Can lid pull tab detection device and detection method

Abstract

The present invention discloses a can lid pull tab detection device and a detection method, which belongs to the field of packaging detection. The can lid pull tab detection device of the present invention comprises a sealing device, a fixing device, a pressurizer and an opening device; the sealing device is used to cooperate with the can lid to form a pressurized chamber, and the sealing device is provided with an air inlet; the fixing device is used to fix and pressurize the can lid to the detection station; the pressurizer is connected to the air inlet to pressurize the pressurized chamber; the opening device is used to pull the pull ring on the can lid to open the pull tab; the detection device can simulate the situation that when the internal pressure of the can packaging increases, the consumer pulls the pull ring to open the pull tab, so as to realize the sampling inspection of the can lid, monitor whether the pull ring and / or the pull tab will fly off when pulled, so as to detect the connection reliability between the can lid pull tab and the can lid body under the action of internal pressure; the detection method of the present invention comprises the steps of fixing, sealing, pressurizing, opening and judging the can lid; the detection method can judge whether the can lid is a qualified product.

Description

Technical Field

[0001] The invention relates to the field of packaging detection, and in particular to a can lid pull tab detection device and a detection method. Background Art

[0002] At present, cans are widely used as packaging for beer, beverages, etc. Cans include a can body and a can cover. The can cover includes a cover body, a pull ring, a pull tab, score lines and rivets. The pull tab is connected to the cover body through the score lines. When consumers need to drink the liquid in the can, they pull the pull ring to separate the pull tab from the cover body at the score lines.

[0003] However, since cans are generally used to fill beer and carbonated beverages, and are affected by transportation or temperature, the pressure inside the can is likely to increase. When the pressure inside the can increases, when the consumer pulls the pull ring, the pull ring and / or pull tab may fly off due to the internal pressure; when the pull tab flies up, it may easily cut the consumer's eyes; when the pull ring flies up, it may easily cause the connection between the pull ring and the pull tab to become detached, resulting in the inability to smoothly pull the pull tab.

[0004] There is no suitable detection equipment in the prior art that can be used to simulate and detect whether pulling the pull ring will easily cause the pull ring and / or pull tab to fly off when the pressure in the can body increases; there is also no suitable detection method for detecting whether the pull ring and pull tab on the can cover are set up properly. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a can lid pull tab detection device, which can be used to detect whether the pull ring and pull tab are easy to fly off during the opening process of the can lid under the action of internal pressure.

[0006] A second object of the present invention is to provide a can cover pull tab detection method, which can determine whether the can cover is qualified through detection.

[0007] One of the purposes of the present invention is achieved by the following technical solution:

[0008] A can cover pull tab detection device comprises a fixing device, a sealing device, a pressurizer and an opening device; the fixing device is used to fix and press the can cover to a detection station; the sealing device is used to cooperate with the can cover to form a pressurized cavity, and the sealing device is provided with an air inlet; the pressurizer is connected to the air inlet to pressurize the pressurized cavity; the opening device is used to pull the pull ring on the can cover to open the pull tab on the can cover.

[0009] Furthermore, it also includes a pressure sensor and a controller; the pressure sensor is used to sense the air pressure in the pressurizing chamber and send the air pressure value to the controller; the controller is used to receive the signal sent by the pressure sensor, and send an instruction to the pressurizer to continue pressurizing or stop pressurizing based on the received air pressure value; the pressurizer is suitable for pressurizing or stopping pressurizing based on the instruction issued by the pressurizer.

[0010] Furthermore, it also includes a frame; the opening device includes a hook arm, a pulling device and a pushing device;

[0011] One end of the hook arm is provided with a hook portion for hooking the pull ring, and the other end is hinged to the pulling device; the pulling device is suitable for pulling the hook arm so that the hook arm moves away from the can cover at an angle inclined relative to the can cover;

[0012] The pulling device is hinged to the frame, and the pushing device is used to push the pulling device so that the pulling device rotates around the frame, thereby causing the hook to drive the pull ring to move or rotate away from the can cover to open the pull tab on the can cover.

[0013] Furthermore, the pulling device comprises a telescopic cylinder and a connecting piece, wherein the telescopic cylinder body is hinged to the frame; one end of the connecting piece is hinged to the hook arm, and the other end is fixedly connected to the telescopic rod of the telescopic cylinder.

[0014] Furthermore, the pushing device is a pushing cylinder, the pushing cylinder body is fixed to the frame, and the telescopic rod of the pushing cylinder is used to push the connecting piece along a direction parallel to the surface of the tank cover.

[0015] Furthermore, it also includes a frame; the sealing device includes a sealing seat with a groove and a sealing gasket arranged on the sealing seat; the fixing device includes a pressure cover; when inspection is required, the pressure cover and the sealing gasket press the tank cover tightly to fix the tank cover to the inspection station and form a pressurized chamber between the tank cover and the groove.

[0016] Furthermore, the fixing device further comprises a capping cylinder, an upper pressing plate fixedly connected to the capping cylinder, and a connecting column fixedly connected to the upper pressing plate, wherein the capping is fixedly connected to the other end of the connecting column; one end of the capping cylinder away from the upper pressing plate is fixedly connected to the frame;

[0017] There is a gap between the upper pressing plate and the pressing cover, and the gap is used to provide an installation working space for the opening device.

[0018] Furthermore, it also includes a frame and a discharge device connected to the frame; the discharge device is used to push the tank cover from the front side of the tank cover to move the tank cover away from the opening device.

[0019] The second object of the present invention is achieved by adopting the following technical solution:

[0020] A can lid pull tab detection method, comprising the steps of: fixing and pressing the can lid to a detection station by using a fixing device;

[0021] Sealing step: using the sealing device to cooperate with the can cover to form a pressurized cavity between the back of the can cover and the sealing device;

[0022] Pressurizing step: pressurizing the pressurizing chamber by using a pressurizing channel provided on the sealing device;

[0023] Opening steps: After pressurizing the pressurizing chamber, use the opening device to hook and pull the pull ring on the front of the can cover, and pull the pull tab on the can cover in the direction away from the can cover body;

[0024] Observation steps: when the pull ring is pulled by the opening device, monitor whether the pull ring and / or the pull tab are flying off due to the pressure in the pressurized chamber;

[0025] Judgment step: In the observation step, if the can cover is found to be flying off, the can cover is classified as a defective product; if the can cover is not found to be flying off, the can cover is classified as a qualified product.

[0026] Further, the fixing step and the sealing step are performed simultaneously;

[0027] The pressure setting step is further included, wherein the pressure setting step is: presetting a pressure value in the controller;

[0028] The pressurizing step further includes: when the pressurizing device applies pressure to the pressure chamber, the pressure in the pressurizing chamber is monitored by a pressure sensor, and when the actual pressure value in the pressurizing chamber reaches a preset pressure value, the pressurizing device stops pressurizing;

[0029] The opening step further comprises: when the actual pressure value in the pressurized chamber is the same as the preset pressure value, pulling the pull ring using the opening device.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The can lid pull tab detection device can cooperate with the can lid to form a pressurized chamber by setting a sealing device; and then the can lid can be fixed at the detection station by cooperating with the sealing device through a fixing device; on this basis, the pull ring can be pulled in cooperation with the opening device to simulate the opening of the pull tab by hand; through the above settings, it can simulate the situation that when the internal pressure of the can package is relatively large, the consumer pulls the pull ring to open the pull tab; it can realize the sampling inspection of the can lid, monitor whether the pull ring and / or pull tab will fly off when being pulled due to the internal pressure, so as to detect the connection reliability of the can lid pull ring, pull tab and can lid body under the action of internal pressure;

[0032] (2) The can lid pull tab detection method can determine whether the can lid is a qualified product by coordinating the fixing step, the sealing step, the pressurizing step, the opening step and the observation step. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the can lid pull tab detection device of the present invention;

[0034] Figure 2 It is a cross-sectional structural diagram of the can lid pull tab detection device of the present invention (the pushing device is not shown);

[0035] Figure 3 for Figure 2 A magnified view of part A;

[0036] Figure 4 It is another structural schematic diagram of the can lid pull tab detection device of the present invention (the sealing device is not shown);

[0037] In the figure: 10, sealing device; 11, sealing seat; 111, groove; 112, mounting groove; 12, sealing gasket; 20, fixing device; 21, pressure cover; 22, pressure cover cylinder; 23, upper pressure plate; 24, connecting column; 30, opening device; 31, hook arm; 311, hook part; 32, pulling device; 321, telescopic cylinder; 322, connecting piece; 33, pushing device; 40, unloading device; 70, frame; 80, pressurizing chamber; 90, tank cover. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0039] Embodiment 1:

[0040] like Figure 1-4As shown, the first embodiment provides a can lid pull tab detection device, including a fixing device 20, a sealing device 10, a pressurizer (not shown) and an opening device 30; the fixing device 20 is used to fix and press the can lid 90 to the detection station; the sealing device 10 is used to cooperate with the can lid 90 to be detected to form a pressurized chamber 80, and the sealing device 10 is provided with an air inlet; the pressurizer is connected to the air inlet to pressurize the pressurized chamber 80; the opening device 30 is used to pull the pull ring on the can lid 90 to open the pull tab on the can lid 90, so that the score line between the pull tab and the body of the can lid 90 is cracked, and the pressurized chamber 80 is connected to the external atmosphere through the crack. In some embodiments, the pressurizer is connected to the pressurized chamber 80 through a pressurized pipeline, and the pressurizer is an electric air pump.

[0041] The method of using the testing equipment is as follows:

[0042] The can cover 90 is fixed and pressed on the inspection station by using the fixing device 20, and the sealing device 10 is used to cooperate with the can cover 90 to form a pressurized chamber 80 between the back side of the can cover 90 and the sealing device 10; the pressurized chamber 80 is pressurized by using the pressurized channel provided on the sealing device 10; after pressurizing the pressurized chamber 80, the opening device 30 is used to hook and pull the pull ring on the front side of the can cover 90, and pull the pull tab on the can cover 90 in the direction of separating from the can cover 90 body; when the opening device 30 pulls the pull ring, monitor whether the pull ring and / or pull tab are flying off due to the pressure in the pressurized chamber 80; in the observation step, if flying off occurs, the can cover 90 is classified as a defective product; if flying off does not occur, the can cover 90 is classified as a qualified product.

[0043] The can lid pull-tab detection equipment, by providing a fixing device 20 to cooperate with the sealing device 10, can ensure that when the pressure in the pressurized chamber 80 increases, or when the opening device 30 pulls the pull ring, the can lid 90 can be fixed and pressed at the detection station to simulate the fixed connection between the can lid 90 and the can body; by cooperating with the sealing device 10 and the can lid 90, the situation of increased air pressure inside the can body of the can can be simulated; by pulling the pull ring on the can lid 90 by the opening device 30, the situation when the consumer pulls the pull ring can be simulated; through the simulation combination of the above three situations, the situation when the air pressure inside the can increases and the consumer pulls the pull ring can be simulated, and whether the pull tab and / or pull ring will fly off can be detected, so as to evaluate whether the pull ring on the can lid 90 and the connection between the pull tab and the lid body itself meet the standards, so as to evaluate whether the can lid 90 is qualified and safe. On the other hand, by selecting the can lid 90 as the test sample to cooperate with the fixing device 20, the sealing device 10, the pressurizer and the opening device 30, the opening safety of the pull ring and the pull tab under the condition of internal pressure is tested. Compared with directly selecting the finished cans containing beverages for testing, it is more convenient and avoids the situation that when the finished cans with increased internal pressure are opened directly for testing, the liquid in the can is sprayed out, which pollutes the equipment and is difficult to clean.

[0044] Preferably, the can lid pull tab detection device further includes a pressure sensor and a controller; the pressure sensor is used to sense the air pressure in the pressurizing chamber 80 and send the air pressure value to the controller; the controller is used to receive the signal sent by the pressure sensor and send a command to the pressurizer to continue pressurizing or stop pressurizing according to the received air pressure value; the pressurizer is suitable for pressurizing or stopping pressurizing according to the command sent by the pressurizer. The pressure sensor can be arranged in the pressurizing chamber 80, in the pressurizing pipe or on the pressurizer.

[0045] On the basis of the above scheme, when the opening device 30 is provided with a driving device to realize the action of pulling the pull ring, the pressure sensor, the controller and the opening device 30 are coordinated, and the controller is used to analyze the air pressure in the pressurized chamber 80. When the air pressure in the pressurized chamber 80 drops suddenly, a stop opening instruction is sent to the opening device 30 to close the opening driving device so that when the pull tab is pulled open a little so that the pressurized chamber 80 is connected with the outside, the opening driving device is closed to complete the opening action.

[0046] Preferably, in order to better simulate the action of pulling the pull ring by hand and better open the pull tab, the pulling part of the opening device 30 used to connect the pull ring to apply pulling force needs to form a certain angle with the surface of the can cover 90, such as 20 degrees to 70 degrees, so as to facilitate the use of the opening device 30 to pull the pull tab; the can cover 90 pull tab inspection equipment of this embodiment also includes a frame 70 for fixing the relative positions of various components; the opening device 30 includes a hook arm 31 for hooking the pull ring, a pulling device 32 inclined relative to the surface of the can cover 90 to provide oblique pulling force, and an assisting pushing device 33 for assisting the pulling device 32 to pull the pull ring to open the pull tab.

[0047] Specifically, Figure 2 , 3 As shown in Figure 4, one end of the hook arm 31 is provided with a hook portion 311 for hooking the pull ring, and the other end is hinged to the pulling device 32; the pulling device 32 has a pulling portion arranged obliquely relative to the can cover 90, and the pulling portion is suitable for pulling the hook arm 31 so that the hook arm 31 moves in a direction away from the can cover 90 at an angle inclined relative to the can cover 90; the pulling device 32 is hinged to the frame 70, and the pushing device 33 is used to push the pulling device 32 so that the pulling device 32 rotates around the frame 70, thereby causing the hook portion 311 to drive the pull ring to move in a direction away from the can cover 90, so as to pull open the pull tab on the can cover 90.

[0048] In this embodiment, the sealing device 10 has a horizontal placement area, and the fixing device 20 is used to fix the can cover 90 horizontally, so that it is convenient for a person or a robot to place the can cover 90 in the placement area or take it out; and the pulling device 32 is inclined at 20 degrees to 70 degrees to achieve pulling the pull ring at an inclined angle. In addition, the other end of the telescopic cylinder 321 body is hinged to the frame 70.

[0049] Preferably, the pulling device 32 includes a telescopic cylinder 321 and a connecting member 322. The telescopic cylinder 321 includes a body and a telescopic rod. The body of the telescopic cylinder 321 is hinged to the frame 70. One end of the connecting member 322 is hinged to the hook arm 31, and the other end is fixedly connected to the telescopic rod of the telescopic cylinder 321. The pushing device 33 is a pushing cylinder. The pushing cylinder body is fixed to the frame 70. The telescopic rod of the pushing cylinder is used to push the connecting member 322 in a direction parallel to the surface of the tank cover 90. Since the telescopic cylinder 321 is installed behind the hinge axis of the connecting member 322 and the hook arm 31, the telescopic cylinder 321 only applies a pulling force during the process of pulling the pull ring, and does not generate a horizontal or vertical force on the tank cover 90.

[0050] Preferably, the hook portion 311 is configured as a 90-degree bending structure.

[0051] Based on the above structure, the working principle of the opening device 30 in this embodiment is as follows:

[0052] The telescopic cylinder 321 is started, the telescopic rod is retracted, and the hook arm 31 is pulled to move along the inclined angle, and the hook portion 311 moves in the horizontal direction, and the hook portion 311 is inserted into the gap between the pull ring and the tank cover 90 body. At the same time, the hook portion 311 is also lifted in the vertical direction to hook up the pull ring; the telescopic cylinder 321 can be used to pull the pull ring around the rivet on the tank cover 90 to rotate a certain angle; and because one end of the pull ring is hinged to the tank cover 90, the other end is rotatably connected to the hook portion 311, and the hook arm 31 is also connected to the tank cover 90. One end is hinged to the connecting piece 322, and the connecting piece 322 is fixedly connected to the telescopic cylinder 321. The telescopic cylinder 321 is hinged to the frame 70. When the pull ring rotates a certain angle, the cylinder is pushed to work and push the connecting piece 322 in the horizontal direction, which is equivalent to pushing a rod body in a connecting rod system (connecting piece 322 + telescopic cylinder 321), which can drive the hook arm 31 and then drive the pull ring to rise, so as to realize the use of the pushing cylinder to pull the pull ring upwards and complete the opening of the pull piece.

[0053] The advantages of the above-mentioned opening device 30 are: through the operation of the pulling device 32, it can simulate the action of first rotating the pull ring to a certain angle when a person holds the pull ring to open the pull tab; and then through the operation of the pushing device 33, it simulates the action of lifting the pull ring upward after rotating the pull ring so that the score line at the connection between the pull ring and the can cover 90 body is cracked; through the combination of the two, the action of pulling the pull ring is scientifically reproduced, so as to obtain the detection result of the reliability of the pull ring.

[0054] Preferably, in order to ensure that the hook portion 311 of the hook arm 31 always hooks the pull ring downward, a counterweight is hung at the rear of the hook arm 31 .

[0055] It should be noted that when to start or stop the telescopic cylinder 321, when to start or stop the push cylinder, the art can set time nodes according to actual needs and conditions; at the same time, those skilled in the art can manually start or stop the telescopic cylinder 321 and the push cylinder, or connect the telescopic cylinder 321 and the push cylinder to a controller and control the switches of the two by using the preset value of the controller. How to use the controller to control the telescopic cylinder 321 and the push cylinder is a conventional technology in the art and will not be described here.

[0056] In some other embodiments, the fixing device 20 and the sealing device 10 may be placed at an angle, while the opening device 30 is placed horizontally.

[0057] In some other embodiments, the opening device 30 includes a hook 311, a connecting rope, and a pulley arranged above the fixing device 20, so that the hook 311 is manually connected to the pull ring, one end of the connecting rope is connected to the hook 311, and the other end passes around the pulley and is connected to the pulling device 32, so as to continuously pull the hook 311 up, and the pull ring and pull tab can also be opened.

[0058] In some other embodiments, the opening device 30 only includes the pulling device 32 but does not include the pushing device 33 .

[0059] Preferably, the sealing device 10 includes a sealing seat 11 with a groove 111, and a sealing gasket 12 disposed on the sealing seat 11; the fixing device 20 includes a pressure cap 21; when testing is required, the pressure cap 21 presses the tank cover 90 against the sealing gasket 12 to fix and press the tank cover 90 at the testing station, and a pressurized chamber 80 is formed between the tank cover 90 and the groove 111. By providing the groove 111 on the sealing seat 11, the pressurized chamber 80 can be formed in cooperation with the tank cover 90; by providing the sealing gasket 12, the sealing effect can be improved and the detection error can be reduced; by cooperating with the pressure cap 21 and the sealing device 10, the tank cover 90 can be clamped from two directions, effectively preventing the tank cover 90 from bouncing up due to pressure when re-pressurization occurs.

[0060] Preferably, in order to match the tank cover 90, the sealing seat 11 is a cylindrical sealing seat 11. In order to make the connection between the sealing gasket 12 and the sealing seat 11 more stable, a mounting groove 112 is provided on the sealing seat 11 to place the sealing gasket 12 into the mounting groove 112. In some other embodiments, the sealing gasket 12 and the sealing seat 11 can be fixed by adhesive bonding.

[0061] On the basis of the above scheme, when the can cover 90 is placed on the sealing gasket 12, the pressing cover 21 and the sealing seat 11 are pressed and fixed by the mutual approach between them. The pressing cover 21 can be pressed down by the driving mechanism, or the sealing seat 11 can be driven up by the driving mechanism, or they can move toward each other at the same time. Technical personnel in this field can set it according to actual needs.

[0062] Preferably, the can lid pull tab detection equipment also includes a calibration component, which includes a sealed calibration plug placed on the sealing seat 11, a calibration pressure device is connected to the self-sealing calibration interface, the calibration plug is pressed against the sealing seat 11 by a program-controlled cylinder, air is ventilated into the pipeline, and the calibration purpose is achieved by comparing the pressure sensor value with an external precision calibration pressure device. The sealed calibration joint adopts a spring-type self-locking structure, which is ventilated by pushing open the marble after inserting the tube inward, and after the tube is pulled out, the spring pushes the spring back to the sealing position to cut off the air path.

[0063] Preferably, the sealing seat 11 in this embodiment is fixedly connected to the frame 70, and the can cover 90 is clamped and fixed by pressing down the pressure cover 21; specifically, the fixing device 20 also includes a pressure cover cylinder 22, an upper pressure plate 23 fixedly connected to the pressure cover cylinder 22, and a connecting column 24 fixedly connected to the upper pressure plate 23, and the pressure cover 21 is fixedly connected to the other end of the connecting column 24; one end of the pressure cover cylinder 22 away from the upper pressure plate 23 is fixedly connected to the frame 70; there is a gap between the upper pressure plate 23 and the pressure cover 21, and the gap is used to provide an installation working space for the opening device 30, so that the operation of the opening device 30 does not conflict with the fixing work of the pressure cover 21.

[0064] Preferably, in order to allow the opening device 30 to be disconnected from the pull ring after the pull tab is pulled open by the opening device 30, so as to facilitate the removal of the tested can lid 90, the can lid pull tab detection device further includes a discharge device 40 connected to the frame 70; the discharge device 40 is used to push the can lid 90 from the front of the can lid 90 to move the can lid 90 away from the opening device 30, so as to avoid the opening device 30 hooking away the entire can lid 90 when the pull tab is not disconnected from the can lid 90 body, which is inconvenient for recovering the can lid 90 and for the next detection. The discharge device 40 in this embodiment is a discharge cylinder.

[0065] Preferably, the test of sample can lids 90 of different diameters is achieved by replacing the sealing seat 11 and the pressure cover 21. The sealing seat 11 can be directly taken out by hand, and the pressure cover 21 is tightened by a positioning groove and a magnet, so the replacement of the fixture is very convenient and quick.

[0066] Embodiment 2:

[0067] The present embodiment provides a can lid pull-tab detection method, including a fixing step: using a fixing device 20 to fix and press the can lid 90 to a detection station; a sealing step: using a sealing device 10 to cooperate with the can lid 90 to form a pressurized chamber 80 between the back of the can lid 90 and the sealing device 10; a pressurizing step: using a pressurized channel provided on the sealing device 10 to pressurize the pressurized chamber 80; an opening step: after pressurizing the pressurized chamber 80, using an opening device 30 to hook and pull the pull ring on the front of the can lid 90, and pull the pull tab on the can lid 90 in a direction away from the can lid 90 body; an observation step: when the opening device 30 pulls the pull ring, monitoring whether the pull ring and / or the pull tab are caused to fly off by the pressure in the pressurized chamber 80; a judgment step: in the observation step, if the pull-off occurs, the can lid 90 is classified as a defective product; if the pull-off does not occur, the can lid 90 is classified as a qualified product.

[0068] Preferably, the fixing step and the sealing step are performed simultaneously; the step of presetting pressure is also included, and the step of presetting pressure value is as follows: the pressure value is preset in the controller; the pressurizing step also includes: when the pressurizing device pressurizes the pressure chamber, the pressure in the pressurizing chamber 80 is monitored by a pressure sensor, and when the actual pressure value in the pressurizing chamber 80 reaches the preset pressure value, the pressurizing device stops pressurizing; the opening step also includes: when the actual pressure value in the pressurizing chamber 80 is the same as the preset pressure value, the pull ring is pulled by the opening device 30.

[0069] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A can lid pull tab detection device, which is used to detect whether the pull ring and pull tab of the can lid are easy to fly off during the opening process under the condition of internal pressure; it is characterized by: It includes a sealing device, a fixing device, a pressurizer and an opening device; The sealing device is used to cooperate with the can cover to form a pressurized chamber, and the sealing device is provided with an air inlet; the fixing device is used to fix and press the can cover to the detection station; the pressurizer is connected to the air inlet to pressurize the pressurized chamber; the opening device is used to pull the pull ring on the can cover to open the pull tab on the can cover; It also includes a pressure sensor and a controller; the pressure sensor is used to sense the air pressure in the pressurization chamber and send the air pressure value to the controller; the controller is used to receive the signal sent by the pressure sensor, and according to the received air pressure value, send an instruction to the pressurizer to continue pressurizing or stop pressurizing, and the pressurizer is suitable for pressurizing or stopping pressurizing according to the instruction issued by the controller; and when the air pressure in the pressurization chamber drops suddenly, the controller sends a stop opening instruction to the opening device, and the opening device is suitable for stopping opening according to the instruction issued by the controller.

2. The can lid pull tab detection device according to claim 1, characterized in that: It also includes a frame; the opening device includes a hook arm, a pulling device and a pushing device; One end of the hook arm is provided with a hook portion for hooking the pull ring, and the other end is hinged to the pulling device; the pulling device is used to pull the hook arm so that the hook arm moves away from the can cover at an angle inclined relative to the can cover; The pulling device is hinged to the frame, and the pushing device is used to push the pulling device so that the pulling device rotates around the frame, thereby causing the hook to drive the pull ring to move or rotate away from the can cover to open the pull tab on the can cover.

3. The can lid pull tab detection device according to claim 2, characterized in that: The pulling device comprises a telescopic cylinder and a connecting piece, wherein the main body of the telescopic cylinder is hinged to the frame; one end of the connecting piece is hinged to the hook arm, and the other end is fixedly connected to the telescopic rod of the telescopic cylinder.

4. The can lid pull tab detection device according to claim 3, characterized in that: The pushing device is a pushing cylinder, the pushing cylinder body is fixedly arranged on the frame, and the telescopic rod of the pushing cylinder is used to push the connecting piece along a direction parallel to the surface of the tank cover.

5. The can lid pull tab detection device according to claim 1, characterized in that: It also includes a frame; the sealing device includes a sealing seat with a groove and a sealing gasket arranged on the sealing seat; the fixing device includes a pressure cover; when inspection is required, the pressure cover and the sealing gasket press the tank cover tightly to fix the tank cover to the inspection station and form a pressurized chamber between the tank cover and the groove.

6. The can lid pull tab detection device according to claim 5, characterized in that: The fixing device also includes a capping cylinder, an upper pressing plate fixedly connected to the capping cylinder, and a connecting column fixedly connected to the upper pressing plate, wherein the capping is fixedly connected to the other end of the connecting column; one end of the capping cylinder away from the upper pressing plate is fixedly connected to the frame; There is a gap between the upper pressing plate and the pressing cover, and the gap is used to provide an installation working space for the opening device.

7. The can lid pull tab detection device according to claim 1, characterized in that: It also includes a frame and a discharge device connected to the frame; the discharge device is used to push the can cover from the front side of the can cover to move the can cover away from the opening device.

8. A can lid pull tab detection method, which is used to detect whether the pull ring and pull tab are easy to fly off during the opening process of the can lid under the condition of internal pressure; characterized by: include: Fixing step: fix and press the can cover to the inspection station by using a fixing device; Sealing step: using the sealing device to cooperate with the can cover to form a pressurized cavity between the back of the can cover and the sealing device; Pressurizing step: pressurizing the pressurizing chamber by using a pressurizing channel provided on the sealing device; Opening steps: after pressurizing the pressurized chamber, use the opening device to hook and pull the pull ring on the front of the can cover, pull the pull tab on the can cover in the direction of separating from the can cover body, use the pressure sensor to sense the air pressure in the pressurized chamber, and send the air pressure value to the controller, the controller is used to analyze the air pressure in the pressurized chamber, when the air pressure in the pressurized chamber drops suddenly, the controller sends a stop opening instruction to the opening device, so that when the pull tab is pulled open a little to make the pressurized chamber connected with the outside, the opening device is closed to complete the opening action; Observation steps: when the pull ring is pulled by the opening device, monitor whether the pull ring and / or the pull tab are flying off due to the pressure in the pressurized chamber; Judgment step: In the observation step, if the can cover is found to be flying off, the can cover is classified as a defective product; if the can cover is not found to be flying off, the can cover is classified as a qualified product.

9. The can lid pull tab detection method according to claim 8, characterized in that: The fixing step and the sealing step are performed simultaneously; The pressure setting step is further included, wherein the pressure setting step is: presetting a pressure value in the controller; The pressurizing step further includes: when the pressurizing device applies pressure to the pressure chamber, the pressure sensor is used to monitor the pressure in the pressurizing chamber, and when the actual pressure value in the pressurizing chamber reaches a preset pressure value, the pressurizing device stops pressurizing; The opening step further comprises: when the actual pressure value in the pressurized chamber is the same as the preset pressure value, pulling the pull ring using the opening device.

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