Filter dust holding test device capable of automatically and quantitatively generating dust and use method of filter dust holding test device

Abstract

The invention provides an automatic quantitative dust generating device and a use method thereof, aiming at the problems of non-uniform dust supply, low quantitative precision, insufficient automation and poor adaptability of a filter dust holding test device. The device comprises a dust quantitative supply assembly (a detachable dust generating disc, a first servo motor, a ball bearing and a disc provided with concentric circular grooves with equal width and depth), a dust pneumatic conveying assembly (a Venturi dust collection unit, a radial movement mechanism and a second servo motor), a test air duct assembly (a pre-filter, a test filter, a tail end filter and the like) and a control assembly. The control assembly coordinates actions of the components, the Venturi unit sucks dust circle by circle under negative pressure, the dust generating disc rotates reversely to uniformize dust, and differential pressure monitoring and early warning are achieved. The method comprises the steps of dust generating disc installation, filling and positioning, airflow establishment, circle-by-circle dust extraction and speed regulation, differential pressure monitoring and stopping control, and cleaning and resetting. The device is accurate in quantification, uniform in conveying, high in automation and high in adaptability, and the test efficiency and reliability are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of filter performance testing equipment, and in particular relates to an automated quantitative dust generation filter dust holding capacity test device and its usage method. Background Technology

[0002] In air filter performance testing, the dust holding capacity test is a crucial method for evaluating the filter's dust collection ability. Existing dust-generating devices mostly employ vibration or screw conveyors to supply dust, but these suffer from uneven dust distribution, low quantitative control accuracy, susceptibility to clogging, and insufficient automation. In particular, their poor adaptability under varying airflow and dust concentration conditions leads to reduced test repeatability and reliability. Furthermore, manual operation is cumbersome and prone to human error, failing to meet the demands of modern testing for high efficiency and precision. Therefore, an automated device capable of quantitative dust storage, uniform delivery, and intelligent control is needed to improve the overall performance of filter dust holding capacity tests. Summary of the Invention

[0003] To address the problems of uneven dust supply, low quantitative control accuracy, insufficient automation, and poor adaptability to different test conditions in existing filter dust holding test devices, this invention aims to provide an automated quantitative dust generating device that is compact in structure, accurate in dust generation, highly automated, and highly adaptable. It can realize the quantitative storage and suction and transportation of dust in each cycle, and ensure the stability and reliability of the test process by coordinating the actions of each component through intelligent control.

[0004] To achieve the above objectives, the present invention provides an automated quantitative dust generation filter dust holding capacity test device, the technical solution of which includes a dust quantitative supply component, a dust pneumatic conveying component, a test air duct component, and a control component. The dust metering supply component includes a dust generating tray, a first servo motor, and a ball bearing set on the table. The surface of the dust generating tray is machined with several concentric circular grooves arranged radially. A waist-shaped groove is opened in the center of the dust generating tray. The output end of the first servo motor is provided with a waist-shaped protrusion that cooperates with the waist-shaped groove. The ball bearing contacts the lower surface of the dust generating tray to support the dust generating tray. The dust pneumatic conveying assembly includes a Venturi dust collection unit, a radial motion mechanism, and a second servo motor. The radial motion mechanism includes a moving platform and a linear transmission mechanism. The Venturi dust collection unit is located above the dust generating plate and fixed to the moving platform. The moving platform is connected to the linear transmission mechanism, and the linear transmission mechanism is connected to the output end of the second servo motor. The Venturi dust collection unit is provided with a dust inlet and an air supply end. The dust inlet is connected to the test air duct assembly. The test duct assembly includes a pre-filter, an upstream pipe, a test filter, a downstream pipe, a tail-end filter, a tail-end pipe, a flow meter, an electric valve, and a centrifugal fan connected in sequence. The control component is electrically connected to the first servo motor, the second servo motor, the flow meter, the electric valve, and the centrifugal fan, respectively, and is used to coordinate the actions of the above components.

[0005] In a preferred embodiment, the dust generating tray is a detachable structure, and the dust generating tray is detachably engaged with the waist-shaped protrusion of the first servo motor.

[0006] In a preferred embodiment, the Venturi suction unit is provided with a suction port, which is arranged facing the surface of the dust generating tray.

[0007] In a preferred embodiment, the concentric circular grooves have the same width and the same depth, and all the concentric circular grooves are evenly distributed radially along the dust generating disc.

[0008] In a preferred embodiment, the air supply end of the Venturi dust collection unit is connected to the compressed air pipeline via a solenoid valve, and the solenoid valve is electrically connected to the control component.

[0009] In a preferred embodiment, at least three ball bearings are provided, and all ball bearings are evenly distributed along the circumference of the dust generating disc.

[0010] In a preferred embodiment, the top of the upstream pipe is also provided with a dust-generating interface, which is connected to the dust inlet of the Venturi dust collection unit through the pipe.

[0011] In a preferred embodiment, the upstream pipe, downstream pipe and tail pipe are all provided with pressure taps distributed circumferentially. Each pressure tap is connected in parallel to a differential pressure sensor via an air pipe for pressure difference measurement. The differential pressure sensor is electrically connected to the control component.

[0012] In a preferred embodiment, the lower sides of the upstream pipe and the tail pipe are respectively equipped with disassembly and assembly mechanisms mounted on the test bench. The disassembly and assembly mechanisms include sliders driven by cylinders and supported by guide rails to realize the clamping and disassembly of the test filter and the tail filter.

[0013] The present invention also provides a method for using the above-mentioned device, the steps of which are as follows: Step 1: Select and install the appropriate dust generating plate according to the target dust volume and test air volume, and evenly fill each concentric groove with the predetermined mass of test dust; start the initial positioning program through the control component, so that the first servo motor drives the dust generating plate to rotate to the preset starting angle triggered by the initial positioning sensor. Step 2: Move the slider out of the upstream and tail pipes by the cylinder, clamp the test filter and tail filter respectively, and then reset and lock them; the control component starts the centrifugal fan and electric valve, and automatically adjusts the fan speed or valve opening according to the target air volume to establish a stable test airflow. Step 3: The control component activates the solenoid valve of the Venturi suction unit and connects the compressed air pipeline, adjusting the air supply pressure to generate a stable negative pressure; simultaneously, the first and second servo motors are activated, causing the dust-generating disc to rotate in a preset direction, while the suction port of the Venturi suction unit aligns with the innermost concentric groove; after each rotation of the dust-generating disc, the control component sends a step movement command to the second servo motor, causing the suction port to move radially outward to the next concentric groove; the control component adjusts the rotational angular velocity of the dust-generating disc in real time according to the current groove radius to maintain a constant dust generation speed; after each rotation of dust extraction, the rotation direction of the dust-generating disc is reversed to distribute the dust evenly; Step 4: The control component collects the differential pressure signal and airflow signal between the test filter and the tail filter in real time; when the differential pressure of the test filter reaches the preset resistance threshold, the solenoid valve of the Venturi dust collection unit and the first servo motor are automatically closed to stop dust generation; when the differential pressure of the tail filter exceeds the warning threshold, a maintenance prompt message is generated and the test can be paused. Step 5: Stop the centrifugal fan, remove the slider and disassemble the filter; clean the residual dust from the dust generating plate, replace or maintain the tail filter, reset the system, and prepare for the next test.

[0014] The beneficial effects of this invention are: The concentric groove design of the rotating dust-generating disc enables quantitative storage and sequential supply of dust. Combined with the negative pressure suction and radial movement mechanism of the Venturi dust collection unit, the accuracy and uniformity of dust delivery are ensured. The intelligent coordination of the control components enables the device to operate automatically, adapting to different airflow and dust volume requirements. At the same time, the pressure monitoring and airflow control mechanism of the test duct components improves the stability of the test. The usage method provides a complete operating procedure, applicable to various filter dust holding capacity test standards, improving testing efficiency and reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the device in this invention.

[0016] Figure 2 This is a top view of the dust generating tray in this invention.

[0017] In the diagram: 1. Dust metering supply component; 2. Dust pneumatic conveying component; 3. Test air duct component; 4. Control component; 11. Dust generating tray; 111. Concentric circular groove; 112. Waist-shaped groove; 12. First servo motor; 121. Waist-shaped protrusion; 13. Ball bearing support; 14. Tabletop; 21. Venturi dust collection unit; 211. Dust suction port; 212. Dust delivery port; 213. Air supply end; 22. Radial motion mechanism; 22 1. Mobile platform; 222. Linear transmission mechanism; 23. Second servo motor; 31. Pre-filter; 32. Upstream pipeline; 321. Dust generation interface; 322. Pressure tap; 33. Test filter; 34. Downstream pipeline; 35. Tail-end filter; 36. Tail-end pipeline; 37. Test bench; 371. Guide rail; 372. Slider; 373. Cylinder; 41. Flow meter; 42. Electric valve; 43. Centrifugal fan. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Example like Figure 1-2 The automated quantitative dust generation filter dust holding test device shown includes a dust quantitative supply component 1, a dust pneumatic conveying component 2, a test air duct component 3, and a control component 4; The dust metering supply component 1 includes a dust generating tray 11, a first servo motor 12, and a ball bearing 13, all mounted on a table 14. The dust generating tray 11 has several concentric circular grooves 111 arranged radially in sequence on its surface. A waist-shaped groove 112 is provided in the center of the dust generating tray 11. The output end of the first servo motor 12 is provided with a waist-shaped protrusion 121 that cooperates with the waist-shaped groove 112. The ball bearing 13 contacts the lower surface of the dust generating tray 11 to support the dust generating tray 11. The dust pneumatic conveying assembly 2 includes a Venturi dust collection unit 21, a radial motion mechanism 22, and a second servo motor 23. The radial motion mechanism 22 includes a moving platform 221 and a linear transmission mechanism 222. The Venturi dust collection unit 21 is located above the dust generating plate 11 and fixed to the moving platform 221. The moving platform 221 is connected to the linear transmission mechanism 222. The linear transmission mechanism 222 is connected to the output end of the second servo motor 23. The Venturi dust collection unit 21 is provided with a dust inlet 212 and an air supply end 213. The dust inlet 212 is connected to the test air duct assembly 3. The test air duct assembly 3 includes a pre-filter 31, an upstream pipe 32, a test filter 33, a downstream pipe 34, a tail filter 35, a tail pipe 36, a flow meter 41, an electric valve 42, and a centrifugal fan 43 connected in sequence. The control component 4 is electrically connected to the first servo motor 12, the second servo motor 23, the flow meter 41, the electric valve 42, and the centrifugal fan 43, respectively. It coordinates the actions of the above components, so that the dust generating disc 11 rotates and works in coordination with the radial positioning of the Venturi suction unit 21 to complete the dust suction and conveying cycle by cycle. When the preset conditions are met, the dust generating disc 11 automatically stops generating dust. After the dust generating disc 11 completes one revolution, it sends a step movement command to the second servo motor 23 according to the dust generating progress, so that the Venturi suction unit 21 switches to the radial position corresponding to the next concentric circular groove 111 in the action sequence. After the Venturi dust collection unit 21 completes the dust extraction of a certain concentric circular groove 111, the control component 4 causes the dust generating disc 11 to rotate in the opposite direction for the next revolution, so as to improve the uniformity of dust distribution and reduce unidirectional wear of the groove wall. The control component 4 controls the working air volume of the test air duct by adjusting the speed of the centrifugal fan 43 within a large air volume range, and reduces the effective ventilation area by adjusting the opening of the electric valve 42 within a small air volume range, so that the centrifugal fan 43 can operate within a speed range with stable output characteristics, thereby obtaining a stable test airflow within the full air volume range.

[0020] Furthermore, the flow meter 41 has a switchable range, and the control component 4 automatically selects or switches the appropriate range according to the target air volume to ensure the air volume measurement accuracy within different air volume ranges.

[0021] Furthermore, the Venturi structure of the Venturi suction unit 21 includes a compressed air inlet, a throat, and a diffuser section, which generates negative pressure using Bernoulli's principle; its suction port 211 is designed as a funnel-shaped opening with a diameter slightly smaller than the width of the groove.

[0022] Furthermore, the dust generating tray 11 is a detachable structure, and the dust generating tray 11 is detachably engaged with the waist-shaped protrusion 121 of the first servo motor 12.

[0023] Furthermore, the dust generating tray 11 can be replaced with dust generating trays 11 with different groove widths, groove depths, or groove numbers to adapt to quantitative dust generation requirements under different dust amounts and different test airflow conditions. During small airflow tests, the design parameters of the dust generating tray 11 can be selected as groove width 5mm, groove depth 3mm, and number of grooves 10. During large airflow tests, the design parameters of the dust generating tray 11 can be selected as groove width 10mm, groove depth 5mm, and number of grooves 20. The bottom of the groove is arc-shaped to reduce dust residue. The rotation axis of the dust generating tray 11 is equipped with an initial positioning sensor. Before the dust generation process begins, the control component 4 calibrates the dust generating tray 11 to a preset starting angle position according to the positioning signal. When replacing, the device is stopped first, the old tray is removed, the new tray is installed, and the initial position is calibrated through the control component 4 to ensure compatibility. The aforementioned initial positioning sensor can be a Hall sensor.

[0024] Furthermore, the radial movement step of the linear transmission mechanism 222 driven by the second servo motor 23 is consistent with the radial distance between adjacent concentric circular grooves 111, so that the Venturi dust collection unit 21 can accurately correspond to the position of the next concentric circular groove 111 in structure after each step movement; the control component 4 monitors the number of rotations of the dust generating disc through servo motor pulse counting, and sends a step command after each rotation is completed.

[0025] Furthermore, the linear transmission mechanism 222 employs a lead screw guide system, with position feedback provided by an encoder.

[0026] Furthermore, the Venturi dust collection unit 21 is provided with a dust collection port 211, which is arranged facing the surface of the dust generating plate 11. When aligned with the concentric circular groove 111, the negative pressure generated by the Venturi structure is used to draw dust from the groove and transport it to the upstream pipe 32 of the test air duct.

[0027] Furthermore, the concentric circular grooves 111 have the same width and the same depth to form a fixed dust storage volume. All the concentric circular grooves 111 are evenly distributed radially along the dust generating disk 11. The control component 4 automatically adjusts the rotational angular velocity of the dust generating disk 11 according to the set dust generating speed and the radial position of each concentric circular groove 111, so that the dust generating speed remains basically constant under different groove radius conditions.

[0028] Furthermore, the air supply end 213 of the Venturi dust collection unit 21 is connected to the compressed air pipeline through a solenoid valve. The solenoid valve is electrically connected to the control component 4. The solenoid valve is a proportional valve to avoid insufficient suction at low air volume or excessive disturbance at high air volume.

[0029] Furthermore, at least three ball bearings 13 are provided, and all ball bearings 13 are evenly distributed along the circumference of the dust generating disc 11.

[0030] Furthermore, the top of the upstream pipe 32 is also provided with a dust emission interface 321, which is connected to the dust delivery port 212 of the Venturi dust collection unit 21 through the pipe.

[0031] Furthermore, the upstream pipe 32, downstream pipe 34 and tail pipe 36 are all provided with pressure taps 322 distributed circumferentially. Each pressure tap 322 is connected in parallel to a differential pressure sensor via an air pipe for pressure difference measurement. The differential pressure sensor is electrically connected to the control component 4. When the differential pressure of the tail filter 35 exceeds the preset warning threshold, a maintenance prompt message is generated to avoid increased energy consumption and airflow fluctuations caused by increased resistance of the tail filter 35. It also prevents dust from entering the downstream flow meter 41 and centrifugal fan 43 when the filter 33 is damaged.

[0032] Furthermore, the lower sides of the upstream pipe 32 and the tail pipe 36 are respectively equipped with disassembly and assembly mechanisms mounted on the test bench 37. The disassembly and assembly mechanisms include a slider 372 driven by a cylinder 373 and supported by a guide rail 371, so as to realize the clamping and disassembly of the test filter 33 and the tail filter 35.

[0033] Furthermore, the flow meter 41 is a thermal gas mass flow meter, and the control component 4 can be a PLC or an embedded microcontroller equipped with a touch screen interface for parameter setting and real-time monitoring. It can also automatically switch relay circuits and select the appropriate measurement channel according to the target air volume. Before the dust generation process starts, the user inputs test parameters (such as air volume and dust generation speed) through the interface, and the control component 4 automatically calculates and executes the action sequence.

[0034] The method of using the above-mentioned device includes the following steps: Step 1: Select and install the appropriate dust generating plate 11 according to the target dust volume and test air volume, and fill the predetermined mass of test dust evenly into each concentric circular groove 111; start the initial positioning program through the control component 4, so that the first servo motor 12 drives the dust generating plate 11 to rotate to the preset starting angle triggered by the initial positioning sensor. Step 2: Drive the slider 372 through the cylinder 373 to move out of the upstream pipe 32 and the tail pipe 36, clamp the test filter 33 and the tail filter 35 respectively, and then reset and lock them; the control component 4 starts the centrifugal fan 43 and the electric valve 42, and automatically adjusts the fan speed or valve opening according to the target air volume to establish a stable test airflow. Step 3: Control component 4 activates the solenoid valve of Venturi suction unit 21 and connects the compressed air pipeline, adjusting the air supply pressure to generate a stable negative pressure; simultaneously, the first servo motor 12 and the second servo motor 23 are activated, causing the dust-generating disc 11 to rotate in a preset direction, while the suction port of Venturi suction unit 21 is aligned with the innermost concentric groove 111; after each rotation of dust-generating disc 11, control component 4 sends a step movement command to the second servo motor 23, causing the suction port to move radially outward to the next concentric groove 111; control component adjusts the rotational angular velocity of dust-generating disc 11 in real time according to the current groove radius to maintain a constant dust generation speed; after each rotation of dust suction, the rotation direction of dust-generating disc 11 is reversed to distribute dust evenly; Step 4: Control component 4 collects the differential pressure signal and airflow signal between test filter 33 and tail filter 35 in real time; when the differential pressure of test filter 33 reaches the preset resistance threshold, the solenoid valve of Venturi dust collection unit 21 and the first servo motor 12 are automatically closed to stop dust generation; when the differential pressure of tail filter 35 exceeds the warning threshold, maintenance prompt information is generated and the test can be paused. Step 5: Stop the centrifugal fan 43, remove the slider 372 and disassemble the filter; clean the residual dust from the dust generating plate 11, replace or maintain the tail filter 35, and reset the system to prepare for the next test.

Claims

1. An automated quantitative dust generation filter dust holding capacity test device, characterized in that, It includes a dust metering supply component (1), a dust pneumatic conveying component (2), a test air duct component (3), and a control component (4). The dust metering supply component (1) includes a dust generating tray (11), a first servo motor (12), and a ball bearing (13) set on a table (14). The dust generating tray (11) has several concentric circular grooves (111) arranged radially in sequence on its surface. A waist-shaped groove (112) is opened in the center of the dust generating tray (11). The output end of the first servo motor (12) is provided with a waist-shaped protrusion (121) that cooperates with the waist-shaped groove (112). The ball bearing (13) contacts the lower surface of the dust generating tray (11) to support the dust generating tray (11). The dust pneumatic conveying assembly (2) includes a Venturi dust collection unit (21), a radial motion mechanism (22), and a second servo motor (23). The radial motion mechanism (22) includes a moving platform (221) and a linear transmission mechanism (222). The Venturi dust collection unit (21) is located above the dust generating plate (11) and fixed to the moving platform (221). The moving platform (221) is connected to the linear transmission mechanism (222), and the linear transmission mechanism (222) is connected to the output end of the second servo motor (23). The Venturi dust collection unit (21) is provided with a dust inlet (212) and an air supply end (213). The dust inlet (212) is connected to the test air duct assembly (3). The test air duct assembly (3) includes a pre-filter (31), an upstream pipe (32), a test filter (33), a downstream pipe (34), a tail filter (35), a tail pipe (36), a flow meter (41), an electric valve (42), and a centrifugal fan (43) connected in sequence. The control component (4) is electrically connected to the first servo motor (12), the second servo motor (23), the flow meter (41), the electric valve (42), and the centrifugal fan (43) respectively, and is used to coordinate the operation of the above components.

2. The automated quantitative dust generation filter dust holding capacity test device according to claim 1, characterized in that, The dust generating plate (11) is a detachable structure, and the dust generating plate (11) is detachably engaged with the waist-shaped protrusion (121) of the first servo motor (12).

3. The automated quantitative dust generation filter dust holding capacity test device according to claim 1, characterized in that, The Venturi suction unit (21) is provided with a suction port (211), which is arranged facing the surface of the dust generating plate (11).

4. The automated quantitative dust generation filter dust holding capacity test device according to claim 1, characterized in that, The concentric circular grooves (111) have the same width and the same depth, and all the concentric circular grooves (111) are evenly distributed radially along the dust generating plate (11).

5. The automated quantitative dust generation filter dust holding capacity test device according to claim 1, characterized in that, The air supply end (213) of the Venturi vacuum unit (21) is connected to the compressed air pipeline through a solenoid valve, and the solenoid valve is electrically connected to the control component (4).

6. The automated quantitative dust generation filter dust holding capacity test device according to claim 1, characterized in that, At least three ball bearings (13) are provided, and all ball bearings (13) are evenly distributed along the circumference of the dust generating disc (11).

7. The automated quantitative dust generation filter dust holding capacity test device according to claim 1, characterized in that, The top of the upstream pipe (32) is also provided with a dust-generating interface (321), which is connected to the dust inlet (212) of the Venturi dust collection unit (21) through the pipe.

8. The automated quantitative dust generation filter dust holding capacity test device according to claim 1, characterized in that, The upstream pipe (32), downstream pipe (34) and tail pipe (36) are all provided with pressure taps (322) distributed in the circumferential direction. Each pressure tap (322) is connected in parallel to a differential pressure sensor through an air pipe for pressure difference measurement. The differential pressure sensor is electrically connected to the control component (4).

9. The automated quantitative dust generation filter dust holding capacity test device according to claim 1, characterized in that, The lower sides of the upstream pipe (32) and the tail pipe (36) are respectively equipped with disassembly and assembly mechanisms set on the test bench (37). The disassembly and assembly mechanisms include a slider (372) driven by a cylinder (373) and supported by a guide rail (371) to realize the clamping and disassembly of the test filter (33) and the tail filter (35).

10. The method of using the automated quantitative dust generation filter dust holding capacity test device according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Select and install a suitable dust generating plate (11) according to the target dust volume and test air volume, and fill the predetermined mass of test dust evenly into each concentric circular groove (111); start the initial positioning program through the control component (4) so ​​that the first servo motor (12) drives the dust generating plate (11) to rotate to the preset starting angle triggered by the initial positioning sensor. Step 2: Drive the slider (372) with cylinder (373) to move out of the upstream pipe (32) and the tail pipe (36), clamp the test filter (33) and the tail filter (35) respectively, and then reset and lock them; the control component (4) starts the centrifugal fan (43) and the electric valve (42), and automatically adjusts the fan speed or valve opening according to the target air volume to establish a stable test airflow; Step 3: The control component (4) starts the solenoid valve of the Venturi suction unit (21) and connects the compressed air pipeline, and adjusts the air supply pressure to generate a stable negative pressure; the first servo motor (12) and the second servo motor (23) are started simultaneously to make the dust generating plate (11) rotate in the preset direction, and at the same time the dust suction port of the Venturi suction unit (21) is aligned with the innermost concentric groove (111); after the dust generating plate (11) completes one rotation, the control component (4) sends a step movement command to the second servo motor (23) to make the dust suction port move radially outward to the next concentric groove (111); the control component adjusts the rotational angular velocity of the dust generating plate (11) in real time according to the current groove radius to maintain a constant dust generation speed; after each dust suction cycle is completed, the rotation direction of the dust generating plate (11) is reversed to distribute the dust evenly. Step 4: The control component (4) collects the differential pressure signal and airflow signal between the test filter (33) and the tail filter (35) in real time; when the differential pressure of the test filter (33) reaches the preset resistance threshold, the solenoid valve of the Venturi dust collection unit (21) and the first servo motor (12) are automatically closed to stop dust generation; when the differential pressure of the tail filter (35) exceeds the warning threshold, maintenance prompt information is generated and the test can be paused. Step 5: Stop the centrifugal fan (43), remove the slider (372) and disassemble the filter; clean the dust from the dust generator (11), replace or maintain the tail filter (35), reset the system, and prepare for the next test.

Images