Thermal extension automatic detection device for cable

Abstract

The invention relates to the technical field of cable detection, and discloses a cable thermal extension automatic detection device which comprises a test box body, an upper cable clamp is fixedly connected to the top end in the test box body, a to-be-detected cable is fixedly connected to the bottom end of the upper cable clamp, and a lower cable clamp is fixedly connected to the bottom end of the to-be-detected cable. The bottom end of the lower cable clamp is fixedly connected with a weight pan, the bottom end of the weight pan is provided with a fixing mechanism, the side surface of the weight pan is provided with a loading mechanism, and the side surface of the loading mechanism is provided with a supply mechanism; an output motor is started and drives an output gear to rotate through an output shaft, the output gear drives a transmission gear to rotate when rotating, the transmission gear starts a rotating shaft in the transmission gear to rotate, then a lifting block drives the rotating shaft to move upwards and towards the center, a weight disc is fixed after three fixing plates move, and the weight disc is more stable during loading; and after loading, the fixed plate moves downwards to avoid the position, so that the influence of the fixed plate on detection and conveying of the test weight is avoided.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, and more specifically to an automatic testing device for thermal elongation of cables. Background Technology

[0002] A cable is an electrical or signal transmission device, usually composed of several or several groups of conductors. Wires and cables are wire products used to transmit electrical energy, information and realize electromagnetic energy conversion. Before leaving the factory, cables need to be tested for thermal elongation deformation. Cable thermal elongation testing is mainly used to evaluate the material's ability to resist heat deformation under high temperature and mechanical stress, to ensure the safety and reliability of the cable. When cables undergo thermal elongation testing, the elongation and permanent deformation of polymer materials such as insulation and sheath are tested by simulating high-temperature environments and load conditions to ensure that the materials meet production standards or certification requirements. In the cable production process, thermal elongation testing is a core link in quality control, involving batch testing of low-voltage, high-voltage and special cables. The test results directly affect the engineering acceptance of cables in the fields of power, construction, and rail transportation. If the thermal elongation performance does not meet the standards, it may lead to safety hazards such as insulation failure and short circuits. When performing thermal elongation performance testing, when the weights are loaded into the weight pan, the weights will exert a large impact force on the weight pan the moment they fall onto the weight pan. At this time, the cable will be subjected to a large impact, which will damage the cable and cause errors in the subsequent thermal elongation test results. Nowadays, when performing thermal extension testing, the testing equipment needs to be frequently switched on and off to complete the loading process. After switching the equipment on and off, the inside of the equipment needs to be reheated and kept warm to ensure the testing accuracy. However, the heating and warming process increases the overall testing time and reduces the testing effect. The current testing process requires multiple loading of weights, but since it cannot be automated, the testing process is quite cumbersome. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide an automatic detection device for thermal elongation of cables to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an automatic thermal elongation testing device for cables, comprising a test chamber with a sealing door movably connected to the side of the test chamber, an upper cable clamp fixedly connected to the top of the interior of the test chamber, a cable to be tested fixedly connected to the bottom of the upper cable clamp, a lower cable clamp fixedly connected to the bottom of the cable to be tested, a weight pan fixedly connected to the bottom of the lower cable clamp, a fixing mechanism provided at the bottom of the weight pan, a loading mechanism provided on the side of the weight pan, a supply mechanism provided on the side of the loading mechanism, and test weights placed above the loading mechanism and the supply mechanism; The fixing mechanism includes an output motor that provides power. An output shaft is fixedly connected to the top of the output motor. An output gear is fixedly connected to the side of the output shaft. Three transmission gears distributed at equal angles mesh with the side of the output gear. A rotating shaft is fixedly connected inside the transmission gear. A lifting block is threadedly connected to the top of the side of the rotating shaft. A fixing plate is fixedly connected to the side of the lifting block. The side of the fixing plate is perpendicular to the horizontal direction.

[0005] In a preferred embodiment, both the sealed door and the side of the test chamber are provided with heat-insulated observation windows. A first detector is fixedly connected to the side of the observation window inside the sealed door, and a second detector is fixedly connected to the side of the observation window inside the test chamber.

[0006] In a preferred embodiment, a heat insulation plate is movably connected to the bottom end of the side of the output shaft, the heat insulation plate isolates the output motor, a fixed plate is movably connected to the side of the output shaft, the bottom end of the fixed plate is fixedly connected to the bottom end of the interior of the test chamber, and the rotating shaft rotates inside the fixed plate.

[0007] In a preferred embodiment, limit rings are fixedly connected to the bottom ends of both sides of the lifting block, and limit rods are movably connected inside the limit rings. A lower limit plate is fixedly connected to the middle of the side of the limit rod, and an upper limit plate is fixedly connected to the top of the limit rod. The limit rings are located between the lower limit plate and the limit rod, and the bottom end of the limit rod is fixedly connected to the top end of the fixed plate.

[0008] In a preferred embodiment, the loading mechanism includes a servo motor that can provide power, a threaded rod fixedly connected to the side of the servo motor, a movable block threadedly connected to the side of the threaded rod, a support rod fixedly connected to the top of the movable block, a connecting plate fixedly connected to the top of the support rod, a first ejection assembly fixedly connected to the top of the connecting plate, and the test weight placed above the connecting plate.

[0009] In a preferred embodiment, a support rod is movably connected to the bottom of the moving block. The support rod is located inside the test chamber and is fixedly connected to the test chamber. The servo motor is located outside the test chamber, and the connecting plate is located above the weight pan.

[0010] In a preferred embodiment, the first ejection assembly includes a fixing box for fixing, an electromagnet is fixedly connected to the side of the fixing box away from the test weight, a magnetic plate is provided on the side of the electromagnet near the threaded rod, a connecting block is fixedly connected to the side of the magnetic plate away from the electromagnet, and a top plate is fixedly connected to the side of the connecting block away from the magnetic plate.

[0011] In a preferred embodiment, a fixing rod is movably connected inside the magnetic plate. The two ends of the fixing rod are fixedly connected to the side of the fixing box and the side of the electromagnet, respectively. Limiting blocks are movably connected to both sides of the bottom end of the top plate. The test weight is located between the two limiting blocks. The bottom end of the limiting block is fixedly connected to the top end of the connecting plate.

[0012] In a preferred embodiment, the supply mechanism includes a support plate for support, and a second ejection component is fixedly connected to the top of the support plate. The second ejection component has the same structure as the first ejection component, and the side of the support plate is in contact with the side of the connecting plate.

[0013] The technical effects and advantages of this invention are as follows: 1. This invention comprises an output motor, an output gear, a transmission gear, and fixed plates. When loading is required, the output motor starts and drives the output gear to rotate through the output shaft. When the output gear rotates, it drives the transmission gear to rotate. The transmission gear starts its internal rotating shaft to rotate, which in turn causes the lifting block to move the rotating shaft upward and towards the center. After the three fixed plates move, they fix the weight pan, making it more stable during loading. After loading, the fixed plates move downward to avoid affecting the detection and transportation of the test weights. 2. The present invention is equipped with a servo motor, a moving block, a connecting plate, and a first ejector assembly. When the test weight is loaded, the servo motor starts and drives the threaded rod to rotate. When the threaded rod rotates, the moving block drives the connecting plate and the first ejector assembly to move. When the first ejector assembly moves above the weight pan, the electromagnet is energized and generates a magnetic repulsion force between it and the magnetic plate. Under the action of the magnetic repulsion force, the magnetic plate drives the top plate to move through the connecting block, thereby pushing the test weight above the connecting plate into the test chamber and automatically completing the loading work. 3. This invention, by providing a support plate and a second ejector component, allows for the loading of multiple test weights. When multiple test weights need to be loaded, the first ejector component moves to the side of the support plate, at which point the second ejector component operates, pushing the test weights on the support plate onto the connecting plate. After the connecting plate delivers the test weights into the weight pan, it moves to the side of another support plate, thus automatically supplying the next test weight. This allows for the loading of multiple test weights. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the present invention without a sealing door.

[0016] Figure 3 This is a schematic diagram of the internal structure of the test chamber of the present invention.

[0017] Figure 4 This is a schematic diagram of the structure when loading test weights according to the present invention.

[0018] Figure 5 This is a schematic diagram of the overall structure of the fixing mechanism of the present invention.

[0019] Figure 6 This is an exploded structural diagram of the fixing mechanism of the present invention.

[0020] Figure 7 This is a schematic diagram of the loading mechanism structure of the present invention.

[0021] Figure 8 This is a schematic diagram of the first ejection component structure of the present invention.

[0022] Figure 9 This is a schematic diagram of the supply mechanism structure of the present invention.

[0023] The attached diagram is labeled as follows: 1. Test chamber; 2. Sealed door; 3. Upper cable clamp; 4. Cable to be tested; 5. Lower cable clamp; 6. Weight pan; 7. Fixing mechanism; 701. Output motor; 702. Output shaft; 703. Output gear; 704. Transmission gear; 705. Rotating shaft; 706. Lifting block; 707. Fixing plate; 708. Heat insulation plate; 709. Fixing disc; 710. Limiting ring; 711. Limiting rod; 712. Lower limit plate; 713. Upper limit plate; 8. Loader 801. Servo motor; 802. Threaded rod; 803. Moving block; 804. Support rod; 805. Connecting plate; 806. First ejection assembly; 8061. Fixing box; 8062. Electromagnet; 8063. Magnetic plate; 8064. Connecting block; 8065. Top plate; 8066. Fixing rod; 8067. Limiting block; 9. Supply mechanism; 901. Support plate; 902. Second ejection assembly; 10. First detector; 11. Second detector; 12. Test weight. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The automatic detection device for thermal elongation of cables involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Reference Figure 1 , Figure 2 , Figure 3 as well as Figure 7 This invention provides an automatic thermal elongation testing device for cables, comprising a test chamber 1, a sealing door 2 movably connected to the side of the test chamber 1, an upper cable clamp 3 fixedly connected to the top of the interior of the test chamber 1, a cable 4 to be tested fixedly connected to the bottom of the upper cable clamp 3, a lower cable clamp 5 fixedly connected to the bottom of the cable 4 to be tested, a weight pan 6 fixedly connected to the bottom of the lower cable clamp 5, a fixing mechanism 7 provided at the bottom of the weight pan 6, a loading mechanism 8 provided on the side of the weight pan 6, a supply mechanism 9 provided on the side of the loading mechanism 8, and test weights 12 placed above the loading mechanism 8 and the supply mechanism 9. Both the sealing door 2 and the side of the test chamber 1 have heat-insulated observation windows. A first detector 10 is fixedly connected to the side of the observation window inside the sealing door 2, and a second detector 11 is fixedly connected to the side of the observation window inside the test chamber 1.

[0026] In this embodiment, the first detector 10 and the second detector 11 are observed from the side of the test chamber 1 and the side of the sealing door 2, respectively, so that the thermal extension change of the cable 4 under test can be observed from different angles, thereby ensuring the accuracy of the test. The fixing mechanism 7 is located below the weight pan 6, and the fixing mechanism 7 will not cause visual obstruction to the first detector 10 and the second detector 11 when they are performing the test, thereby ensuring the accuracy of the test.

[0027] Reference Figure 4 , Figure 5 as well as Figure 6 The fixing mechanism 7 includes an output motor 701 that provides power. An output shaft 702 is fixedly connected to the top of the output motor 701. An output gear 703 is fixedly connected to the side of the output shaft 702. Three transmission gears 704, evenly distributed at angles, mesh with the side of the output gear 703. A rotating shaft 705 is fixedly connected inside the transmission gears 704. A lifting block 706 is threadedly connected to the top of the side of the rotating shaft 705. A fixing plate 707 is fixedly connected to the side of the lifting block 706. The side of the fixing plate 707 is perpendicular to the horizontal direction. A heat insulation plate 708 is movably connected to the bottom of the side of the output shaft 702, and the heat insulation plate 708 isolates the output shaft from the power source. The motor 701 has a fixed plate 709 movably connected to the side of the output shaft 702. The bottom end of the fixed plate 709 is fixedly connected to the bottom end inside the test chamber 1. The rotating shaft 705 rotates inside the fixed plate 709. Limiting rings 710 are fixedly connected to the bottom ends of both sides of the lifting block 706. Limiting rods 711 are movably connected inside the limiting rings 710. A lower limiting plate 712 is fixedly connected to the middle of the side of the limiting rod 711. An upper limiting plate 713 is fixedly connected to the top of the limiting rod 711. The limiting ring 710 is located between the lower limiting plate 712 and the limiting rod 711. The bottom end of the limiting rod 711 is fixedly connected to the top end of the fixed plate 709.

[0028] In this embodiment, after the output motor 701 starts, it drives the output gear 703 to rotate via the output shaft 702. When the output gear 703 rotates, it drives the three transmission gears 704 on its side to rotate. When the transmission gears 704 rotate, they drive the rotating shaft 705 to rotate, thereby causing the lifting block 706 to move the fixing plate 707 upward and towards the center. When the three fixing plates 707 move upward and towards the center to the side of the weight pan 6, the position of the weight pan 6 is fixed. At this time, when loading, the cable 4 to be tested will not be subjected to a large impact force. Furthermore, the lifting block 706 and the fixing plate 707 move obliquely upward or downward. When no fixing is required, the lifting block 706 and the fixing plate 707 will move downward. Therefore, it will not affect the detection of the first detector 10 and the second detector 11, and it is convenient to remove the cable 4 to be tested after the heat extension test. The heat insulation plate 708 isolates the heat received by the output motor 701 to prevent it from being damaged. When the lifting block 706 moves up and down, the limiting ring 710 moves on the side of the limiting rod 711 to achieve the limiting effect. When the limiting ring 710 moves, it moves between the limiting rod 711 and the lower limiting plate 712 to prevent the lifting block 706 from moving upward and disengaging from the rotating shaft 705, and from moving downward and contacting the transmission gear 704 and being damaged. The three fixing plates 707 move synchronously towards the center to achieve the effect of fixing and centering, ensuring the stability of the weight pan 6.

[0029] Reference Figure 7 The loading mechanism 8 includes a servo motor 801 that provides power. A threaded rod 802 is fixedly connected to the side of the servo motor 801. A moving block 803 is threadedly connected to the side of the threaded rod 802. A support rod 804 is fixedly connected to the top of the moving block 803. A connecting plate 805 is fixedly connected to the top of the support rod 804. A first ejection assembly 806 is fixedly connected to the top of the connecting plate 805. The test weight 12 is placed above the connecting plate 805. The support rod 804 is movably connected to the bottom of the moving block 803. The support rod 804 is located inside the test chamber 1 and is fixedly connected to the test chamber 1. The servo motor 801 is located outside the test chamber 1. The connecting plate 805 is located above the weight pan 6.

[0030] In this embodiment, the servo motor 801 starts and drives the threaded rod 802 to rotate. When the threaded rod 802 rotates, the moving block 803 moves. The moving block 803 drives the connecting plate 805 and the first ejector component 806 to move above the weight pan 6. Since the connecting plate 805 is located above the weight pan 6, when the test weight 12 is pushed down, it will fall into the weight pan 6 and automatically complete the loading work. When the moving block 803 moves, it is limited by the support rod 804 to ensure the stability of the moving block 803 when it drives the connecting plate 805 and the first ejector component 806 to move.

[0031] Reference Figure 8 The first ejection assembly 806 includes a fixing box 8061 for fixing. An electromagnet 8062 is fixedly connected to the side of the fixing box 8061 away from the test weight 12. A magnetic plate 8063 is provided on the side of the electromagnet 8062 near the threaded rod 802. A connecting block 8064 is fixedly connected to the side of the magnetic plate 8063 away from the electromagnet 8062. A top plate 8065 is fixedly connected to the side of the connecting block 8064 away from the magnetic plate 8063. A fixing rod 8066 is movably connected inside the magnetic plate 8063. The two ends of the fixing rod 8066 are fixedly connected to the side of the fixing box 8061 and the side of the electromagnet 8062, respectively. Limiting blocks 8067 are movably connected to both sides of the bottom end of the top plate 8065. The test weight 12 is located between the two limiting blocks 8067. The bottom end of the limiting block 8067 is fixedly connected to the top end of the connecting plate 805.

[0032] In this embodiment, when the electromagnet 8062 is energized in the forward direction, a magnetic repulsion force is generated between it and the magnetic plate 8063. Under the action of the magnetic repulsion force, the magnetic plate 8063 drives the top plate 8065 to move through the connecting block 8064. When the top plate 8065 moves, it pushes the test weight 12 on the connecting plate 805 into the weight pan 6, automatically completing the loading work. When the electromagnet 8062 is energized in the reverse direction, there is a magnetic attraction between the electromagnet 8062 and the magnetic plate 8063. Under the action of the magnetic attraction force, the magnetic plate 8063 moves closer to the electromagnet 8062, so that the top plate 8065 is pressed against the fixed box 8061. At this time, the next test weight 12 can be transported. The test weight 12 is located between two limiting blocks 8067, which limit the test weight 12 to prevent it from slipping and make it more stable when receiving the test weight 12 from the second ejection component 902.

[0033] Reference Figure 9 The supply mechanism 9 includes a support plate 901 for support. A second ejection component 902 is fixedly connected to the top of the support plate 901. The second ejection component 902 has the same structure as the first ejection component 806, and the side of the support plate 901 is in contact with the side of the connecting plate 805.

[0034] In this embodiment, the second ejection component 902 has the same structure as the first ejection component 806. Therefore, the second ejection component 902 can push the test weight 12 above the support plate 901 into the connecting plate 805 for automatic collection. There are multiple support plates 901 and multiple second ejection components 902. The test weight 12 on each support plate 901 has a different weight, which facilitates accurate thermal expansion detection. The side of the support plate 901 is in contact with the side of the connecting plate 805, which facilitates the movement of the test weight 12. After the thermal expansion detection, the test weight 12 can be sent back to the top of the support plate 901 through the connecting plate 805 and the first ejection component 806 for re-testing the thermal expansion. In addition, it should be noted that the electromagnet 8062 and the magnetic plate 8063 are both made of high-temperature resistant material. This is a prior art in the field. This application does not limit the material in detail, as long as it can work in the test chamber 1.

[0035] The working principle of this invention is as follows: Before the test, the cable 4 to be tested is fixed by the upper cable clamp 3 and the lower cable clamp 5. After fixing, the sealing door 2 is closed. At this time, the inside of the test chamber 1 is in a fixed state. The test chamber 1 is heated. When it reaches the preset temperature and is kept warm, the servo motor 801 is started and drives the threaded rod 802 to rotate. When the threaded rod 802 rotates, the moving block 803 moves. The moving block 803 drives the connecting plate 805 and the first ejection component 806 to move to the side of the support plate 901. Then, the second ejection component 902 is started to push the test weight 12 on the support plate 901 onto the connecting plate 805. When the test weight 12 is mounted on the connecting plate 805, the servo motor 801 starts again and moves the connecting plate 805 above the weight pan 6. When the connecting plate 805 moves above the weight pan 6, the output motor 701 starts and drives the output shaft 702 to rotate. When the output shaft 702 rotates, it drives the output gear 703 to rotate. When the output gear 703 rotates, it drives the three transmission gears 704 on its side to rotate. When the transmission gears 704 rotate, they drive the rotating shaft 705 to rotate, which in turn causes the lifting block 706 to move the fixing plate 707 upward and towards the center. When the three fixing plates 707 move upward and towards the center to the side of the weight pan 6, the position of the weight pan 6 is fixed. After the position of the weight pan 6 is fixed, the electromagnet 8062 is energized in the forward direction and generates a magnetic repulsion force between it and the magnetic plate 8063. Under the action of the magnetic repulsion force, the magnetic plate 8063 drives the top plate 8065 to move through the connecting block 8064. When the top plate 8065 moves, it pushes the test weight 12 on the connecting plate 805 into the weight pan 6, automatically completing the loading work. After the loading work is completed, the electromagnet 8062 is energized in the reverse direction. At this time, there is a magnetic attraction force between the electromagnet 8062 and the magnetic plate 8063. Under the action of the magnetic attraction force, the magnetic plate 8063 moves closer to the electromagnet 8062, thereby making the top plate 8065 stick tightly to the fixed box 8061. After the fixed box 8061 is pressed against the top plate 8065, the servo motor 801 controls the threaded rod 802 to rotate again, sending the connecting plate 805 and the first ejector component 806 to the side of the other support plate 901. The second ejector component 902 pushes another test weight 12 above the connecting plate 805. When the next test weight 12 needs to be loaded, the loading work can be carried out automatically. After the test weight 12 is placed inside the weight pan 6, the output motor 701 controls the output shaft 702 to reverse, thereby causing the fixed plate 707 to move downward and outward, releasing the weight pan 6. At this time, the lifting block 706 and the fixed plate 707 are located below the weight pan 6. The thermal extension change of the cable 4 under test can be observed synchronously in different directions through the first detector 10 and the second detector 11.

[0036] In conclusion, the above are merely preferred embodiments of the present invention and are 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. An automatic detection device for thermal elongation of cables, comprising a test chamber (1), characterized in that: The test chamber (1) is movably connected to a sealing door (2) on its side. An upper cable clamp (3) is fixedly connected to the top of the test chamber (1). A cable to be tested (4) is fixedly connected to the bottom of the upper cable clamp (3). A lower cable clamp (5) is fixedly connected to the bottom of the cable to be tested (4). A weight pan (6) is fixedly connected to the bottom of the lower cable clamp (5). A fixing mechanism (7) is provided at the bottom of the weight pan (6). A loading mechanism (8) is provided on the side of the weight pan (6). A supply mechanism (9) is provided on the side of the loading mechanism (8). Test weights (12) are placed above the loading mechanism (8) and the supply mechanism (9). The fixing mechanism (7) includes an output motor (701) that provides power. An output shaft (702) is fixedly connected to the top of the output motor (701). An output gear (703) is fixedly connected to the side of the output shaft (702). Three transmission gears (704) distributed at equal angles mesh on the side of the output gear (703). A rotating shaft (705) is fixedly connected inside the transmission gear (704). A lifting block (706) is threadedly connected to the top of the side of the rotating shaft (705). A fixing plate (707) is fixedly connected to the side of the lifting block (706). The side of the fixing plate (707) is perpendicular to the horizontal direction.

2. The automatic detection device for thermal elongation of cables according to claim 1, characterized in that: Both the sealed door (2) and the test chamber (1) have heat-insulating observation windows on their sides. A first detector (10) is fixedly connected to the side of the observation window inside the sealed door (2), and a second detector (11) is fixedly connected to the side of the observation window inside the test chamber (1).

3. The automatic detection device for thermal elongation of cables according to claim 1, characterized in that: A heat insulation plate (708) is movably connected to the bottom end of the side of the output shaft (702). The heat insulation plate (708) isolates the output motor (701). A fixed plate (709) is movably connected to the side of the output shaft (702). The bottom end of the fixed plate (709) is fixedly connected to the bottom end inside the test chamber (1). The rotating shaft (705) rotates inside the fixed plate (709).

4. The automatic detection device for thermal elongation of cables according to claim 3, characterized in that: Limiting rings (710) are fixedly connected to the bottom ends of both sides of the lifting block (706). A limiting rod (711) is movably connected inside the limiting ring (710). A lower limiting plate (712) is fixedly connected to the middle of the side of the limiting rod (711). An upper limiting plate (713) is fixedly connected to the top of the limiting rod (711). The limiting ring (710) is located between the lower limiting plate (712) and the limiting rod (711). The bottom end of the limiting rod (711) is fixedly connected to the top end of the fixed plate (709).

5. The automatic detection device for thermal elongation of cables according to claim 1, characterized in that: The loading mechanism (8) includes a servo motor (801) that can provide power. A threaded rod (802) is fixedly connected to the side of the servo motor (801). A moving block (803) is threadedly connected to the side of the threaded rod (802). A support rod (804) is fixedly connected to the top of the moving block (803). A connecting plate (805) is fixedly connected to the top of the support rod (804). A first ejection assembly (806) is fixedly connected to the top of the connecting plate (805). The test weight (12) is placed above the connecting plate (805).

6. The automatic detection device for thermal elongation of cables according to claim 5, characterized in that: The bottom of the moving block (803) is movably connected to a support rod (804). The support rod (804) is located inside the test chamber (1) and is fixedly connected to the test chamber (1). The servo motor (801) is located outside the test chamber (1). The connecting plate (805) is located above the weight pan (6).

7. The automatic detection device for thermal elongation of cables according to claim 6, characterized in that: The first ejection assembly (806) includes a fixing box (8061) for fixing. An electromagnet (8062) is fixedly connected to the side of the fixing box (8061) away from the test weight (12). A magnetic plate (8063) is provided on the side of the electromagnet (8062) near the threaded rod (802). A connecting block (8064) is fixedly connected to the side of the magnetic plate (8063) away from the electromagnet (8062). A top plate (8065) ​​is fixedly connected to the side of the connecting block (8064) away from the magnetic plate (8063).

8. The automatic detection device for thermal elongation of cables according to claim 7, characterized in that: The magnetic plate (8063) is internally connected to a fixed rod (8066), and the two ends of the fixed rod (8066) are fixedly connected to the side of the fixed box (8061) and the side of the electromagnet (8062), respectively. Limiting blocks (8067) are movably connected to both sides of the bottom end of the top plate (8065). The test weight (12) is located between the two limiting blocks (8067). The bottom end of the limiting block (8067) is fixedly connected to the top end of the connecting plate (805).

9. The automatic detection device for thermal elongation of cables according to claim 1, characterized in that: The supply mechanism (9) includes a support plate (901) for support, and a second ejection assembly (902) is fixedly connected to the top of the support plate (901). The second ejection assembly (902) has the same structure as the first ejection assembly (806), and the side of the support plate (901) is in contact with the side of the connecting plate (805).

Images