A dry air tightness detection device and detection system for automobile filter

Abstract

The present invention relates to the technical field of filter air tightness detection, and in particular to a dry-type air tightness detection device for an automobile filter and a detection system thereof, comprising a workbench, and also comprising: a fixing frame, fixedly connected to the top of the workbench, a first electric cylinder fixedly installed on the inner wall of the fixing frame, a piston rod end of the first electric cylinder fixedly connected to a placement frame, an end of the placement frame being provided with an upper U-shaped opening and a lower U-shaped opening; an installation opening, which is penetrated and opened on the side wall of the fixing frame, a connecting plate is vertically slidably connected to the inner wall of the installation opening, and the side wall of the connecting plate is fixedly connected to the placement frame; a controller controls the operation of a blocking mechanism, and after completing the blocking operation, first controls the operation of the first electric cylinder to perform a docking operation between a lower pipe of the filter and a delivery pipe, and then controls a sealing detection unit to detect the air tightness of the riveted joints around the filter.

Description

Technical Field

[0001] The invention relates to the field of filter air tightness detection, and in particular to a dry-type air tightness detection device for an automobile filter and a detection system thereof. Background Art

[0002] Filters are mainly used in automobiles, air compressors and other equipment to filter air or oil, and since filters are used for air and oil filtering, their air tightness is usually required to be quite high. The dry air tightness test of automobile filters mainly uses air pressure detection technology to determine whether the filter meets the air tightness standards. The filter structure mainly includes a riveted shell with a filter element arranged in the shell. Air leakage is prone to occur at the riveted joints, so it is necessary to ventilate the inside of the filter shell through a detection device to detect air leakage at the riveted joints. Most of the existing detection devices manually place the filter on the detection device for detection, which is not convenient for automatically correcting the position of the filter in advance. Sometimes the placement position of the filter may be offset due to manual negligence, thereby affecting the later blocking of the upper and lower pipes of the filter, and further affecting the air tightness detection. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a dry-type air tightness detection device and a detection system for an automobile filter.

[0004] In a first aspect, the present invention provides a dry air tightness detection device for an automobile filter, comprising a workbench and further comprising:

[0005] A fixing frame, fixedly connected to the top of the workbench, a first electric cylinder is fixedly installed on the inner wall of the fixing frame, a placement frame is fixedly connected to the end of the piston rod of the first electric cylinder, an upper U-shaped opening and a lower U-shaped opening are opened at the end of the placement frame, and the upper U-shaped opening and the lower U-shaped opening are respectively used for placing the upper pipe and the lower pipe of the filter;

[0006] An installation opening is formed through the side wall of the fixing frame, a connecting plate is vertically slidably connected to the inner wall of the installation opening, and the side wall of the connecting plate is fixedly connected to the placement frame;

[0007] A blocking mechanism, arranged above the placement rack, for blocking the upper pipe of the filter;

[0008] A delivery pipe is passed through and fixedly connected to the workbench, and a first sealing gasket is provided at the upper end of the delivery pipe;

[0009] The seal detection unit is used to inflate the filter and detect the air tightness of the riveted joints around the filter;

[0010] The controller controls the operation of the plugging mechanism, and after completing the plugging operation, first controls the operation of the first electric cylinder to dock the lower pipe of the filter with the delivery pipe, and then controls the sealing detection unit to detect the air tightness of the riveted joints around the filter.

[0011] During operation, the controller can control the device externally or install it on a workbench, and use external conveying equipment to convey the filter to be tested to the inside of the placement rack, so that the upper pipe of the filter enters the upper U-shaped opening, and the lower pipe of the filter enters the lower U-shaped opening. After the conveying equipment moves the filter to the inspection station, the controller controls the sealing mechanism to first seal the upper pipe of the filter. After the upper pipe is sealed, the controller controls the first electric cylinder to start, and the piston rod of the first electric cylinder pushes the placement rack to move downward along the installation opening. The downward-moving placement rack assists the sealing mechanism to drive the filter that has just been blocked to move downward, so that the lower pipe of the filter is squeezed with the first sealing gasket at the upper end of the delivery pipe, thereby realizing the precise docking of the lower pipe of the filter and the delivery pipe. After the docking is completed, gas is transported to the inside of the filter with the help of the sealing detection unit to detect the air tightness of the filter.

[0012] Preferably, the blocking mechanism comprises:

[0013] A second electric cylinder is fixedly mounted on the top of the fixing frame, the piston rod end of the second electric cylinder passes through the fixing frame and is fixedly connected to a sealing plate after extending, and a second sealing gasket is arranged at the bottom of the sealing plate;

[0014] The position correction component is arranged on the side wall of the placement rack. When the sealing plate moves downward, the position correction component is first linked to correct the placement position of the filter.

[0015] Preferably, the position correction component comprises:

[0016] Two rectangular grooves are symmetrically arranged on the side wall of the placement rack, and a rectangular opening is arranged on the inner wall of each rectangular groove;

[0017] Two sliding plates are respectively slidably connected to the inner walls of the two rectangular grooves, and a correction roller is rotatably mounted on the end of each sliding plate through a mounting seat;

[0018] Two clearance openings are symmetrically opened on the top of the placement rack, the two clearance openings are respectively connected to the inside of the two rectangular grooves, each of the clearance openings is provided with a fixing plate, the two fixing plates are respectively fixedly connected to the top of the adjacent sliding plates, the upper end of the fixing plate passes through the clearance opening and extends upward, and a guide rail is penetrated and opened on the side wall of the fixing plate, and the guide rail is composed of a first vertical opening, an oblique opening and a second vertical opening;

[0019] Two U-shaped frames are symmetrically fixedly connected to the side walls of the sealing plate;

[0020] Two sliding pins are respectively located inside the two guide rails, and the two sliding pins are respectively rotatably connected to the inner walls of the two U-shaped frames;

[0021] The distance sensor is embedded in the top of the placement rack and determines the blocking condition by detecting the distance between the U-shaped rack and the top of the placement rack.

[0022] Preferably, a stable adsorption mechanism is provided on the side wall of the placement rack, which is used to adsorb the surface of the upper pipe and the lower pipe of the filter during the downward movement of the filter:

[0023] The stable adsorption mechanism comprises:

[0024] Two groups of mounting grooves are respectively provided at arc-shaped openings on the inner walls of the upper U-shaped opening and the lower U-shaped opening, and the two groups of mounting grooves are connected through a connecting cavity. A suction cup is installed on the groove wall of each mounting groove, and the pipe end of each suction cup is connected to the inside of the connecting cavity;

[0025] An opening is provided on the side wall of the fixing frame, a placement groove is provided on the inner top surface of the opening, a push plate is provided on the inner wall of the placement groove, the side wall of the push plate is in sealing contact with the inner wall of the placement groove, a hose is fixedly connected to the inner wall of the placement groove, and one end of the hose away from the placement groove is fixedly connected to the inside of the communication cavity;

[0026] A pulling rod, one end of which is fixedly connected to the side wall of the placement rack, and the other end of which is fixedly connected to the bottom of the push plate.

[0027] Preferably, the sealing detection unit comprises:

[0028] A gas storage tank is fixedly installed at the bottom of the workbench, and the gas outlet pipe of the gas storage tank is fixedly connected with the delivery pipe, and the delivery pipe is used to pass gas into the filter;

[0029] A pressure gauge, fixedly connected to the surface of the delivery pipe, is used to detect the initial pressure of the filter and the pressure after a period of time. A solenoid valve is installed inside the delivery pipe;

[0030] A timer, arranged on the side wall of the fixing frame, for timing the time of detection after the gas is introduced;

[0031] The leakage rate calculation unit transmits the detection time and the data detected by the pressure gauge to the leakage rate calculation unit to calculate the leakage rate of the filter.

[0032] Preferably, the specific calculation formula of the leakage rate calculation unit is: ;

[0033] Where, ΔP=P0-P f , P0 is the initial pressure after the filter is inflated, P f is the final pressure after the pressure drops within a certain period of time, Δt is the time from the initial pressure to the final pressure, and V is the sum of the internal volumes of the filter and the delivery pipe.

[0034] In a second aspect, a detection system of a dry air tightness detection device for an automobile filter is provided, wherein the detection system comprises the following steps:

[0035] When the distance sensor detects that the distance between the U-shaped frame and the top of the placement frame reaches the set value, a distance information value is generated;

[0036] The distance sensor sends the distance information value to the controller to generate the first control information to control the operation of the first electric cylinder. The piston rod of the first electric cylinder pushes the placement rack downward to achieve sealed docking between the lower pipe of the auxiliary filter and the delivery pipe.

[0037] After the docking is completed, the controller controls the sealing detection unit to detect the air tightness of the riveted joints around the filter.

[0038] Preferably, the detection system further comprises:

[0039] After the output shafts of the first electric cylinder and the second electric cylinder have completed the set extension, the lower pipe of the filter and the delivery pipe will be sealed and docked, and the controller will generate the second control information and the third control information;

[0040] The controller sends the second control information to the solenoid valve and the gas tank, controls the solenoid valve to open and controls the gas tank to transport gas into the filter through the delivery pipe, and closes the solenoid valve and the gas tank after the set inflation volume is completed;

[0041] The controller sends the third control information to the timer and the pressure gauge to calculate the amount of pressure drop ΔP inside the filter after a period of time;

[0042] The leakage rate of the filter is calculated through the specific calculation formula of the leakage rate calculation unit, and the air tightness of the riveted joints of the filter is evaluated.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. With the help of external conveying equipment, the filter to be tested is conveyed to the inside of the placement rack, so that the upper pipe of the filter enters the upper U-shaped opening, and the lower pipe of the filter enters the lower U-shaped opening. After the conveying equipment moves the filter to the testing station, the controller controls the blocking mechanism to first block the upper pipe of the filter. After the upper pipe is blocked, the controller controls the first electric cylinder to start, and the piston rod of the first electric cylinder pushes the placement rack to move down along the installation opening. The downward-moving placement rack assists the blocking mechanism to drive the filter that has just been blocked to move down, so that the lower pipe of the filter is squeezed with the first sealing gasket at the upper end of the delivery pipe, thereby realizing the precise docking of the lower pipe of the filter and the delivery pipe. After the docking is completed, the sealing detection unit is used to transport gas into the filter, which is conducive to ensuring that the gas does not escape from both ends of the filter and that the gas only circulates inside the filter, thereby more accurately detecting the air tightness of the filter.

[0045] 2. When the controller starts the second electric cylinder, the piston rod of the second electric cylinder will push the sealing plate connected to the second sealing gasket to move downward. During the downward movement of the sealing plate to seal, the linkage position correction component corrects the position of the filter so that the upper and lower pipe surfaces of the filter are in close contact with the arc surfaces of the upper U-shaped opening and the lower U-shaped opening respectively, to avoid the filter entering the placement rack from blocking the upper pipe of the filter and affecting the docking of the lower pipe due to incorrect position. After the position correction is completed, as the sealing plate continues to move downward, the upper pipe of the filter is sealed by means of the squeezing of the second sealing gasket on the pipe mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0047] Figure 2 It is a partial cross-sectional view of the present invention;

[0048] Figure 3 It is a cross-sectional view of the placement rack of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of the guide rail of the present invention;

[0050] Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0051] Figure 6 The present invention is a flow chart of the detection system method steps.

[0052] In the figure: 1. workbench; 2. fixed frame; 3. first electric cylinder; 4. placement frame; 401. upper U-shaped opening; 402. lower U-shaped opening; 5. installation opening; 6. connecting plate; 7. conveying pipe; 8. second electric cylinder; 9. sealing plate; 10. rectangular groove; 11. sliding plate; 12. mounting seat; 13. correction roller; 14. clearance opening; 15. fixed plate; 16. guide rail; 1601. first vertical opening; 1602. oblique opening; 1603. second vertical opening; 17. U-shaped frame; 18. sliding pin; 19. installation groove; 20. connecting cavity; 21. suction cup; 22. opening; 23. placement groove; 24. pushing plate; 25. hose; 26. pulling rod; 27. gas tank; 28. pressure gauge; 29. ​​timer; 30. solenoid valve. DETAILED DESCRIPTION

[0053] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0054] like Figures 1 to 5 The dry air tightness detection device of an automobile filter shown in the figure comprises a workbench 1 and also comprises:

[0055] The fixing frame 2 is fixedly connected to the top of the workbench 1, and a first electric cylinder 3 is fixedly installed on the inner wall of the fixing frame 2. The end of the piston rod of the first electric cylinder 3 is fixedly connected to a placing frame 4. An upper U-shaped opening 401 and a lower U-shaped opening 402 are opened at the end of the placing frame 4. The upper U-shaped opening 401 and the lower U-shaped opening 402 are respectively used for placing the upper pipe and the lower pipe of the filter;

[0056] The installation opening 5 is formed through the side wall of the fixing frame 2, and a connecting plate 6 is vertically slidably connected to the inner wall of the installation opening 5, and the side wall of the connecting plate 6 is fixedly connected to the placement frame 4;

[0057] A blocking mechanism is arranged above the placement rack 4 and is used to block the upper pipe of the filter;

[0058] The delivery pipe 7 is passed through and fixedly connected to the workbench 1, and a first sealing gasket is arranged at the upper end of the delivery pipe 7;

[0059] The seal detection unit is used to inflate the filter and detect the air tightness of the riveted joints around the filter;

[0060] The controller controls the operation of the blocking mechanism, and after completing the blocking operation, first controls the operation of the first electric cylinder 3 to dock the lower pipe of the filter with the delivery pipe 7, and then controls the sealing detection unit to detect the air tightness of the riveted joints around the filter; when working, the controller can control the device in an external manner or install it on the workbench 1, and use the external conveying equipment to convey the filter to be inspected to the inside of the placement rack 4, so that the upper pipe of the filter enters the upper U-shaped opening 401, and the lower pipe of the filter enters the lower U-shaped opening 402. After the conveying equipment moves the filter to the inspection station, the controller controls the blocking mechanism to first dock the lower pipe of the filter with the lower pipe of the filter. The upper pipeline is sealed. After the upper pipeline is sealed, the controller controls the first electric cylinder 3 to start. The piston rod of the first electric cylinder 3 pushes the placement rack 4 to move downward along the installation opening 5. The downward placement rack 4 assists the sealing mechanism to drive the filter that has just completed the sealing to move downward, so that the lower pipeline of the filter is squeezed with the first sealing gasket at the upper end of the delivery pipe 7, thereby realizing the precise docking of the lower pipeline of the filter and the delivery pipe 7. After the docking is completed, the gas is transported to the inside of the filter with the help of the sealing detection unit, which is conducive to ensuring that the gas will not escape from both ends of the filter and ensure that the gas only circulates inside the filter, thereby more accurately detecting the air tightness of the filter.

[0061] As an embodiment of the present invention, the blocking mechanism includes:

[0062] The second electric cylinder 8 is fixedly mounted on the top of the fixing frame 2. The piston rod end of the second electric cylinder 8 passes through the fixing frame 2 and is extended to be fixedly connected to a sealing plate 9. A second sealing gasket is provided at the bottom of the sealing plate 9.

[0063] The position correction component is arranged on the side wall of the placement rack 4. When the sealing plate 9 moves downward, the position correction component is first linked to correct the placement position of the filter. During operation, the position of the filter transported by the external transporting equipment will inevitably have some errors, resulting in the upper and lower pipes of the filter failing to fit tightly with the arc surfaces of the upper U-shaped opening 401 and the lower U-shaped opening 402. In the later sealing and inflation sealing detection process, it is easy to cause the pipe docking to be out of position, which will seriously affect the sealing and the sealing of the docking point, and then affect the air tightness test result of the filter. Therefore, when the controller starts the second electric cylinder 8, the second The piston rod of the electric cylinder 8 will push the sealing plate 9 connected to the second sealing gasket to move downward. During the downward movement of the sealing plate 9 for sealing, the linkage position correction component corrects the position of the filter so that the upper and lower pipe surfaces of the filter are in close contact with the arc surfaces of the upper U-shaped opening 401 and the lower U-shaped opening 402 respectively, to avoid the filter entering the placement rack 4 from blocking the upper pipe of the filter and affecting the docking of the lower pipe due to incorrect position. After the position correction is completed, as the sealing plate 9 continues to move downward, the upper pipe of the filter is sealed by means of the squeezing of the second sealing gasket on the pipe mouth.

[0064] As an embodiment of the present invention, the position correction component includes:

[0065] Two rectangular grooves 10 are symmetrically opened on the side wall of the placement rack 4, and a rectangular opening is opened on the inner wall of each rectangular groove 10;

[0066] Two sliding plates 11 are respectively slidably connected to the inner walls of the two rectangular grooves 10, and a correction roller 13 is rotatably mounted on the end of each sliding plate 11 through a mounting seat 12;

[0067] Two clearance openings 14 are symmetrically opened on the top of the placement rack 4, and the two clearance openings 14 are respectively connected to the inside of the two rectangular grooves 10. A fixing plate 15 is provided in each clearance opening 14, and the two fixing plates 15 are respectively fixedly connected to the top of the adjacent sliding plate 11. The upper end of the fixing plate 15 passes through the clearance opening 14 and extends upward. A guide rail 16 is opened through the side wall of the fixing plate 15, and the guide rail 16 is composed of a first vertical opening 1601, an oblique opening 1602 and a second vertical opening 1603 connected to each other;

[0068] Two U-shaped frames 17 are symmetrically fixedly connected to the side walls of the sealing plate 9;

[0069] Two sliding pins 18 are respectively located inside the two guide rails 16, and the two sliding pins 18 are rotatably connected to the inner walls of the two U-shaped frames 17;

[0070] The distance sensor is embedded in the top of the placement rack 4, and the blocking condition is judged by detecting the distance between the U-shaped frame 17 and the top of the placement rack 4; when working, when the piston rod of the second electric cylinder 8 is in the initial non-expanded state, the sealing plate 9 has not yet blocked and sealed the upper pipe of the filter, and the sliding pin 18 connected to the inner wall of the U-shaped frame 17 is located inside the first vertical opening 1601. When the second electric cylinder 8 is started to drive the mounting plate connected to the sealing plate 9 to move downward, since the U-shaped frame 17 is fixedly connected to the sealing plate 9 Therefore, when the sealing plate 9 moves downward to block the upper pipe of the filter, the sliding pin 18 will be driven downward, and the surface of the sliding pin 18 that moves downward will push the inner wall of the oblique opening 1602. The inner wall of the oblique opening 1602 is forced to cause the fixed plate 15 to pull the connecting frame to move to one side of the filter. The moving connecting frame drives the sliding plate 11 equipped with the correction roller 13 to move through the rectangular opening. The rolling surfaces of the two correction rollers 13 pass through the upper pipe surface of the filter respectively, pushing the filter When the sliding pin 18 slides to the junction of the oblique opening 1602 and the second vertical opening 1603, the first sealing gasket at the bottom of the downwardly moved sealing plate 9 contacts the upper pipe of the filter. As the sealing plate 9 drives the sliding pin 18 to continue to slide downward to the inside of the second vertical opening 1603, the first sealing gasket arranged at the bottom of the sealing plate 9 is compressed, thereby sealing the upper pipe of the filter. After the sealing is completed, the distance sensor detects that the distance from the U-shaped frame 17 to the top of the placement frame 4 reaches the set distance value, and sends information to the controller to start the operation of the first electric cylinder 3. At this time, the piston rods of the first electric cylinder 3 and the second electric cylinder 8 jointly push the placement frame 4 to move downward, thereby realizing the downward movement of the filter, facilitating the sealed docking between the lower pipe of the filter and the delivery pipe 7, thereby facilitating the air tightness detection of the filter.

[0071] After the air tightness test of the filter is completed, the piston rods of the first electric cylinder 3 and the second electric cylinder 8 will move up and retract synchronously. After the piston rod of the first electric cylinder 3 is moved up and reset, it drives the placement rack 4 to move up and reset to the initial state and be limited. At this time, the first electric cylinder 3 stops operating, and the piston rod of the second electric cylinder 8 continues to move up and retract, driving the sealing plate 9 to move up and gradually cancel the blockage of the pipe on the filter, and with the help of the sliding pin 18 pushing the inner wall of the oblique opening 1602, it drives the correction roller 13 to move to the rectangular opening, canceling the obstruction of the pipe on the filter by the correction roller 13, and facilitating the removal of the filter from the inspection workstation.

[0072] As an embodiment of the present invention, a stable adsorption mechanism is provided on the side wall of the placement rack 4, which is used to adsorb the surface of the upper pipe and the lower pipe of the filter during the downward movement of the filter:

[0073] Stable adsorption mechanism includes:

[0074] Two groups of mounting grooves 19 are respectively provided at arc-shaped openings on the inner walls of the upper U-shaped opening 401 and the lower U-shaped opening 402. The two groups of mounting grooves 19 are connected through a connecting cavity 20. A suction cup 21 is installed on the groove wall of each mounting groove 19. The end of the pipe opening of each suction cup 21 is connected to the inside of the connecting cavity 20.

[0075] An opening 22 is formed on the side wall of the fixing frame 2, a placement groove 23 is formed on the inner top surface of the opening 22, a push plate 24 is formed on the inner wall of the placement groove 23, the side wall of the push plate 24 is in sealing contact with the inner wall of the placement groove 23, a hose 25 is fixedly connected to the inner wall of the placement groove 23, and one end of the hose 25 away from the placement groove 23 is fixedly connected to the inside of the communication cavity 20;

[0076] The pull rod 26 has one end fixedly connected to the side wall of the placement rack 4, and the other end fixedly connected to the bottom of the push plate 24. When working, after the placement position of the filter is adjusted, since it is necessary to transport gas into the filter during the sealing test, the filter needs to maintain a stable state to prevent the filter from shaking or rotating due to the input gas. After the upper pipe of the filter is blocked by the sealing plate 9 connected to the second sealing gasket, it will move downward with the placement rack 4. The downwardly moved placement rack 4 drives the push plate 24 to move downward with the help of the pull rod 26. Since the side of the push plate 24 The wall is in sealing contact with the inner wall of the placement groove 23. Therefore, when the pushing plate 24 moves downward synchronously with the placement rack 4, the hose 25 is used to form a negative pressure inside the connecting cavity 20 and multiple suction cups 21. The suction cups 21 adsorb the surfaces of the upper and lower pipes of the filter, which is beneficial to stably limit the upper and lower pipes of the filter at the arc-shaped openings on the inner walls of the upper U-shaped opening 401 and the lower U-shaped opening 402, respectively. Under the obstruction of the two correction rollers 13, it is beneficial to maintain the stability of the filter, avoiding the filter from shaking and being unstable due to the input gas in the later stage, thereby affecting the blocking and sealing docking.

[0077] As an embodiment of the present invention, the sealing detection unit includes:

[0078] The gas storage tank 27 is fixedly installed at the bottom of the workbench 1, and the gas outlet pipe of the gas storage tank 27 is fixedly connected with the delivery pipe 7, and the delivery pipe 7 is used to pass gas into the filter;

[0079] A pressure gauge 28 is fixedly connected to the surface of the delivery pipe 7 and is used to detect the initial pressure of the filter and the pressure after a period of time. A solenoid valve 30 is installed inside the delivery pipe 7;

[0080] A timer 29 is provided on the side wall of the fixing frame 2 to count the time for detection after the gas is introduced;

[0081] The leakage rate calculation unit transmits the detection time and the data detected by the pressure gauge 28 to the leakage rate calculation unit to calculate the leakage rate of the filter;

[0082] As an implementation manner of the present invention, the specific calculation formula of the leakage rate calculation unit is: ;

[0083] Where, ΔP=P0-P f , P0 is the initial pressure after the filter is inflated, P f is the final pressure after the pressure drops within a certain period of time, Δt is the time from the initial pressure to the final pressure, and V is the sum of the internal volumes of the filter and the delivery pipe 7.

[0084] During operation, after the output shafts of the first electric cylinder 3 and the second electric cylinder 8 have completed the set extension, the lower pipe of the filter and the delivery pipe 7 will be sealed and connected, the solenoid valve 30 is controlled by the controller to open and gas is delivered to the delivery pipe 7 through the gas storage tank 27, and the appropriate inflation pressure is selected according to the design requirements of the filter. After inflation is completed, the solenoid valve 30 is closed, and the timer 29 starts timing. The set pressure gauge 28 will detect the initial pressure P0 after the filter is inflated, and as time passes, the pressure gauge 28 detects the final pressure P after the filter internal pressure drops after a period of time. f , the pressure drop ΔP and the time Δt from the initial pressure to the final pressure are brought into the calculation formula of the leakage rate calculation unit. The volume V inside the filter and the delivery pipe 7 is measured in advance, and other conditions remain unchanged. The leakage rate of the filter can be calculated to determine whether the leakage rate is within the standard value, thereby accurately evaluating the air tightness of the riveted joint of the filter.

[0085] like Figure 6 A detection system of a dry air tightness detection device for an automobile filter is shown, and the detection system comprises the following steps:

[0086] When the distance sensor detects that the distance between the U-shaped frame 17 and the top of the placement frame 4 reaches a set value, a distance information value is generated;

[0087] The distance sensor sends the distance information value to the controller to generate the first control information to control the operation of the first electric cylinder 3. The piston rod of the first electric cylinder 3 pushes the placement rack 4 downward to achieve sealed docking between the lower pipe of the auxiliary filter and the delivery pipe 7.

[0088] After the docking is completed, the controller controls the sealing detection unit to detect the air tightness of the riveted joints around the filter.

[0089] As an embodiment of the present invention, the detection system further includes:

[0090] After the output shafts of the first electric cylinder 3 and the second electric cylinder 8 have completed the set extension, the lower pipe of the filter and the delivery pipe 7 will be sealed and docked, and the controller generates the second control information and the third control information;

[0091] The controller sends the second control information to the solenoid valve 30 and the gas tank 27, controls the solenoid valve 30 to open and controls the gas tank 27 to deliver gas to the inside of the filter through the delivery pipe 7, and closes the solenoid valve 30 and the gas tank 27 after the set inflation volume is completed;

[0092] The controller sends the third control information to the timer 29 and the pressure gauge 28 to calculate the amount of pressure drop ΔP inside the filter after a period of time;

[0093] The leakage rate of the filter is calculated through the specific calculation formula of the leakage rate calculation unit, and the air tightness of the riveted joints of the filter is evaluated.

[0094] Working principle of the present invention: the controller can control the device in an external manner or install it on the workbench 1, and use external conveying equipment to convey the filter to be tested to the inside of the placement rack 4, so that the upper pipe of the filter enters the upper U-shaped opening 401, and the lower pipe of the filter enters the lower U-shaped opening 402. After the conveying equipment moves the filter to the detection station, the controller controls the blocking mechanism to first block the upper pipe of the filter. After the upper pipe is blocked, the controller controls the first electric cylinder 3 to start, and the piston rod of the first electric cylinder 3 pushes the placement rack 4 to move downward along the installation opening 5. The placement rack 4 that moves downward assists the blocking mechanism to drive the filter that has just completed the blocking to move downward, so that the lower pipe of the filter is squeezed with the first sealing gasket at the upper end of the delivery pipe 7, thereby realizing the precise docking of the lower pipe of the filter and the delivery pipe 7. After the docking is completed, the gas is transported to the inside of the filter with the help of the sealing detection unit, which is conducive to ensuring that the gas will not escape from both ends of the filter and ensure that the gas only circulates inside the filter, thereby more accurately detecting the air tightness of the filter.

[0095] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A dry air tightness testing device for an automobile filter, comprising a workbench (1), characterized in that: Also includes: A fixing frame (2) is fixedly connected to the top of the workbench (1); a first electric cylinder (3) is fixedly mounted on the inner wall of the fixing frame (2); the end of the piston rod of the first electric cylinder (3) is fixedly connected to a placement frame (4); an upper U-shaped opening (401) and a lower U-shaped opening (402) are formed at the end of the placement frame (4); the upper U-shaped opening (401) and the lower U-shaped opening (402) are respectively used for placing the upper pipe and the lower pipe of the filter; An installation opening (5) is formed through a side wall of the fixing frame (2); a connecting plate (6) is vertically slidably connected to the inner wall of the installation opening (5); and a side wall of the connecting plate (6) is fixedly connected to the placement frame (4); A blocking mechanism, arranged above the placement rack (4), and used for blocking the upper pipe of the filter; A delivery pipe (7) is passed through and fixedly connected to the workbench (1), and a first sealing gasket is provided at the upper end of the delivery pipe (7); The seal detection unit is used to inflate the filter and detect the air tightness of the riveted joints around the filter; A controller controls the operation of the plugging mechanism, and after completing the plugging operation, first controls the operation of the first electric cylinder (3) to perform a docking operation between the lower pipe of the filter and the delivery pipe (7), and then controls the sealing detection unit to detect the air tightness of the riveted joints around the filter; The blocking mechanism comprises: A second electric cylinder (8) is fixedly mounted on the top of the fixing frame (2), the piston rod end of the second electric cylinder (8) passes through the fixing frame (2) and is extended to be fixedly connected to a sealing plate (9), and a second sealing gasket is provided at the bottom of the sealing plate (9); A position correction component is arranged on the side wall of the placement frame (4), and when the sealing plate (9) moves downward, the position correction component is first linked to correct the placement position of the filter; The position correction component comprises: Two rectangular grooves (10) are symmetrically arranged on the side wall of the placement rack (4), and a rectangular opening is arranged on the inner wall of each rectangular groove (10); Two sliding plates (11) are respectively slidably connected to the inner walls of the two rectangular grooves (10), and a correction roller (13) is rotatably mounted on the end of each sliding plate (11) through a mounting seat (12); Two clearance openings (14) are symmetrically opened on the top of the placement rack (4), and the two clearance openings (14) are respectively connected to the inside of the two rectangular grooves (10). A fixed plate (15) is provided in each of the clearance openings (14), and the two fixed plates (15) are respectively fixedly connected to the top of the adjacent sliding plate (11). The upper end of the fixed plate (15) passes through the clearance opening (14) and extends upward. A guide rail (16) is opened through the side wall of the fixed plate (15), and the guide rail (16) is composed of a first vertical opening (1601), an oblique opening (1602) and a second vertical opening (1603) connected to each other; Two U-shaped frames (17) are symmetrically fixedly connected to the side walls of the sealing plate (9); Two sliding pins (18) are respectively located inside the two guide rails (16), and the two sliding pins (18) are respectively rotatably connected to the inner walls of the two U-shaped frames (17); A distance sensor is embedded in the top of the placement rack (4) and determines the blocking condition by detecting the distance between the U-shaped rack (17) and the top of the placement rack (4); The side wall of the placement rack (4) is provided with a stable adsorption mechanism, which is used to adsorb the surfaces of the upper pipe and the lower pipe of the filter during the downward movement of the filter: The stable adsorption mechanism comprises: Two groups of mounting grooves (19) are respectively provided at arc-shaped openings on the inner walls of the upper U-shaped opening (401) and the lower U-shaped opening (402); the two groups of mounting grooves (19) are connected via a connecting cavity (20); a suction cup (21) is installed on the groove wall of each mounting groove (19); and the pipe end of each suction cup (21) is connected to the inside of the connecting cavity (20); An opening (22) is formed through the side wall of the fixing frame (2); a placement groove (23) is formed on the inner top surface of the opening (22); a push plate (24) is provided on the inner wall of the placement groove (23); the side wall of the push plate (24) is in sealing contact with the inner wall of the placement groove (23); a hose (25) is fixedly connected to the inner wall of the placement groove (23); and one end of the hose (25) away from the placement groove (23) is fixedly connected to the inside of the communication cavity (20); A pulling rod (26), one end of the pulling rod (26) is fixedly connected to the side wall of the placement rack (4), and the other end of the pulling rod (26) is fixedly connected to the bottom of the pushing plate (24).

2. The dry air tightness detection device for automobile filter according to claim 1, characterized in that: The sealing detection unit comprises: A gas storage tank (27) is fixedly mounted on the bottom of the workbench (1); an outlet pipe of the gas storage tank (27) is fixedly connected to the delivery pipe (7), and the delivery pipe (7) is used to pass gas into the filter; a pressure gauge (28) fixedly connected to the surface of the delivery pipe (7) and used to detect the initial pressure of the filter and the pressure after a period of time; a solenoid valve (30) is installed inside the delivery pipe (7); A timer (29) is arranged on the side wall of the fixing frame (2) and measures the time for detection after the gas is introduced; The leakage rate calculation unit transmits the detection time and the data detected by the pressure gauge (28) to the leakage rate calculation unit to calculate the leakage rate of the filter.

3. The dry air tightness detection device for automobile filter according to claim 2, characterized in that: The specific calculation formula of the leakage rate calculation unit is: ; Where, ΔP=P0-P f , P0 is the initial pressure after the filter is inflated, P f is the final pressure after the pressure drops within a certain period of time, Δt is the time from the initial pressure to the final pressure, and V is the sum of the internal volumes of the filter and the delivery pipe (7).

4. A detection system for a dry-type air tightness detection device for an automobile filter, suitable for a dry-type air tightness detection device for an automobile filter as claimed in claim 1, characterized in that: The detection system includes the following steps: When the distance sensor detects that the distance between the U-shaped frame (17) and the top of the placement frame (4) reaches a set value, a distance information value is generated; The distance sensor sends the distance information value to the controller to generate first control information to control the operation of the first electric cylinder (3); the piston rod of the first electric cylinder (3) pushes the placement rack (4) downward to achieve sealed docking between the lower pipe of the auxiliary filter and the delivery pipe (7); After the docking is completed, the controller controls the sealing detection unit to detect the air tightness of the riveted joints around the filter.

5. The detection system of the dry air tightness detection device of the automobile filter according to claim 4, characterized in that: The detection system also includes: After the output shafts of the first electric cylinder (3) and the second electric cylinder (8) have completed the set extension amount, the lower pipe of the filter and the delivery pipe (7) are sealed and docked, and the controller generates second control information and third control information; The controller sends the second control information to the solenoid valve (30) and the gas storage tank (27), controls the solenoid valve (30) to open, and controls the gas storage tank (27) to deliver gas to the inside of the filter via the delivery pipe (7), and after the set gas filling volume is completed, closes the solenoid valve (30) and the gas storage tank (27); The controller sends the third control information to the timer (29) and the pressure gauge (28), and calculates the amount of pressure drop ΔP inside the filter after a period of time; The leakage rate of the filter is calculated through the specific calculation formula of the leakage rate calculation unit, and the air tightness of the riveted joints of the filter is evaluated.

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