An automatic plastic packaging machine

Abstract

The application discloses an automatic plastic sealing machine, which comprises a plastic sealing machine body, a first guide plate and a second guide plate arranged in parallel on the inlet side of the plastic sealing machine body, a channel for plastic sealing parts is formed between the first guide plate and the second guide plate, an elastic structure capable of ascending and descending is arranged in the channel and used for abutting against the plastic sealing parts, a swing arm which swings along with the elastic structure is arranged on the elastic structure, a magnet is arranged at one end of the swing arm, a Hall sensor is further arranged on the plastic sealing machine body, and the Hall sensor is located at the proximal end of the magnet. The technical scheme has the advantages that a complex temperature grade adjusting structure does not need to be arranged, and only a constant temperature needs to be arranged to meet the plastic sealing requirements of plastic sealing films with different thicknesses.

Description

Technical Field

[0001] This application relates to the technical field of laminator structure, and more specifically, to an automatic laminator. Background Technology

[0002] A laminator, also known as a glue applicator, is a device used for laminating the outer surface of documents. The device includes a laminator body with an inlet on one side and an outlet on the opposite side. A first guide plate and a second guide plate, arranged parallel to each other, are positioned above and below the inlet side, with a gap between them forming a channel for the laminator. An internal motor traction assembly automatically pulls and guides the laminator into the machine to complete the lamination and delivery operations, thus creating an automatic laminator.

[0003] Currently, different laminating files require laminating films of different thicknesses. Different thicknesses require corresponding laminating temperatures, which also need to be adjusted accordingly. Therefore, if existing laminating machines need to achieve lamination of films of different thicknesses, they must be equipped with adjustment mechanisms to achieve different temperature settings. The installation of these mechanisms not only increases the structural complexity of the laminating machine, but also makes the operation process more cumbersome, requiring manual adjustment of different temperature settings, which brings inconvenience to the operation. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, this application provides an automatic laminator that does not require a complex temperature adjustment structure, but only requires setting a constant temperature to meet the lamination requirements of laminators of different thicknesses.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows: an automatic laminator, which includes a laminator body. The laminator body has a first guide plate and a second guide plate arranged parallel to each other on the inlet side. A channel for forming a laminator is formed between the first guide plate and the second guide plate. An elastic structure that can move up and down and abut against the laminator is also provided in the channel. A swing arm that swings with the elastic structure is provided on the elastic structure. A magnet is provided at one end of the swing arm. A Hall sensor is also provided on the laminator body. The Hall sensor is located near the magnet.

[0006] Using the above structure, this application provides an elastic structure that abuts against the channel of the encapsulated component. This elastic structure has a swing arm that oscillates with the structure. After encapsulated components covered with encapsulating films of varying thicknesses enter the channel and abut against the elastic structure, the structure moves up and down elastically according to the thickness of the encapsulated component. The swing arm on the elastic structure also moves up and down elastically, and a magnet at one end of the swing arm also moves up and down elastically. During this process, the distance and relative position between the magnet and the Hall sensor change. This change in distance and position causes the CPU inside the encapsulating machine to receive different Hall signal values ​​from the Hall sensor. Specifically, the thicker the encapsulating film, the stronger the Hall signal value, and the slower the motor speed of the traction component of the encapsulated component controlled by the mainboard of the automatic encapsulating machine becomes. At this time, the encapsulating film and the heating element... The longer the contact time between the heating structure and the sealing film, the better the sealing requirements for thicker films can be met. Conversely, the thinner the sealing film, the smaller the Hall signal value, and the faster the motor speed of the traction component of the sealing element inside the automatic sealing machine is controlled by the main board. This results in a shorter contact time between the sealing film and the heating structure, allowing for the sealing of thinner films to be achieved by reducing the contact time. Therefore, the sealing machine of this application only needs to set a constant heating temperature and then adjust the contact time between the sealing film and the heating structure using the structure described above to meet the sealing requirements for films of different thicknesses. Thus, this structure does not require a complex temperature setting adjustment structure or manual temperature adjustment, and the entire sealing process is fully automated.

[0007] Furthermore, the elastic structure includes a push rod and a reset elastic element. The reset elastic element is connected between the housing and the push rod, and the lower end of the push rod abuts against the plastic sealant. One end of the swing arm is rotatably connected to the push rod. With this structure, when the plastic sealant covered with plastic sealant of different thicknesses abuts against the push rod, the push rod is pushed up, which compresses the reset elastic element, causing the push rod to be at different heights. At this time, the swing arm rotatably connected to the push rod drives the swing arm to move up and down at one end, and the other end where the magnet is located also moves up and down in the opposite direction, thereby causing different positional changes between the magnet and the Hall sensor, causing the Hall sensor to generate Hall signal values ​​of different strengths.

[0008] Furthermore, the first guide plate is provided with a through hole, through which the push rod passes vertically to enter the channel. This structure provides sufficient layout space for the elastic structure and positions the push rod directly above the plastic sealant, enabling more precise sensing of plastic sealant films of different thicknesses. This allows the Hall sensor to sense and transmit signals of varying strengths based on the thickness of the plastic sealant.

[0009] Furthermore, the push rod is fitted with the reset elastic element, and the two ends of the reset elastic element abut against the inner wall of the housing and the top rod located on the push rod, respectively; the top rod extends along the thickness direction of the push rod, and the extension length of the top rod is not less than the radius of the reset elastic element; with this structure, the reset elastic element can be smoothly abutted against the top rod, thereby pushing the push rod to abut against plastic sealing films of different thicknesses.

[0010] Furthermore, the bottom end of the push rod is provided with a roller, which is used to abut against the plastic sealant. With this structure, when the plastic sealant covered with the plastic sealant comes into contact with the roller, the two roll into contact with each other with low friction, which can smoothly realize the operation from the inlet side to the outlet side, and avoid excessive friction that would affect the operation of the plastic sealant.

[0011] Furthermore, the housing includes a first housing and a second housing that are relatively closed to each other. The first housing is fixedly connected to the first guide plate. The lateral extension length of the first housing is greater than that of the second housing. The swing arm extends laterally out of the second housing, and the magnet is connected to the extension end. The Hall sensor is fixed to the circuit board, and the circuit board is connected to the lateral extension of the first housing. With the above structure, the push rod and the reset elastic element can be protected inside the housing, while the magnet on the swing arm extending out of the second housing can change position with the fixed Hall sensor. The exposed Hall sensor and circuit board facilitate signal connection with the main unit of the sealing machine and are not affected by other components.

[0012] Furthermore, the swing arm is provided with a first rotating hole, and the corresponding first housing is provided with a first rotating shaft. The first rotating hole is rotatably fitted onto the first rotating shaft. With this structure, the first rotating shaft forms the rotation fulcrum of the swing arm. Thus, when the push rod drives one end of the swing arm to elastically rise and fall, the other end of the magnet can be stably raised and lowered by the support of the fulcrum, thereby realizing the change of relative position with the Hall sensor.

[0013] Furthermore, the distance between the first rotating hole and the connecting end of the push rod is less than the distance between the connecting end and the magnet; that is, the setting position of the first rotating hole divides the swing arm into left and right sections, wherein the length of the first rotating hole from the push rod side is less than the length from the magnet end. In this way, when the swing arm swings with the push rod, the lever arm of the magnet end is longer. Even if there is a small difference in the thickness of the sealing film, the Hall sensor can accurately capture this change, thereby transmitting Hall signal values ​​of different intensities to the main board of the sealing machine.

[0014] Furthermore, the push rod is also provided with a second rotating shaft, and the swing arm is provided with a second rotating hole. The second rotating hole is located near the end of the push rod and is rotatably fitted onto the second rotating shaft. With this structure, the swing arm is rotatably connected to the push rod near the push rod. The swing arm has two rotating holes, which effectively support the magnet end of the swing arm, allowing it to swing elastically up and down with the push rod and change position with the fixed Hall sensor.

[0015] Furthermore, the housing is provided with a sliding groove hole for the push rod to slide up and down, and the inner contour of the sliding groove hole matches the cross-section of the push rod. With this structure, the push rod can slide elastically up and down in the sliding groove hole, which restricts the sliding trajectory of the push rod. In addition, the cross-section of the push rod can be a non-circular structure, such as a square or polygonal structure, so that it will not rotate circumferentially after being matched with the sliding groove hole, thereby ensuring that the roller below and the encapsulated part always maintain rolling contact. Attached Figure Description

[0016] Figure 1 The first view of the structural schematic diagram of the guide plate and elastic structure of the sealing machine of this application.

[0017] Figure 2 The second view of this application is a structural schematic diagram of the combination of the guide plate and the elastic structure of the sealing machine.

[0018] Figure 3 The third view of this application shows a structural schematic diagram of the combination of the guide plate and the elastic structure of the sealing machine.

[0019] Figure 4 This application presents a schematic diagram of the elastic structure.

[0020] Figure 5 This application presents a schematic diagram of the structure in the first exploded view of the elastic structure.

[0021] Figure 6 This application presents a schematic diagram of the structure in the second exploded view of the elastic structure.

[0022] Figure 7 This application presents a structural schematic diagram of a laminating machine.

[0023] Figure 8 This application presents a structural schematic diagram of the sealing machine after removing the cover.

[0024] Figure 9 This application presents a structural schematic diagram of the sealing machine with the cap removed (second view).

[0025] Figure 10 This application presents a schematic diagram of the distribution relationship between the elastic structure, the swing arm, and the Hall sensor.

[0026] As shown in the attached diagram: a. Sealing machine body, 1. First guide plate, 101. Through hole, 2. Second guide plate, 3. Channel, 4. Elastic structure, 401. Push rod, 402. Reset elastic element, 403. Top rod, 404. Second rotating shaft, 5. Swing arm, 501. First rotating hole, 502. Second rotating hole, 6. Magnet, 7. Hall sensor, 8. Circuit board, 9. Housing, 901. First housing, 902. Second housing, 903. First rotating shaft, 904. Slide hole, 10. Roller. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are merely preferred embodiments, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] Furthermore, it should be noted that: when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be another intermediate component for fixing. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be another intermediate component present. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be another intermediate component present. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only; the descriptions of front, back, top, bottom, left, and right orientations in this application refer to the normal operating state of the laminator described in this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular, specific embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] As attached Figure 1-10As shown, this application discloses an automatic laminator, which includes a laminator body a. The laminator body a has a first guide plate 1 and a second guide plate 2 arranged parallel to each other on its inlet side. A channel 3, which forms a laminator, is spaced between the first guide plate 1 and the second guide plate 2. An elastic structure 4, capable of moving up and down and contacting the laminator, is also provided within the channel 3. A swing arm 5, which swings with the elastic structure 4, is provided on the elastic structure 4. A magnet 6 (magnetic steel) is provided at the end of the swing arm 5 away from the push rod. A Hall sensor 7 is also provided on the laminator body a, located near the magnet 6. Specifically... In this application, the Hall sensor 7 is soldered onto the circuit board 8 and fixed to the injection molded part body a as a whole with the circuit board 8. When the magnet 6 approaches the Hall sensor 7, a magnetic field is generated between them. According to the elastic structure 4, the swing arm 5 drives the magnet 6 and the Hall sensor 7 to change position, so that the Hall sensor 7 generates Hall signal values ​​of different strengths. Then the Hall signal value is transmitted to the CPU of the sealing machine, and then the main board of the sealing machine controls the speed of the motor that pulls the sealing film, thereby adjusting the contact time between the sealing film and the heating structure inside the sealing machine, so as to adjust the heating time of the sealing film of different thicknesses to meet the sealing requirements.

[0030] Using the above structure, this application provides an elastic structure 4 that abuts against the channel of the plastic sealant. This elastic structure 4 has a swing arm 5 that swings with it. After the plastic sealant, covered with different thicknesses of plastic sealant film, enters the channel 3, it abuts against the elastic structure 4. The elastic structure 4 moves up and down elastically according to the thickness of the plastic sealant, and the swing arm on it also moves up and down elastically. A magnet 6 at one end of the swing arm 5 also moves up and down elastically. During this process, the distance and relative position between the magnet 6 and the Hall sensor 7 change. This change in distance and position causes the CPU inside the sealing machine to receive Hall signal values ​​of varying strengths or magnitudes from the Hall sensor. Specifically, the thicker the plastic sealant film, the stronger the Hall signal value, and the slower the motor speed of the traction component of the plastic sealant inside the sealing machine, controlled by the mainboard of the automatic sealing machine, will be. The longer the contact time between the sealing film and the heating structure, the better the sealing requirements for thicker films can be met. Conversely, the thinner the sealing film, the smaller the Hall signal value, and the faster the motor speed of the traction component inside the sealing machine controlled by the main board of the automatic sealing machine will be. This results in a shorter contact time between the sealing film and the heating structure, allowing for the sealing of thinner films to be achieved by reducing the contact time. Therefore, the sealing machine of this application only needs to set a constant heating temperature and then adjust the contact time between the sealing film and the heating structure using the structure described above to meet the sealing requirements for films of different thicknesses. Thus, this structure does not require a complex temperature setting adjustment structure or manual temperature adjustment, and the entire sealing process is fully automated.

[0031] As attached Figure 1-6 and Figure 10 As shown, the elastic structure 4 described in this application includes a push rod 401 and a reset elastic element 402. The reset elastic element 402 is connected between the housing 9 and the push rod 401. The lower end of the push rod 401 abuts against the plastic sealant. One end of the swing arm 5 is rotatably connected to the push rod 401. Specifically, the push rod 401 is vertically arranged in the channel 3, and the elastic reset element 402 is sleeved on the upper end of the push rod 401, which can elastically push the push rod 401 so that the push rod 401 always has a certain force on the plastic sealant. With this structure, when the plastic sealant covered with plastic sealant film of different thicknesses comes into contact with the push rod 401, the push rod 401 is pushed up, which will compress the reset elastic element 402 so that the push rod 401 is at different heights. At this time, the swing arm 5, which is rotatably connected to the push rod 401, drives the swing arm 5 to move up and down, and the other end of the swing arm 5, which is equipped with magnet 6, also moves up and down in the opposite direction, so that the magnet 6 and the Hall sensor 7 change positions, and generate Hall signal values ​​of different strengths according to the position changes.

[0032] As attached Figure 2-3 and Figure 8 As shown, the first guide plate 1 described in this application is provided with a through hole 101, and the push rod 401 vertically passes through the through hole 101 to enter the channel 3. Specifically, the outline of the through hole 101 is larger than the outer circumferential area of ​​the push rod 401 to prevent the push rod 401 from being scratched. The lower end of the push rod 401 extends into the channel 3, and the upper end can extend out of the housing 9, and a limiting structure is provided to abut against the upper end surface of the housing 9. With this structure, sufficient layout space can be provided for the elastic structure 4, and the push rod 401 is located directly above the plastic sealant, which can more accurately realize the sensing of plastic sealant films of different thicknesses, so that the Hall sensor 7 can realize the sensing and transmission of Hall signal values ​​of different strengths according to the plastic sealant films of different thicknesses.

[0033] As attached Figure 5-6 and Figure 10 As shown, the push rod 401 described in this application is fitted with the reset elastic element 402. The two ends of the reset elastic element 402 abut against the inner wall of the housing 9 and the top rod 403 located on the push rod 401, respectively. The top rod 403 extends along the thickness direction of the push rod 401, and the extension length of the top rod 403 is not less than the radius of the reset elastic element 402. Specifically, the reset elastic element 402 can be a straight spring, with one end abutting against the upper top wall inside the housing 9 and the other end abutting against the top rod 403 on the push rod 401. The upper end of the push rod 401 can be provided with a limiting structure to allow... It limits the vertical movement between itself and the housing 9, preventing the push rod 401 from falling or detaching under the action of the reset elastic element 402, thus ensuring the reset of the push rod 401. A pair of push rods 403 extend symmetrically along the thickness direction of the push rod 401. They can be cylindrical or cuboid in shape, etc., and can hold the lower end of the reset elastic element 402. Its upper end is held by the inner top wall of the housing 9, thereby forming an elastic compression between the housing 9 and the push rod 403. With this structure, the reset elastic element 402 can be stably held against the push rod 403, thereby pushing the push rod 401 to meet the plastic sealing film of different thicknesses.

[0034] As attached Figure 3 , Figure 5-6 and Figure 10 As shown, the bottom end of the push rod 401 described in this application is provided with a roller 10, which is used to abut against the plastic sealant. Specifically, the roller 10 is rotatably connected to the bottom end of the push rod 401 via a rotating shaft, and its rolling direction is consistent with the paper feeding direction of the plastic sealant. With this structure, when the plastic sealant covered with the plastic sealant comes into contact with the roller 10, the two are in rolling contact with low friction, which can smoothly realize the operation from the inlet side to the outlet side, avoiding excessive friction that would affect the operation of the plastic sealant.

[0035] As attached Figure 5-6 and Figure 8-9 As shown, the housing 9 described in this application includes a first housing 901 and a second housing 902 that are relatively closed to each other. The first housing 901 is fixedly connected to the first guide plate 1. The lateral extension length of the first housing 901 is greater than the lateral extension length of the second housing 902. The swing arm 5 extends laterally out of the second housing 902, and the magnet 6 is connected to the extended end. The Hall sensor 7 is fixed to the circuit board 8, and the circuit board 8 is connected to the lateral extension of the first housing 1. Specifically, the lower end of the first housing 901 is provided with a support leg and the first guide plate 1. The guide plate 1 is fixedly connected, while the second housing 902 is fitted to the first housing 901 through a plug-in structure and screws. The circuit board 8 can also be fixedly connected to the first housing 901 through screws or a plug-in structure, both of which are conventional housing fitting structures. With the above structure, the push rod 401 and the reset elastic element 402 can be protected inside the housing 9, while the magnet 6 on the swing arm 5 extending out of the second housing 902 can change position with the fixed Hall sensor 7. The exposed Hall sensor 7 and circuit board 8 are convenient to connect to the host signal of the sealing machine and will not be affected by other components.

[0036] As attached Figure 5-6 and Figure 10 As shown, the swing arm 5 described in this application is provided with a first rotating hole 501, and the corresponding first housing 901 is provided with a first rotating shaft 903. The first rotating hole 501 is sleeved on the first rotating shaft 903. When the housing 8 is closed, the length of the first rotating shaft 903 is close to the inner wall of the second housing 902 to prevent the swing arm from falling off. With this structure, the first rotating shaft 903 forms the rotation fulcrum of the swing arm 5. Thus, when the push rod 401 drives one end of the swing arm 5 to move up and down elastically, the other end of the magnet 6 can be stably moved up and down by the support of the fulcrum, thereby realizing the change of relative position with the Hall sensor 7.

[0037] As attached Figure 5-6 As shown, the distance between the first rotating hole 501 and the connection end of the push rod 401 is less than the distance between the connection end and the magnet 6; that is, the setting position of the first rotating hole 501 divides the swing arm 5 into left and right sections, wherein the length of the first rotating hole 501 from the push rod 401 side is less than the length from the magnet 6 end. In this way, when the swing arm 5 swings with the push rod 401, the lever arm of the magnet 6 end is longer. Even if the thickness of the plastic sealing film is slightly different, the Hall sensor 7 can accurately capture this change, thereby transmitting Hall signal values ​​of different intensities to the main board of the plastic sealing machine.

[0038] As attached Figure 5-6 and Figure 10 As shown, the push rod 401 described in this application is further provided with a second rotating shaft 404, and the swing arm 5 is provided with a second rotating hole 502. The second rotating hole 502 is located near the end of the push rod 401 and is rotatably fitted onto the second rotating shaft 404. Specifically, the second rotating shaft 404 is located below the top rod 403 and parallel to the extension direction of the top rod 403. With this structure, the swing arm 5 is rotatably connected to the push rod 401 near the push rod 401. The swing arm 5 has two rotating holes, which effectively support the magnet 6 end of the swing arm 5, enabling it to swing elastically up and down with the push rod 401 and change position with the fixed Hall sensor 7.

[0039] As attached Figure 5-6 As shown, the housing 9 of this application is provided with a sliding groove hole 904 for the push rod 401 to slide up and down. The inner contour of the sliding groove hole 904 matches the cross-section of the push rod 401. Specifically, when the first housing 901 and the second housing 902 are covered by each other, a sliding groove hole 904 for the push rod 401 to slide through is provided on each of the upper and lower opposite end faces of the complete housing 9. With this structure, the push rod 401 can slide up and down elastically in the sliding groove hole 904, which restricts the sliding trajectory of the push rod 401. In addition, as an example, the cross-section of the push rod 401 of this application can be a non-circular structure, such as a square or polygonal structure. In this way, after cooperating with the sliding groove hole 904, circumferential rotation will not occur, thereby maintaining rolling contact between the roller 10 below and the encapsulated part.

[0040] The automatic laminator described in this application operates on the following principle and process: The laminator-covered part is fed into channel 3. Driven by the traction motor inside the laminator, the laminator passes under the roller 10 located at the lower end of push rod 401. Then, push rod 401 and swing arm 5 work together to displace magnet 6. When laminators of different thicknesses amplify their travel through the lever, the relative positions of magnet 6 and Hall sensor 7 differ, generating Hall signal values ​​of varying strengths or magnitudes. The CPU built into the laminator receives these Hall signal values. Specifically, the thicker the laminator, the stronger the Hall signal value, allowing the built-in mainboard to control the rotation speed of the traction motor. The slower the speed, the longer the contact time between the molding film and the heating structure; conversely, the thinner the molding film, the smaller the Hall signal value, and the faster the mainboard controls the motor speed, resulting in a shorter contact time between the molding film and the heating structure. Therefore, only a constant temperature needs to be set. The structure described in this application allows for controlling the contact time between the molding film and the heating structure to meet different molding requirements, achieving different heating times for molding films of different thicknesses. Thus, there is no need for complex temperature adjustment structures or manual adjustment, enabling fully automated molding with better molding results. The Hall sensor 7 in this application can be a commercially available sensor structure capable of achieving the above functions, such as a Hall-effect speed sensor. The Hall sensor 7 uses the magnitude of its signal value to adjust the rotation speed of the motor, a conventional technique in the field. (Specifically, in this application, the Hall sensor 7 is connected to the control circuit (circuit board) within the laminator. The control circuit is connected to the traction motor. The Hall sensor 7 detects the magnitude of the Hall signal value generated by the change in the thickness of the laminator film due to the interaction between the magnet 6 and the Hall sensor 7. The control circuit inputs this signal to the traction motor and adjusts the speed of the drive motor based on the detected signal magnitude. The speed of the traction motor is used to control the contact time between the heating device (e.g., the output shaft of the traction motor and the heating roller) and the laminator film.) No detailed explanation is needed; the most critical innovation of this application lies in the structure formed by the interconnection and positional relationship between the elastic structure 4, the swing arm 5, the magnet 6, and the Hall sensor 7. When this structure is placed on an existing automatic laminating machine, it can sense changes in the thickness of the laminating film. Based on these changes in thickness, the position between the magnet 6 and the Hall sensor 7 can change, generating Hall signal values ​​of different magnitudes. The speed of the motor can then be controlled by the magnitude of these Hall signal values ​​to achieve a longer contact time between the thicker laminating film and the heating structure, and a shorter contact time between the thinner laminating film and the heating structure, thereby achieving the laminating requirements of different thicknesses of laminating film at a constant temperature.

Claims

1. An automatic laminator, comprising a laminator body (a), wherein the laminator body (a) has a first guide plate (1) and a second guide plate (2) arranged parallel to each other on its inlet side, and a channel (3) for forming a laminated part is provided between the first guide plate (1) and the second guide plate (2), characterized in that: The channel (3) is also provided with an elastic structure (4) that can move up and down to contact the plastic sealant. The elastic structure (4) is provided with a swing arm (5) that swings with the elastic structure (4). A magnet (6) is provided at one end of the swing arm (5). The plastic sealer body (a) is also provided with a Hall sensor (7). The Hall sensor (7) is located near the magnet (6).

2. The automatic plastic packaging machine according to claim 1, characterized in that: The elastic structure (4) includes a push rod (401) and a reset elastic element (402). The reset elastic element (402) is connected between the housing (9) and the push rod (401). The lower end of the push rod (401) abuts against the plastic sealing film. One end of the swing arm (5) is rotatably connected to the push rod (401).

3. The automatic plastic packaging machine according to claim 2, characterized in that: The first guide plate (1) is provided with a through hole (101), and the push rod (401) passes vertically through the through hole (101) to enter the channel (3).

4. The automatic plastic packaging machine according to claim 2, characterized in that: The push rod (401) is fitted with the reset elastic element (402), and the two ends of the reset elastic element (402) abut against the inner wall of the housing (9) and the top rod (403) located on the push rod (401), respectively; the top rod (403) extends along the thickness direction of the push rod (401), and the extension length of the top rod (403) is not less than the radius of the reset elastic element (402).

5. The automatic plastic packaging machine according to claim 2, characterized in that: The bottom end of the push rod (401) is provided with a roller (10), which is used to abut against the plastic sealant.

6. The automatic plastic packaging machine according to claim 2, characterized in that: The housing (9) includes a first housing (901) and a second housing (902) that are closed to each other. The first housing (901) is fixedly connected to the first guide plate (1). The lateral extension length of the first housing (901) is greater than the lateral extension length of the second housing (902). The swing arm (5) extends laterally out of the second housing (902), and the magnet (6) is connected to the extension end. The Hall sensor (7) is fixed on the circuit board (8), and the circuit board (8) is connected to the lateral extension of the first housing (901).

7. The automatic plastic packaging machine according to claim 6, characterized in that: The swing arm (5) is provided with a first rotating hole (501), and the corresponding first housing (901) is provided with a first rotating shaft (903). The first rotating hole (501) is sleeved on the first rotating shaft (903).

8. The automatic plastic packaging machine according to claim 7, characterized in that: The distance between the first rotating hole (501) and the connecting end of the push rod (401) is less than the distance between the connecting end of the push rod (6) and the connecting end of the magnet (6).

9. The automatic plastic packaging machine according to claim 8, characterized in that: The push rod (401) is also provided with a second rotating shaft (404), and the swing arm (5) is provided with a second rotating hole (502). The second rotating hole (502) is located near the end of the push rod (401), and the second rotating hole (502) is rotatably fitted onto the second rotating shaft (404).

10. The automatic plastic packaging machine according to claim 8, characterized in that: The shell (9) is provided with a sliding slot hole (904) for the up and down sliding of the push rod (401), and the inner contour of the sliding slot hole (904) matches the cross section of the push rod (401).

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