Leak detector for testing product air tightness

Abstract

This invention relates to a leak detector for testing the airtightness of products. It includes a machine tool, a feeding conveyor belt for transporting products, a feeding and pushing device for moving the products, a leak detector for testing the airtightness of the products, and a discharging conveyor belt for transporting products, as well as a control device. The feeding conveyor belt, feeding and pushing device, leak detector, and discharging conveyor belt are all electrically connected to the control device. The leak detector includes a placement platform for placing products, a tensioning device for fixing products to the placement platform, a cover with a leak detection chamber, an inflation device for filling the products with gas, and a pressure sensor for monitoring the pressure value of the leak detection chamber. The pressure sensor monitors the pressure value of the leak detection chamber and determines the airtightness of the products based on the pressure value. The entire process is automated, and the use of a pressure sensor for testing the airtightness of the products ensures accurate detection, improving the practicality of the leak detector.

Description

Technical Field

[0001] The invention relates to a leak detector for detecting the air tightness of a product. Background Art

[0002] Air tightness: refers to whether there is leakage in the joints of the container. For example, the air tightness of the liquefied gas tank must be strictly checked after welding to prevent accidents caused by leakage after inflation.

[0003] A filter is an accessory that filters impurities or gases through filter paper. The filter needs to be tested for air tightness before leaving the factory to eliminate unqualified products.

[0004] The air tightness test of the existing filter adopts a filter clamping tool set on the inner side of the water tank. The filter is clamped on the tooling, and the filter is sealed by the filter clamping tooling. The water level in the water tank rises to cover the testing station, and then the filter at the filter clamping tooling is subjected to an air tightness test. Under the structural design of the existing filter air tightness testing equipment, the testing efficiency is low. Summary of the invention

[0005] The object of the present invention is to provide a leak detector for detecting the air tightness of a product with accurate air tightness detection and high air tightness detection efficiency.

[0006] The object of the present invention is achieved in that:

[0007] A leak detector for detecting air tightness of a product, comprising a machine tool, a feed conveyor belt for conveying products, a feed pusher device for pushing the product to move, a leak detector device for detecting air tightness of the product, a discharge conveyor belt for conveying the product, and a control device, wherein the feed conveyor belt, the feed pusher device, the leak detector device, and the discharge conveyor belt are electrically connected to the control device respectively;

[0008] The leak detection device includes a display table for placing products, a tensioning device for fixing the products on the display table, a cover body with a leak detection cavity, an inflation device for inflating gas into the product, and a pressure sensor for monitoring the pressure value of the leak detection cavity;

[0009] The feed pushing device includes a feed swing arm for moving the product on the feed conveyor belt to the display table. When the product is moved to the display table, the cover body moves and sits on the display table so that the product is placed in the leak detection chamber. Then the inflation device fills the gas into the product. At the same time, the pressure sensor monitors the pressure value of the leak detection chamber and judges the air tightness of the product based on the pressure value.

[0010] The feed pushing device transports the product on the feed conveyor belt to the display table, and then the cover body moves and sits on the display table. At this time, the product enters the detection cavity of the cover body, and the inflation device fills gas into the product. The pressure sensor monitors the pressure value of the detection cavity. If the pressure value monitored by the pressure sensor is within the set range, it means that the air tightness of the product is intact. If the pressure value monitored by the pressure sensor is abnormal, it means that the air tightness of the product has failed, causing gas to leak into the detection cavity, resulting in abnormal pressure value. The air tightness condition is easy to judge. When the product inspection is completed, the discharging conveyor belt transports the product out. The whole process is automated, and the pressure sensor is used to detect the air tightness of the product. The detection is accurate, thereby improving the practicality of the leak detector.

[0011] The purpose of the present invention can also be solved by the following technical measures:

[0012] As a more specific solution, it also includes a positioning device for positioning the product on a display table, the positioning device includes a first clamp, a second clamp, a first gear, a second gear and a first cylinder, the first gear and the second gear are meshed, the first clamp is connected to the first gear, the second clamp is connected to the second gear, the telescopic rod of the first cylinder is connected to the first gear, when the first cylinder is actuated, the first cylinder drives the first gear to rotate, and the second gear follows the first gear to rotate, so that the first clamp and the second clamp are separated from each other or brought closer to each other, thereby adjusting the position of the product.

[0013] When the first clamp and the second clamp clamp the product, the first clamp and the second clamp adjust the position of the product, so that the product is placed on the display table more accurately, thereby improving the practicality of the leak detector.

[0014] As a more specific solution, a rubber pad is provided on the surface of the display table. By providing the rubber pad, the rubber pad and the cover body are in close contact, thereby improving the sealing performance of the display table and the cover body, and the rubber pad and the product are in close contact, thereby improving the sealing performance of the display table and the product, thereby improving the detection accuracy.

[0015] As a more specific solution, the tensioning device includes a pull rod, a hand claw, a second cylinder, a third cylinder and a spring, the placing table has an opening, the placing table sits on the third cylinder, the second cylinder and the third cylinder are connected, and the second cylinder controls the lifting of the third cylinder;

[0016] One end of the pull rod is provided with a support head, and the other end of the pull rod passes through the opening of the display table to connect to the third cylinder, and the third cylinder drives the pull rod to rise and fall, and the claws are arranged around the outer periphery of the pull rod at intervals, and an elastic sleeve is formed between the claws;

[0017] The spring is sleeved on the pull rod, one end of the spring abuts against the elastic sleeve, and the other end of the spring abuts against the third cylinder, and the spring constitutes a reset mechanism of the elastic sleeve;

[0018] When the second cylinder drives the third cylinder to rise, the elastic sleeve and the pull rod rise and expose the display table. When the third cylinder drives the pull rod to descend, the expansion head enters the inner cavity of the elastic sleeve and gradually expands the elastic sleeve so that the upper diameter of the elastic sleeve is larger than its lower diameter.

[0019] The second cylinder of the tensioning device pulls the third cylinder to rise, at which time the pull rod and the elastic sleeve rise and expose the display table, and then the third cylinder pulls the pull rod to descend, at which time the expansion head of the pull rod enters the inner cavity of the elastic sleeve and gradually expands the elastic sleeve to make the upper diameter of the elastic sleeve larger than its lower diameter until the elastic sleeve is expanded to the maximum range, and then the third cylinder continues to pull the pull rod and drive the elastic sleeve to descend together, at which time the elastic sleeve remains in an expanded state under the action of the spring, and at this time the claws of the elastic sleeve hook the product, tighten and lock the product to prevent the product from loosening.

[0020] As a more specific solution, the third cylinder is provided with an air cylinder, one side of the air cylinder is provided with an air inlet joint, the expansion head is provided with an exhaust port, the pull rod is provided with an exhaust channel, the pull rod passes through the air cylinder to connect to the third cylinder, the inlet of the exhaust channel is connected to the inner cavity of the air cylinder, and the outlet of the exhaust channel is connected to the exhaust port.

[0021] As a more specific solution, a convex hook is provided near the upper end of the outer wall of the gripper. By providing the convex hook, the convex hook hooks the product tightly to prevent the product from loosening, thereby improving the practicality of the leak detector.

[0022] As a more specific solution, it also includes a rotating platform, the rotating platform includes an upper turntable, a lower turntable and a fourth cylinder, a working area is formed between the upper turntable and the lower turntable, the fourth cylinder is arranged at intervals at the bottom of the upper turntable, the telescopic rod of the fourth cylinder is connected to the cover body, the fourth cylinder drives the cover body to move up and down, and the placement table is arranged at intervals on the surface of the lower turntable, and the position of the placement table corresponds to the position of the cover body. By providing a rotating platform, multiple groups of leak detection devices are placed on the rotating platform, and each group of leak detection devices can detect products, greatly improving the detection efficiency of products.

[0023] As a more specific solution, a filling body is also included, and the filling body is placed in the inner cavity of the cover to adjust the space size of the leak detection cavity. The user can fill the filling body into the cover to adjust the space size of the leak detection cavity according to the shape of the product, so that the detection machine can detect multiple types of products, and when the space size of the leak detection cavity is adjusted to be close to the shape and size of the product, the detection accuracy is higher.

[0024] As a more specific scheme, the feed pushing device includes at least one group of pushing components, a feed turntable, a driving mechanism and a touch plate. Each group of pushing components is arranged at intervals along the circumferential direction of the feed turntable. Each group of pushing components includes the feed push arm, the push arm cylinder and the mechanical valve. The push arm cylinder is fixed on the feed turntable, the telescopic rod of the push arm cylinder is connected to the feed push arm, the mechanical valve and the push arm cylinder are connected together and rotate with the feed turntable, the mechanical valve and the push arm cylinder are electrically connected, the driving mechanism is connected to the feed turntable, the driving mechanism drives the feed turntable to rotate, the touch plate is located on one side of the feed turntable, and a roller is provided at the contact piece of the mechanical valve. When the mechanical valve rotates to the touch plate position, the roller slides on the touch plate, and the roller presses the contact piece of the mechanical valve to keep the mechanical valve in an on state at all times. The mechanical valve starts the push arm cylinder, and the push arm cylinder pushes the feed push arm to move. The user places the product (such as a filter) on the feed conveyor belt, the feed motor drives the feed turntable to rotate, and the feed push arm moves the product on the feed conveyor belt to the display table. At this time, the roller just enters the touch plate and slides on the touch plate, causing the mechanical valve to connect the air source of the push arm cylinder. The telescopic rod of the push arm cylinder pushes the feed push arm backward, so that the feed push arm is away from the product and blocks another product to avoid the products being crowded together. When the rotating platform drives the product to another position, the roller just leaves the touch plate, causing the mechanical valve to disconnect the air source of the push arm cylinder. The telescopic rod of the push arm cylinder contracts to drive the feed push arm to reset, and this reciprocating cycle is repeated to place the products on the display table in an orderly manner.

[0025] As a more specific solution, it also includes a discharging pushing device, which includes a discharging swing arm, a discharging turntable and a discharging motor for moving the products on the display table to the discharging conveyor belt. The discharging swing arm is arranged on the discharging turntable at intervals along the circumferential direction of the discharging turntable, and the discharging motor is connected to the discharging turntable, and the discharging motor drives the discharging turntable to rotate.

[0026] The beneficial effects of the present invention are as follows:

[0027] In the present invention, the feed pushing device transports the product on the feed conveyor belt to the display table, and then the cover body moves and sits on the display table. At this time, the product enters the detection cavity of the cover body, and the inflation device fills gas into the product. The pressure sensor monitors the pressure value of the detection cavity. If the pressure value monitored by the pressure sensor is within the set range, it indicates that the air tightness of the product is intact. If the pressure value monitored by the pressure sensor is abnormal, it indicates that the air tightness of the product has a fault, causing gas to leak into the detection cavity, causing an abnormal pressure value. The air tightness condition is easy to judge. When the product inspection is completed, the discharging conveyor belt transports the product out. The whole process is automated, and the pressure sensor is used to detect the air tightness of the product. The inspection is accurate, thereby improving the practicality of the leak detector.

[0028] In the present invention, the second cylinder of the tensioning device pulls the third cylinder to rise, at which time the pull rod and the elastic sleeve rise and expose the display table, and then the third cylinder pulls the pull rod to descend, and at this time the expansion head of the pull rod enters the inner cavity of the elastic sleeve and gradually expands the elastic sleeve to make the upper diameter of the elastic sleeve larger than its lower diameter until the elastic sleeve is expanded to the maximum range, and then the third cylinder continues to pull the pull rod and drive the elastic sleeve to descend together, and at this time the elastic sleeve remains in an expanded state under the action of the spring, and at this time the claws of the elastic sleeve hook the product, tighten and lock the product to prevent the product from loosening.

[0029] In the present invention, the user places the product (such as a filter) on the feed conveyor belt, the feed motor drives the feed turntable to rotate, and the feed push arm moves the product on the feed conveyor belt to the display table. At this time, when the roller just enters the touch plate and slides on the touch plate, the mechanical valve connects to the air source of the push arm cylinder, and the telescopic rod of the push arm cylinder pushes the feed push arm backward, so that the feed push arm is away from the product and blocks another product to avoid the products being crowded together. When the rotating platform drives the product to move to another position, the roller just leaves the touch plate, so that the mechanical valve disconnects the air source of the push arm cylinder, and the telescopic rod of the push arm cylinder contracts to drive the feed push arm to reset, and this reciprocating cycle is repeated to place the products on the display table in an orderly manner.

[0030] According to the present invention, the user can fill the filling body into the cover body to adjust the space size of the leak detection cavity according to the shape of the product, so that the detection machine can detect multiple types of products. Moreover, when the space size of the leak detection cavity is adjusted to be close to the shape and size of the product, the detection accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of a leak detector for testing the air tightness of a product.

[0032] Figure 2 Schematic diagram of a leak detector for testing the air tightness of products (the feed push arm rotates with the turntable to push the products on the feed conveyor belt into the display table).

[0033] Figure 3 Schematic diagram of a leak detector for testing the air tightness of products (the feed push arm moves away from the product on the display table).

[0034] Figure 4 Schematic diagram of the leak detector for testing the air tightness of products (the feed push arm returns to its initial state and rotates with the turntable).

[0035] Figure 5 Schematic diagram of the feeding and discharging parts of a leak detector for testing the air tightness of products.

[0036] Figure 6 Schematic diagram of the feeding and pushing device of the leak detector for testing the air tightness of products (the telescopic rod of the push arm cylinder is in the retracted state).

[0037] Figure 7 Schematic diagram of the feeding and pushing device of the leak detector for testing the air tightness of products (the telescopic rod of the push arm cylinder is in the extended state).

[0038] Figure 8 Schematic diagram of a leak detector for testing the air tightness of a product (part of the housing is hidden).

[0039] Fig. 9 Schematic diagram of the placement table for the leak detector for testing the air tightness of the product without exposing the pull rod.

[0040] Fig.10 Schematic diagram of the pull rod exposure display table of the leak detector for testing the air tightness of the product.

[0041] Fig.11 A schematic cross-sectional view of the pull rod of a leak detector for testing the air tightness of a product showing the placement table.

[0042] Fig.12 Schematic diagram of the pull rod of the leak detector exposed from the placement table and tightened to detect the air tightness of the product.

[0043] Fig.13 A cross-sectional diagram of the pull rod of a leak detector for testing the air tightness of a product being exposed from a placement table and tightened.

[0044] Fig.14 Schematic diagram of the fourth cylinder and cover of the leak detector for detecting the air tightness of the product.

[0045] Fig.15 Schematic diagram of the positioning device of the leak detector for detecting the air tightness of the product (product released state).

[0046] Fig.16 Schematic diagram of the positioning device of the leak detector for testing the air tightness of the product (clamping the product). DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0048] Example, combined with Figures 1 to 16 A leak detector for detecting the air tightness of a product is shown, comprising a machine tool 1, a feed conveyor belt 2 for transporting a product 100, a feed pushing device 3 for pushing the product 100 to move, a leak detection device 4 for detecting the air tightness of the product 100, a rotating platform 5, a discharge conveyor belt 6 for transporting the product 100, and a control device, wherein the feed conveyor belt 2, the feed pushing device 3, the leak detection device 4, the positioning device, the rotating platform 5, and the discharge conveyor belt 6 are electrically connected to the control device respectively.

[0049] The feed conveyor belt 2 is located at the entrance of the rotating platform 5, and the feed pushing device 3 is located between the feed conveyor belt 2 and the entrance of the rotating platform 5. The feed pushing device 3 includes at least one group of pushing components 31, a feed turntable 32, a driving mechanism, an outer cylinder 34 and a touch plate 35. The driving mechanism is a feed motor (not shown in the figure). The outer cylinder 34 is sleeved on the rotating shaft of the feed motor. The rotating shaft of the feed motor passes through the outer cylinder 34 and extends out of the outer cylinder 34 to connect to the feed turntable 32. The feed motor drives the feed turntable 32 to rotate. The touch plate 35 is arranged on the outer cylinder 34 and is located on one side of the feed turntable 32.

[0050] Each group of pushing components 31 includes a feed pushing arm 311, a pushing arm cylinder 312 and a mechanical valve 313. A slot 3111 is provided at one end of the feed pushing arm 311. Part of the feed turntable 32 is inserted into the slot 3111. The feed turntable 32 and the slot 3111 are connected together by a rotating shaft 3112. The feed pushing arm 311 swings at a small angle with the rotating shaft 3112 as the rotation center. The other end of the feed pushing arm 311 extends outward, and is used to move the product 100 on the feed conveyor belt 2 to the display table.

[0051] The push arm cylinder 312 is arranged on the feed turntable 32, the telescopic rod of the push arm cylinder 312 is connected to the feed push arm 311, the mechanical valve 313 is electrically connected to the push arm cylinder 312, and the mechanical valve 313 is fixed on the push arm cylinder 312 and rotates synchronously with the push arm cylinder 312, so that multiple groups of push components 31 are arranged on the turntable at intervals along the circumferential direction.

[0052] A roller 33 is provided at the contact piece of the mechanical valve 313. When the roller 33 slides on the touch plate 35, the roller 33 presses the contact piece of the mechanical valve 313 to keep the mechanical valve 313 always in the on state. The mechanical valve 313 starts the push arm cylinder 312, and the push arm cylinder 312 drives the feed push arm 311 to move.

[0053] The rotating platform 5 includes an upper turntable 51, a lower turntable 52 and a fourth cylinder 53. A working area is formed between the upper turntable 51 and the lower turntable 52. A plurality of fourth cylinders 53 are arranged at intervals at the bottom of the upper turntable 51 along its circumferential direction.

[0054] The leak detection device 4 includes a display table 41 for placing the product 100, a tensioning device 7 for fixing the product 100 on the display table 41, a cover body 42 with a leak detection cavity 422, an inflating device 43 for filling gas into the product 100, and a pressure sensor 44 for monitoring the pressure value of the leak detection cavity 422;

[0055] The inner cavity of the cover body 42 is provided with a filling body 421, and the filling body 421 is placed in the inner cavity of the cover body 42 to adjust the space size of the leak detection cavity 422. The pressure sensor 44 is arranged on the outer wall of the cover body 42, and the sensing end of the pressure sensor 44 extends into the leak detection cavity 422 to detect the pressure value of the leak detection cavity 422.

[0056] The cover body 42 of the leak detection device 4 is connected to the telescopic rod of the fourth cylinder 53, and the fourth cylinder 53 drives the cover body 42 to move up and down. The placement tables 41 of the leak detection device 4 are arranged at intervals on the surface of the lower turntable 52. The positions of the placement tables 41 and the cover body 42 correspond one to one, and the surface of the placement tables 41 is provided with rubber pads 411, so that multiple groups of leak detection devices 4 can be arranged on the rotating platform 5.

[0057] Corresponding to each placement table 41 , a positioning device 8 is provided for positioning the product 100 on the placement table 41 , and the positioning device 8 is electrically connected to the control device.

[0058] The positioning device 8 includes a first clamping jaw 81, a second clamping jaw 82, a first gear 83, a second gear 84 and a first cylinder 85. The first clamping jaw 81 is a hook-shaped clamping jaw. The first gear 83 and the second gear 84 are meshed. The first clamping jaw 81 is connected to the first gear 83, and the second clamping jaw 82 is connected to the second gear 84. The telescopic rod of the first cylinder 85 is connected to the first gear 83. When the first cylinder 85 is actuated, the first cylinder 85 drives the first gear 83 to rotate, and the second gear 84 rotates with the first gear 83, so that the first clamping jaw 81 and the second clamping jaw 82 are separated from each other or brought close to each other, thereby adjusting the position of the product 100.

[0059] Each placement table 41 is provided with a tensioning device 7, the tensioning device 7 comprises a pull rod 71, a hand claw 72, a second cylinder 73, a third cylinder 74 and a spring 75. The placement table 41 has an opening, the placement table 41 sits on the third cylinder 74, the second cylinder 73 and the third cylinder 74 are connected, and the second cylinder 73 controls the lifting of the third cylinder 74;

[0060] The third air cylinder 74 is provided with an air cylinder 741, one side of the air cylinder 741 is provided with an air inlet joint 742, the pull rod 71 is provided with an exhaust channel 711, one end of the pull rod 71 is provided with a support head 76, the support head 76 is provided with an exhaust port 761, and the exhaust port 761 is connected to the exhaust channel 711.

[0061] A convex hook 721 is provided on the outer wall of the hand claw 72 near its upper end. The hand claws 72 are arranged around the outer periphery of the pull rod 71 at intervals, and an elastic sleeve 77 is formed between the hand claws 72 and the hand claws 72.

[0062] The spring 75 is placed in the air cylinder 741, and the pull rod 71 passes through the opening of the display table 41 and the air cylinder 741 in turn to connect to the third air cylinder 74. A sealing ring 743 is provided at the connection between the pull rod 71 and the air cylinder 741. The third air cylinder 74 drives the pull rod 71 to rise and fall. At the same time, the spring 75 is sleeved on the pull rod 71, one end of the spring 75 abuts against the elastic sleeve 77, and the other end of the spring 75 abuts against the third air cylinder 74. The spring 75 constitutes a reset mechanism for the elastic sleeve 77.

[0063] The inflation device 43 is connected to the air inlet connector 742 of the air cylinder 741 , and the gas generated by the inflation device 43 is discharged along the air inlet connector 742 , the inner cavity of the air pump, and the exhaust channel 711 to the exhaust port 761 onto the product 100 .

[0064] The discharging conveyor belt 6 is located at the exit of the rotating platform 5, and the discharging pushing device 9 is located between the discharging conveyor belt 6 and the exit of the rotating platform 5. The discharging pushing device 9 includes a discharging swing arm, a discharging turntable and a discharging motor. The discharging swing arm is arranged on the discharging turntable at intervals along the circumferential direction of the discharging turntable. The discharging motor is connected to the discharging turntable, and the discharging motor drives the discharging turntable to rotate. The discharging swing arm moves the product 100 on the display table 41 to the discharging conveyor belt 6 to output the product 100.

[0065] A metal detector 10 is also provided at the exit of the rotating platform 5. When the cover body 42 is a metal cover body 42, if the corresponding fourth cylinder 53 fails, the cover body 42 cannot be separated from the product 100. When the product 100 moves to the discharge conveyor belt 6, the metal detector generates a signal and transmits the signal to the control device, and the control device stops the leak detector from working.

[0066] Working principle:

[0067] The user places the product 100 (such as a filter) on the feed conveyor belt 2, and the feed motor drives the feed turntable 32 to rotate. The feed push arm 311 moves the product 100 on the feed conveyor belt 2 to the display table 41. At this time, the roller 33 just enters the touch plate 35 and slides on the touch plate 35, so that the mechanical valve 313 is connected to the air source of the push arm cylinder 312, and the telescopic rod of the push arm cylinder 312 pushes the feed push arm 311 backward, so that the feed push arm 311 is away from the product 100 and blocks another product 100 to prevent the products 100 from being crowded together. When the rotating platform 5 drives the product 100 to move to another position, the roller 33 just leaves the touch plate 35, so that the mechanical valve 313 disconnects the air source of the push arm cylinder 312, and the telescopic rod of the push arm cylinder 312 contracts to drive the feed push arm 311 to reset, and so on and so forth, so that the products 100 are placed on the display table 41 in an orderly manner.

[0068] When the product 100 is placed on the display table 41, the position of the product 100 is not accurate. At this time, the first cylinder 85 and the second cylinder 73 of the positioning device 8 are actuated, and the first cylinder 85 and the second cylinder 73 drive the first clamp 81 and the second clamp 82 to move closer to each other to clamp the product 100, thereby adjusting the placement position of the product 100 and improving the accuracy of the placement of the product 100.

[0069] After the product 100 is placed in the correct position, the second cylinder 73 of the tensioning device 7 pulls the third cylinder 74 to rise. At this time, the pull rod 71 and the elastic sleeve 77 rise and expose the placement table 41. Then the third cylinder 74 pulls the pull rod 71 down. At this time, the expansion head 76 of the pull rod 71 enters the inner cavity of the elastic sleeve 77 and gradually expands the elastic sleeve 77 to make the upper diameter of the elastic sleeve 77 larger than its lower diameter. Then the third cylinder 74 continues to pull the pull rod 71 and the elastic sleeve 77 down. At this time, the elastic sleeve remains in an expanded state under the action of the spring. At this time, the claw 72 of the elastic sleeve 77 hooks the product 100, tightens and locks the product 100.

[0070] After the product 100 is tightened and locked, the fourth cylinder 53 of the rotating platform 5 drives the cover body 42 to move down and rest against the display table 41. The bottom end of the cover body 42 is tightly attached to the rubber pad 411 of the display table 41 to enhance the sealing effect. At the same time, the product 100 enters the detection cavity of the cover body 42.

[0071] Next, the gas generated by the inflation device 43 is discharged along the air inlet connector 742, the inner cavity of the air pump, and the exhaust channel 711 to the exhaust port 761 to the set test pressure on the product 100. After the set pressure stabilization time, the pressure sensor 44 collects the first test pressure P1 in the test cavity. After the set test time, the pressure sensor 44 collects the second test pressure P2 in the test cavity to obtain a pressure difference change DeltaP=P2-P1. If the product leaks, the DeltaP will be larger than normal. By reasonably setting the leakage pressure, the airtight integrity of the product 100 can be determined. If the pressure value of the test cavity changes, it means that the product 100 is leaking, and the product 100 is an unqualified product 100.

[0072] After the inspection of the product 100 is completed, the discharging swing arm of the discharging pushing device 9 moves the product 100 on the placement table 41 to the discharging conveyor belt 6 to output the product 100.

[0073] The control device is a control display screen 200, each group of leak detection devices 4 is connected to the control display screen 200, and the rotating platform 5 is numbered corresponding to the position of each group of leak detection devices 4. The pressure data of each group of leak detection devices 4 is transmitted to the control display screen 200 for user viewing. If an abnormality occurs in the pressure sensor 44 of a group of leak detection devices 4, the abnormal data will be presented on the control display screen 200, and the user can take out the unqualified product 100 with the number corresponding to the abnormality of the pressure sensor 44. The operation is very simple.

Claims

1. A leak detector for detecting the air tightness of a product, characterized in that: The machine tool comprises a feed conveyor belt for conveying products, a feed pusher device for pushing the products, a leak detection device for detecting the air tightness of the products, a discharge conveyor belt for conveying products and a control device, wherein the feed conveyor belt, the feed pusher device, the leak detection device and the discharge conveyor belt are electrically connected to the control device respectively; The leak detection device includes a display table for placing products, a tensioning device for fixing the products on the display table, a cover body with a leak detection cavity, an inflation device for inflating gas into the product, and a pressure sensor for monitoring the pressure value of the leak detection cavity; The feeding and pushing device includes a feeding swing arm for moving the product on the feeding conveyor belt to the placing table. When the product is moved to the placing table, the cover moves and sits on the placing table so that the product is placed in the leak detection cavity. Then the inflation device inflates the gas into the product. At the same time, the pressure sensor monitors the pressure value of the leak detection cavity and determines the air tightness of the product according to the pressure value. The feeding pushing device comprises at least one group of pushing components, a feeding turntable, a driving mechanism and a touch plate, each group of pushing components is arranged at intervals along the circumferential direction of the feeding turntable, each group of pushing components comprises the feeding pushing arm, the pushing arm cylinder and the mechanical valve, the pushing arm cylinder is fixed on the feeding turntable, the telescopic rod of the pushing arm cylinder is connected to the feeding pushing arm, the mechanical valve and the pushing arm cylinder are connected together and rotate with the feeding turntable, the driving mechanism is connected to the feeding turntable, the driving mechanism drives the feeding turntable to rotate, the touch plate is located on one side of the feeding turntable, and a roller is arranged at the contact piece of the mechanical valve. When the mechanical valve rotates to the touch plate position, the roller slides on the touch plate, and the roller presses the contact piece of the mechanical valve to keep the mechanical valve always in the on state, the mechanical valve starts the pushing arm cylinder, and the pushing arm cylinder pushes the feeding pushing arm to move; It also includes a discharging pushing device, which includes a discharging swing arm for moving the products on the display table to the discharging conveyor belt.

2. The leak detector for detecting the air tightness of a product according to claim 1, characterized in that: It also includes a positioning device for positioning the product on the display table, the positioning device includes a first clamp, a second clamp, a first gear, a second gear and a first cylinder, the first gear and the second gear are meshed, the first clamp is connected to the first gear, the second clamp is connected to the second gear, the telescopic rod of the first cylinder is connected to the first gear, when the first cylinder is actuated, the first cylinder drives the first gear to rotate, and the second gear rotates with the first gear, so that the first clamp and the second clamp are separated from each other or brought closer to each other, thereby adjusting the position of the product.

3. The leak detector for detecting the air tightness of a product according to claim 1, characterized in that: The surface of the placing table is provided with a rubber pad.

4. The leak detector for detecting the air tightness of a product according to claim 1, characterized in that: The tensioning device includes a pull rod, a hand claw, a second cylinder, a third cylinder and a spring. The placing table has an opening, the placing table sits on the third cylinder, the second cylinder and the third cylinder are connected, and the second cylinder controls the lifting of the third cylinder. One end of the pull rod is provided with a support head, and the other end of the pull rod passes through the opening of the display table to connect to the third cylinder, and the third cylinder drives the pull rod to rise and fall, and the claws are arranged around the outer periphery of the pull rod at intervals, and an elastic sleeve is formed between the claws; The spring is sleeved on the pull rod, one end of the spring abuts against the elastic sleeve, and the other end of the spring abuts against the third cylinder, and the spring constitutes a reset mechanism of the elastic sleeve; When the second cylinder drives the third cylinder to rise, the elastic sleeve and the pull rod rise and expose the display table. When the third cylinder drives the pull rod to descend, the expansion head enters the inner cavity of the elastic sleeve and gradually expands the elastic sleeve so that the upper diameter of the elastic sleeve is larger than its lower diameter.

5. The leak detector for detecting the air tightness of a product according to claim 4, characterized in that: The third cylinder is provided with an air cylinder, one side of the air cylinder is provided with an air inlet joint, the expansion head is provided with an exhaust port, the pull rod is provided with an exhaust channel, the pull rod passes through the air cylinder to connect to the third cylinder, the inlet of the exhaust channel is connected to the inner cavity of the air cylinder, and the outlet of the exhaust channel is connected to the exhaust port.

6. The leak detector for detecting the air tightness of a product according to claim 4, characterized in that: A convex hook is arranged on the outer wall of the hand claw near the upper end thereof.

7. The leak detector for detecting air tightness of a product according to any one of claims 1 to 6, characterized in that: It also includes a rotating platform, which includes an upper turntable, a lower turntable and a fourth cylinder. A working area is formed between the upper turntable and the lower turntable. The fourth cylinder is arranged at intervals at the bottom of the upper turntable. The telescopic rod of the fourth cylinder is connected to the cover body. The fourth cylinder drives the cover body to move up and down. The placing table is arranged at intervals on the surface of the lower turntable, and the position of the placing table corresponds to the position of the cover body one by one.

8. The leak detector for detecting the air tightness of a product according to claim 1, characterized in that: It also includes a filling body, which is placed in the inner cavity of the cover to adjust the space size of the leak detection cavity.

9. The leak detector for detecting the air tightness of a product according to claim 1, characterized in that: The discharging pushing device also includes a discharging turntable and a discharging motor. The discharging swing arms are arranged on the discharging turntable at intervals along the circumferential direction of the discharging turntable. The discharging motor is connected to the discharging turntable, and the discharging motor drives the discharging turntable to rotate.

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