Device and method for testing gas sensitivity of ceramic chip of nitrogen-oxygen sensor

Abstract

The invention discloses a device and a method for testing the gas sensitivity of a nitrogen-oxygen sensor ceramic chip, and relates to the technical field of sensor testing devices. The testing device for the gas sensitivity of the nitrogen-oxygen sensor ceramic chip comprises a base on which a monitor is mounted, and further comprises a supporting plate which is arranged on the base and is fixedly provided with a fixed seat, and the fixed seat is provided with a contact connected with the monitor; the device comprises a base and a top frame fixedly connected to the base, lifting equipment is fixedly installed on the top frame, a cover shell covering the top of the base is fixedly installed at the telescopic end of the lifting equipment, a hollow disc is arranged in the cover shell in a sleeved mode, and an air supply hole used for exhausting is formed in the lower end of the hollow disc. A driving part for driving the hollow disc to rotate and lift is arranged in the housing, and a waste gas hole is formed in the outer wall of the lower end of the housing; according to the invention, the nitrogen-oxygen sensor ceramic chip can be tested in different and complex environments, so that the test result is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of sensor testing devices, and in particular relates to a device for testing the gas sensitivity of a nitrogen and oxygen sensor ceramic chip. Background Art

[0002] Nitrogen oxide (NOx) sensor ceramic chips are core components used to detect nitrogen oxide (NOx) concentrations in gases and are widely used in applications such as automotive exhaust emissions monitoring and ambient air quality monitoring. These sensors typically operate based on electrochemical or optical principles, with electrochemical NOx sensors being the most common. During production, to ensure product quality, NOx sensor ceramic chips are routinely tested for gas sensitivity.

[0003] In the existing technology, the test mainly involves placing the nitrogen oxide sensor ceramic chip in a sealed environment, then filling the environment with different concentrations of the detected gas, and then observing and recording the data transmitted by the nitrogen oxide sensor ceramic chip to the monitoring instrument to complete the chip gas sensitivity test. Since the environmental structure during the test is relatively simple, and in practice, nitrogen oxide sensors are used in various complex actual environments, the test results obtained deviate greatly from the actual situation, making it difficult to ensure the accuracy of the test. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a device for testing the gas sensitivity of a ceramic chip of a nitrogen and oxygen sensor that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] A device for testing the gas sensitivity of a nitrogen and oxygen sensor ceramic chip comprises a base, on which a monitor is mounted, and further comprises: a support plate arranged on the base, wherein a fixing seat is fixedly mounted on the support plate, and a contact connected to the monitor is provided on the fixing seat; a top frame fixedly connected to the base, wherein a lifting device is fixedly mounted on the top frame, and a cover covering the top of the base is fixedly mounted on the telescopic end of the lifting device, the cover being provided with a hollow disk, the lower end of the hollow disk being provided with an air supply hole for exhaust, the cover being provided with a drive unit for driving the hollow disk to rotate and lift, the lower end outer wall of the cover being provided with an exhaust hole, and the exhaust hole being provided with an electromagnetic valve.

[0007] Preferably, the driving part includes a driving motor fixedly mounted on the top of the cover shell, and the top of the cover shell is rotatably connected to a vertical tube extending to the top thereof, wherein a driving gear is fixedly mounted on the output shaft of the driving motor, and a driven gear meshing with the driving gear is fixedly mounted on the top of the vertical tube, and the vertical tube is connected to the hollow disk through a telescopic component.

[0008] Furthermore, the telescopic component includes a reciprocating screw rotatably connected to the top of the cover shell, and a passive gear meshing with the driven gear is fixedly installed on the top of the reciprocating screw, wherein a lifting plate is installed on the outer wall of the reciprocating screw, and a lifting tube is longitudinally slidably sleeved on the lower end of the vertical tube, and the lower end of the lifting tube is fixedly connected and communicated with the hollow disk, and the top of the lifting tube is rotatably connected to the lifting plate.

[0009] Furthermore, a gas tank is fixedly mounted on the base, an output end of the gas tank is fixedly connected to a gas supply pipe, an end of the gas supply pipe is fixedly connected to an end cap, and the end cap is rotatably connected to the top of the vertical pipe.

[0010] Preferably, the lower end of the hollow disk is fixedly connected to a branch pipe communicating therewith, the outer wall of the branch pipe is provided with a transverse hole, and a heating element is fixedly installed on the outer wall of the branch pipe.

[0011] Furthermore, a circular groove is provided on the base, the support plate is sleeved in the upper end of the circular groove, and a lower spring is installed between the support plate and the inner bottom of the circular groove. When the branch pipe moves downward following the hollow disk, the branch pipe will press against the upper end surface of the support plate.

[0012] Furthermore, a sleeve is longitudinally sleeved on the bottom of the branch pipe, a roller is rotatably installed on the lower end of the sleeve, an upper spring is installed between the inner bottom of the sleeve and the lower end of the branch pipe, the elastic force of the upper spring is greater than the elastic force of the lower spring, and the outer wall of the branch pipe is fixedly connected to the locking plate located on the top of the roller.

[0013] Preferably, a telescopic device is fixedly installed on the outer wall of the cover shell, and a ring is fixedly installed on the telescopic end of the telescopic device and is sleeved on the outer wall of the cover shell. The inner wall of the ring is provided with an annular groove, and the top of the cover shell is fixedly connected to a protective cover covering the outer wall of the drive motor, and the outer wall of the protective cover is provided with a heat dissipation hole, and a heat dissipation pipe extending into the protective cover is fixedly connected in the annular groove.

[0014] Furthermore, a lower hole is provided in the middle of the lower end of the support plate, an L-shaped hole extending into the lower hole is provided at the upper end of the support plate, and air outlet holes extending to its lower end surface are provided around the upper end of the support plate, and one-way valves are fixedly installed in the air outlet hole and the L-shaped hole.

[0015] A method for testing the gas sensitivity of a nitrogen and oxygen sensor ceramic chip comprises the following steps:

[0016] S1. Fix the nitrogen oxide sensor ceramic chip to be tested on the fixing seat and cover it with a cover;

[0017] S2. Discharge the test gas in the gas tank into the housing;

[0018] S3, so that the test gas content in the cover will maintain a stable concentration, and the air pressure in the cover will fluctuate;

[0019] S4, gradually raising the temperature inside the housing;

[0020] S5. Subjecting the nitrogen oxide sensor ceramic chip under test to shaking and reciprocating rotation;

[0021] S6. Check and record the test data displayed on the monitor.

[0022] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0023] 1. The present invention generates negative pressure in the cavity at the bottom of the housing by moving the hollow disk upward. When the hollow disk moves downward, it compresses the gas in the housing. At this time, the data detected by the nitrogen oxide sensor ceramic chip will remain basically unchanged. If the change is too large, it is judged that the quality of the nitrogen oxide sensor ceramic chip is poor. Therefore, the nitrogen oxide sensor ceramic chip can be tested in different and complex environments, making the test results more accurate.

[0024] 2. The present invention heats the gas in the cover through a heating element, and the rotating hollow disk enables the heating element to heat the gas efficiently and evenly. At this time, the nitrogen oxide sensor ceramic chip can be tested in different temperature environments and in different pressure environments. This will make the test environment of the nitrogen oxide sensor ceramic chip more complex, which is more in line with the actual complex use environment, and thus can further ensure the test accuracy of the nitrogen oxide sensor ceramic chip.

[0025] 3. In the present invention, the hollow disk moves up and down, which drives the support plate to vibrate up and down in the circular groove. The support plate then drives the nitrogen oxide sensor ceramic chip on the fixed seat to vibrate up and down, thereby simulating the nitrogen oxide sensor ceramic chip in a vibrating working environment. Combined with the above-mentioned different air pressures and temperatures, the test process will be closer to the actual situation, thereby improving the accuracy of the test.

[0026] 4. The present invention rotates and lifts the hollow disk to cause the support plate to vibrate up and down and reciprocate in the circular groove, thereby causing the nitrogen oxide sensor ceramic chip to vibrate and reciprocate, so that the nitrogen oxide sensor ceramic chip is subjected to a complex environment closer to the actual environment, making the result more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the attached figure:

[0028] Figure 1 This is a schematic diagram of the axonometric structure of a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip proposed by the present invention;

[0029] Figure 2 This is a partial isometric structural diagram of a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip proposed by the present invention;

[0030] Figure 3 This is a schematic diagram of the partial cross-section structure of a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip proposed by the present invention;

[0031] Figure 4 This is a schematic diagram of the isometric structure of a cover of a device for testing the gas sensitivity of a nitrogen and oxygen sensor ceramic chip proposed by the present invention;

[0032] Figure 5 This is a schematic diagram of the isometric structure of the base of a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip proposed by the present invention;

[0033] Figure 6 This is a schematic diagram of the hollow disk axonometric structure of a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip proposed by the present invention;

[0034] Figure 7 This is a schematic diagram of the branch pipe axonometric structure of a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip proposed by the present invention;

[0035] Figure 8 This is a schematic diagram of the cross-sectional structure of a support plate of a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip proposed by the present invention.

[0036] In the figure: 1. base; 2. monitor; 3. support plate; 4. fixing seat; 5. cover; 6. top frame; 7. lifting device; 8. gas tank; 9. hollow disk; 10. lifting tube; 11. vertical tube; 12. driving motor; 13. driving gear; 14. driven gear; 15. reciprocating screw; 16. lifting plate; 17. air supply hole; 18. branch pipe; 19. horizontal hole; 20. heating element; 21. sleeve; 22. upper spring; 23. roller; 24. locking plate; 25. circular groove; 26. lower spring; 27. lower hole; 28. L-shaped hole; 29. air outlet; 30. end cover; 31. exhaust hole; 32. collar; 33. annular groove; 34. heat pipe; 35. protective cover; 36. heat dissipation hole; 37. telescopic device; 38. passive gear; 39. air supply pipe. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0038] Example 1: Reference Figures 1-8 A test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip comprises a base 1, on which is mounted a monitor 2 for monitoring data on the nitrogen and oxygen sensor ceramic chip, that is, gas concentration or content data detected by the nitrogen and oxygen sensor ceramic chip; and further comprises: a disc-shaped support plate 3 arranged on the base 1, wherein a fixing seat 4 for fixing the nitrogen and oxygen sensor ceramic chip is fixedly mounted on the support plate 3, the fixing seat 4 being provided with contacts connected to the monitor 2, the contacts being used to connect with contacts on the nitrogen and oxygen sensor ceramic chip; a top frame 6 fixedly connected to the base 1, wherein a lifting device 7 is fixedly mounted on the top frame 6, the lifting device 7 being an electric telescopic rod, the telescopic end of the lifting device 7 being fixedly mounted with a cover 5 covering the top of the base 1, a hollow disk 9 being provided inside the cover 5, an air supply hole 17 for exhaust being provided at the lower end of the hollow disk 9, a driving unit for driving the hollow disk 9 to rotate and lift being provided inside the cover 5, an exhaust hole 31 being provided on the outer wall of the lower end of the cover 5, and an electromagnetic valve being installed in the exhaust hole 31.

[0039] Specifically, the cover 5 is driven upward by the lifting device 7, and then the nitrogen oxide sensor ceramic chip to be tested is fixed on the fixing seat 4. The cover 5 is then driven by the lifting device 7 to cover the base 1. At this time, the monitor 2 can monitor the data on the nitrogen oxide sensor ceramic chip in real time, and then the test gas enters the hollow disk 9 and is finally discharged into the cover 5 from the gas supply hole 17. At this time, the excess gas in the cover 5 will be discharged through the exhaust hole 31, and the concentration of the test gas in the cover 5 will gradually increase. During this period, the nitrogen oxide sensor ceramic chip will detect different concentration data and display it through the monitor 2. When the concentration data gradually increases, it is judged that the quality of the nitrogen oxide sensor ceramic chip is good, otherwise it is poor. During the test, the hollow disk 9 can be rotated and lifted up and down in the cover 5 by the driving part, and the air pressure in the cover 5 will change, so that the nitrogen oxide sensor ceramic chip can be tested under different and complex environments, making the test results more accurate.

[0040] A telescopic device 37 is fixedly installed on the outer wall of the above-mentioned cover shell 5. The telescopic device 37 is an electric telescopic rod. The telescopic end of the telescopic device 37 is fixedly installed with a ring 32 that is sleeved on the outer wall of the cover shell 5. The inner wall of the ring 32 is provided with an annular groove 33. The top of the cover shell 5 is fixedly connected to a protective cover 35 that covers the outer wall of the drive motor 12. The outer wall of the protective cover 35 is provided with a heat dissipation hole 36. The annular groove 33 is fixedly connected to a heat dissipation pipe 34 that extends into the protective cover 35.

[0041] When the exhaust hole 31 needs to be exhausted, the telescopic device 37 drives the ring 32 to move downward until the exhaust end of the exhaust hole 31 faces the annular groove 33, and the exhausted exhaust gas will enter the annular groove 33 and enter the protective cover 35 through the heat dissipation pipe 34, and finally be discharged from the heat dissipation hole 36. When the air flow passes through the protective cover 35, the drive motor 12 in the protective cover 35 can be cooled to ensure the stability of the drive motor 12. When the exhaust hole 31 is not needed to be exhausted, the telescopic device 37 drives the ring 32 to move upward until the inner wall of the ring 32 can block the exhaust hole 31.

[0042] Example 2: Reference Figures 1-4 as well as Figure 6 A device for testing the gas sensitivity of a ceramic chip of a nitrogen and oxygen sensor is basically the same as that of Example 1, further comprising: the driving portion includes a driving motor 12 fixedly mounted on the top of a cover 5, the top of the cover 5 being rotatably connected to a vertical tube 11 extending to the top thereof, wherein a driving gear 13 is fixedly mounted on the output shaft of the driving motor 12, a driven gear 14 meshingly connected to the driving gear 13 is fixedly mounted on the top of the vertical tube 11, and the vertical tube 11 is connected to the hollow disk 9 via a telescopic component.

[0043] During the period of delivering gas into the cover shell 5, the drive motor 12 is turned on, and the drive motor 12 will drive the driven gear 14 to rotate through the driving gear 13. The driven gear 14 will drive the lifting tube 10 to rotate through the vertical tube 11. The lifting tube 10 will drive the hollow disk 9 to rotate. The hollow disk 9 will drive the air supply hole 17 to revolve around the axis of the cover shell 5. In this way, the exhausted gas can be more evenly filled and mixed into the cover shell 5, making the gas concentration data detected by the ceramic chip of the nitrogen and oxygen sensor more accurate.

[0044] A gas tank 8 for storing test gas is fixedly installed on the above-mentioned base 1. The gas can be a mixture of oxygen, nitrogen and the other two gases. The output end of the gas tank 8 is fixedly connected to the gas supply pipe 39, and the end of the gas supply pipe 39 is fixedly connected to the end cover 30. The end cover 30 is rotatably connected to the top of the vertical pipe 11.

[0045] Specifically, when gas needs to be transported into the cover 5, the valve on the gas tank 8 is opened, so that the test gas in the gas tank 8 is transported to the vertical pipe 11 through the gas supply pipe 39, then enters the lifting pipe 10, and then enters the hollow disk 9, and finally discharged into the cover 5 from the gas supply hole 17.

[0046] Example 3: Reference Figure 3 and Figure 6, a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip is basically the same as that of Example 2, further comprising: the above-mentioned telescopic component includes a reciprocating screw 15 rotatably connected to the top of the cover shell 5, and a passive gear 38 meshing with a driven gear 14 is fixedly mounted on the top of the reciprocating screw 15, wherein a lifting plate 16 is mounted on the outer wall of the reciprocating screw 15, and a lifting tube 10 is longitudinally slidably sleeved on the lower end of the vertical tube 11, and the lower end of the lifting tube 10 is fixedly connected to and communicated with the hollow disk 9, and the top of the lifting tube 10 is rotatably connected to the lifting plate 16.

[0047] Specifically, when the driven gear 14 rotates, the driven gear 14 will also drive the reciprocating screw 15 to rotate through the driven gear 38, and the reciprocating screw 15 will drive the lifting plate 16 to move up and down, and the lifting plate 16 will drive the lifting tube 10 and the hollow disk 9 to move up and down, and the hollow disk 9 will drive the air supply hole 17 to move up and down synchronously, so that the gas discharged from the air supply hole 17 can be more evenly mixed into the cover 5, so that the data detected by the nitrogen oxide sensor ceramic chip can be more accurate.

[0048] Example 4: Reference Figure 3 as well as Figure 5-Figure 8 , a test device for the gas sensitivity of a nitrogen and oxygen sensor ceramic chip is basically the same as Example 3, further comprising: a branch pipe 18 is fixedly connected to the lower end of the hollow disk 9 and communicated with the branch pipe 18, a transverse hole 19 is provided on the outer wall of the branch pipe 18, and a heating element 20 is fixedly installed on the outer wall of the branch pipe 18.

[0049] Specifically, the gas in the hollow disk 9 can enter the branch pipe 18 and then be discharged from the horizontal hole 19. The rotating hollow disk 9 will drive the branch pipe 18 to revolve around its axis, so that the gas can be discharged into the cover 5 more evenly, and the heating element 20 on the branch pipe 18 can evenly heat the gas.

[0050] A circular groove 25 is provided on the above-mentioned base 1, and the support plate 3 is arranged in the upper end of the circular groove 25. A lower spring 26 is installed between the support plate 3 and the inner bottom of the circular groove 25. When the branch pipe 18 moves downward following the hollow disk 9, the branch pipe 18 will press against the upper end surface of the support plate 3.

[0051] Specifically, when the hollow disk 9 moves downward, the hollow disk 9 will drive the branch tube 18 to press on the support plate 3, and the support plate 3 will slide into the circular groove 25 under the action of the top pressure. When the hollow disk 9 drives the branch tube 18 to reset upward, the support plate 3 is not subject to the top pressure of the branch tube 18, so the lower spring 26 will drive the support plate 3 to lift up and reset in the circular groove 25. Therefore, the reciprocating hollow disk 9 will also cause the support plate 3 to shake up and down in the circular groove 25, and the support plate 3 will drive the nitrogen oxide sensor ceramic chip on the fixed seat 4 to shake up and down to simulate the nitrogen oxide sensor ceramic chip in a vibrating working environment. Combined with the above-mentioned different air pressures and temperatures, the test process will be closer to reality, thereby improving the accuracy of the test.

[0052] A sleeve 21 is longitudinally sleeved on the bottom of the branch pipe 18, and a roller 23 is rotatably installed on the lower end of the sleeve 21. An upper spring 22 is installed between the inner bottom of the sleeve 21 and the lower end of the branch pipe 18. The elastic force of the upper spring 22 is greater than the elastic force of the lower spring 26. The outer wall of the branch pipe 18 is fixedly connected to the locking plate 24 located on the top of the roller 23, and the outer wall of the locking plate 24 and the outer wall of the roller 23 are both provided with anti-slip grooves.

[0053] Specifically, when the branch pipe 18 moves downward, the branch pipe 18 will press the roller 23 downward on the support plate 3, and the lower spring 26 will be compressed first. After the lower spring 26 is compressed to the limit position, the upper spring 22 will be compressed, and the sleeve 21 will slide toward the top of the branch pipe 18, so the roller 23 will also slide upward, and the roller 23 will eventually press on the locking plate 24, and the roller 23 will not be able to rotate on the support plate 3. The resistance between the roller 23 and the support plate 3 will increase, and the rotating space The core disk 9 will push the support plate 3 to rotate in the circular groove 25 through the roller 23. When the branch pipe 18 drives the roller 23 away from the support plate 3, the support plate 3 is no longer subject to the thrust of the roller 23, and the lower spring 26 will drive the support plate 3 to reverse and reset in the circular groove 25. Therefore, rotating and lifting the hollow disk 9 will cause the support plate 3 to shake up and down and rotate back and forth in the circular groove 25, thereby causing the nitrogen oxide sensor ceramic chip to shake and rotate back and forth, so that the nitrogen oxide sensor ceramic chip is subjected to a complex environment that is closer to the actual environment, making the result more accurate at this time.

[0054] A lower hole 27 is provided in the middle of the lower end of the above-mentioned support plate 3, and an L-shaped hole 28 extending into the lower hole 27 is provided at the upper end of the support plate 3. Air outlet holes 29 extending to its lower end surface are provided around the upper end of the support plate 3, and one-way valves are fixedly installed in the air outlet holes 29 and the L-shaped holes 28.

[0055] Specifically, when the support plate 3 slides toward the bottom of the circular groove 25, the air at the bottom of the circular groove 25 will be discharged through the air outlet 29. When the support plate 3 slides upward in the circular groove 25 to reset, negative pressure will be generated in the circular groove 25 and the air in the cover 5 will be sucked in through the L-shaped hole 28. The raised and lowered support plate 3 will allow the air in the cover 5 to enter the circular groove 25, so that the heated gas can enter the circular groove 25 and heat the support plate 3, so that the temperatures of the upper and lower surfaces of the nitrogen oxide sensor ceramic chip remain basically consistent, reducing the temperature difference between the upper and lower surfaces and improving the test accuracy.

[0056] Example 5: Reference Figures 1-8 A method for testing the gas sensitivity of a nitrogen and oxygen sensor ceramic chip comprises the following steps:

[0057] S1. Fix the nitrogen oxide sensor ceramic chip to be tested on the fixing seat 4 and cover it with the cover 5;

[0058] S2, discharge the test gas in the gas tank 8 into the housing 5;

[0059] S3, the test gas content in the housing 5 is kept at a stable concentration, and the air pressure in the housing 5 is made to fluctuate;

[0060] S4, gradually raising the temperature inside the housing 5;

[0061] S5. Subjecting the nitrogen oxide sensor ceramic chip under test to shaking and reciprocating rotation;

[0062] S6. Check and record the test data displayed on the monitor 2.

[0063] When the present invention is in use, the cover 5 is moved upward by the lifting device 7, and then the nitrogen oxide sensor ceramic chip to be tested is fixed on the fixing seat 4. The cover 5 is then covered on the base 1 by the lifting device 7. At this time, the monitor 2 can monitor the data on the nitrogen oxide sensor ceramic chip in real time, and then the valve on the gas tank 8 is opened to allow the test gas in the gas tank 8 to be transported to the vertical pipe 11 through the gas supply pipe 39, and then enter the lifting pipe 10, and then enter the hollow disk 9, and finally discharged into the cover 5 from the gas supply hole 17. At this time, the excess gas in the cover 5 will be discharged through the exhaust hole 31, and the concentration of the test gas in the cover 5 will gradually increase. During this period, the nitrogen oxide sensor ceramic chip will detect different concentration data and display it through the monitor 2. When the concentration data gradually increases, it is judged that the quality of the nitrogen oxide sensor ceramic chip is good, otherwise it is poor.

[0064] During the period of delivering gas into the cover shell 5, the drive motor 12 is turned on, and the drive motor 12 will drive the driven gear 14 to rotate through the driving gear 13. The driven gear 14 will drive the lifting tube 10 to rotate through the vertical tube 11, and the lifting tube 10 will drive the hollow disk 9 to rotate. The hollow disk 9 will drive the air supply hole 17 to revolve around the axis of the cover shell 5, so that the exhausted gas can be more evenly filled and mixed into the cover shell 5, so that the gas concentration data detected by the nitrogen oxide sensor ceramic chip is more accurate. When the driven gear 14 rotates, the driven gear 14 will also drive the reciprocating screw 15 to rotate through the passive gear 38. The reciprocating screw 15 will drive the lifting plate 16 to move up and down, and the lifting plate 16 will drive the lifting tube 10 and the hollow disk 9 to move up and down, and the hollow disk 9 will drive the air supply hole 17 to move synchronously, so that the gas discharged from the air supply hole 17 can be more evenly mixed into the cover shell 5, so that the data detected by the nitrogen oxide sensor ceramic chip is more accurate.

[0065] Close the valves in the gas tank 8 and the exhaust hole 31, and the gas in the gas tank 8 will no longer enter the cover 5. The test gas content in the cover 5 will maintain a stable concentration. At this time, the upward moving hollow disk 9 will cause the cavity at the bottom of the cover 5 to generate negative pressure. At this time, the data detected by the nitrogen oxide sensor ceramic chip will remain basically unchanged. If the change is too large, it is judged that the quality of the nitrogen oxide sensor ceramic chip is poor; when the hollow disk 9 moves downward, the hollow disk 9 will compress the gas in the cover 5. At this time, the data detected by the nitrogen oxide sensor ceramic chip will remain basically unchanged. If the change is too large, it is judged that the quality of the nitrogen oxide sensor ceramic chip is poor. Therefore, the nitrogen oxide sensor ceramic chip can be tested in different and complex environments, making the test results more accurate.

[0066] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A device for testing the gas sensitivity of a nitrogen and oxygen sensor ceramic chip, comprising a base (1), a monitor (2) being mounted on the base (1), and characterized in that: Also includes: A support plate (3) is provided on the base (1), A fixing seat (4) is fixedly mounted on the support plate (3), and a contact connected to the monitor (2) is provided on the fixing seat (4); A top frame (6) fixedly connected to the base (1), A lifting device (7) is fixedly mounted on the top frame (6), a cover (5) covering the top of the base (1) is fixedly mounted on the telescopic end of the lifting device (7), a hollow disk (9) is provided inside the cover (5), an air supply hole (17) for exhaust is provided at the lower end of the hollow disk (9), a driving unit for driving the hollow disk (9) to rotate and lift is provided inside the cover (5), an exhaust hole (31) is provided on the outer wall of the lower end of the cover (5), and a solenoid valve is installed in the exhaust hole (31).

2. The gas sensitivity testing device of a nitrogen and oxygen sensor ceramic chip according to claim 1 is characterized in that: The driving unit includes a driving motor (12) fixedly mounted on the top of the housing (5), and the top of the housing (5) is rotatably connected to a vertical pipe (11) extending to the top of the housing. The output shaft of the driving motor (12) is fixedly mounted with a driving gear (13), the top of the vertical tube (11) is fixedly mounted with a driven gear (14) meshingly connected with the driving gear (13), and the vertical tube (11) is connected to the hollow disk (9) via a telescopic component.

3. The gas sensitivity testing device of a nitrogen and oxygen sensor ceramic chip according to claim 2, characterized in that: The telescopic component includes a reciprocating screw (15) rotatably connected to the top of the housing (5), and a driven gear (38) meshingly connected to the driven gear (14) is fixedly mounted on the top of the reciprocating screw (15). The outer wall of the reciprocating screw (15) is provided with a lifting plate (16), the lower end of the vertical tube (11) is longitudinally slidably sleeved with a lifting tube (10), the lower end of the lifting tube (10) is fixedly connected to and communicated with the hollow disk (9), and the top of the lifting tube (10) is rotatably connected to the lifting plate (16).

4. The gas sensitivity testing device of a nitrogen and oxygen sensor ceramic chip according to claim 3 is characterized in that: A gas tank (8) is fixedly mounted on the base (1); an output end of the gas tank (8) is fixedly connected to a gas supply pipe (39); an end of the gas supply pipe (39) is fixedly connected to an end cover (30); and the end cover (30) is rotatably connected to the top of the vertical pipe (11).

5. The gas sensitivity testing device of a nitrogen and oxygen sensor ceramic chip according to claim 1, characterized in that: The lower end of the hollow disk (9) is fixedly connected to a branch pipe (18) communicating therewith, the outer wall of the branch pipe (18) is provided with a transverse hole (19), and a heating element (20) is fixedly installed on the outer wall of the branch pipe (18).

6. The gas sensitivity testing device of a nitrogen and oxygen sensor ceramic chip according to claim 5, characterized in that: The base (1) is provided with a circular groove (25), the support plate (3) is sleeved in the upper end of the circular groove (25), and a lower spring (26) is installed between the support plate (3) and the inner bottom of the circular groove (25). When the branch pipe (18) moves downward following the hollow disk (9), the branch pipe (18) presses against the upper end surface of the support plate (3).

7. The gas sensitivity testing device of a nitrogen and oxygen sensor ceramic chip according to claim 5, characterized in that: The bottom of the branch pipe (18) is longitudinally sleeved with a sleeve (21), the lower end of the sleeve (21) is rotatably mounted with a roller (23), an upper spring (22) is mounted between the inner bottom of the sleeve (21) and the lower end of the branch pipe (18), the elastic force of the upper spring (22) is greater than the elastic force of the lower spring (26), and the outer wall of the branch pipe (18) is fixedly connected to a locking plate (24) located on the top of the roller (23).

8. The gas sensitivity testing device for nitrogen and oxygen sensor ceramic chips according to claim 1, characterized in that: A telescopic device (37) is fixedly mounted on the outer wall of the cover shell (5); a sleeve (32) sleeved on the outer wall of the cover shell (5) is fixedly mounted on the telescopic end of the telescopic device (37); an annular groove (33) is provided on the inner wall of the sleeve (32); a protective cover (35) covering the outer wall of the drive motor (12) is fixedly connected to the top of the cover shell (5); a heat dissipation hole (36) is provided on the outer wall of the protective cover (35); and a heat dissipation pipe (34) extending into the protective cover (35) is fixedly connected in the annular groove (33).

9. The gas sensitivity testing device of a nitrogen and oxygen sensor ceramic chip according to claim 6, characterized in that: A lower hole (27) is provided in the middle of the lower end of the support plate (3), an L-shaped hole (28) extending into the lower hole (27) is provided at the upper end of the support plate (3), and air outlet holes (29) extending to the lower end surface thereof are provided around the upper end of the support plate (3), and one-way valves are fixedly installed in the air outlet holes (29) and the L-shaped hole (28).

10. A method for testing the gas sensitivity of a nitrogen and oxygen sensor ceramic chip, characterized in that: The gas sensitivity testing device of a nitrogen and oxygen sensor ceramic chip as claimed in claim 4 comprises the following steps: S1. Fix the nitrogen and oxygen sensor ceramic chip to be tested on the fixing seat (4) and cover it with a cover (5); S2, discharging the test gas in the gas tank (8) into the housing (5); S3, maintaining a stable concentration of the test gas content in the housing (5) and causing the gas pressure in the housing (5) to fluctuate; S4, gradually raising the temperature inside the housing (5); S5. Subjecting the nitrogen oxide sensor ceramic chip under test to shaking and reciprocating rotation; S6. Check and record the test data displayed on the monitor (2).

Images