A heating tube fatigue testing device

Abstract

The present application relates to the technical field of heating tube production, and particularly relates to a heating tube fatigue testing device, which comprises a machine table, a transfer mechanism installed on the machine table, a test water tank installed above the machine table, a mounting plate arranged on a sliding seat of the transfer mechanism, a clamping mechanism arranged below the mounting plate, a driving mechanism arranged on the upper side of the mounting plate and used for driving the clamping mechanism to move, and an induction control assembly arranged below the mounting plate and arranged opposite to the clamping mechanism. The present application realizes automatic transfer of the heating tube between the test water tank and a cold area through cooperation of the transfer mechanism and the clamping mechanism, and manual intervention is not needed, so that the labor intensity is significantly reduced. The induction control assembly is used for monitoring the temperature in real time, and heating is stopped when the threshold value is reached, so that the uniformity of the fatigue testing conditions and the accuracy of the testing data are ensured.

Description

Technical Field

[0001] This invention relates to the field of heating element manufacturing technology, and in particular to a heating element fatigue testing device. Background Technology

[0002] As the core component of various electric heating devices, the service life and reliability of heating elements directly affect the safety and performance of the entire device. In the research and development and production of heating elements, fatigue testing is an essential and critical step. By simulating the working state of heating elements under alternating hot and cold environments, their thermal shock resistance and structural stability can be evaluated.

[0003] However, traditional testing methods typically rely on manual operation. Testers must manually place the heating element in a water tank to heat it, and then manually remove it and immerse it in cooling water for rapid cooling after the set time or temperature is reached. This method is not only labor-intensive and time-consuming, but also makes it difficult to guarantee consistency in each test. Human error can easily lead to differences in heating and cooling times, as well as the immersion depth of the element, thus affecting the authenticity and comparability of the test data. Furthermore, existing testing devices lack precise temperature sensing and control mechanisms, often relying on fixed time intervals to control the heating process. They cannot provide real-time feedback and adjustment based on the actual temperature at the end of the heating element, resulting in less stringent testing conditions and affecting the accuracy of fatigue test results.

[0004] Therefore, in order to further improve the testing stability and reliability of heating tubes, we propose a heating tube fatigue testing device. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as high labor intensity, time and effort consumption, and difficulty in ensuring consistency in each test, by proposing a heating tube fatigue testing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: Design a fatigue testing device for heating tubes, including: The machine base and the transfer mechanism mounted on the machine base; A test water tank is also installed above the machine. A mounting plate is provided on the slide of the transfer mechanism. A clamping mechanism is provided below the mounting plate. A drive mechanism for driving the clamping mechanism to move is provided on the upper side of the mounting plate. A sensing control component is also provided below the mounting plate, and the sensing control component and the clamping mechanism are arranged opposite to each other.

[0007] Furthermore, the clamping mechanism includes; A clamping base is fixedly installed on the lower side of the mounting plate; Three guide grooves are provided on the end face of the clamping base. A guide shaft is slidably connected inside the guide groove. A clamping roller is fixedly installed on the lower side of the mounting plate.

[0008] Furthermore, the drive mechanism includes; Cylinders mounted on the mounting plate; A slide is fixedly mounted on the shaft end of the cylinder, and a first rack is provided on one side of the slide. A rotating shaft is rotatably connected to the middle of the mounting plate, and a first gear is fixedly mounted on the upper end of the rotating shaft. The first gear and the first rack mesh and transmit power.

[0009] Furthermore, a synchronization disc is fixedly installed at the lower end of the rotating shaft, and three connecting rods are pinned to the end face of the synchronization disc. The other end of the connecting rods is rotatably connected to the guide shaft.

[0010] Furthermore, the cylinder and the mounting plate are slidably connected, a compression spring is fixedly connected between the cylinder and the mounting plate, a stop block that stops the first rack is fixedly installed at the front end of the mounting plate, and a control mechanism is also provided between the cylinder and the sensing control component.

[0011] Furthermore, the sensing control component includes; A transfer plate is slidably connected to the underside of the mounting plate; A support base is fixedly installed on the end face of the transfer plate, and a movable rod is movably inserted into the end face of the support base. A spring is fixedly connected between the movable rod and the support base, and a temperature sensing element is also provided at the end of the movable rod.

[0012] Furthermore, a connecting ring is fixedly installed on the outer side of the movable rod, and a heat-conducting block and a temperature-sensing element are fixedly installed on the upper and lower sides of the connecting ring, respectively. The heat-conducting block is sleeved on the outer side of the temperature-sensing element, and two conductive contacts are provided on the end face of the heat-conducting block. The temperature-sensing element and the two conductive contacts are electrically connected.

[0013] Furthermore, a counting plate is also fixedly installed on the back end of the connecting ring; The temperature sensing element is a bimetallic strip, and two counting contacts are also provided on the end face of the counting plate. After the temperature sensing element is deformed, it comes into contact with the two counting contacts. The end of the movable rod is also provided with a push switch, and the contact of the push switch passes through the temperature sensing element and the heat-conducting block.

[0014] Furthermore, the control mechanism includes; Rotary connection of the synchronous shaft to the mounting plate; The upper and lower ends of the synchronous shaft are respectively fixedly installed with a second gear and a third gear. The cylinder and the transfer plate are respectively installed with a second rack and a third rack. The second rack and the second gear mesh for transmission, and the third rack and the third gear mesh for transmission.

[0015] Furthermore, the test water tank is connected to an inlet and an outlet on its side, and an aeration head is also installed inside the test water tank.

[0016] The present invention proposes a heating element fatigue testing device, which has the following advantages: the present invention realizes the automatic transfer of the heating element between the test water tank and the cold zone through the cooperation of the transfer mechanism and the clamping mechanism, without the need for manual intervention, which significantly reduces labor intensity; the temperature is monitored in real time by the sensing control component, and heating is stopped when the threshold is reached, which ensures the uniformity of fatigue test conditions and the accuracy of test data; the automated reciprocating cycle test process greatly shortens the single test cycle, effectively improving the overall convenience and efficiency of heating element fatigue testing. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the test water tank structure of the present invention; Figure 3 This is a schematic diagram of the transfer mechanism structure of the present invention; Figure 4 This is a schematic diagram of the mounting plate structure of the present invention; Figure 5 This is a schematic diagram of the clamping mechanism of the present invention; Figure 6 This is a schematic diagram of the drive mechanism structure of the present invention; Figure 7 This is a schematic diagram of the control mechanism structure of the present invention; Figure 8 This is a schematic diagram of the sensing control component structure of the present invention. Figure 1 ; Figure 9 This is a schematic diagram of the sensing control component structure of the present invention. Figure 2 ; Figure 10 This is a cross-sectional view of the sensing control component of the present invention.

[0018] In the diagram: 1. Machine base; 2. Transfer mechanism; 3. Test water tank; 31. Inlet; 32. Outlet; 33. Aeration head; 4. Mounting plate; 5. Clamping mechanism; 51. Clamping base; 52. Guide groove; 53. Guide shaft; 54. Clamping roller; 6. Drive mechanism; 61. Cylinder; 62. Slide; 63. First rack; 64. Rotating shaft; 65. First gear; 66. Synchronous disc; 67. Connecting rod; 68. Compression spring 69. Stop block; 7. Sensing control component; 71. Transfer plate; 72. Support base; 73. Movable rod; 74. Spring; 75. Temperature sensing element; 76. Connecting ring; 77. Heat-conducting block; 78. Conductive contact; 79. Counting plate; 710. Counting contact; 711. Press switch; 8. Control mechanism; 81. Synchronous shaft; 82. Second gear; 83. Third gear; 84. Second rack; 85. Third rack. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figures 1-10 As one embodiment of the present invention, a fatigue testing device for heating tubes is disclosed. This device is mainly used for heating and cooling fatigue cycle testing of heating tubes, as described above. Figure 1 Specifically, the testing device includes a machine base 1 and a transfer mechanism 2 installed on the machine base 1. The transfer mechanism 2 includes a lifting module and a lateral movement module. Both the lifting module and the lateral movement module can be configured as ball screw assemblies to achieve height and lateral position control of the mounting plate 4. The specific structure is a conventional method for those skilled in the art and will not be described in detail here. A test water tank 3 is also installed above the machine base 1. An installation plate 4 is provided on the slide of the transfer mechanism 2. A clamping mechanism 5 is provided below the installation plate 4. A drive mechanism 6 is provided on the upper side of the installation plate 4 to drive the clamping mechanism 5 to move. A sensing control component 7 is also provided below the mounting plate 4, and the sensing control component 7 and the clamping mechanism 5 are arranged opposite to each other.

[0021] During operation, the transfer mechanism 2 first moves the mounting plate 4 above the test water tank 3. Then, the lifting module drives the mounting plate 4 to descend, immersing the heating element under test into the water in the test water tank 3. The clamping mechanism 5 securely holds the heating element. During the heating phase, the heating element is powered on, and the sensing control component 7 monitors the temperature change of the heating element in real time. When the sensing control component 7 detects that the temperature has reached the preset threshold temperature, it sends a signal to control the heating element to stop heating. Subsequently, the transfer mechanism 2 operates, lifting the heating element from the test water tank 3 via the lifting module, separating it from the water and allowing it to enter the air cooling stage. After the cooling time is completed or the temperature drops, the transfer mechanism 2 immerses the heating element back into the water for the next round of heating. This cycle repeats continuously, achieving convenience and efficiency in heating element fatigue testing through automated control. It eliminates the need for frequent manual intervention in temperature measurement and transfer, effectively improving the accuracy of the test data.

[0022] Specifically, the present invention achieves automatic transfer of the heating element between the test water tank 3 and the cold zone through the cooperation of the transfer mechanism 2 and the clamping mechanism 5, without the need for manual intervention, which significantly reduces labor intensity. The temperature is monitored in real time by the sensing control component 7, and heating is stopped when the threshold is reached, which ensures the uniformity of fatigue test conditions and the accuracy of test data. The automated reciprocating cycle test process greatly shortens the single test cycle and effectively improves the overall convenience and efficiency of heating element fatigue testing.

[0023] Reference Figure 5 In some embodiments, the clamping mechanism 5 of the present invention includes; A clamping base 51 is fixedly installed on the lower side of the mounting plate 4; Three guide grooves 52 are provided on the end face of the clamping base 51. A guide shaft 53 is slidably connected inside the guide groove 52. A clamping roller 54 is fixedly installed on the lower side of the mounting plate 4 on the guide shaft 53.

[0024] In this embodiment, a three-roller centering clamping structure is formed by setting three clamping rollers 54 arranged in a triangle. When clamping the heating tube, the three clamping rollers 54 move radially under the guidance of the guide shaft 53 and the guide groove 52, and hold the heating tube tightly from three directions.

[0025] Reference Figure 6 , Figure 7 Specifically, the driving mechanism 6 in this invention includes; Cylinder 61 is mounted on the mounting plate 4; A slide 62 is fixedly mounted on the shaft end of the cylinder 61. A first rack 63 is provided on one side of the slide 62. A rotating shaft 64 is rotatably connected to the middle of the mounting plate 4. A first gear 65 is fixedly mounted on the upper end of the rotating shaft 64. The first gear 65 and the first rack 63 mesh and drive each other, thereby converting the linear motion of the cylinder 61 into the rotational motion of the rotating shaft 64.

[0026] In addition, a synchronization disk 66 is fixedly installed at the lower end of the rotating shaft 64, and three connecting rods 67 are pinned to the end face of the synchronization disk 66. The other end of the connecting rods 67 is rotatably connected to the guide shaft 53.

[0027] When testing and clamping the heating element, the cylinder 61 first extends and retracts to drive the slide 62 to move. Through the meshing transmission of the first rack 63 and the first gear 65, the rotating shaft 64 is driven to rotate. The synchronous disk 66 at the lower end of the rotating shaft 64 rotates accordingly, and through three connecting rods 67, it pulls the corresponding guide shaft 53 to slide synchronously in the guide groove 52. This structure cleverly transforms the linear driving force of a single cylinder into the synchronous radial movement of three clamping rollers 54, realizing automatic centering, clamping, and releasing of the heating element. This ensures the consistency of the clamping action and simplifies the structural layout of the device.

[0028] It should be noted that the clamping mechanism 5 described in this embodiment clamps the tail end of the heating tube. A wiring terminal is fixedly installed on the end face of the mounting plate 4. After the heating tube is clamped and fixed, its wires are electrically connected to the wiring terminal, thus completing the power supply to the heating tube.

[0029] Reference Figure 6 In an optional embodiment, the cylinder 61 and the mounting plate 4 are slidably connected, a compression spring 68 is fixedly connected between the cylinder 61 and the mounting plate 4, a stop block 69 for stopping the first rack 63 is fixedly installed at the front end of the mounting plate 4, and a control mechanism 8 is also provided between the cylinder 61 and the sensing control component 7.

[0030] During the clamping process, cylinder 61 extends to drive the first rack 63 to move. Once the clamping roller 54 clamps the heating element, the first rack 63 immediately contacts the stop block 69 and stops moving. At this time, cylinder 61 continues to extend; due to the obstruction of the first rack 63, the cylinder body overcomes the spring force of the compression spring 68 and slides in the opposite direction relative to the mounting plate 4. This reverse movement of cylinder 61 drives the sensing control component 7 via the control mechanism 8, causing its probe to approach the tail end of the clamped heating element for temperature detection.

[0031] This design utilizes the stroke switching of mechanical transmission to automatically trigger the approach action of the temperature measuring component while completing the clamping action. It is not only compact in structure, but also ensures that the sensing control component 7 can accurately fit the part to be measured by the heating tube, avoiding the problem of inaccurate temperature measurement caused by the shaking or position deviation of the heating tube.

[0032] Reference Figure 7 , Figure 8 In some embodiments, the sensing control component 7 of the present invention includes; A transfer plate 71 is slidably connected to the lower side of the mounting plate 4; A support base 72 is fixedly installed on the end face of the transfer plate 71. A movable rod 73 is movably inserted into the end face of the support base 72. A spring 74 is fixedly connected between the movable rod 73 and the support base 72. A temperature sensing element 75 is also provided at the end of the movable rod 73. The temperature sensing element 75 is a bimetallic strip.

[0033] In this embodiment, the transfer plate 71 is used to move the entire sensing control assembly 7 under the drive of the control mechanism 8, so that the bimetallic strip is close to the part to be tested of the heating element. The temperature sensing element 75 adopts a bimetallic strip structure, which utilizes the principle that different metals have different coefficients of thermal expansion. When the heating element in the test water tank 3 heats up and causes the temperature of the surrounding medium to change, the bimetallic strip undergoes physical deformation due to heat.

[0034] This deformation can serve as a control signal to trigger the external circuit to disconnect, thereby achieving the control logic of stopping heating once the temperature is reached. Simultaneously, the cooperation between the movable rod 73 and the spring 74 forms a floating buffer structure. When the control mechanism 8 drives the temperature sensing element 75 to abut the end of the trigger heat pipe, the spring 74 acts as a buffer, preventing hard contact that could damage the bimetallic strip or the heating element, ensuring contact reliability during testing, and thus improving the accuracy of temperature detection.

[0035] Reference Figure 9 Based on the above embodiments, in this embodiment, a connecting ring 76 is fixedly installed on the outer side of the movable rod 73. A heat-conducting block 77 and a temperature-sensing element 75 are fixedly installed on the upper and lower sides of the connecting ring 76, respectively. The heat-conducting block 77 is sleeved on the outer side of the temperature-sensing element 75. Two conductive contacts 78 are provided on the end face of the heat-conducting block 77. The temperature-sensing element 75 and the two conductive contacts 78 are electrically connected.

[0036] Reference Figure 10 Specifically, in this embodiment, the heat-conducting block 77 is sleeved on the outside of the temperature-sensing element 75. When the sensing control component 7 approaches the tail end of the heating tube, the heat-conducting block 77 can quickly absorb the heat on the surface of the heating tube and transfer it to the temperature-sensing element 75, which greatly improves the temperature response speed. Preferably, the heat-conducting block 77 in this embodiment can be set as a copper block. Of course, since copper blocks are conductive, in order to achieve insulation, an insulating sleeve can be added between the copper block and the conductive contact 78 to avoid interference with the two conductive contacts 78.

[0037] When the bimetallic strip deforms due to heat, it directly drives the two conductive contacts 78 to separate or close. By connecting the conductive contacts 78 to the control circuit of the heating element, the on / off control of the heating power supply can be achieved.

[0038] Reference Figure 10 Preferably, in this embodiment, a counting plate 79 is also fixedly installed on the back end of the connecting ring 76; Two counting contacts 710 are also provided on the end face of the counting plate 79. After the temperature sensing element 75 is deformed, it comes into contact with the two counting contacts 710. A push switch 711 is also provided at the end of the movable rod 73. The contact of the push switch 711 passes through the temperature sensing element 75 and the heat conducting block 77.

[0039] Specifically, when the transfer mechanism 2 immerses the heating element in water, the sensing control component 7 approaches the tail end of the heating element under the drive of the control mechanism 8. At this time, the contact of the pressing switch 711 first contacts the surface of the heating element and is pressed in, triggering a positioning signal. This signal confirms that the clamping is correct and that the temperature probe has made contact, and the system then controls the heating element to be powered on to start heating. As the heating element operates, heat is rapidly transferred to the temperature sensing element 75 through the heat-conducting block 77. When the temperature reaches the preset threshold, the bimetallic strip deforms due to heat, and its free end lifts up and pushes open the conductive contact 78, cutting off the heating circuit and stopping the heating element from heating.

[0040] As the temperature sensing element 75 deforms and cuts off the power, its actuating end simultaneously contacts the counting contact 710 on the counting board 79. The system records this signal as a complete thermal cycle count, thus achieving automatic statistics.

[0041] After heating stops, the transfer mechanism lifts the heating element out of the water and into the cold zone. During this process, the temperature of the heating element gradually decreases, and the temperature sensing element 75 cools down and returns to its original state, disengaging from the counting contact 710. At this time, the pressure switch 711 remains pressed to confirm that the heating element is still in the detected position. The system determines that cooling is complete, and then the control mechanism resets, preparing to enter the next heating cycle.

[0042] By repeating this process, the entire fatigue test sequence—heating, stopping, counting, cooling, and reheating—can be precisely completed without human intervention, utilizing the linkage logic of a purely mechanical structure.

[0043] Reference Figure 7 Based on the above embodiments, the control mechanism 8 in this invention includes: The synchronous shaft 81 is rotatably connected to the mounting plate 4; The upper and lower ends of the synchronous shaft 81 are respectively fixedly installed with a second gear 82 and a third gear 83. The end faces of the cylinder 61 and the transfer plate 71 are respectively installed with a second rack 84 and a third rack 85. The second rack 84 and the second gear 82 mesh and drive each other, and the third rack 85 and the third gear 83 mesh and drive each other.

[0044] Specifically, during the test, the cylinder 61 first extends and drives the clamping mechanism 5 to close and clamp the heating tube through the cooperation of the first rack 63 and the first gear 65. At this time, the first rack 63 has not yet contacted the stop block 69, the cylinder 61 body remains stationary, and the sensing control component 7 is in the standby position. After the clamping roller 54 clamps the heating element, the first rack 63's forward movement is obstructed, contacting the stop block 69. At this time, the cylinder 61 continues to extend. Since the rack is stationary, the cylinder body is forced to overcome the elastic force of the compression spring 68, causing it to slide in the opposite direction. The reverse sliding of the cylinder 61 drives the second rack 84 on it to move. The second rack 84 drives the second gear 82 to rotate, which in turn drives the third gear 83 to rotate synchronously through the synchronous shaft 81. The third gear 83 then drives the third rack 85 to move, causing the transfer plate 71 to move closer to the tail end of the heating element.

[0045] Finally, the sensing control component 7, driven by the transfer plate 71, precisely probes in, making the temperature sensing element 75 contact the tail end of the heating tube, and begins real-time temperature monitoring. This structure utilizes the transmission logic of gears and racks to achieve clamping before temperature measurement control, effectively preventing the temperature probe from being interfered with or damaged during clamping, and ensuring the continuity and reliability of the test action.

[0046] Reference Figure 2 It should be noted that, in this embodiment, the test water tank 3 is connected to an inlet 31 and an outlet 32 ​​on its side, and an aeration head 33 is also provided inside the test water tank 3.

[0047] During the heating test, the aeration head 33 is connected to an external air source and injects air into the water, causing the water in the test tank 3 to continuously churn. This design simulates the state of liquid flow in a heating element in a real-world application scenario, such as a water heater or kettle, effectively avoiding localized overheating or temperature stratification caused by stagnant water, thereby improving the accuracy and reference value of the fatigue test results.

[0048] The design of the inlet 31 and outlet 32 ​​is used to achieve dynamic balance control of water temperature. When the test is completed and cooling is required or the next cycle is to be carried out, cold water can be introduced through the inlet 31 and hot water can be discharged through the outlet 32. This circulating water exchange method can quickly reduce the temperature of the medium in the test water tank 3, ensuring that the starting temperature of each test is consistent, which greatly improves the stability of batch fatigue testing and the comparability of data.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fatigue testing device for heating elements, characterized in that, include: Machine base (1) and transfer mechanism (2) installed on the machine base (1); A test water tank (3) is also installed above the machine (1). A mounting plate (4) is provided on the slide of the transfer mechanism (2). A clamping mechanism (5) is provided below the mounting plate (4). A drive mechanism (6) is provided on the upper side of the mounting plate (4) to drive the clamping mechanism (5) to move. A sensing control component (7) is provided below the mounting plate (4), and the sensing control component (7) and the clamping mechanism (5) are arranged opposite to each other.

2. The heating element fatigue testing device according to claim 1, characterized in that: The clamping mechanism (5) includes; A clamping base (51) is fixedly installed on the lower side of the mounting plate (4); Three guide grooves (52) are provided on the end face of the clamping base (51). A guide shaft (53) is slidably connected inside the guide groove (52). A clamping roller (54) is fixedly installed on the lower side of the mounting plate (4) of the guide shaft (53).

3. The heating element fatigue testing device according to claim 2, characterized in that: The drive mechanism (6) includes; Cylinder (61) mounted on the mounting plate (4); The cylinder (61) has a slide (62) fixedly mounted on its shaft end. A first rack (63) is provided on one side of the slide (62). A rotating shaft (64) is rotatably connected to the middle of the mounting plate (4). A first gear (65) is fixedly mounted on the upper end of the rotating shaft (64). The first gear (65) and the first rack (63) mesh and drive each other.

4. The heating element fatigue testing device according to claim 3, characterized in that: A timing disc (66) is fixedly installed at the lower end of the rotating shaft (64). Three connecting rods (67) are pinned to the end face of the timing disc (66). The other end of the connecting rods (67) is rotatably connected to the guide shaft (53).

5. The heating element fatigue testing device according to claim 3, characterized in that: The cylinder (61) and the mounting plate (4) are slidably connected. A compression spring (68) is fixedly connected between the cylinder (61) and the mounting plate (4). A stop block (69) that stops the first rack (63) is fixedly installed at the front end of the mounting plate (4). A control mechanism (8) is also provided between the cylinder (61) and the sensing control component (7).

6. The heating element fatigue testing device according to claim 1, characterized in that: The sensing control component (7) includes; A transfer plate (71) is slidably connected to the underside of the mounting plate (4); A support base (72) is fixedly installed on the end face of the transfer plate (71). A movable rod (73) is movably inserted into the end face of the support base (72). A spring (74) is fixedly connected between the movable rod (73) and the support base (72). A temperature sensing element (75) is also provided at the end of the movable rod (73).

7. The heating element fatigue testing device according to claim 6, characterized in that: A connecting ring (76) is fixedly installed on the outer side of the movable rod (73). A heat-conducting block (77) and a temperature-sensing element (75) are fixedly installed on the upper and lower sides of the connecting ring (76), respectively. The heat-conducting block (77) is sleeved on the outer side of the temperature-sensing element (75). Two conductive contacts (78) are provided on the end face of the heat-conducting block (77). The temperature-sensing element (75) and the two conductive contacts (78) are electrically connected.

8. The heating element fatigue testing device according to claim 7, characterized in that: A counting plate (79) is also fixedly installed on the back end of the connecting ring (76). The temperature sensing element (75) is configured as a bimetallic strip, and two counting contacts (710) are also provided on the end face of the counting plate (79). After the temperature sensing element (75) is deformed, it comes into contact with the two counting contacts (710). The end of the movable rod (73) is also provided with a push switch (711), and the contact of the push switch (711) passes through the temperature sensing element (75) and the heat-conducting block (77).

9. The heating element fatigue testing device according to claim 3, characterized in that: The control mechanism (8) includes; Rotary connection of synchronous shaft (81) to the mounting plate (4); The upper and lower ends of the synchronous shaft (81) are respectively fixedly mounted with a second gear (82) and a third gear (83). The cylinder (61) and the transfer plate (71) are respectively mounted with a second rack (84) and a third rack (85). The second rack (84) and the second gear (82) mesh and drive each other, and the third rack (85) and the third gear (83) mesh and drive each other.

10. A heating element fatigue testing device according to any one of claims 1-9, characterized in that: The test water tank (3) is connected to an inlet (31) and an outlet (32) on its side, and an aeration head (33) is also provided inside the test water tank (3).

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