Large-current constant-current source temperature rise testing device for new energy wiring harness

Abstract

The invention discloses a large-current constant-current source temperature rise testing device for a new energy wire harness, and the device comprises a box body, the interior of the box body is provided with a temperature measurement mechanism, the temperature measurement mechanism comprises a flat tube, the exterior of the flat tube is provided with a cooling assembly which is used for cooling when the temperature rise of the wire harness is abnormal, the exterior of the flat tube is provided with a stretching assembly, and the stretching assembly is used for stretching the wire harness. The flat tube is used for fixing and stretching two ends of the wire harness, the outer surface of the flat tube is fixedly connected with a fixing frame, the outer surface of the fixing frame is fixedly connected with the interior of the box body, and one end of the flat tube is fixedly connected with an arc piece. The problems that when a relay and a fuse fail, instant overload of a wire harness is caused, a wire is fused, an insulating layer is broken down or ignited, meanwhile, the wire harness needs to be stretched manually to be tightened, the tightening quality cannot be guaranteed, and the accuracy of a detection result is affected are solved.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, specifically to a high-current constant current source temperature rise testing device for new energy wiring harnesses. Background Technology

[0002] High-voltage wiring harnesses are used as a medium for transmitting electrical energy. However, high-voltage wiring harnesses generate a certain temperature due to resistance. Therefore, a temperature rise test is required after production to check their heat resistance. Since high-voltage wiring harnesses are relatively soft and do not easily fit tightly with temperature sensors, the accuracy of the test results is low. A temperature rise testing device for high-voltage wiring harnesses in electric vehicles, with application number CN202223604336.8, includes a first support leg, an anti-slip block, a second support leg, a limiting threaded hole, a bolt, and a base. The device uses the elastic force of a telescopic spring to make the middle part of the high-voltage wiring harness fit tightly with the resistance temperature sensor, making the measured temperature more accurate.

[0003] While this device possesses the aforementioned advantages, it still suffers from the following drawbacks during use: 1) The device is not equipped with protective measures. When the relay or fuse fails, it causes the wiring harness to be overloaded momentarily, which may lead to the wire melting, insulation layer being broken or ignited. At the same time, if the high voltage power supply is not disconnected in time after the test, the wire may be disconnected, which may also cause residual charge discharge. 2) The device clamps the wire harness with two sets of clamps, which can only keep the wire harness taut. To keep the wire harness taut, it still needs to be stretched manually, which is not only time-consuming and labor-intensive but also inefficient. In addition, the quality of the tension achieved by manual stretching cannot be guaranteed, which means that the tightness of the wire harness and the temperature sensor cannot be guaranteed, thus affecting the accuracy of the detection results.

[0004] Therefore, it is necessary to address the problems that still exist in the existing devices. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-current constant current source temperature rise testing device for new energy wiring harnesses. This solves the problems of existing high-voltage wiring harness temperature rise testing devices, which lack protective measures and cause instantaneous overload of the wiring harness when relays or fuses fail, leading to wire melting, insulation breakdown, or ignition. Additionally, the wiring harness requires manual stretching for tension, which compromises the quality of tension and affects the accuracy of the test results.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-current constant current source temperature rise testing device for new energy wiring harnesses, comprising a housing, an internal temperature measuring mechanism, a flat tube, an external cooling component for cooling the wiring harness in case of abnormal temperature rise, an external tensioning component for fixing and stretching both ends of the wiring harness, a fixed frame for fixing the outer surface of the flat tube, the outer surface of the fixed frame for fixing the inner surface of the housing, an arc plate for fixing one end of the flat tube, and an internal sliding... A sealing plate is dynamically connected, and a pin is fixedly connected to the outer surface of the sealing plate. One end of the pin is slidably connected to the body of the flat tube and extends to the outside of the flat tube. A retaining spring is sleeved on the outside of the pin. The two ends of the retaining spring are fixedly connected to the outer surface of the sealing plate and the inside of the flat tube, respectively. A displacement sensor is fixedly connected to the outer surface of the frame for monitoring the position of one end of the pin. A sliding rheostat is fixedly connected to the outer surface of the frame. The sliding end of the sliding rheostat interacts with one end of the pin and is used to connect in parallel when the wire harness temperature rises abnormally, so as to realize the functions of voltage reduction and current shunting.

[0007] Preferably, one end of the pin is fixedly connected to an insulating plate, the outer surface of the insulating plate is fixedly connected to the sliding end of the sliding rheostat, the outer surface of the insulating plate is fixedly connected to a plug rod, the outer surface of the plug rod is slidably connected to the inside of the housing, the outer surface of the plug rod is movably connected to a sleeve, and one end of the sleeve is fixedly connected to the outer surface of the frame.

[0008] Preferably, the cooling component includes a fan, a fixed frame is fixedly connected to the outer surface of the fan, the outer surface of the fixed frame is fixedly connected to the inside of the housing, fins are fixedly connected to the inside of the fixed frame, a semiconductor refrigeration chip is fixedly connected to the outer surface of the fixed frame, and the outer surface of the semiconductor refrigeration chip is fixedly connected to the main body of the housing through the fan.

[0009] Preferably, the exhaust port of the fan is connected to a hood, one end of the hood is connected to an air supply pipe, one end of the air supply pipe is connected to a blower pipe, and the air outlet of the blower pipe faces the wire harness.

[0010] Preferably, the stretching assembly includes two grooved plates, the outer surfaces of the two grooved plates are fixedly connected to the two sides inside the box body, the interior of each of the two grooved plates is slidably connected to a slider, the exterior of each of the two sliders is provided with a connecting plate, and the outer surface of the connecting plate is provided with an arc groove.

[0011] Preferably, the slider body is slidably connected to a slide rod, one end of the slide rod is fixedly connected to the inside of the housing, and a return spring is sleeved on the outside of the slide rod, with both ends of the return spring fixedly connected to the outer surfaces of the slide rod and the slider, respectively.

[0012] Preferably, a connecting rod is fixedly connected to the outer surface of the connecting plate, a pressure ring is fixedly connected to the outer surface of the connecting rod, a threaded sleeve is threaded to one end of the connecting rod, the threaded sleeve and the pressure ring clamp one end of the wire harness, a screw plate is fixedly connected to the outer surface of the threaded sleeve, a clamping tube is provided on the outside of the connecting plate, one end of the clamping tube is fixedly connected to the inside of the housing, and the outer surface of the screw plate is movably connected to the inside of the clamping tube.

[0013] Preferably, a safety unit is provided on the outside of the slider. The safety unit includes a fixed plate. The two sides of the outer surface of the fixed plate are fixedly connected to the outer surfaces of the slider and the connecting plate, respectively. An electromagnet is fixedly connected to the outer surface of the fixed plate. A magnetic cover is sleeved on the outside of the electromagnet. The outer surface of the magnetic cover is fixedly connected to the outer surface of the fixed plate. A magnetic block is movably connected to the electromagnet by magnetic force. The outer surface of the magnetic block is fixedly connected to the inside of the housing.

[0014] Preferably, the solid plate has an inner cavity, a battery is fixedly connected inside the inner cavity, a circuit board is fixedly connected inside the inner cavity, the input end of the circuit board is electrically connected to the battery and the output end of the connecting rod, and the output end of the circuit board is electrically connected to the input end of the electromagnet.

[0015] Beneficial effects This invention provides a high-current constant current source temperature rise testing device for new energy wiring harnesses. Compared with the prior art, it has the following advantages: (1) By setting up a temperature measuring mechanism, heat energy is used to heat the gas, thereby pushing the sealing plate and pin rod to move through the gas expansion. The position of the pin rod is monitored by the displacement sensor to obtain the temperature of the wire harness. At the same time, the higher the temperature of the wire harness, the more the sliding end of the sliding rheostat is pushed to slide, thereby increasing the resistance in its circuit and energizing it during the activity. The sliding rheostat reduces the voltage and shunts the wire harness, thereby avoiding the problems of melting, breakdown and ignition caused by excessive wire harness current, thus improving the safety during testing.

[0016] (2) By setting up a cooling component, when the wire harness temperature rises abnormally, the semiconductor cooling chip and the fan are powered on simultaneously. The two can provide low-temperature flowing air to cool the wire harness, thus avoiding the problem of the wire harness being ignited and damaged, as well as the problem of generating harmful gases causing harm. At the same time, by using the air hood, air supply pipe and air blowing pipe to guide the airflow, the cooling effect and efficiency of the low-temperature air are improved, thereby further avoiding the problem of the wire harness insulation layer being ignited.

[0017] (3) By setting up a tensioning component, the wire harness ends are wrapped around the connecting rod and pressed by the screw sleeve and the pressure ring, thereby enhancing the strength of the wire harness. The wire harness can be automatically stretched by the sliding of the slider, thereby improving the tension quality and efficiency of the wire harness. During the stretching process, the wire harness cannot be disassembled when the slider is not reset, thus avoiding the risk of disassembling the wire harness without timely power disconnection.

[0018] (4) By setting up a safety unit, the electrical connection between the circuit board and the wire harness circuit is utilized. When the wire harness circuit is powered on, the battery disconnects the power supply to the electromagnet, thereby allowing the magnetic block to maintain the stability of the slider position and keep the wire harness stretched by the magnetic attraction and magnetic cover. At the same time, the screw plate cannot be reset, so that the wire harness cannot be disassembled. When the wire harness circuit is powered off, the battery powers the electromagnet. Through the magnetic repulsion between the electromagnet and the magnetic block, the slider is reset to break free from the stretching of the wire harness, so that the wire harness can be disassembled. Thus, when the wire harness circuit is not powered off, the taut state of the wire harness serves as a warning, thereby improving the overall safety of the test. Attached Figure Description

[0019] Figure 1 This is a perspective view of the internal structure of the present invention; Figure 2 This is a perspective view of the external structure of the frame of the present invention; Figure 3 This is a perspective view of the external structure of the slider of the present invention; Figure 4 This is a perspective view of the internal structure of the fixed plate of the present invention; Figure 5 This is a perspective view of the external structure of the fan of the present invention.

[0020] In the diagram: 1. Housing; 2. Flat tube; 3. Cooling component; 31. Fan; 32. Fixed frame; 33. Fins; 34. Semiconductor cooling chip; 35. Fan shroud; 36. Air duct; 37. Air blowing duct; 4. Tensioning component; 41. Slotted plate; 42. Slider; 43. Safety unit; 431. Fixed plate; 432. Electromagnet; 433. Magnetic cover; 434. Magnetic block; 435. Inner cavity; 436. Storage battery; 437, circuit board; 44, connecting plate; 45, arc groove; 46, slide rod; 47, return spring; 48, connecting rod; 49, pressure ring; 410, screw sleeve; 411, screw plate; 412, clamping tube; 5, fixing frame; 6, arc plate; 7, sealing plate; 8, pin; 9, abutment spring; 10, displacement sensor; 11, sliding rheostat; 12, insulating plate; 13, insertion rod; 14, sleeve. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-5 This invention provides a technical solution: a high-current constant current source temperature rise testing device for new energy wiring harnesses. Example 1: Includes a housing 1. Inside the housing 1 is a high-current constant current source module providing a test circuit for the wire harness, and a display module for displaying test results. Inside the housing 1 is a temperature measuring mechanism, including a flat tube 2. A bracket 5 is fixedly connected to the outer surface of the flat tube 2, and the outer surface of the bracket 5 is fixedly connected to the interior of the housing 1. One end of the flat tube 2 is fixedly connected to an arc plate 6, the curvature of which matches the curvature of the wire harness, and the arc plate 6 is made of a material with good thermal conductivity. Inside the flat tube 2 is a slidingly connected sealing plate 7, made of a material with good heat corrosion resistance and sealing performance. The interior of the flat tube 2, located between the arc plate 6 and the sealing plate 7, is filled with active gas. A pin 8 is fixedly connected to the outer surface of the sealing plate 7. One end of the pin 8 is slidably connected to the body of the flat tube 2 and extends to the outside of the flat tube 2. A retaining spring 9 is sleeved on the outside of the pin 8. The retaining spring 9 facilitates the reset of the sealing plate 7 after movement by extending and retracting. The two ends of the retaining spring 9 are fixedly connected to the outer surface of the sealing plate 7 and the interior of the flat tube 2, respectively. A displacement sensor 10 is fixedly connected to the outer surface of the bracket 5. The displacement sensor 10 is electrically connected to an external control circuit and is used to monitor the position of the pin 8. For monitoring at one end, a sliding rheostat 11 is fixedly connected to the outer surface of the bracket 5. The sliding rheostat 11 is connected in parallel with the wire harness testing circuit to reduce voltage and shunt current in the wire harness circuit when abnormal temperature rise occurs during testing, thus preventing wire harness damage. The sliding end of the sliding rheostat 11 interacts with one end of the pin 8, used for parallel connection when the wire harness temperature rises abnormally, achieving voltage reduction and current shunt. An insulating plate 12 is fixedly connected to one end of the pin 8, serving as a connection support and insulation. The outer surface of the insulating plate 12 is fixedly connected to the sliding end of the sliding rheostat 11. A plug rod 13 is fixedly connected, which acts as a plug and is electrically connected to the wire harness test circuit. The outer surface of the plug rod 13 is slidably connected to the inside of the housing 1. A sleeve 14 is movably connected to the outer surface of the plug rod 13, which acts as a socket and is electrically connected to the sliding rheostat 11. The connection between the sleeve 14 and the frame 5 is insulated. As a preferred embodiment, the connection between the plug rod 13 and the sleeve 14 has a large contact range to facilitate the adjustment of the resistance value of the sliding rheostat 11, thereby adapting to changes in the wire harness temperature. One end of the sleeve 14 is fixedly connected to the outer surface of the frame 5.

[0023] In this embodiment, the wire harness is bundled with fastening straps and placed inside the housing 1. Both ends of the wire harness are electrically connected to the high-current constant current source module. Simultaneously, the arc plate 6 is tightly fitted to the surface of the wire harness. The high-current constant current source module then provides a constant high current to the wire harness for testing. When the wire harness heats up, heat is conducted through the arc plate 6 to heat the active gas inside the flat tube 2. This causes the active gas to expand, pushing the sealing plate 7 and the pin 8 to slide and compressing the abutment spring 9. Simultaneously, the displacement sensor 10, through the pin 8... The end position is monitored to obtain the current temperature value of the wire harness. At the same time, one end of the pin 8 drives the sliding end of the sliding rheostat 11 and the plug rod 13 to move synchronously through the insulating plate 12, thereby increasing the resistance of the sliding rheostat 11. When the wire harness temperature rises to a certain value, the plug rod 13 moves with the pin 8 and is inserted into the sleeve 14. The connection between the two makes the sliding rheostat 11 connect the circuit, so that the sliding rheostat 11 is connected in parallel with the wire harness to play a role in voltage reduction and current diversion, avoiding the problem of high current causing the wire harness to be damaged by high temperature.

[0024] Example 2: A cooling component 3 is installed on the outside of the flat tube 2 for cooling when the wire harness overheats abnormally. The cooling component 3 includes a fan 31, which drives the airflow in the housing 1 to cool and dissipate heat from the wire harness, preventing damage from high temperatures. A fixed frame 32 is fixedly connected to the outer surface of the fan 31, and the outer surface of the fixed frame 32 is fixedly connected to the inside of the housing 1. Fins 33 are fixedly connected to the inside of the fixed frame 32. Both the fins 33 and the fixed frame 32 are made of materials with good thermal conductivity, and the fins 33 can increase the heat dissipation area and efficiency. The fan 31, fixed frame 32, and fins 33 can be replaced by existing CPU heat sinks. A thermoelectric cooler 34 is fixedly connected to the outer surface of the fixed frame 32, and the cold end of the thermoelectric cooler 34 is fixedly connected to the fixed frame 32, which can cool the air inside the housing 1. The outer surface of the thermoelectric cooler 34 is fixedly connected to the body of the housing 1. The hot end of the thermoelectric cooler 34 is exposed to the outside of the housing 1 through the through-hole setting, and can be dissipated by external air cooling. The input ends of the thermoelectric cooler 34 and the fan 31 are electrically connected to the output end of the plug 13. In a preferred embodiment, the thermoelectric cooler 34 and the fan 31 are connected in series, and both are connected in parallel with the circuit of the sliding rheostat 11. The exhaust port of the fan 31 is connected to the shroud 35. One end of the shroud 35 is connected to the air supply pipe 36. One end of the air supply pipe 36 is connected to the air blowing pipe 37. The air blowing port of the air blowing pipe 37 faces downward toward the wire harness, so that the low temperature air is blown evenly toward the wire harness. In a preferred embodiment, the air blowing pipe 37 can be in the shape of a ring tube. By sleeved on the outside of the wire harness, more uniform cooling can be achieved. The air outlet of the air blowing pipe 37 faces the wire harness.

[0025] In this embodiment, when the wire harness temperature rises to a certain value, and when the plug 13 and sleeve 14 are plugged in, power is simultaneously supplied to the semiconductor cooling chip 34 and the fan 31. The circuit current is reduced by the parallel action of the sliding rheostat 11, preventing damage to both due to high current and high voltage. At the same time, the cold end of the semiconductor cooling chip 34 cools the solid frame 32 and fins 33, thereby cooling the air inside the housing 1. Then, the fan 31 drives the air inside the housing 1 to flow, and through the guiding effect of the fan shroud 35, air supply pipe 36 and blowing pipe 37, the low-temperature air is blown towards the wire harness to cool it down, thereby avoiding the problem of wire harness damage caused by high temperature.

[0026] Example 3: A tensioning assembly 4 is provided on the outside of the flat tube 2 for fixing both ends of the wire harness and for tensioning. The tensioning assembly 4 includes two slotted plates 41. The outer surfaces of the two slotted plates 41 are fixedly connected to the two sides inside the housing 1, respectively. A slider 42 is slidably connected inside each of the two slotted plates 41. The cross-section of the slider 42 is T-shaped to improve the stability of the connection with the slotted plates 41 and the force bearing capacity of the slider 42 itself. A connecting plate 44 is provided on the outside of each slider 42. The connecting plate 44 is made of a pressure-resistant, wear-resistant and insulating material. An arc groove 45 is opened on the outer surface of the connecting plate 44. The arc of the arc groove 45 is adapted to the arc of the wire harness to better place the wire harness and improve the lateral stability of the wire harness. A sliding rod 46 is slidably connected through the body of the slider 42. The sliding rod 46 guides the movement of the slider 42 and further improves the force bearing capacity of the slider 42. One end of the sliding rod 46 is fixedly connected to the inside of the housing 1. A return spring 47 is sleeved on the outside of the sliding rod 46. The spring-loaded return spring 47 facilitates the reset of the slider 42 after its movement. Both ends of the return spring 47 are fixedly connected to the slide rod 46 and the outer surface of the slider 42, respectively. A connecting rod 48 is fixedly connected to the outer surface of the connecting plate 44. The connecting rod 48 is made of conductive material and is electrically connected to the high-current constant current source module to supply power to the wiring harness and the plug 13. A pressure ring 49 is fixedly connected to the outer surface of the connecting rod 48. A threaded sleeve 410 is threaded to one end of the connecting rod 48. The clamping action of the threaded sleeve 410 and the pressure ring 49 can lift... The stability of the connection between the end of the wire harness and the connecting rod 48 is ensured by the screw sleeve 410 and the pressure ring 49 clamping one end of the wire harness. The outer surface of the screw sleeve 410 is fixedly connected to the screw plate 411, which is made of a pressure-resistant, wear-resistant and insulating material to facilitate screwing the screw sleeve 410. The connecting plate 44 is provided with a clamping tube 412 on the outside. One end of the clamping tube 412 is fixedly connected to the inside of the housing 1. The cross-section of the clamping tube 412 is C-shaped. The outer surface of the screw plate 411 is movably connected to the inside of the clamping tube 412.

[0027] In this embodiment, during testing, the wires at both ends of the harness are wound around the connecting rods 48 on both sides. Then, the screw sleeve 410 is screwed onto the connecting rod 48 by the screwing plate 411, so that the screw sleeve 410 is close to the pressure ring 49 to clamp the wire at the end of the harness. Then, the sliders 42 on both sides move in opposite directions inside the groove plate 41 and compress the return spring 47, thereby stretching the harness to make it taut. When the harness is taut, a part of it is placed inside the arc groove 45 to improve the stability of the harness. During the movement of the slider 42, the screwing plate 411 engages with the clamp tube 412 through the C port to improve the stability of the screw sleeve 410 and protect the end of the harness, preventing the end of the harness from being disassembled during testing, thereby avoiding the risk caused by disconnecting the wire to disconnect the high voltage power supply.

[0028] Example 4: A safety unit 43 is provided on the outside of the slider 42. The safety unit 43 includes a fixed plate 431. The two sides of the outer surface of the fixed plate 431 are fixedly connected to the outer surfaces of the slider 42 and the connecting plate 44, respectively. An electromagnet 432 is fixedly connected to the outer surface of the fixed plate 431. A magnetic cover 433 is sleeved on the outside of the electromagnet 432. The magnetic cover 433 is made of magnetic material, which can protect the electromagnet 432 and also drive the slider 42 and the connecting plate 44 to move through the magnetic attraction. The outer surface of the magnetic cover 433 is fixedly connected to the outer surface of the fixed plate 431. A magnetic block 434 is movably connected to the electromagnet 432 through magnetic force. The magnetic block 434 is made of permanent magnet and interacts with the electromagnet 432 through magnetic repulsion. The surface is fixedly connected to the interior of the housing 1. The interior of the fixed plate 431 has an inner cavity 435. As a preferred embodiment, the fixed plate 431 has through heat dissipation holes that communicate with the inner cavity 435 to provide a good heat dissipation environment for the battery 436 and the circuit board 437. The battery 436 is fixedly connected inside the inner cavity 435. The battery 436 can store electrical energy to power the electromagnet 432. The circuit board 437 is fixedly connected inside the inner cavity 435. The circuit board 437 is equipped with circuit components such as a rectifier circuit, a step-down circuit, and a magnetic switch. The input terminal of the circuit board 437 is electrically connected to the output terminal of the battery 436 and the connecting rod 48, respectively. The output terminal of the circuit board 437 is electrically connected to the input terminal of the electromagnet 432.

[0029] In this embodiment, when the wire harness is being tested, the circuit board 437 charges the battery 436 via the connecting rod 48. Simultaneously, a magnetic switch disconnects the circuit between the battery 436 and the electromagnet 432, allowing the magnetic block 434 to magnetically attract the magnetic cover 433. This causes the fixed plate 431 to move the slider 42 and the connecting plate 44 to stretch the wire harness. When the wire harness testing circuit is de-energized, the magnetic switch resets, and the battery 436 supplies power to the electromagnet 432 via the circuit board 437. Electromagnet 432 generates magnetism and interacts with magnetic block 434 through magnetic repulsion. Combined with the rebound action of reset spring 47, this causes fixed plate 431 and slider 42 to drive connecting plate 44 to move in the opposite direction and reset. At the same time, it causes screw plate 411 to disengage from clamp tube 412, and then screw sleeve 410 to be removed from connecting rod 48. This allows the wire at the end of the wire harness to be removed from connecting rod 48, ensuring that the wire harness can only be removed after it has been completely de-energized. This avoids the risk of high-voltage discharge and further improves the safety of the test.

[0030] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-current constant current source temperature rise testing device for new energy wiring harnesses, comprising a housing (1), characterized in that: The box (1) is equipped with a temperature measuring mechanism, which includes a flat tube (2). A cooling component (3) is provided on the outside of the flat tube (2) for cooling when the wire harness heats up abnormally. A tensioning component (4) is provided on the outside of the flat tube (2) for fixing the two ends of the wire harness and stretching it. A bracket (5) is fixedly connected to the outer surface of the flat tube (2). The outer surface of the bracket (5) is fixedly connected to the inside of the box (1). An arc plate (6) is fixedly connected to one end of the flat tube (2). A sealing plate (7) is slidably connected inside the flat tube (2). A pin (8) is fixedly connected to the outer surface of the sealing plate (7). One end of the pin (8) is slidably connected to the body of the flat tube (2) and extends to the outside of the flat tube (2). A retaining spring (9) is sleeved on the outside of the pin (8). The two ends of the retaining spring (9) are fixedly connected to the outer surface of the sealing plate (7) and the inside of the flat tube (2), respectively. A displacement sensor (10) is fixedly connected to the outer surface of the frame (5) for monitoring the position of one end of the pin (8). A sliding rheostat (11) is fixedly connected to the outer surface of the frame (5). The sliding end of the sliding rheostat (11) interacts with one end of the pin (8) for parallel connection when the wire harness temperature rises abnormally, so as to realize the functions of voltage reduction and current diversion.

2. The high-current constant current source temperature rise testing device for new energy wiring harnesses according to claim 1, characterized in that: An insulating plate (12) is fixedly connected to one end of the pin (8). The outer surface of the insulating plate (12) is fixedly connected to the sliding end of the sliding rheostat (11). A plug rod (13) is fixedly connected to the outer surface of the insulating plate (12). The outer surface of the plug rod (13) is slidably connected to the inside of the housing (1). A sleeve (14) is movably connected to the outer surface of the plug rod (13). One end of the sleeve (14) is fixedly connected to the outer surface of the frame (5).

3. The high-current constant current source temperature rise testing device for new energy wiring harnesses according to claim 1, characterized in that: The cooling component (3) includes a fan (31), a fixed frame (32) is fixedly connected to the outer surface of the fan (31), the outer surface of the fixed frame (32) is fixedly connected to the inside of the housing (1), a fin (33) is fixedly connected to the inside of the fixed frame (32), a semiconductor cooling chip (34) is fixedly connected to the outer surface of the fixed frame (32), and the outer surface of the semiconductor cooling chip (34) is fixedly connected to the body of the housing (1).

4. The high-current constant current source temperature rise testing device for new energy wiring harnesses according to claim 3, characterized in that: The exhaust port of the fan (31) is connected to a hood (35), one end of the hood (35) is connected to an air supply pipe (36), one end of the air supply pipe (36) is connected to a blower pipe (37), and the air outlet of the blower pipe (37) faces the wire harness.

5. The high-current constant current source temperature rise testing device for new energy wiring harnesses according to claim 1, characterized in that: The stretching assembly (4) includes two groove plates (41). The outer surfaces of the two groove plates (41) are fixedly connected to the two sides inside the box body (1). The interior of each of the two groove plates (41) is slidably connected to a slider (42). The exterior of each of the two sliders (42) is provided with a connecting plate (44). The outer surface of the connecting plate (44) is provided with an arc groove (45).

6. The high-current constant current source temperature rise testing device for new energy wiring harnesses according to claim 5, characterized in that: The body of the slider (42) is slidably connected to a slide rod (46). One end of the slide rod (46) is fixedly connected to the inside of the box (1). A return spring (47) is sleeved on the outside of the slide rod (46). The two ends of the return spring (47) are fixedly connected to the outer surfaces of the slide rod (46) and the slider (42), respectively.

7. The high-current constant current source temperature rise testing device for new energy wiring harnesses according to claim 5, characterized in that: A connecting rod (48) is fixedly connected to the outer surface of the connecting plate (44), and a pressure ring (49) is fixedly connected to the outer surface of the connecting rod (48). A threaded sleeve (410) is threaded to one end of the connecting rod (48). The threaded sleeve (410) and the pressure ring (49) clamp one end of the wire harness. A screw plate (411) is fixedly connected to the outer surface of the threaded sleeve (410). A clamping tube (412) is provided on the outside of the connecting plate (44). One end of the clamping tube (412) is fixedly connected to the inside of the housing (1). The outer surface of the screw plate (411) is movably connected to the inside of the clamping tube (412).

8. The high-current constant current source temperature rise testing device for new energy wiring harnesses according to claim 5, characterized in that: The slider (42) is provided with a safety unit (43) on its outside. The safety unit (43) includes a fixed plate (431). The two sides of the outer surface of the fixed plate (431) are fixedly connected to the outer surfaces of the slider (42) and the connecting plate (44), respectively. An electromagnet (432) is fixedly connected to the outer surface of the fixed plate (431). A magnetic cover (433) is sleeved on the outside of the electromagnet (432). The outer surface of the magnetic cover (433) is fixedly connected to the outer surface of the fixed plate (431). The electromagnet (432) is movably connected to a magnetic block (434) by magnetic force. The outer surface of the magnetic block (434) is fixedly connected to the inside of the housing (1).

9. The high-current constant current source temperature rise testing device for new energy wiring harnesses according to claim 8, characterized in that: The solid plate (431) has an inner cavity (435) inside, and a storage battery (436) is fixedly connected inside the inner cavity (435). A circuit board (437) is fixedly connected inside the inner cavity (435). The input end of the circuit board (437) is electrically connected to the output end of the storage battery (436) and the connecting rod (48), respectively. The output end of the circuit board (437) is electrically connected to the input end of the electromagnet (432).

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