A terminal crimping device for automotive wiring harness

Abstract

The application relates to the technical field of terminal crimping, in particular to a terminal crimping device for automobile wire harnesses. The device comprises a base, a pretreatment mechanism arranged on the base, an electric sliding block slidably connected to the base, a positioning gripper fixed to the electric sliding block, a vertical connecting plate fixed to the base through a support plate, an inclined rod A fixed to the vertical connecting plate, an inclined rod B hinged to the inclined rod A, a torsional spring arranged between the inclined rod A and the inclined rod B, and a door-shaped support fixed to the base. Through the design of the pretreatment mechanism, the inclined rod B and the inclined rod A are used to successively extrude a follow-up guide shaft before high-voltage wire harnesses and terminals are crimped, so that two flat pressing clamping rods can pre-press scattered copper wires into regular flat shapes, the reliability and uniformity of a subsequent copper wire gathering mechanism in embracing and gathering the copper wires are effectively ensured, and the generation conditions of copper wire burrs are eliminated from the source.

Description

Technical Field

[0001] This invention relates to the field of terminal crimping technology, and more particularly to a crimping device for automotive wiring harness terminals. Background Technology

[0002] In the production process of high-voltage wiring harnesses for new energy vehicles, the quality of terminal crimping is directly related to the high-voltage safety and conductivity stability of the entire vehicle. Currently, the pre-processing of large-square-meter cable terminals relies on manual sorting of the scattered copper wires and manual placement into the crimping mold. However, due to the large number of copper wires and poor flexibility of large-square-meter cables, manual operation can easily cause burrs, broken wires, or terminal position displacement during crimping.

[0003] Existing automated equipment typically lacks the function of pre-flattening and gathering copper wires, or it simply relies on clamping to forcibly close them at the moment of crimping. Due to the lack of pre-flattening treatment and the lack of timing coordination between the gathering action and the feeding action, the copper wires are still in a loose or flat state before entering the terminal cavity. This causes the copper wires to easily burr, be exposed, or bend at the terminal opening during crimping, thereby affecting the conductive contact area and connection reliability. Summary of the Invention

[0004] This invention addresses the problem of burrs and bends easily generated in copper wires during the existing high-voltage wiring harness terminal crimping process, and provides a crimping device for automotive wiring harness terminals.

[0005] The technical solution is: a crimping device for automotive wiring harness terminals, including a base, wherein a pre-processing mechanism is provided on the base; The pretreatment mechanism includes an electric slider that is slidably mounted on the base, a positioning clamp is fixedly installed on the electric slider, and the electric slider is symmetrically connected to a vertical connecting plate through a support plate. A diagonal rod A is fixedly installed on the vertical connecting plate, and a diagonal rod B is hinged to the end of the diagonal rod A. A torsion spring is assembled between the diagonal rod A and the diagonal rod B. A portal frame is fixedly installed on the base. Flat pressure clamps are symmetrically slidably connected inside the portal frame. Compression springs A are symmetrically assembled between the two flat pressure clamps. Follower guide shafts are symmetrically fixedly connected to both ends of each flat pressure clamp. The base is also equipped with a gathering mechanism, which is linked with the preprocessing mechanism in a sequential action.

[0006] Furthermore, the gathering mechanism includes transverse support arms symmetrically arranged above the base, and gathering clamps fixedly connected to the ends of the transverse support arms. The two lateral arms are configured to move toward each other, causing the converging clamps to close in an encircling shape to wrap around the copper wires of the cable after they have been processed by the flat clamp rod.

[0007] Furthermore, the gathering mechanism also includes a guide frame fixedly installed on the base, a follower slide is embedded in and slidably connected to the guide frame, and a load-bearing slider is symmetrically slidably connected to the follower slide; The transverse support arm is slidably connected to the load-bearing slider, and a tension spring is fitted between the transverse support arm and the load-bearing slider; A compression spring B is fitted between the load-bearing slider and the follower slide.

[0008] Furthermore, a linkage rod is fixedly connected to the electric slider, and a transmission gear is rotatably mounted at the end of the linkage rod; An upper rack is fixedly mounted on the follower slide, and a lower rack is fixedly mounted on the base. The transmission gear is engaged with the upper rack and the lower rack respectively. When the electric slider moves, the transmission gear rolls on the lower rack and drives the follower slide to move through the upper rack. The moving speed of the follower slide is greater than the moving speed of the electric slider.

[0009] Furthermore, guide rails are symmetrically fixedly connected to the base; The bottom of the bearing slider is provided with a circular groove, a guide rod is slidably connected in the circular groove, and a compression spring C is assembled between the guide rod and the circular groove; The bottom end of the guide rod extends into and is confined within the guide rail.

[0010] Furthermore, a guide wedge A is fixedly installed inside the guide rail; When the guide rod travels along the guide track, it forms a pressing fit with the inclined surface of the guide wedge A, so as to force the bearing sliders on both sides to move towards each other, and force the converging clamps on both sides to abut against each other to form a closed loop.

[0011] Furthermore, a limiting rod is hinged to the bearing slider, and a torsion spring is assembled between the limiting rod and the bearing slider; A locking protrusion is fixedly installed on the transverse support arm, and the locking protrusion and the limiting rod form a one-way blocking engagement.

[0012] Furthermore, a fixed support rod is fixedly connected to one side of the portal frame, and a pressure block is fixedly provided at the end of the fixed support rod. The inclined surface of the pressure block forms a pushing engagement with the limiting rod, which is used to force the limiting rod to deflect at a predetermined stroke position to release the blocking protrusion.

[0013] Furthermore, a guide wedge B is fixedly installed on one side of the guide wedge A within the guide rail. The guide wedge B connects with the guide wedge A to form a guide surface, and the guide surface slides into the guide rod.

[0014] Furthermore, a reset stop bar is symmetrically fixedly connected to the other side of the portal bracket, and an abutment protrusion is fixedly provided on the transverse support arm to form a rigid abutment with the reset stop bar. The reset stop bar is used to force the transverse support arm back to the initial locked position when the electric slider is reset.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention, through the design of the pretreatment mechanism, uses inclined rods B and A to squeeze the follower guide shaft in succession before crimping the high-voltage wire harness and the terminal, so that the two flat pressure clamps pre-press the scattered copper wires into a regular flat shape, effectively ensuring the reliability and uniformity of the subsequent gathering mechanism to hug and gather the copper wires, and eliminating the conditions for the generation of copper wire burrs from the source.

[0016] 2. By setting transmission gears, upper racks and lower racks, the present invention enables the follower slide to obtain a movement speed greater than that of the electric slider. During the high-speed follow-up process, the two converging clamps can not only quickly close, but also take advantage of the speed to move synchronously to the end of the copper wire when the front end of the copper wire enters the inner cavity of the terminal, so that the surface of the copper wire in the entire exposed section remains in a smooth and closed state, completely preventing the copper wire from bending or being exposed outside the terminal.

[0017] 3. This invention achieves rigid locking of the converging clamps during the closing and advancing process through the one-way blocking cooperation of the limiting lever and the blocking protrusion, ensuring the stability of the converging state. At the same time, the pressure block forcibly unlocks at a predetermined stroke position, allowing the converging clamps to retract in time before pressing, avoiding interference with the pressing components. In addition, the rigid abutting cooperation between the reset stop and the abutting protrusion can forcibly push the transverse support arm back to the initial locking position when the electric slider resets, realizing fully automated cyclic reset without manual intervention, significantly improving the production efficiency of continuous operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the pretreatment mechanism in this invention; Figure 3 This is a schematic diagram of the gathering mechanism in this invention; Figure 4 This is a schematic diagram of the installation of the guide frame in this invention; Figure 5 This is a schematic diagram of the installation of the upper rack in this invention; Figure 6 This is a schematic diagram of the installation of the transmission gear in this invention; Figure 7 This is a schematic diagram of the installation at the guide rod in this invention; Figure 8 This is a schematic diagram of the installation of the limiting lever in this invention; Figure 9 This is a schematic diagram of the installation of the pressure block in this invention; Figure 10 This is a schematic diagram of the installation of the guide wedge at point B in this invention; Figure 11 This is a schematic diagram of the installation of the reset stop in this invention.

[0019] Component names and serial numbers in the diagram: 1_Base, 201_Electric slider, 202_Positioning clamp, 203_Vertical connecting plate, 204_Diagonal bar A, 205_Diagonal bar B, 206_Gantry bracket, 207_Flat pressure clamp, 208_Follower guide shaft, 301_Transverse support arm, 302_Gathering clamp, 401_Guide frame, 402_Follower slide, 403_Bearing slider, 501_ Linkage support rod, 502_transmission gear, 503_upper rack, 504_lower rack, 601_guide rail, 602_guide rod, 701_guide wedge A, 801_limiting lever, 802_blocking protrusion, 901_fixed support rod, 902_pressure block, 1001_guide wedge B, 1101_reset lever, 1102_abutting convex shaft, 100_pressing assembly, 200_terminal. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 and Figure 2As shown, a crimping device for automotive wiring harness terminals includes a base 1. A pre-processing mechanism is provided on the base 1. The pre-processing mechanism includes an electric slider 201 slidably connected to the base 1 in a left-right direction. A positioning clamp 202 for fixing a high-voltage wiring harness is installed on the upper part of the electric slider 201. Vertical connecting plates 203 are symmetrically fixed to the front and rear sides of the electric slider 201 via support plates. Diagonal rods A204 are fixedly provided on adjacent sides of the two vertical connecting plates 203, and diagonal rods B205 are hinged to the ends of diagonal rods A204 and B205. A torsion spring is assembled between diagonal rods A204 and B205. A portal frame is fixedly installed on the base 1. The frame 206 has two opposing flat pressure clamps 207 slidably connected inside the gantry bracket 206. Compression springs A are symmetrically assembled between the two flat pressure clamps 207. Each flat pressure clamp 207 has a follower guide shaft 208 fixedly connected to both ends. When the follower guide shaft 208 is pushed by the inclined rods A204 and B205 in turn, it can drive the two flat pressure clamps 207 to squeeze the copper wires of the high-voltage wire harness, so that the copper wires reach a flat and dense state before being gathered by the subsequent mechanism. The base 1 is also equipped with a gathering mechanism that forms a time-linked action with the pre-processing mechanism, and a crimping assembly 100 is installed in the corresponding position.

[0022] like Figure 3 As shown, the gathering mechanism includes a transverse support arm 301 symmetrically arranged above the base 1 and a gathering clamping petal 302 fixed to the end of the transverse support arm 301. When the two transverse support arms 301 move towards each other, they can drive the two gathering clamping petals 302 to abut against each other, forming a ring-shaped wrap around the copper wire treated by the flat pressure clamping rod 207, thereby effectively preventing the copper wire from being exposed before entering the terminal. The outer diameter of the ring formed after the two gathering clamping petals 302 abut against each other is smaller than the inner diameter of the terminal 200.

[0023] like Figure 4 and Figure 5 As shown, the gathering mechanism also includes a guide frame 401 fixedly connected to the base 1. A follower slide 402 is embedded and slidably connected inside the guide frame 401 in the left-right direction. A load-bearing slider 403 is symmetrically slidably connected inside the follower slide 402. A transverse support arm 301 is slidably connected to the load-bearing slider 403. A tension spring is installed between the transverse support arm 301 and the load-bearing slider 403. The tension spring is used to provide the retraction driving force of the transverse support arm 301 after the limit is released. Compression springs B are installed between the two load-bearing sliders 403 and the follower slide 402.

[0024] like Figures 4 to 6As shown, a linkage rod 501 is fixedly connected to the right side of the electric slider 201. A transmission gear 502 is rotatably mounted on the right end of the linkage rod 501. An upper rack 503 is fixedly installed on the lower part of the follower slide 402, and a lower rack 504 is fixedly installed on the base 1. The transmission gear 502 maintains meshing with the upper rack 503 and the lower rack 504 respectively. When the electric slider 201 slides to the right, the transmission gear 502 rolls between the upper rack 503 and the lower rack 504, which can drive the follower slide 402 to obtain a moving speed greater than that of the electric slider 201, so that the two converging clamps 302 have completed closing before passing through the portal bracket 206.

[0025] like Figure 4 and Figure 7 As shown, to ensure the motion accuracy of the gathering mechanism, a guide rail 601 is symmetrically fixedly connected to the top of the base 1. A circular groove is opened at the bottom of the bearing slider 403. A guide rod 602 is slidably connected in the circular groove through a compression spring C. The compression spring C always keeps pushing the guide rod 602 downward, so that the bottom end of the guide rod 602 always extends into and is confined within the guide rail 601.

[0026] like Figure 7 and Figure 10 As shown, a guide wedge A701 is fixedly installed inside the guide rail 601 near the left end. When the guide rod 602 slides along the guide rail 601 to the guide wedge A701, under the forced guidance of the inclined surface of the guide wedge A701, the guide rod 602 slides obliquely along the rail, thereby driving the two bearing sliders 403 to move closer to each other, forcing the converging clamps 302 to fit tightly together to form a complete annular closed structure.

[0027] The dynamic working process of this embodiment will be described in detail below.

[0028] Initially, the two converging clamping petals 302 are far apart from each other, and the two guide rods 602 are in contact with the inclined surfaces of the two guide wedges A701 respectively. The operator first places the high-voltage wire harness with part of the insulation stripped into the positioning clamp 202, so that the copper wire passes between the two flat clamping rods 207, and puts the terminal 200 into the mold cavity of the crimping assembly 100, and controls the positioning clamp 202 to close and clamp the high-voltage wire harness.

[0029] Then, the electric slider 201 is activated, sliding to the right along the base 1. Through the support plate, it drives the vertical connecting plate 203, the inclined rod A 204, and the inclined rod B 205 to move to the right simultaneously. In the initial stage of the movement, the four inclined rods B 205 contact and squeeze the corresponding follower guide shafts 208, pushing the two flat pressure clamps 207 to slide against each other against the elastic force of the compression spring A. This slightly flattens the copper wire from the top and bottom. At the same time, the compression spring A contracts and stores energy, and the electric slider 201 continues to move forward. After the inclined rod B 205 passes the follower guide shaft 208, the inclined rod A 204 takes over contact with the follower guide shaft 208 and continues to apply pressure, thus keeping the copper wire in a flat state before the subsequent action is connected.

[0030] Meanwhile, the electric slider 201 drives the transmission gear 502 to move via the linkage rod 501; the transmission gear 502 rotates under the drive of the lower rack 504, and drives the follower slide 402 to slide to the right along the guide frame 401 via the upper rack 503. Due to the transmission ratio configuration, the follower slide 402 obtains a movement speed faster than the electric slider 201, thus moving quickly to the right and driving the two load-bearing sliders 403 to follow synchronously. The load-bearing sliders 403 then push the transverse support arm 301, the converging clamp 302, and the guide rod 602 to move together. When the guide rod 602 travels to the inclined surface of the guide wedge A701, the inclined surface is forcibly changed. The trajectory of guide rod 602 is changed, causing the two guide rods 602 to move towards each other along guide rail 601. The bearing slider 403 slides inward under the action of compression spring B, causing the gathering clamping petals 302 to gradually close. Due to the accumulation of speed difference, the two gathering clamping petals 302 have already closed before the inclined rod A204 leaves the follower guide shaft 208, forming a closed ring that wraps the flattened copper wire inside, effectively preventing the copper wire from escaping upward or downward and causing flash. After that, the inclined rod A204 completely passes the follower guide shaft 208, the compression spring A releases energy, and the flattening clamping rod 207 resets. The pre-flattening and initial gathering of the copper wire are thus completed.

[0031] After closing, the gathering clamp 302 continues to move to the right along with the high-speed movement of the follower slide 402, passing through the portal bracket 206 and the flat clamp 207, and re-gathers the originally flat copper wire into a column shape and precisely sends it into the interior of the terminal 200. When the front end of the copper wire reaches the inner cavity of the terminal 200, the right end of the gathering clamp 302 also enters the opening of the terminal 200, thus eliminating the possibility of the copper wire bending or being exposed outside the terminal 200. At this time, the guide rod 602 has moved to the corner of the guide rail 601, and the two bearing sliders 403 lose lateral restraint at the same time. The compression spring B releases energy and pushes the bearing slider 403 to spring outward along the follower slide 402. Through the transverse support arm 301, the gathering clamp 302 releases the copper wire and adheres to the inner wall of the terminal 200, so that the copper wire remains free inside the terminal 200.

[0032] like Figures 7 to 9As shown, a limiting rod 801 is hinged to the bearing slider 403, and a torsion spring is assembled between the limiting rod 801 and the bearing slider 403. A locking protrusion 802 is fixedly installed on the top of the transverse support arm 301. In the initial state, the limiting rod 801 locks the locking protrusion 802 under the action of the torsion spring, thereby mechanically locking the transverse support arm 301. A fixed support rod 901 is fixedly connected to the right side of the portal bracket 206, and a pressure block 902 with an inclined surface is fixedly installed at the end of the fixed support rod 901. When the bearing slider 403 moves to the corresponding position, the limiting rod... When the inclined surface of the pressure block 902 contacts the pressure block 902, the pressure block 902 forces the limiting lever 801 to overcome the rotation of the torsion spring, causing it to disengage from the blocking protrusion 802, thereby releasing the rigid lock on the transverse support arm 301. The tension spring then contracts, pulling the transverse support arm 301 and the gathering clamp 302 to quickly retract to the left and exit the terminal 200. Since the gathering clamp 302 has loosened the copper wire before retraction, it will not cause friction and pulling on the copper wire, thus ensuring the stability of the copper wire's posture within the terminal 200. Subsequently, the crimping assembly 100 presses down to complete the final crimping forming of the terminal 200.

[0033] After the pressing is completed, the electric slider 201 slides to the left to reset. During the reset process, the electric slider 201 drives the transmission gear 502 to reverse through the linkage support rod 501, and drives the follower slide 402 to move quickly to the left through the lower rack 504 and the upper rack 503. At the same time, the bearing slider 403, the transverse support arm 301 and the converging clamp 302 also move to the left. The limit lever 801 moves to the left with the bearing slider 403, and after disengaging from the pressure block 902, it returns to its initial position under the action of its own torsion spring.

[0034] like Figure 10 and Figure 11 As shown, a guide wedge B1001 is fixedly installed on one side of the guide wedge A701 within the guide rail 601. The guide wedge B1001 connects with the guide wedge A701 to form a guide surface. A reset stop 1101 is symmetrically fixedly connected to the other side of the portal bracket 206. A contacting convex shaft 1102 that mates with the reset stop 1101 is fixedly installed on the top of the transverse support arm 301. When the contacting convex shaft 1102 on the transverse support arm 301 contacts the reset stop 1101, the reset stop 1101... By forcibly pushing the transverse support arm 301 to slide to the right along the bearing slider 403 by the abutting cam 1102, the tension spring is stretched. The transverse support arm 301 drives the locking protrusion 802 to gradually approach the limiting lever 801. The locking protrusion 802 squeezes the limiting lever 801 so that it overcomes the deflection of the torsion spring again until the transverse support arm 301 is completely reset. The locking protrusion 802 passes the limiting lever 801. The limiting lever 801 rebounds under the action of the torsion spring and re-locks the locking protrusion 802, restoring the rigid locking of the transverse support arm 301.

[0035] Meanwhile, the bearing slider 403 drives the guide rod 602 to slide to the left within the guide rail 601. When the guide rod 602 reaches the guide wedge B1001, it is forced to lift upwards by the inclined surface, and the compression spring C stores energy. After passing the guide wedge B1001, the guide rod 602 moves smoothly along the top of the guide wedge A701 until it passes the guide wedge A701. The compression spring C releases energy and presses the guide rod 602 into the root of the inclined surface of the guide wedge A701, restoring the fit. The control positioning clamp 202 releases the high-voltage wire harness. At this point, all components return to their initial positions, and the operator can remove the crimped high-voltage wire harness to proceed with the next round of work.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A crimping device for automotive wiring harness terminals, comprising a base (1), characterized in that: The base (1) is equipped with a pretreatment mechanism; The pretreatment mechanism includes an electric slider (201) that is slidably mounted on the base (1). A positioning clamp (202) is fixedly installed on the electric slider (201), and a vertical connecting plate (203) is symmetrically fixedly connected to the electric slider (201) through a support plate. A diagonal rod A (204) is fixedly installed on the vertical connecting plate (203). A diagonal rod B (205) is hinged to the end of the diagonal rod A (204), and a torsion spring is assembled between the diagonal rod A (204) and the diagonal rod B (205). A portal frame (206) is fixedly installed on the base (1). A flat pressure clamp (207) is symmetrically slidably connected inside the portal frame (206). A compression spring A is symmetrically assembled between the two flat pressure clamps (207). A follower guide shaft (208) is symmetrically fixedly connected to both ends of each flat pressure clamp (207). The base (1) is also provided with a gathering mechanism, which is linked with the preprocessing mechanism in a sequential action.

2. The crimping device for automotive wiring harness terminals according to claim 1, characterized in that: The gathering mechanism includes a transverse support arm (301) symmetrically arranged above the base (1), and a gathering clamp (302) fixedly connected to the end of the transverse support arm (301). The two lateral arms (301) are configured to move toward each other and cause the converging clamps (302) to converge in an encircling shape to wrap around the copper wires of the cable after they have been processed by the flat clamps (207).

3. The crimping device for automotive wiring harness terminals according to claim 2, characterized in that: The gathering mechanism also includes a guide frame (401) fixedly installed on the base (1), a follower slide (402) is embedded in and slidably connected to the guide frame (401), and a load-bearing slider (403) is symmetrically slidably connected to the follower slide (402). The transverse support arm (301) is slidably connected to the bearing slider (403), and a tension spring is fitted between the transverse support arm (301) and the bearing slider (403); A compression spring B is fitted between the load-bearing slider (403) and the follower slide (402).

4. The crimping device for automotive wiring harness terminals according to claim 3, characterized in that: A linkage rod (501) is fixedly connected to the electric slider (201), and a transmission gear (502) is rotatably installed at the end of the linkage rod (501). An upper rack (503) is fixedly installed on the follower slide (402), and a lower rack (504) is fixedly installed on the base (1). The transmission gear (502) maintains meshing with the upper rack (503) and the lower rack (504) respectively. When the electric slider (201) moves, the transmission gear (502) rolls on the lower rack (504) and drives the follower slide (402) to move through the upper rack (503). The moving speed of the follower slide (402) is greater than the moving speed of the electric slider (201).

5. The crimping device for automotive wiring harness terminals according to claim 4, characterized in that: Guide rails (601) are symmetrically fixedly connected to the base (1). The bottom of the bearing slider (403) is provided with a circular groove, and a guide rod (602) is slidably connected in the circular groove. A compression spring C is assembled between the guide rod (602) and the circular groove. The bottom end of the guide rod (602) extends into and is confined within the guide rail (601).

6. The crimping device for automotive wiring harness terminals according to claim 5, characterized in that: A guide wedge A (701) is fixedly installed inside the guide rail (601). When the guide rod (602) travels along the guide rail (601), it forms a pressing fit with the inclined surface of the guide wedge block A (701) to force the bearing sliders (403) on both sides to move closer together, forcing the gathering clips (302) on both sides to abut against each other to form a closed loop.

7. The crimping device for automotive wiring harness terminals according to claim 6, characterized in that: A limiting rod (801) is hinged to the bearing slider (403), and a torsion spring is assembled between the limiting rod (801) and the bearing slider (403); A locking protrusion (802) is fixedly provided on the transverse support arm (301), and the locking protrusion (802) and the limiting rod (801) form a one-way blocking cooperation.

8. The crimping device for automotive wiring harness terminals according to claim 7, characterized in that: A fixed support rod (901) is fixedly connected to one side of the portal bracket (206). A pressure block (902) is fixedly provided at the end of the fixed support rod (901). The inclined surface of the pressure block (902) forms a pushing engagement with the limiting rod (801) to force the limiting rod (801) to deflect at a predetermined stroke position to release the blocking protrusion (802).

9. A crimping device for automotive wiring harness terminals according to claim 6, characterized in that: A guide wedge B (1001) is fixedly installed inside the guide rail (601) on one side of the guide wedge A (701). The guide wedge B (1001) is connected to the guide wedge A (701) to form a guide surface. The guide surface is in sliding fit with the guide rod (602).

10. A crimping device for automotive wiring harness terminals according to claim 9, characterized in that: A reset stop bar (1101) is symmetrically fixedly connected to the other side of the portal bracket (206). An abutment convex shaft (1102) is fixedly provided on the transverse support arm (301) to form a rigid abutment with the reset stop bar (1101). The reset stop bar (1101) is used to force the transverse support arm (301) back to the initial locking position when the electric slider (201) is reset.

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