Device and method for testing durability of sensor

Abstract

The invention discloses a durability testing device and method for a sensor, and relates to the technical field of sensor detection, the durability testing device comprises a support frame and an electric push rod, a linear driving device is arranged in the support frame, the durability testing device further comprises a heating device, the heating device is fixedly installed on the surface of the support frame, and a heating wire is arranged on the heating device; the heat preservation bin is fixedly mounted on the circumferential surface of the heating device, and a through hole is formed in the top of the heat preservation bin; the long rod penetrates through the top of the supporting frame in a sliding mode, and the top of the long rod is fixedly connected with the output end of the electric push rod; the hollow cylinder is fixedly mounted at the bottom of the long rod; by blocking the through hole of the heat preservation bin, the loss of the temperature in the heat preservation bin can be reduced, and in the continuous durability test, the resource consumption can be reduced, and the overall efficiency of the test can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor detection, and in particular to a durability testing device and method for a sensor. Background Art

[0002] Durability test equipment for temperature sensors is usually used to simulate and evaluate the working performance and stability of temperature sensors under different environmental conditions to ensure that they will not fail or degrade in performance during long-term use.

[0003] The patent with patent announcement number CN218036648U relates to a high-temperature durability testing device for nitrogen oxide sensors, including a power supply assembly and a probe fixing bracket. The power supply assembly is connected to an industrial computer, a voltage regulator, a heater and a motor controller. The industrial computer is connected to the motor controller, and the motor controller is connected to a linear motor. The motor controller controls the forward and reverse rotation of the linear motor. This device heats the ambient temperature around the nitrogen oxide sensor through a heater, thereby ensuring that the nitrogen oxide sensor can work for a long time at high temperatures of 600°C and 800°C. At the same time, it can automatically start and stop through a timer, thereby automatically cycling 20 times to test the accuracy of the nitrogen oxide sensor and the stability of the ceramic core of the nitrogen oxide sensor.

[0004] The above patent has the effect of improving the test stability. The timer can automatically start and stop, and automatically cycle 20 times to test the accuracy of the nitrogen oxide sensor. However, during the high-temperature endurance test, the test not only requires the sensor to be tested alternately by hot and cold cycles, but also must be heated again after each cooling. This not only greatly extends the test time, but also leads to energy waste and resource consumption, and increases the burden on the test equipment. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a sensor durability testing device and method, which solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A durability testing device for a sensor, comprising a support frame and an electric push rod, wherein a linear drive device is provided inside the support frame, and further comprising: a heating device, wherein the heating device is fixedly mounted on the surface of the support frame, and a heating wire is provided on the heating device; a heat preservation chamber, wherein the heat preservation chamber is fixedly mounted on the circumferential surface of the heating device, and a through hole is opened on the top of the heat preservation chamber; a long rod, wherein the long rod slides through the top of the support frame, and the top of the long rod is fixedly connected to the output end of the electric push rod; a hollow cylinder, wherein the hollow cylinder is fixedly mounted on the bottom of the long rod, and the output end of the electric push rod drives the long rod to move upward, and the movement of the long rod drives the hollow cylinder to move upward; a placing frame, wherein the placing frame is fixedly mounted on the circumferential surface of the hollow cylinder; a circular ring, wherein the circular ring is fixedly mounted on the surface of the placing frame; an elastic sheet, wherein the elastic sheet is arranged on the inner wall of the circular ring; an extrusion plate, wherein the extrusion plate is fixedly mounted on the surface of the elastic sheet, and the extrusion plate moves to extrude the elastic sheet, and the deformed elastic sheet applies a reaction force to the extrusion plate.

[0007] According to the above technical solution, a movable plate slides through the interior of the hollow cylinder, a No. 1 spring is arranged between the movable plate and the hollow cylinder, a sealing plate is fixedly installed on the surface of the movable plate, and the movement of the movable plate drives the sealing plate to move up. At this time, the deformed No. 1 spring gradually resets.

[0008] According to the above technical solution, the circumferential surface of the hollow cylinder fits the inner wall of the through hole of the insulation chamber, the sealing plate contacts the top of the insulation chamber, and the deformed No. 1 spring applies a downward pulling force to the sealing plate. Under the action of the pulling force, the sealing plate remains tightly fitted with the insulation chamber.

[0009] According to the above technical solution, a protective device for cooling the sensor is provided on the support frame, and an alarm device for improving cooling safety is provided on the protective device; the protective device includes a connecting rod, a cylinder, a contact frame, a Y-shaped plate, a cylindrical rod, a protective plate and an outer frame, the sealing plate moves up and contacts the bottom of the contact frame, so that the sealing plate pushes the contact frame to move up, the connecting rod slides through the inner and outer walls of the support frame, one end of the connecting rod is fixedly connected to the movable end of the linear drive device, the cylinder is fixedly installed on the other end of the connecting rod, the contact frame slides through the top of the cylinder, the Y-shaped plate is fixedly installed on the top of the contact frame, the cylindrical rod is fixedly installed on the bottom of the Y-shaped plate, the contact frame drives the Y-shaped plate to move up, the Y-plate drives the cylindrical rod to move up, the protective plate is fixedly installed on the bottom of the cylindrical rod, the outer frame is fixedly installed on the circumferential surface of the cylinder, and a breathable plate is provided on the circumferential surface of the cylinder.

[0010] According to the above technical solution, the bottom of the cylinder contacts the top of the insulation bin, the connecting rod moves to drive the cylinder upward, the cylinder moves upward and loses contact with the insulation bin, and the shape of the protective plate is set to be arc-shaped.

[0011] According to the above technical solution, the protective plate contacts the circumferential surface of the cylinder, a sliding groove is provided on the outer frame, the protective plate contacts the inner wall of the sliding groove, and when the protective plate moves, the outer frame provides support for the moving protective plate.

[0012] According to the above technical solution, the alarm device includes a buzzer, a button, a rectangular frame, a rectangular plate, a rotating rod and an L-shaped plate. The Y-shaped plate moves upward and contacts the L-shaped plate, so that the Y-shaped plate moves and pushes the L-shaped plate up. The buzzer is fixedly installed on the top of the cylinder, the button is set at the bottom of the buzzer, the rectangular frame is fixedly installed at the bottom of the buzzer, the rectangular plate is slidably installed inside the rectangular frame, the rotating rod rotates and passes through the inner and outer walls of the rectangular plate, the L-shaped plate is fixedly installed on the surface of the rotating rod, the L-shaped plate drives the rotating rod to move upward, and the rotating rod drives the rectangular plate to move up. A through groove is opened on the outer wall of the rectangular frame, the rotating rod contacts the inner wall of the through groove, and a spiral spring is arranged between the rotating rod and the rectangular plate.

[0013] According to the above technical solution, a sliding seat is fixedly installed on the surface of the rectangular frame, a convex rod is slidably installed inside the sliding seat, and a limiting plate is fixedly installed on the circumferential surface of the convex rod, pushing the limiting plate to move toward the other end of the sliding seat. The movement of the limiting plate drives the convex rod to move synchronously.

[0014] A method for using a sensor durability testing device, using the above-mentioned sensor durability testing device, includes the following steps: Step 1: Start the heating device, the insulation wire on the heating device begins to heat up, and the insulation wire increases the temperature in the insulation chamber; Step 2: The output end of the electric push rod drives the long rod to move upward, the movement of the long rod drives the hollow cylinder to move upward, and the movement of the hollow cylinder drives the placement rack to move out of the insulation warehouse; Step 3: Place the sensor to be tested on the placement rack from top to bottom. After placement, the output end of the electric push rod drives the long rod down to the starting position; Step 4: After the placement rack moves to the starting position, the high-temperature gas in the insulation chamber comes into contact with the sensor to perform a high-temperature durability test.

[0015] The present invention provides a sensor durability testing device, which has the following beneficial effects: (1) In the durability test device of the sensor, when the placement rack moves to the specified position, the bottom of the placement rack blocks the through hole. By blocking the through hole of the insulation chamber, it helps to reduce the loss of temperature inside the insulation chamber. In the continuous durability test, it can reduce resource consumption and improve the overall efficiency of the test.

[0016] (2) The durability test device of the sensor, the elastic sheet applies a reaction force to the extrusion plate, so that the extrusion plate and the sensor are in close contact. The reaction force applied by the elastic sheet allows the extrusion plate to adapt to the sizes of different sensors, which is convenient for stabilizing different sensors. At the same time, the No. 1 spring applies a downward pulling force to the sealing plate, and the No. 1 spring is pulled down through the hollow tube to improve the fit between the sealing plate and the insulation chamber, thereby ensuring the efficiency of heating the insulation chamber.

[0017] (3) The durability test device of the sensor, the protective plate moves up to release the seal on the cylinder air-permeable plate, and different effects can be achieved through the multiple uses of the connecting rod, which helps to improve the flexibility of the use of the cylinder and the protective plate. At the same time, the protective plate is reset to seal the air-permeable plate. When the sensor re-enters the insulation chamber through the placement rack, the protective plate can automatically reset to seal the air-permeable plate, which helps to improve the stability of multiple high-temperature tests.

[0018] (4) The durability test device of the sensor is designed. The rectangular plate moves and squeezes the button to start the buzzer. When the protective plate is opened, the buzzer is quickly activated to alarm, which helps to improve the safety of the test. At the same time, the limit plate imposes a limit on the rotation of the L-shaped plate. By quickly adjusting the angle of the L-shaped plate and applying an effective limit, it helps to improve the flexibility of operation during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of a half-section structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the heat preservation bin of the present invention; Figure 4 This is a schematic diagram of the overall structure of the ring of the present invention; Figure 5 This is a schematic diagram of the internal structure of the hollow cylinder of the present invention; Figure 6 This is a schematic diagram of the internal structure of the cylinder of the present invention; Figure 7 This is a schematic diagram of the outer frame position structure of the present invention; Figure 8 This is a schematic diagram of the position structure of the air permeable plate of the present invention; Figure 9 Schematic diagram of the overall structure of the buzzer of the present invention; Figure 10 It is a schematic diagram of the internal structure of the rectangular frame of the present invention.

[0020] In the figure: 1. support frame; 2. heating device; 3. insulation chamber; 4. long rod; 5. hollow cylinder; 6. placement rack; 7. ring; 8. elastic sheet; 9. extrusion plate; 10. movable plate; 11. spring No. 1; 12. sealing plate; 131. connecting rod; 132. cylinder; 133. contact frame; 134. Y-shaped plate; 135. cylindrical rod; 136. protective plate; 137. outer frame; 141. buzzer; 142. button; 143. rectangular frame; 144. rectangular plate; 145. rotating rod; 146. L-shaped plate; 147. slide; 148. convex rod; 149. limit plate. DETAILED DESCRIPTION

[0021] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] See also Figures 1-6 , one embodiment of the present invention is: a durability testing device for a sensor, comprising a support frame 1 and an electric push rod, a linear drive device is provided inside the support frame 1, and further comprising: a heating device 2, the heating device 2 is fixedly mounted on the surface of the support frame 1, and a heating wire is provided on the heating device 2; a heat preservation chamber 3, the heat preservation chamber 3 is fixedly mounted on the circumferential surface of the heating device 2, and a through hole is opened on the top of the heat preservation chamber 3; a long rod 4, the long rod 4 slides through the top of the support frame 1, and the top of the long rod 4 is fixedly connected to the output end of the electric push rod; a hollow cylinder 5, the hollow cylinder 5 is fixedly mounted on the bottom of the long rod 4; a placement frame 6, the placement frame 6 is fixedly mounted on the circumferential surface of the hollow cylinder 5; a circular ring 7, the circular ring 7 is fixedly mounted on the surface of the placement frame 6; an elastic sheet 8, the elastic sheet 8 is arranged on the inner wall of the circular ring 7; an extrusion plate 9, the extrusion plate 9 is fixedly mounted on the surface of the elastic sheet 8, and when the placement frame 6 moves to a specified position, the bottom of the placement frame 6 blocks the through hole to reduce the loss of temperature inside the heat preservation chamber 3.

[0023] A movable plate 10 slides through the interior of the hollow cylinder 5, and a spring 11 is provided between the movable plate 10 and the hollow cylinder 5. A sealing plate 12 is fixedly mounted on the surface of the movable plate 10. The reaction force exerted by the elastic sheet 8 allows the extrusion plate 9 to adapt to the sizes of different sensors, making it convenient to stabilize different sensors.

[0024] The circumferential surface of the hollow tube 5 fits with the inner wall of the through hole of the insulation chamber 3, and the sealing plate 12 contacts the top of the insulation chamber 3. The spring 11 is pulled down by the hollow tube 5 to improve the fit between the sealing plate 12 and the insulation chamber 3, thereby ensuring the heating efficiency of the insulation chamber 3.

[0025] A method for using a sensor durability testing device, using the above-mentioned sensor durability testing device, includes the following steps: Step 1: Start the heating device 2, the insulation wire on the heating device 2 starts to heat up, and the insulation wire increases the temperature in the insulation chamber 3; Step 2: The output end of the electric push rod drives the long rod 4 to move upward, the movement of the long rod 4 drives the hollow cylinder 5 to move upward, and the movement of the hollow cylinder 5 drives the placement rack 6 to move out of the insulation bin 3; Step 3: Place the sensor to be tested on the placement rack 6 from top to bottom. After placement, the output end of the electric push rod drives the long rod 4 down to the starting position; Step 4: After the placement rack 6 moves to the starting position, the high-temperature gas in the heat preservation chamber 3 contacts the sensor and a high-temperature durability test is performed.

[0026] When the present embodiment is working, the heating device 2 is started, and the heating device 2 heats up to increase the temperature in the heat preservation chamber 3; when the heat preservation chamber 3 is heated, the output end of the electric push rod drives the long rod 4 to move upward, and the long rod 4 moves to drive the hollow cylinder 5 to move upward, and the hollow cylinder 5 moves to drive the placement rack 6 to move upward, and at the same time, the hollow cylinder 5 moves to drive the movable plate 10 to move upward, and the movable plate 10 moves to drive the sealing plate 12 to move upward. At this time, the deformed spring No. 1 1 gradually resets; when the placement rack 6 moves to the specified position, the bottom of the placement rack 6 blocks the through hole, reducing the loss of temperature inside the heat preservation chamber 3; the sensor to be tested is placed in the placement rack 6 from top to bottom, the sensor moves and contacts the curved surface of the extrusion plate 9, and the sensor continues to move to push the extrusion plate 9 to move in the direction of the ring 7, and the extrusion plate 9 moves to extrude the elastic sheet 8, and the deformed elastic sheet 8 exerts a reverse force on the extrusion plate 9 The action force makes the extrusion plate 9 and the sensor in close contact. The reaction force applied by the elastic sheet 8 makes the extrusion plate 9 adapt to the sizes of different sensors, which is convenient for stabilizing different sensors. After the placement is completed, the output end of the electric push rod drives the long rod 4 to move down to the starting position, and the synchronously moving sealing plate 12 contacts the top of the insulation bin 3 during the movement. The sealing plate 12 is blocked by the insulation bin 3 and stops moving. At this time, the hollow cylinder 5 continues to move to stretch the No. 1 spring 11. The deformed No. 1 spring 11 applies a downward pulling force to the sealing plate 12. The sealing plate 12 remains in close fit with the insulation bin 3 under the action of the pulling force; when the placement rack 6 moves to the starting position, the high-temperature durability test of the sensor is carried out, and the No. 1 spring 11 is pulled down by the hollow cylinder 5 to improve the fit between the sealing plate 12 and the insulation bin 3, thereby ensuring the efficiency of heating the insulation bin 3.

[0027] See also Figures 1-10On the basis of the above embodiment, in another embodiment of the present invention, a protective device for cooling the sensor is provided on the support frame 1, and an alarm device for improving cooling safety is provided on the protective device; the protective device includes a connecting rod 131, a cylinder 132, a contact frame 133, a Y-shaped plate 134, a cylindrical rod 135, a protective plate 136 and an outer frame 137, the connecting rod 131 slides through the inner and outer walls of the support frame 1, one end of the connecting rod 131 is fixedly connected to the moving end of the linear drive device, and the cylinder 132 is fixedly installed At the other end of the connecting rod 131, the contact frame 133 slides through the top of the cylinder 132, the Y-shaped plate 134 is fixedly mounted on the top of the contact frame 133, the cylindrical rod 135 is fixedly mounted on the bottom of the Y-shaped plate 134, the protective plate 136 is fixedly mounted on the bottom of the cylindrical rod 135, and the outer frame 137 is fixedly mounted on the circumferential surface of the cylinder 132. A breathable plate is provided on the circumferential surface of the cylinder 132. Through the various uses of the connecting rod 131, different effects can be achieved, which helps to improve the flexibility of use of the cylinder 132 and the protective plate 136.

[0028] The bottom of the cylinder 132 contacts the top of the insulation chamber 3, and the shape of the protective plate 136 is set to be arc-shaped. When re-entering the insulation chamber 3 through the placement rack 6, the protective plate 136 can automatically reset and close the breathable plate, which helps to improve the stability of multiple high-temperature detections.

[0029] The protective plate 136 contacts the circumferential surface of the cylinder 132, and a slide groove is provided on the outer frame 137. The protective plate 136 contacts the inner wall of the slide groove. By setting the outer frame 137, the smooth movement of the protective plate 136 is improved, ensuring that the protective plate 136 can be smoothly reset to seal the breathable plate.

[0030] The alarm device includes a buzzer 141, a button 142, a rectangular frame 143, a rectangular plate 144, a rotating rod 145 and an L-shaped plate 146. The buzzer 141 is fixedly mounted on the top of the cylinder 132, the button 142 is arranged at the bottom of the buzzer 141, the rectangular frame 143 is fixedly mounted on the bottom of the buzzer 141, the rectangular plate 144 is slidably mounted inside the rectangular frame 143, the rotating rod 145 rotates and passes through the inner and outer walls of the rectangular plate 144, the L-shaped plate 146 is fixedly mounted on the surface of the rotating rod 145, the outer wall of the rectangular frame 143 is provided with a through groove, the rotating rod 145 contacts the inner wall of the through groove, and a spiral spring is arranged between the rotating rod 145 and the rectangular plate 144. When the protective plate 136 is opened, the buzzer 141 is quickly started to alarm, which helps to improve the safety of the test.

[0031] A slide 147 is fixedly installed on the surface of the rectangular frame 143, and a convex rod 148 is slidably installed inside the slide 147. A limit plate 149 is fixedly installed on the circumferential surface of the convex rod 148. By quickly adjusting the angle of the L-shaped plate 146 and applying effective limits, it helps to improve the flexibility of operation during the test process.

[0032] When the sensor is placed or taken out of the heat preservation chamber 3, the linear drive device is first started to drive the connecting rod 131 to move upward, and the connecting rod 131 moves to drive the cylinder 132 to move upward and disengage from the heat preservation chamber 3. At this time, the electric push rod is started again to complete the placement and taking of the sensor; when the sensor in the heat preservation chamber 3 needs to be cooled, and then heated up, the linear drive device controls the connecting rod 131 to remain stationary in the initial position, and the sealing plate 12 moves up and contacts the bottom of the contact frame 133, so that the sealing plate 12 pushes the contact frame 133 to move upward, and the contact frame 133 drives the Y-shaped plate 134 to move upward, and the Y-shaped plate 134 drives the cylindrical rod 135 to move upward, and the cylindrical rod 135 drives the protective plate 136 to move upward, and the protective plate 136 moves up to release the seal on the air permeable plate of the cylinder 132. The sensor is in a natural heat dissipation device at this time. Different effects can be achieved through the various uses of the connecting rod 131. In order to improve the flexibility of use of the cylinder 132 and the protective plate 136, when the sensor dissipates heat naturally, the high-temperature gas inside the cylinder 132 is discharged outward through the breathable plate. When the sensor completes heat dissipation, the long rod 4 moves down to move the placement rack 6 to the initial position, and the sensor after heat dissipation is subjected to a second high-temperature durability test; at the same time, the sealing plate 12 moves down and disengages from the contact rack 133, and the contact rack 133 that has lost its support gradually moves down, and the contact rack 133 drives the Y-shaped plate 134 to move down, and the Y-shaped plate 134 drives the cylindrical rod 135 to move down, and the cylindrical rod 135 drives the protective plate 136 to move down, and the protective plate 136 returns to the starting position to re-block the breathable plate. At the same time, the outer frame 137 provides support for the moving protective plate 136. When re-entering the heat preservation chamber 3 through the placement rack 6, the protective plate 136 can automatically reset to close the breathable plate, which helps to improve the stability of multiple high-temperature tests; When the protective plate 136 is opened, the Y-shaped plate 134 moves upward and contacts the L-shaped plate 146, so that the Y-shaped plate 134 moves to push the L-shaped plate 146 to move upward, and the L-shaped plate 146 drives the rotating rod 145 to move upward, and the rotating rod 145 drives the rectangular plate 144 to move upward, and the rectangular plate 144 moves to squeeze the button 142 to start the buzzer 141, and the buzzer 141 sounds an alarm to remind the surrounding testers; when the protective plate 136 is closed, the Y-shaped plate 134 moves downward and separates from the L-shaped plate 146. At this time, the L-shaped plate 146 drives the rotating rod 145 to move downward, and the rotating rod 145 drives the rectangular plate 144 to move downward and disengage from the button 142, and the buzzer 141 automatically turns off the alarm. When the protective plate 136 is opened, the buzzer 141 is quickly started to sound an alarm, which helps To improve the safety of the test, when the buzzer 141 is stopped, the tester manually rotates the L-shaped plate 146 when not conducting the durability test. The L-shaped plate 146 drives the rotating rod 145 to rotate, and the rotating rod 145 rotates to stretch the spiral spring. When the L-shaped plate 146 rotates to a preset angle, it pushes the limit plate 149 to move toward the other end of the slide 147. The movement of the limit plate 149 drives the convex rod 148 to move synchronously. At the same time, the limit plate 149 contacts the L-shaped plate 146 during movement. At this time, the limit plate 149 applies a limit to the rotation of the L-shaped plate 146, and the Y-shaped plate 134 moves upward and cannot contact the L-shaped plate 146 to issue an alarm. By quickly adjusting the angle of the L-shaped plate 146 and applying an effective limit, it helps to improve the flexibility of operation during the test.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sensor durability test device, comprising a support frame (1) and an electric push rod, wherein a linear drive device is provided inside the support frame (1), characterized in that: Also includes: A heating device (2), the heating device (2) being fixedly mounted on the surface of the support frame (1), and the heating device (2) being provided with a heating wire; A heat preservation chamber (3), the heat preservation chamber (3) being fixedly mounted on the circumferential surface of the heating device (2), and a through hole being provided on the top of the heat preservation chamber (3); A long rod (4), the long rod (4) slidingly passes through the top of the support frame (1), and the top of the long rod (4) is fixedly connected to the output end of the electric push rod; A hollow cylinder (5), wherein the hollow cylinder (5) is fixedly mounted on the bottom of the long rod (4); A placement rack (6), wherein the placement rack (6) is fixedly mounted on the circumferential surface of the hollow cylinder (5); A circular ring (7), wherein the circular ring (7) is fixedly mounted on the surface of the placement frame (6); an elastic sheet (8), the elastic sheet (8) being arranged on the inner wall of the ring (7); An extrusion plate (9) is fixedly mounted on the surface of the elastic sheet (8).

2. The sensor durability testing device according to claim 1, characterized in that: A movable plate (10) is slidably passed through the interior of the hollow cylinder (5), a spring (11) is provided between the movable plate (10) and the hollow cylinder (5), and a sealing plate (12) is fixedly mounted on the surface of the movable plate (10); Wherein, a protective device for cooling the sensor is provided on the support frame (1), and an alarm device for improving cooling safety is provided on the protective device.

3. The sensor durability testing device according to claim 2, characterized in that: The circumferential surface of the hollow cylinder (5) is in contact with the inner wall of the through hole of the heat preservation chamber (3), and the sealing plate (12) is in contact with the top of the heat preservation chamber (3).

4. The sensor durability testing device according to claim 3, characterized in that: The protective device comprises a connecting rod (131), a cylinder (132), a contact frame (133), a Y-shaped plate (134), a cylindrical rod (135), a protective plate (136) and an outer frame (137), wherein the connecting rod (131) slides through the inner and outer walls of the support frame (1), one end of the connecting rod (131) is fixedly connected to the movable end of the linear drive device, the cylinder (132) is fixedly mounted on the other end of the connecting rod (131), the contact frame (133) slides through the top of the cylinder (132), the Y-shaped plate (134) is fixedly mounted on the top of the contact frame (133), the cylindrical rod (135) is fixedly mounted on the bottom of the Y-shaped plate (134), the protective plate (136) is fixedly mounted on the bottom of the cylindrical rod (135), and the outer frame (137) is fixedly mounted on the circumferential surface of the cylinder (132), and a breathable plate is provided on the circumferential surface of the cylinder (132).

5. The sensor durability testing device according to claim 4, characterized in that: The bottom of the cylinder (132) contacts the top of the heat preservation chamber (3), and the shape of the protective plate (136) is set to be arc-shaped.

6. The sensor durability testing device according to claim 5, characterized in that: The protective plate (136) contacts the circumferential surface of the cylinder (132), a sliding groove is provided on the outer frame (137), and the protective plate (136) contacts the inner wall of the sliding groove.

7. The sensor durability testing device according to claim 6, characterized in that: The alarm device comprises a buzzer (141), a button (142), a rectangular frame (143), a rectangular plate (144), a rotating rod (145) and an L-shaped plate (146), wherein the buzzer (141) is fixedly mounted on the top of the cylinder (132), the button (142) is arranged at the bottom of the buzzer (141), the rectangular frame (143) is fixedly mounted on the bottom of the buzzer (141), the rectangular plate (144) is slidably mounted inside the rectangular frame (143), the rotating rod (145) rotates and penetrates the inner and outer walls of the rectangular plate (144), the L-shaped plate (146) is fixedly mounted on the surface of the rotating rod (145), the outer side wall of the rectangular frame (143) is provided with a through groove, the rotating rod (145) contacts the inner wall of the through groove, and a spiral spring is provided between the rotating rod (145) and the rectangular plate (144).

8. The sensor durability testing device according to claim 7, characterized in that: A sliding seat (147) is fixedly mounted on the surface of the rectangular frame (143), a convex rod (148) is slidably mounted inside the sliding seat (147), and a limiting plate (149) is fixedly mounted on the circumferential surface of the convex rod (148).

9. A method for using a sensor durability testing device, using the sensor durability testing device according to claim 8, characterized in that: The following steps are involved: Step 1: Start the heating device (2), the insulation wire on the heating device (2) starts to heat up, and the insulation wire increases the temperature in the insulation chamber (3); Step 2: The output end of the electric push rod drives the long rod (4) to move upward, the long rod (4) moves and drives the hollow cylinder (5) to move upward, and the hollow cylinder (5) moves and drives the placement rack (6) to move out of the insulation chamber (3); Step 3: Place the sensor to be tested in the placement rack (6) from top to bottom. After placement, the output end of the electric push rod drives the long rod (4) to move down to the starting position; Step 4: After the placement rack (6) moves to the starting position, the high-temperature gas in the heat preservation chamber (3) contacts the sensor to perform a high-temperature durability test.

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