Low-voltage wire harness detection device and detection method

Abstract

The invention discloses a low-voltage wire harness detection device and method, and relates to the technical field of low-voltage wire harness detection.The low-voltage wire harness detection device comprises a detection workbench, a display screen is fixedly connected to the top of the detection workbench, a frame is fixedly connected to the upper surface of the detection workbench, and a detection assembly is arranged in the frame; the detection assembly comprises a moving frame slidably connected in the frame, and the two sides of the moving frame are fixedly connected with sealing strips. The detection connector can be adjusted in a small range by horizontally moving the detection connector, the problem that the terminal of the low-voltage wire harness cannot be effectively plugged due to the short wire harness is avoided, and in addition, for some long wire harnesses, the detection connector can be pushed and pulled to be far away from the terminal of the low-voltage wire harness, so that the detection efficiency is improved. Therefore, when the terminal of the low-voltage wiring harness is plugged with the detection connector, the wiring harness is prevented from being wound or stacked together, and the situation that the wiring harness is disordered and the line direction of the low-voltage wiring harness group is inconvenient to observe is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage wire harness detection, and in particular to a low-voltage wire harness detection device and a detection method. Background Art

[0002] The low-voltage wiring harness is the nerve of the automotive electrical system, and it undertakes core functions such as power distribution, signal transmission, and equipment control. Its reliability directly affects key links such as the vehicle's power performance, safety warnings, and intelligent interaction. Currently, the low-voltage wiring harness is mainly tested through a testing workbench. The testing workbench integrates an automatic terminal docking mechanism, a multi-channel electrical parameter acquisition module, an AI algorithm analysis system, and a rapid changeover tooling to achieve full-process automated testing from terminal insertion to fault location.

[0003] However, the connectors for plugging in the low-voltage wiring harness terminals on the existing inspection workbench are all in fixed positions. For some different models of low-voltage wiring harnesses, the terminals cannot be plugged in because the low-voltage wiring harness is too short. In addition, for some longer low-voltage wiring harnesses, curling and accumulation problems may occur due to their excessive length, which may easily affect the inspection of the low-voltage wiring harness. In addition, the connectors on the existing inspection workbench are directly exposed to the outside, which may easily enter dust or foreign matter. Over time, this may lead to loose connection between the connector and the low-voltage wiring harness terminal, resulting in poor contact. The connector will wear out due to long-term plugging and unplugging of the terminal, and the terminal may become loose after being inserted into the connector, thereby causing unstable inspection. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a low-voltage wire harness detection device and detection method.

[0005] The technical solution is as follows: A low-voltage wiring harness fault detection workbench includes a detection workbench, a display screen is fixedly connected to the top of the detection workbench, a frame is fixedly connected to the upper surface of the detection workbench, and a plurality of detection components are arranged inside the frame; The detection component includes a moving frame slidably connected to the frame, and sealing strips are fixedly connected to both sides of the moving frame. The ends of the two sealing strips away from the moving frame are fixedly connected to the inner wall of the frame. A detection joint is inserted into the interior of the moving frame, and two card slots 1 are provided at the bottom of the inner wall of the moving frame. Two springs 1 are fixedly connected to the bottom of the detection joint, and the ends of the two springs 1 away from the connection with the detection joint are fixedly connected to a card block 1. The ends of the two card blocks 1 away from the spring 1 are respectively engaged with the two card slots 1. Two springs 2 are fixedly connected to the interior of the detection joint, and the tops of the two springs 2 are fixedly connected to release rods.

[0006] Furthermore, extension plates are fixedly connected to both sides of the top of the detection joint, a groove adapted to the extension plate is provided on the top of the movable frame, two movable grooves are provided at the bottom of the detection joint, a card block slides inside the movable groove, an oblique groove is provided in the middle of the card block, and a through groove for horizontal sliding of the release rod is provided inside the detection joint, the bottom of the release rod is set to an inclined surface adapted to the oblique groove of the card block, the bottom inclined surface of the release rod conflicts with the oblique groove of the card block, and the top of the release rod protrudes from the upper surface of the detection joint.

[0007] Furthermore, a fixed component is provided on the upper surface of the detection connector, and the fixed component includes a mounting platform placed on the upper surface of the movable frame. Four springs three are fixedly connected to the interior of the mounting platform, and each of the four springs three is fixedly connected to a clamping block two at one end away from the connection with the mounting platform. A clamping slot two corresponding to the positions of the four clamping blocks two is provided on the top of the detection connector.

[0008] Furthermore, an opening is provided in the middle of the mounting platform, and four sliding grooves are provided on the mounting platform for the sliding of the card block 2. The card block 2 is composed of a vertical plate and a triangular block, and the card groove 2 is set in an L shape.

[0009] Furthermore, the fixing assembly also includes two fixing frames fixedly connected to the top of both sides of the mounting platform, two connecting rods are fixedly connected between the two fixing frames, two fixing blocks are slidably connected to the two connecting rods, and two springs four are respectively sleeved on the two connecting rods, and the two ends of each spring four are fixedly connected to the fixing frame and the fixing block.

[0010] Furthermore, a soft rubber block is provided in the middle of the surfaces of the two fixing blocks that are close to each other, and the size of the soft rubber block is adapted to the opening size of the mounting platform.

[0011] A low-voltage wiring harness fault detection method comprises the following steps: Step 1: Push and pull the moving frame horizontally. The moving frame slides within the frame, driving the detection connector to adjust its position synchronously to solve the difficulty of plugging in short wire harnesses. Step 2: Press the release lever, which moves downward to push the card block 1 and compress the spring 1, so that the card block 1 is out of the card slot 1, and the old test connector can be removed; Step 3: Move the mounting platform from top to bottom close to the detection connector. Clamp Block 2 slides under pressure. After insertion, Spring 3 resets and secures it. To remove, push Clamp Block 2 out of Slot 2 and pull the mounting platform to remove it, allowing for flexible adaptation to any scenario. Step 4: When the low-voltage harness is not being tested, the two fixing blocks are closed to seal the opening of the mounting platform to prevent dust and oxidation, thereby extending the service life of the connector; Step 5: After plugging in the terminals, the soft rubber blocks on the two fixing blocks will clamp and wrap the terminals of the low-voltage wiring harness to prevent them from loosening; Step 6: After the terminal is inserted into the test connector, the test workbench sends a weak current to the low-voltage wiring harness through the test connector to confirm whether each line is conductive, check for open circuit or short circuit, simulate the actual working voltage and signal, and test the transmission stability of the wiring harness. If the test is abnormal, the faulty line is locked by segmented troubleshooting, the problem point is recorded, and displayed and recorded on the display screen, and finally a test report is output.

[0012] As described above, the beneficial effects of the low-voltage wire harness detection device and detection method in the present invention are as follows: The horizontally movable detection connector can be adjusted within a small range to avoid the problem that the low-voltage wiring harness terminals cannot be effectively plugged in due to the short wiring harness. In addition, for some long wiring harnesses, the detection connector can be pushed and pulled away from the low-voltage wiring harness terminals, thereby preventing the low-voltage wiring harness terminals from being tangled or piled up when plugging them into the detection connector, avoiding the wiring harness being cluttered and making it difficult to observe the low-voltage wiring harness group line direction; The detachable detection connector can adapt to different terminals of the low-voltage wiring harness group, improving the detection adaptability of the low-voltage wiring harness. In addition, the quick detachable and replaceable method can improve the maintenance efficiency of the detection connector and avoid the impact of damage to the detection connector on the low-voltage wiring harness detection. The opening in the middle of the mounting platform can be blocked by two mutually fitting fixing blocks, thereby sealing the detection connector to prevent dust and other foreign matter from entering the detection connector when not in use, thereby preventing foreign matter or dust from causing poor contact between the low-voltage wiring harness terminal and the detection connector, ensuring that the low-voltage wiring harness terminal can be effectively plugged into the detection connector. At the same time, it can also prevent the detection connector from oxidizing when not in use for a long time, thereby increasing the service life of the detection connector. The low-voltage wiring harness terminals are clamped and wrapped by the soft rubber blocks on the two fixed blocks to avoid poor contact caused by loose connection between the low-voltage wiring harness terminals and the detection connector during the detection process, thereby improving the stability of the connection between the low-voltage wiring harness terminals and the detection connector, and further ensuring stable detection of the low-voltage wiring harness terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the overall components of the present invention; Figure 2 It is a three-dimensional schematic diagram of the frame, moving frame and other components of the present invention; Figure 3 It is a partial three-dimensional schematic diagram of the frame, sealing strip and other components of the present invention; Figure 4 It is a partial three-dimensional schematic diagram of the frame, movable frame, sealing strip and other components of the present invention; Figure 5 This is a three-dimensional schematic diagram of the components of the present invention, including the moving frame, detection joint, and mounting platform; Figure 6 This is a three-dimensional schematic diagram of the movable frame, sealing strip, card slot and other components of the present invention; Figure 7 This is a three-dimensional schematic diagram of the detection joint of the present invention; Figure 8 This is a schematic sectional perspective view of the detection connector, the first clamping block, the release lever and other components of the present invention; Figure 9 This is a three-dimensional schematic diagram of the spring 1, the clamping block 1 and other components of the present invention; Figure 10 This is a three-dimensional schematic diagram of the spring three, the clamping block two, the clamping slot two and other components of the present invention; Figure 11 It is a three-dimensional schematic diagram of the fixing frame, connecting rod, fixing block and other components of the present invention.

[0014] Wherein, the accompanying drawings in the present invention are: 1. Inspection workbench; 2. Display screen; Detection components: 31. Frame; 32. Moving frame; 33. Sealing strip; 34. Detection connector; 35. Slot 1; 36. Spring 1; 37. Block 1; 38. Spring 2; 39. Release lever; Fastening components: 41. Mounting platform; 42. Spring three; 43. Block two; 44. Slot two; 45. Fixing bracket; 46. Connecting rod; 47. Fixing block; 48. Spring four. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] The embodiments provided by the present invention will be described in detail below: like Figures 1 to 9 As shown, a low-voltage wiring harness fault detection workbench includes a detection workbench 1, a display screen 2 is fixedly connected to the top of the detection workbench 1, and the display screen 2 is used to display the detected data after detecting the low-voltage wiring harness of an automobile. The upper surface of the detection workbench 1 is fixedly connected to a frame 31, and the interior of the frame 31 is provided with multiple detection components for detecting the low-voltage wiring harness of an automobile; The detection assembly includes a moving frame 32 that is slidably connected to the frame 31. Sealing strips 33 are fixedly connected to both sides of the moving frame 32. The ends of the two sealing strips 33 away from the moving frame 32 are fixedly connected to the inner wall of the frame 31. A detection connector 34 is inserted into the interior of the moving frame 32. Two card slots 35 are provided at the bottom of the inner wall of the moving frame 32. Two springs 36 are fixedly connected to the bottom of the detection connector 34. The ends of the two springs 36 away from the connection with the detection connector 34 are fixedly connected to a card block 37. The ends of the two card blocks 37 away from the spring 36 are respectively engaged with the two card slots 35. Two springs 38 are fixedly connected to the interior of the detection connector 34. The tops of the two springs 38 are fixedly connected to a release rod 39.

[0017] It should be noted that the detection connector 34 is an interface panel on the existing automotive low-voltage wiring harness detection device, which includes a socket. Extension plates are fixedly connected to both sides of the top of the detection connector 34, and a groove compatible with the extension plate is provided on the top of the movable frame 32. After the detection connector 34 is inserted into the interior of the movable frame 32, the extension plate of the detection connector 34 can be embedded in the groove of the movable frame 32 to prevent the detection connector 34 from falling. Two movable grooves corresponding to the position of the card slot 1 35 are provided at the bottom of the detection connector 34. The card block 1 37 slides inside the movable groove. An oblique groove is provided in the middle of the card block 1 37. A through groove is provided inside the detection connector 34 for the horizontal sliding of the release rod 39. The bottom of the release rod 39 is set as an inclined surface compatible with the oblique groove of the card block 1 37. The bottom inclined surface of the release rod 39 conflicts with the oblique groove of the card block 1 37, and the top of the release rod 39 protrudes from the upper surface of the detection connector 34.

[0018] Specifically, the current inspection of automobile low-voltage wiring harnesses mainly involves plugging multiple terminals of a group of low-voltage wiring harnesses into multiple inspection connectors 34 on the inspection workbench 1. However, the existing inspection connectors 34 are mostly fixed. For low-voltage wiring harness groups with different combinations, some terminals may not be effectively plugged in due to insufficient cable length, which makes it impossible to effectively detect faults in the low-voltage wiring harness. At this time, a movable frame 32 in a detection component can be pushed and pulled arbitrarily. The movable frame 32 slides horizontally inside the frame 31. The movement of the movable frame 32 can drive the inspection connector 34 inserted therein to slide horizontally synchronously. By horizontally moving the inspection connector 34, it can be adjusted within a small range to avoid the problem that the terminals of the low-voltage wiring harness cannot be effectively plugged in due to the short wiring harness. In addition, for some longer wiring harnesses, the inspection connector 34 can also be pushed and pulled to keep it away from the terminals of the low-voltage wiring harness, so that the terminals of the low-voltage wiring harness are prevented from being entangled or stacked together when being plugged into the inspection connector 34, thereby avoiding the wiring harness being cluttered and inconvenient to observe the line direction of the low-voltage wiring harness group.

[0019] It should be noted that when the movable frame 32 moves horizontally, the movable frame 32 will pull the sealing strip 33 on one side to unfold it, and the movable frame 32 will also push the sealing strip 33 on the other side to fold it. By synchronously unfolding and folding the sealing strip 33 according to the movable frame 32, the sealing strip 33 can always seal the frame 31 after the movable frame 32 moves, thereby preventing dust or other foreign matter from entering the interior of the detection workbench 1, and reducing the pollution caused by dust or foreign matter to the interior of the detection workbench 1.

[0020] When the release lever 39 moves downward, it compresses the spring 2 38 . At the same time, when the release lever 39 moves downward, it pushes the inclined slot of the card block 1 37 through its inclined surface, causing the card block 1 37 to move in the movable slot toward the side close to the spring 1 36 , so that the spring 1 36 is compressed by the card block 1 37 . At the same time, the card block 1 37 moves and no longer engages with the card slot 1 35 . At this time, the detection connector 34 can be taken out from the movable frame 32 , and then another model or a new detection connector 34 can be replaced. The new detection connector 34 can be reinserted into the movable frame 32 . In this process, it is necessary to first press the card block 1 37 on the new detection connector 34 to make it move toward the side close to the spring 1 36 and compress the spring 1 36 . The spring 36 makes the block 37 away from the end of the spring 36 and flush with the outer surface of the detection connector 34, and then the detection connector 34 can be smoothly inserted into the interior of the movable frame 32. When the detection connector 34 is completely placed in the interior of the movable frame 32, the block 37 and the slot 35 are horizontally overlapped. Under the elastic reset action of the spring 36, the block 37 moves to one side of the slot 35 in the movable slot, and then the block 37 and the slot 35 are engaged. At this point, the replacement of the model or replacement and maintenance of the detection connector 34 is completed. The detachable detection connector 34 can adapt to different terminals of the low-voltage wiring harness group, thereby improving the detection adaptability of the low-voltage wiring harness. In addition, the quick replacement method can improve the maintenance efficiency of the detection connector 34, and avoid the impact of damage to the detection connector 34 on the low-voltage wiring harness detection.

[0021] It should be noted that when the detection connector 34 slides horizontally inside the frame 31, the sliding of the detection connector 34 will cause the two sealing strips 33 to push and fold or pull and unfold. The sealing strip 33 can always keep the detection connector 34 away from the terminal of the wiring harness group. This is mainly to pull the wiring harness before the wiring harness terminal can be plugged into the detection connector 34, thereby straightening the wiring harness or reducing the bending degree of the low-voltage wiring harness, so as to reduce the winding or accumulation of the low-voltage wiring harness.

[0022] like Figure 7 、 Figure 8 、 Figure 10 and Figure 11 As shown, the upper surface of the detection connector 34 is provided with a fixing component for fixing the low-voltage wiring harness terminal and the detection connector 34 when plugged in. The fixing component includes a mounting platform 41 placed on the upper surface of the movable frame 32. Four springs three 42 are fixedly connected to the interior of the mounting platform 41. The four springs three 42 are fixedly connected to a clamping block two 43 at one end away from the connection with the mounting platform 41. The top of the detection connector 34 is provided with four clamping slots two 44 corresponding to the positions of the clamping blocks two 43.

[0023] It should be noted that an opening is provided in the middle of the mounting platform 41 to facilitate the connection between the terminal of the low-voltage wiring harness and the detection connector 34 after passing through the opening. Four sliding grooves are provided on the mounting platform 41 for the sliding of the card block 2 43. The card block 2 43 consists of a vertical plate and a triangular block. The card slot 2 44 is set to be L-shaped to facilitate the right-angled triangle part at the bottom of the card block 2 43 to be effectively clipped into it.

[0024] Specifically, when the mounting platform 41 is mounted on the detection connector 34, the mounting platform 41 can be moved closer to the detection connector 34 from top to bottom. When the right-angled triangle portion at the bottom of the second clamping block 43 contacts the groove wall of the second clamping slot 44, the second clamping block 43 that is in contact will slide in the opening toward the side close to the third spring 42, and the third spring 42 will be compressed by the second clamping slot 44. When the right-angled triangle portion at the bottom of the second clamping block 43 completely enters the interior of the second clamping slot 44, the elastic return action of the third spring 42 will cause the second clamping block 43 to slide in the interior of the opening toward the side away from the third spring 42. At this time, the right-angled triangle portion at the bottom of the second clamping block 43 will be stuck in the interior of the second clamping slot 44, thereby achieving quick installation of the mounting platform 41. When the mounting platform 41 needs to be removed, the staff can push the block 2 43 from the mounting platform 41, so that the block 2 43 moves to the side close to the spring 3 42. At this time, the right-angled triangle part of the block 2 43 is no longer engaged with the slot 2 44. Then, the mounting platform 41 is pulled upward, and the mounting platform 41 will cause the right-angled triangle part of the block 2 43 to move out of the slot 2 44, thereby realizing the removal of the mounting platform 41.

[0025] like Figure 8 、 Figures 10 and 11 As shown, the fixing assembly also includes two fixing frames 45 fixedly connected to the tops of both sides of the mounting platform 41, two connecting rods 46 are fixedly connected between the two fixing frames 45, two fixing blocks 47 are slidably connected to the two connecting rods 46, and two springs four 48 are sleeved on the two connecting rods 46, and the two ends of each spring four 48 are fixedly connected to the fixing frame 45 and the fixing block 47 respectively.

[0026] It should be noted that a soft rubber block is provided in the middle of the surface where the two fixing blocks 47 are close to each other, and the size of the soft rubber block is adapted to the opening size of the mounting platform 41, and is used for elastic deformation to adapt to the shape of different types of low-voltage wiring harness terminals.

[0027] Specifically, when the terminal of the low-voltage wiring harness is not inserted into the detection connector 34, in addition, according to the above-mentioned mounting platform 41, it has been installed on the detection connector 34. Initially, under the action of spring four 48, the two fixing blocks 47 are made to fit together. The two fixing blocks 47 that fit together can block the opening in the middle of the mounting platform 41, thereby sealing the detection connector 34 to prevent dust and other foreign matter from entering the detection connector 34 when not in use, thereby avoiding foreign matter or dust from causing poor contact between the terminal of the low-voltage wiring harness and the detection connector 34, ensuring that the terminal of the low-voltage wiring harness can be effectively plugged into the detection connector 34, and at the same time preventing the detection connector 34 from being oxidized when not in use for a long time, thereby improving the service life of the detection connector 34.

[0028] In addition, when it is necessary to insert the terminal of the low-voltage wiring harness into the detection connector 34, the staff pushes the two fixing blocks 47 to both sides, so that the two fixing blocks 47 slide to both sides on the connecting rod 46. The two fixing blocks 47 will compress the spring four 48 when moving to both sides. At this time, the fixing blocks 47 no longer seal the top of the detection connector 34. Then the staff plugs the low-voltage wiring harness terminal that needs to be tested into the detection connector 34, and finally releases the fixing blocks 47. Under the elastic reset action of the spring four 48, the two fixing blocks 47 will slide toward the middle on the connecting rod 46. The soft rubber blocks on the two fixing blocks 47 will clamp and wrap the low-voltage wiring harness terminal, avoiding the loose connection between the low-voltage wiring harness terminal and the detection connector 34 during the detection process, resulting in poor contact, thereby improving the stability of the connection between the low-voltage wiring harness terminal and the detection connector 34, and further ensuring stable detection of the low-voltage wiring harness terminal.

[0029] In addition, if the fixed component is not needed for protection, the mounting platform 41 can be removed in the manner described above so that the entire fixed component is not installed on the detection connector 34. In addition, when replacing different models of detection connectors 34, the mounting platform 41 can be installed on different models for repeated use to adapt to different usage requirements.

[0030] A low-voltage wiring harness fault detection method comprises the following steps: Step 1: Push and pull the movable frame 32 horizontally. The movable frame 32 slides in the frame 31, driving the detection connector 34 to adjust its position synchronously, solving the difficulty of plugging in the short wire harness; Step 2: Press the release lever 39, which moves downward to push the clamping block 37 and compress the spring 36, so that the clamping block 37 is disengaged from the clamping slot 35, and the old detection connector 34 can be removed; Step 3: The mounting platform 41 is moved from top to bottom close to the detection connector 34. The second clamping block 43 is pressed and slides. After insertion, the third spring 42 is reset and fixed. When removing, push the second clamping block 43 out of the second clamping slot 44 and pull the mounting platform 41 to remove it, which can flexibly adapt to the scene. Step 4: When the low-voltage harness is not being tested, the two fixing blocks 47 are closed to block the opening of the mounting platform 41 to prevent dust and oxidation, thereby extending the service life of the connector; Step 5: After the terminals are plugged in, the soft rubber blocks on the two fixing blocks 47 will clamp and wrap the terminals of the low-voltage wiring harness to prevent them from loosening; Step 6: After the terminal is inserted into the detection connector 34, the detection workbench 1 sends a weak current to the low-voltage wiring harness through the detection connector 34 to confirm whether each line is conductive, check for open circuit or short circuit, simulate the actual working voltage and signal, and detect the transmission stability of the wiring harness. If the test is abnormal, the faulty line is locked through segmented troubleshooting, the problem point is recorded, and displayed and recorded on the display screen 2, and finally a test report is output.

[0031] The above description is only a preferred 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 in the scope of protection of the present invention.

Claims

1. A low-voltage wiring harness fault detection workbench, comprising a detection workbench (1), wherein a display screen (2) is fixedly connected to the top of the detection workbench (1), and characterized in that: The upper surface of the detection workbench (1) is fixedly connected to a frame (31), and a plurality of detection components are arranged inside the frame (31); The detection component includes a moving frame (32) slidably connected to the frame (31), and sealing strips (33) are fixedly connected to both sides of the moving frame (32). The ends of the two sealing strips (33) away from the moving frame (32) are fixedly connected to the inner wall of the frame (31). A detection connector (34) is inserted into the interior of the moving frame (32). Two card slots (35) are provided at the bottom of the inner wall of the moving frame (32). Two springs (36) are fixedly connected to the bottom of the detection connector (34). The ends of the two springs (36) away from the connection with the detection connector (34) are fixedly connected to a card block (37). The ends of the two card blocks (37) away from the spring (36) are respectively engaged with the two card slots (35). The interior of the detection connector (34) is fixedly connected to two springs (38), and the tops of the two springs (38) are fixedly connected to a release rod (39).

2. The low-voltage wiring harness fault detection workbench according to claim 1, characterized in that: Extension plates are fixedly connected to both sides of the top of the detection joint (34), a groove adapted to the extension plate is provided on the top of the movable frame (32), two movable grooves are provided at the bottom of the detection joint (34), a card block (37) slides inside the movable groove, an oblique groove is provided in the middle of the card block (37), a through groove for the horizontal sliding of the release rod (39) is provided inside the detection joint (34), the bottom of the release rod (39) is provided with an inclined surface adapted to the oblique groove of the card block (37), the bottom inclined surface of the release rod (39) conflicts with the oblique groove of the card block (37), and the top of the release rod (39) protrudes from the upper surface of the detection joint (34).

3. The low-voltage wiring harness fault detection workbench according to claim 1, characterized in that: A fixing assembly is provided on the upper surface of the detection joint (34), and the fixing assembly includes a mounting platform (41) placed on the upper surface of the movable frame (32). Four springs (42) are fixedly connected inside the mounting platform (41), and one end of each of the four springs (42) away from the end connected to the mounting platform (41) is fixedly connected to a clamping block (43). The top of the detection joint (34) is provided with a clamping slot (44) corresponding to the position of the four clamping blocks (43).

4. The low-voltage wiring harness fault detection workbench according to claim 3, characterized in that: An opening is provided in the middle of the mounting platform (41), and four slide grooves are provided on the mounting platform (41) for the second card block (43) to slide. The second card block (43) is composed of a vertical plate and a triangular block, and the second card groove (44) is set in an L shape.

5. The low-voltage wiring harness fault detection workbench according to claim 3, characterized in that: The fixing assembly also includes two fixing frames (45) fixedly connected to the tops of both sides of the mounting platform (41), two connecting rods (46) are fixedly connected between the two fixing frames (45), two fixing blocks (47) are slidably connected to the two connecting rods (46), and two springs (48) are sleeved on the two connecting rods (46), and the two ends of each spring (48) are fixedly connected to the fixing frame (45) and the fixing block (47), respectively.

6. The low-voltage wiring harness fault detection workbench according to claim 5, characterized in that: A soft rubber block is provided in the middle of one side of the two fixing blocks (47) that is close to each other, and the size of the soft rubber block is adapted to the opening size of the mounting platform (41).

7. According to the low-voltage wiring harness fault detection workbench according to any one of claims 1 to 6, a low-voltage wiring harness fault detection method is proposed, characterized in that: The following steps are involved: Step 1: Push and pull the movable frame (32) horizontally. The movable frame (32) slides in the frame (31), driving the detection connector (34) to adjust its position synchronously, thereby solving the difficulty of plugging in the short wiring harness; Step 2: Press the release lever (39), which moves downward to push the card block (37) and compress the spring (36), so that the card block (37) is disengaged from the card slot (35), and the old detection connector (34) can be removed; Step 3: The mounting platform (41) is moved from top to bottom close to the detection connector (34), the clamping block 2 (43) is pressed and slides, and the spring 3 (42) is reset and fixed after insertion; when removing, push the clamping block 2 (43) out of the clamping slot 2 (44), pull the mounting platform (41) to remove it, and flexibly adapt to the scene; Step 4: When the low-voltage wiring harness is not detected, the two fixing blocks (47) are closed to block the opening of the mounting platform (41) to prevent dust and oxidation, thereby extending the service life of the connector; Step 5: After the terminals are plugged in, the soft rubber blocks on the two fixing blocks (47) will clamp and wrap the terminals of the low-voltage wiring harness to prevent them from loosening; Step 6: After the terminal is inserted into the detection connector (34), the detection workbench (1) sends a weak current to the low-voltage wiring harness through the detection connector (34) to confirm whether each line is conductive, check for open circuit or short circuit, simulate the actual working voltage and signal, and detect the transmission stability of the wiring harness. If the test is abnormal, the faulty line is locked by segmented troubleshooting, the problem point is recorded, and the record is displayed on the display screen (2), and finally a test report is output.

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