Detection device for flexographic printing packaging bags and working method thereof

Abstract

The present invention belongs to the field of detection technology, and specifically relates to the field of static or dynamic balance testing of machines or structural components. The present invention is a detection device for flexographic printing packaging bags and a working method thereof, which comprises: a first conveying part and a second conveying part, respectively comprising: a first endless belt and a second endless belt, wherein the conveying surface of the first endless belt and the conveying surface of the second endless belt are arranged facing each other and rotate synchronously; a plurality of pushing components, which are arranged along the length direction of the first endless belt and are used to push the first endless belt to move toward the second endless belt to reduce the gap so that the packaging bag is conveyed under pressure; and a control module, which is electrically connected to the driver of the first conveying part and is suitable for driving the first endless belt to periodically change speed so that the packaging bag being conveyed can roll; and the packaging bag is squeezed during the packaging bag leakage detection process to accelerate the packaging bag leakage, so as to facilitate the accurate detection of the packaging bag leakage.

Description

Technical Field

[0001] The invention belongs to the field of detection technology, and in particular relates to a detection device for flexographic printing packaging bags and a working method thereof. Background Art

[0002] After the packaging bag is filled with the product, it needs to be tested for air leakage. The main air leakage points of the packaging bag are the seams, namely the horizontal seams at both ends and the longitudinal seams in the middle.

[0003] According to relevant technologies, existing air leakage detection devices generally transport packaging bags to a detection station via a conveyor belt, and then perform air tightness detection on the packaging bags via a detection unit; however, in this detection method, the packaging bags are stopped during detection, and the detection process also takes a certain amount of time, resulting in low efficiency. At the same time, the longitudinal seam of the packaging bag may face downward, causing the longitudinal seam to be blocked, thereby affecting the detection.

[0004] Therefore, how to detect the air tightness of the packaging bag without stopping the conveying is a technical problem that the technicians in this field need to solve urgently. Summary of the invention

[0005] The object of the present invention is to provide a detection device for flexographic printing packaging bags and a working method thereof.

[0006] In order to solve the above technical problems, the present invention provides a detection device for flexographic printing packaging bags, comprising:

[0007] The first conveying part and the second conveying part respectively include: a first endless belt and a second endless belt, wherein the conveying surface of the first endless belt and the conveying surface of the second endless belt are arranged facing each other and rotate synchronously;

[0008] A plurality of pushing components are arranged along the length direction of the first endless belt, and are used to push the conveying surface of the first endless belt to move toward the conveying surface of the second endless belt to reduce the gap, so that the packaging bag is conveyed under pressure; and

[0009] The control module is electrically connected to the driver of the first conveying part and is suitable for controlling the first endless belt to periodically adjust the speed so that the packaging bag being conveyed can roll;

[0010] During the conveying process, when the packaging bag is rolled to be compressed in the length direction, the vertical seam of the packaging bag is located between the first endless belt and the second endless belt, the pushing assembly is forced to move backward to pressurize the packaging bag and trigger the vibration motor to vibrate slightly to accelerate air leakage; and

[0011] During the conveying process, when the packaging bag leaks, the pushing component moves forward to trigger the vibration motor to accelerate the vibration so that the leaking packaging bag falls off.

[0012] Further, the first conveying part includes: a first support frame; the pushing assembly includes: a push plate and a spring;

[0013] The push plate is connected to the first support frame via a plurality of springs.

[0014] Furthermore, a distance sensor is provided on a surface of the push plate facing the first support frame, and the distance sensor is suitable for detecting the distance between the push plate and the first support frame.

[0015] Further, the vibration motor is arranged on the push plate, and the vibration motor is suitable for vibrating the push plate.

[0016] Further, the distance sensor and the vibration motor are electrically connected to the same control module;

[0017] The control module is suitable for controlling the vibration motor to vibrate the push plate according to the distance detected by the distance sensor.

[0018] Further, the second conveying part includes: a second support frame;

[0019] The second endless belt is arranged around the second supporting frame;

[0020] The surface of the second endless belt faces the surface of the first endless belt;

[0021] The packaging bag is clamped by the first endless belt and the second endless belt.

[0022] Furthermore, the detection device for flexographic printing packaging bags further comprises: a filling mechanism;

[0023] The filling mechanism is suitable for filling materials into packaging bags.

[0024] Furthermore, the filling mechanism comprises: a bracket, a funnel, a filling pipe, a quantitative turntable and a receiving plate;

[0025] The funnel is arranged on the bracket;

[0026] The quantitative turntable is arranged below the funnel;

[0027] The top surface of the quantitative rotating disk is open, and a plurality of receiving tubes are arranged on the inner bottom surface of the quantitative rotating disk;

[0028] Both ends of the receiving tube are open, the opening of the top surface of the receiving tube is flush with the inner bottom surface of the quantitative rotating disk, and the opening of the bottom surface of the receiving tube is lower than the bottom surface of the quantitative rotating disk;

[0029] The receiving plate is in contact with the bottom surface of the receiving tube;

[0030] The receiving plate is provided with a material dropping hole;

[0031] The filling pipe is arranged below the drop hole.

[0032] Further, the bracket is provided with a pair of vertical heat sealing strips and a pair of horizontal heat sealing strips;

[0033] The vertical heat sealing strip is arranged on one side of the filling pipe, and the vertical heat sealing strip is parallel to the filling pipe;

[0034] The transverse heat sealing strip is arranged below the filling pipe.

[0035] Further, a curved slide plate is provided below the transverse heat sealing strip;

[0036] The tail end of the arc-shaped slide plate is located above the conveyor belt;

[0037] The tail end of the conveyor belt is located below the first conveying portion and the second conveying portion.

[0038] Furthermore, a pair of baffles is provided on the conveyor belt.

[0039] On the other hand, the present invention also provides a working method using the above-mentioned flexographic printing packaging bag detection device, comprising:

[0040] The packaging bag is conveyed by the first conveying part and the second conveying part, the packaging bag is rotated during the conveying process, and the packaging bag is squeezed during the rotation process.

[0041] The beneficial effect of the present invention is that, by adopting the first endless belt and the second endless belt to convey the packaging bag, the present invention can detect whether the packaging bag is leaking during the conveying process, and there is no need to stop the conveying during the detection, thereby improving efficiency. At the same time, during the conveying process, since the vertical seam is in contact with the conveyor belt, the position of the vertical seam is rotated and adjusted by periodic acceleration of the first endless belt. When the packaging bag rotates (pressure is applied in the length direction), the pushing component retreats relative to the extrusion conveyor, triggering slight vibration to accelerate the leakage. When the packaging bag leaks, the pushing component moves forward relative to the extrusion conveyor, triggering accelerated vibration, thereby facilitating the falling of the leaking packaging bag.

[0042] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is a structural schematic diagram of a detection device for flexographic printing packaging bags of the present invention;

[0046] Figure 2 is a schematic structural diagram of the first conveying unit of the present invention;

[0047] Figure 3 It is a schematic diagram of the back structure of the filling mechanism of the present invention;

[0048] Figure 4 It is a front structural schematic diagram of the filling mechanism of the present invention.

[0049] In the figure:

[0050] 1 first conveying part, 11 first supporting frame, 12 first endless belt, 13 push plate, 14 spring;

[0051] 2 second conveying part, 21 second endless belt;

[0052] 3 filling mechanism, 31 support, 32 funnel, 33 filling pipe, 34 quantitative turntable, 35 receiving plate, 36 receiving cylinder, 37 horizontal heat sealing strip, 38 vertical heat sealing strip, 39 arc slide plate;

[0053] 4 conveyor belts, 41 baffles;

[0054] 5 packaging bags, 51 vertical seams. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. 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.

[0056] like Figures 1 to 4As shown, in at least one embodiment, a detection device for flexographic printing packaging bags 5 is provided, comprising: a first conveying part 1 and a second conveying part 2, respectively comprising: a first endless belt 12 and a second endless belt 21, wherein the conveying surface of the first endless belt 12 and the conveying surface of the second endless belt 21 are arranged facing each other and rotate synchronously; a plurality of pushing components, arranged along the length direction of the first endless belt 12, and used to push the conveying surface of the first endless belt 12 to move toward the conveying surface of the second endless belt 21 to reduce the gap between the two, so that the packaging bags 5 are conveyed under pressure; and a control module, electrically connected to the driver of the first conveying part 1 It is suitable for controlling the periodic speed regulation of the first endless belt 12 to make the packaging bag 5 in transportation roll; wherein during the transportation process, when the packaging bag 5 rolls to be compressed in the length direction, the vertical seam 51 of the packaging bag 5 is located between the first endless belt 12 and the second endless belt 21, and is compressed in the width direction relative to the packaging bag 5, the pushing component is forced to retreat to pressurize the packaging bag 5, and triggers the vibration motor to vibrate slightly to accelerate the leakage; and during the transportation process, when the packaging bag 5 leaks, relative to the packaging bag 5 being compressed in the width direction, the pushing component moves forward to trigger the vibration motor to accelerate the vibration to make the leaking packaging bag 5 fall.

[0057] In this embodiment, the conveying surface of the first endless belt 12 and the conveying surface of the second endless belt 21 are arranged vertically, while the conveying surface of the normal conveyor belt is arranged horizontally; when the packaging bag 5 is conveyed on the normal conveyor belt, in order to avoid tipping over during the conveying process, the length direction of the packaging bag 5 is generally consistent with the conveying direction of the conveyor belt, so the vertical seam 51 of the packaging bag 5 will be pressed by the first endless belt 12 or the second endless belt 21 during the pressure conveying; this scheme uses the first endless belt 12 and the second endless belt 21 to convey the packaging bag 5, so that the packaging bag 5 can be detected during the conveying process to see if there is leakage, and there is no need to stop the conveying during the detection, thereby improving the efficiency. At the same time, during the conveying process, since the vertical seam 51 is in contact with the conveyor belt, the position of the vertical seam 51 is rotated and adjusted by periodic acceleration of the first endless belt 12. When the packaging bag 5 rotates (under pressure in the length direction), the pushing component retreats relative to the extrusion conveying, triggering slight vibration to accelerate the leakage. When the packaging bag 5 leaks, the pushing component moves forward relative to the extrusion conveying, triggering accelerated vibration, so as to facilitate the falling of the leaking packaging bag 5.

[0058] The packaging bag 5 is sandwiched between the first conveying part 1 and the second conveying part 2. In order to ensure the smooth conveying of the packaging bag 5, the conveying speeds of the first endless belt 12 and the second endless belt 21 are controlled to be the same; when detecting, the first endless belt 12 is controlled to adjust the speed so that the packaging bag 5 rolls 90 degrees and then stops rolling (the speed adjustment method is: the first endless belt 12 is controlled to accelerate to a threshold relative to the second endless belt 21, and then decelerates to the same conveying speed as the second endless belt 21, wherein the acceleration process causes the packaging bag 5 to roll a certain angle, and the deceleration process also causes the packaging bag 5 to roll a certain angle, and the two stages of the journey roll a total of 90 degrees). After rolling 90 degrees, the vertical seam 5 of the packaging bag 5 1 is located between the first endless belt 12 and the second endless belt 21. At this time, since the packaging bag 5 is compressed in the length direction, relative to the width direction, the force applied to the pushing component is greater, causing the pushing component to retreat. At this time, the packaging bag 5 is subjected to a greater extrusion force, which facilitates the detection of whether the vertical seam 51 is leaking. When there is a leak, the gas in the packaging bag 5 will gradually decrease. When the first endless belt 12 is adjusted to make the packaging bag 5 roll 90 degrees again, the force applied to the pushing component will be smaller than that of a normal packaging bag 5. The packaging bag 5 is not sufficient to be compressed and transported, and the vibration of the vibration motor will cause it to fall. Each pushing component is provided with an independent vibration motor.

[0059] The bottom surfaces of the first conveying part 1 and the second conveying part 2 are at a certain height from the ground, and the leaking packaging bag 5 can fall from between the first conveying part 1 and the second conveying part 2. A box body or a conveying mechanism for receiving the leaking packaging bag 5 can be set on the ground.

[0060] The pushing assembly includes: a pushing plate 13 and a spring 14; the pushing plate 13 is connected to the first support frame 11 via a plurality of springs 14; the springs 14 can make the pushing plate 13 press against the first endless belt 12, so that the first endless belt 12 contacts the packaging bag 5; Figure 2 The drawing of the first endless belt 12 is to highlight the position of the push plate 13 in different situations.

[0061] A distance sensor is provided on the side of the push plate 13 facing the first support frame 11, and the distance sensor is suitable for detecting the distance between the push plate 13 and the first support frame 11; a vibration motor is provided on the push plate 13, and the vibration motor is suitable for vibrating the push plate 13; the distance sensor and the vibration motor are electrically connected to the same control module; the control module is suitable for controlling the vibration motor to vibrate the push plate 13 according to the distance detected by the distance sensor;The packaging bag 5 can be transported horizontally to between the first conveying part 1 and the second conveying part 2 by the conveyor belt 4, that is, at this time, the length direction of the packaging bag 5 is parallel to the conveying direction of the first conveying part 1 and the second conveying part 2, and the distance between the initial position of the push plate 13 and the first support frame 11 is greater than the preset standard distance. The standard distance between the push plate 13 and the first support frame 11 is the distance between the push plate 13 and the first support frame 11 when the push plate 13 pushes the packaging bag 5 without air leakage against the second conveyor belt 4, plus a certain amount of error. When the packaging bag 5 is transported horizontally to between the first conveying part 1 and the second conveying part 2, the packaging bag 5 contacts the push plate 13 at the initial position, and the push plate 13 is pushed toward the first support frame 11. Extrusion, if the distance between the push plate 13 and the first support frame 11 is the standard distance, the vibration motor does not work, and the push plate 13 does not vibrate. If the distance between the push plate 13 and the first support frame 11 is greater than the standard distance, the vibration motor drives the push plate 13 to vibrate. If the distance between the push plate 13 and the first support frame 11 is less than the standard distance, the vibration motor drives the push plate 13 to vibrate. When the distance between the push plate 13 and the first support frame 11 is greater than the standard distance, the vibration motor can drive the push plate 13 to vibrate at a faster frequency and a larger amplitude. After the packaging bag 5 moves laterally between the first conveying part 1 and the second conveying part 2, the transportation speed of the first endless belt 12 changes, so that the transportation speed of the first endless belt 12 is the same as that of the second endless belt 2. 1 is different, the horizontal packaging bag 5 gradually rotates 90 degrees to the vertical direction, that is, the length direction of the packaging bag 5 is perpendicular to the conveying direction of the second endless belt 21. When the packaging bag 5 gradually rotates to the vertical direction, the push plate 13 will be squeezed toward the first support frame 11, and the vibration motor drives the push plate 13 to vibrate. After the conveyor belt 4 is vertical, the transportation speed of the first endless belt 12 is adjusted to the same as that of the second conveyor belt 4, and the vertical packaging bag 5 is transported for a distance. At this time, the vibration of the push plate 13 will drive the packaging bag 5 to vibrate. If the packaging bag 5 leaks, the vibration can accelerate the leakage of the packaging bag 5. The squeezing of the packaging bag 5 by the push plate 13 and the vibration of the packaging bag 5 accelerate the leakage of the packaging bag 5. After the vertical packaging bag 5 is transported for a distance, The transport speed of the first endless belt 12 is adjusted so that the packaging bag 5 rotates to the horizontal direction again, and then the transport speed of the first endless belt 12 is made the same as that of the second endless belt 21. After a certain distance of horizontal transport, the transport speed of the first endless belt 12 is adjusted again so that the packaging bag 5 rotates to the vertical direction. After the vertical direction, the packaging bag 5 is further transported for a certain distance, and then the packaging bag 5 is rotated to the horizontal direction again. The packaging bag 5 rotates one circle to ensure that the position where the packaging bag 5 may leak is not blocked. If the leakage vibration occurs, the leakage of the packaging bag 5 is accelerated. After one circle of rotation, the leaking packaging bag 5 cannot be supported by the push plate 13 and the second endless belt 21, and the packaging bag 5 will fall. The leaking packaging bag 5 can be accurately judged and removed.When the packaging bag 5 is in a horizontal state, if the distance between the push plate 13 and the first support frame 11 is greater than the preset standard distance, it is determined that the packaging bag 5 is leaking. Therefore, faster vibration can accelerate the leakage of the packaging bag 5, so that the packaging bag 5 can fall from between the first endless belt 12 and the second endless belt 21.

[0062] In some embodiments, the push plate 13 is slidably set on the first support frame 11, and a guide column is set on the side of the push plate 13 facing the first support frame 11. A guide hole is opened on the first support frame 11, and the guide column of the push plate 13 is slidably set in the guide hole. The guide hole has a certain depth so that the push plate 13 always maintains a horizontal direction during the sliding process. The spring 14 is sleeved on the periphery of the guide column, one end of the spring 14 is connected to the push plate 13, and the other end is connected to the first support frame 11.

[0063] The second conveying part 2 includes: a second supporting frame and a second annular belt 21; the second annular belt 21 is arranged around the second supporting frame; the surface of the second annular belt 21 faces the surface of the first annular belt 12; the packaging bag 5 is clamped by the first annular belt 12 and the second annular belt 21; the second annular belt 21 and the first annular belt 12 can both be rotated by a motor drive; the surface of the second annular belt 21 and the first annular belt 12 is the side that contacts the packaging bag 5.

[0064] The transport speed of the first endless belt 12 is set to be variable speed; the transport speed of the second endless belt 21 is set to be uniform speed; through the transport speed variable setting of the first endless belt 12, the packaging bag 5 is rotated during transportation.

[0065] The detection device for the flexographic printing packaging bag 5 also includes: a filling mechanism 3; the filling mechanism 3 is suitable for filling the material into the packaging bag 5; during the filling process, air can be inflated into the packaging bag 5, so that the packaging bag 5 is in an expanded state, which is convenient for controlling the size of the packaging bag 5.

[0066] The filling mechanism 3 includes: a bracket 31, a funnel 32, a filling pipe 33, a quantitative turntable 34 and a receiving plate 35; the funnel 32 is arranged on the bracket 31; the quantitative turntable 34 is arranged below the funnel 32; the top surface of the quantitative turntable 34 is open, and a plurality of receiving tubes 36 are arranged on the inner bottom surface of the quantitative turntable 34; both ends of the receiving tubes 36 are open, the opening of the top surface of the receiving tube 36 is flush with the inner bottom surface of the quantitative turntable 34, and the opening of the bottom surface of the receiving tube 36 is lower than the bottom surface of the quantitative turntable 34; the receiving plate 35 and the receiving tube 36 are connected. The receiving plate 35 is provided with a material drop hole; the filling pipe 33 is arranged below the material drop hole; the quantitative turntable 34 can be driven to rotate by a motor or the like, and after the funnel 32 inputs a quantitative amount of material into the receiving tube 36, the receiving tube 36 is rotated to correspond to the material drop hole through the rotation of the quantitative turntable 34, and the material is filled through the filling pipe 33; a cover plate (not shown in the figure) can be provided on the top surface of the receiving tube 36, and the cover plate is tightly attached to the inner bottom surface of the quantitative turntable 34. When the material in the funnel 32 enters the receiving tube 36, the receiving tube 36 is covered by the cover plate, so that the material in the receiving tube 36 is quantitative.

[0067] The bracket 31 is provided with a pair of vertical heat-sealing strips 38 and a pair of transverse heat-sealing strips 37; the vertical heat-sealing strips 38 are arranged on one side of the filling pipe 33, and the vertical heat-sealing strips 38 are parallel to the filling pipe 33; the transverse heat-sealing strips 37 are arranged below the filling pipe 33; the packaging film can form a tubular packaging bag 5 outside the filling pipe 33 through a lapel and other structures, the vertical heat-sealing strips 38 heat-seal the side wall of the packaging bag 5, and the transverse heat-sealing strips 37 first heat-seal the bottom of the packaging bag 5, and then heat-seal the top of the packaging bag 5 after the filling is completed. The top of the packaging bag 5 filled with materials will fall on the arc-shaped slide 39 after heat-sealing. The pair of vertical heat-sealing strips 38 and the pair of transverse heat-sealing strips 37 can be driven by cylinders or the like to move closer to or farther from each other.

[0068] An arc-shaped slide 39 is arranged below the transverse heat-sealing strip 37 ; the tail end of the arc-shaped slide 39 is located above the conveyor belt 4 ; the tail end of the conveyor belt 4 is located below the first conveying part 1 and the second conveying part 2 ; the arc-shaped slide 39 can transport the filled packaging bag 5 to the conveyor belt 4 .

[0069] The conveyor belt 4 is provided with a pair of baffles 41 , and the baffles 41 enable the packaging bag 5 to be in a horizontal state on the conveyor belt 4 .

[0070] In at least one other embodiment, a working method using the above-mentioned detection device for flexographic printing packaging bags 5 is also provided, including: conveying the packaging bags 5 through the first conveying part 1 and the second conveying part 2, rotating the packaging bags 5 during the conveying process, and squeezing the packaging bags 5 during the rotation process.

[0071] In summary, the present invention adopts the first annular belt 12 and the second annular belt 21 to convey the packaging bag 5, so that the packaging bag 5 can be detected during the conveying process. There is no need to stop the conveying during the detection, thereby improving efficiency. At the same time, during the conveying process, since the vertical seam 51 is in contact with the conveyor belt, the position of the vertical seam 51 is rotated and adjusted by periodic acceleration of the first annular belt 12. When the packaging bag 5 rotates (pressed in the length direction), the pushing component retreats relative to the extrusion conveyor, triggering slight vibration to accelerate the leakage. When the packaging bag 5 leaks, the pushing component moves forward relative to the extrusion conveyor, triggering accelerated vibration, so as to facilitate the falling of the leaking packaging bag 5.

[0072] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0073] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0075] With the above-mentioned ideal embodiments of the present invention as inspiration, through the above-mentioned description content, relevant personnel can make various changes and modifications without departing from the scope of the technical idea of ​​the present invention.

Claims

1. A detection device for flexographic printing packaging bags, characterized in that: include: A first conveying part and a second conveying part, wherein the first conveying part comprises a first endless belt, and the second conveying part comprises a second endless belt, and the conveying surface of the first endless belt and the conveying surface of the second endless belt are arranged facing each other and rotate synchronously; The conveying surface of the first endless belt and the conveying surface of the second endless belt are arranged vertically; A plurality of pushing components are arranged along the length direction of the first endless belt, and are used to push the conveying surface of the first endless belt to move toward the conveying surface of the second endless belt to reduce the gap, so that the packaging bag is conveyed under pressure; The first conveying part includes: a first support frame; The pushing assembly comprises: a pushing plate and a spring; The push plate is connected to the first support frame via a plurality of springs; The control module is electrically connected to the driver of the first conveying part and is suitable for controlling the first endless belt to periodically adjust the speed so that the packaging bag being conveyed can roll; During the conveying process, when the packaging bag moves laterally between the first endless belt and the second endless belt, the vertical seam on the packaging bag contacts the conveying surface of the first endless belt or the second endless belt, and the position of the vertical seam is rotated and adjusted by periodic acceleration of the first endless belt. When the packaging bag rolls to be compressed in the length direction, the vertical seam of the packaging bag is located between the first endless belt and the second endless belt, ensuring that the position of the air leakage on the packaging bag is not blocked. At this time, the pushing component is forced to retreat to pressurize the packaging bag, and triggers the vibration motor to vibrate slightly to accelerate the air leakage; and During the conveying process, when the packaging bag leaks, the pushing component moves forward to trigger the vibration motor to accelerate the vibration to make the leaking packaging bag fall. After the packaging bag rotates one circle, the leaking packaging bag cannot be supported by the push plate and the second circular belt in the pushing component, and the packaging bag falls.

2. The detection device for flexographic printing packaging bags according to claim 1, characterized in that: A distance sensor is provided on a surface of the push plate facing the first support frame, and the distance sensor is suitable for detecting the distance between the push plate and the first support frame.

3. The detection device for flexographic printing packaging bags according to claim 2, characterized in that: The vibration motor is disposed on the push plate, and the vibration motor is suitable for vibrating the push plate.

4. The detection device for flexographic printing packaging bags according to claim 3, characterized in that: The distance sensor and the vibration motor are electrically connected to the same control module; The control module is suitable for controlling the vibration motor to vibrate the push plate according to the distance detected by the distance sensor.

5. The detection device for flexographic printing packaging bags according to claim 4, characterized in that: The second conveying part includes: a second support frame; The second endless belt is arranged around the second supporting frame; The surface of the second endless belt faces the surface of the first endless belt; The packaging bag is clamped by the first endless belt and the second endless belt.

6. The detection device for flexographic printing packaging bags according to claim 5, characterized in that: The detection device for flexographic printing packaging bags also includes: a filling mechanism; The filling mechanism is suitable for filling materials into packaging bags.

7. The detection device for flexographic printing packaging bags according to claim 6, characterized in that: The filling mechanism comprises: a bracket, a funnel, a filling pipe, a quantitative turntable and a receiving plate; The funnel is arranged on the bracket; The quantitative turntable is arranged below the funnel; The top surface of the quantitative rotating disk is open, and a plurality of receiving tubes are arranged on the inner bottom surface of the quantitative rotating disk; Both ends of the receiving tube are open, the opening of the top surface of the receiving tube is flush with the inner bottom surface of the quantitative rotating disk, and the opening of the bottom surface of the receiving tube is lower than the bottom surface of the quantitative rotating disk; The receiving plate is in contact with the bottom surface of the receiving tube; The receiving plate is provided with a material dropping hole; The filling pipe is arranged below the drop hole.

8. The detection device for flexographic printing packaging bags according to claim 7, characterized in that: The bracket is provided with a pair of vertical heat sealing strips and a pair of horizontal heat sealing strips; The vertical heat sealing strip is arranged on one side of the filling pipe, and the vertical heat sealing strip is parallel to the filling pipe; The transverse heat sealing strip is arranged below the filling pipe.

9. The detection device for flexographic printing packaging bags according to claim 8, characterized in that: An arc-shaped slide plate is arranged below the transverse heat sealing strip; The tail end of the arc-shaped slide plate is located above the conveyor belt; The tail end of the conveyor belt is located below the first conveying portion and the second conveying portion.

10. The detection device for flexographic printing packaging bags according to claim 9, characterized in that: A pair of baffles are arranged on the conveyor belt.

11. A working method using the detection device for flexographic printing packaging bags as claimed in claim 1, characterized in that: include: The packaging bag is conveyed by the first conveying part and the second conveying part, the packaging bag is rotated during the conveying process, and the packaging bag is squeezed during the rotation process.

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