A leak detection device for aluminum foil sealed cans

Abstract

A leak detection device for an aluminum foil sealed can comprises an upper turntable and a lower turntable. Seats are evenly arranged on the outer circumference of the upper turntable. A guide rail is arranged below the lower turntable. The guide rail is circular and has a high position section on the left side. A lifting shaft is passed through the circumference of the upper turntable and the lower turntable. A shoulder is provided at the lower end of the lifting shaft. A compression spring is sleeved on the lifting shaft and is located between the lower turntable and the shoulder. A roller is installed at the bottom of the lifting shaft. A lifting plate is fixed at the upper end of the lifting shaft. A pressure block is fixed at the end of the lifting plate. An air hole is processed in the middle of the pressure block. An elastic block is fixed at the lower part of the pressure block. A vacuum tube is fixed in the middle of the lifting plate. The upper part of the vacuum tube is connected with a vacuum shut-off valve. A composite vacuum gauge is installed on the vacuum tube. A connecting pipe connects the air hole with the vacuum tube. An electromagnetic valve is arranged on the connecting pipe. The leak detection device provided by the invention is ingeniously designed. It detects the change of vacuum degree in the vacuum tube by negative pressure. It has high detection efficiency and high detection accuracy. It realizes online detection and is very suitable for actual production of enterprises.

Description

Technical Field

[0001] The invention relates to a leakage detection device for an aluminium foil sealed can. Background Art

[0002] Aluminum foil sealed cans are widely used in the field of food and medicine packaging due to their beautiful appearance, convenience of use, and good sealing quality. my country's current sealing machine technology has reached the international level. Correspondingly, the development of automated filling, capping, and sealing lines is also relatively mature. After the aluminum foil is sealed, whether the sealed can is sealed has a great impact on the shelf life of the items in the can. The existing online real-time detection device for aluminum foil sealed cans generally emits electromagnetic waves to the sealed can body, and judges whether the aluminum foil of the sealed can is sealed according to the intensity of the received electromagnetic waves, such as a real-time detection and automatic rejection device for aluminum foil sealing disclosed in the invention with application number 201621106085.2. In addition, the sealing of the aluminum foil sealed cans sealed by hot melt is detected by manual sampling. Manual inspection by sampling is destructive to the product, and it is impossible to quickly find the aluminum foil sealing defects online and remove them in time. The use of electromagnetic waves to detect the sealing of the sealed can is rarely used in actual production of enterprises due to the high cost of the detection equipment and problems such as repair and maintenance. Summary of the invention

[0003] In view of the shortcomings existing in the above problems, the present invention provides a leakage detection device for aluminum foil sealed cans.

[0004] To achieve the above-mentioned purpose, the present invention provides a leakage detection device for an aluminum foil sealed can, comprising an upper turntable and a lower turntable that are fixedly connected, seats are evenly arranged on the outer circumference of the upper turntable, a guide rail is arranged below the lower turntable, the guide rail is circular and has a high-position section on the left side, a lifting shaft is arranged on the circumference of the upper turntable and the lower turntable, a shoulder is arranged at the lower end of the lifting shaft, a compression spring is sleeved on the lifting shaft and is located between the lower turntable and the shoulder, a roller is installed at the bottom of the lifting shaft and makes a circular motion on the guide rail, a lifting plate is fixed on the upper end of the lifting shaft, a pressure block is fixed on the outer end of the lifting plate, an air hole is processed in the middle of the pressure block, an elastic block is fixed at the lower part of the pressure block, the pressure block and the elastic block together form an inner cavity, a vacuum tube is fixed at the middle part of the lifting plate, the upper part of the vacuum tube is connected to the vacuum cut-off valve, a composite vacuum gauge is installed on the vacuum tube, a connecting pipe connects the air hole with the vacuum tube, and an electromagnetic valve is arranged on the connecting pipe;

[0005] First, evacuate the vacuum tube to form a negative pressure environment, and use the compound vacuum gauge to measure the vacuum degree in the vacuum tube for the first time. Then, the aluminum foil sealing can is embedded in the inner cavity, and the solenoid valve is activated to connect the inner cavity with the vacuum tube. The vacuum degree in the vacuum tube is measured again through the compound vacuum tube. By comparing the vacuum degrees on both sides, it is determined whether the seal of the aluminum foil sealing can meets the requirements.

[0006] Preferably, the upper turntable and the lower turntable are fixedly connected by a plurality of connecting frames evenly distributed on the circumference, and the height of the connecting frames is adjustable;

[0007] In the above technical solution, multiple connecting frames make the connection between the upper turntable and the lower turntable stable, and the device can be adapted to aluminum foil sealing cans of different heights by adjusting the height of the connecting frames, thus achieving good versatility.

[0008] Preferably, the length of the high section is greater than the distance between two adjacent workstations on the upper turntable, and the lower turntable is connected to the cam divider via a flange;

[0009] In the above technical solution, the high-position section needs to meet the feeding and discharging process of the aluminum foil sealed cans, so it needs a length of at least two stations, and the device is driven by a cam divider to operate intermittently.

[0010] Preferably, the vacuum cut-off valve comprises a valve seat and a valve stem moving relative to the valve seat, one end of the valve seat is connected to the vacuum tube, and the other end of the valve seat is connected to a vacuum pumping device;

[0011] In the above technical solution, the vacuum tube is evacuated by the vacuum pumping equipment, and the vacuum cut-off valve plays the role of on-off control.

[0012] Preferably, the solenoid valve is installed close to the air hole;

[0013] In the above technical solution, the device is installed near the air hole. When the aluminum foil sealed can is embedded in the inner cavity, there is no air on the path of the pipe, and the detection accuracy of the device is high.

[0014] Preferably, the elastic block has an elastic surface that can be squeezed and deformed, and the elastic surface is spherical before being compressed;

[0015] In the above technical solution, airtightness is achieved by deforming the elastic surface to fit the surface of the aluminum foil sealing can.

[0016] The beneficial effects of the present invention compared to the prior art are as follows: the prior art uses electromagnetic wave inspection or manual sampling, while the present invention provides a leak detection device with ingenious design. It detects the change of vacuum degree in the vacuum tube through negative pressure, has high detection efficiency and high detection accuracy, realizes online detection, and is very suitable for the actual production of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of a leak detection device for an aluminum foil sealed can of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of position A in the middle (the roller is in the high section);

[0019] Figure 3 This is a schematic diagram of the roller in the low position.

[0020] In the figure: 1. upper turntable; 2. connecting frame; 3. lower turntable; 4. compression spring; 5. lifting shaft; 51. shaft shoulder; 6. roller; 7. guide rail; 71. high section; 8. seat; 9. aluminum foil sealing can; 10. elastic block; 101. elastic surface; 11. inner cavity; 12. pressure block; 121. air hole; 13. lifting plate; 14. solenoid valve; 15. connecting pipe; 16. vacuum shut-off valve; 161. valve seat; 162. valve stem; 17. vacuum tube; 18. compound vacuum gauge. DETAILED DESCRIPTION

[0021] like Figures 1 to 3 As shown, a leak detection device for an aluminum foil sealed can according to an embodiment of the present invention comprises an upper turntable 1 and a lower turntable 3 that are fixedly connected. Seats 8 are evenly arranged on the outer circumference of the upper turntable 1. A guide rail 7 is arranged below the lower turntable 3. The guide rail 7 is circular and has a high section 71 on the left side. A lifting shaft 5 is passed through the circumference of the upper turntable 1 and the lower turntable 3. The lower end of the lifting shaft 5 has a shoulder 51. A compression spring 4 is sleeved on the lifting shaft 5 and is located between the lower turntable 3 and the shoulder 51. A roller 6 is installed at the bottom of the lifting shaft 5 and moves in a circle on the guide rail 7. A lifting plate 13 is fixed to the upper end of the lifting shaft 5. A pressing block 12 is fixed to the outer end of the lifting plate 13. An air hole 121 is processed in the middle of the pressing block 12. An elastic block 10 is fixed to the lower part of the pressing block 12. The pressing block 12 and the elastic block 10 together form an inner cavity 11. A vacuum tube 17 is fixed to the middle part of the lifting plate 13. The upper part of the empty pipe 17 is connected to the vacuum shut-off valve 16, and a composite vacuum gauge 18 is installed on the vacuum pipe 17. The connecting pipe 15 connects the air hole 121 with the vacuum pipe 17, and a solenoid valve 14 is provided on the connecting pipe 15; wherein, the upper turntable 1 and the lower turntable 3 are fixedly connected by a plurality of connecting frames 2 evenly distributed on the circumference, and the height of the connecting frames 2 is adjustable; the length of the high-position section 71 is greater than the distance between two adjacent stations on the upper turntable 1, and the lower turntable 3 is connected to the cam divider through a flange; the vacuum shut-off valve 16 includes a valve seat 161 and a valve stem 162 moving relative to the valve seat 161, one end of the valve seat 161 is connected to the vacuum pipe 17, and the other end of the valve seat 161 is connected to a vacuum pumping device; the solenoid valve 14 is installed near the air hole 121; the elastic block 10 has an elastic surface 101 that can be squeezed and deformed, and the elastic surface 101 is spherical before being compressed.

[0022] The prior art uses electromagnetic wave inspection or manual sampling. The present invention provides a leak detection device with ingenious design. It detects the change of vacuum degree in the vacuum tube through negative pressure. It has high detection efficiency and high detection accuracy, realizes online detection, and is very suitable for the actual production of enterprises.

[0023] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0024] See also Figure 1 The workstations corresponding to the upper turntable and the high-position section at least include a feeding position and a discharging position, where the aluminum foil sealed cans are fed and discharged. In the high-position section, the solenoid valve cuts off the gas flow channel, the vacuum cut-off valve opens the gas flow channel, the vacuum equipment evacuates the vacuum tube and then closes the gas flow channel, and the vacuum degree a1 in the vacuum tube is recorded by the composite vacuum gauge. The aluminum foil sealed can after feeding rotates with the upper turntable. When the roller leaves the high-position section, the compression spring releases the elastic potential energy so that the lifting plate moves downward along the lifting shaft, and the upper part of the aluminum foil sealed can is embedded in the inner cavity 11 (see Figure 2 , Figure 3 ), at the same time, all the air in the inner cavity is squeezed out, the elastic block undergoes elastic deformation, and the elastic surface fits with the surface of the aluminum foil sealed can to achieve sealing. After that, the solenoid valve operates to open the gas flow channel and record the vacuum degree a2 in the vacuum tube again; if the air tightness of the aluminum foil seal is good, a1 and a2 are not much different. If the air tightness of the aluminum foil seal is poor, the air in the aluminum foil sealed can is successively transferred from the air hole and the pipe to the vacuum tube and the air pressure balance is achieved again, and the vacuum degree a2 measured subsequently will have a large deviation from a1. When the deviation data reaches a certain level, it is determined that the aluminum foil seal is leaking. In this way, leak detection of the aluminum foil sealed can is achieved.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A leak detection device for aluminum foil sealed cans, comprising an upper rotating disk (1) and a lower rotating disk (3) which are fixedly connected, characterized in that: Seats (8) are evenly arranged on the outer circumference of the upper turntable (1), a guide rail (7) is arranged below the lower turntable (3), the guide rail (7) is circular and has a high section (71) on the left side, a lifting shaft (5) is arranged on the circumference of the upper turntable (1) and the lower turntable (3), the lower end of the lifting shaft (5) has a shoulder (51), a compression spring (4) is sleeved on the lifting shaft (5) and is located between the lower turntable (3) and the shoulder (51), a roller (6) is installed at the bottom of the lifting shaft (5) and moves in a circle on the guide rail (7), a lifting plate (13) is fixed on the upper end of the lifting shaft (5), and the A pressure block (12) is fixed at the outer end of the lifting plate (13), an air hole (121) is processed in the middle of the pressure block (12), an elastic block (10) is fixed at the lower part of the pressure block (12), and the pressure block (12) and the elastic block (10) together form an inner cavity (11), a vacuum tube (17) is fixed at the middle part of the lifting plate (13), the upper part of the vacuum tube (17) is connected to a vacuum shut-off valve (16), and a composite vacuum gauge (18) is installed on the vacuum tube (17), a connecting pipe (15) connects the air hole (121) with the vacuum tube (17), and a solenoid valve (14) is provided on the connecting pipe (15).

2. The leak detection device for an aluminum foil sealed can according to claim 1, characterized in that: The upper turntable (1) and the lower turntable (3) are fixedly connected via a plurality of connection frames (2) evenly distributed on the circumference, and the height of the connection frames (2) is adjustable.

3. The leak detection device for an aluminum foil sealed can according to claim 1, characterized in that: The length of the high section (71) is greater than the distance between two adjacent workstations on the upper turntable (1), and the lower turntable (3) is connected to the cam divider via a flange.

4. The leak detection device for an aluminum foil sealed can according to claim 1, characterized in that: The vacuum shutoff valve (16) comprises a valve seat (161) and a valve stem (162) that moves relative to the valve seat (161); one end of the valve seat (161) is connected to the vacuum tube (17); and the other end of the valve seat (161) is connected to a vacuum pumping device.

5. The leak detection device for an aluminum foil sealed can according to claim 1, characterized in that: The solenoid valve (14) is installed close to the air hole (121).

6. The leak detection device for an aluminum foil sealed can according to claim 1, characterized in that: The elastic block (10) has an elastic surface (101) that can be squeezed and deformed, and the elastic surface (101) is spherical before being compressed.

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