Packaging bag sealing performance detection device and detection method

Abstract

The invention provides a device and method for detecting the sealing performance of a packaging bag, and belongs to the technical field of packaging bag detection.The device and method for detecting the sealing performance of the packaging bag are provided with a workbench, a bottom plate is fixedly installed on the workbench, the right end of the bottom plate is rotationally connected with a U-shaped frame, and two suction cups A are fixedly installed on a transverse rod on the U-shaped frame; a straight frame is arranged on the workbench, and suction cups B are fixedly installed at the two ends of the straight frame. An opening and closing mechanism is arranged on the right side of the straight frame, the opening and closing mechanism comprises two straight plates which rotate relatively, two suction cups C are fixedly installed below the straight plate on the left side, two suction cups C are fixedly installed above the straight plate on the right side, and openings of the suction cups C on the two sides are oppositely arranged; an air pump sliding vertically is arranged above the straight plate, and an air outlet pipe extending downwards is arranged on the air pump; the packaging bag detection device is used for solving the technical problem that the packaging bags are usually in a tiled mode, and when multiple packaging bags are detected, the packaging bags are inconvenient to be located at the air outlet pipe.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging bag detection, and in particular, relates to a packaging bag sealing performance detection device and a packaging bag sealing performance detection method. Background Art

[0002] Packaging bags refer to bags used to pack various items, which make it easy to transport and store goods during production and circulation. They are widely used in daily life and industrial production. Before packaging bags are put on the market, they need to be tested for sealing to prevent them from breaking during use. The existing testing method is usually to blow air into the packaging bag. The utility model with application number: CN202223390798.4 (publication number: CN219608624U) relates to a PE bag blowing detection device, including a support frame, a cylinder is fixedly connected to the center above the support frame, the output end of the cylinder is fixedly connected to a pressing plate, both ends of the pressing plate are connected to a clamping device, a support is provided on one side above the clamping device, a sealing plate is provided at the bottom of the clamping device, one side of the sealing plate is in contact with the packaging bag, a plurality of air outlet pipes are connected to the inside of the packaging bag, and the upper part of the air outlet pipes is connected to the main air pipe; The packaging bags are usually laid flat. When the above patent is used, the opening of the packaging bag is first wrapped outside the air outlet pipe. When multiple packaging bags are tested, it is not convenient to place the packaging bag at the air outlet pipe, and manual operation will increase the risk of accidental damage to the packaging bag. Summary of the invention

[0003] The object of the present invention is to provide a packaging bag sealing performance detection device and detection method, which is used to solve the technical problem that packaging bags are usually laid flat, and when multiple packaging bags are tested, it is not convenient to locate the packaging bags at the air outlet pipe.

[0004] The present invention is achieved in that: The present invention provides a sealing performance testing device for packaging bags, comprising a workbench, wherein a bottom plate for placing packaging bags is fixedly installed on the left side of the workbench, a U-shaped frame is rotatably connected to the right end of the bottom plate, and two suction cups A fixedly installed on a cross bar are symmetrically arranged between two vertical bars of the U-shaped frame; The workbench is provided with a flat frame which is laterally slidably connected to the right side of the bottom plate, and suction cups B are fixedly installed at both ends of the flat frame, and an opening and closing mechanism is provided on the right side of the flat frame; The opening and closing mechanism comprises two relatively rotating flat plates, two suction cups C are fixedly installed below the left flat plate, and two suction cups C are fixedly installed above the right flat plate, and the openings of the suction cups C on both sides are arranged oppositely; A plurality of plug-in slots are provided on the right wall of the flat plate on the right side, and a plurality of plug-in boards adapted to the plug-in slots are fixedly installed on the left wall of the flat plate on the left side; A vertically sliding air pump is provided above the flat plate, and the air pump has an air outlet pipe extending downward, and an air pressure sensor is fixedly installed on the top of the air outlet pipe. Semicircular through grooves are opened in the middle of the opposite sides of the flat plate, and the two through grooves are used to clamp the air outlet pipe.

[0005] On the basis of the above technical solution, the sealing performance detection device of a packaging bag of the present invention can also be improved as follows: Furthermore, two longitudinally distributed support rods B are fixedly installed on both sides of the bottom plate on the workbench, and a horizontal plate B extending to the right is fixedly installed on each of the support rods B, and a movable plate is slidably connected to the two horizontal plates B; The fixed end of the lifting cylinder B is fixedly mounted on the movable plate, and the movable end of the lifting cylinder B extends downward, and the end is fixedly connected to the middle of the straight frame.

[0006] Furthermore, a rotating seat is fixedly installed on the right end of the horizontal plate B at the rear end, and a driving motor B is fixedly installed on the left end of the horizontal plate B at the rear end. The output shaft of the driving motor B extends to the right and is connected to one end of the screw through a coupling. The other end of the screw is rotatably connected to the rotating seat, and a screw block is sleeved on the outer peripheral surface of the screw and is threadedly connected to it.

[0007] Further, the bottom surface of the screw block is in contact with the top surface of the horizontal plate B, and the top surface of the screw block is fixedly connected with the bottom surface of the rear end of the movable plate; A slider is fixedly mounted on the bottom surface of the front end of the movable plate. The slider is slidably connected to a slide rail, and the slide rail is fixedly mounted on the transverse plate B at the front end.

[0008] Furthermore, gears are fixedly mounted on the rear ends of the flat plates, and a rack that moves longitudinally is meshed and connected between the two gears; A support rod C is fixedly installed on the right side of the transverse plate B, and a transverse plate C fixedly connected to the transverse plate B is fixedly installed on the support rod C. The gears are all rotatably connected to the transverse plate C.

[0009] Furthermore, an extension plate is fixedly installed at the rear end of the horizontal plate C, and the fixed end of the telescopic cylinder C is fixedly installed on the extension plate. The movable end of the telescopic cylinder C extends backward, and the end is fixedly connected to the rack through a connecting plate C, and the connecting plate C is slidably connected in the sliding groove of the extension plate.

[0010] Furthermore, the fixed end of the lifting cylinder D is fixedly installed in the middle of the rear horizontal plate C, the movable end of the lifting cylinder D extends upward, and the rear end of the connecting plate D is fixedly installed at the end, and the front end of the connecting plate D is fixedly connected to the top of the air pump.

[0011] Furthermore, two longitudinally arranged bearing seats are rotatably mounted on the right side of the bottom plate, and a rotating shaft is rotatably connected to each of the bearing seats through a bearing, and the U-shaped frame is fixedly mounted on the opposite side of the rotating shaft; A driving motor A is disposed on the bottom plate, and an output shaft of the driving motor A is connected to the rotating shaft on the front side via a coupling.

[0012] Furthermore, a vertically arranged baffle is fixedly installed on the right side of the bottom plate, and the baffle limits the rotation angle of the U-shaped frame.

[0013] The present invention provides a method for detecting the sealing performance of a packaging bag, which comprises the following steps: S1: Place the packaging bag to be tested on the bottom plate; S2: The U-shaped frame is rotated to fit one side of the packaging bag through the suction cup A, so that the suction cup A absorbs the packaging bag, and then the U-shaped frame is reset to a vertical state; S3: Move the straight frame downward to fit the other side of the packaging bag through the suction cup B, so that the suction cup B adsorbs the packaging bag, cancels the adsorption of the packaging bag by the suction cup A, and rotates the U-shaped frame to contact the packaging bag on the bottom plate, so that the straight frame is reset to the highest end; S4; the flat frame drives the bag to move right between the two flat plates, so that the two flat plates are close to each other and fit with both sides of the bag through the suction cup C, so that the suction cup C adsorbs the bag, cancels the suction cup B on the bag, and resets the flat frame to the leftmost end; S5: Move the two flat plates away from each other to open the packaging bag through the suction cup C, and move the air pump downward until the air outlet pipe extends into the packaging bag; S6: move the two flat plates closer to each other until the plug-in plate is inserted into the plug-in slot to seal the bag opening, and allow the air pump to inflate the bag through the air outlet pipe; S7: The air pressure is detected by the air pressure sensor. If the air pressure is stable, it means that the food packaging bag is not damaged. If the air pressure is unstable, it means that the food packaging bag is damaged.

[0014] Compared with the prior art, the packaging bag sealing performance detection device and detection method provided by the present invention have the following beneficial effects: The device uses a U-shaped frame to take the packaging bag, a flat frame to transfer the packaging bag, and a flat plate to open and seal the packaging bag, all without manual operation, thus avoiding manual operation errors that may cause the packaging bag to break. The U-shaped frame and the flat frame facilitate the movement of the flat packaging bag to the detection position; the packaging bag is transported by the suction cups A, B and C in sequence; The sealed packaging bag is inflated through an air pump and an air outlet pipe, and the air pressure is detected by an air pressure sensor. Stable and gentle air pressure indicates that the food packaging bag is not damaged, and unstable air pressure indicates that the food packaging bag is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is an axonometric diagram of a sealing performance testing device for a packaging bag; Figure 2 It is a front view of a sealing performance testing device for a packaging bag; Figure 3 A top view of a sealing performance testing device for a packaging bag; Figure 4 It is an overall axonometric diagram of an opening and closing mechanism of a sealing performance testing device for a packaging bag; Figure 5 This is an axonometric diagram of a U-shaped frame in a vertical state of a sealing performance testing device for packaging bags; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Workbench; 11. Bottom plate; 12. Baffle; 2. U-shaped frame; 20. Suction cup A; 21. Bearing seat; 22. Rotating shaft; 23. Drive motor A; 3. Straight frame; 30. Suction cup B; 31. Support rod B; 32. Horizontal plate B; 33. Moving plate; 34. Lifting cylinder B; 35. Rotating seat; 36. Drive motor B; 37. Screw; 38. Screw block; 39. Slider; 391. Slide rail; 4. Straight plate; 40. Suction cup C; 41. Gear; 42. Rack; 43. Support rod C; 44. Horizontal plate C; 45. Extension plate; 46. Connecting plate C; 47. Telescopic cylinder C; 51. Through slot; 52. Plug-in slot; 53. Plug-in plate; 6. Air pump; 61. Exhaust pipe; 62. Air pressure sensor; 63. Lifting cylinder D; 64. Connecting plate D. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. Example 1

[0022] like Figure 1-5 As shown, the present invention provides a sealing performance testing device for packaging bags, comprising a workbench 1, wherein a bottom plate 11 for placing packaging bags is fixedly installed on the left side of the workbench 1, a U-shaped frame 2 is rotatably connected to the right end of the bottom plate 11, and two suction cups A20 fixedly installed on the crossbar are symmetrically arranged between two vertical bars of the U-shaped frame 2; The workbench 1 is provided with a flat frame 3 which is laterally slidably connected to the right side of the bottom plate 11, and suction cups B30 are fixedly installed at both ends of the flat frame 3. An opening and closing mechanism is provided on the right side of the flat frame 3; The opening and closing mechanism includes two relatively rotating flat plates 4, two suction cups C40 are fixedly installed below the left flat plate 4, and two suction cups C40 are fixedly installed above the right flat plate 4, and the openings of the suction cups C40 on both sides are arranged oppositely; A plurality of plug-in slots 52 are provided on the right wall of the right flat plate 4, and a plurality of plug-in plates 53 matching the plug-in slots 52 are fixedly mounted on the left wall of the left flat plate 4; A vertically sliding air pump 6 is provided above the flat plate 4, and the air pump 6 has an air outlet pipe 61 extending downward, and an air pressure sensor 62 is fixedly installed on the top of the air outlet pipe 61. Semicircular through grooves 51 are opened in the middle of the opposite sides of the flat plate 4, and the two through grooves 51 are used to clamp the air outlet pipe 61.

[0023] Optionally, in the above technical solution, two longitudinally distributed support rods B31 are fixedly installed on both sides of the bottom plate 11 on the workbench 1, and a horizontal plate B32 extending to the right is fixedly installed on each support rod B31, and a movable plate 33 is slidably connected to the two horizontal plates B32; The fixed end of the lifting cylinder B34 is fixedly mounted on the movable plate 33 , and the movable end of the lifting cylinder B34 extends downward, and the end is fixedly connected to the middle of the straight frame 3 .

[0024] Optionally, in the above technical solution, a rotating seat 35 is fixedly installed on the right end of the rear end horizontal plate B32, and a driving motor B36 is fixedly installed on the left end of the rear end horizontal plate B32. The output shaft of the driving motor B36 extends to the right and is connected to one end of a screw 37 through a coupling. The other end of the screw 37 is rotatably connected in the rotating seat 35, and a screw block 38 is threadedly connected to the screw 37 on the outer peripheral surface.

[0025] Optionally, in the above technical solution, the bottom surface of the screw block 38 abuts against the top surface of the horizontal plate B32, and the top surface of the screw block 38 is fixedly connected to the bottom surface of the rear end of the moving plate 33; A slider 39 is fixedly mounted on the bottom surface of the front end of the movable plate 33 . The slider 39 is slidably connected to a slide rail 391 . The slide rail 391 is fixedly mounted on the transverse plate B32 at the front end.

[0026] Optionally, in the above technical solution, a gear 41 is fixedly installed at the rear end of the flat plate 4, and a rack 42 that moves longitudinally is meshed and connected between the two gears 41; A support rod C43 is fixedly installed on the right side of the transverse plate B32, and a transverse plate C44 fixedly connected to the transverse plate B32 is fixedly installed on the support rod C43, and the gears 41 are rotatably connected to the transverse plate C44.

[0027] Optionally, in the above technical solution, an extension plate 45 is fixedly installed at the rear end of the horizontal plate C44, and the fixed end of the telescopic cylinder C47 is fixedly installed on the extension plate 45. The movable end of the telescopic cylinder C47 extends backward, and the end is fixedly connected to the rack 42 through a connecting plate C46, ​​and the connecting plate C46 is slidably connected in the slide groove of the extension plate 45.

[0028] Optionally, in the above technical solution, the fixed end of the lifting cylinder D63 is fixedly installed in the middle part of the rear horizontal plate C44, the movable end of the lifting cylinder D63 extends upward, and the rear end of the connecting plate D64 is fixedly installed at the end, and the front end of the connecting plate D64 is fixedly connected to the top of the air pump 6.

[0029] Optionally, in the above technical solution, two longitudinally arranged bearing seats 21 are rotatably installed on the right side of the bottom plate 11, and a rotating shaft 22 is rotatably connected to the bearing seats 21 through bearings, and a U-shaped frame 2 is fixedly installed on the opposite side of the rotating shaft 22; A driving motor A23 is disposed on the bottom plate 11 , and an output shaft of the driving motor A23 is connected to the rotating shaft 22 on the front side via a coupling.

[0030] Optionally, in the above technical solution, a vertically arranged baffle plate 12 is fixedly installed on the right side of the bottom plate 11 , and the baffle plate 12 limits the rotation angle of the U-shaped frame 2 .

[0031] The present invention provides a method for detecting a sealing performance detection device of a packaging bag, which comprises the following steps: S1: Place the packaging bag to be tested on the bottom plate 11; S2: The U-shaped frame 2 is rotated to fit one side of the packaging bag through the suction cup A20, so that the suction cup A20 absorbs the packaging bag, and then the U-shaped frame 2 is reset to a vertical state; S3: Move the flat frame 3 downward to fit the other side of the packaging bag through the suction cup B30, so that the suction cup B30 absorbs the packaging bag, cancels the absorption of the packaging bag by the suction cup A20, rotates the U-shaped frame 2 to contact the packaging bag on the bottom plate 11, and resets the flat frame 3 to the highest end; S4; the straight frame 3 drives the bag to move right between the two straight plates 4, so that the two straight plates 4 are close to each other and fit with both sides of the bag through the suction cup C40, so that the suction cup C40 adsorbs the bag, cancels the suction cup B30 adsorbs the bag, and the straight frame 3 is reset to the leftmost end; S5: Move the two flat plates 4 away from each other to open the packaging bag through the suction cup C40, and move the air pump 6 downward until the air outlet pipe 61 extends into the packaging bag; S6: The two flat plates 4 are brought closer to each other until the plug-in plate 53 is inserted into the plug-in groove 52 to seal the bag opening, and the air pump 6 inflates the bag through the air outlet pipe 61; S7: Detect the air pressure through the air pressure sensor 62. If the air pressure is stable, it means that the food packaging bag is not damaged. If the air pressure is unstable, it means that the food packaging bag is damaged.

[0032] Preferably, the packaging bag type of the present invention is Figure 1-2 The flat bag shown in the figure is rectangular, and the bag opening is located at its short side.

[0033] Among them, the U-shaped frame 2 is in a vertical state (such as Figure 5 ), the suction cup A20 and the suction cup B30 are staggered on the vertical axis; when the suction cup B30 is at the highest end, it is at the same height as the suction cup C40 on the right; the suction cup C40 on the right corresponds to the suction cup A20 in the vertical state on the horizontal axis; the above arrangement ensures that the suction cups will not be correspondingly adsorbed on the same part of the packaging bag; Furthermore, one end of an air pipe is fixedly provided on the suction cup (the air pipe is connected to the suction cup), and the other end of the air pipe is externally connected to an air pump (preferably a vacuum pump) to provide suction for the suction cup.

[0034] The lengths of the plug slot 52 and the plug plate 53 are both greater than the length of the bag opening, and a sealing strip is provided in the plug slot 52, so that after the plug plate 53 and the bag opening of the bag are inserted into the plug slot 52, the bag can be sealed, which is convenient for subsequent inflation detection; The inner walls of the through grooves 51 are each provided with a sealing strip, and the circular shape formed by the two through grooves 51 is adapted to the size of the air outlet pipe 61 and can clamp the air outlet pipe 61 .

[0035] Among them, the air pressure sensor 62 is a commonly used device in the prior art, and the model used can be customized according to actual use requirements. The air pressure sensor 62 can be replaced with an air flow meter with the same function to detect the air flow and air pressure value supplied to the inside of the packaging bag.

[0036] Working principle: In the initial state, the U-shaped frame 2 is in a vertical state, the flat frame 3 is at the highest point, the two flat plates 4 are unfolded at the maximum angle, and the packaging bag to be inspected is placed on the bottom plate 11; When in use, the U-shaped frame 2 is rotated counterclockwise, a packaging bag is sucked by the suction cup A20, and the driving motor A23 is started to drive the rotating shaft 22 to rotate clockwise in the bearing seat 21, thereby driving the U-shaped frame 2 to rotate clockwise until the right wall of the U-shaped frame 2 abuts against the left wall of the baffle 12, so that the U-shaped frame 2 is restored to a vertical state; Start the lifting cylinder B34 to drive the straight frame 3 to move downward until the suction cup B30 corresponds to the packaging bag, start the suction cup B30 to adsorb the packaging bag on the suction cup A20, and cancel the suction of the suction cup A20. At this time, start the lifting cylinder B34 to drive the straight frame 3 to move upward and reset to the highest end, and start the driving motor A23 to drive the U-shaped frame 2 to rotate counterclockwise to the bottom plate 11; Start the driving motor B36 to drive the screw 37 to rotate clockwise in situ, and the screw 37 drives the screw block 38 to move rightward, so that the moving plate 33 drives the straight frame 3 to move rightward through the lifting cylinder B34. When the straight frame 3 moves to the rightmost end of the stroke, the packaging bag is located between the two straight plates 4; Start the telescopic cylinder C47 to retract its movable end, drive the rack 42 forward to make the two gears 41 rotate simultaneously, drive the two flat plates 4 to approach each other, until the suction cups C40 on both sides are in contact with both sides of the packaging bag, start the suction cups C40 to suck the two sides of the packaging bag, and cancel the suction of the suction cups B30 on the packaging bag; Start the telescopic cylinder C47 to extend its movable end, so that the two straight plates 4 move away from each other and the packaging bag is stretched open. The air pump 6 is moved downward by the lifting cylinder D63 until the air outlet pipe 61 extends into the packaging bag. Start the telescopic cylinder C47 to bring the straight plates 4 closer together again until the plug-in plate 53 is inserted into the plug-in groove 52, closing the bag opening and the air outlet pipe 61 is clamped in the through groove 51. At this time, start the air pump 6 to inflate the packaging bag through the air outlet pipe 61 to test the sealing of the packaging bag.

[0037] 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 packaging bag sealing performance testing device, comprising a workbench (1), characterized in that: A bottom plate (11) for placing packaging bags is fixedly installed on the left side of the workbench (1), and a U-shaped frame (2) is rotatably connected to the right end of the bottom plate (11). Two suction cups A (20) fixedly installed on the crossbar are symmetrically arranged between the two vertical bars of the U-shaped frame (2); The workbench (1) is provided with a straight frame (3) which is laterally slidably connected to the right side of the bottom plate (11), suction cups B (30) are fixedly installed at both ends of the straight frame (3), and an opening and closing mechanism is provided on the right side of the straight frame (3); The opening and closing mechanism comprises two relatively rotating flat plates (4), two suction cups C (40) are fixedly mounted below the left flat plate (4), and two suction cups C (40) are fixedly mounted above the right flat plate (4), and the openings of the suction cups C (40) on both sides are arranged opposite to each other; A plurality of plug-in slots (52) are provided on the right wall of the right straight plate (4), and a plurality of plug-in plates (53) adapted to the plug-in slots (52) are fixedly mounted on the left wall of the left straight plate (4); A vertically sliding air pump (6) is provided above the flat plate (4), and the air pump (6) is provided with an air outlet pipe (61) extending downward, and an air pressure sensor (62) is fixedly installed on the top of the air outlet pipe (61). Semicircular through grooves (51) are provided in the middle of opposite sides of the flat plate (4), and the two through grooves (51) are used to clamp the air outlet pipe (61).

2. The sealing performance testing device for packaging bags according to claim 1, characterized in that: Two longitudinally distributed support rods B (31) are fixedly installed on the workbench (1) at both sides of the bottom plate (11), and a horizontal plate B (32) extending to the right is fixedly installed on each of the support rods B (31), and a movable plate (33) is slidably connected to the two horizontal plates B (32); The fixed end of a lifting cylinder B (34) is fixedly mounted on the movable plate (33), and the movable end of the lifting cylinder B (34) extends downward, and the end is fixedly connected to the middle of the straight frame (3).

3. The sealing performance testing device for packaging bags according to claim 2, characterized in that: A rotating seat (35) is fixedly mounted on the right end of the rear end horizontal plate B (32), and a driving motor B (36) is fixedly mounted on the left end of the rear end horizontal plate B (32). The output shaft of the driving motor B (36) extends rightward and is connected to one end of a screw rod (37) through a coupling. The other end of the screw rod (37) is rotatably connected to the rotating seat (35), and a screw block (38) threadedly connected to the screw rod (37) is sleeved on the outer peripheral surface of the screw rod (37).

4. The sealing performance testing device for packaging bags according to claim 3, characterized in that: The bottom surface of the screw block (38) abuts against the top surface of the transverse plate B (32), and the top surface of the screw block (38) is fixedly connected to the bottom surface of the rear end of the movable plate (33); A slider (39) is fixedly mounted on the bottom surface of the front end of the movable plate (33), and the slider (39) is slidably connected to a slide rail (391), and the slide rail (391) is fixedly mounted on the transverse plate B (32) at the front end.

5. The sealing performance testing device for packaging bags according to claim 4, characterized in that: A gear (41) is fixedly mounted on the rear end of each of the flat plates (4), and a rack (42) that moves longitudinally is meshed and connected between two of the gears (41); A support rod C (43) is fixedly mounted on the right side of the transverse plate B (32), a transverse plate C (44) fixedly connected to the transverse plate B (32) is fixedly mounted on the support rod C (43), and the gears (41) are rotatably connected to the transverse plate C (44).

6. The sealing performance testing device for packaging bags according to claim 5, characterized in that: An extension plate (45) is fixedly mounted on the rear end of the transverse plate (44), a fixed end of a telescopic cylinder C (47) is fixedly mounted on the extension plate (45), a movable end of the telescopic cylinder C (47) extends backwards, and the end is fixedly connected to the rack (42) through a connecting plate C (46), and the connecting plate C (46) is slidably connected in a slide groove of the extension plate (45).

7. The sealing performance testing device for packaging bags according to claim 5, characterized in that: The fixed end of the lifting cylinder D (63) is fixedly installed in the middle of the rear side horizontal plate C (44), the movable end of the lifting cylinder D (63) extends upward and the end thereof is fixedly installed with the rear end of the connecting plate D (64), and the front end of the connecting plate D (64) is fixedly connected to the top end of the air pump (6).

8. The sealing performance testing device for packaging bags according to claim 1, characterized in that: Two longitudinally arranged bearing seats (21) are rotatably mounted on the right side of the bottom plate (11), a rotating shaft (22) is rotatably connected to each of the bearing seats (21) via a bearing, and the U-shaped frame (2) is fixedly mounted on the opposite side of the rotating shaft (22); A driving motor A (23) is provided on the bottom plate (11), and an output shaft of the driving motor A (23) is connected to the rotating shaft (22) on the front side via a coupling.

9. The sealing performance testing device for packaging bags according to claim 8, characterized in that: A vertically arranged baffle plate (12) is fixedly mounted on the right side of the bottom plate (11), and the baffle plate (12) limits the rotation angle of the U-shaped frame (2).

10. A method for testing the sealing performance of a packaging bag, characterized in that: It is characterized by comprising the following steps: S1: placing the packaging bag to be tested on the bottom plate (11); S2: rotating the U-shaped frame (2) so that it is in contact with one side of the packaging bag through the suction cup A (20), so that the suction cup A (20) absorbs the packaging bag, and then resetting the U-shaped frame (2) to a vertical state; S3: the straight frame (3) is moved downward to contact the other side of the packaging bag through the suction cup B (30), so that the suction cup B (30) adsorbs the packaging bag, and the suction cup A (20) adsorbs the packaging bag, so that the U-shaped frame (2) rotates to contact the packaging bag on the bottom plate (11), and the straight frame (3) is reset to the highest end; S4; the straight frame (3) drives the packaging bag to move rightward to between the two straight plates (4), so that the two straight plates (4) are close to each other and fit the two sides of the packaging bag through the suction cup C (40), so that the suction cup C (40) adsorbs the packaging bag, cancels the adsorption of the suction cup B (30) on the packaging bag, and resets the straight frame (3) to the leftmost end; S5: The two flat plates (4) are moved away from each other to open the packaging bag through the suction cup C (40), and the air pump (6) is moved downward until the air outlet pipe (61) extends into the packaging bag; S6: the two flat plates (4) are brought closer together until the plug-in plate (53) is inserted into the plug-in slot (52) to seal the bag opening, and the air pump (6) inflates the bag through the air outlet pipe (61); S7: Detecting the air pressure through the air pressure sensor (62). If the air pressure is stable, it means that the food packaging bag is not damaged. If the air pressure is unstable, it means that the food packaging bag is damaged.

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