Automobile wire harness static load distribution test frame and test method thereof

Abstract

The invention discloses an automobile wire harness static load distribution test frame and a test method thereof, and relates to the technical field of tension detection equipment, the automobile wire harness static load distribution test frame comprises a workbench and a loading device, the surface of the workbench is rotatably connected with a terminal chuck, and the terminal chuck is provided with a support assembly; according to the supporting assembly in the device, a first rotary knob is rotated to drive a first wedge-shaped block to horizontally move, a second wedge-shaped block drives a supporting disc to vertically move, the terminal is actively supported, the terminal is observed in cooperation with a transparent window, and therefore the terminal is kept in a horizontal state before testing and in the testing process, alignment of the terminal and the tension axis is ensured, and the testing efficiency is improved. The device can adapt to terminals of different sizes and weights, and solves the problem that in the prior art, the terminal is too heavy to cause rotation of the terminal, so that the terminal part of the new material automobile wire harness is supported to ensure that the tension can be loaded along the axis direction of the terminal in the tension test process, and the tension test efficiency is improved. Therefore, stable pulling force is applied.

Description

Technical Field

[0001] This invention relates to the field of tensile testing equipment technology, and more specifically, to a static load distribution test frame for automotive wiring harnesses and its testing method. Background Technology

[0002] New material automotive wiring harnesses, consisting of terminals and wires, refer to wiring harnesses that use innovative materials to adapt to the development trends of electrification, intelligence, and lightweighting in the automotive industry, based on traditional automotive wiring harnesses. The automotive wiring harness static load distribution test frame is a tensile testing device used to test new material automotive wiring harnesses. The device consists of a terminal chuck, a tensile loading device, and a clamp. Existing terminal chucks have multiple U-shaped holes of different radii to hold terminals and wires of different radii. However, there is a situation where the radius of a wire for a certain terminal is between two U-shaped holes with different wall sizes. If the U-shaped hole with the smaller wall size is selected, the groove wall will squeeze the wire. If the U-shaped hole with the larger wall size is selected, there will be a significant gap between the wire and the groove wall. When testing, the wire will shift and wobble because it is not properly fixed, making it impossible to center the tension. In addition, two situations may occur when the terminal is inserted into the U-shaped hole: The first scenario is that the conductor is too heavy: the conductor forms a "cantilever beam", which generates a continuous bending moment on the terminal, causing the terminal to be pried. Manually, the conductor is straightened in advance so that it is clamped while it is straightened. However, this method applies an unknown tension, which causes the test results to be superimposed with the unknown pre-tension force, resulting in deviation. The second scenario is that the terminal is too heavy: After the terminal is placed in the U-shaped hole, it rotates around the edge of the slot due to its own weight. When tensile force is applied, the tensile force is not along the terminal axis, but at an angle to the axis. This will generate bending stress inside the terminal, causing the terminal to break prematurely at its weakest point, thus failing to accurately reflect the strength of the axial connection between the terminal and the wire.

[0003] To address the aforementioned issues, the inventors proposed a static load distribution test fixture for automotive wiring harnesses and its testing method. Summary of the Invention

[0004] To solve the above-mentioned technical problems, a solution is provided that addresses the issues raised in the background section. To achieve the above objectives, the present invention can be implemented using the following technical solutions: This invention provides a static load distribution test frame for automotive wiring harnesses, including a workbench and a loading device. The loading device is slidably connected to the workbench, and a clamping device is slidably connected to the loading device. A terminal chuck is rotatably connected to the surface of the workbench. The terminal chuck has a plurality of U-shaped holes arranged in a ring on it. The wall size of each U-shaped hole is different, and the bottom surface of the inner wall of each U-shaped hole is located in the same plane, that is, the height is consistent. The terminal chuck is provided with a support assembly, which is a support plate that can be raised and lowered inside the terminal chuck; The workbench is provided with a limiting component, which includes a base and a fixing frame. The base is fixedly connected to the workbench, and the fixing frame is fixedly connected to the base. A fixing frame is inserted into the fixing frame, and multiple support wheels are equidistantly rotatably connected within the fixing frame.

[0005] Preferably, the support assembly includes a rectangular cavity, which is opened inside the terminal chuck. A threaded rod is rotatably connected inside the rectangular cavity. A wedge block one and a wedge block two are slidably connected inside the rectangular cavity. Two T-shaped guide rails are symmetrically fixedly connected to the wedge block one, and two T-shaped guide grooves are symmetrically opened on the wedge block two. An annular groove is opened on the surface of the terminal chuck, and multiple circular holes are equidistantly opened on the surface of the annular groove. A support plate is slidably connected inside the annular groove. Multiple connecting posts are equidistantly fixedly connected to the bottom of the support plate. Each T-shaped guide rail is slidably adapted to the adjacent T-shaped guide groove. Multiple transparent windows are equidistantly arranged on the outer wall of the terminal chuck, and the multiple transparent windows are all rectangular.

[0006] Preferably, the wedge block is threadedly connected to the threaded rod, and a knob is rotatably connected to the outer ring surface of the terminal chuck. The knob is interference-fitted with the terminal chuck and fixedly connected to the threaded rod.

[0007] Preferably, one of the circular holes is connected to the rectangular cavity, and one of the connecting posts is fixedly connected to the wedge block, with each connecting post slidingly adapted to the adjacent circular hole.

[0008] Preferably, the limiting component includes two slide rods symmetrically arranged. Both slide rods are fixedly connected to the base. A movable seat is slidably connected to both slide rods. Two movable seats are symmetrically arranged. Two cylindrical tubes are symmetrically inserted into the surface of each movable seat. A contact wheel is rotatably connected to the outer ring surface of each cylindrical tube.

[0009] Preferably, the limiting component includes a bidirectional lead screw, which is rotatably connected to the base and threadedly connected to two movable seats.

[0010] Preferably, a second knob is rotatably connected to the outer wall of the base, the second knob is interference-fitted with the base, and the second knob is fixedly connected to a bidirectional lead screw.

[0011] Preferably, each of the contact wheels and each of the support wheels is made of cast nylon.

[0012] Preferably, a testing method for a test fixture is proposed, comprising the following steps: Step 1, Wire Harness Clamping and Adjustment: Place the wire harness to be tested into the U-shaped hole, ensuring that the terminal portion of the wire harness is inside the terminal chuck and the wire portion is inside the U-shaped hole, extending a certain distance towards the loading device. Through the support component and the limiting component, the wire harness to be tested is kept horizontal. Then, use the clamping device to fix the wire extension portion. Step 2, Tensile Test and Data Acquisition: Start the loading device and apply tensile force at a constant speed along the terminal axis until the connection point between the terminal of the wire harness and the wire breaks. Collect and record the tensile force displacement curve in real time throughout the entire tensile process, and record the maximum tensile force value. Step 3: Reset after testing: After the test is completed, release the clamping device, take out the wire harness sample that has been tested, and the loading device moves and returns to the standby state to prepare for the next test.

[0013] As described above, the advantages of this invention are: The support component in this device drives a wedge block to move horizontally by rotating a knob, which in turn causes a support plate to move vertically, actively supporting the terminal and counteracting the rotational torque caused by the terminal's own weight. Combined with a transparent window for observation of the terminal, this ensures the terminal remains horizontal before and during testing, guaranteeing alignment with the tensile axis. Furthermore, the lifting height of the support plate can be adjusted via the wedge block, allowing the device to accommodate terminals of different sizes and weights. This solves the problem in existing technologies where excessive terminal weight causes rotation. By supporting the terminal portion of the new material automotive wiring harness, it ensures that the tensile force is applied along the terminal's axial direction during tensile testing, thus providing a stable tensile force.

[0014] The support component in this device, through the setting of multiple freely rotatable support wheels, supports the wires of the automotive wiring harness under test, ensuring that the wires remain horizontal before and during the tensile test. This solves the problem in the prior art where, if the wires of the automotive wiring harness under test are heavy, the method of straightening the wires in advance leads to the test results being affected by unknown pre-tension, resulting in deviations. In this way, by supporting the wires of the new material automotive wiring harness, the tensile force is ensured to be transmitted along the axial direction of the wiring harness, thereby applying a stable tensile force.

[0015] The limiting component in this device, by adjusting the distance between the moving seats, limits the outer ring surface of the contact wheel on the new material automotive wiring harness, solving the problem of mismatch between the hole wall size of the U-shaped hole and the wire diameter. This prevents the wire from swinging and generating lateral force during the tensile test, which would lead to deviations in the test results. In this way, by limiting the wire part of the new material automotive wiring harness to the left and right, a stable axial tensile force can be applied during the test. Attached Figure Description

[0016] Figure 1 This is a front perspective view of the overall structure of the present invention; Figure 2 This is a three-dimensional schematic diagram of the terminal chuck, knob, and related components shown in the present invention; Figure 3 This is a three-dimensional schematic diagram showing the wedge-shaped block and connecting column components of the present invention; Figure 4 This is a three-dimensional schematic diagram of the circular hole and annular groove components shown in this invention; Figure 5 This is an exploded three-dimensional schematic diagram of the support disk and annular groove shown in the present invention; Figure 6 This is a three-dimensional schematic diagram of the wedge block one and wedge block two components shown in this invention; Figure 7 This is an exploded three-dimensional schematic diagram of the T-shaped guide rail and T-shaped guide groove shown in this invention; Figure 8 This is a three-dimensional schematic diagram of the base and loading device components shown in this invention; Figure 9 This is a three-dimensional schematic diagram of the base and movable seat components shown in this invention; Figure 10 This is a three-dimensional schematic diagram of the fixed frame and supporting wheels and related components shown in this invention; Figure 11 This is an exploded three-dimensional schematic diagram of the movable seat and cylindrical tube shown in this invention.

[0017] The reference numerals in the accompanying drawings of this invention are as follows: 1. Workbench; 2. Loading device; 3. Terminal chuck; 4. U-shaped hole; Support components: 51. Rectangular cavity; 52. Threaded rod; 53. Wedge block one; 54. Wedge block two; 55. Guide rail; 56. Guide groove; 57. Annular groove; 58. Circular hole; 59. Support plate; 510. Connecting column; 511. Knob one; Limiting components: 61. Base; 62. Slide rod; 63. Two-way lead screw; 64. Moving seat; 65. Cylindrical tube; 66. Contact wheel; 67. Fixing frame; 68. Fixing frame; 69. Support wheel; 610. Knob 2. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The embodiments provided by the present invention will be described in detail below: A static load distribution test fixture for automotive wiring harnesses, such as Figures 1 to 3 As shown, the device includes a workbench 1 and a loading device 2. The loading device 2 is horizontally slidably connected to the upper surface of the workbench 1. The loading device 2 is used to apply tensile force. A clamping device is horizontally slidably connected to the loading device 2. The clamping device is used to fix the wire part of the automotive wiring harness to be tested. A terminal chuck 3 is rotatably connected to the upper surface of the workbench 1. Multiple U-shaped holes 4 are circumferentially opened on the outer surface of the terminal chuck 3. The U-shaped holes 4 are used to limit the terminal part of the wiring harness to be tested. The wall size of each U-shaped hole 4 is different, but the bottom surface of the inner wall of each U-shaped hole 4 is located in the same plane, that is, the height is consistent.

[0020] like Figures 2 to 7 As shown, a support assembly is provided on the terminal chuck 3. The support assembly includes a rectangular cavity 51, which is opened inside the terminal chuck 3. A threaded rod 52 is rotatably connected inside the rectangular cavity 51. A wedge block 1 53 is horizontally slidably connected inside the rectangular cavity 51, and a wedge block 2 54 is vertically slidably connected inside the rectangular cavity 51. The wedge block 1 53 is located below the wedge block 2 54, and the inclined surface of the wedge block 1 53 is in contact with the inclined surface of the wedge block 2 54. Two T-shaped guide rails 55 are symmetrically fixedly connected to the inclined surface of the wedge block 1 53, and two T-shaped guide grooves 56 are symmetrically opened on the inclined surface of the wedge block 2 54. An annular groove 57 is opened on the surface of the terminal chuck 3. Multiple circular holes 58 are equidistantly opened on the surface of the annular groove 57. A support plate 59 is vertically slidably connected inside the annular groove 57. Multiple connecting posts 510 are equidistantly fixedly connected to the bottom surface of the support plate 59, and the positions of the connecting posts 510 correspond to the positions of the circular holes 58.

[0021] like Figure 8 and Figure 9As shown, a limiting component is provided on the workbench 1. The limiting component includes a base 61 and a fixing frame 67. The base 61 is located between the loading device 2 and the terminal chuck 3. The fixing frame 67 is located in the middle of the base 61. The base 61 is fixedly connected to the upper surface of the workbench 1, and the fixing frame 67 is fixedly connected to the inner bottom surface of the base 61. A fixing frame 68 is inserted into the fixing frame 67. Multiple support wheels 69 are equidistantly rotatably connected to the fixing frame 68. The multiple support wheels 69 are arranged in parallel, and the central axis of the support wheels 69 is on the same horizontal line as the central axis of the clamping device and the loading device 2. When the support wheels 69 wear out after long-term use, the fixed frame 68 with the insertion design is used to facilitate the replacement of the entire row of support wheels 69.

[0022] Furthermore, such as Figure 4 , Figure 6 and Figure 7 As shown, each T-shaped guide rail 55 is slidably adapted to the adjacent T-shaped guide groove 56. Through the cooperation between the T-shaped guide rail 55 and the T-shaped guide groove 56, when the wedge block 1 53 moves horizontally, it will drive the wedge block 2 54 to move vertically. Multiple transparent windows are equidistantly arranged in a ring on the outer wall of the terminal chuck 3. The multiple transparent windows are all set as rectangles. The transparent windows and U-shaped holes 4 are staggered. The staff can observe whether the terminal part of the wire harness under test is in a horizontal state through the transparent windows.

[0023] Furthermore, such as Figure 4 As shown, wedge block 53 is threadedly connected to threaded rod 52, and knob 511 is rotatably connected to the outer ring surface of terminal chuck 3. Knob 511 is interference-fitted with terminal chuck 3. The interference fit requires a certain amount of force from the operator to rotate knob 511. Knob 511 is fixedly connected to threaded rod 52 through mounting shaft 1. Knob 511 can drive threaded rod 52 to rotate.

[0024] Furthermore, such as Figure 3 , Figure 4 and Figure 6 As shown, one of the circular holes 58 is connected to the rectangular cavity 51, and one of the connecting posts 510 is fixedly connected to the upper surface of the second wedge block 54. Through the connecting action of the connecting posts 510, the second wedge block 54 can drive the support plate 59 to move vertically together. Each connecting post 510 is vertically slidably adapted to the nearby circular hole 58.

[0025] Furthermore, such as Figure 8 , Figure 9 and Figure 11 As shown, the limiting assembly includes two slide rods 62, each symmetrically arranged. Both slide rods 62 are fixedly connected to the inner wall of the base 61. The outer surfaces of both slide rods 62 are slidably connected to two movable seats 64, which are also symmetrically arranged. Figure 9As shown, two movable seats 64 are located on both sides of the fixed frame 67. Two cylindrical tubes 65 are symmetrically inserted into the upper surface of each movable seat 64. A contact wheel 66 is rotatably connected to the outer ring surface of each cylindrical tube 65. When the contact wheel 66 wears out after long-term use, the cylindrical tubes 65 with the insertion design are used to facilitate the replacement of the contact wheel 66.

[0026] Furthermore, such as Figure 9 As shown, the limiting assembly includes a bidirectional lead screw 63. The outer surface of the bidirectional lead screw 63 is provided with two sections of threads in opposite directions. Two slide rods 62 are arranged parallel to the bidirectional lead screw 63, and the two slide rods 62 and the bidirectional lead screw 63 pass through the bottom of the fixed frame 67. The two ends of the bidirectional lead screw 63 are rotatably connected to the base 61. The bidirectional lead screw 63 is threadedly connected to two movable seats 64, and the two movable seats 64 are respectively located on the two sections of threads in opposite directions on the bidirectional lead screw 63.

[0027] Furthermore, such as Figure 9 As shown, a knob 610 is rotatably connected to the outer wall of the base 61. The knob 610 is interference-fitted with the base 61, which requires a certain amount of force from the operator to rotate the knob 610. The knob 610 is fixedly connected to the bidirectional lead screw 63 through the mounting shaft 61. The bidirectional lead screw 63 can be driven to rotate by the knob 610.

[0028] Furthermore, such as Figure 10 and Figure 11 As shown, each contact wheel 66 and each support wheel 69 is made of cast nylon material. Cast nylon material has a low coefficient of friction and high wear resistance. During the tensile test, since both the contact wheel 66 and the support wheel 69 are designed to rotate freely around their axis, when the wire harness moves axially during the test, the friction generated between the contact wheel 66, the support wheel 69 and the wire part is rolling friction. Due to the low coefficient of friction, the axial resistance generated can be ignored.

[0029] Furthermore, a testing method for the test fixture is proposed, comprising the following steps: Step 1, Wire Harness Clamping and Adjustment: Place the wire harness to be tested into the U-shaped hole 4, ensuring that the terminal part of the wire harness is inside the terminal chuck 3 and the wire part is inside the U-shaped hole 4, and extends a distance towards the loading device 2. Through the support component and the limiting component, the wire harness to be tested is kept horizontal. Then, use the clamping device to fix the wire extension part. Step 2, Tensile Test and Data Acquisition: Start loading device 2 and apply tensile force at a constant speed along the terminal axis until the connection point between the terminal of the wire harness and the wire breaks. Collect and record the tensile force displacement curve in real time throughout the entire tensile process, and record the maximum tensile force value. Step 3, Post-test reset: After the test is completed, release the clamping device, take out the wire harness sample that has been tested, and the loading device 2 moves and returns to the standby state to prepare for the next test.

[0030] During work: This device can support new automotive wiring harnesses with heavier terminals. The detailed steps are as follows: Based on the terminal size and wire diameter of the automotive wiring harness to be tested, the operator selects a U-shaped hole 4 with a suitable diameter. Then, the terminal chuck 3 is rotated, causing the selected U-shaped hole 4 to rotate to the side closer to the base 61. Figure 8 As shown, the automotive wiring harness to be tested is placed into the U-shaped hole 4, with the terminal at the end of the wiring harness located inside the terminal chuck 3, and the wire behind the terminal located inside the U-shaped hole 4 and extending out of the U-shaped hole 4. The extended wire passes through the support wheel 69 and is placed in the clamp set on the loading device 2. If the terminal of the wiring harness to be tested is heavy, its center of gravity will deviate from the groove support edge of the U-shaped hole 4. Under its own weight, the terminal will rotate around the groove edge of the U-shaped hole 4, causing the terminal to be unable to maintain a horizontal state, which in turn leads to a decrease in the coaxiality and stability of the subsequent tensile test.

[0031] After the automotive wiring harness to be tested is placed, the operator rotates knob 511 clockwise. Knob 511 rotates clockwise along mounting shaft 52, causing wedge block 53 to move horizontally along rectangular cavity 51 away from knob 511. During this process, the horizontal movement of wedge block 53 pushes wedge block 54, causing wedge block 54 to move vertically upward along rectangular cavity 51, thereby causing connecting post 510 and support plate 59 to move vertically upward. The operator observes the rising position of support plate 59 through the rectangular transparent window on the outer ring of terminal chuck 3 while rotating knob 511. When the upper surface of support plate 59 is in contact with the bottom surface of terminal, knob 511 is rotated again, so that support plate 59 supports and supports terminal. This supporting force can counteract the rotational torque generated by the terminal's own weight, allowing the terminal to overcome its own weight rotation tendency and remain stably horizontally arranged. When the terminal is in a horizontal state, knob 511 is stopped.

[0032] In the above process, the support component in this device drives the wedge block 53 to move horizontally by rotating the knob 511, which in turn causes the wedge block 54 to drive the support plate 59 to move vertically, actively supporting the terminal and counteracting the rotational torque generated by the terminal's own weight. Combined with the transparent window for observation of the terminal, the terminal is kept horizontal before and during the test, ensuring alignment with the tensile axis. Furthermore, the lifting height of the support plate 59 can be adjusted by the wedge block 53, allowing the device to adapt to terminals of different sizes and weights. This solves the problem in the prior art where excessive terminal weight causes the terminal to rotate. In this way, by supporting the terminal part of the new material automotive wiring harness, it is ensured that the tensile force can be applied along the axial direction of the terminal during the tensile test, thereby applying a stable tensile force.

[0033] This device can limit and support the conductor portion of the new material automotive wiring harness. The detailed steps are as follows: After the terminals of the automotive wiring harness under test are supported, the operator rotates knob 610 clockwise. Knob 610 drives the bidirectional lead screw 63 to rotate clockwise via mounting shaft 2. During the clockwise rotation of the bidirectional lead screw 63, the two moving seats 64 move along the slide rod 62 towards the side closer to the fixed frame 67, i.e., they move closer to each other. The moving seats 64 drive the contact wheels 66 to move together. When the operator observes that all four contact wheels 66 are in contact with the outer surface of the wires of the automotive wiring harness, the operator stops rotating knob 610. At this time, the four contact wheels 66 limit the outer ring surface of the wires, and multiple support wheels 69 support the wires. In this way, the central axis of the wire portion of the wiring harness coincides with the central axis of the loading device 2, ensuring that the tensile force can be transmitted axially along the wires during subsequent tensile testing without deflection.

[0034] In the above process, the support component in this device, by setting multiple freely rotatable support wheels 69, supports the wires of the automotive wiring harness under test, so that the wires remain horizontal before and during the tensile test. This solves the problem in the prior art that if the wire part of the automotive wiring harness under test is heavy, the method of straightening the wire in advance will cause the test results to be superimposed with unknown pre-tension force and thus cause deviation. In this way, by supporting the wire part of the new material automotive wiring harness, the tensile force is ensured to be transmitted along the axial direction of the wiring harness, thereby applying a stable tensile force.

[0035] In the above process, the limiting component in this device, by adjusting the distance between the moving seats 64, allows the contact wheel 66 to limit the outer ring surface of the wire of the new material automotive wiring harness, solving the problem of mismatch between the hole wall size of the U-shaped hole 4 and the wire diameter, and avoiding the wire from swinging and generating lateral force during the tensile test, which would cause deviation in the test results. In this way, by limiting the wire part of the new material automotive wiring harness to the left and right, it is ensured that a stable axial tensile force can be applied during the test.

[0036] After the vehicle wiring harness is positioned and supported, the operator uses the clamping device on the loading device 2 to clamp the wire portion of the new material vehicle wiring harness. The loading device 2 is then activated by the controller to apply tensile force for testing. When the connection point between the terminal and the wire of the vehicle wiring harness breaks, the measured value is the maximum tensile force value. At this point, the tensile force test is complete. After the tensile force test is completed, the clamping device is released, and the vehicle wiring harness that has completed the tensile force test is removed. The above steps are then repeated for another new vehicle wiring harness of the same type.

[0037] After the test is completed, repeat the above steps in reverse. Reverse knob 2 610 to reverse the bidirectional lead screw 63, which in turn moves both movable seats 64 along the slide bar 62 away from the fixed frame 67 until both movable seats 64 return to their initial positions. At this point, stop rotating knob 2 610. Then reverse knob 1 511 to reverse the threaded rod 52, which in turn moves wedge block 1 53 along the rectangular cavity 51 towards the side closer to knob 1 511. Through the T-shaped guide rail 55 and T-shaped guide groove 56, wedge block 2 54 moves vertically downward along the rectangular cavity 51, thereby driving the support plate 59 to move vertically downward until the support plate 59 returns to its initial position. At this point, stop rotating knob 1 511 for the next test.

[0038] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A static load distribution test frame for automotive wiring harnesses, comprising a workbench (1) and a loading device (2), characterized in that, The loading device (2) is slidably connected to the workbench (1). A clamping device is slidably connected to the loading device (2). A terminal chuck (3) is rotatably connected to the surface of the workbench (1). Multiple U-shaped holes (4) are circumferentially opened on the terminal chuck (3). The hole wall size of each U-shaped hole (4) is different. The terminal chuck (3) is provided with a support component, which is a support plate (59) that can be raised and lowered inside the terminal chuck (3). The workbench (1) is provided with a limiting component, which includes a base (61) and a fixing frame (67). The base (61) is fixedly connected to the workbench (1), and the fixing frame (67) is fixedly connected to the base (61). A fixing frame (68) is inserted into the fixing frame (67), and multiple support wheels (69) are equidistantly rotatably connected inside the fixing frame (68).

2. The automotive wiring harness static load distribution test fixture according to claim 1, characterized in that, The support assembly includes a rectangular cavity (51), which is located inside the terminal chuck (3). A threaded rod (52) is rotatably connected inside the rectangular cavity (51). A wedge block one (53) and a wedge block two (54) are slidably connected inside the rectangular cavity (51). Two T-shaped guide rails (55) are symmetrically fixedly connected to the wedge block one (53). Two T-shaped guide grooves (56) are symmetrically opened on the wedge block two (54). An annular groove (57) is opened on the surface of the terminal chuck (3). Multiple circular holes (58) are equidistantly opened on the surface of the annular groove (57). A support plate (59) is slidably connected inside the annular groove (57). Multiple connecting posts (510) are equidistantly fixedly connected to the bottom of the support plate (59). Each T-shaped guide rail (55) is slidably adapted to the adjacent T-shaped guide groove (56). Multiple transparent windows are equidistantly arranged on the outer wall of the terminal chuck (3). All of the multiple transparent windows are rectangular.

3. The automotive wiring harness static load distribution test fixture according to claim 1, characterized in that, The wedge block (53) is threadedly connected to the threaded rod (52), and the outer ring surface of the terminal chuck (3) is rotatably connected to the knob (511). The knob (511) is interference-fitted with the terminal chuck (3), and the knob (511) is fixedly connected to the threaded rod (52).

4. The automotive wiring harness static load distribution test fixture according to claim 1, characterized in that, One of the circular holes (58) is connected to the rectangular cavity (51), and one of the connecting posts (510) is fixedly connected to the second wedge block (54). Each of the connecting posts (510) is slidably adapted to the adjacent circular hole (58).

5. The automotive wiring harness static load distribution test fixture according to claim 1, characterized in that, The limiting component includes a slide rod (62), two slide rods (62) are symmetrically arranged, both slide rods (62) are fixedly connected to the base (61), and a movable seat (64) is slidably connected to both slide rods (62). Two movable seats (64) are symmetrically arranged, and two cylindrical tubes (65) are symmetrically inserted into the surface of each movable seat (64). A contact wheel (66) is rotatably connected to the outer ring surface of each cylindrical tube (65).

6. The automotive wiring harness static load distribution test fixture according to claim 1, characterized in that, The limiting component includes a bidirectional lead screw (63), which is rotatably connected to the base (61) and threadedly connected to two movable seats (64).

7. The automotive wiring harness static load distribution test fixture according to claim 1, characterized in that, The outer wall of the base (61) is rotatably connected to a knob two (610), the knob two (610) is interference-fitted with the base (61), and the knob two (610) is fixedly connected to a two-way lead screw (63).

8. The automotive wiring harness static load distribution test fixture according to claim 5, characterized in that, Each of the contact wheels (66) and each of the support wheels (69) is made of cast nylon.

9. A test fixture for static load distribution of automotive wiring harnesses according to claims 1-8 is now proposed, characterized in that: Includes the following steps: Step 1, wire harness clamping and adjustment: Place the wire harness to be tested into the U-shaped hole (4), ensuring that the terminal part of the wire harness is inside the terminal chuck (3) and the wire part is inside the U-shaped hole (4), and extends a distance towards the loading device (2). Through the support component and the limiting component, the wire harness to be tested is kept horizontal. Then, use the clamping device to fix the wire extension part. Step 2, Tensile test and data acquisition: Start the loading device (2) and apply tensile force at a constant speed along the terminal axis until the connection point between the terminal of the wire harness and the wire breaks. Collect and record the tensile displacement curve during the entire tensile process in real time, and record the maximum tensile force value. Step 3, Reset after testing: After the test is completed, release the clamping device, take out the wire harness sample that has been tested, and the loading device (2) moves and returns to the standby state to prepare for the next test.

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