding plates 15 together. The sliding plates 15 move together with the second welding wire head 23 on the semi-circular ring plate 16, thereby changing the welding position in the axial direction.

[0053] A welding circuit is connected between the second welding wire tip 23 and the first welding wire tip 13. The second welding wire tip 23 intermittently contacts multiple exposed wires 4 by oscillating.

[0054] The sliding frame assembly also includes a C-shaped rotating plate 17, which rotates on a semi-circular ring plate 16 via an annular groove 27. The annular groove 27 is coaxially arranged with the C-shaped rotating plate 17, and the curvature of the annular groove 27 is the same as that of the semi-circular ring plate 16. Therefore, the C-shaped rotating plate 17 rotates on the semi-circular ring plate 16 via the annular groove 27.

[0055] The arc of the C-shaped rotating plate 17 is greater than that of the annular groove 27. The supplementary welding components are set on the C-shaped rotating plate 17, which ensures that the C-shaped rotating plate 17 is always in contact with the semi-circular ring plate 16 during rotation, thereby ensuring that the C-shaped rotating plate 17 carries the second welding wire head 23 and rotates around the automotive wiring harness 3.

[0056] Reference Figure 8 and Figure 9The sliding frame assembly is equipped with a supplementary welding component to reinforce the exposed wire 4. This supplementary welding component includes a fixing rod 18 and a second welding wire head 23. The fixing rod 18 is vertically fixed to the C-shaped rotating plate 17 and is connected to the second welding wire head 23 via an elastic curved rod 19. An electromagnetic generator 20 is mounted on the elastic curved rod 19. A magnet plate 22 is also mounted on the C-shaped rotating plate 17. A return spring 21 connects the magnet plate 22 to the electromagnetic generator 20. When the electromagnetic generator 20 is turned off, the magnetic attraction of the electromagnetic generator 20 to the magnet plate 22 disappears, causing it to swing under the combined action of the elastic curved rod 19 and the return spring 21. (Refer to...) Figure 9 The oscillation amplitude of the second welding wire tip 23 in this state will change the welding contact point.

[0057] Then the welding circuit is turned on. At this time, the second welding wire tip 23, which was not originally in contact with the multiple exposed wires 4, will come into contact with the exposed wires 4. Therefore, the first welding wire tip 13, the welding post 2, the multiple exposed wires 4 and the second welding wire tip 23 will form a connected circuit, allowing the current of the welding circuit to flow through and complete the welding operation.

[0058] After one welding, the external propulsion device is activated to drive the two sliding frames 7 to move in opposite directions, thereby moving the automotive wiring harness 3, which is secured by two snap-fit ​​half-rings 5, toward the wire insertion detector 14.

[0059] If there are unwelded areas during the welding process, the multiple exposed wires 4 in that area will not be welded to the welding base 1 or to the adjacent exposed wires 4. Therefore, these unfixed exposed wires 4 will move together with the vehicle wiring harness 3. The exposed wires 4 between the welded area and the vehicle wiring harness 3 will bend during the advancement of the vehicle wiring harness 3, thereby ensuring that the multiple unfixed exposed wires 4 will move together with the vehicle wiring harness 3 without obstruction.

[0060] Reference Figure 6 and Figure 7 In the state, a wire insertion detector 14 is provided on the vertical frame 12, which is coaxially arranged with the automotive wiring harness 3. The wire insertion detector 14 includes a sleeve 141. An end plate 142 is provided on the side of the sleeve 141 facing multiple exposed wires 4. A sensor trigger 144 is provided on the side of the end plate 142 opposite to the exposed wires 4, which is coaxially arranged with the socket 143. Multiple sockets 143 are provided on the end plate 142. A sensor assembly is also provided inside the sleeve 141.

[0061] Multiple exposed wires 4, which are not fixed, will move together with the vehicle wiring harness 3 until they are connected to the wire insertion detector 14. That is, multiple exposed wires 4 pass through the end plate 142 through the socket 143 and extend into the sleeve 141, while pushing away the induction trigger 144 that originally blocked the socket 143. The semi-circular plate 16 is symmetrically provided with mounting slots, and each mounting slot is equipped with an electric drive motor 26. The two electric drive motors 26 are connected to the sensor assembly and the induction trigger 144. Therefore, the pushed-away induction trigger 144 will transmit the position electrical signal to the sensor assembly, and then process the electrical signal and transmit it to the electric drive motor 26. The induction trigger 144 transmitting the electrical signal to the sensor assembly and then controlling the movement of the electric drive motor 26 is existing technology and will not be elaborated on here.

[0062] The output end of the electric drive motor 26 is fixed with a meshing gear 25, and a notched gear 24 is provided on the C-shaped rotating plate 17. The notched gear 24 meshes with the two meshing gears 25 to control the number of rotations of the meshing gear 25 at the output end of the electric drive motor 26. Finally, the meshing notched gear 24 and the two meshing gears 25 drive the welding head of the second welding wire head 23 on the C-shaped rotating plate 17 to face the unwelded areas of multiple exposed wires 4 and perform multiple welding operations. This allows the welding process to not only detect the firmness of the welding between the automotive wiring harness 3 and the welding base 1, but also to further weld areas that are not firmly welded, until the electric drive motor 26 can no longer be triggered, which means that the welding is firm and there will be no pull-out phenomenon.

[0063] The working principle of this invention is as follows:

[0064] S1: First, the two sliding frames 7 are snapped and slidably set on the welding base 1. Then, the automotive wiring harness 3 with multiple exposed wires 4 is attached to the welding column 2, with the multiple exposed wires 4 attached to the welding base 1. Then, the two snap-on half-rings 5 ​​are snapped onto the automotive wiring harness 3 and connected to the sliding frames 7 through the swing rod 9. The external propulsion device is activated to drive the two sliding frames 7 to move relative to each other or in opposite directions, thereby driving the automotive wiring harness 3 with multiple exposed wires 4 to reciprocate along the cable direction.

[0065] S2: Then, the fixing bracket 11 is snapped onto the welding base 1, and the wire end is inserted into the detector 14 and set coaxially with the automotive wiring harness 3. The sliding plate 15 moves together with the second welding wire head 23 on the semi-circular ring plate 16 to change the welding position along the axial direction. Then, the first welding wire head 13 on the vertical bracket 12 is attached to the top of the welding column 2 on the welding base 1, and then the welding circuit is turned on.

[0066] S3: Then turn off the electromagnetic generator 20 that was originally turned on. As a result, the magnetic attraction of the electromagnetic generator 20 to the magnet plate 22 disappears. Under the combined action of the elastic crank 19 and the return spring 21, it swings. At this time, the second welding wire head 23, which was not originally in contact with the multiple exposed wires 4, will come into contact with the exposed wires 4. Therefore, the first welding wire head 13, the welding column 2, the multiple exposed wires 4 and the second welding wire head 23 will form a connected circuit, allowing the current of the welding circuit to flow through and complete the welding operation.

[0067] S4: After one welding, the external propulsion device is activated to drive the two sliding frames 7 to move in opposite directions, thereby moving the automotive wiring harness 3, which is held in place by the two snap-fit ​​half-rings 5, toward the wire insertion detector 14. If there are unwelded areas during the welding process, the multiple exposed wires 4 in that area are not welded to the welding base 1 or are not welded to the adjacent exposed wires 4. Therefore, these unfixed multiple exposed wires 4 will move together with the automotive wiring harness 3. The exposed wires 4 between the welded area and the automotive wiring harness 3 bend during the advancement of the automotive wiring harness 3, thereby ensuring that the multiple unfixed exposed wires 4 will move together with the automotive wiring harness 3 without obstruction.

[0068] S5: The multiple exposed wires 4 that are not fixed will move together with the vehicle wiring harness 3 until they are connected to the wire insertion detector 14. That is, the multiple exposed wires 4 pass through the end plate 142 through the socket 143 and extend into the sleeve 141. At the same time, they push away the induction trigger 144 that was originally blocking the socket 143. Therefore, the pushed-away induction trigger 144 will transmit the position electrical signal to the sensor assembly, and then process the electrical signal and transmit it to the electric drive motor 26. Finally, it controls the number of rotations of the meshing gear 25 at the output end of the electric drive motor 26. Finally, through the meshing notched gear 24 and the two meshing gears 25, the welding head of the second welding wire head 23 on the C-shaped rotating plate 17 is driven towards the area where the multiple exposed wires 4 have not been welded, and multiple weldings are performed.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for detecting the pull-out force of automotive wiring harness terminals, comprising a welding base (1) and an automotive wiring harness (3) lapped on the welding base (1), characterized in that, The outer sheath of the car wiring harness (3) is removed to expose multiple exposed wires (4). There are welding posts (2) on the welding base (1). The multiple exposed wires (4) overlap the welding posts (2) on the welding base (1). There are two sliding frames (7) that slide symmetrically on the welding base (1). There is a snap-fit ​​assembly between the sliding frames (7) and the car wiring harness (3). A fixing frame (11) is fixedly attached to the welding base (1). The fixing frame (11) has a vertical frame (12). A wire insertion detector (14) coaxially arranged with the automotive wiring harness (3) is provided on the vertical frame (12). A first welding wire head (13) connected to the top of the welding column (2) is provided on the vertical frame (12). A sliding frame (7) assembly is provided on the fixing frame (11). A supplementary welding assembly for reinforcing the exposed wire (4) is provided on the sliding frame (7) assembly. The wire insertion detector (14) includes: A sleeve (141) is provided with an end plate (142) on the side facing multiple exposed wires (4), and multiple insertion holes (143) are provided on the end plate (142). A sensor assembly is also provided inside the sleeve (141). An induction trigger (144) is provided on the side opposite to the exposed line (4) of the end plate (142) and is coaxially arranged with the socket (143). The sliding frame (7) assembly includes: Two sliding plates (15) are symmetrically arranged on the fixed frame (11), and the two sliding plates (15) are provided with the same semi-circular ring plate (16) on the side facing the snap-fit ​​semi-ring (5). C-shaped rotating plate (17) rotates on semi-circular ring plate (16) through annular groove (27); Additional welding components include: The fixing rod (18) and the second welding wire head (23) are vertically fixed on the C-shaped rotating plate (17) and the fixing rod (18) is connected to the second welding wire head (23) through the elastic curved rod (19). An electromagnetic generator (20) is mounted on an elastic crank (19). A magnet plate (22) is also mounted on a C-shaped rotating plate (17). A return spring (21) is connected between the magnet plate (22) and the electromagnetic generator (20). A mounting groove is symmetrically mounted on a semi-circular ring plate (16), and an electric drive motor (26) is mounted in each mounting groove. A meshing gear (25) is fixed at the output end of the electric drive motor (26). A notched gear (24) is mounted on the C-shaped rotating plate (17). The notched gear (24) meshes with two meshing gears (25). A welding circuit is connected between the second welding wire head (23) and the first welding wire head (13). The second welding wire head (23) contacts multiple exposed wires (4) through intermittent swinging.

2. The automotive wiring harness terminal pull-out force testing device according to claim 1, characterized in that, The snap-fit ​​assembly includes: Two snap-fit ​​half rings (5) are fastened to each other on the outer wall of the car wiring harness (3), and the two snap-fit ​​half rings (5) are connected by threads through a threaded bolt (6), and the two snap-fit ​​half rings (5) are pressed against the outer wall of the car wiring harness (3). The swing rod (9) has end sleeves (10) at both ends. A fixed post (8) is fixed on the sliding frame (7). The end sleeves (10) at both ends of the swing rod (9) are respectively fitted onto the fixed post (8) and the threaded bolt (6).

3. The automotive wiring harness terminal pull-out force testing device according to claim 2, characterized in that, The sliding plate (15) is slidably connected to the fixed frame (11) through the sliding block assembly; The annular groove (27) is coaxially arranged with the C-shaped rotating plate (17), and the arc of the annular groove (27) is the same as the arc of the semi-circular annular plate (16).

4. The automotive wiring harness terminal pull-out force testing device according to claim 3, characterized in that, The arc of the C-shaped rotating plate (17) is greater than the arc of the annular groove (27), and the supplementary welding assembly is set on the C-shaped rotating plate (17).

5. The automotive wiring harness terminal pull-out force testing device according to claim 4, characterized in that, Two electrically controlled drive motors (26) are connected to the sensor assembly and the induction trigger (144).

6. A method for detecting the pull-out force of automotive wiring harness terminals, applied to the automotive wiring harness terminal pull-out force detection device as described in claim 5, characterized in that, The specific method is as follows: S1: First, the two sliding frames (7) are snapped and slidably set on the welding base (1). Then, the automotive wiring harness (3) with multiple exposed wires (4) is attached to the welding column (2), with the multiple exposed wires (4) attached to the welding base (1). Then, the two snap-on half rings (5) are snapped onto the automotive wiring harness (3) and connected to the sliding frame (7) through the swing rod (9). The external propulsion device is turned on to drive the two sliding frames (7) to move relative to each other or in opposite directions, thereby driving the automotive wiring harness (3) with multiple exposed wires (4) to move back and forth along the cable direction. S2: Then the fixing bracket (11) is snapped onto the welding base (1), and the wire end is inserted into the detector (14) and set coaxially with the car wiring harness (3). The sliding plate (15) moves together with the second welding wire end (23) on the semi-circular ring plate (16) to change the welding position along the axial direction. Then the first welding wire end (13) on the vertical frame (12) is attached to the top of the welding column (2) on the welding base (1), and then the welding circuit is turned on. S3: Then turn off the electromagnetic generator (20) that was originally turned on. As a result, the magnetic attraction of the electromagnetic generator (20) to the magnet plate (22) disappears. Under the combined action of the elastic crank (19) and the return spring (21), it swings. At this time, the second welding wire head (23) that was not originally in contact with the multiple exposed wires (4) will come into contact with the exposed wires (4). Therefore, the first welding wire head (13), the welding column (2), the multiple exposed wires (4) and the second welding wire head (23) will form a connected circuit, allowing the current of the welding circuit to flow through and complete the welding operation. S4: After welding once, the external propulsion device is activated to drive the two sliding frames (7) to move in opposite directions, and then the car wiring harness (3) which is clipped by the two clipping half rings (5) moves toward the wire insertion detector (14). If there is an unwelded area during the welding process, the multiple exposed wires (4) in that area are not welded to the welding base (1) or are not welded to the adjacent exposed wires (4). Therefore, the multiple exposed wires (4) that are not fixed will move together with the car wiring harness (3). The exposed wires (4) between the welded area and the car wiring harness (3) bend during the advancement of the car wiring harness (3), thereby ensuring that the multiple exposed wires (4) that are not fixed will move together with the car wiring harness (3) without obstruction. S5: The multiple exposed wires (4) that are not fixed will move together with the car wiring harness (3) until they are connected to the wire insertion detector (14). That is, the multiple exposed wires (4) pass through the end plate (142) through the socket (143) and extend into the sleeve (141), while pushing away the induction trigger (144) that originally blocked the socket (143). Therefore, the induction trigger (144) that is pushed away will transmit the position electrical signal to the sensor assembly, and then process the electrical signal and transmit it to the electric drive motor (26), and finally control the number of rotations of the meshing gear (25) at the output end of the electric drive motor (26). Finally, through the meshing notched gear (24) and the two meshing gears (25), the welding head of the second welding wire head (23) on the C-shaped rotating plate (17) is driven to face the area where the multiple exposed wires (4) have not been welded, and perform multiple welding.

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