Testing device for particulate matter sensor

Abstract

The invention discloses a testing device for a particulate matter sensor, and relates to the technical field of testing devices for particulate matter sensors, the testing device for the particulate matter sensor comprises a workbench, and a box body is fixed on the upper surface of the workbench. According to the testing device for the particulate matter sensor, when dust is introduced into the box body, the fan blows the dust, and the guide plate on the distribution plate is matched to guide the dust, so that the dust is dispersed around the distribution plate, the situation that the dust is blown by the fan for a long time to form circulation and cannot be dispersed around is avoided, and then the cam is driven by the driving motor to rotate; and through cooperation of a connecting rod, a sliding block, a first hinge rod, an extrusion block and a top block, a distribution plate rotates intermittently, dust on the upper surface of the distribution plate is poured down, so that the dust in the box body is distributed more uniformly, and the problems that after the dust is sprayed into the box body, only a fan is used for diffusion, air flow circulation is caused, and dust distribution is not uniform are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test devices for particulate matter sensors, in particular to a test device for particulate matter sensors. BACKGROUND

[0002] With the acceleration of industrialization and the increasing environmental problems, the concentration monitoring of particulate matters (such as PM2.5, PM10, etc.) in the air has become an important link in the fields of environmental protection, human health protection, and industrial production control. As a core device that can detect the concentration of particulate matters in the air in real time, particulate matter sensors are widely used in air purifiers, fresh air systems, environmental monitoring equipment, automobile air conditioning systems, etc. The detection accuracy and stability of the particulate matter sensors directly affect the performance and use effect of the related equipment.

[0003] Patent No. CN114295681B, a test device suitable for dust characteristic research of electrochemical gas sensor, includes: dust characteristic test box, dust injection device, gas cylinder and gas collection bottle; the dust characteristic test box includes a box body, a box cover, a fan and an electric heater, the fan and the electric heater are installed in the box body, the box cover is sealed and covered on the box body, the electrochemical gas sensor to be tested is placed in the box body, the box body is provided with an air inlet hole, an air outlet hole and a dust inlet hole; the dust injection device is connected with the dust inlet hole of the box body; the gas cylinder is connected with the air inlet hole of the box body through an air inlet pipe; the gas collection bottle is connected with the air outlet hole of the box body. The test device can well study the influence of dust particles on the measurement accuracy and failure degree of the electrochemical gas sensor, and provide a basis for the selection and service life of the gas sensor of the atmospheric monitoring system in the industrial pollution area of the coal gangue power plant.

[0004] However, the above-mentioned device only blows the airflow by the fan, so that the airflow drives the dust to move. Long-term use may cause the airflow to flow in one direction, forming a cycle, and it is difficult to ensure that the dust is evenly distributed inside the box. In actual environment, the dust is generally dynamically and evenly distributed, and the natural settlement after stirring by the fan has a large difference with the distribution mode of the dust in the actual environment. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a test device for particulate matter sensors, which solves the problems raised in the background art.

[0006] In order to achieve the above object, the present application is realized by the following technical scheme: A kind of testing device for particulate matter sensor, including workbench, the upper surface of the workbench is fixed with box, the side wall of the box is equipped with dust inlet hole, the upper surface of the workbench is fixed with dust injection pipe, the dust injection pipe is communicated with dust inlet hole, the upper surface of the workbench is fixed with waste gas treatment device, the waste gas treatment device is communicated with box, the side of the workbench is placed with air inlet device, the air inlet device is communicated with box, the upper surface of the box is attached with sealing cover, the bottom of the sealing cover is fixed with fan, the side wall of the box is penetrated with heating pipe, and fixed connection is achieved at penetration, the inside of the box is provided with diffusion device for facilitating diffusion dust distribution range, the inside of the box is provided with simulation device for clamping sensor from side, the inside of the box is provided with rotating device for assisting sensor to test in all aspects; Wherein, the diffusion device includes drive motor, cam, connecting rod, sliding block, first hinged rod, extrusion block, top block, support spring, distribution plate, top rod and knocking rod, the drive motor is fixedly connected to the side wall of the box, the output end of the drive motor is fixed with rotating rod, the rotating rod penetrates the side wall of the box, and rotationally connected is achieved at penetration, drive motor is started to drive rotating rod to rotate.

[0007] According to the above technical scheme, the cam is fixedly connected to the end of the rotating rod away from the drive motor, one end of the connecting rod penetrates the cam, and rotationally connected is achieved at penetration, the bottom of the sliding block is hinged to the other end of the connecting rod, the sliding block is slidingly connected to the side wall of the inner wall of the box, when the cam rotates, the sliding block is pushed to slide up and down by the connecting rod.

[0008] According to the above technical scheme, the first hinged rod is hinged to the side wall of the sliding block, the extrusion block is slidingly connected to the side wall of the inner wall of the box, the bottom of the extrusion block is hinged to the end of the first hinged rod away from the sliding block, the top block is slidingly connected to the side wall of the inner wall of the box, one end of the support spring is fixedly connected to the bottom of the top block, when the sliding block slides, the top block is pushed to slide by the first hinged rod and the extrusion block.

[0009] According to the above technical scheme, the other end of the support spring is fixedly connected to the protrusion of the inner wall of the box, the side wall of the distribution plate is hinged to the side wall of the inner wall of the box, the distribution plate is equipped with through slot, the upper surface of the distribution plate is fixed with guide plate, the top rod is fixedly connected to the upper surface of the sliding block, the knocking rod is rotationally connected to the side wall of the inner wall of the box, the sliding block pushes the knocking rod to rotate by the top rod.

[0010] According to the technical scheme, the simulation device comprises a three-fold lever, a reset spring, a second hinged lever, a spoiler, a rotating shaft, a rotating disc, a compression spring, a clamping block and a clamping plate, the three-fold lever is slidingly connected to the side wall of the inner wall of the box, the inner wall of the box is provided with a groove, one end of the reset spring is fixedly connected to the side wall of the groove, and the cam is rotated to push the three-fold lever to slide.

[0011] According to the technical scheme, the other end of the reset spring is fixedly connected to the protrusion of the side wall of the three-fold lever, the second hinged lever is hinged to the side wall of the three-fold lever, the spoiler is hinged to the side wall of the inner wall of the box, one end of the second hinged lever away from the three-fold lever is hinged to the side wall of the spoiler, the rotating shaft is rotatably connected to the side wall of the inner wall of the box, and the three-fold lever slides to drive the spoiler to swing through the second hinged lever.

[0012] According to the technical scheme, the rotating disc is fixedly connected to one end of the rotating shaft away from the inner wall of the box, one end of the compression spring is fixedly connected to the protrusion of the side wall of the rotating disc, the clamping block penetrates through the rotating disc and is slidingly connected at the penetration position, the upper surface of the clamping block is fixedly connected to the other end of the compression spring, and the clamping plate is hinged to the side wall of the clamping block.

[0013] According to the technical scheme, the rotating device comprises a push rod, a return spring, a third hinged lever, a semicircular ball, a fixed plate and a spring rod, the push rod penetrates through the clamping block and is slidingly connected at the penetration position, one end of the return spring is fixedly connected to the protrusion of the side wall of the push rod, the other end of the return spring is fixedly connected to the side wall of the clamping block, and the third hinged lever is hinged to the side wall of the push rod.

[0014] According to the technical scheme, one end of the third hinged lever away from the push rod is hinged to the bottom surface of the clamping plate, the side wall of the inner wall of the box is fixedly provided with a long rod, the semicircular ball is fixedly connected to one end of the long rod away from the inner wall of the box, the fixed plate is fixedly connected to the outer wall of the rotating disc, and the spring rod is fixedly connected to the upper surface of the three-fold lever.

[0015] The application provides a test device for a particulate matter sensor, and has the following beneficial effects: 1、The present application is provided with diffusion device, in the dust into the box, through the fan blowing dust, and then cooperate with the guide plate on the distribution plate on the dust guide, make the dust scattered in the distribution plate around, avoid dust by fan blowing cycle, can not be dispersed to the four around, and then through the drive motor cam rotation, cooperate with connecting rod, sliding block, first hinge rod, extrusion block and top block make the distribution plate intermittent rotation, the dust on its upper surface down, so that the dust distribution in the box more uniform, solved the dust in the spray into the box, only using the fan for diffusion, resulting in air circulation, uneven distribution of dust problem; In the distribution plate rotation makes the dust fall, cooperate with the top bar and knocking bar on the distribution plate, promote the distribution plate on the dust fall, thereby avoiding the dust hanging wall accumulation, cause the through slot blockage, solved the dust quality is lighter, in a short period of time can not all down problem.

[0016] 2、The present application is provided with simulation device, in the sensor test, the sensor is clamped in the center through three groups of clamping block cooperate with the clamping plate, make the bottom of the sensor not with any object, make the bottom of the sensor can also participate in the test, thereby increasing the sensor test when its outer wall and the contact area of the dust, improve the accuracy of the detection data when testing the sensor, solved the sensor directly placed in the box when some area difficult to accept the test problem; In the sensor test, cooperate with the three bar, reset spring and the second hinge rod drive the spoiler rotation, disturbance to the airflow at the bottom of the box, make the airflow drive dust movement at the bottom of the box, thereby avoiding the dust from the distribution plate after falling in the box, static at the bottom, can not contact the bottom surface of the sensor, solved the sensor test when the bottom can not contact the dust problem.

[0017] 3、The present application is provided with rotating device, in the sensor test, through the sliding of the three bar drive spring rod movement, cooperate with the fixed plate drive the rotating disc rotation, make the rotating disc drive sensor rotation, make the sensor in detection, its outer wall everywhere can contact with different area of dust, so that the sensor and dust contact more uniform, avoid because the sensor outer wall everywhere and the contact concentration of dust is not consistent, resulting in detection data error, solved the sensor detection when the dust concentration is not uniform, resulting in large data error problem; In the rotating disc drive sensor rotation, cooperate with the push rod, return spring, third hinge rod and semicircle ball make the clamping plate on the upper side of the folding open, thereby avoiding the clamping plate on the side wall of the sensor shielding, resulting in detection data error, solved the sensor clamping place can not contact the dust, easy to lead to detection data error problem. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall structure of the present application is shown in the figure; Figure 2 It is a schematic diagram of the box structure of the present application; Figure 3 It is a schematic diagram of the partial cross-section structure of the present application; Figure 4 It is a schematic diagram of the internal structure of the box of the present application; Figure 5 It is a schematic diagram of the box of the present application Figure 4 It is a schematic diagram of the local enlarged structure of area A; Figure 6 It is a schematic diagram of the half cross-section structure of the box of the present application; Figure 7 It is a schematic diagram of the rotating device structure of the present application.

[0019] In the figure: 1, workbench; 2, box; 3, dust inlet hole; 4, dust injection pipe; 5, sealing cover; 6, heating pipe; 71, driving motor; 72, cam; 73, connecting rod; 74, sliding block; 75, first hinged rod; 76, extrusion block; 77, top block; 78, supporting spring; 79, distribution plate; 710, top rod; 711, knocking rod; 81, three-fold rod; 82, return spring; 83, second hinged rod; 84, spoiler; 85, rotating shaft; 86, rotating disc; 87, extrusion spring; 88, clamping block; 89, clamping plate; 91, push rod; 92, return spring; 93, third hinged rod; 94, semicircular ball; 95, fixed plate; 96, spring rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0021] Please refer to Figures 1-7 An embodiment of the present application is a testing device for a particulate matter sensor, which comprises a workbench 1, the upper surface of the workbench 1 is fixed with a box 2, the side wall of the box 2 is provided with a dust inlet hole 3, the upper surface of the workbench 1 is fixed with a dust injection pipe 4, the dust injection pipe 4 is communicated with the dust inlet hole 3, the upper surface of the workbench 1 is fixed with a waste gas treatment device, the waste gas treatment device is communicated with the box 2, a gas inlet device is placed at the side of the workbench 1, the gas inlet device is communicated with the box 2, the upper surface of the box 2 is attached with a sealing cover 5, the bottom surface of the sealing cover 5 is fixed with a fan, the side wall of the box 2 is penetrated by a heating pipe 6, and the penetration is fixedly connected, and the inside of the box 2 is provided with a diffusion device for conveniently diffusing the dust distribution range.

[0022] The diffusion device includes a drive motor 71, a cam 72, a connecting rod 73, a sliding block 74, a first hinge rod 75, a pressing block 76, a top block 77, a support spring 78, a distribution plate 79, a top rod 710, and a striking rod 711. The drive motor 71 is fixedly connected to the side wall of the housing 2. A rotating rod is fixed to the output end of the drive motor 71, passing through the side wall of the housing 2 and rotatably connected at the point of penetration. The cam 72 is fixedly connected to the end of the rotating rod away from the drive motor 71 via a bearing. When the drive motor 71 starts, it drives the cam 72 to rotate through the rotating rod. One end of the connecting rod 73 passes through the cam 72 and is rotatably connected at the point of penetration. When the cam 72 rotates, it drives the connecting rod 73 to move upwards. The sliding block 74 moves downwards, its bottom surface hinged to the other end of the connecting rod 73. When the connecting rod 73 moves upwards, it pushes the sliding block 74 upwards. The sliding block 74 is slidably connected to the side wall of the inner wall of the housing 2. The first hinge rod 75 is hinged to the side wall of the sliding block 74. When the sliding block 74 slides upwards, it drives the first hinge rod 75 to rotate. The pressing block 76 is slidably connected to the side wall of the inner wall of the housing 2. The bottom surface of the pressing block 76 is hinged to the end of the first hinge rod 75 away from the sliding block 74. The first hinge rod 75 rotates and pushes the pressing block 76 to slide away from the sliding block 74. The top block 77 is slidably connected to the side wall of the inner wall of the housing 2. The pressing block 76 slides and pushes the top block 77 upwards. The supporting spring 78 is fixedly connected to the bottom surface of the top block 77. The pressing block 76 slides upward to stretch the supporting spring 78. The other end of the supporting spring 78 is fixedly connected to the protrusion on the inner wall of the box 2. The side wall of the distribution plate 79 is hinged to the side wall of the inner wall of the box 2. When the top block 77 slides upward, it pushes the distribution plate 79 to rotate around the hinge between the distribution plate 79 and the inner wall of the box 2. The distribution plate 79 has a through groove, and a guide plate is fixed on the upper surface of the distribution plate 79. When the distribution plate 79 is in a horizontal state, the sprayed dust is blown by the fan and dispersed to the surroundings by the guide plate on the upper surface of the distribution plate 79. When it is pushed and rotated by the top block 77, the dust on the upper surface of the distribution plate 79 is dispersed. The slide rod 710 is fixedly connected to the upper surface of the sliding block 74. When the sliding block 74 slides upward, it drives the top rod 710 to move upward. The striking rod 711 is rotatably connected to the side wall of the inner wall of the box 2. When the top rod 710 moves upward to the striking rod 711, it pushes the striking rod 711 to rotate around the upper end. When the striking rod 711 rotates to the distribution plate 79, it impacts the distribution plate 79. When the dust is introduced into the box 2, the dust is blown by the fan and guided by the guide plate on the distribution plate 79, so that the dust is dispersed around the distribution plate 79, avoiding the dust from being blown by the fan for a long time and forming a cycle, which would prevent the dust from being unable to be dispersed around. The driving motor 71 drives the cam 72 to rotate, and cooperates with the connecting rod 73, the sliding block 74, the first hinged rod 75, the extruding block 76 and the top block 77 to make the distribution plate 79 rotate intermittently, so that the dust on the upper surface of the distribution plate 79 falls down, and the dust in the box body 2 is more evenly distributed. When the distribution plate 79 is rotated to make the dust fall down, the top rod 710 and the knocking rod 711 knock the distribution plate 79, so that the dust on the distribution plate 79 falls down, thereby avoiding that the dust is accumulated on the wall to cause the through groove to be blocked, and solving the problem that the dust with light quality cannot fall down completely in a short time.

[0023] The working of the embodiment is as follows: when testing, dust is sprayed from the dust inlet hole 3 through the dust spraying pipe 4, and is diffused to all parts of the box 2, so that it is naturally settled, and the possible situation in the natural environment is simulated, so that the dust is deposited on the surface of the sensor. After the natural settlement is completed, the recorded output value of the sensor, such as current, voltage and concentration indication value, is tested again, and is compared with the output value of the sensor without dust to test the data. The driving motor 71 is started to drive the rotating rod to rotate the cam 72, and the connecting rod 73 rotates around the rotating rod at the through hole of the cam 72. The end of the connecting rod 73 away from the cam 72 is hinged to the bottom surface of the sliding block 74, so that when the connecting rod 73 rotates at the through hole of the cam 72, the connecting rod 73 moves up and down. When the connecting rod 73 moves up, the sliding block 74 slides up, and the first hinge rod 75 moves up at the hinge. The end of the first hinge rod 75 away from the sliding block 74 is hinged to the bottom surface of the extrusion block 76, and the extrusion block 76 can only slide horizontally. Therefore, the hinge point of the first hinge rod 75 and the extrusion block 76 does not change in the vertical direction. When the sliding block 74 slides up, the first hinge rod 75 rotates, and the extrusion block 76 slides away from the sliding block 74. When the extrusion block 76 slides to the top block 77, the inclined surface of the extrusion block 76 and the inclined edge of the top block 77 slide relative to each other. The extrusion block 76 pushes the top block 77 to slide up, and at the same time, the supporting spring 78 is stretched. When the top block 77 slides to the distribution plate 79, the inclined edge of the top block 77 and the bottom surface of the distribution plate 79 slide relative to each other. The distribution plate 79 rotates around the hinge between the distribution plate 79 and the inner wall of the box 2. When the distribution plate 79 is in a horizontal state, the sprayed dust is blown by the fan and dispersed to the surrounding area by the guide plate on the upper surface of the distribution plate 79. When the distribution plate 79 is pushed to rotate by the top block 77, the dust on the upper surface of the distribution plate 79 slides to the through slot and falls down. When the sliding block 74 slides up, the top rod 710 moves up. When the top rod 710 moves up to the knocking rod 711, the upper end of the top rod 710 and the side wall of the knocking rod 711 slide relative to each other, and the knocking rod 711 rotates around the upper end. When the knocking rod 711 rotates to the distribution plate 79, the distribution plate 79 is hit.

[0024] Please refer to Figures 1-7On the basis of the above-mentioned embodiment, in another embodiment of the present application, the inside of the box 2 is provided with a simulation device for clamping the sensor from the side, which comprises a three-fold lever 81, a return spring 82, a second hinged lever 83, a spoiler 84, a rotating shaft 85, a rotating disc 86, a compression spring 87, a clamping block 88 and a clamping plate 89. The three-fold lever 81 is slidingly connected to the side wall of the inner wall of the box 2. When the cam 72 rotates to the three-fold lever 81 at the protruding part thereof, the three-fold lever 81 is pushed to slide away from the cam 72. The inner wall of the box 2 is provided with a groove. One end of the return spring 82 is fixedly connected to the side wall of the groove. The other end of the return spring 82 is fixedly connected to the protruding part of the side wall of the three-fold lever 81. When the three-fold lever 81 slides away from the cam 72, the return spring 82 is compressed. The second hinged lever 83 is hinged to the side wall of the three-fold lever 81. When the three-fold lever 81 slides, the second hinged lever 83 is rotated. The spoiler 84 is hinged to the side wall of the inner wall of the box 2. One end of the second hinged lever 83 away from the three-fold lever 81 is hinged to the side wall of the spoiler 84. When the second hinged lever 83 rotates, the spoiler 84 is pushed to rotate around the hinge between the spoiler 84 and the inner wall of the box 2. The rotating shaft 85 is rotatably connected to the side wall of the inner wall of the box 2. The rotating disc 86 is fixedly connected to one end of the rotating shaft 85 away from the inner wall of the box 2. One end of the compression spring 87 is fixedly connected to the protruding part of the side wall of the rotating disc 86. The clamping block 88 penetrates the rotating disc 86 and is slidingly connected at the penetration part. The upper surface of the clamping block 88 is fixedly connected to the other end of the compression spring 87. When the clamping block 88 is pushed away from the rotating disc 86, the compression spring 87 is compressed. When the sensor is moved to the center of the rotating disc 86, the clamping block 88 is released. The clamping block 88 slides towards the rotating disc 86 under the restoring force of the compression spring 87. The clamping plate 89 is hinged to the side wall of the clamping block 88. The three sets of clamping blocks 88 are close to each other. The sensor is clamped in the center by the clamping plate 89. When the sensor is tested by the simulation device, the sensor is clamped in the center by the three sets of clamping blocks 88 and the clamping plate 89. The bottom of the sensor is not in contact with any object. The bottom of the sensor can also participate in the test. Thus, the contact area between the outer wall of the sensor and the dust during the test of the sensor is increased. The accuracy of the detection data during the test of the sensor is improved. The problem that some areas of the sensor cannot be tested when the sensor is directly placed inside the box 2 is solved. When the sensor is tested, the three-fold lever 81, the return spring 82 and the second hinged lever 83 rotate the spoiler 84. The airflow at the bottom of the box 2 is disturbed. The airflow drives the dust to move at the bottom of the box 2. Thus, the dust that falls from the distribution plate 79 cannot be placed at the bottom of the box 2. The bottom of the sensor cannot be in contact with the dust during the test of the sensor. The problem is solved.

[0025] The inside of the box body 2 is provided with a rotating device for assisting the sensor to test in all aspects, the rotating device comprises a push rod 91, a return spring 92, a third hinged rod 93, a semicircle ball 94, a fixed plate 95 and a spring rod 96, the push rod 91 penetrates through the clamping block 88 and is in sliding connection at the penetration position, one end of the return spring 92 is fixedly connected to the protruding position of the side wall of the push rod 91, the other end of the return spring 92 is fixedly connected to the side wall of the clamping block 88, the push rod 91 is compressed when sliding towards the sensor, the third hinged rod 93 is hinged to the side wall of the push rod 91, the end of the third hinged rod 93 away from the push rod 91 is hinged to the bottom surface of the clamping plate 89, the third hinged rod 93 is rotated when the push rod 91 slides, the third hinged rod 93 pushes the clamping plate 89 to rotate, the clamping plate 89 is lifted up, the side wall of the inner wall of the box body 2 is fixed with a long rod, the semicircle ball 94 is fixedly connected to the end of the long rod away from the inner wall of the box body 2, the clamping block 88 and the push rod 91 are rotated together when the rotating disc 86 rotates, the semicircle ball 94 pushes the push rod 91 to slide towards the sensor when the push rod 91 rotates to the position of the semicircle ball 94, the fixed plate 95 is fixedly connected to the outer wall of the rotating disc 86, the spring rod 96 is fixedly connected to the upper surface of the three-fold rod 81, the spring rod 96 moves away from the rotating disc 86 when the three-fold rod 81 slides, the fixed plate 95 is fixedly connected to the outer wall of the rotating disc 86, the fixed plate 95 is pushed to rotate around the center of the rotating disc 86 when the spring rod 96 moves to the position of the fixed plate 95, the fixed plate 95 rotates to drive the rotating disc 86 to rotate, the clamping block 88 in the inner wall of the rotating disc 86 drives the sensor to rotate, the rotating device drives the spring rod 96 to move through the sliding of the three-fold rod 81 when testing the sensor, the rotating disc 86 is driven to rotate by the fixed plate 95, the sensor is driven to rotate by the rotating disc 86, the outer wall of the sensor can contact the dust in different areas when detecting, so that the sensor contacts the dust more uniformly, avoids the inconsistent contact density of the outer wall of the sensor with the dust in different areas, causes the detection data to have errors, solves the problem that the data error is large due to the uneven dust concentration when the sensor detects; the clamping plate 89 folded upwards is opened when the sensor is driven to rotate by the rotating disc 86, in cooperation with the push rod 91, the return spring 92, the third hinged rod 93 and the semicircle ball 94, so as to avoid that the clamping plate 89 shields the side wall of the sensor and causes the detection data to have errors, solves the problem that the clamping position of the sensor cannot contact the dust and is easy to cause the detection data to have errors.

[0026] When the present embodiment works: when the cam 72 rotates to the position of the three-fold lever 81 at its convex part, the outer wall of the cam 72 and the side wall of the three-fold lever 81 slide with each other, the cam 72 pushes the three-fold lever 81 to slide away from the cam 72, and at the same time, the reset spring 82 is compressed, when the three-fold lever 81 slides, the second hinged lever 83 and the hinge of the three-fold lever 81 move, the end of the second hinged lever 83 away from the three-fold lever 81 is hinged with the side wall of the spoiler 84, and the spoiler 84 can only rotate around the hinge of the spoiler 84 and the inner wall of the box 2, so when the second hinged lever 83 and the hinge of the three-fold lever 81 move, the second hinged lever 83 also rotates, the second hinged lever 83 pushes the spoiler 84 to rotate around the hinge of the spoiler 84 and the inner wall of the box 2, when it is needed to fix the sensor in the box 2, the clamp block 88 is pushed away from the rotating disc 86, the clamp block 88 compresses the extrusion spring 87, and when the sensor is moved to the center of the rotating disc 86, the clamp block 88 is released, the clamp block 88 slides to the rotating disc 86 under the restoring force of the extrusion spring 87, the three sets of clamp blocks 88 move close to each other, and the sensor is clamped in the center by the clamping plate 89, the dust falling from the distribution plate 79 is scattered around the sensor after being disturbed by the spoiler 84, and moves around the sensor to wrap the sensor.

[0027] When the three-fold lever 81 slides, the spring lever 96 moves away from the rotating disc 86, when the spring lever 96 moves to the fixed plate 95, the fixed plate 95 rotates around the center of the rotating disc 86, and when the fixed plate 95 rotates, the rotating disc 86 rotates, the clamp block 88 in the inner wall of the rotating disc 86 rotates with the sensor, the rotating disc 86 rotates with the clamp block 88 and the push rod 91, when the push rod 91 rotates to the half-sphere 94, the inclined surface of the push rod 91 and the outer wall of the half-sphere 94 slide with each other, the half-sphere 94 pushes the push rod 91 to slide to the sensor, and at the same time, the return spring 92 is compressed, when the push rod 91 slides, the third hinged lever 93 and the hinge of the push rod 91 move, the end of the third hinged lever 93 away from the push rod 91 is hinged with the clamping plate 89, and the clamping plate 89 can only rotate around the hinge of the clamp block 88 and the clamping plate 89, so when the push rod 91 slides, the third hinged lever 93 rotates, the third hinged lever 93 pushes the clamping plate 89 to rotate, the clamping plate 89 is lifted up, and the upper part of the sensor is not blocked.

[0028] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A test device for a particulate matter sensor, comprising a workbench (1), characterized in that: The upper surface of the workbench (1) is fixed with a box (2), the sidewall of the box (2) is provided with a dust inlet hole (3), the upper surface of the workbench (1) is fixed with a dust injection pipe (4), the dust injection pipe (4) is communicated with the dust inlet hole (3), the upper surface of the workbench (1) is fixed with a waste gas treatment device, the waste gas treatment device is communicated with the box (2), the side of the workbench (1) is placed with an air inlet device, the air inlet device is communicated with the box (2), the upper surface of the box (2) is attached with a sealing cover (5), the bottom surface of the sealing cover (5) is fixed with a fan, the sidewall of the box (2) is penetrated by a heating pipe (6), and the penetration is fixedly connected, the inside of the box (2) is provided with a diffusion device for facilitating diffusion of dust distribution range, the inside of the box (2) is provided with a simulation device for clamping a sensor from the side, the inside of the box (2) is provided with a rotating device for assisting the sensor to test in all aspects. Wherein, the diffusion device includes drive motor (71), cam (72), connecting rod (73), sliding block (74), first hinged rod (75), extrusion block (76), top block (77), supporting spring (78), distribution plate (79), top rod (710) and knocking rod (711), the drive motor (71) is fixedly connected to the sidewall of the box (2), the output end of the drive motor (71) is fixed with a rotating rod, the rotating rod penetrates the sidewall of the box (2), and the penetration is rotatably connected.

2. The test device for a particulate matter sensor according to claim 1, characterized by: The cam (72) is fixedly connected to the end of the rotating rod away from the drive motor (71) through the bearing, one end of the connecting rod (73) penetrates the cam (72), and the penetration is rotatably connected, the bottom surface of the sliding block (74) is hinged to the other end of the connecting rod (73), and the sliding block (74) is slidingly connected to the sidewall of the inner wall of the box (2).

3. The test device for a particulate matter sensor according to claim 2, characterized by: The first hinged rod (75) is hinged to the sidewall of the sliding block (74), the extrusion block (76) is slidingly connected to the sidewall of the inner wall of the box (2), the bottom surface of the extrusion block (76) is hinged to the end of the first hinged rod (75) away from the sliding block (74), the top block (77) is slidingly connected to the sidewall of the inner wall of the box (2), and one end of the supporting spring (78) is fixedly connected to the bottom surface of the top block (77).

4. The test device for a particulate matter sensor according to claim 3, characterized by: The other end of the supporting spring (78) is fixedly connected to the protrusion of the inner wall of the box (2), the sidewall of the distribution plate (79) is hinged to the sidewall of the inner wall of the box (2), the distribution plate (79) is provided with a through slot, the upper surface of the distribution plate (79) is fixed with a guide plate, the top rod (710) is fixedly connected to the upper surface of the sliding block (74), and the knocking rod (711) is rotatably connected to the sidewall of the inner wall of the box (2).

5. The test device for a particulate matter sensor according to claim 4, characterized by: The simulation device comprises a three-fold lever (81), a reset spring (82), a second hinged lever (83), a spoiler (84), a rotating shaft (85), a rotating disc (86), a pressing spring (87), a clamping block (88) and a clamping plate (89), the three-fold lever (81) is slidingly connected to the side wall of the inner wall of the box (2), the inner wall of the box (2) is provided with a groove, one end of the reset spring (82) is fixedly connected to the side wall of the groove.

6. The test device for a particulate matter sensor according to claim 5, characterized in that: The other end of the reset spring (82) is fixedly connected to the protrusion of the side wall of the three-fold lever (81), the second hinged lever (83) is hinged to the side wall of the three-fold lever (81), the spoiler (84) is hinged to the side wall of the inner wall of the box (2), one end of the second hinged lever (83) away from the three-fold lever (81) is hinged to the side wall of the spoiler (84), the rotating shaft (85) is rotatably connected to the side wall of the inner wall of the box (2).

7. A test device for a particulate matter sensor according to claim 6, characterized in that: The rotating disc (86) is fixedly connected to one end of the rotating shaft (85) away from the inner wall of the box (2), one end of the pressing spring (87) is fixedly connected to the protrusion of the side wall of the rotating disc (86), the clamping block (88) penetrates through the rotating disc (86) and is slidingly connected at the penetration position, the upper surface of the clamping block (88) is fixedly connected to the other end of the pressing spring (87), and the clamping plate (89) is hinged to the side wall of the clamping block (88).

8. The test device for a particulate matter sensor according to claim 7, characterized by: The rotating device comprises a push rod (91), a return spring (92), a third hinged lever (93), a semicircular ball (94), a fixed plate (95) and a spring rod (96), the push rod (91) penetrates through the clamping block (88) and is slidingly connected at the penetration position, one end of the return spring (92) is fixedly connected to the protrusion of the side wall of the push rod (91), the other end of the return spring (92) is fixedly connected to the side wall of the clamping block (88), and the third hinged lever (93) is hinged to the side wall of the push rod (91).

9. The test device for a particulate matter sensor according to claim 8, characterized by: One end of the third hinged lever (93) away from the push rod (91) is hinged to the bottom surface of the clamping plate (89), the side wall of the inner wall of the box (2) is fixedly provided with an elongated rod, the semicircular ball (94) is fixedly connected to one end of the elongated rod away from the inner wall of the box (2), the fixed plate (95) is fixedly connected to the outer wall of the rotating disc (86), and the spring rod (96) is fixedly connected to the upper surface of the three-fold lever (81).

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