Food packaging bag air leakage detection equipment

Abstract

The invention discloses food packaging bag air leakage detection equipment, and relates to the technical field of food packaging bags, the food packaging bag air leakage detection equipment comprises a sealing frame, a first flange is fixedly connected to the outer side edge of the sealing frame close to the rear side, a connecting frame is attached to the rear side of the sealing frame, and a second flange is fixedly connected to the outer side edge of the connecting frame close to the front side; the first flange and the second flange are arranged in a mutually attached mode, the device can be used in a handheld mode and can also be used vertically on the ground through mutual cooperation of the bridle, the L-shaped supporting plate, the threaded rod, the limiting plate and other structures, when the device is used in the handheld mode, the bridle is arranged on the wrist in a sleeving mode, the sealing frame is held by the hand, and then detection work can be started; when the device is used as an independent device, the sealing frame is placed between the two L-shaped supporting plates, the threaded rod is aligned with the threaded cylinder, the threaded rod is rotated to rotate into the threaded cylinder, and then the sealing frame can be preliminarily limited in cooperation with the limiting plate and the elastic plate.

Description

Technical Field

[0001] This invention relates to the field of food packaging bag technology, specifically to a food packaging bag leakage detection device. Background Technology

[0002] Food packaging is an integral part of food products and one of the main processes in the food industry. It protects food from damage caused by biological, chemical, and physical external factors during its distribution from the factory to the consumer. Leakage detection equipment is needed to inspect the packaging bags in food packaging.

[0003] However, existing food packaging bag leakage detection equipment has some problems in use. The existing leakage detection equipment is often fixed in place, which is inconvenient for hand-held operation, reducing the applicability of the device. At the same time, it is not convenient to conduct batch testing of food packaging bags, which will reduce the detection efficiency of the device. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a food packaging bag leakage detection device.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a food packaging bag leakage detection device, comprising a sealing frame, a first flange fixedly connected to the outer edge of the sealing frame near the rear side, a connecting frame fitted to the rear side of the sealing frame, and a second flange fixedly connected to the outer edge of the connecting frame near the front side. The first flange and the second flange are fitted together. Each of the first flange and the second flange has four threaded holes, and a bolt is threaded into two adjacent threaded holes. Two elastic rods are fixedly connected to the bottom of the sealing frame near the rear side, and one end of the elastic rod away from the sealing frame is fixedly connected to the bottom of the connecting frame. An electric rotating column is provided in the inner cavity of the connecting frame near the front side, and the left and right ends of the electric rotating column are inserted into the side wall of the inner cavity of the connecting frame. Several rotating plates are fixedly connected to the outer edge of the electric rotating column.

[0006] Preferably, a through hole is provided at the center of the front side of the sealing frame, and a Y-shaped rod is inserted through the through hole. The rear end of the Y-shaped rod extends into the inner cavity of the sealing frame. A piston plate is fixedly connected to the rear end of the Y-shaped rod. The outer edge of the piston plate is fitted to the side wall of the inner cavity of the sealing frame. A connecting hole is provided at the center of the piston plate. A rotary vane vacuum pump is fixedly connected at the center of the front side of the piston plate. The rotary vane vacuum pump and the connecting hole are interconnected. Pressure sensors are fixedly connected to the rear side of the piston plate near the left and right sides.

[0007] Preferably, a slot is provided on the rear side of the connecting frame, and two arc-shaped grooves are provided in the slot. Semicircular grooves are provided on both the left and right sides of the inner cavity of the connecting frame. A movable arc plate is provided in the slot and the two arc-shaped grooves. Three electric rollers are fixedly connected to the left and right sides of the movable arc plate. The three electric rollers on the same side are located in adjacent semicircular grooves.

[0008] Preferably, a connecting plate is provided at the top of the sealing frame near the front side. Two through slots are provided on the connecting plate, and a strap runs through both through slots. Adjusting plates are fixedly connected to both the front and rear sides of the connecting plate. The side of the adjusting plate away from the connecting plate is fixedly connected to the top of the sealing frame, and the side of the strap away from the connecting plate is fixedly connected to the top of the sealing frame.

[0009] Preferably, a connecting plate is fixedly connected to the front end of the Y-shaped rod, and a spring is sleeved on the outer edge of the Y-shaped rod near the front side. The front end of the spring is fixedly connected to the rear side of the connecting plate, and the rear end of the spring is fixedly connected to the front side of the sealing frame.

[0010] Preferably, threaded cylinders are fixedly connected to both the left and right sides of the sealing frame, and L-shaped support plates are provided on both the left and right sides of the sealing frame. Limiting holes are opened near the top of the inner cavity of the L-shaped support plates, and threaded rods are passed through the limiting holes. The end of the threaded rod near the sealing frame is threadedly connected to the inner cavity of the adjacent threaded cylinder. Fixing rings are fixedly connected to the outer edge of the threaded rod near the left and right sides, and four connecting rods are fixedly connected to the side of the outer edge of the threaded rod away from the sealing frame.

[0011] Preferably, a limiting plate is provided at the center of the bottom of the sealing frame, and elastic plates are fixedly connected to the bottom of the limiting plate near the left and right sides. The side of the elastic plate away from the limiting plate is fixedly connected to the side of the adjacent L-shaped support plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This invention utilizes the interplay between a sealing frame, a rotary vane vacuum pump, a movable arc plate, and a rotating plate to allow multiple food packaging bags to be placed inside a connecting frame. Each food packaging bag is positioned between two adjacent rotating plates. An electric rotating column rotates, driving the rotating plates to rotate, which in turn rotate the food packaging bags. When a food packaging bag rotates to the piston plate side, the rotary vane vacuum pump evacuates the sealing frame and connecting frame. During this evacuation process, if air leakage occurs on the surface of the food packaging bag, a pressure sensor detects the pressure change inside the sealing frame and connecting frame. An electric roller then moves the movable arc plate, thereby sealing the connecting frame or feeding the food.

[0014] Through the cooperation of structures such as the strap, L-shaped support plate, threaded rod, and limiting plate, the device can be used both by hand and upright on the ground. When used by hand, the strap is put around the wrist, the sealing frame is held, and the testing work can begin. When used as an independent device, the sealing frame is placed between two L-shaped support plates, the threaded rod is aligned with the threaded cylinder, the threaded rod is rotated to rotate the threaded rod into the threaded cylinder, and the limiting plate and elastic plate can then initially limit the sealing frame. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention;

[0016] Figure 2 This is a bottom-view perspective view of the present invention;

[0017] Figure 3 This is a schematic diagram of the sealing frame structure of the component of the present invention;

[0018] Figure 4 This is an exploded view of the present invention;

[0019] Figure 5 This is a schematic diagram of the L-shaped support plate structure of the component of the present invention;

[0020] Figure 6 This is a top view of the threaded rod component of the present invention;

[0021] Figure 7 This is an exploded view of the sealing frame of the component of the present invention;

[0022] Figure 8 This is a schematic diagram of the component strap structure of the present invention;

[0023] Figure 9 This is a schematic diagram of the elastic rod structure of the component of the present invention;

[0024] Figure 10 This is a schematic diagram of the pressure sensor structure of the component of the present invention;

[0025] Figure 11 This is a schematic diagram of the movable arc-shaped plate structure of the component of the present invention;

[0026] Figure 12 This is a cross-sectional view of the component connection frame of the present invention;

[0027] Figure 13 This is a left sectional view of the component connection frame of the present invention;

[0028] Figure 14 This is a cross-sectional schematic diagram of the sealing frame of the component of the present invention;

[0029] Figure 15 for Figure 11 Enlarged view of point A in the middle.

[0030] The following are the labeling elements in the diagram: 1. Sealing frame; 2. Connecting frame; 3. L-shaped support plate; 4. Elastic plate; 5. Limiting plate; 6. Fixing ring; 7. Connecting rod; 8. First flange; 9. Second flange; 10. Bolt; 11. Threaded cylinder; 12. Elastic rod; 13. Rotating plate; 14. Strap; 15. Piston plate; 16. Y-shaped rod; 17. Rotary vane vacuum pump; 18. Connecting disc; 19. Spring; 20. Adjusting plate; 21. Connecting plate; 22. Pressure sensor; 23. Movable arc plate; 24. Electric roller; 25. Threaded rod; 26. Electric rotating column. Detailed Implementation

[0031] Please see Figure 1-15 The present invention provides a technical solution:

[0032] Example 1:

[0033] A food packaging bag leakage detection device includes a sealing frame 1, a first flange 8 fixedly connected to the outer edge of the sealing frame 1 near the rear side, a connecting frame 2 attached to the rear side of the sealing frame 1, a second flange 9 fixedly connected to the outer edge of the connecting frame 2 near the front side, the first flange 8 and the second flange 9 being fitted together, each of the first flange 8 and the second flange 9 having four threaded holes, with a bolt 10 threaded into two adjacent threaded holes, two elastic rods 12 fixedly connected to the bottom of the sealing frame 1 near the rear side, one end of the elastic rod 12 away from the sealing frame 1 being fixedly connected to the bottom of the connecting frame 2, an electric rotating column 26 provided in the inner cavity of the connecting frame 2 near the front side, the left and right ends of the electric rotating column 26 being inserted into the side wall of the inner cavity of the connecting frame 2, and several rotating plates 13 fixedly connected to the outer edge of the electric rotating column 26;

[0034] A through hole is provided at the center of the front side of the sealing frame 1, through which a Y-shaped rod 16 is inserted. The rear end of the Y-shaped rod 16 extends into the inner cavity of the sealing frame 1. A piston plate 15 is fixedly connected to the rear end of the Y-shaped rod 16. The outer edge of the piston plate 15 is fitted against the side wall of the inner cavity of the sealing frame 1. A connecting hole is provided at the center of the piston plate 15. A rotary vane vacuum pump 17 is fixedly connected to the center of the front side of the piston plate 15. The rotary vane vacuum pump 17 and the connecting hole are interconnected. Pressure sensors 22 are fixedly connected to the rear side of the piston plate 15 near the left and right sides. A connecting plate 18 is fixedly connected to the front end of the Y-shaped rod 16. A spring 19 is sleeved on the outer edge of the Y-shaped rod 16 near the front side. The front end of the spring 19 is fixedly connected to the rear side of the connecting plate 18, and the rear end of the spring 19 is fixedly connected to... A slot is provided on the rear side of the connecting frame 2, which is connected to the front side of the sealing frame 1. Two arc-shaped grooves are provided in the slot. Semi-circular grooves are provided on both the left and right sides of the inner cavity of the connecting frame 2. A movable arc plate 23 is provided in the slot and the two arc-shaped grooves. Three electric rollers 24 are fixedly connected to both the left and right sides of the movable arc plate 23. The three electric rollers 24 on the same side are located in adjacent semi-circular grooves. A connecting plate 21 is provided at the top of the sealing frame 1 near the front side. Two through grooves are provided on the connecting plate 21. A strap 14 is provided through both through grooves. Adjusting plates 20 are fixedly connected to both the front and rear sides of the connecting plate 21. The side of the adjusting plate 20 away from the connecting plate 21 is fixedly connected to the top of the sealing frame 1. The side of the strap 14 away from the connecting plate 21 is fixedly connected to the top of the sealing frame 1.

[0035] Multiple food packaging bags are placed inside the connecting frame 2, with each bag positioned between two adjacent rotating plates 13. The electric rotating column 26 rotates, causing the rotating plates 13 to rotate, which in turn causes the food packaging bags to rotate. When the food packaging bags rotate to the piston plate 15, the rotary vane vacuum pump 17 performs vacuuming on the sealing frame 1 and the connecting frame 2. During the vacuuming process, if air leakage occurs on the surface of the food packaging bags, the pressure sensor 22 will detect the pressure change inside the sealing frame 1 and the connecting frame 2. The electric roller 24 will then move the movable arc plate 23, thereby sealing or feeding the connecting frame 2.

[0036] Example 2:

[0037] Threaded cylinders 11 are fixedly connected to both sides of the sealing frame 1. L-shaped support plates 3 are provided on both sides of the sealing frame 1. Limiting holes are opened near the top of the inner cavity of the L-shaped support plate 3. Threaded rods 25 are passed through the limiting holes. The end of the threaded rod 25 near the sealing frame 1 is threadedly connected to the inner cavity of the adjacent threaded cylinder 11. Fixing rings 6 are fixedly connected to the outer edge of the threaded rod 25 near both sides. Four connecting rods 7 are fixedly connected to the outer edge of the threaded rod 25 away from the sealing frame 1. A limiting plate 5 is provided at the bottom center of the sealing frame 1. Elastic plates 4 are fixedly connected to the bottom of the limiting plate 5 near both sides. The side of the elastic plate 4 away from the limiting plate 5 is fixedly connected to the side of the adjacent L-shaped support plate 3.

[0038] The device can be used by hand or standing upright on the ground. When used by hand, the strap 14 is put on the wrist, and the sealing frame 1 is held to start the testing work. When used as an independent device, the sealing frame 1 is placed between the two L-shaped support plates 3, the threaded rod 25 is aligned with the threaded cylinder 11, and the threaded rod 25 is rotated into the threaded cylinder 11. With the help of the limiting plate 5 and the elastic plate 4, the sealing frame 1 can be initially limited.

[0039] Example 3:

[0040] I. Overall Structure of the Equipment

[0041] This food packaging bag leakage detection equipment mainly consists of a sealing component, a detection component, a support and adjustment component, and a batch conveying component. The specific structure of each component is as follows:

[0042] Sealing assembly: includes sealing frame 1 and connecting frame 2. A first flange 8 is fixedly connected to the outer edge of sealing frame 1 near the rear side, and a second flange 9 is fixedly connected to the outer edge of connecting frame 2 near the front side. The first flange 8 and the second flange 9 are sealed together by four bolts 10. Two elastic rods 12 are fixedly connected to the bottom of sealing frame 1 near the rear side, and the other end of the elastic rods 12 is fixedly connected to the bottom of connecting frame 2 to help improve the connection stability between sealing frame 1 and connecting frame 2.

[0043] Detection components: A through hole is opened at the center of the front side of the sealing frame 1, and a Y-shaped rod 16 is inserted through the through hole. The rear end of the Y-shaped rod 16 extends into the inner cavity of the sealing frame 1 and is fixedly connected to a piston plate 15. The outer edge of the piston plate 15 is tightly fitted to the side wall of the inner cavity of the sealing frame 1. A connecting hole is opened at the center of the piston plate 15, and a rotary vane vacuum pump 17 is fixedly connected to the center of its front side. The rotary vane vacuum pump 17 communicates with the connecting hole. Pressure sensors 22 are fixedly connected to both the left and right sides of the rear side of the piston plate 15. A connecting plate 18 is fixedly connected to the front end of the Y-shaped rod 16. A spring 19 is sleeved on the outer side of the Y-shaped rod 16 near the front side. The front end of the spring 19 is fixed to the rear side of the connecting plate 18, and the rear end is fixed to the front side of the sealing frame 1.

[0044] Support and adjustment components: Threaded cylinders 11 are fixedly connected to both the left and right sides of the sealing frame 1, and L-shaped support plates 3 are provided on both the left and right sides; a limiting hole is opened near the top of the inner cavity of the L-shaped support plate 3, and a threaded rod 25 is passed through the limiting hole. The end of the threaded rod 25 near the sealing frame 1 is threadedly connected to the inner cavity of the adjacent threaded cylinder 11; a fixing ring 6 is fixedly connected to the outer side of the threaded rod 25 near both the left and right sides, and four connecting rods 7 are fixedly connected to the side away from the sealing frame 1; a limiting plate 5 is provided at the bottom center of the sealing frame 1, and elastic plates 4 are fixedly connected to both the left and right sides of the bottom of the limiting plate 5. The other end of the elastic plate 4 is fixed to one side of the adjacent L-shaped support plate 3.

[0045] Batch conveying assembly: An electric rotating column 26 is provided near the front side of the inner cavity of the connecting frame 2. Its left and right ends are inserted into the side wall of the inner cavity of the connecting frame 2, and several rotating plates 13 are fixedly connected to the outer edge. A slot and two arc-shaped slots are opened on the rear side of the connecting frame 2. Semi-circular slots are opened on the left and right sides of the inner cavity. Movable arc plates 23 are provided in the slots and arc-shaped slots. Three electric rollers 24 are fixedly connected to the left and right sides of the movable arc plates 23. The three electric rollers 24 on the same side are located in adjacent semi-circular slots.

[0046] Handheld auxiliary component: A connecting plate 21 is provided at the top of the sealing frame 1 near the front side. Two through slots are provided on the connecting plate 21, and a strap 14 is provided through the through slots. Adjusting plates 20 are fixedly connected to both the front and rear sides of the connecting plate 21. The other end of the adjusting plate 20 is fixed to the top of the sealing frame 1, and the side of the strap 14 away from the connecting plate 21 is fixed to the top of the sealing frame 1.

[0047] II. Equipment Installation Steps

[0048] Basic assembly: Align the first flange 8 of the sealing frame 1 with the second flange 9 of the connecting frame 2, and tighten the bolts 10 by passing them through the corresponding threaded holes in sequence to complete the sealing connection between the sealing frame 1 and the connecting frame 2. At this time, the elastic rod 12 is in a natural support state.

[0049] Installation of support structure: If it is to be used as an independent device, place the two L-shaped support plates 3 on a horizontal ground so that the limiting plate 5 at the bottom of the sealing frame 1 contacts the elastic plate 4. The elastic plate 4 initially supports the sealing frame 1. Pass the threaded rod 25 through the limiting hole of the L-shaped support plate 3, rotate the connecting rod 7 to drive the threaded rod 25 to rotate, so that the end of the threaded rod 25 near the sealing frame 1 is screwed into the inner cavity of the threaded cylinder 11 until the fixing ring 6 is in contact with the L-shaped support plate 3, and the support and fixation are completed.

[0050] Functional debugging: Check the continuity of the connection hole between the rotary vane vacuum pump 17 and the piston plate 15 to ensure that the circuit connection of the pressure sensor 22 is normal; start the electric rotating column 26 and observe whether the rotating plate 13 rotates smoothly; start the electric roller 24 and check whether the movable arc plate 23 can move smoothly along the slot and arc groove to realize the switching of sealing and feeding of the connecting frame 2.

[0051] III. Equipment Usage Instructions

[0052] (I) Handheld mode usage (limited testing)

[0053] The operator puts their wrist through the strap 14 and adjusts the tightness of the strap 14 using the connecting plate 21 and the adjusting plate 20 to ensure a stable hand position; the hand holds the front of the sealing frame 1 so that the opening of the connecting frame 2 is aligned with the food packaging bag to be tested.

[0054] Push the connecting plate 18, the Y-shaped rod 16 drives the piston plate 15 to move backward, and the spring 19 is compressed; put the food packaging bag into the connecting frame 2, release the connecting plate 18, the spring 19 returns to its original position and drives the piston plate 15 to fit the food packaging bag.

[0055] The rotary vane vacuum pump 17 is started to evacuate the sealed space, and the pressure sensor 22 monitors the pressure change in real time. If the pressure is abnormal, it is determined that the packaging bag is leaking.

[0056] (II) Independent Mode Usage (Batch Detection)

[0057] Start the electric roller 24 to move the movable arc plate 23, exposing the groove on the back side of the connecting frame 2; put multiple food packaging bags into the connecting frame 2 in sequence, so that each packaging bag is located between two adjacent rotating plates 13.

[0058] The electric roller 24 is started in reverse, and the movable arc plate 23 resets the groove of the sealing connection frame 2; the electric rotating column 26 is started, which drives the rotating plate 13 and the packaging bag to rotate. When the packaging bag moves to the rear side of the piston plate 15, the rotation stops.

[0059] The rotary vane vacuum pump 17 is started to draw a vacuum, and the pressure sensor 22 detects the pressure. After the test is completed, the electric rotating column 26 continues to rotate, transporting the next set of packaging bags to the test position, and repeating the test process. If a packaging bag leaks air, the pressure sensor 22 triggers an alarm, and the leaking packaging bag can be located by rotating the position.

[0060] IV. Equipment Maintenance and Adjustment

[0061] If disassembly and maintenance are required, unscrew the bolts 10 on the first flange 8 and the second flange 9 to separate the sealing frame 1 and the connecting frame 2. The elastic rod 12 can prevent the connecting frame 2 from falling off.

[0062] Rotating the connecting rod 7 can adjust the length of the threaded rod 25 inside the threaded cylinder 11, thereby adjusting the support spacing of the L-shaped support plate 3 to adapt to different placement requirements.

[0063] The length of the strap 14 can be adjusted via the slot on the connecting plate 21 to suit the handheld needs of different operators; the elasticity of the spring 19 can be changed to different specifications according to the required detection force.

[0064] Working principle: Before the device starts working, the operator selects the mode of use. If only a small number of food packaging bags are to be leak-tested, it can be operated by hand. If a large number of food packaging bags need to be leak-tested, the device can be used as an independent device. When the device is used by hand, the operator puts the strap 14 on his wrist. The strap 14 is stretched or tightened with the connecting plate 21. The operator holds the sealing frame 1 and can then perform the leak detection work. When the device is used independently, the sealing frame 1 is placed between the two L-shaped support plates 3. The limiting plate 5 and the elastic plate 4 provide initial support for the sealing frame 1. Then, the threaded cylinder 11 is aligned with the threaded rod 25. The connecting rod 7 is rotated. The connecting rod 7 drives the threaded rod 25 and the fixing ring 6 to rotate and push the L-shaped support plate 3 until the threaded rod 25 rotates into the threaded cylinder 11, thus completing the installation of the sealing frame 1 and the two L-shaped support plates 3.

[0065] When the device starts working, the electric roller 24 is started first. The electric roller 24 extends the semi-circular groove and moves, driving the movable arc plate 23 to move, thereby exposing the slot on the connecting frame 2, allowing six food packaging bags to be placed into the connecting frame 2 simultaneously. Then, the electric roller 24 is started again, driving the movable arc plate 23 to move, which covers and seals the slot on the connecting frame 2. The food packaging bags are positioned between two adjacent rotating plates 13. The electric rotating column 26 is started, driving the rotating plate 13 to rotate, which in turn drives the food packaging bags to rotate. After some of the food packaging bags are rotated to the front of the piston plate 15, the rotary vane vacuum pump 17 is started. The rotary vane vacuum pump 17 pumps vacuum pumps into the space behind the piston plate 15. Vacuuming is performed on the rear side of the inner cavity of the sealing frame 1 and the inside of the connecting frame 2. If the rotation angle of the rotating plate 13 can block the internal space of the connecting frame 2, the vacuuming operation range is limited to the space between the piston plate 15 and the rotating plate 13. During use, the rotation angle of the rotating plate 13 can be adjusted by controlling the rotation angle of the electric rotating column 26. If the food packaging bag leaks during vacuuming, the pressure inside the cavity will change. The pressure sensor 22 will detect and sense the leak, thus identifying the leak in the food packaging bag. The position of the piston plate 15 can be adjusted, pulling the connecting plate 18. The connecting plate 18 drives the Y-shaped rod 16 to move, and the Y-shaped rod 16 drives the spring 19 to stretch, which in turn drives the piston plate 15 to move.

[0066] After finishing the work, if it is necessary to maintain the parts of the device, turn the bolt 10 and remove the bolt 10 from the inside of the first flange 8 and the second flange 9. Separate the sealing frame 1 and the connecting frame 2. The connecting frame 2 is connected to the sealing frame 1 through the elastic rod 12, which facilitates the installation of the connecting frame 2.

Claims

1. A food packaging bag leakage detection device, comprising a sealing frame (1), characterized in that: A first flange (8) is fixedly connected to the outer edge of the sealing frame (1) near the rear side. A connecting frame (2) is attached to the rear side of the sealing frame (1). A second flange (9) is fixedly connected to the outer edge of the connecting frame (2) near the front side. The first flange (8) and the second flange (9) are fitted together. Four threaded holes are opened on the first flange (8) and the second flange (9). A bolt (10) is threaded into two adjacent threaded holes. Two elastic rods (12) are fixedly connected to the bottom of the sealing frame (1) near the rear side. One end of the elastic rod (12) away from the sealing frame (1) is fixedly connected to the bottom of the connecting frame (2). An electric rotating column (26) is provided in the inner cavity of the connecting frame (2) near the front side. The left and right ends of the electric rotating column (26) are inserted into the side wall of the inner cavity of the connecting frame (2). Several rotating plates (13) are fixedly connected to the outer edge of the electric rotating column (26).

2. The food packaging bag leakage detection device according to claim 1, characterized in that: A through hole is provided at the center of the front side of the sealing frame (1), and a Y-shaped rod (16) is provided through the through hole. The rear end of the Y-shaped rod (16) extends into the inner cavity of the sealing frame (1). A piston plate (15) is fixedly connected to the rear end of the Y-shaped rod (16). The outer edge of the piston plate (15) is fitted to the inner wall of the sealing frame (1). A connecting hole is provided at the center of the piston plate (15). A rotary vane vacuum pump (17) is fixedly connected at the center of the front side of the piston plate (15). The rotary vane vacuum pump (17) and the connecting hole are interconnected. Pressure sensors (22) are fixedly connected to the rear side of the piston plate (15) near the left and right sides.

3. The food packaging bag leakage detection device according to claim 1, characterized in that: The connecting frame (2) has a slot on the rear side, and two arc-shaped grooves are opened in the slot. Semicircular grooves are opened on both the left and right sides of the inner cavity of the connecting frame (2). A movable arc plate (23) is provided in the slot and the two arc-shaped grooves. Three electric rollers (24) are fixedly connected to both the left and right sides of the movable arc plate (23). The three electric rollers (24) on the same side are located in adjacent semicircular grooves.

4. The food packaging bag leakage detection device according to claim 1, characterized in that: The sealing frame (1) has a connecting plate (21) near the front side at the top. The connecting plate (21) has two through slots, and a strap (14) runs through both slots. Adjusting plates (20) are fixedly connected to both the front and rear sides of the connecting plate (21). The side of the adjusting plate (20) away from the connecting plate (21) is fixedly connected to the top of the sealing frame (1), and the side of the strap (14) away from the connecting plate (21) is fixedly connected to the top of the sealing frame (1).

5. The food packaging bag leakage detection device according to claim 2, characterized in that: The Y-shaped rod (16) is fixedly connected to a connecting plate (18) at its front end. A spring (19) is sleeved on the outer edge of the Y-shaped rod (16) near the front side. The front end of the spring (19) is fixedly connected to the rear side of the connecting plate (18), and the rear end of the spring (19) is fixedly connected to the front side of the sealing frame (1).

6. The food packaging bag leakage detection device according to claim 1, characterized in that: The sealing frame (1) is fixedly connected to threaded cylinders (11) on both the left and right sides. The sealing frame (1) is provided with L-shaped support plates (3) on both the left and right sides. The inner cavity of the L-shaped support plate (3) is provided with a limiting hole near the top. The limiting hole is provided with a threaded rod (25). The end of the threaded rod (25) near the sealing frame (1) is threaded to the inner cavity of the adjacent threaded cylinder (11). The outer edge of the threaded rod (25) is fixedly connected to the left and right sides with a fixing ring (6). The outer edge of the threaded rod (25) away from the sealing frame (1) is fixedly connected to four connecting rods (7).

7. The food packaging bag leakage detection device according to claim 6, characterized in that: The sealing frame (1) has a limiting plate (5) at the bottom center. The bottom of the limiting plate (5) is fixedly connected to the left and right sides with elastic plates (4). The side of the elastic plate (4) away from the limiting plate (5) is fixedly connected to the side of the adjacent L-shaped support plate (3).

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