Double-temperature-zone combustion test board for oxygen sensor

Abstract

The utility model relates to the technical field of sensor test equipment, in particular to a double-temperature-zone combustion test board for an oxygen sensor, which is characterized in that a turntable and a servo motor for driving the turntable mounting seat to rotate are mounted on the turntable mounting seat, a plurality of finger cylinders are mounted on the turntable, and each finger cylinder forms a station; a product is clamped on each finger cylinder, and a pneumatic-electric integrated hybrid slip ring is mounted in the center of the turntable mounting seat; the up-down moving mechanism is installed below the workbench in the rack, and the top end of the up-down moving mechanism is provided with a rotating disc installation base which is used for driving the whole rotating disc to ascend and descend at the rotating station so as to prevent the product from colliding with the testing pipeline. The finger cylinder feeding and discharging efficiency is improved; a servo electric cylinder is used for driving, and a pneumatic-electric integrated mixed slip ring is adopted; the corrugated pipe is arranged on the testing pipeline, it is guaranteed that two products can enter the testing hole at the same time, the testing pipeline is supported through the jig, the detection precision is improved, and the 850-degree testing hole is close to the right side wall of the heating furnace and does not interfere with rotation of the rotating disc.

Description

Technical Field

[0001] This utility model relates to the field of sensor testing equipment technology, and in particular to a dual-temperature zone combustion test bench for oxygen sensors. Background Technology

[0002] Oxygen sensors are widely used in automotive engine control systems to monitor the oxygen content in exhaust emissions. By monitoring the oxygen concentration in the exhaust in real time, the engine control system can adjust parameters such as fuel injection quantity and ignition timing based on feedback signals, ensuring that the engine maintains the optimal air-fuel ratio under different operating conditions, improving fuel efficiency, and reducing harmful gas emissions.

[0003] In the existing technology, the published patent document CN216718339U, patent title: Continuous Dual Temperature Point Combustion Test Stand, has the following disadvantages:

[0004] 1. Inconvenient product loading and unloading: The existing products are placed in the product placement position, then pressed by the shims, and finally pressed by the quick clamps to complete the manual loading and positioning of the products. Unloading is the same.

[0005] 2. The vertical movement mechanism has low precision, and the detection probe is easily damaged: The existing vertical movement mechanism has a wire harness connection assembly installed on the top. The wire harness connection assembly drives the probe to align through the cooperation between the upper movable component and the lower fixed component. The vertical movement mechanism is driven by two symmetrically arranged guide rod cylinders. The tolerance range of the vertical movement precision of the guide rod cylinders is ±0.1 mm. When driven simultaneously, due to poor synchronization, left and right tilting is easy to occur, resulting in inaccurate positioning between the upper movable component and the lower fixed component, low probe alignment, poor probe contact, interruption of test signal, affecting test results, and easy damage to the probe, as well as poor guidance.

[0006] 3. Inappropriate pipeline design makes it difficult to simultaneously align the 850° and 350° positions with the test hole: The existing test pipeline is a rigid pipe, integrally formed. Due to defects such as material deformation of the test pipeline, it is difficult for the machinery to ensure that two products enter the test hole at the same time.

[0007] 4. The 850° test station temperature cannot be reached, making it difficult to start the signal: The heating furnace heats part of the test pipeline so that the temperature of the test pipeline at the heating outlet reaches the set temperature. The distance between the right side wall of the existing heating furnace and the 850° test hole is relatively long, making it difficult for the temperature inside the 850° test hole to reach the set temperature.

[0008] 5. Test data is not traceable;

[0009] 6. The air intake pipe is connected with PU tubing, which can easily lead to air leakage;

[0010] 7. The equipment is a split type, which is large in size, occupies a large area, and is not aesthetically pleasing. Utility Model Content

[0011] The technical problem to be solved by this utility model is to provide a dual-temperature zone combustion test bench for oxygen sensors in order to solve the problems existing in the prior art in the background.

[0012] The technical solution adopted by this utility model to solve its technical problem is: a dual-temperature zone combustion test bench for oxygen sensors, including a frame, on which a test component for testing the atmosphere in the test pipeline and a heating furnace are provided, and a portion of the test pipeline is passed through the heating furnace for heating the atmosphere in the test pipeline;

[0013] The testing components include a turntable mounting base, located above the worktable in the frame, used to drive the turntable mounting base to move up and down. The turntable mounting base is equipped with a turntable and a servo motor for driving the turntable mounting base to rotate. Several finger cylinders are mounted on the turntable, each finger cylinder forming a work station. Each finger cylinder holds a product. A pneumatic-electric hybrid slip ring is installed at the center of the turntable mounting base.

[0014] The vertical moving mechanism is installed below the worktable in the frame. A turntable mounting base is installed at the top of the vertical moving mechanism to drive the entire turntable to rise and fall when rotating the workstation, so as to prevent the product from colliding with the test pipeline.

[0015] Furthermore, the vertical movement mechanism includes a base plate on which a servo electric cylinder is mounted. Fixed plates are mounted on both symmetrical sides of the base plate. A mounting seat is mounted on the top of the servo electric cylinder. The mounting seat and the turntable mounting seat are connected by a guide rod assembly. The fixed plate and the mounting seat are connected by a guide rail slider assembly.

[0016] Furthermore, the stations on the turntable are, in order, loading and unloading stations, insulation testing stations, 850° testing stations, cooling stations, 350° testing stations, and internal resistance testing stations; the insulation testing stations, 850° testing stations, 350° testing stations, and internal resistance testing stations are all connected to the integrated pneumatic-electric slip ring, which is connected to the industrial control computer in the frame to form a data acquisition channel.

[0017] Furthermore, the worktable of the frame is equipped with loading and positioning columns for loading and positioning products.

[0018] Furthermore, the end of the test pipe extending out of the heating furnace is the heating outlet end, and an 850° test hole is opened on the test pipe at the heating outlet end. The tail end of the test pipe is the outlet end, and a 350° test hole and an atmosphere concentration detection sensor are installed on the test pipe at the outlet end. Several mounting holes are opened on the test pipe, and the mounting holes are set close to the 850° test hole and the 350° test hole. Temperature detection sensors are installed in the mounting holes.

[0019] Furthermore, the test conduit between the 850° test hole and the 350° test hole is a corrugated pipe.

[0020] Furthermore, the distance L1 between the central axis of the 850° test hole and the heating furnace is less than half the length L2 of the straight section of the test pipe extending out of the heating furnace.

[0021] Furthermore, two fixtures are installed on the workbench of the frame. One fixture is used to support the test pipe at the heating outlet end, and the other fixture is used to support the test pipe at the outlet end.

[0022] Furthermore, the frame is divided into left and right sides. Test components are installed on one side of the frame, and a heating furnace is installed in the middle of the other side of the frame. An industrial control computer is installed on the top of the frame, and several air intake pipes are installed on the bottom of the frame. The air intake pipes are connected to an external air source, and a spray gun is installed between the test pipeline and the air intake pipe.

[0023] Furthermore, a scanner base is installed on the worktable of the rack, and a scanner is installed on the scanner base for scanning product barcodes and triggering tests.

[0024] The beneficial effects of this utility model are:

[0025] 1) The product is automatically clamped by pressing a button, ensuring accurate product positioning and improving loading and unloading efficiency;

[0026] 2) The up-and-down moving mechanism is driven by a servo electric cylinder and guided by a guide rail slider assembly. The physical contact of the probe is changed to a pneumatic-electric hybrid slip ring. The accuracy tolerance range of the up-and-down moving mechanism is ±0.02 mm, which improves the testing accuracy and reliability, has a long service life, and the speed and stroke are adjustable, with good guiding performance.

[0027] 3) A corrugated pipe is installed on the test pipeline between the 850° test hole and the 350° test hole. The corrugated pipe is a flexible tube. The mechanical installation can ensure that the two products can enter the test hole at the same time. The test pipeline is supported by two fixtures, so that the 850° test hole and the 350° test hole are coaxially set with the product, thereby improving the detection accuracy.

[0028] 4) The 850° test hole is located close to the right side wall of the heating furnace and does not interfere with the rotation of the turntable. The temperature inside the 850° test hole can easily reach the set temperature and trigger the signal, further reducing energy consumption.

[0029] 5) After the product is installed in place, use a barcode scanner to scan the barcode or QR code on the test product to start the test and save it to the computer database for unique traceability.

[0030] 6) The air intake pipe is connected with a rigid pipe and equipped with a filter solenoid valve to protect the mass flow meter and improve the safety of the equipment;

[0031] 7) The integrated design facilitates the combination of multiple devices, has a small footprint, and the equipment is aesthetically pleasing, enhancing the influence of the testing equipment. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 This is a schematic diagram of the structure of this utility model after removing the cover and part of the frame;

[0035] Figure 3 This is a schematic diagram of the structure of the test component and heating furnace of this utility model;

[0036] Figure 4 This is a schematic diagram of the structure of the heating furnace and test pipeline of this utility model;

[0037] Figure 5 This is a schematic diagram of the servo motor of this utility model;

[0038] Figure 6 This is a schematic diagram of the structure of the gas-electric integrated hybrid slip ring of this utility model;

[0039] Figure 7 This is a simplified block diagram of the heating furnace temperature control system of this utility model;

[0040] In the diagram: 1. Frame, 2. Test pipeline, 3. Heating furnace, 4. Up and down moving mechanism, 5. Turntable mounting base, 6. Turntable, 7. Servo motor, 8. Finger cylinder, 9. Pneumatic-electric hybrid slip ring, 91. Moving element, 92. Rotor, 93. Inlet wire, 94. Outlet wire, 95. Air outlet, 96. Air inlet, 10. Base plate, 11. Servo electric cylinder, 12. Fixing plate, 13. Mounting base, 14. Guide rail slider assembly, 15. Loading positioning column, 16. Loading and unloading station, 17. Insulation 18. Testing station, 19. Cooling station, 20. 350° testing station, 21. Internal resistance testing station, 22. 850° test hole, 23. 350° test hole, 24. Temperature sensor, 25. Fixture, 26. Atmosphere concentration sensor, 27. Spray gun, 28. Scanning gun, 29. Scanning gun base, 30. Photoelectric switch, 31. Upper limit protection switch, 32. Origin switch, 33. Lower limit protection switch, 34. Emergency stop button. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0042] like Figures 1-7 The oxygen sensor dual-temperature zone combustion test bench shown includes a frame 1, a cover on the frame 1, a test component for testing the atmosphere in the test pipeline 2 and a heating furnace 3 on the frame 1, and a portion of the test pipeline 2 is inserted into the heating furnace 3 for heating the atmosphere in the test pipeline 2.

[0043] The test assembly includes a loading and positioning column 15 mounted on the workbench of the frame 1 for loading and positioning the product;

[0044] The turntable mounting base 5 is located above the workbench in the frame 1 and is used to drive the turntable mounting base 5 to move up and down. The turntable mounting base 5 is equipped with a turntable 6 and a servo motor 7 for driving the turntable mounting base 5 to rotate. The servo motor 7 controls the rotation of the turntable 6, and one rotation is one station, thereby completing one inspection. Several finger cylinders 8 are installed on the turntable 6, and each finger cylinder 8 forms a station. Each finger cylinder 8 holds a product. A pneumatic-electric hybrid slip ring 9 is installed at the center of the turntable mounting base 5.

[0045] like Figure 5 As shown, the upper limit protection switch 31 and the origin switch 32 are installed on the upper end of the servo motor 7, and the lower limit protection switch 33 is installed on the lower end of the servo motor 7. The turntable 6 can only rotate when the servo motor 7 has a signal output from the origin switch 32.

[0046] The vertical moving mechanism 4 is installed below the worktable in the frame 1. The top of the vertical moving mechanism 4 is equipped with a turntable mounting base 5, which is used to drive the entire turntable 6 to rise and fall when rotating the workstation to prevent the product from colliding with the test pipeline 2.

[0047] like Figure 2 As shown, the up-and-down moving mechanism 4 includes a base plate 10, on which a servo electric cylinder 11 is mounted. Fixing plates 12 are mounted on both symmetrical sides of the base plate 10. A mounting seat 13 is mounted on the top of the servo electric cylinder 11. The mounting seat 13 is connected to the turntable mounting seat 5 through a guide rod assembly. The fixing plate 12 is connected to the mounting seat 13 through a guide rail slider assembly 14.

[0048] The stations on the turntable 6 are, in order, loading and unloading station 16, insulation test station 17, 850° test station 18, cooling station 19, 350° test station 20, and internal resistance test station 21; insulation test station 17, 850° test station 18, 350° test station 20, and internal resistance test station 21 are all connected to the gas-electric integrated hybrid slip ring 9 (commercially available), and the gas-electric integrated hybrid slip ring 9 is connected to the industrial control computer in the frame 1 to form a data acquisition channel.

[0049] A photoelectric switch 30 is installed on the edge of the turntable mounting base 5 to detect the position signal. The photoelectric switch 30 is located at the internal resistance test station 21.

[0050] Among them, such as Figure 6 As shown, the pneumatic-electric hybrid slip ring 9 includes a mover 91 and a rotor 92. The mover 91 is connected to the inlet line 93, and the rotor 92 is connected to the outlet line 94. The outer circumference of the rotor 92 is provided with a plurality of air outlets 95, which are connected to the cylinder. The outer wall of the mover 91 is provided with a plurality of air inlets 96 in the vertical direction, which are connected to the solenoid valve.

[0051] like Figure 2 and Figure 4 As shown, the end of the test pipe 2 that extends out of the heating furnace 3 is the heating outlet end, and an 850° test hole 22 is opened on the test pipe 2 at the heating outlet end. The tail end of the test pipe 2 is the outlet end, and a 350° test hole 23 and an atmosphere concentration detection sensor 26 are installed on the test pipe 2 at the outlet end.

[0052] Both the 850° test hole 22 and the 350° test hole 23 are countersunk holes, which seal the test line 2 to prevent the gas inside the test line 2 from flowing out of the countersunk holes.

[0053] Several mounting holes are provided on the test pipeline 2. The mounting holes are located near the 850° test hole and the 350° test hole. Temperature detection sensors 24 are installed in the mounting holes.

[0054] When the temperature sensor 24 detects that the temperature inside the 850° test hole 22 is higher than the set temperature, the temperature of the heating furnace 3 is lowered.

[0055] When the temperature sensor 24 detects that the temperature inside the 850° test hole 22 is lower than the set temperature, the temperature of the heating furnace 3 is increased so that the temperature inside the 850° test hole 22 is kept within the tolerance range of the set temperature.

[0056] The atmosphere flows into the 350° test hole 23. After heat loss, the 350° test hole is kept within the set temperature tolerance range by heating or other means.

[0057] The test conduit 2 between the 850° test hole 22 and the 350° test hole 23 is a corrugated pipe, and the mechanical installation can ensure that the two products can enter the test hole at the same time.

[0058] The corrugated pipe is made of 310S stainless steel.

[0059] Continuous operating temperature: 1000℃~1100℃ (dry oxidation environment);

[0060] Instantaneous temperature resistance: up to 1150℃ (short-term exposure, such as emergency conditions);

[0061] Visual inspection: Check for surface oxide peeling, localized deformation, or cracks monthly;

[0062] Non-destructive testing: Conduct penetrant testing or ultrasonic thickness measurement annually to assess the wall thickness reduction rate;

[0063] Mild operating conditions (below 800℃, no corrosive media): 3-5 years or longer;

[0064] Harsh operating conditions (above 1000℃, including corrosive media): 6 months - 2 years;

[0065] If the wall thickness is reduced by more than 20% of the design value, visible cracks, severe deformation, or leakage may occur.

[0066] like Figure 4 As shown, the distance L1 between the central axis of the 850° test hole 22 and the heating furnace 3 is less than half the length L2 of the straight section of the test pipe 2 extending out of the heating furnace 3. In other words, the 850° test hole is set close to the right side wall of the heating furnace and does not interfere with the rotation of the turntable. The temperature inside the 850° test hole can easily reach the set temperature and the signal is activated. In order to solve the problem that the test hole temperature is difficult to reach a high temperature due to the long distance between the test hole and the heating furnace 3.

[0067] Two fixtures 25 are mounted on the workbench of the frame 1. One fixture 25 is used to support the test pipe 2 at the heating outlet end, and the other fixture 25 is used to support the test pipe 2 at the outlet end.

[0068] like Figure 1 As shown, the frame 1 is divided into left and right sides, with an integrated design that occupies a small area and has an aesthetically pleasing appearance. Test components are installed on one side of the frame 1, and a heating furnace 3 is installed in the middle of the other side of the frame 1. Temperature detection sensors 24 are also installed on the furnace body of the heating furnace 3. The furnace liner of the heating furnace 3 is made of nanofiber insulation material. The heating furnace 3 is a heating wire heating furnace. An industrial control computer is installed on the top of the frame 1. The industrial control computer is equipped with a temperature controller with built-in PID control.

[0069] like Figure 7 As shown, the heating furnace temperature control system adopts a classic closed-loop negative feedback control system. The temperature controller uses an intelligent programmable temperature regulator, and the power control board uses a zero-crossing triggered solid-state relay; the noiseless soft-contact triggering greatly improves the lifespan of the heating element. The temperature sensing element uses a K-type thermocouple. Because the single-loop temperature controller can self-tune PID parameters, no operator intervention is required. It can automatically adjust the output signal according to the heating and cooling requirements of different temperature curves. At the same time, the system is equipped with over-temperature, under-temperature, and thermocouple breakage alarm protection functions, which greatly reduces the requirements for operator experience. Key electrical components are high-performance and maintenance-free, improving the reliability of the equipment.

[0070] Several air intake pipes are installed below the frame 1. The air intake pipes are equipped with devices such as mass flow meters and filter solenoid valves for controlling the atmosphere concentration. The air intake pipes are connected to an external air source. A spray gun 27 is installed between the test pipeline 2 and the air intake pipes.

[0071] In addition, such as Figure 1 As shown, a scanner base 29 is installed on the workbench of the rack 1. A scanner is installed on the scanner base 29 to scan the product barcode and trigger the test. Only products that have been scanned by the scanner can start the test bench. At the same time, the data is saved to the computer database for unique traceability. The test data can be searched by date, model, batch number, tester, QR code or barcode content, etc.

[0072] like Figure 1 As shown, an emergency stop button 34 is installed on the frame 1. In case of equipment malfunction or operator misoperation, the emergency stop button can quickly cut off the power supply to the equipment or stop the operation of the equipment to avoid mechanical injury to the operator.

[0073] Work process:

[0074] Step 1: Before testing, since the product is fixed in position on each finger cylinder 8, in order to ensure that the product is aligned with the 850° test hole 22 and the 350° test hole 23, the two fixtures 25 and the corrugated test pipe 2 are adjusted in advance so that the product installed on the 850° test station 18 is coaxial with the 850° test hole 22, and the product on the 350° test station 20 is coaxial with the 350° test hole 23.

[0075] Step 2: The product is placed on the loading and positioning column 15 manually or automatically.

[0076] Step 3: In normal state, the finger cylinder 8 on the loading / unloading station 16 is in the open state. When the finger cylinder 8 is activated, press the button to control the finger cylinder 8 to clamp the product on the loading positioning column 15. After the product is installed in place, use a barcode scanner to scan the barcode or QR code on the product before the test can be started.

[0077] Step 4: The up-and-down moving mechanism 4 drives the turntable mounting base 5 to rise; the servo motor 7 drives the turntable mounting base 5 to rotate, rotating the product on the loading / unloading station 16 to the insulation test station 17. The up-and-down moving mechanism 4 drives the turntable mounting base 5 to fall for insulation testing, and the test results are transmitted to the industrial control computer. Similarly, for each station rotation, the up-and-down moving mechanism 4 drives the turntable mounting base 5 to rise and fall, and the servo motor 7 drives the turntable mounting base 5 to rotate once, and the product is tested at the corresponding station.

[0078] Step 5: Before starting the machine, the spray gun 27 is ignited. The test atmosphere gas source passes through the air intake pipe and then flows into the inlet end of the test pipeline 2 through the spray gun 27 to burn the test atmosphere. The burned test atmosphere enters the test pipeline 2.

[0079] Step 6: The temperature detection sensor 24 on the furnace body of the heating furnace 3 detects the temperature. If the set temperature has not been reached, the heating furnace 3 starts to heat the test atmosphere, so that the temperature at the heating outlet of the test pipe 2 is 850° and the temperature at the outlet of the test pipe 2 is 350°. If the set temperature is reached, the heating furnace 3 does not need to be started.

[0080] Step 7: When the product is rotated to the 850° test station, the temperature detection sensor 24 at the heating outlet end of the test pipeline 2 detects the set temperature (that is, within the 850° tolerance range), the detection signal is activated, and the atmosphere detection at the 850° temperature is performed.

[0081] Step 8: After the test is completed, rotate the product to the cooling station 19 for cooling;

[0082] Step 9: After cooling is complete, rotate the product to the 350° test station 20. The temperature detection sensor 24 at the outlet of the test pipeline 2 detects the set temperature (that is, within the 350° tolerance range), and the detection signal is activated to perform atmosphere detection at 350°. If the set temperature is not reached, the temperature at that point is heated until the set temperature is reached.

[0083] Step 10: After the test is completed, rotate the product to the internal resistance test station 21 to perform the internal resistance test. After the test is completed, the photoelectric switch detects the position signal and removes the product. If the product is qualified, it is sent to the qualified hopper; if the product is unqualified, it is sent to the NG hopper.

[0084] As can be seen from the above steps, the six workstations work simultaneously. When the turntable workstations switch, the turntable 6 is first raised by the up-and-down moving mechanism 4, then the turntable 6 rotates, and the workstation switches to the predetermined position. Then the up-and-down moving mechanism 4 lowers the turntable 6, so that the workpiece detection data on the workstation is transmitted to the industrial control computer through the pneumatic-electric hybrid slip ring 9.

[0085] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dual-temperature zone combustion test bench for an oxygen sensor, characterized in that: Includes a frame (1), on which a test assembly for testing the atmosphere in the test pipeline (2) and a heating furnace (3) are provided. A portion of the test pipeline (2) is inserted into the heating furnace (3) to heat the atmosphere in the test pipeline (2). Test components include The turntable mounting base (5) is located above the workbench in the frame (1) and is used to drive the turntable mounting base (5) to move up and down. The turntable mounting base (5) is equipped with a turntable (6) and a servo motor (7) for driving the turntable mounting base (5) to rotate. Several finger cylinders (8) are installed on the turntable (6). Each finger cylinder (8) forms a work station. Each finger cylinder (8) holds a product. A pneumatic-electric hybrid slip ring (9) is installed at the center of the turntable mounting base (5). The up-and-down moving mechanism (4) is installed below the worktable in the frame (1). The top of the up-and-down moving mechanism (4) is equipped with a turntable mounting base (5) to drive the entire turntable (6) to rise and fall when rotating the workstation, so as to prevent the product from colliding with the test pipeline (2).

2. The dual-temperature zone combustion test bench for an oxygen sensor according to claim 1, characterized in that: The up-and-down moving mechanism (4) includes a base plate (10), on which a servo electric cylinder (11) is mounted. Fixing plates (12) are mounted on both symmetrical sides of the base plate (10). A mounting seat (13) is mounted on the top of the servo electric cylinder (11). The mounting seat (13) is connected to the turntable mounting seat (5) through a guide rod assembly. The fixing plate (12) is connected to the mounting seat (13) through a guide rail slider assembly (14).

3. The dual-temperature zone combustion test bench for an oxygen sensor according to claim 1, characterized in that: The stations on the turntable (6) are, in order, loading and unloading station (16), insulation test station (17), 850° test station (18), cooling station (19), 350° test station (20), and internal resistance test station (21). The insulation test station (17), 850° test station (18), 350° test station (20), and internal resistance test station (21) are all connected to the gas-electric integrated hybrid slip ring (9). The gas-electric integrated hybrid slip ring (9) is connected to the industrial control computer in the frame (1) to form a data acquisition channel.

4. The dual-temperature zone combustion test bench for an oxygen sensor according to claim 1, characterized in that: The workbench of the frame (1) is equipped with a loading and positioning column (15) for loading and positioning products.

5. The dual-temperature zone combustion test bench for an oxygen sensor according to claim 1, characterized in that: The end of the test pipe (2) extending out of the heating furnace (3) is the heating outlet end. An 850° test hole (22) is opened on the test pipe (2) at the heating outlet end. The tail of the test pipe (2) is the outlet end. A 350° test hole (23) and an atmosphere concentration detection sensor (26) are opened on the test pipe (2) at the outlet end. Several mounting holes are opened on the test pipe (2). The mounting holes are set close to the 850° test hole and the 350° test hole. A temperature detection sensor (24) is installed in the mounting hole.

6. The dual-temperature zone combustion test bench for an oxygen sensor according to claim 5, characterized in that: The test pipe (2) between the 850° test hole (22) and the 350° test hole (23) is a corrugated pipe.

7. A dual-temperature zone combustion test bench for an oxygen sensor according to claim 5, characterized in that: The distance L1 between the central axis of the 850° test hole (22) and the heating furnace (3) is less than half the length L2 of the straight section of the test pipe (2) extending out of the heating furnace (3).

8. The dual-temperature zone combustion test bench for an oxygen sensor according to claim 5, characterized in that: Two fixtures (25) are installed on the workbench of the frame (1). One fixture (25) is used to support the test pipe (2) at the heating outlet end, and the other fixture (25) is used to support the test pipe (2) at the outlet end.

9. A dual-temperature zone combustion test bench for an oxygen sensor according to claim 1, characterized in that: The frame (1) is divided into left and right sides. A test component is installed on one side of the frame (1), and a heating furnace (3) is installed in the middle of the other side of the frame (1). An industrial control computer is installed on the top of the frame (1), and several air inlet pipes are installed below the frame (1). The air inlet pipes are connected to an external air source, and a spray gun (27) is installed between the test pipeline (2) and the air inlet pipe.

10. A dual-temperature zone combustion test bench for an oxygen sensor according to claim 1, characterized in that: The workbench of the frame (1) is equipped with a scanner base (29), and a scanner is mounted on the scanner base (29) for scanning product barcodes and triggering tests.

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