A cold-heat shock resistance performance detection device for a three-way catalyst

Abstract

The present application relates to the technical field of three-way catalytic detection, and discloses a cold and hot impact resistance performance detection equipment for a three-way catalytic converter, which comprises a workbench and a CCD camera, and an engine exhaust simulation system and a waste gas recovery system connected with the three-way catalytic converter are respectively installed on the workbench, and a cold air cooling system for rapidly cooling the three-way catalytic converter is further provided.The waste gas recovery structure is composed of a mounting cover, a force storage piston, an air extraction piston and the like, and after detection is completed, the residual waste gas in the three-way catalytic converter can be fully purged and recovered under the driving of the driving motor, so that environmental pollution caused by direct waste gas emission is effectively avoided, and the environmental protection requirement is strictly met.Meanwhile, the equipment structure design is highly collaborative, the guide block and the top block on the rotating disc cooperate with each other, the force storage piston, the air extraction piston and the push rod are orderly linked, the inflation, exhaust, waste gas recovery and jacking and taking operation are sequentially performed, so that the equipment energy consumption is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of three-way catalytic converter testing technology, specifically, it relates to a device for testing the thermal shock resistance of a three-way catalytic converter. Background Technology

[0002] In automotive emission control systems, the three-way catalytic converter is a key component for reducing harmful substances in exhaust gases. Its operating environment is constantly subjected to extreme conditions of alternating high and low temperatures, and its resistance to thermal shock directly affects its service life and purification efficiency. Therefore, testing the thermal shock resistance of three-way catalytic converters is an important step in the production and research and development process.

[0003] Currently, most existing testing equipment assesses the structural stability and performance degradation of three-way catalytic converters by simulating a cycle of high-temperature exhaust and low-temperature cooling. However, during testing, especially after multiple thermal shock cycles, a large amount of untreated exhaust gas often remains inside the three-way catalytic converter. This residual exhaust gas not only contains harmful components such as carbon monoxide, hydrocarbons, and nitrogen oxides, but may also contain powder particles detached from the catalyst. If this residual harmful exhaust gas leaks directly into the testing environment, it will pollute the surrounding air, damage the air quality of the working environment, and cause respiratory diseases and other health problems for operators with long-term exposure.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] A device for testing the thermal shock resistance of a three-way catalytic converter includes a workbench, on which an engine exhaust simulation system and an exhaust gas recovery system connected to the three-way catalytic converter are respectively installed, as well as a cold air cooling system for rapidly cooling the three-way catalytic converter. A CCD camera for detecting the state of the workpiece is also installed on the workbench.

[0007] The bottom of the workbench is equipped with an installation cover. The two ends of the installation cover are respectively connected to the engine exhaust simulation system and the exhaust gas recovery system. Inside the installation cover, a accumulator piston and an exhaust piston are slidably arranged. A synchronizing rod is installed between the accumulator piston and the exhaust piston. The accumulator piston and the exhaust piston slide to charge and exhaust the three-way catalytic converter and recover residual exhaust gas into the installation cover.

[0008] The mounting cover has a turntable rotatably mounted inside, and a guide block is mounted on the side wall of the turntable. The guide block rotates and compresses the sliding of the accumulating piston. A top block is mounted on the turntable. The top block is used to lift the push rod inserted into the mounting cover and move it upward. A suction block is mounted on the push rod and is used to lift the three-way catalytic converter upward. A piston plate connected to the mounting cover is installed inside the suction block to increase the suction force during the upward movement of the suction block and to reduce the suction force when the room temperature is restored.

[0009] In a preferred embodiment of the present invention, four support legs are installed at the bottom corner of the workbench, and each support leg is equipped with an anti-slip pad at its bottom. The anti-slip pad is in the shape of a protrusion. A guardrail is installed on the workbench, and a bracket is installed on the guardrail. A crossbeam is installed on the top of the workbench.

[0010] In a preferred embodiment of the present invention, a pair of positioning blocks are installed on the workbench, and a support plate is screwed onto the surface of the pair of positioning blocks. A handle is installed on the support plate, a first mounting bracket is installed at one end of the support plate, a synchronization bracket is installed on the first mounting bracket, and a vertical pole is installed at the other end of the support plate. A second mounting bracket is installed on the top of the vertical pole. The second mounting bracket and the first mounting bracket are in contact with each other on the end face of the three-way catalytic converter. A vertical plate is installed on the support plate, and clamping assemblies are installed on both the vertical plate and the synchronization bracket. The clamping assemblies are used to clamp the end of the three-way catalytic converter.

[0011] In a preferred embodiment of the present invention, the clamping assembly includes a positioning frame for positioning, and the positioning frame is connected to a synchronization frame. The positioning frame is U-shaped, and a pair of parallel auxiliary arms and a swing arm are rotatably mounted on the inner side wall of the positioning frame. Clamping plates are installed at the ends of the auxiliary arms and the swing arms, and the clamping plates are arc-shaped. A strip-shaped groove is formed on the swing arm, and a slide rod is slidably disposed on the strip-shaped groove. A U-shaped frame is mounted on the slide rod, and a synchronization plate is installed at the end of the U-shaped frame. An electric push rod is installed at one end of the positioning frame, and the output rod of the electric push rod movably passes through the positioning frame. Furthermore, the output end of the electric push rod is connected to the synchronization plate, and a laser displacement detection sensor is also installed on the worktable. The laser displacement detection sensor is aligned with the workpiece held by the clamping assembly. The laser displacement detection sensor is used to detect the axial displacement of the workpiece during the process. The laser displacement detection sensor emits a laser beam to irradiate the key axial detection points of the three-way catalytic converter and collects the axial displacement data of the workpiece in real time during the thermal shock process. If the displacement exceeds the preset threshold, an alarm will be automatically triggered and the working condition stage in which the abnormal displacement occurs will be recorded, providing data support for subsequent analysis of the structural stability of the three-way catalytic converter.

[0012] In a preferred embodiment of the present invention, the electric push rod housing is equipped with a fixed base, the synchronous frame is equipped with a boss, the fixed base is fitted against the side wall of the boss, a stud is installed on the boss, and the smooth surface of the stud without threads is rotatably connected to the fixed base. A knob is screwed onto the threaded position on the stud surface, and a crank is installed on the knob. Rotating the knob and making the knob fit against the fixed base positions the angle of the electric push rod.

[0013] In a preferred embodiment of the present invention, a gas accumulator is installed at one end of the mounting cover, and a first connecting pipe is installed on the gas accumulator. The end of the first connecting pipe is connected to the engine exhaust simulation system. A vacuum hood is installed at the other end of the mounting cover, and a second connecting pipe is installed on the vacuum hood. The end of the second connecting pipe is connected to the exhaust gas recovery system. A one-way valve is installed on the first connecting pipe. A top plate is slidably installed at the end of the first connecting pipe. A push rod is installed at the end of the top plate, and the end of the push rod is connected to the accumulator piston. After the top plate and the vacuum piston are separated from the first connecting pipe and the second connecting pipe respectively, the charging and exhaust processes are ensured to proceed smoothly. A partition is installed inside the mounting cover. The partition passes through a synchronizing rod. A return spring is sleeved on the synchronizing rod. One end of the return spring is engaged with the accumulator piston, and the other end of the return spring is engaged with the partition.

[0014] In a preferred embodiment of the present invention, an inspection door is bolted to the mounting cover, a handle is mounted on the inspection door, a drive motor is installed inside the mounting cover, a transmission shaft is mounted on the output end of the drive motor, the end of the transmission shaft is connected to the turntable, and inclined surfaces are provided at both ends of the guide block, and an arc surface is connected between the inclined surfaces, the central angle of the arc surface corresponds to the central angle of the top block.

[0015] In a preferred embodiment of the present invention, a push plate is installed on the top of the push rod, the push plate is placed at the bottom of the suction block, a ball is installed at the bottom of the push rod, the ball is in contact with the top block, a pressure plate is installed on the push rod, and a storage spring is sleeved on the push rod. One end of the storage spring is engaged inside the mounting cover, and the other end of the storage spring is engaged on the pressure plate.

[0016] In a preferred embodiment of the present invention, the suction block has a cylindrical inner cavity, and the piston plate is slidably disposed in the suction block. A piston rod is installed at the bottom of the piston plate, the end of the piston rod movably passes through the push rod, and a fixing frame is installed on the side wall of the piston rod. The fixing frame is L-shaped and movably passes through a through groove opened in the side wall of the push rod. The top of the fixing frame is installed at the bottom of the mounting cover.

[0017] A method for testing the thermal shock resistance of a three-way catalytic converter, comprising the following steps:

[0018] Step 1: Equipment Installation and Debugging. Fix the workbench and check the connection between the engine exhaust simulation system, exhaust gas recovery system, etc., and the operation of components such as the accumulator piston, suction piston, and turntable inside the mounting cover to ensure that the equipment is normal. At the same time, debug the CCD camera 112 with intelligent detection function (calibrate its shooting angle, clarity, and abnormal feature recognition algorithm to ensure that it can accurately capture the external state of the three-way catalytic converter) and the laser displacement detection sensor with intelligent detection function (calibrate its laser emission position, axial displacement detection accuracy, and threshold alarm parameters to ensure that it can accurately collect workpiece axial displacement data). Ensure that the equipment and intelligent detection components are operating normally.

[0019] Step 2: Clamping and fixing the three-way catalytic converter. The three-way catalytic converter is initially positioned by the first and second mounting brackets on the support plate. Then, the electric push rod of the clamping assembly drives the arc-shaped clamping plate to clamp it. If necessary, the angle of the electric push rod can be adjusted by the crank handle. After clamping, the laser displacement detection sensor is activated to record the initial axial position data of the three-way catalytic converter as a reference for subsequent testing.

[0020] Step 3: High-temperature operating condition simulation. The engine exhaust simulation system generates high-temperature exhaust gas, which is then introduced into the three-way catalytic converter, raising its temperature to 400-1000℃ and maintaining it, simulating high-load driving. During this process, the laser displacement detection sensor monitors the axial displacement of the three-way catalytic converter in real time. If the displacement exceeds the preset threshold, an alarm is automatically triggered and the current high-temperature parameters are recorded. At the same time, the CCD camera can intermittently capture images of the external condition of the three-way catalytic converter to initially monitor for abnormalities such as coating bulging under high temperatures.

[0021] Step 4: Low-temperature impact simulation. The engine exhaust simulation system and exhaust gas recovery system are turned off, and the cold air cooling system is turned on to cause the temperature of the three-way catalytic converter to drop sharply, simulating a rapid cooling environment. During this stage, the laser displacement detection sensor continuously collects axial displacement data to capture the displacement changes of the three-way catalytic converter caused by thermal expansion and contraction during the rapid temperature drop. The CCD camera simultaneously captures images to monitor whether initial damage such as external cracks and coating peeling occurs under low-temperature impact.

[0022] Step 5: Repeat the thermal shock test, repeating steps 3 and 4 multiple times to subject the three-way catalytic converter to multiple alternating thermal shocks; during each alternation, the laser displacement detection sensor automatically stores the axial displacement data of each operating stage to form a displacement change curve; the CCD camera takes pictures at a preset frequency and compares and analyzes the differences in external state under different cycles, automatically marking suspected damage areas and the time of occurrence.

[0023] Step Six: Exhaust Gas Treatment and Removal. After testing, start the drive motor and purge and recover the exhaust gas through components such as guide blocks and accumulator pistons. Unlock the clamping assembly, and the suction block adsorbs the three-way catalytic converter and separates it from the workstation. After the temperature returns to room temperature, remove the three-way catalytic converter. Finally, observe the internal state through an endoscope, test the CO / HC / NOx conversion rate attenuation rate using a catalytic performance test bench, and test the carrier bending strength change using mechanical testing equipment. Combine the axial displacement data recorded by the laser displacement detection sensor (to assess structural stability) with the intelligent detection results of the CCD camera (to assist in judging external damage), and comprehensively evaluate the thermal shock resistance performance of the three-way catalytic converter.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] This invention features a waste gas recovery structure comprised of an installation cover, a accumulator piston, and a suction piston. After testing, driven by a motor, it can thoroughly purge and recover residual waste gas inside the three-way catalytic converter, effectively preventing environmental pollution caused by direct emissions and strictly complying with environmental protection requirements. Simultaneously, the equipment's structural design is highly synergistic. The guide block and top block on the turntable work together to drive the accumulator piston, suction piston, and push rod in an orderly manner, enabling a series of operations such as charging, venting, waste gas recovery, and lifting for component retrieval to proceed seamlessly. During the lifting process, the suction block creates negative pressure through internal air pressure changes to stably adsorb the three-way catalytic converter. When the temperature returns to room temperature, the suction automatically decreases to unlock the converter, ensuring stability during the transfer process and facilitating subsequent component retrieval. This interconnected design significantly reduces redundant drive components, lowering energy consumption and improving operational efficiency and economy.

[0026] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0027] In the attached diagram:

[0028] Figure 1 An overall test device for the thermal shock resistance performance of a three-way catalytic converter Figure 1 ;

[0029] Figure 2 An overall test device for the thermal shock resistance performance of a three-way catalytic converter Figure 2 ;

[0030] Figure 3 A partial test device for the thermal shock resistance performance of a three-way catalytic converter Figure 1 ;

[0031] Figure 4 A schematic diagram of the clamping component structure of a device for testing the thermal shock resistance performance of a three-way catalytic converter;

[0032] Figure 5A device for testing the thermal shock resistance of a three-way catalytic converter. Figure 4 Enlarged view of point A in the middle;

[0033] Figure 6 A partial test device for the thermal shock resistance performance of a three-way catalytic converter Figure 2 ;

[0034] Figure 7 An internal view of the mounting cover of a device for testing the thermal shock resistance of a three-way catalytic converter;

[0035] Figure 8 A device for testing the thermal shock resistance of a three-way catalytic converter. Figure 7 Enlarged view at point B in the middle;

[0036] Figure 9 A cross-sectional view of the push rod of a device for testing the thermal shock resistance of a three-way catalytic converter;

[0037] Figure 10 A three-dimensional diagram of a rotating disk for testing the thermal shock resistance of a three-way catalytic converter.

[0038] In the picture:

[0039] Workbench; 11. Support leg; 111. Anti-slip mat; 112. CCD camera; 113. Laser displacement detection sensor; 12. Enclosure; 121. Bracket; 122. Crossbeam; 13. Engine exhaust simulation system; 14. Exhaust gas recovery system; 15. Cold air cooling system; 16. Support plate; 161. Positioning block; 162. Handle; 163. Vertical plate; 17. First mounting bracket; 171. Synchronizing bracket; 18. Second mounting bracket; 181. Vertical pole; 19. Positioning bracket; 191. Electric push rod; 192. Clamping plate; 193. Auxiliary arm; 194. Swing arm; 195. Strip groove; 196. Slide rod; 197. U-shaped frame; 198. Synchronizing plate; 1990. Boss; 1991. Fixed seat; 1992. Stud; 1993. Knob; 1994. Crank handle;

[0040] 2. Mounting cover; 21. Gas accumulator cover; 211. First connecting pipe; 212. One-way valve; 213. Inspection door; 214. Pull handle; 22. Extraction cover; 221. Second connecting pipe; 222. Extraction piston; 23. Accumulation piston; 231. Push rod; 232. Top plate; 233. Synchronizing rod; 234. Return spring; 235. Partition plate;

[0041] 3. Turntable; 31. Drive motor; 311. Transmission shaft; 32. Guide block; 321. Inclined surface; 322. Arc surface; 33. Top block; 331. Rolling ball; 34. Push rod; 341. Push plate; 342. Suction block; 343. Pressure plate; 344. Storage spring; 35. Piston plate; 351. Piston rod; 352. Fixing frame; 353. Through groove. Detailed Implementation

[0042] To make the objectives, 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 with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0043] Example 1, as Figures 1 to 10 As shown, a device for testing the thermal shock resistance of a three-way catalytic converter includes a workbench 1. An engine exhaust simulation system 13 and an exhaust gas recovery system 14, which are connected to the three-way catalytic converter, are respectively installed on the workbench 1. A cold air cooling system 15 for rapidly cooling the three-way catalytic converter is also installed on the workbench 1. A CCD camera 112 for detecting the state of the workpiece is also installed on the workbench 1. The CCD camera 112 is used to observe the external state of the workpiece and can automatically identify abnormal features such as color changes of the external coating of the three-way catalytic converter and minor surface damage, and generate a preliminary test report.

[0044] The bottom of the workbench 1 is equipped with a mounting cover 2. The two ends of the mounting cover 2 are connected to the engine exhaust simulation system 13 and the exhaust gas recovery system 14 respectively. Inside the mounting cover 2, a accumulator piston 23 and an exhaust piston 222 are slidably arranged. A synchronizing rod 233 is installed between the accumulator piston 23 and the exhaust piston 222. The accumulator piston 23 and the exhaust piston 222 slide to charge and exhaust the three-way catalytic converter and recover the residual exhaust gas into the mounting cover 2.

[0045] A turntable 3 is rotatably mounted inside the mounting cover 2, and a guide block 32 is mounted on the side wall of the turntable 3. The guide block 32 rotates and compresses the sliding force-accumulating piston 23. A top block 33 is mounted on the turntable 3, which is used to lift the push rod 34 inserted into the mounting cover 2 and move it upward. A suction block 342 is mounted on the push rod 34, and the suction block 342 is used to lift the three-way catalytic converter upward. A piston plate 35 connected to the mounting cover 2 is installed inside the suction block 342 to increase the suction force during the upward movement of the suction block 342 and to restore the piston plate 35. When the temperature returns to room temperature, the suction force is reduced. The guide block 32 rotates and squeezes the accumulator piston 23, causing the accumulator piston 23 and the suction piston 222 to slide synchronously through the synchronizing rod 233, thereby achieving the charging, exhaust, and recovery of residual exhaust gas to the three-way catalytic converter. The top block 33 lifts the push rod 34, which drives the suction block 342 to move upward. The piston plate 35 inside the suction block 342 slides relative to change the air pressure, thereby achieving the charging, exhaust, and recovery of residual exhaust gas to the three-way catalytic converter, as well as the lifting and removal of parts, ensuring the high efficiency of exhaust gas treatment and the convenience of parts removal.

[0046] like Figure 1 and Figure 2 As shown in the specific embodiment, four support legs 11 are installed at the bottom corner of the workbench 1. Each support leg 11 has an anti-slip pad 111 at its bottom, and the anti-slip pad 111 is in the shape of a protrusion. A guardrail 12 is installed on the workbench 1, and a bracket 121 is installed on the guardrail 12. A crossbeam 122 is installed on the top of the workbench 1. The support legs 11 and the anti-slip pad 111 enhance the stability of the workbench 1. The guardrail 12, the bracket 121, and the crossbeam 122 provide a mounting base for other components of the equipment, ensuring the stability of the overall structure of the equipment.

[0047] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, further, a pair of positioning blocks 161 are installed on the workbench 1. A support plate 16 is installed on the surface of the pair of positioning blocks 161 by bolts. A handle 162 is installed on the support plate 16. A first mounting bracket 17 is installed on one end of the support plate 16. A synchronization bracket 171 is installed on the first mounting bracket 17. A vertical rod 181 is installed on the other end of the support plate 16. A second mounting bracket 18 is installed on the top of the vertical rod 181. The second mounting bracket 18 and the first mounting bracket 17 are in contact with the end face of the three-way catalytic converter. A vertical plate 163 is installed on the support plate 16. A clamping assembly is installed on both the vertical plate 163 and the synchronization bracket 171. The clamping assembly is used to clamp the end of the three-way catalytic converter. The support plate 16 is fixed by the positioning block 161. The operator moves the support plate 16 by the handle 162, so that the first mounting bracket 17 and the second mounting bracket 18 come into contact with the end face of the three-way catalytic converter to achieve initial positioning. The upright plate 163 is further fixed to the clamping components on the synchronous frame 171, realizing the rapid positioning and stable clamping of the three-way catalytic converter, and improving the clamping efficiency and stability.

[0048] like Figure 4 and Figure 5As shown, the clamping assembly further includes a positioning frame 19 for positioning, and the positioning frame 19 is connected to the synchronization frame 171. The positioning frame 19 is U-shaped, and a pair of parallel auxiliary arms 193 and swing arms 194 are rotatably mounted on the inner side wall of the positioning frame 19. The ends of the auxiliary arms 193 and swing arms 194 are equipped with clamping plates 192, and the clamping plates 192 are arc-shaped. A strip groove 195 is opened on the swing arm 194, and a slide rod 196 is slidably arranged on the strip groove 195. A U-shaped frame 197 is installed on the slide rod 196, and a synchronization plate 198 is installed at the end of the U-shaped frame 197. An electric push rod 191 is installed at one end of the positioning frame 19. The output rod of the electric push rod 191 passes through the positioning frame 19, and the output end of the electric push rod 191 is connected to the synchronization plate 198. A laser displacement detection sensor 113 is also installed on the workbench 1, and the laser displacement detection sensor 113 is aligned with the workpiece held by the clamping assembly. The laser displacement detection sensor 113 is used to detect the axial displacement of the workpiece during the process. The laser displacement detection sensor 113 emits a laser beam to irradiate the key axial detection points of the three-way catalytic converter, and collects the axial displacement data of the workpiece in real time during thermal shock. If the displacement exceeds the preset threshold, an alarm will be automatically triggered and the stage of the abnormal displacement will be recorded, providing data support for subsequent analysis of the structural stability of the three-way catalytic converter. The electric push rod 191 of the clamping assembly pushes the synchronous plate 198, so that the U-shaped frame 197 drives the slide rod 196 to slide in the strip groove 195 of the swing arm 194, causing the swing arm 194 and the auxiliary arm 193 to rotate around the positioning frame 19, so that the end arc-shaped clamping plate 192 clamps the end of the three-way catalytic converter, realizing a stable clamping of the end of the three-way catalytic converter. The arc-shaped clamping plate 192 has a high fit, and the electric push rod 191 can control the clamping force.

[0049] like Figure 4 and Figure 5 As shown, further, the housing of the electric actuator 191 is equipped with a fixed base 1991, and a boss 1990 is installed on the synchronous frame 171. The fixed base 1991 is attached to the side wall of the boss 1990. A stud 1992 is installed on the boss 1990, and the smooth surface of the stud 1992 without threads is rotatably connected to the fixed base 1991. A knob 1993 is screwed onto the threaded position on the surface of the stud 1992. A crank 1994 is installed on the knob 1993. Rotating the knob 1993 and making the knob fit against the fixed base 1991 positions the angle of the electric actuator 191. By rotating the crank handle 1994, the knob 1993 moves on the stud 1992. The smooth surface of the stud 1992 rotates and engages with the fixed base 1991, so that the knob 1993 fits against the fixed base 1991 to position the electric push rod 191 at an angle. This allows for flexible adjustment of the angle of the electric push rod 191, which can adapt to the clamping requirements of three-way catalytic converters of different specifications and improves the versatility of the equipment.

[0050] Example 2 differs from the above examples in that: Figure 6 and Figure 7 As shown, a gas accumulator 21 is installed at one end of the mounting cover 2, and a first connecting pipe 211 is installed on the gas accumulator 21. The end of the first connecting pipe 211 is connected to the engine exhaust simulation system 13. A gas extraction hood 22 is installed at the other end of the mounting cover 2, and a second connecting pipe 221 is installed on the gas extraction hood 22. The end of the second connecting pipe 221 is connected to the exhaust gas recovery system 14. A one-way valve 212 is installed on the first connecting pipe 211, and a top plate 232 is slidably installed at the end of the first connecting pipe 211. A gas extraction hood 22 is installed at the end of the top plate 232. There is a top rod 231, and the end of the top rod 231 is connected to the accumulator piston 23. After the top plate 232 and the suction piston 222 are separated from the first connecting pipe 211 and the second connecting pipe 221 respectively, the inflation and deflation are ensured. A partition 235 is installed inside the mounting cover 2. The partition 235 is movably connected to the synchronizing rod 233. A return spring 234 is sleeved on the synchronizing rod 233. One end of the return spring 234 is locked on the accumulator piston 23, and the other end of the return spring 234 is locked on the partition 235. The gas accumulator 21 supplies gas through the first connecting pipe 211, and the gas extraction hood 22 exhausts gas through the second connecting pipe 221. The accumulator piston 23 drives the top rod 231 to separate the top plate 232 from the first connecting pipe 211, and the gas extraction piston 222 separates from the second connecting pipe 221. The one-way valve 212 prevents backflow, and the return spring 234 pushes the accumulator piston 23 to return to its original position after it slides, which improves the smoothness of inflation and deflation and ensures the orderly flow of gas.

[0051] Example 3, based on the above examples and the differences between this example and the following: Figure 7 and Figure 10 As shown, an inspection door 213 is bolted to the mounting cover 2, and a handle 214 is installed on the inspection door 213. A drive motor 31 is installed inside the mounting cover 2, and a transmission shaft 311 is installed at the output end of the drive motor 31. The end of the transmission shaft 311 is connected to the turntable 3. The guide block 32 has inclined surfaces 321 at both ends, and an arc surface 322 connects the inclined surfaces 321. The central angle of the arc surface 322 corresponds to the central angle of the top block 33. The inspection door 213 is opened via the handle 214 for easy inspection of internal components. The drive motor 31 drives the turntable 3 to rotate via the transmission shaft 311. The inclined surfaces 321 of the guide block 32 gradually compress the accumulator piston 23, while the arc surface 322 maintains the position of the accumulator piston 23. The top block 33 rotates with the turntable 3, lifting the push rod 34, ensuring the smooth sliding of the accumulator piston 23 and the orderly lifting of the push rod 34, thus improving the stability of the equipment operation.

[0052] like Figure 7 and Figure 8As shown, in a specific embodiment, a push plate 341 is installed on the top of the push rod 34, and the push plate 341 is placed at the bottom of the suction block 342. A ball bearing 331 is installed at the bottom of the push rod 34, and the ball bearing 331 fits against the top block 33. A pressure plate 343 is installed on the push rod 34, and a storage spring 344 is sleeved on the push rod 34. One end of the storage spring 344 is engaged inside the mounting cover 2, and the other end is engaged on the pressure plate 343. The top block 33 lifts the push rod 34 through the ball bearing 331, and the push plate 341 pushes the suction block 342 upward. When the push rod 34 moves upward, the pressure plate 343 compresses the storage spring 344. After the top block 33 leaves, the storage spring 344 resets, causing the push rod 34 to move downward. This reduces the friction between the top block 33 and the push rod 34, ensures the automatic reset of the push rod 34, and improves the smoothness of equipment operation.

[0053] like Figure 7 , Figure 8 and Figure 9 As shown, the suction block 342 further includes a cylindrical inner cavity, and a piston plate 35 is slidably disposed within the suction block 342. A piston rod 351 is mounted at the bottom of the piston plate 35, with its end movably passing through a push rod 34. A fixing bracket 352 is mounted on the side wall of the piston rod 351. The fixing bracket 352 is L-shaped and movably passes through a through slot 353 on the side wall of the push rod 34. The top of the fixing bracket 352 is mounted at the bottom of the mounting cover 2. When the suction block 342 moves upward, the piston rod 351 is fixed by the fixing bracket 352, causing the piston plate 35 to slide downward relative to the piston plate 342, increasing the internal space, reducing air pressure, and enhancing suction. When the temperature returns to room temperature, the gas expands, pushing the piston plate 35 upward, reducing the space, increasing air pressure, and decreasing suction. The through slot 353 provides movement space for the fixing bracket 352, realizing automatic adjustment of the suction force of the suction block 342, ensuring transfer stability and convenient item retrieval.

[0054] This invention discloses a method for testing the thermal shock resistance performance of a three-way catalytic converter, comprising the following steps:

[0055] Step 1: Equipment installation and debugging. Fix the workbench 1 and check the connection between the engine exhaust simulation system 13, exhaust gas recovery system 14 and the workbench 1, as well as the operation of components such as the internal storage piston 23, exhaust piston 222, and turntable 3 inside the mounting cover 2, to ensure that the equipment is normal. At the same time, debug the CCD camera 112 with intelligent detection function (calibrate its shooting angle, clarity and abnormal feature recognition algorithm to ensure that it can accurately capture the external state of the three-way catalytic converter) and the laser displacement detection sensor 113 with intelligent detection function (calibrate its laser emission position, axial displacement detection accuracy and threshold alarm parameters to ensure that it can accurately collect the axial displacement data of the workpiece). Ensure that the equipment and intelligent detection components are operating normally.

[0056] Step 2: The three-way catalytic converter is clamped and fixed. The three-way catalytic converter is initially positioned by the first mounting bracket 17 and the second mounting bracket 18 on the support plate 16. Then, the electric push rod 191 of the clamping assembly drives the arc-shaped clamping plate 192 to clamp it. If necessary, the angle of the electric push rod 191 can be adjusted by the crank handle 1994. After clamping, the laser displacement detection sensor 113 is activated to record the initial axial position data of the three-way catalytic converter, which will serve as a reference for subsequent testing.

[0057] Step 3: High-temperature operating condition simulation. The engine exhaust simulation system 13 generates high-temperature exhaust gas, which is then introduced into the three-way catalytic converter, raising its temperature to 400-1000℃ and maintaining it, simulating high-load driving. During this process, the laser displacement detection sensor 113 monitors the axial displacement change of the three-way catalytic converter in real time. If the displacement exceeds the preset threshold, an alarm is automatically triggered and the current high-temperature parameters are recorded. At the same time, the CCD camera 112 can intermittently photograph the external condition of the three-way catalytic converter to initially monitor whether abnormalities such as coating bulging occur under high temperature.

[0058] Step 4: Low-temperature impact simulation. The engine exhaust simulation system 13 and exhaust gas recovery system 14 are shut down, and the cold air cooling system 15 is activated to cause a rapid drop in the temperature of the three-way catalytic converter casing, simulating a rapid cooling environment. During this stage, the laser displacement detection sensor 113 continuously collects axial displacement data to capture the displacement changes of the three-way catalytic converter caused by thermal expansion and contraction during the rapid temperature drop. Simultaneously, the CCD camera 112 captures images to monitor for initial damage such as external cracks and coating peeling under low-temperature impact.

[0059] Step 5: Repeat the thermal shock test, repeating steps 3 and 4 multiple times to subject the three-way catalytic converter to multiple alternating thermal shocks; the laser displacement detection sensor 113 automatically stores the axial displacement data of each working condition stage to form a displacement change curve; the CCD camera 112 takes pictures at a preset frequency and compares and analyzes the differences in external state under different cycles, automatically marking suspected damage areas and the time of occurrence.

[0060] Step Six: Exhaust Gas Treatment and Removal. After the inspection is completed, the drive motor 31 is started, and the exhaust gas is purged and recovered through components such as the guide block 32 and the accumulator piston 23. The clamping assembly is unlocked, and the suction block 342 adsorbs the three-way catalytic converter and separates it from the work station. After the temperature returns to room temperature, the three-way catalytic converter is removed. Finally, the CO / HC / NOx conversion rate decay rate is detected by endoscope and catalytic performance test bench, and the change in the bending strength of the carrier is detected by mechanical testing equipment. Combined with the axial displacement data recorded by the laser displacement detection sensor 113 (to evaluate structural stability) and the intelligent detection results of the CCD camera 112 (to assist in judging external damage), the thermal shock resistance performance of the three-way catalytic converter is comprehensively evaluated.

[0061] The implementation principle of the thermal shock resistance testing device for a three-way catalytic converter according to the present invention is as follows:

[0062] First, using a pair of positioning blocks 161 on the workbench 1, the support plate 16 is securely installed on it with bolts. The operator can easily move the support plate 16 using the handle 162. The first mounting bracket 17 at one end of the support plate 16 and the second mounting bracket 18 at the top of the upright 181 at the other end contact the end face of the three-way catalytic converter to achieve initial positioning. At the same time, the clamping components installed on the upright plate 163 on the support plate 16 and the synchronization frame 171 further clamp and fix the end of the three-way catalytic converter.

[0063] In the clamping assembly, the output rod of the electric push rod 191 pushes the synchronous plate 198 to move. The synchronous plate 198 drives the slide rod 196 to slide in the strip groove 195 of the swing arm 194 through the U-shaped frame 197, thereby causing the swing arm 194 and the auxiliary arm 193 to rotate around the inner side wall of the positioning frame 19, and finally allowing the arc-shaped clamping plate 192 at the end to clamp the end of the three-way catalytic converter.

[0064] If the angle of the electric actuator 191 needs to be adjusted, the crank handle 1994 can be rotated to drive the knob 1993 to rotate, so that the knob 1993 moves on the stud 1992. When the knob 1993 is in contact with the fixed base 1991, the angle of the electric actuator 191 can be positioned. The fixed base 1991 is installed on the housing of the electric actuator 191, and the smooth surface of the stud 1992 is rotatably connected to the fixed base 1991. The boss 1990 is installed on the timing frame 171 to provide support for the knob 1993.

[0065] Once the positioning is complete, the operator first simulates a high-temperature operating condition by introducing the high-temperature exhaust gas generated in the engine exhaust simulation system 13 into the three-way catalytic converter, and then discharging it along the three-way catalytic converter into the exhaust gas recovery system 14. As the high-temperature exhaust gas continues to flow in, the overall temperature of the three-way catalytic converter gradually rises to 400-1000℃ (simulating the operating temperature of a vehicle under high load). After the three-way catalytic converter reaches the set high temperature and maintains it for a period of time (simulating continuous high-load conditions), it needs to switch to the low-temperature shock stage. At this time, the engine exhaust simulation system 13 and the exhaust gas recovery system 14 are shut down, and then the cold air cooling system 15 is activated, spraying liquid nitrogen onto the surface or internal channels of the three-way catalytic converter, causing the temperature of the three-way catalytic converter to drop rapidly from high temperature in a short time (simulating rapid cooling after sudden rain or extreme cold conditions following high-load driving).

[0066] After repeated cycles of hot and cold, the internal condition is observed through an endoscope, while the external condition is observed through a CCD camera 112 with intelligent detection function (which can automatically identify abnormal features such as color changes in the external coating of the three-way catalytic converter and minor surface damage, and generate a preliminary inspection report). The indicators observed are whether cracks appear on the three-way catalytic converter carrier and whether the coating peels off. At the same time, a laser displacement detection sensor 113 with intelligent detection function is activated. It emits a laser beam to irradiate the key axial detection points of the three-way catalytic converter and collects the axial displacement data of the workpiece in real time during the hot and cold shock. If the displacement exceeds the preset threshold, an alarm will be automatically triggered and the stage of the abnormal displacement will be recorded, providing data support for subsequent analysis of the structural stability of the three-way catalytic converter. Finally, the decay rate of CO, HC, and NOx conversion rates is detected by a catalytic performance test bench, and the change in the bending strength of the carrier is detected by a mechanical testing device. Finally, the hot and cold shock resistance performance of the three-way catalytic converter is comprehensively evaluated based on the above indicators.

[0067] After the repeated tests are completed, the final step is to cool the three-way catalytic converter using the cold air cooling system 15. At this time, the three-way catalytic converter contains a large amount of exhaust gas. Since the engine exhaust simulation system 13 has been shut down, the exhaust gas cannot be normally delivered to the exhaust gas recovery system 14, and the operator starts the drive motor 31.

[0068] The output of the drive motor 31 drives the turntable 3 to rotate via the transmission shaft 311. The guide block 32 on the side wall of the turntable 3 rotates accordingly. The inclined surfaces 321 at both ends of the guide block 32 first contact the accumulator piston 23 and gradually compress it, causing the accumulator piston 23 to slide inside the mounting cover 2. During the sliding process, the accumulator piston 23 compresses the chamber inside the mounting cover 2, causing the air pressure inside the chamber to gradually increase. Since the accumulator piston 23 and the suction piston 222 are connected by the synchronizing rod 233, the suction piston 222 also slides synchronously. When the suction piston 222 slides, it will stretch the internal space of the suction cover 22, thereby creating a negative pressure inside the suction cover 22. At this time, the return spring 234 on the synchronizing rod 233 is compressed by the accumulator piston 23 and begins to accumulate elastic potential energy. As the accumulator piston 23 continues to slide, the push rod 231 drives the top plate 232 to slide within the first connecting pipe 211. When the top plate 232 separates from the first connecting pipe 211, the gas in the compressed chamber inside the mounting cover 2 can be blown into the three-way catalytic converter along the first connecting pipe 211, achieving preliminary purging of the residual exhaust gas inside the three-way catalytic converter. At the same time, the suction piston 222 separates from the second connecting pipe 221 during synchronous sliding. The negative pressure inside the suction cover 22 acts on the three-way catalytic converter through the second connecting pipe 221, drawing the residual exhaust gas pushed by the gas during the preliminary purging process towards the suction cover 22, accelerating the discharge of exhaust gas. Finally, the residual exhaust gas is recovered into the mounting cover 2.

[0069] When the arc surface 322 of the guide block 32 contacts the accumulator piston 23, the accumulator piston 23 stops sliding. At this time, the clamping assembly begins to unlock, the output rod of the electric push rod 191 retracts, driving the synchronous plate 198, the U-shaped frame 197 and the slide rod 196 to move, causing the swing arm 194 to rotate in the opposite direction to the auxiliary arm 193, and the arc-shaped clamping plate 192 at the end to loosen its clamping on the end of the three-way catalytic converter, thus releasing the fixation.

[0070] As the turntable 3 continues to rotate, the top block 33 on it begins to contact the rolling ball 331 at the bottom of the push rod 34, lifting the push rod 34 upwards. The upward movement of the push rod 34 causes the push plate 341 and the suction block 342 to move upwards synchronously, and the suction block 342 gradually approaches and contacts the bottom of the three-way catalytic converter. During the upward movement of the suction block 342, because the piston rod 351 is fixedly connected to the bottom of the mounting cover 2 via the fixing bracket 352, the piston rod 351 cannot move upwards with the suction block 342, thus causing the piston plate 35 to slide downwards relative to the suction block 342. This relative sliding increases the volume of the enclosed space inside the suction block 342, reduces the internal gas pressure, and creates a negative pressure, significantly increasing the suction force of the suction block 342 on the three-way catalytic converter. During the upward movement of the suction block 342, it causes the three-way catalytic converter to move synchronously, separating it from the first mounting bracket 17, the second mounting bracket 18, etc., on the testing station, making it easier for operators to remove later.

[0071] During the process of the three-way catalytic converter cooling down and returning to room temperature, the gas inside the suction block 342 expands due to heat, the piston plate 35 slides upward relative to the suction block 342, the internal space of the suction block 342 decreases relatively, the gas pressure increases, the suction force on the three-way catalytic converter decreases, and the operator can easily remove the three-way catalytic converter from the suction block 342.

Claims

1. A device for testing the thermal shock resistance of a three-way catalytic converter, comprising a workbench (1), on which an engine exhaust simulation system (13) and an exhaust gas recovery system (14) connected to the three-way catalytic converter are respectively installed, as well as a cold air cooling system (15) for rapidly cooling the three-way catalytic converter, and a CCD camera (112) for detecting the state of the workpiece is also installed on the workbench (1), characterized in that: The bottom of the workbench (1) is equipped with a mounting cover (2). The two ends of the mounting cover (2) are connected to the engine exhaust simulation system (13) and the exhaust gas recovery system (14) respectively. A accumulator piston (23) and an exhaust piston (222) are slidably arranged inside the mounting cover (2). A synchronizing rod (233) is installed between the accumulator piston (23) and the exhaust piston (222). The accumulator piston (23) and the exhaust piston (222) are slidably used to charge and exhaust the three-way catalytic converter and recover the residual exhaust gas into the mounting cover (2). One end of the mounting cover (2) is equipped with a gas storage cover (21), and a first connecting pipe (211) is installed on the gas storage cover (21). The end of the first connecting pipe (211) is connected to the engine exhaust simulation system (13). The other end of the mounting cover (2) is equipped with a suction cover (22), and a second connecting pipe (221) is installed on the suction cover (22). The end of the second connecting pipe (221) is connected to the exhaust gas recovery system (14). A one-way valve (212) is installed on the first connecting pipe (211). A top plate (232) is slidably installed at the end of the first connecting pipe (211). The top plate (232) is... A top rod (231) is installed at the end, and the end of the top rod (231) is connected to the accumulator piston (23). After the top plate (232) and the suction piston (222) are separated from the first connecting pipe (211) and the second connecting pipe (221) respectively, the inflation and deflation are ensured. A partition plate (235) is installed inside the mounting cover (2). The partition plate (235) and the synchronizing rod (233) are movably connected through each other. A return spring (234) is sleeved on the synchronizing rod (233). One end of the return spring (234) is clamped on the accumulator piston (23), and the other end of the return spring (234) is clamped on the partition plate (235). The mounting cover (2) is rotatably mounted with a turntable (3), and a guide block (32) is mounted on the side wall of the turntable (3). The guide block (32) rotates to compress the storage piston (23) to slide. A top block (33) is mounted on the turntable (3). The top block (33) is used to lift the push rod (34) inserted on the mounting cover (2) to move upward. A suction block (342) is mounted on the push rod (34). The suction block (342) is used to lift the three-way catalytic converter to move upward. A piston plate (35) connected to the mounting cover (2) is installed inside the suction block (342) to increase the suction force during the upward movement of the suction block (342) and to reduce the suction force when the room temperature is restored.

2. The thermal shock resistance testing device for a three-way catalytic converter according to claim 1, characterized in that, Four support legs (11) are installed at the bottom corner of the workbench (1). Each support leg (11) is equipped with an anti-slip mat (111) at the bottom. The anti-slip mat (111) is in the shape of a boss. A guardrail (12) is installed on the workbench (1). A bracket (121) is installed on the guardrail (12). A crossbeam (122) is installed on the top of the workbench (1).

3. The thermal shock resistance testing device for a three-way catalytic converter according to claim 1, characterized in that, A pair of positioning blocks (161) are installed on the workbench (1). A support plate (16) is screwed onto the surface of the pair of positioning blocks (161) by bolts. A handle (162) is installed on the support plate (16). A first mounting bracket (17) is installed on one end of the support plate (16). A synchronization bracket (171) is installed on the first mounting bracket (17). A vertical rod (181) is installed on the other end of the support plate (16). A second mounting bracket (18) is installed on the top of the vertical rod (181). The second mounting bracket (18) and the first mounting bracket (17) are in contact with the end face of the three-way catalytic converter. A vertical plate (163) is installed on the support plate (16). A clamping assembly is installed on both the vertical plate (163) and the synchronization bracket (171). The clamping assembly is used to clamp the end of the three-way catalytic converter.

4. The thermal shock resistance testing device for a three-way catalytic converter according to claim 3, characterized in that, The clamping assembly includes a positioning frame (19) for positioning, and the positioning frame (19) is connected to the synchronization frame (171). The positioning frame (19) is U-shaped, and a pair of parallel auxiliary arms (193) and swing arms (194) are rotatably mounted on the inner side wall of the positioning frame (19). The ends of the auxiliary arms (193) and swing arms (194) are equipped with clamping plates (192), and the clamping plates (192) are arc-shaped. A strip groove (195) is opened on the swing arm (194), and a slide rod (196) is slidably arranged on the strip groove (195). A component is mounted on the slide rod (196). A U-shaped frame (197) is provided with a synchronization plate (198) at one end. An electric push rod (191) is provided at one end of a positioning frame (19). The output rod of the electric push rod (191) is movably connected to the positioning frame (19), and the output end of the electric push rod (191) is connected to the synchronization plate (198). A laser displacement detection sensor (113) is also provided on the worktable (1), and the laser displacement detection sensor (113) is aligned with the workpiece held by the clamping assembly. The laser displacement detection sensor (113) is used to detect the axial displacement of the workpiece during the process.

5. The thermal shock resistance testing device for a three-way catalytic converter according to claim 4, characterized in that, The electric push rod (191) has a fixed base (1991) installed on its outer shell. The synchronous frame (171) has a boss (1990) installed on it. The fixed base (1991) fits against the side wall of the boss (1990). A stud (1992) is installed on the boss (1990). The smooth surface of the stud (1992) without threads is rotatably connected to the fixed base (1991). A knob (1993) is screwed onto the threaded position on the stud (1992). A crank (1994) is installed on the knob (1993). Rotating the knob (1993) and making it fit against the fixed base (1991) positions the electric push rod (191) at an angle.

6. The thermal shock resistance testing device for a three-way catalytic converter according to claim 1, characterized in that, An inspection door (213) is bolted to the mounting cover (2), and a handle (214) is installed on the inspection door (213). A drive motor (31) is installed inside the mounting cover (2), and a transmission shaft (311) is installed at the output end of the drive motor (31). The end of the transmission shaft (311) is connected to the turntable (3). Inclined surfaces (321) are provided at both ends of the guide block (32), and an arc surface (322) is connected between the inclined surfaces (321). The central angle of the arc surface (322) corresponds to the central angle of the top block (33).

7. The thermal shock resistance testing device for a three-way catalytic converter according to claim 1, characterized in that, A push plate (341) is installed on the top of the push rod (34), the push plate (341) is placed at the bottom of the suction block (342), a ball (331) is installed at the bottom of the push rod (34), the ball (331) is in contact with the top block (33), a pressure plate (343) is installed on the push rod (34), and a storage spring (344) is sleeved on the push rod (34). One end of the storage spring (344) is snapped into the inside of the mounting cover (2), and the other end of the storage spring (344) is snapped into the pressure plate (343).

8. The thermal shock resistance testing device for a three-way catalytic converter according to claim 1, characterized in that, The suction block (342) has a cylindrical inner cavity, and the piston plate (35) is slidably disposed in the suction block (342). A piston rod (351) is installed at the bottom of the piston plate (35). The end of the piston rod (351) moves through the push rod (34), and a fixing frame (352) is installed on the side wall of the piston rod (351). The fixing frame (352) is L-shaped and moves through the through groove (353) opened on the side wall of the push rod (34). The top of the fixing frame (352) is installed at the bottom of the mounting cover (2).

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