Box sealing machine and water adhesive tape box sealing method

Abstract

The application provides a sealing machine core and a water adhesive tape sealing method. The front pressing wheel and the rear pressing wheel are independently arranged and the transmission relation between them is disconnected. Before the sealing work, the front and rear pressing wheels are kept in the original position by the respective reset mechanism. In the process of pressing the tape from the front side to the top of the carton, the front pressing wheel is pushed and swings unidirectionally under the action of the forward moving carton. The front pressing wheel reset mechanism keeps the front pressing wheel pressing the tape. In the process of pressing the tape from the top to the rear side of the carton, the rear pressing wheel is driven by the reset mechanism and swings unidirectionally to the tape tail direction and keeps the rear pressing wheel pressing the tape. The application can greatly facilitate the position adjustment of the front pressing wheel and the adjustment of the rear pressing wheel by changing the relation between the front pressing wheel and the rear pressing wheel and using the air cylinder as the reset mechanism, and is widely applicable to different cartons. Meanwhile, the sealing quality of the water adhesive tape is improved and the problem of the wrinkled tape head during the sealing of the water adhesive tape is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of packaging machinery, in particular to a sealing machine core of a sealing machine, especially a sealing machine core for sealing a carton with water adhesive, and a sealing method with water adhesive. BACKGROUND

[0002] The sealing machine is a device for sealing a carton with adhesive tape. The adhesive tape is wound on the sealing machine core. When a carton to be sealed passes through the sealing machine core, the adhesive tape is used to seal the carton.

[0003] For the sealing machine core, it includes a tape pressing roller, a tape roll mounting frame and a guide roller between them. The tape pressing roller is mounted on a swing arm, and the swing arm is connected to a spring. When the carton is conveyed through the machine core, the tape head sticks to the front side of the carton, and the tape pressing roller is pushed away by the carton to compress or stretch the spring, generating pressure. As the carton moves forward, the adhesive tape is pressed flat along the tape head to the tape tail on the sealing position.

[0004] In the past, most of the structures of the machine core are that the movements of the front and rear pressing wheels are interlocked, and the reset of the rear pressing wheel needs the swing of the front pressing wheel to drive. It is difficult to adjust independently. This will cause some problems when using water adhesive tape to seal. The water adhesive tape has no adhesion before use, and has adhesion after being exposed to water. The adhesive tape becomes soft after being exposed to water, and needs a certain reaction time to have enough adhesion. The adhesion at the beginning is not as good as that of general adhesive tape. Therefore, when using the traditional sealing tape machine core to seal, the tape head part is prone to wrinkles. However, if the movement stroke of the front pressing wheel in the lifting direction of the head is adjusted to strengthen the adhesion strength of the tape head, it will affect the work of the rear pressing wheel. In addition, the traditional sealing machine core is not good for different boxes. It often needs to be directly disassembled and replaced to adapt to different boxes. SUMMARY

[0005] The first object of the present application is to provide a sealing machine core applied in a sealing machine, which can be easily adjusted, has a wider adaptability to different boxes, and can also improve the sealing quality of water adhesive tape. To this end, the present application adopts the following technical solutions:

[0006] The box sealing machine core comprises a mounting frame, a tape guide mechanism, a front pressing wheel and a rear pressing wheel, and the front pressing wheel and the rear pressing wheel are respectively mounted on their swing arms; characterized in that the front pressing wheel and the rear pressing wheel are independently arranged and disconnected in transmission relationship, and the front pressing wheel and the rear pressing wheel are connected with respective reset mechanisms; before the box sealing work is performed, the front pressing wheel and the rear pressing wheel are respectively kept at the original position by the respective reset mechanisms, in the process of pressing the tape from the front side to the top of the carton, the front pressing wheel is pushed and swings unidirectionally under the action of the forward moving carton, the front pressing wheel reset mechanism keeps the front pressing wheel pressing the tape, in the process of pressing the tape from the top to the rear side of the carton, the rear pressing wheel is driven by the reset mechanism and swings unidirectionally to the tape tail direction and keeps the rear pressing wheel pressing the tape; the reset swing of the front pressing wheel and the rear pressing wheel is driven by the respective reset mechanisms, and the rear pressing wheel reset mechanism adopts a gas cylinder.

[0007] On the basis of the above technical scheme, the application can further adopt the following technical schemes, or use the following technical schemes in combination:

[0008] The front pressing wheel reset mechanism adopts a gas cylinder, and the gas cylinder keeps the front pressing wheel at the original position and keeps the pressing force during pressing; the gas cylinders of the rear pressing wheel reset mechanism and the front pressing wheel reset mechanism each comprise a piston and a piston rod, and the gas cylinder is provided with an inlet and outlet on the front and rear sides of the piston.

[0009] The front pressing wheel is connected to the first connecting swing arm, the first connecting swing arm is connected to the gas cylinder of the front pressing wheel reset mechanism through a transmission mechanism, and the swing track during pressing is from the initial position to the tape head or beyond the tape head, and then swings in the same direction to move upward, moves upward from the front side of the carton to the top of the carton, and is slightly swung upward to be limited by the limiting structure of the reset mechanism thereof under the driving of the gas cylinder of the reset mechanism thereof.

[0010] The transmission mechanism of the front pressing wheel reset mechanism adopts a gear and rack mechanism, the first connecting swing arm is connected to a first gear, the first gear is connected to a first rack in meshing connection, and the first rack is connected to the piston rod of the gas cylinder.

[0011] The transmission mechanism of the rear pressing wheel reset mechanism adopts a gear and rack mechanism, the second connecting swing arm is connected to a second gear, the second gear is connected to a second rack in meshing connection, and the second rack is connected to the piston rod of the gas cylinder.

[0012] The core is provided with a limiting structure for the upward swing of the front pressing wheel; the limiting structure is eccentrically mounted and can adjust the limiting position by rotating.

[0013] The sealing machine core is provided with a counter and a tape cutting knife and a tape cutting knife driving mechanism, the action of the tape cutting knife driving mechanism is controlled by a controller according to the tape length calculated by the counter.

[0014] The tape feeding mechanism of the water passing assembly is located in front of the cutting knife, the tape length sensing element of the counter adopts a rotatable pressure roller, the counter is further provided with a pad cooperating with the pressure roller, the pressure roller and the pad are respectively located on both sides of the tape passing path, the counter is further provided with a swing frame and a reset spring, the pressure roller is rotatably installed on the swing frame and is pressed on the pad through the elastic force of the reset spring, the counter is further provided with a counting gear and a counting sensor, the counting gear is coaxially connected with the pressure roller to rotate synchronously, and the counting sensor is installed on the swing frame and cooperates with the counting gear.

[0015] The tape feeding mechanism comprises a tape feeding driving roller, a driven roller, a tape feeding track and a tape feeding roller driving mechanism, the tape feeding driving roller and the driven roller are located on the upper and lower sides of the tape feeding track and are used for driving the tape in the tape feeding track to advance, and the tape length sensing element is located in front of the tape feeding track; the tape feeding driven roller is arranged on a displacement driving device capable of realizing displacement of the tape feeding driven roller, so as to be pressed tightly and separated from the tape feeding driving roller.

[0016] The water passing assembly comprises a box body provided with a water tank, an L-shaped bent adhesive tape guide track is arranged on the box body, and a water suction wheel is embedded in the horizontal section of the guide track; the vertical section of the guide track is located behind the horizontal section, and a convex strip is arranged on the surface of the vertical section, so that the contact between the adhesive tape and the guide and support structure is linear contact; the box body is provided with a side tape inlet and a bottom tape outlet, and the adhesive tape guide track is located between the side tape inlet and the bottom tape outlet.

[0017] A second object of the present application is to provide a water adhesive tape sealing method applied in a sealing machine, which can improve the sealing quality of the water adhesive tape.

[0018] A water adhesive tape sealing method adopts water adhesive tape sealing, and is characterized in that the method adopts two front and rear pressure rollers for sealing, the front pressure roller and the rear pressure roller are respectively kept at original positions before sealing work is performed; the movements of the rear pressure roller and the front pressure roller are independent of each other, the rear pressure roller and the front pressure roller respectively have respective reset mechanisms, the front pressure roller reset mechanism and the rear pressure roller reset mechanism respectively apply a tape pressing force to the front pressure roller and the rear pressure roller during tape pressing;

[0019] When starting the sealing work, for the front side tape sticking of the carton, the front pressing wheel moves from the original position to the tape head direction, and the tape head is pressed flat and adhered to the front side of the carton; with the carton running forward, the front pressing wheel continues to rotate in the same direction and moves upward to the top surface of the carton, and then moves slightly upward to be limited by the limiting structure,

[0020] The rear pressing wheel contacts the carton after the front pressing wheel, and the tape is pressed flat and adhered to the top surface of the carton; for the rear side tape sticking of the carton, the rear pressing wheel is driven by the reset mechanism to actively move to the tape tail direction, and the tape is pressed flat and adhered to the rear side sealing position of the carton;

[0021] After the carton sealed is discharged, the front pressing wheel and the rear pressing wheel are driven by the reset mechanism to return to the original position, and wait for the next carton.

[0022] By adopting the technical scheme of the present application, the relationship between the front pressing wheel and the rear pressing wheel is changed, and the air cylinder is used as the reset mechanism. By maintaining the air pressure of the air cylinder and changing the pressure relationship between the two cavities on both sides of the air cylinder piston, the pressing wheel maintains the pressing force and provides the active driving force of the pressing wheel when rotating in different directions after losing the support of the carton, so that the position adjustment of the front pressing wheel and the adjustment of the rear pressing wheel can be greatly facilitated. The rear pressing wheel does not have to rely on the front pressing wheel, and can be widely used for different cartons. At the same time, the downward stroke of the front pressing wheel is improved, and the rear pressing wheel is not affected, the sealing quality of the water adhesive tape is improved, and the problem of wrinkles at the tape head during sealing of the water adhesive tape is solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the first state of the embodiment of the present application, that is, the original state. At this time, the front side of the carton just touches the front pressing wheel. Since the original position of the front pressing wheel can be higher than that of the traditional machine core structure by adopting the scheme of the present application, the downward rotating stroke of the front pressing wheel can be improved to improve the sealing quality of the water adhesive tape, and the adjustment does not affect the normal work of the rear pressing wheel by the scheme of the present application.

[0024] Figure 2 It is an evolution schematic diagram of the second state, the third state and the fourth state of the embodiment of the present application. In the second state, the front pressing wheel moves to the tape head and slightly exceeds the tape head; in the third state, with the carton conveying forward, the front pressing wheel and the rear pressing wheel press the tape on the top surface of the carton in the direction from the tape head to the tape tail; in the fourth state, with the carton conveying forward, the rear pressing wheel loses the support of the carton, and the rear pressing wheel actively runs to the tape tail on the rear side of the carton in the direction of the tape tail. Among them, S2 represents the second state, S3 represents the third state, S4 represents the fourth state, B represents the original position of the front pressing wheel, and H represents the tape head position of the tape adhered to the carton.

[0025] Figure 3 It is a schematic diagram of the embodiment of the present application.

[0026] Figure 4 The workflow schematic diagram for the front and rear pressing wheels of the present application.

[0027] Figure 5 The schematic diagram for the front pressing wheel and its driving mechanism in the embodiment of the present application.

[0028] Figure 6 The schematic diagram for the rear pressing wheel and its driving mechanism in the embodiment of the present application.

[0029] Figure 7 The overall schematic diagram for the driving part in the embodiment of the present application.

[0030] Figure 8 The schematic diagram for the counting mechanism in the embodiment of the present application.

[0031] Figure 9 The front view of the counting mechanism in the embodiment of the present application.

[0032] Figure 10 The rear side schematic diagram of the counting mechanism in the embodiment of the present application.

[0033] Figure 11 The structural explosion diagram of the water passing assembly in the embodiment of the present application.

[0034] Figure 12 The schematic diagram for the cylinder of the front and rear pressing wheel reset mechanisms in the embodiment of the present application. DETAILED DESCRIPTION

[0035] With reference to the drawings. The core of the box sealing machine provided by the present application comprises a mounting frame 100 and a tape guiding mechanism, the tape guiding mechanism is a plurality of guiding wheels 102 arranged along the tape running direction, and is installed on the mounting frame 100 through a connecting shaft, and a tape tensioning mechanism 103 is further arranged on the mounting frame. A tape reel 300 is rotatably arranged on the mounting frame 100. In the present embodiment, the tape is a water tape 301, which is a paper tape that generates viscosity after passing water.

[0036] The mechanism also includes a front pressure wheel 1 and a rear pressure wheel 2, each mounted on a swing arm. The front and rear pressure wheels 1 and 2 are separated by a front and rear design: the wheel closest to the tape's leading edge during tape sealing is the front pressure wheel 1, and the wheel closest to the tape's trailing edge is the rear pressure wheel 2. The front and rear pressure wheels 1 and 2 are independently configured and disconnected from each other. Each is connected to a respective reset mechanism. The reset mechanisms utilize cylinders 10 and 20, respectively. When not in operation, the cylinders act as gas springs, adjusting the pressure applied by the pressure wheel against the carton and extending and retracting the wheel according to the specific action. By adjusting the pressure, the force exerted on the carton can be adjusted, adapting to cartons of varying thickness and hardness. The cylinders 10 and 20 can have identical structures, each including a piston 71 and a piston extension rod 72. The cylinders are provided with air inlets and outlets 73 and 74 on the front and back sides of the piston 71.

[0037] Before the box sealing operation is performed, the front pressing wheel 1 and the rear pressing wheel 2 are respectively kept in their original positions (i.e. Figure 1 state). The cylinder 10 of the front pressure wheel reset mechanism is preset with a certain pressure. In the process of pressing the belt from the front side to the top surface of the carton, under the action of the forward moving carton, the front pressure wheel is pushed and swings unidirectionally, and the front pressure wheel reset mechanism moves passively. The cylinder pressure of the front pressure wheel reset mechanism enables the front pressure wheel 1 to maintain pressure on the belt. The cylinder 20 of the rear pressure wheel reset mechanism is preset with a certain pressure, so that the rear pressure wheel 2 maintains pressure on the belt, and in the process of pressing the belt from the top surface to the rear side of the carton, the rear pressure wheel 2 is driven forward by the reset mechanism and swings unidirectionally toward the tail of the belt. The reset swing of the front pressure wheel 1 and the rear pressure wheel 2 is driven by their respective reset mechanisms. After the sealed carton leaves, the front pressure wheel 1 and the rear pressure wheel 2 are driven by their respective drive mechanisms to return to their original positions, waiting for the next carton.

[0038] The front pressure wheel 1 is connected to the first connecting swing arm 11, which is connected to the cylinder 10 of the front pressure wheel reset mechanism through the transmission mechanism. The swing trajectory of the front pressure wheel 1 when pressing the belt is from the initial position downward to the belt head or beyond the belt head ( Figure 2 Then it swings in the same direction and moves upward, from the front side of the carton to the top of the carton ( Figure 2 (The state position of S3 in the figure) preferably, by adopting the separate driving scheme of the present invention, the first connecting swing arm 11 (front pressure wheel 1) can be driven by the cylinder 10 of its reset mechanism and swing slightly upward until it is limited by its limiting structure. At this time, the front pressure wheel 1 is in a state of reducing downward pressure; in this way, even if the downward stroke of the front pressure wheel 1 increases, when it moves upward to the top surface of the carton, the carton structure will not be affected by excessive pressure.

[0039] The limiting structure 81 can be used for the first connecting swing arm 11 or other synchronous rotating parts with the first connecting swing arm 11, in the embodiment, the limiting structure 81 is an eccentric wheel, which can adjust the limiting position by rotating, so as to adjust the angle of upward swinging of the front pressing wheel 1 and the height of the front pressing wheel 1 relative to the top surface of the carton, and adapt to cartons with different heights and materials. The machine core is also provided with a limiting structure 82 for upward swinging of the rear pressing wheel; and the structure and mounting mode thereof can also adopt the scheme of the limiting structure 81.

[0040] The rear pressing wheel 2 is connected to the second connecting swing arm 21, the second connecting swing arm 21 is connected to the cylinder 20 through a transmission mechanism and a rear pressing wheel reset mechanism, the first connecting swing arm 11 and the second connecting swing arm 21 rotate independently; in the height direction, the rear pressing wheel 2 is located above the front pressing wheel 1 when being in the original position, and in the horizontal direction, the front pressing wheel 1 is located in front of the rear pressing wheel 2, and is located in the position of contacting the front side of the carton first.

[0041] As shown in Figure 4 , for the front side tape sticking of the carton, the front pressing wheel 1 mainly performs tape pressing (i.e. Figure 4 , the front pressing wheel moves downward and then upward), and the rear pressing wheel 2 can basically not perform tape pressing on the front side 201 of the carton 200, and for the rear side tape sticking of the carton, the rear pressing wheel 2 is completed, and the front pressing wheel 1 can basically not perform tape pressing on the rear side 202 of the carton 200. The reference sign 203 is the carton seam between the top flaps of the carton to be sealed in the embodiment. The lower part of the mounting frame 100 is provided with a pressing plate 101 for pressing the flaps on both sides of the carton seam, so as to provide a relatively flat basis for tape sticking.

[0042] In summary, as shown in Figure 4 , in the tape pressing work, the movement track of the front pressing wheel 1 is A-B-C-D, and the movement track of the rear pressing wheel 2 is C-E or D-E.

[0043] It should be noted that in the present application, the upward and downward movement of the top surface of the carton, the front pressing wheel and the rear pressing wheel is defined with the position of the machine core as the reference datum, in the up-down direction, the movement away from the machine core is downward movement, and the movement close to the machine core is upward movement, and the top surface of the carton is the surface close to the machine core and needing to be sealed.

[0044] The transmission mechanism adopts a gear and rack mechanism, which can make the first connecting swing arm 11 and the second connecting swing arm 21 more stably obtain the function of the gas spring provided by the cylinder. Due to the position change of the carton, the preset pressure and the resisting position of the carton change, and the racks can respond and displace.

[0045] Specifically, the first connecting swing arm 11 is connected with the first gear 12, the gear shaft is the swing center of the first connecting swing arm 11, the first gear 12 is connected with the first gear rack 13 in meshing mode, and the mounting frame 14 of the first gear rack 13 is connected with the air cylinder 10. The second connecting swing arm 21 is connected with the second gear 22, the gear shaft is the swing center of the second connecting swing arm 21, the second gear 22 is connected with the second gear rack 23 in meshing mode, and the mounting frame 24 of the second gear rack 23 is connected with the air cylinder 20. The gear racks 13 and 23 are horizontally arranged, and the limiting pressure wheels 15 and 25 are arranged above the gear racks 13 and 23 to prevent the gear racks from being upwarped and ensure the stable operation of the air cylinders and prevent the air cylinders from being damaged. The mounting frame can be provided with the limiting part of the first connecting swing arm 11 to limit the lifting angle of the first swing arm. For the reset position, the initial connection position between the gear and the gear rack can be flexibly determined to adjust the initial position (the negative distance and the pressure of the pressure wheels acting on the surface of the carton) according to the specific conditions (the thickness, softness and hardness) of the carton, and the adjustment is flexible and convenient.

[0046] The sealing machine core is provided with a counter, a cutting knife 3 and a cutting knife driving mechanism. The action of the cutting knife driving mechanism is controlled by the controller according to the tape length calculated by the counter. Through accurate counting, the accurate length can be cut, and the technical effect and efficiency generated by the independent movement of the front and rear pressure wheels are improved. The counter is provided with a tape sensing element. The tape sensing element adopts a rotatable pressure wheel 51. The counter is also provided with a pad 52 matched with the pressure wheel 51. The pressure wheel 51 and the pad 52 are respectively located on both sides of the adhesive tape running path. The counter is also provided with a swing frame 53 and a reset spring 54. The swing frame is rotatably installed on the mounting frame 100 or a part fixed to the machine frame. The reset spring 54 is connected between the swing frame and the mounting frame 100. The pressure wheel 51 is rotatably installed on the swing frame 53 and is pressed on the pad 52 by the elastic force of the reset spring 54. The counter is also provided with a counting gear 55 and a counting sensor 56. The counting gear 55 is coaxially connected with the pressure wheel 51 to rotate synchronously. The counting sensor 56 is installed on the swing frame and is matched with the counting gear. The counting signal of the counting sensor 56 is transmitted to the controller of the cutting knife driving mechanism. The cutting knife driving mechanism can adopt a cylinder 31 and a connecting rod mechanism 32 to drive the cutting knife 3 to swing up and down.

[0047] The machine core is provided with an adhesive tape water passing assembly 400 and a tape feeding mechanism. The adhesive tape water passing assembly is located behind the cutting knife 3, and the tape feeding mechanism is located in front of the cutting knife 3.

[0048] The tape feeding mechanism comprises a tape feeding driving roller 41, a driven roller 42, a tape feeding track 43 and a tape feeding roller driving mechanism (such as a motor) for driving the tape feeding driving roller 41 to rotate, the tape feeding driving roller 41 and the driven roller 42 are located on the upper and lower sides of the tape feeding track 43 for driving the tape 301 passing through the tape feeding track 43 to advance, and the tape feeding driven roller is arranged on a displacement driving device capable of realizing displacement with the tape feeding driven roller, so as to be pressed and separated with the driving roller, and the displacement driving device can adopt a cylinder 44 and a connecting rod mechanism 45 to drive the tape feeding driven roller 42 to swing up and down.

[0049] The water passing assembly 400 comprises a box body provided with a water tank 63, an L-shaped bent adhesive tape guide track 61 is arranged on the box body, a water absorbing wheel 62 is embedded in the horizontal section of the guide track, the surface of the water absorbing wheel 62 is wrapped with sponge and can absorb water in the water tank 63; the vertical section of the guide track 61 is located behind the horizontal section, the surface of the vertical section is provided with a convex strip 64, so that the contact between the adhesive tape 200 and the guide and support structure is linear contact; the box body is provided with a side tape inlet and a bottom tape outlet, and the adhesive tape guide track 61 is located between the side tape inlet and the bottom tape outlet. The number 65 is the water inlet of the water tank.

[0050] Unless otherwise specified and limited, in the present application, if the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial" and the like indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore the orientation or positional relationship described in the present application is only used for exemplary description, and cannot be understood as a limitation on the present patent, and for those skilled in the art, the specific meaning of the above terms can be understood in combination with the drawings and according to the specific situation.

[0051] Unless otherwise specified and limited, in the present application, if the terms "arranged", "clamped" and "connected" are broadly understood, for example, they can be fixedly connected, or detachably connected, or integrally connected; they can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0052] The above description is only a specific embodiment of the present application, but the structural characteristics of the present application are not limited to this, and any changes or modifications made by those skilled in the art within the scope of the present application are covered by the protection scope of the present application.

Claims

1. A carton sealing mechanism, comprising a mounting frame, a tape guide mechanism, a front pressure wheel and a rear pressure wheel, wherein the front pressure wheel and the rear pressure wheel are respectively mounted on their swing arms; The front pressing wheel and the rear pressing wheel are independently arranged and the transmission relationship between them is disconnected, and the front pressing wheel and the rear pressing wheel are connected to their respective reset mechanisms; before the box sealing work is carried out, the front pressing wheel and the rear pressing wheel are respectively kept in their original positions by their respective reset mechanisms, and in the process of pressing the tape from the front side to the top surface of the carton, under the action of the forward moving carton, the front pressing wheel is pushed and unidirectionally swings, and the front pressing wheel reset mechanism enables the front pressing wheel to maintain pressure on the tape, and in the process of pressing the tape from the top surface to the rear side of the carton, the rear pressing wheel is driven forward by the reset mechanism to unidirectionally swing toward the tape tail direction and maintain pressure on the rear pressing wheel to the tape; the reset swing of the front pressing wheel and the rear pressing wheel are driven by their respective reset mechanisms, and the rear pressing wheel reset mechanism adopts a cylinder; The front pressure roller reset mechanism adopts a cylinder, and uses the cylinder to keep the front pressure roller in its original position and maintain the pressure when pressing the belt; the cylinders of the rear pressure roller reset mechanism and the front pressure roller reset mechanism both include a piston and a piston extension rod, and the cylinders are provided with air inlets and outlets on the front and rear sides of the piston; The front pressing wheel is connected to the first connecting swing arm, which is connected to the cylinder of the front pressing wheel reset mechanism through the transmission mechanism. The swing trajectory when pressing the belt is to swing downward from the initial position to the belt head or beyond the belt head, and then swing in the same direction and move upward, from the front side of the carton to the top surface of the carton, and then be driven by the cylinder of its reset mechanism to swing slightly upward until it is limited by its limit structure; the movement is provided with a limit structure for the upward swing of the front pressing wheel; the limit structure is eccentrically installed and can adjust the limit position by rotation; The rear pressure wheel is connected to the second connecting swing arm, and the second connecting swing arm is connected through a transmission mechanism and a cylinder of the rear pressure wheel reset mechanism; in the height direction, when in the original position, the rear pressure wheel is located above the front pressure wheel, and in the horizontal direction, the front pressure wheel is located in front of the rear pressure wheel, and is in a position to first contact the front side of the box.

2. The carton sealing machine core according to claim 1, characterized in that The transmission mechanism of the front pressure wheel reset mechanism adopts a gear rack mechanism, the first connecting swing arm is connected to the first gear, the first gear and the first rack are meshed and connected, and the first rack is connected to the cylinder piston rod.

3. The carton sealing machine core according to claim 1, characterized in that The transmission mechanism of the rear pressure wheel reset mechanism adopts a gear rack mechanism, the second connecting swing arm is connected to the second gear, the second gear and the second rack are meshed and connected, and the second rack is connected to the cylinder piston rod.

4. The carton sealing mechanism according to claim 1, characterized in that The carton sealing machine core is provided with a counter, a tape cutter and a tape cutter driving mechanism. The counter is provided with a tape running sensor element. The action of the tape cutter driving mechanism is controlled by a controller according to the tape running length calculated by the counter.

5. The carton sealing machine core according to claim 4, characterized in that The machine core is provided with a tape water-passing assembly and a tape feeding mechanism. The tape water-passing assembly is located behind the tape cutting knife, and the tape feeding mechanism is located before the tape cutting knife.

6. The carton sealing machine core according to claim 4, characterized in that The tape-feeding sensing element of the counter adopts a rotatable pressure wheel. The counter is also provided with a pad that cooperates with the pressure wheel. The pressure wheel and the pad are respectively located on both sides of the tape-feeding path. The counter is also provided with a swing frame and its reset spring. The pressure wheel is rotatably mounted on the swing frame and is pressed on the pad by the elastic force of the reset spring. The counter is also provided with a counting gear and a counting sensor. The counting gear is coaxially connected to the pressure wheel and rotates synchronously. The counting sensor is mounted on the swing frame and cooperates with the counting gear.

7. The carton sealing machine core according to claim 5, characterized in that The belt feeding mechanism includes a belt feeding active roller, a belt feeding driven roller, a belt feeding track and a belt feeding roller driving mechanism. The belt feeding active roller and the belt feeding driven roller are located on the upper and lower sides of the belt feeding track and are used to drive the adhesive tape in the belt feeding track forward. The belt running sensing element is located in front of the belt feeding track; the belt feeding driven roller is arranged on a displacement driving device that can achieve displacement with it so as to be pressed and disengaged from the belt feeding active roller.

8. The carton sealing machine core according to claim 5, characterized in that The water-passing assembly includes a box body with a water trough, an L-shaped bent tape guide track is provided on the box body, and a water suction wheel is embedded in the horizontal section of the guide track; the vertical section of the guide track is located behind the horizontal section, and a convex strip is provided on its surface, so that the contact between the tape and its guide support structure is a line contact; the box body is provided with a side tape inlet and a bottom tape outlet, and the tape guide track is located between the side tape inlet and the bottom tape outlet.

9. A method for sealing a carton with a water-based tape, wherein: A carton sealing mechanism according to any one of claims 1 to 8 is used, wherein the method uses two front and rear pressure wheels for carton sealing, wherein the front pressure wheel and the rear pressure wheel are respectively maintained in their original positions before the carton sealing operation is performed; the movements of the rear pressure wheel and the front pressure wheel are independent of each other, and the rear pressure wheel and the front pressure wheel respectively have their own reset mechanisms, and when pressing the belt, the front pressure wheel reset mechanism and the rear pressure wheel reset mechanism respectively apply a pressing force to the front pressure wheel and the rear pressure wheel; When the carton sealing work begins, for the tape pasting on the front side of the carton, the front pressing wheel moves from its original position toward the tape head, pressing the tape head flat against the front side of the carton; as the carton moves forward, the front pressing wheel continues to rotate in the same direction, moves upward to the top surface of the carton, and then moves slightly upward until it is limited by its limiting structure. The rear pressing wheel contacts the carton after the front pressing wheel, flattening the tape and sticking it to the top surface of the carton; for taping the rear side of the carton, the rear pressing wheel is driven by its reset mechanism to actively move towards the tape tail, flattening the tape and sticking it to the rear side of the carton at the sealing position; After the sealed carton leaves, the front and rear pressing wheels are driven by their respective reset mechanisms to return to their original positions, waiting for the next carton.

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