Dry-type air tightness detection device for automobile filter and detection method thereof

Abstract

This invention relates to the field of airtightness testing devices, specifically a dry airtightness testing device and method for automotive filters. The invention involves placing the filter above a loading base plate, then a controller drives a motor to rotate a double-headed reverse-threaded rotating rod, causing the two side limit clamps to slide inwards synchronously to clamp and position the filter. After the filter is tested, the magnetic pressing assembly resets. The controller then controls an electrically controlled magnet to generate a repulsive force, pushing the loading base plate to rotate and stretching the limit spring, forming an inclined slope that allows the filter to automatically slide down. After the magnet is de-energized, the spring drives the base plate to reset. The controller drives an electrically controlled cylinder to move the pressing seat downwards, causing the limit sleeve and limit cylinder to press down and seal the filter. An electrically controlled strong magnet generates magnetism, pushing the pressing slider downwards, causing it to slide along the limit post and stretch the positioning spring. The magnetic repulsive force forces the pressing slider down to fix the filter, making it compatible with various types of filters.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air tightness detection device, in particular to a dry type air tightness detection device for automobile filter and detection method thereof. BACKGROUND

[0002] The dry type air tightness detection device for automobile filter belongs to filter sealing performance detection equipment for factory, which is different from the water immersion bubble leak detection process. The dry type gas detection method is used throughout the process. The filter to be detected is clamped and plugged by a sealing tool. Dry compressed gas is introduced into the inner cavity of the filter housing. After pressure stabilization, the gas source is cut off. The pressure change data of the gas is collected by the pressure / differential pressure sensor. The leakage of the shell sealing, cover plate welding and threaded connection is quantitatively evaluated to complete the air tightness determination. During the use of the existing dry type air tightness detection device for automobile filter, due to the large number of automobile filter models, different fixed structures need to be replaced when carrying out air tightness detection on different models of filters, which has the problem of high replacement cost. At the same time, most of the dry type air tightness detection devices use manual feeding and discharging mode, which is difficult to seamlessly connect with the production line. If a multi-station rotary table structure is used, the equipment cost will be greatly increased. In addition, positioning needs to be completed before filter detection, so that the filter is directly above the detection station. The existing positioning structure relies on multiple electrical components, which has the defect of high equipment energy consumption.

[0003] Therefore, a dry type air tightness detection device for automobile filter and detection method thereof are needed to improve the above problems. SUMMARY

[0004] In order to solve the problem that the dry type air tightness detection device for automobile filter needs to replace different fixed structures when detecting different models of filters, which has high replacement cost, the present application provides a dry type air tightness detection device for automobile filter and detection method thereof to solve the above problems.

[0005] To achieve the above purpose, the present application provides the following technical scheme: A dry type air tightness detection device for automobile filter, comprising a device support, a mounting plate is fixedly installed on the outer wall of the device support, a controller is inlaidly installed on the outer wall of the mounting plate, an emergency stop switch is inlaid on the outer wall of the mounting plate below the controller, and a fixing seat is arranged on the inner wall of the device support. The outer wall of the fixed seat is provided with a material limiting assembly for positioning and discharging the filter, the corner of the fixed seat is fixedly installed with an installation column, the top outer wall of the installation column is fixedly installed with an installation top plate, the outer wall of the installation top plate is provided with an air tightness detector, the outer wall of the installation top plate is embedded with an electric control air cylinder, the outer wall of the installation column is slidably connected with a limiting sleeve, the outer wall of the limiting sleeve is fixedly installed with a pressing seat, the limiting sleeve is provided with a plurality of groups and is located at the corner of the pressing seat, and the outer wall of the pressing seat is fixedly installed with a connecting piece, one end of the connecting piece is fixedly connected with the moving end of the electric control air cylinder. The bottom outer wall of the pressing seat is provided with a magnetic pressing assembly for limiting and fixing the filter.

[0006] As a preferred scheme of the application, the material limiting assembly comprises a discharging shell and a limiting shell, the discharging shell is embedded on the outer wall of the fixed seat, and the discharging shell is located directly below the installation top plate, the outer wall of the discharging shell is provided with an installation groove, the inner wall of the installation groove is embedded with an air tightness detection joint, the inner wall of the installation groove is rotatably connected with a rotating rod, and the outer wall of the rotating rod is rotatably connected with a feeding bottom plate.

[0007] As a preferred scheme of the application, the rotating rod is arrayed with limiting springs on one side and on the inner wall of the installation groove, wherein one end of the limiting spring is fixedly connected with the feeding bottom plate, and a support is annularly arranged below the feeding bottom plate and on the inner wall of the installation groove.

[0008] As a preferred scheme of the application, the support is fixedly installed with an electric control magnet on one side and on the inner wall of the installation groove, the limiting shell is fixedly installed on the side wall of the fixed seat, the opposite inner walls of the limiting shell are rotatably connected with a double-head reverse thread rotating rod, and one end of the double-head reverse thread rotating rod penetrates through the limiting shell and extends to the outer wall of the limiting shell and is fixedly installed with a driving motor.

[0009] As a preferred scheme of the application, the driving motor is fixedly installed on the outer wall of the limiting shell, the opposite outer walls of the double-head reverse thread rotating rod are respectively provided with limiting clamps, the connecting mode of the limiting clamps and the double-head reverse thread rotating rod is screw connection, and the side wall of the limiting shell is provided with a limiting sliding groove, wherein the limiting clamps are slidably connected on the inner wall of the limiting sliding groove, and the limiting clamps are located on one side of the feeding bottom plate.

[0010] As the preferred scheme of the present application, the magnetic pressing assembly comprises a limiting cylinder fixedly installed on the bottom outer wall of the pressing seat, a limiting post fixedly installed on the inner wall of the limiting cylinder, a pressing sliding block slidingly connected to the outer wall of the limiting post, and a positioning spring fixedly installed on the top outer wall of the pressing sliding block, wherein one end of the positioning spring is fixedly connected to the inner wall of the limiting cylinder, and an electrically controlled strong magnet is inlaidly installed on one side of the positioning spring and located on the inner wall of the limiting cylinder, wherein the electrically controlled strong magnet magnetically limits the pressing sliding block.

[0011] As the preferred scheme of the present application, one end of the air tightness detection connector is connected with an air tightness detector, and the support supports the bottom of the feeding bottom plate, wherein the electrically controlled magnet generates magnetism to magnetically repel the feeding bottom plate.

[0012] As the preferred scheme of the present application, the limiting sleeve is provided with multiple groups and is located at the corners of the pressing seat, the opposite outer walls of the equipment support are respectively provided with starting switches, and the bottom corners of the equipment support are respectively fixedly installed with universal wheels.

[0013] As the preferred scheme of the present application, the controller is respectively connected with an emergency stop switch, an air tightness detector, an electrically controlled cylinder, a starting switch, an electrically controlled strong magnet, an electrically controlled magnet and a driving motor through wires in an electrical connection manner.

[0014] A detection method of a dry air tightness detection device of an automobile filter is provided, and the steps are as follows: Operation step one: the controller controls the air tightness detector and the electrically controlled cylinder to operate, the filter is placed above the feeding bottom plate, and then the controller controls the driving motor to operate, so that the driving shaft of the driving motor drives the double-head reverse thread rotating rod to operate, and then the double-head reverse thread rotating rod drives the limiting clamping blocks on both sides through thread connection; Operation step two: the limiting clamping blocks on both sides slide inward on the inner walls of the limiting sliding grooves, so that the limiting clamping blocks on both sides simultaneously push the filter inward for positioning, so that the bottom end of the filter is located on the plugging jig of the air tightness detection connector, and the subsequent dry air tightness detection is facilitated; Operation step three: the controller controls the electrically controlled cylinder to operate, so that the moving end of the electrically controlled cylinder pushes the pressing seat through the connecting piece, so that the pressing seat drives the limiting sleeve to longitudinally slide on the outer wall of the mounting column, so that the pressing seat drives the limiting cylinder to move downward, so that the limiting cylinder seals the filter, and then the controller controls the electrically controlled strong magnet to generate magnetism, so that the electrically controlled strong magnet magnetically limits the pressing sliding block. Step 4: This causes the lower slider to slide downwards on the outer wall of the limiting post. At the same time, the lower slider stretches the positioning spring to facilitate elastic reset after the test is completed. This causes the lower slider to be subjected to the strong magnetic repulsion of the electrically controlled strong magnet, which causes the lower slider to press down and fix the filter. Operation Step 5: After the filter is fixed, the controller will control the air tightness tester to operate, so that the air tightness tester can perform a dry air tightness test on the filter. At the same time, the air tightness tester generates an electrical signal, which is transmitted to the controller through the wire, so that the controller can display the test data in real time. Operation Step Six: After the filter test is completed, the magnetic pressing component will be reset. Then, the controller will control the electric magnet to generate magnetism, which will magnetically repel the feeding base plate, causing the feeding base plate to rotate on the outer wall of the rotating rod. At the same time, the feeding base plate will drive the limit spring to extend. Operating Step Seven: Then rotate the feeding base plate to create an inclined slope between the surface of the feeding base plate and the surface of the unloading shell, so that the filter on the surface of the feeding base plate slides outward for unloading. Subsequently, the electric control magnet is de-energized and loses its magnetism, and the stretched limit spring elastically resets.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention enables the positioning of the filter to be tested by setting a material limiting component in the dry airtightness testing device and its testing method for automotive filters. The controller controls the airtightness tester and the electric cylinder to work. After the filter is placed above the loading base plate, the controller drives the motor to drive the double-headed reverse thread rotating rod to rotate, which drives the limiting clamps on both sides to slide inward synchronously to clamp and position the filter, so that the bottom of the filter falls onto the sealing fixture, completing the station positioning, reducing the electrical components required for positioning and reducing equipment energy consumption.

[0016] 2. This invention enables the unloading of filters after testing by setting a material limiting component in the dry airtightness testing device and method for automotive filters. After the filter test is completed, the magnetic pressing component is reset, and the controller controls the electric magnet to generate a repulsive force, which pushes the loading base plate to rotate and stretches the limiting spring, forming an inclined slope so that the filter can automatically slide down for unloading. After the magnet is de-energized, the spring drives the base plate to reset. This eliminates the need for manual unloading and expensive multi-station turntables, making it easy to connect to production lines.

[0017] 3. This invention enables the filter to be limited and fixed by setting a magnetic pressing component in the dry airtightness testing device and method for automotive filters. The controller drives the electric cylinder to push the pressing seat down, which in turn drives the limiting sleeve and the limiting cylinder to press down and seal the filter. The electric strong magnet is energized to generate magnetism and push the pressing slider down, so that it slides along the limiting post and stretches the positioning spring. The magnetic repulsion force makes the pressing slider press down and fix the filter. It can be adapted to various filters, eliminating the need for frequent replacement of the fixing structure and reducing the cost of replacement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the mounting top plate structure of the present invention; Figure 3 This is a schematic diagram of the magnetic pressing component structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A; Figure 5 This is a schematic diagram of the limiting cylinder structure of the present invention; Figure 6 This is a schematic diagram of the material limiting component structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point B; Figure 8 For the present invention Figure 6 A magnified schematic diagram of the structure at point C.

[0019] In the diagram: 1. Equipment bracket; 2. Mounting plate; 3. Controller; 4. Emergency stop switch; 5. Fixed base; 6. Material limit assembly; 601. Discharge housing; 602. Limiting housing; 603. Mounting groove; 604. Air tightness test connector; 605. Rotating rod; 606. Feeding base plate; 607. Limiting spring; 608. Support column; 609. Electromagnet; 610. Double-ended reverse thread rotating rod; 611. Drive motor 612. Limiting clamp; 613. Limiting slide; 7. Mounting column; 8. Mounting top plate; 9. Air tightness tester; 10. Electric cylinder; 11. Limiting sleeve; 12. Pressing seat; 13. Connecting piece; 14. Magnetic pressing assembly; 1401. Limiting cylinder; 1402. Limiting column; 1403. Pressing slider; 1404. Positioning spring; 1405. Electric strong magnet; 15. Start switch; 16. Caster wheel. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Example: Please refer to Figures 1-8 The device shown is a dry air tightness testing device for an automotive filter, including a device bracket 1, an mounting plate 2 fixedly installed on the outer wall of the device bracket 1, a controller 3 embedded in the outer wall of the mounting plate 2, an emergency stop switch 4 embedded directly below the controller 3 and on the outer wall of the mounting plate 2, and a fixing seat 5 provided on the inner wall of the device bracket 1. The outer wall of the fixed base 5 is provided with a material limiting component 6 for positioning and feeding the filter. A mounting column 7 is fixedly installed at the corner of the fixed base 5. A mounting top plate 8 is fixedly installed on the top outer wall of the mounting column 7. An air tightness tester 9 is provided on the outer wall of the mounting top plate 8. An electric control cylinder 10 is embedded in the outer wall of the mounting top plate 8. A limiting sleeve 11 is slidably connected to the outer wall of the mounting column 7. A lower pressure seat 12 is fixedly installed on the outer wall of the limiting sleeve 11. Multiple sets of limiting sleeves 11 are provided and are located at the corners of the lower pressure seat 12. A connector 13 is fixedly installed on the outer wall of the lower pressure seat 12. One end of the connector 13 is fixedly connected to the moving end of the electric control cylinder 10. The bottom outer wall of the pressure seat 12 is provided with a magnetic pressure assembly 14 for limiting and fixing the filter.

[0022] In this embodiment, specific references Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8 The material limiting component 6 includes a feeding housing 601 and a limiting housing 602. The feeding housing 601 is embedded in the outer wall of the fixed base 5 and is located directly below the mounting top plate 8. An installation groove 603 is provided on the outer wall of the feeding housing 601. An airtightness test connector 604 is embedded in the inner wall of the installation groove 603. A rotating rod 605 is rotatably connected to the inner wall of the installation groove 603. An feeding base plate 606 is rotatably connected to the outer wall of the rotating rod 605. Limiting springs 607 are arranged in an array on one side of the rotating rod 605 and on the inner wall of the installation groove 603. One end of the limiting spring 607 is fixedly connected to the feeding base plate 606. A support column 608 is arranged in a ring directly below the feeding base plate 606 and on the inner wall of the installation groove 603.

[0023] In this embodiment, specific references Figure 1 ,Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8 An electrically controlled magnet 609 is fixedly installed on one side of the support column 608 and on the inner wall of the mounting groove 603. The limiting housing 602 is fixedly installed on the side wall of the fixing seat 5. A double-headed reverse thread rotating rod 610 is rotatably connected to the opposite inner wall of the limiting housing 602. One end of the double-headed reverse thread rotating rod 610 passes through the limiting housing 602 and extends to the outer wall of the limiting housing 602, where a drive motor 611 is fixedly installed. The drive motor 611 is fixedly installed on the outer wall of the limiting housing 602. Limiting clamps 612 are respectively provided on the opposite outer walls of the double-headed reverse thread rotating rod 610. The limiting clamps 612 and the double-headed reverse thread rotating rod 610 are connected by a threaded connection. A limiting groove 613 is opened on the side wall of the limiting housing 602, wherein the limiting clamps 612 are slidably connected to the inner wall of the limiting groove 613, and the limiting clamps 612 are located on one side of the feeding base plate 606.

[0024] In this embodiment, specific references Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The magnetic pressing assembly 14 includes a limiting cylinder 1401, which is fixedly installed on the bottom outer wall of the pressing base 12. A limiting post 1402 is fixedly installed on the inner wall of the limiting cylinder 1401. A pressing slider 1403 is slidably connected to the outer wall of the limiting post 1402. A positioning spring 1404 is fixedly installed on the top outer wall of the pressing slider 1403. One end of the positioning spring 1404 is fixedly connected to the inner wall of the limiting cylinder 1401. An electrically controlled strong magnet 1405 is embedded on one side of the positioning spring 1404 and on the inner wall of the limiting cylinder 1401. The electrically controlled strong magnet 1405 magnetically limits the pressing slider 1403.

[0025] Among them, one end of the airtightness testing connector 604 is connected to the airtightness tester 9, the support column 608 supports the bottom of the feeding base plate 606, and the electric magnet 609 generates magnetism when energized to magnetically repel the feeding base plate 606.

[0026] Among them, there are multiple sets of limit sleeves 11, which are located at the corners of the lower pressure seat 12. The outer walls of the equipment bracket 1 are respectively equipped with start switches 15, and the bottom corners of the equipment bracket 1 are respectively fixedly installed with casters 16.

[0027] Based on the above structural features and connection relationships, the electrically controlled strong magnet 1405 magnetically limits the downward sliding block 1403, thereby causing the downward sliding block 1403 to slide downward on the outer wall of the limiting post 1402. At the same time, the downward sliding block 1403 stretches the positioning spring 1404 to facilitate reset after the test is completed. The surface of the loading base plate 606 and the surface of the unloading housing 601 are inclined, so that the filter on the surface of the loading base plate 606 slides outward for unloading. Then, the electrically controlled magnet 609 is de-energized and loses its magnetism, and the stretched limiting spring 607 elastically resets. When the downward sliding block 1403 presses the filter downward to fix it, the filter presses down on the loading base plate 606, thereby causing the support column 608 to support and limit the loading base plate 606. The controller 3 is electrically connected to the emergency stop switch 4, the air tightness tester 9, the electric cylinder 10, the start switch 15, the electric strong magnet 1405, the electric magnet 609, and the drive motor 611 via wires. This connection enables the device to be powered on, thereby allowing the controller 3 to control the operation of the emergency stop switch 4, the air tightness tester 9, the electric cylinder 10, the start switch 15, the electric strong magnet 1405, the electric magnet 609, and the drive motor 611.

[0028] In this solution, the dry airtightness testing device and method for automotive filters, when in operation, involves turning on the switch of controller 3 to preset parameters, thereby causing controller 3 to control the airtightness tester 9 and the electronically controlled cylinder 10 to operate, placing the filter directly above the loading base plate 606. Subsequently, controller 3 will control the drive motor 611 to operate, causing the drive shaft of drive motor 611 to drive the double-headed reverse thread rotating rod 610 to operate, thereby causing the double-headed reverse thread rotating rod 610 to pass through threaded connections respectively... The limiting clamps 612 on both sides are driven to slide inward on the inner wall of the limiting slide groove 613, thereby pushing the filter inward simultaneously to position it so that the bottom end of the filter is on the sealing fixture of the airtightness test connector 604, which facilitates subsequent dry airtightness testing. This solves the problem that the existing positioning structure relies on multiple electrical components and has the drawback of high equipment energy consumption, which requires positioning the filter before testing so that it is directly above the testing station. The controller 3 controls the operation of the electronically controlled cylinder 10, causing its moving end to push the lower pressure seat 12 via the connecting piece 13. This causes the lower pressure seat 12 to drive the limiting sleeve 11 to slide longitudinally on the outer wall of the mounting column 7, thus causing the lower pressure seat 12 to drive the limiting sleeve 1401 downwards. This seals the filter with the limiting sleeve 1401. Subsequently, the controller 3 energizes the electronically controlled strong magnet 1405 to generate magnetism, magnetically limiting the lower pressure slider 1403. The downward sliding block 1403 slides downward on the outer wall of the limiting post 1402. At the same time, the downward sliding block 1403 stretches the positioning spring 1404 to facilitate elastic reset after the test is completed. This causes the downward sliding block 1403 to be subjected to the strong magnetic repulsion of the electrically controlled strong magnet 1405, which causes the downward sliding block 1403 to press down and fix the filter. This solves the problem that there are many models of automotive filters, and when conducting air tightness tests on different models of filters, it is necessary to change the corresponding fixing structure, which results in high replacement costs. After the filter is fixed, the controller 3 will control the air tightness tester 9 to operate, so that the air tightness tester 9 can perform dry air tightness testing on the filter. At the same time, the air tightness tester 9 generates an electrical signal, which is transmitted to the controller 3 through the wire, so that the controller 3 can display the test data in real time. After the filter inspection is completed, the magnetic pressing component 14 is reset. Then, the controller 3 controls the electric magnet 609 to generate magnetism, which in turn magnetically repels the loading base plate 606, causing the loading base plate 606 to rotate on the outer wall of the rotating rod 605. At the same time, the loading base plate 606 drives the limit spring 607 to extend, which in turn causes the loading base plate 606 to rotate, creating an inclined slope between the surface of the loading base plate 606 and the surface of the unloading housing 601. This allows the filter on the surface of the loading base plate 606 to slide outward for unloading. Afterward, the electric magnet 609 is de-energized and loses its magnetism, and the stretched limit spring 607 elastically resets. This solves the problem that manual loading and unloading methods are difficult to seamlessly integrate with production lines, and that using a multi-station turntable structure would cause a significant increase in equipment costs.

[0029] The emergency stop switch 4, air tightness tester 9, electrically controlled cylinder 10, start switch 15, electrically controlled strong magnet 1405, electrically controlled magnet 609, drive motor 611 and controller 3 used in this invention are all existing known electrical devices, and all can be purchased and used directly on the market. Their structure, circuit and control principle are all existing known technologies. Therefore, the structure, circuit and control principle of the emergency stop switch 4, air tightness tester 9, electrically controlled cylinder 10, start switch 15, electrically controlled strong magnet 1405, electrically controlled magnet 609, drive motor 611 and controller 3 will not be described in detail here.

[0030] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dry airtightness testing device for automotive filters, comprising a device bracket (1), characterized in that: An installation plate (2) is fixedly installed on the outer wall of the equipment bracket (1). A controller (3) is embedded in the outer wall of the installation plate (2). An emergency stop switch (4) is embedded directly below the controller (3) and on the outer wall of the installation plate (2). A fixing seat (5) is provided on the inner wall of the equipment bracket (1). The outer wall of the fixed base (5) is provided with a material limiting component (6) for positioning and feeding the filter. A mounting column (7) is fixedly installed at the corner of the fixed base (5). A mounting top plate (8) is fixedly installed on the top outer wall of the mounting column (7). An air tightness tester (9) is provided on the outer wall of the mounting top plate (8). An electric control cylinder (10) is embedded in the outer wall of the mounting top plate (8). A limiting sleeve (11) is slidably connected on the outer wall of the mounting column (7). A lower pressure seat (12) is fixedly installed on the outer wall of the limiting sleeve (11). Multiple sets of limiting sleeves (11) are provided and are located at the corners of the lower pressure seat (12). A connector (13) is fixedly installed on the outer wall of the lower pressure seat (12). One end of the connector (13) is fixedly connected to the moving end of the electric control cylinder (10). The bottom outer wall of the pressure seat (12) is provided with a magnetic pressure assembly (14) for limiting and fixing the filter.

2. The dry airtightness testing device for an automotive filter according to claim 1, characterized in that: The material limiting component (6) includes a feeding shell (601) and a limiting shell (602). The feeding shell (601) is embedded in the outer wall of the fixed base (5) and is located directly below the mounting top plate (8). An installation groove (603) is provided on the outer wall of the feeding shell (601). An airtightness test connector (604) is embedded in the inner wall of the installation groove (603). A rotating rod (605) is rotatably connected to the inner wall of the installation groove (603). A feeding base plate (606) is rotatably connected to the outer wall of the rotating rod (605).

3. The dry airtightness testing device for an automotive filter according to claim 2, characterized in that: Limiting springs (607) are arranged in an array on one side of the rotating rod (605) and on the inner wall of the mounting groove (603). One end of the limiting spring (607) is fixedly connected to the feeding base plate (606). A support column (608) is arranged in a ring on the inner wall of the mounting groove (603) directly below the feeding base plate (606).

4. The dry airtightness testing device for an automotive filter according to claim 3, characterized in that: An electrically controlled magnet (609) is fixedly installed on one side of the support column (608) and on the inner wall of the mounting groove (603). The limiting housing (602) is fixedly installed on the side wall of the fixing seat (5). A double-headed reverse thread rotating rod (610) is rotatably connected to the inner wall opposite to the limiting housing (602). One end of the double-headed reverse thread rotating rod (610) passes through the limiting housing (602) and extends to the outer wall of the limiting housing (602), where a drive motor (611) is fixedly installed.

5. The dry airtightness testing device for an automotive filter according to claim 4, characterized in that: The drive motor (611) is fixedly installed on the outer wall of the limiting housing (602). The double-headed reverse thread rotating rod (610) is provided with limiting clamps (612) on its opposite outer wall. The limiting clamps (612) and the double-headed reverse thread rotating rod (610) are connected by a threaded connection. The side wall of the limiting housing (602) is provided with a limiting groove (613). The limiting clamps (612) are slidably connected to the inner wall of the limiting groove (613), and the limiting clamps (612) are located on one side of the loading base plate (606).

6. The dry airtightness testing device for an automotive filter according to claim 5, characterized in that: The magnetic pressing assembly (14) includes a limiting cylinder (1401), which is fixedly installed on the bottom outer wall of the pressing base (12). A limiting post (1402) is fixedly installed on the inner wall of the limiting cylinder (1401). A pressing slider (1403) is slidably connected to the outer wall of the limiting post (1402). A positioning spring (1404) is fixedly installed on the top outer wall of the pressing slider (1403). One end of the positioning spring (1404) is fixedly connected to the inner wall of the limiting cylinder (1401). An electrically controlled strong magnet (1405) is embedded on one side of the positioning spring (1404) and on the inner wall of the limiting cylinder (1401). The electrically controlled strong magnet (1405) magnetically limits the pressing slider (1403).

7. The dry airtightness testing device for an automotive filter according to claim 5, characterized in that: One end of the airtightness testing connector (604) is connected to an airtightness tester (9), the support column (608) supports the bottom of the feeding base plate (606), and the electric magnet (609) generates magnetism when energized to magnetically repel the feeding base plate (606).

8. The dry airtightness testing device for an automotive filter according to claim 1, characterized in that: The limiting sleeve (11) is provided in multiple sets and is located at the corner of the lower pressure seat (12). The outer walls of the equipment bracket (1) are respectively provided with start switches (15). The bottom corners of the equipment bracket (1) are respectively fixedly installed with casters (16).

9. A dry airtightness testing device for an automotive filter according to claim 6, characterized in that: The controller (3) is connected to an emergency stop switch (4), an airtightness tester (9), an electric cylinder (10), a start switch (15), an electric strong magnet (1405), an electric magnet (609), and a drive motor (611) via wires, and the connection method is electrical connection.

10. The testing method of the dry airtightness testing device for an automotive filter according to any one of claims 1-9, wherein the specific steps are as follows: Operation Step 1: The controller (3) controls the air tightness tester (9) and the electric cylinder (10) to operate, placing the filter directly above the loading base plate (606). Then, the controller (3) controls the drive motor (611) to operate, so that the drive shaft of the drive motor (611) drives the double-headed reverse thread rotating rod (610) to operate, thereby causing the double-headed reverse thread rotating rod (610) to drive the limit clamps (612) on both sides through the threaded connection. Operation step two: make the limiting clamps (612) on both sides slide inward on the inner wall of the limiting slide groove (613), so that the limiting clamps (612) on both sides simultaneously push the filter inward to position it, so that the bottom end of the filter is located on the sealing fixture of the airtightness test connector (604), which facilitates the subsequent dry airtightness test. Operation Step 3: The controller (3) controls the operation of the electric cylinder (10) so that the moving end of the electric cylinder (10) pushes the lower pressure seat (12) through the connector (13), thereby causing the lower pressure seat (12) to drive the limiting sleeve (11) to slide longitudinally on the outer wall of the mounting column (7), so that the lower pressure seat (12) drives the limiting cylinder (1401) to move downward, thereby causing the limiting cylinder (1401) to seal the filter. Then the controller (3) controls the electric strong magnet (1405) to be energized to generate magnetism, so that the electric strong magnet (1405) magnetically limits the lower pressure slider (1403). Operation step four: The lower slider (1403) slides downward on the outer wall of the limiting post (1402). At the same time, the lower slider (1403) stretches the positioning spring (1404) to facilitate elastic reset after the test is completed. The lower slider (1403) is subjected to the strong magnetic repulsion of the electrically controlled strong magnet (1405), which causes the lower slider (1403) to press down and fix the filter. Operation Step 5: After the filter is fixed, the controller (3) will control the air tightness tester (9) to operate so that the air tightness tester (9) can perform dry air tightness test on the filter. At the same time, the air tightness tester (9) generates an electrical signal that is transmitted to the controller (3) through the wire so that the controller (3) can display the test data in real time. Operation Step Six: After the filter is tested, the magnetic pressing assembly (14) will be reset. Then the controller (3) controls the electric magnet (609) to be energized to generate magnetism, which in turn causes the electric magnet (609) to be energized to generate magnetism and magnetically repel the feeding base plate (606), so that the feeding base plate (606) rotates on the outer wall of the rotating rod (605). At the same time, the feeding base plate (606) drives the limit spring (607) to extend. Operation step seven: Then rotate the loading base plate (606) so that the surface of the loading base plate (606) and the surface of the unloading housing (601) are inclined, so that the filter on the surface of the loading base plate (606) slides outward to unload the material. Then the electric control magnet (609) is de-energized and loses its magnetism, and the stretched limit spring (607) is elastically reset.

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