A device for testing the performance of a nitrogen oxide sensor

Abstract

The utility model discloses a kind of nitrogen oxygen sensor performance testing device, it is related to sensor testing equipment, including base, two sliding sleeves are fixed on base, sliding sleeve is slidably installed with slide, and spring is equipped between the bottom of slide and the bottom of sliding sleeve inner cavity, fixed frame for installing exhaust pipe is fixed on slide;Base is equipped with containing groove between two sliding sleeves, rotating rod is rotatably installed in containing groove, and rotating rod is connected by pull rope between fixed frame;Supporting column is fixed on base, first measuring plate for measuring the installation height of probe main body installed in exhaust pipe is movably installed in supporting column, and protective sleeve for sealing test of the connecting place of probe main body and exhaust pipe is equipped on first measuring plate.The utility model can simultaneously carry out vibration test and sealing test to the probe of nitrogen oxygen sensor, and the device structure is simple, easy to operate, and test result is effective and reliable.

Description

Technical Field

[0001] This utility model relates to sensor testing equipment, and more specifically, to a nitrogen and oxygen sensor performance testing device. Background Technology

[0002] The development of nitrogen oxide sensors helps improve the performance of engine emission control systems by accurately detecting nitrogen oxides in exhaust gases, thereby raising emission standards for vehicles and industrial equipment. Existing nitrogen oxide sensor designs typically include a probe, wiring, and a control module, with the wiring connecting the probe and the control module. The probe is installed in the exhaust pipe, and the detected data is transmitted to the control module via specific wiring, enabling real-time data monitoring and processing.

[0003] The existing nitrogen oxide sensor probes are typically fixed to the exhaust pipe using a threaded connection. This connection relies on precise thread matching and good machining quality to ensure the probe maintains tight contact even under high vibration environments. However, if the threads are mismatched or there are defects in the machining process, the connection between the probe and the exhaust pipe will become unstable, potentially causing the probe to detach due to vibration or impact, thus affecting the normal operation and measurement accuracy of the sensor. Therefore, during the production and installation of nitrogen oxide sensors, it is generally necessary to conduct some performance tests on the nitrogen oxide sensor probes, mainly including vibration testing and sealing testing.

[0004] Current testing methods typically employ a dedicated device for each test. This method requires the nitrogen and oxygen sensor probe to be transferred between different devices and frequently disassembled. However, frequent transfer and disassembly increase the risk of damage to the nitrogen and oxygen sensor probe, such as collisions or drops during transfer, or stripping of threads or damage to bolts caused by disassembly. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a nitrogen and oxygen sensor performance testing device that addresses the shortcomings of the existing technology. This device can simultaneously perform vibration and sealing tests on the probe of the nitrogen and oxygen sensor. Moreover, the device has a simple structure, is easy to operate, and the test results are effective and reliable.

[0006] The present invention discloses a nitrogen-oxygen sensor performance testing device, comprising a base, two sliding sleeves fixed on the base, a sliding plate slidably mounted in the sliding sleeves, and a spring provided between the bottom of the sliding plate and the bottom of the inner cavity of the sliding sleeve. A fixing bracket for mounting an exhaust pipe is fixed on the sliding plate, and the exhaust pipe has a mounting position for mounting the probe body of the nitrogen-oxygen sensor. A receiving groove is opened in the base between the two sliding sleeves, and a rotating rod is rotatably mounted in the receiving groove. The rotating rod is connected to the fixing bracket by a pull rope. A support column is fixed on the base, and a first measuring plate for measuring the mounting height of the probe body installed in the exhaust pipe is movably mounted in the support column. The first measuring plate is provided with a protective sleeve for performing a sealing test at the connection between the probe body and the exhaust pipe.

[0007] Preferably, a measuring groove is provided inside the support column, and scale lines are provided on the side wall of the measuring groove. A first measuring plate is slidably installed in the measuring groove, and a threaded rod extending into the measuring groove is rotatably installed in the support column. The threaded rod is threadedly connected to the first measuring plate.

[0008] Preferably, a second measuring plate is rotatably mounted on the end of the first measuring plate, and a protective sleeve is fixed on one side of the second measuring plate, the lower end face of which matches the shape of the outer wall of the exhaust pipe.

[0009] Preferably, limiting plates that can abut against the sides of the second measuring plate are rotatably mounted on both sides of the end of the first measuring plate.

[0010] Preferably, the lower end face of the protective sleeve is also provided with a sealing gasket.

[0011] Preferably, each of the two sliding sleeves is provided with a support plate on its side wall, and each of the two support plates is provided with a sealing cover that matches the exhaust pipe opening, and an intake pipe is connected to one of the sealing covers.

[0012] Preferably, a second fixing bolt is threaded onto the support plate, and the end of the second fixing bolt is rotatably connected to the sealing cover.

[0013] Preferably, a support plate that matches the shape of the bottom of the sealing cover is fixed on the support plate.

[0014] Preferably, the fixing frame is threaded with a plurality of first fixing bolts.

[0015] Beneficial effects The advantages of this invention are as follows: Through the design of a vibration simulation device, a measuring device, and a leakage detection device, this device can simultaneously perform vibration and sealing tests on the probe of a nitrogen-oxygen sensor. It can not only detect whether the probe will loosen slightly during vibration, but also simulate the sealing test of the probe after use in a vibration environment. Furthermore, the device has a simple structure, is easy to operate, and provides effective and reliable test results. Attached Figure Description

[0016] Figure 1 This is a first-view structural schematic diagram of the nitrogen and oxygen sensor performance testing device of this utility model; Figure 2 for Figure 1 Enlarged structural diagram at point A; Figure 3 This is a second-view structural schematic diagram of the nitrogen and oxygen sensor performance testing device of this utility model; Figure 4 This is a schematic diagram of the first usage state of the nitrogen and oxygen sensor performance testing device of this utility model; Figure 5 This is a schematic diagram of the second usage state of the nitrogen and oxygen sensor performance testing device of this utility model; Figure 6 This is a top view of the protective sleeve portion of the nitrogen and oxygen sensor performance testing device of this utility model.

[0017] The components are as follows: 11. Base; 12. Support leg; 13. Fixing plate; 14. Exhaust pipe; 15. Probe body; 21. Sliding sleeve; 22. Slide plate; 23. Fixing frame; 24. First fixing bolt; 25. Receiving groove; 26. Rotating rod; 27. Pull rope; 28. Connecting plate; 281. Fixing ring; 31. Support column; 32. Measuring groove; 33. Threaded rod; 34. First measuring plate; 35. Second measuring plate; 36. Protective sleeve; 37. Limiting plate; 41. Support plate; 42. Sealing cover; 43. Second fixing bolt; 44. Air inlet pipe; 45. Support plate. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention. like Figures 1 to 6As shown, this utility model discloses a nitrogen-oxygen sensor performance testing device, including a base 11, and a simulated installation device, a simulated vibration device, a measuring device, and a leakage detection device mounted on the base 11. The simulated installation device can simulate the actual installation of the probe body 15 on the exhaust pipe 14, increasing the efficiency of subsequent actual installation of the probe body 15. The simulated vibration device can simulate the vibration generated by the probe body 15 during operation in a car or industrial equipment. The measuring device can measure the height of the probe body 15 after installation, and measure the height of the probe body 15 again after vibration by the simulated vibration device to detect whether the height of the probe body 15 has changed. The leakage detection device can detect whether the gas transported in the exhaust pipe 14 will leak from the connection between the probe body 15 and the exhaust pipe 14.

[0019] For the installation of the probe body 15, the probe body 15 is provided with external threads, and the exhaust pipe 14 is provided with threaded holes or threaded seats that match the external threads, so that the probe body 15 can be threadedly connected to the exhaust pipe 14.

[0020] The base 11 has multiple support legs 12 fixed to its bottom, and a fixing plate 13 is fixed to the bottom of the support legs 12. The fixing plate 13 has an insertion hole. The device can be fixed by bolts inserted into the insertion hole and screws pre-embedded and fixed to the ground, so as to ensure its stability when simulating vibration.

[0021] The specific structure of the simulation installation device is as follows: Two sliding sleeves 21 are fixed on the base 11. A sliding plate 22 is slidably installed in the sliding sleeve 21, and a spring is provided between the bottom of the sliding plate 22 and the bottom of the inner cavity of the sliding sleeve 21. A fixing bracket 23 is fixed on the sliding plate 22, and multiple first fixing bolts 24 are threaded onto the fixing bracket 23. The exhaust pipe 14 is placed in the fixing bracket 23, and the exhaust pipe 14 is tightened and fixed by tightening the first fixing bolts 24. When fixing the exhaust pipe 14, the threaded hole on the exhaust pipe 14 faces upward, and then the probe body 15 is threaded onto the exhaust pipe 14. The exhaust pipe 14 is the same pipe as that in automobiles or process equipment. By installing the probe body 15 on the exhaust pipe 14, the actual installation in automobiles or process equipment can be simulated.

[0022] The specific structure of the simulated vibration device is as follows: A connecting plate 28 is fixed between two sliding plates 22 below the fixed frame 23. A receiving groove 25 is provided in the base 11 between two sliding sleeves 21. A rotating rod 26 is rotatably installed in the receiving groove 25, and one end of the rotating rod 26 extends to the outside of the base 11. The rotating rod 26 is connected to the connecting plate 28 by a pull rope 27. Specifically, a fixing ring 281 is fixed to the bottom of the connecting plate 28, one end of the pull rope 27 is tied to the fixing ring 281, and the other end of the pull rope 27 is wrapped around the rotating rod 26.

[0023] When the rotating rod 26 is rotated, the pull rope 27 is wound around the rotating rod 26, pulling the connecting plate 28 downwards, which in turn moves the slide plate 22 downwards. As the slide plate 22 moves downwards, it compresses the spring. After the slide plate 22 moves downwards a certain distance, the rotating rod 26 is released, and the spring tension is released instantaneously. The spring then lifts the slide plate 22, causing the exhaust pipe 14 to vibrate during this process, thus simulating the vibration of a car or industrial equipment. When the vibration disappears, one vibration test of the probe body 15 is completed. The above operation can be repeated to perform multiple vibration tests on the probe body 15. After the test, the probe body 15 is inspected to check whether it has detached or become loose.

[0024] The measuring device in this embodiment includes a support column 31 fixed on a base 11, a measuring groove 32 is provided in the support column 31, a scale line is provided on the side wall of the measuring groove 32, a first measuring plate 34 is slidably installed in the measuring groove 32, and a threaded rod 33 extending into the measuring groove 32 is rotatably installed in the support column 31, and the threaded rod 33 is threadedly connected to the first measuring plate 34.

[0025] After the probe body 15 is installed onto the exhaust pipe 14, the threaded rod 33 is rotated, causing the first measuring plate 34 to move up and down until it abuts against the upper surface of the probe body 15. The installation height of the probe body 15 is then precisely measured using the scale lines. After a vibration test on the probe body 15, its height is measured again to check if the height has changed after the vibration test, preventing slight loosening of the probe body 15 that might not be visually noticeable. This embodiment uses a measuring device to accurately measure the height of the probe body 15 before and after the vibration test, greatly improving the accuracy of the detection.

[0026] The specific structure of the leak detection device is as follows: A second measuring plate 35 is rotatably mounted on the end of the first measuring plate 34. A protective sleeve 36 is fixed to one side of the second measuring plate 35. The lower end face of the protective sleeve 36 matches the shape of the outer wall of the exhaust pipe 14, and a sealing gasket is also provided on the lower end face of the protective sleeve 36 to prevent water from leaking from the connection between the protective sleeve 36 and the exhaust pipe 14. A support plate 41 is fixed to one side of one of the sliding sleeves 21, and a support plate 41 is detachably mounted on one side of the other sliding sleeve 21. This design is mainly to facilitate the installation and removal of the exhaust pipe 14. Both support plates 41 are provided with sealing covers 42 that match the opening of the exhaust pipe 14, and an air inlet pipe 44 is connected to one of the sealing covers 42.

[0027] To improve the sealing effect at the opening of the exhaust pipe 14, a second fixing bolt 43 is threaded onto the support plate 41 in this embodiment. The end of the second fixing bolt 43 is rotatably connected to the sealing cover 42. By rotating the second fixing bolt 43, the second fixing bolt 43 can push the sealing cover 42 to move in the direction of the opening of the exhaust pipe 14, so that the sealing cover 42 and the opening of the exhaust pipe 14 are tightly fitted. Moreover, a sealing gasket is provided on the sealing cover 42 to prevent gas from leaking from the connection between the sealing cover 42 and the exhaust pipe 14.

[0028] Preferably, a support plate 45 that matches the shape of the bottom of the sealing cover 42 is fixed on the support plate 41. The support plate 45 can support the sealing cover 42 and also facilitate its movement on the support plate 45.

[0029] Regarding the rotational mounting method of the second measuring plate 35, specifically, a shaft is fixed to one end of the second measuring plate 35 near the first measuring plate 34. A bearing is installed in the connection end between the first measuring plate 34 and the second measuring plate 35, and the shaft is fixed in the inner ring of the bearing, thus realizing the rotational mounting of the second measuring plate 35. Limiting plates 37, capable of abutting against the sides of the second measuring plate 35, are rotatably mounted on both sides of the end of the first measuring plate 34. More specifically, the distance between the two limiting plates 37 is slightly smaller than the width of the second measuring plate 35, so that when the limiting plates 37 rotate to such a position... Figure 2 In the position shown, the two limiting plates 37 can be locked at the ends of the second measuring plate 35. In order to allow the limiting plates 37 to rotate smoothly to the side of the second measuring plate 35, the lower edge of the limiting plates 37 near the second measuring plate 35 is chamfered.

[0030] When leakage detection is required, the protective sleeve 36 is flipped to the position corresponding to the probe body 15 via the second measuring plate 35, i.e., the protective sleeve 36 is located at the bottom of the second measuring plate 35. Then, the threaded rod 33 is rotated, causing the first measuring plate 34 and the second measuring plate 35 to move downwards, which in turn moves the protective sleeve 36 downwards until it is in full contact with the exhaust pipe 14. At this point, the probe body 15 is located inside the protective sleeve 36. Then, the sealing cover 42 is placed over both ends of the exhaust pipe 14 to seal it. After adding water into the protective sleeve 36 and ensuring there is no leakage, gas is introduced into the exhaust pipe 14 through the air inlet pipe 44. The air inlet pipe 44 can be connected to the exhaust pipeline in the factory for gas recycling, or a separate fan can be installed on the base 11, with the air inlet pipe 44 connected to the fan. When gas leaks from the connection between the probe body 15 and the exhaust pipe 14, the gas will generate bubbles in the water or the water will emit a flow, thus indicating that the probe body 15 is leaking. Otherwise, there is no leak.

[0031] The working principle of this utility model is as follows: In use, first fix the exhaust pipe 14 inside the mounting bracket 23, then install the probe body 15. Next, use the measuring device to first measure the height of the probe body 15 at this point. After the measurement is completed, ensure that the measuring device is away from the probe body 15. Then, by rotating the lever 26, the pull rope 27 can be wound up. During the winding process, the pull rope 27 can drive the exhaust pipe 14 and the slide plate 22 to move downwards. The slide plate 22 presses the spring downwards. After moving a certain distance, release the lever 26, and the tension of the spring is released instantly, thereby causing the exhaust pipe 14 to vibrate, thus performing a vibration test on the probe body 15.

[0032] After the vibration test is completed, the height of the probe body 15 is measured a second time using a measuring device. If the two measurements are consistent, it indicates that the probe body 15 is not loose, and a sealing test is performed. If the second measurement is greater than the first measurement, it indicates that the probe body 15 has become loose after vibration, and the test ends.

[0033] During the sealing test, the protective sleeve 36 is first placed around the probe body 15 to ensure a seal, and then the sealing cover 42 is placed over both ends of the exhaust pipe 14. After adding water into the protective sleeve 36, gas is introduced into the exhaust pipe 14 through the air inlet pipe 44. When gas leaks from the connection between the probe body 15 and the exhaust pipe 14, bubbles will form in the water or the water will flow out, indicating a leak in the probe body 15; otherwise, there is no leak.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. A nitrogen and oxygen sensor performance testing device, characterized in that, Includes a base (11), on which two sliding sleeves (21) are fixed. A sliding plate (22) is slidably installed in the sliding sleeve (21), and a spring is provided between the bottom of the sliding plate (22) and the bottom of the inner cavity of the sliding sleeve (21). A fixing bracket (23) for installing an exhaust pipe (14) is fixed on the sliding plate (22), and the exhaust pipe (14) is provided with a mounting position for installing the probe body (15) of the nitrogen and oxygen sensor. A receiving groove (23) located between the two sliding sleeves (21) is opened in the base (11). 5) A rotating rod (26) is rotatably installed in the receiving groove (25), and the rotating rod (26) is connected to the fixed frame (23) by a pull rope (27); a support column (31) is fixed on the base (11), and a first measuring plate (34) for measuring the installation height of the probe body (15) installed in the exhaust pipe (14) is movably installed in the support column (31). The first measuring plate (34) is provided with a protective sleeve (36) for performing a sealing test on the connection between the probe body (15) and the exhaust pipe (14).

2. The nitrogen and oxygen sensor performance testing device according to claim 1, characterized in that, The support column (31) has a measuring groove (32) inside, and the side wall of the measuring groove (32) has a scale line. A first measuring plate (34) is slidably installed in the measuring groove (32). A threaded rod (33) extending into the measuring groove (32) is rotatably installed in the support column (31). The threaded rod (33) is threadedly connected to the first measuring plate (34).

3. The nitrogen and oxygen sensor performance testing device according to claim 1, characterized in that, A second measuring plate (35) is rotatably mounted on the end of the first measuring plate (34), and a protective sleeve (36) is fixed on one side of the second measuring plate (35). The lower end face of the protective sleeve (36) matches the shape of the outer wall of the exhaust pipe (14).

4. The nitrogen and oxygen sensor performance testing device according to claim 3, characterized in that, The first measuring plate (34) has rotatably mounted on both sides of its end, and the limiting plates (37) are able to abut against both sides of the second measuring plate (35).

5. The nitrogen and oxygen sensor performance testing device according to claim 3, characterized in that, The lower end face of the protective sleeve (36) is also provided with a sealing gasket.

6. The nitrogen and oxygen sensor performance testing device according to claim 1, characterized in that, Support plates (41) are provided on the side walls of both sliding sleeves (21), and sealing covers (42) matching the exhaust pipe (14) are provided on both support plates (41). An air intake pipe (44) is connected to one of the sealing covers (42).

7. The nitrogen and oxygen sensor performance testing device according to claim 6, characterized in that, The support plate (41) is threaded with a second fixing bolt (43), and the end of the second fixing bolt (43) is rotatably connected to the sealing cover (42).

8. The nitrogen and oxygen sensor performance testing device according to claim 7, characterized in that, The support plate (41) is fixed with a tray (45) that matches the shape of the bottom of the sealing cover (42).

9. The nitrogen and oxygen sensor performance testing device according to claim 1, characterized in that, The fixing frame (23) is threaded with a plurality of first fixing bolts (24).

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