Packaging box film covering device

Abstract

The invention relates to the technical field of packaging film covering, and discloses a packaging box film covering device which comprises a main machine frame, a fixed mold, a hot-pressing movable mold and a driving mechanism, the fixed mold is fixed to the main machine frame, and the hot-pressing movable mold is movably installed on the main machine frame and is in transmission connection with the driving mechanism; a positioning groove is formed in the fixed mold, and a first sealing part is further arranged on the upper side face of the fixed mold; a protruding part is arranged on the lower portion of the hot-pressing movable die in a floating mode and matched with the positioning groove in a concave-convex mode, the hot-pressing movable die is further provided with a second sealing part, and the first sealing part is matched with the second sealing part in a press fit mode. A heating piece is arranged in the protruding part, a blowing hole is formed in the lower surface of the protruding part, a blowing pipe is arranged in the hot-pressing movable die, one end of the blowing pipe is connected with the blowing hole, and the other end of the blowing pipe is connected with an air compressor. The air blowing holes release high-pressure airflow to form an air cushion layer between the film and the protruding part, airflow counter-acting force is converted into driving force of floating mold splitting, the situation that an inner cavity covering film is prone to adhesion is avoided, and a smooth and complete sealing protection layer can be formed in a packaging box in an attached mode.

Description

Technical Field

[0001] The invention relates to the technical field of packaging film laminating, and in particular to a packaging box film laminating device. Background Art

[0002] At present, packaging box lamination is a common packaging processing technology. By covering the surface of the packaging box with a transparent or sealing film, it can not only prevent the printed layer from being scratched or faded, but also effectively block external moisture and humidity, thereby extending the shelf life of the contents.

[0003] For example, a Chinese invention patent with authorization announcement number CN112977976B and authorization announcement date 2022.06.28 discloses an automatic film laminating device for packaging boxes, including a fixed plate, a No. 1 fixed shaft, a No. 2 fixed shaft, a No. 5 fixed shaft, a No. 3 fixed shaft, a No. 6 fixed shaft and a rotating shaft are vertically installed on the fixed plate from the feed end to the discharge end, and a No. 1 conveying mechanism, a film passing bin and a No. 2 conveying mechanism are arranged on one side of the fixed plate in sequence, a pressing plate is installed below the No. 6 fixed shaft, and a welding rod box channel is formed between the pressing plate and the film passing bin, and a film heating device is arranged below the film passing bin; a cutter is installed below the rotating shaft, and the cutter is located above the No. 2 conveying mechanism, and the rotating shaft is connected to the driving mechanism. The film passing bin is a U-shaped groove structure, and a gap is arranged in the middle of the film passing bin, so that the heat of the film heating device can be transferred to the welding rod box through the gap, and the bottom of the welding rod box is coated and thermoformed.

[0004] In practical applications, solid food, fruits, sanitary products, etc. need to be packaged in paper boxes. These contents contain water and grease, which are easy to infiltrate and penetrate the paper boxes. Long-term storage may cause the paper components of the boxes to adhere. The existing automatic film-coating device for packaging boxes is used to coat the outside of welding rod boxes, but cannot effectively coat the inner wall of the packaging box, and cannot form a smooth and complete sealing protective layer on the inner wall of the packaging box. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing automatic film-covering device for packaging boxes cannot effectively cover the inner wall of the packaging box and cannot form a smooth and complete sealing protective layer on the inner wall of the packaging box.

[0006] In order to solve the above technical problems, the present invention provides a technical solution for a packaging box laminating device:

[0007] The packaging box laminating device comprises a main frame, a fixed mold, a hot pressing movable mold and a driving mechanism, wherein the fixed mold is fixedly mounted on the main frame, the hot pressing movable mold is movably mounted on the main frame, and the driving mechanism is transmission-connected between the hot pressing movable mold and the main frame;

[0008] The fixed mold is provided with a positioning groove for accommodating and cooperating with the packaging box. The upper side surface of the fixed mold is also provided with a first sealing portion, which is arranged around the outside of the positioning groove;

[0009] A protruding portion is floatingly arranged at the lower part of the hot pressing moving mold. The protruding portion is in concave-convex fit with the positioning groove. The hot pressing moving mold is also provided with a second sealing portion, which is arranged around the outside of the protruding portion. The first sealing portion and the second sealing portion are press-fitted and matched;

[0010] A heating element is also arranged inside the protruding portion, and the heating element is dispersedly arranged around the outer surface of the protruding portion. An air blowing hole is opened on the lower surface of the protruding portion. An air blowing pipe is arranged inside the hot pressing moving mold. One end of the air blowing pipe is connected to the air blowing hole, and the other end of the air blowing pipe is connected to an air compressor.

[0011] Furthermore, a guiding groove is opened inside the hot pressing moving mold. The protruding portion is slidably and sealingly installed in the guiding groove, and an elastic member is also arranged between the protruding portion and the bottom of the guiding groove. The elastic member is in downward pressing fit with the protruding portion to elastically extrude the positioning groove by the protruding portion.

[0012] Furthermore, the floating range of the protruding portion relative to the hot pressing moving mold is 0 - 25 mm, and the minimum floating air pressure of the protruding portion is 0.12 Mpa - 0.2 Mpa.

[0013] Furthermore, the air blowing hole is a flared opening, and the opening of the air blowing hole gradually expands from top to bottom. The maximum opening diameter of the air blowing hole is D, satisfying: D ≤ 25 mm.

[0014] Furthermore, the shape of the protruding portion is a quadrangular prism, and a chamfering portion is arranged at the bottom corner of the protruding portion. The chamfering portion is inclined relative to the lower surface of the protruding portion, and the chamfering portion and the inner angle of the positioning groove are spaced apart.

[0015] Furthermore, an auxiliary air hole is opened in the chamfering portion, and a gas branch pipe is connected between the auxiliary air hole and the air blowing pipe.

[0016] Furthermore, a plurality of heat conducting plates are detachably installed outside the protruding portion. The heating element is arranged inside the heat conducting plates. The plurality of heat conducting plates are spliced and combined according to the circumferential profile of the protruding portion, and the heat conducting plates are flush with the outer surface of the protruding portion.

[0017] Furthermore, the heating element is an electric heating wire, and the electric heating wire extends in a spiral or S shape. The heating element is in contact fit with the heat conducting plate. The heat conducting plate is a copper heat conducting plate, and the minimum thickness of the heat conducting plate ≥ 5 mm.

[0018] Further, a pressure sensor is provided near the air blowing hole of the air blowing pipe, and a solenoid valve is also provided near the air compressor of the air blowing pipe. The pressure sensor is used to detect the blowing pressure in real time.

[0019] The packaging box film laminating device further includes a controller, which is electrically connected to the pressure sensor and the solenoid valve respectively. The controller is provided with a pressure threshold. The controller is used to receive the blowing pressure signal and control the solenoid valve to close when the blowing pressure exceeds the pressure threshold.

[0020] Further, the first sealing portion is an annular retaining edge, which protrudes from the upper side surface of the fixed mold. The second sealing portion is an annular groove, and at least two sealing rings are embedded in the annular groove. The at least two sealing rings are arranged in concentric circles, and the at least two sealing rings are respectively in sealing cooperation with the upper surface of the annular retaining edge.

[0021] Compared with the prior art, a packaging box film laminating device of the present invention has the beneficial effects that: the packaging box film laminating device adopts the design form of a main frame, a fixed mold, a hot pressing moving mold and a driving mechanism. The fixed mold is fixedly installed on the main frame, and the hot pressing moving mold is movably installed on the main frame. The hot pressing moving mold is driven by the driving mechanism to perform the mold closing / mold opening action. The fixed mold is provided with a positioning groove, and a protruding portion is floatingly arranged at the lower part of the hot pressing moving mold. In the initial stage of hot pressing, the floating installation design of the protruding portion can absorb the vertical pressure applied by the driving mechanism, buffer the contact force between the protruding portion and the positioning groove of the fixed mold, and ensure the uniform distribution of the hot pressing pressure, preventing hard contact and local overpressure from causing film rupture or packaging box damage. It is suitable for the film laminating of paper packaging boxes and improves the qualified rate.

[0022] Among them, a first sealing portion is provided on the upper side surface of the fixed mold, and the first sealing portion surrounds the outside of the positioning groove. The hot pressing moving mold is also provided with a second sealing portion, and the second sealing portion surrounds the outside of the protruding portion. When the hot pressing mold is closed, the first sealing portion and the second sealing portion are pressed together to form a closed space, which can prevent the hot melt film material from overflowing and can construct a pressure chamber for hermetically gathering gas between the protruding portion and the positioning groove. Moreover, a heating element is provided inside the protruding portion, and the heating element is distributed around the protruding portion. Before hot pressing, the film is pre-placed in the packaging box. When the hot pressing moving mold is pressed down to close the mold, the film is quickly heated and shaped at the same time. The temperature of the film laminating area can be accurately controlled by the heating elements uniformly distributed on the outer surface of the protruding portion, avoiding film over-melting and damage or failure to reach the hot melt film laminating state due to uneven temperature distribution, and achieving the purpose of effectively laminating the inner wall of the packaging box.

[0023] In addition, the lower surface of the protrusion is provided with a blowing hole, which is connected to the air compressor through a blowing pipe. During the demolding stage, the blowing hole releases high-pressure airflow to form an air cushion layer between the film and the protrusion. The reaction force of the airflow is converted into a driving force for the protrusion to float upward and separate from the mold. When the air pressure reaches the set threshold, the protrusion automatically floats up under the push of the air pressure, realizing the progressive separation of the protrusion and the film. It is the design of air-blowing separation and demolding that not only eliminates the need for an additional ejection mechanism, but also has no mechanical contact throughout the process, avoiding the risk of pulling caused by mechanical ejector demolding, and eliminating the problem of demolding scratches or stretching deformation. Moreover, the synergistic effect of the air cushion layer and the floating jacking causes the protrusion to suspend and separate from the film, and the airflow can penetrate at multiple angles along the inner bottom surface of the protrusion, ensuring that the film in the deep cavity area is separated without dead angles, solving the problem of easy adhesion of the inner cavity coating, and can form a smooth and complete sealing protective layer attached to the inner wall of the packaging box. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a front view schematic diagram of a packaging box laminating device in an embodiment of the present invention;

[0025] Figure 2 It is a cross-sectional schematic diagram of a fixed mold and a hot pressing movable mold of a packaging box laminating device in an embodiment of the present invention;

[0026] Figure 3 is a cross-sectional schematic diagram of a hot pressing movable die of a packaging box laminating device in an embodiment of the present invention;

[0027] Figure 4 yes Figure 3 A partial enlarged view of the protruding portion of the hot pressing movable die;

[0028] Figure 5 is a three-dimensional schematic diagram of a protruding portion of a hot pressing movable mold in an embodiment of the present invention;

[0029] Figure 6 is a control principle diagram of a packaging box laminating device in an embodiment of the present invention;

[0030] In the figure: 1. main frame; 2. fixed mold; 20. positioning groove; 21. first sealing part; 3. hot pressing movable mold; 30. protrusion; 301. heating element; 302. blowing hole; 303. blowing pipe; 304. chamfered part; 305. auxiliary air hole; 306. gas branch pipe; 307. heat conduction plate; 308. pressure sensor; 31. second sealing part; 32. guide groove; 33. elastic part; 35. sealing ring; 4. driving mechanism; 5. controller; 51. solenoid valve. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figures 1 to 6 As shown, a packaging box laminating device according to an embodiment of the present invention comprises a main frame 1, a fixed mold 2, a hot pressing movable mold 3 and a driving mechanism 4, wherein the fixed mold 2 is fixedly mounted on the main frame 1, the hot pressing movable mold 3 is movably mounted on the main frame 1, and the driving mechanism 4 is transmission-connected between the hot pressing movable mold 3 and the main frame 1; the fixed mold 2 is provided with a positioning groove 20, the positioning groove 20 is used to accommodate and cooperate with the packaging box, and the upper side surface of the fixed mold 2 is also provided with a first sealing portion 21, and the first sealing portion 21 is arranged around the outer side of the positioning groove 20.

[0036] The lower part of the hot-pressing moving die 3 is floatingly provided with a protruding part 30, and the protruding part 30 is in concave-convex fit with the positioning groove 20. The hot-pressing moving die 3 is also provided with a second sealing part 31, and the second sealing part 31 is arranged around the outside of the protruding part 30. The first sealing part 21 and the second sealing part 31 are press-fitted and matched; a heating element 301 is also arranged inside the protruding part 30, and the heating element 301 is dispersedly arranged around the outer surface of the protruding part 30; an air blowing hole 302 is opened on the lower surface of the protruding part 30, and an air blowing pipe 303 is arranged inside the hot-pressing moving die 3. One end of the air blowing pipe 303 is connected to the air blowing hole 302, and the other end of the air blowing pipe 303 is connected to an air compressor.

[0037] The film laminating device for the packaging box adopts the design form of a main frame 1, a fixed die 2, a hot-pressing moving die 3 and a driving mechanism 4. The fixed die 2 is fixedly installed on the main frame 1, and the hot-pressing moving die 3 is movably installed on the main frame 1. The driving mechanism 4 drives the hot-pressing moving die 3 to perform the mold closing / mold opening action. The fixed die 2 is provided with a positioning groove 20, and the lower part of the hot-pressing moving die 3 is floatingly provided with a protruding part 30. In the initial stage of hot pressing, the floating installation design of the protruding part 30 can absorb the vertical pressure applied by the driving mechanism 4, buffer the contact force between the protruding part 30 and the positioning groove 20 of the fixed die 2, and ensure the uniform distribution of the hot-pressing pressure, preventing hard contact and local overpressure from causing film rupture or damage to the packaging box. It is suitable for the film laminating of paper packaging boxes and improves the qualified product rate.

[0038] Among them, the upper side surface of the fixed die 2 is provided with a first sealing part 21, and the first sealing part 21 is arranged around the outside of the positioning groove 20. The hot-pressing moving die 3 is also provided with a second sealing part 31, and the second sealing part 31 is arranged around the outside of the protruding part 30. When the hot pressing is performed and the mold is closed, the first sealing part 21 and the second sealing part 31 are press-fitted to form a sealed space, which can prevent the hot-melt film material from overflowing and can construct a pressure chamber for sealing and gathering gas between the protruding part 30 and the positioning groove 20. Moreover, a heating element 301 is arranged inside the protruding part 30, and the heating element 301 is dispersedly arranged around the protruding part 30. Before hot pressing, the film is pre-placed in the packaging box. When the hot-pressing moving die 3 presses down and closes the mold, the film is quickly heated and shaped at the same time. The temperature of the film laminating area can be accurately controlled by the heating element 301 evenly distributed on the outer surface of the protruding part 30, avoiding over-melting and damage of the film caused by uneven temperature distribution or failure to reach the hot-melt film laminating state, and achieving the purpose of effectively laminating the inner wall of the packaging box.

[0039] In addition, air blowing holes 302 are formed on the lower surface of the protruding part 30. The air blowing holes 302 are connected to an air compressor through an air blowing pipe 303. During the demolding stage, the air blowing holes 302 release high-pressure air flow to form an air cushion layer between the film and the protruding part 30. The reaction force of the air flow is converted into a driving force for the protruding part 30 to float upward for demolding. When the air pressure reaches the set threshold value, the protruding part 30 automatically floats upward under the push of the air pressure, realizing the gradual separation of the protruding part 30 from the film. It is precisely the design of air blowing separation demolding that not only eliminates the need for an additional ejection mechanism, has no mechanical contact throughout the process, avoids the pulling risk caused by mechanical ejector rod demolding, and eliminates the problems of demolding scratches or stretching deformation. Moreover, the synergistic effect of the air cushion layer and floating lifting enables the protruding part 30 to be suspended and separated from the film, and the air flow can penetrate at multiple angles along the bottom surface of the protruding part 30, ensuring the separation of the film in the deep cavity area without dead corners, solving the problem of easy adhesion of the inner cavity film, and forming a smooth and complete sealing protection layer on the inner wall of the packaging box.

[0040] In this embodiment, a guiding groove 32 is formed inside the hot pressing moving die 3. The protruding part 30 is slidably and hermetically installed in the guiding groove 32, and an elastic member 33 is further provided between the protruding part 30 and the bottom of the guiding groove 32. The elastic member 33 is in downward pressing fit with the protruding part 30 to elastically squeeze the positioning groove 20 by the protruding part 30. The sliding and hermetic assembly of the protruding part 30 and the guiding groove 32 ensures the integrity of the closed space, avoids the failure of the reaction force of the air flow due to gas leakage, and generates a hot pressing force on the protruding part 30 through the elastic member 33, ensuring the balanced contact pressure between the protruding part 30 and the packaging box and the film.

[0041] Specifically, the floating range of the protruding part 30 relative to the hot pressing moving die 3 is 0 - 25 mm, and the minimum floating air pressure of the protruding part 30 is 0.12 Mpa - 0.2 Mpa. The air flow demolding of the protruding part 30 is only a pre-separation process, and the driving mechanism 4 still needs to drive the hot pressing moving die 3 to complete the subsequent separation action. The minimum pressure during hot pressing and film laminating of the protruding part 30 is positively correlated with the minimum floating air pressure of the protruding part 30. The minimum floating air pressure of the protruding part 30 can be selected as 0.12 Mpa, 0.15 Mpa, 0.18 Mpa or 0.2 Mpa, or any other pressure between 0.12 Mpa and 0.2 Mpa, which can ensure the reliability of film laminating on the inner wall of the packaging box.

[0042] Among them, the air blowing hole 302 is a trumpet-shaped opening, and the air blowing hole 302 is arranged with an opening gradually expanding from top to bottom. The maximum opening diameter of the air blowing hole 302 is D, satisfying: D ≤ 25 mm. The air blowing hole 302 adopts the design of a trumpet-shaped opening, and the air flow has a better expanding trend along the bottom surface to the surroundings. The maximum opening diameter D of the air blowing hole 302 ≤ 25 mm, and the small opening area ensures more complete hot pressing and film laminating at the bottom.

[0043] As a further preferred solution, the shape of the protruding portion 30 is a quadrangular prism, and a chamfering portion 304 is provided at the bottom corner of the protruding portion 30. The chamfering portion 304 is arranged obliquely with respect to the lower surface of the protruding portion 30, and the chamfering portion 304 and the inner angle of the positioning groove 20 are distributed at intervals. Moreover, the four edges and four bottom sides of the protruding portion 30 are all designed with rounded corners to prevent the film from being cut or punctured due to sharp corners. In addition, an auxiliary air hole 305 is formed in the chamfering portion 304, and a gas branch pipe 306 is connected between the auxiliary air hole 305 and the air blowing pipe 303. The chamfering portion 304 reserves an air flow expansion space for the auxiliary air hole 305.

[0044] It should be noted that a plurality of heat conducting plates 307 are detachably installed outside the protruding portion 30, and the heating element 301 is arranged inside the heat conducting plates 307. The plurality of heat conducting plates 307 are spliced and combined according to the circumferential contour of the protruding portion 30, and the heat conducting plates 307 are arranged flush with the outer surface of the protruding portion 30. Specifically, the heating element 301 is an electric heating wire, and the electric heating wire extends in a spiral or S shape. The heating element 301 is in contact and cooperation with the heat conducting plates 307. The heat conducting plates 307 are copper heat conducting plates, and the minimum thickness of the heat conducting plates 307 ≥ 5 mm. The copper heat conducting plates play a role in efficient heat conduction, and the greater the thickness, the more balanced the heat conduction, ensuring the reliability of the film hot melting change.

[0045] In addition, a pressure sensor 308 is provided near the air blowing hole 302 of the air blowing pipe 303, and a solenoid valve 51 is also provided near the air compressor of the air blowing pipe 303. The pressure sensor 308 is used to detect the blowing pressure in real time; the packaging box film laminating device further includes a controller 5. The controller 5 is electrically connected to the pressure sensor 308 and the solenoid valve 51 respectively. The controller 5 is provided with a pressure threshold value. The controller 5 is used to receive the blowing pressure signal and control the solenoid valve 51 to close when the blowing pressure exceeds the pressure threshold value. The pressure threshold value of the controller is slightly greater than the minimum floating air pressure of the protruding portion 30. For example: the pressure threshold value is any pressure between 0.13 Mpa and 0.21 Mpa, which can prevent the hot melting film from being damaged due to excessive instantaneous blowing pressure.

[0046] As a further preferred solution, the first sealing portion 21 is an annular retaining edge, and the annular retaining edge protrudes from the upper side surface of the fixed mold 2. The second sealing portion 31 is an annular groove, and at least two sealing rings 35 are embedded in the annular groove. The at least two sealing rings 35 are arranged in concentric rings, and the at least two sealing rings 35 are respectively in sealing cooperation with the upper surface of the annular retaining edge. Through the concave-convex cooperation between the first sealing portion 21 of the fixed mold 2 and the second sealing portion 31 of the hot pressing moving mold 3, the mold closing position accuracy is improved. Combining the arrangement of at least two sealing rings 35 in concentric rings ensures the reliable sealing of the closed space during hot pressing.

[0047] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A packaging box laminating device, characterized in that: The invention comprises a main frame (1), a fixed mold (2), a hot pressing movable mold (3) and a driving mechanism (4), wherein the fixed mold (2) is fixedly mounted on the main frame (1), the hot pressing movable mold (3) is movably mounted on the main frame (1), and the driving mechanism (4) is drivingly connected between the hot pressing movable mold (3) and the main frame (1); The fixed mold (2) is provided with a positioning groove (20), and the positioning groove (20) is used to accommodate and cooperate with the packaging box. The upper side surface of the fixed mold (2) is also provided with a first sealing portion (21), and the first sealing portion (21) is arranged around the outer side of the positioning groove (20); A protrusion (30) is provided in a floating manner at the lower part of the hot pressing movable mold (3), and the protrusion (30) is matched with the positioning groove (20) in a concave-convex manner. The hot pressing movable mold (3) is also provided with a second sealing part (31), and the second sealing part (31) is arranged around the outer side of the protrusion (30), and the first sealing part (21) and the second sealing part (31) are pressed and matched; A heating element (301) is also provided inside the protrusion (30), and the heating elements (301) are dispersedly arranged around the outer surface of the protrusion (30); a blowing hole (302) is opened on the lower surface of the protrusion (30), and a blowing pipe (303) is provided inside the hot pressing movable mold (3), one end of the blowing pipe (303) is connected to the blowing hole (302), and the other end of the blowing pipe (303) is connected to an air compressor.

2. The packaging box laminating device according to claim 1, characterized in that: A guide groove (32) is provided inside the hot pressing movable mold (3), and the protrusion (30) is slidably sealed and installed in the guide groove (32). An elastic member (33) is also provided between the protrusion (30) and the bottom of the guide groove (32), and the elastic member (33) is pressed downwardly with the protrusion (30) so that the protrusion (30) elastically squeezes the positioning groove (20).

3. The packaging box laminating device according to claim 1, characterized in that: The floating range of the protruding portion (30) relative to the hot pressing movable mold (3) is 0 to 25 mm, and the minimum floating air pressure of the protruding portion (30) is 0.12 Mpa to 0.2 Mpa.

4. The packaging box laminating device according to claim 1, characterized in that: The blowing hole (302) is a trumpet-shaped opening, and the blowing hole (302) is gradually expanded from top to bottom. The maximum opening diameter of the blowing hole (302) is D, and satisfies: D≤25 mm.

5. The packaging box laminating device according to claim 1, characterized in that: The protrusion (30) is in the shape of a quadrangular prism, and a chamfered portion (304) is provided at the bottom corner of the protrusion (30). The chamfered portion (304) is arranged obliquely relative to the lower surface of the protrusion (30), and the chamfered portion (304) is spaced apart from the inner corner of the positioning groove (20).

6. The packaging box laminating device according to claim 5, characterized in that: The chamfered portion (304) is also provided with an auxiliary air hole (305), and a gas branch pipe (306) is connected between the auxiliary air hole (305) and the air blowing pipe (303).

7. The packaging box laminating device according to claim 1, characterized in that: A plurality of heat-conducting plates (307) are detachably mounted on the outside of the protrusion (30), the heating element (301) is arranged on the inner side of the heat-conducting plates (307), the plurality of heat-conducting plates (307) are spliced ​​and combined with respect to the circumferential contour of the protrusion (30), and the heat-conducting plates (307) are arranged flush with the outer surface of the protrusion (30).

8. The packaging box laminating device according to claim 7, characterized in that: The heating element (301) is an electric heating wire, and the electric heating wire is arranged in a spiral shape or an S-shaped extension. The heating element (301) is in contact with the heat conducting plate (307), and the heat conducting plate (307) is a copper heat conducting plate (307), and the minimum thickness of the heat conducting plate (307) is ≥5 mm.

9. The packaging box laminating device according to claim 1, characterized in that: The air blowing pipe (303) is provided with a pressure sensor (308) near the air blowing hole (302), and the air blowing pipe (303) is also provided with a solenoid valve near the air compressor, and the pressure sensor (308) is used to detect the air blowing pressure in real time; The packaging box laminating device also includes a controller, which is electrically connected to the pressure sensor (308) and the solenoid valve respectively. The controller is provided with a pressure threshold. The controller is used to receive a blowing pressure signal and control the solenoid valve to close when the blowing pressure exceeds the pressure threshold.

10. The packaging box laminating device according to claim 1, characterized in that: The first sealing portion (21) is an annular retaining edge, the annular retaining edge is arranged to protrude from the upper side surface of the fixed mold (2), and the second sealing portion (31) is an annular groove, at least two sealing rings (35) are embedded in the annular groove, and the at least two sealing rings (35) are arranged in a concentric ring manner, and the at least two sealing rings (35) are respectively sealed with the upper surface of the annular retaining edge.

Images