Heat-sealing transmission mechanism and air cushion machine

Abstract

Disclosed are heat-sealing transmission mechanism and air cushion machine. The heat-sealing transmission mechanism includes a wheel body and heating elements wound around the outer circumference of the wheel body. Gaps are formed between two bent corners of the heating elements. The gaps of at least two heating elements are circumferentially staggered on an axial projection plane of the wheel body. The air cushion machine includes a driving component and the heat-sealing transmission mechanism. The heating elements form at least two heat-sealing lines on the film ply. The two bent corners of the heating elements form a pair of heat-sealing trailing ends which share extrusion pressure exerted by the gas in the inflatable chamber, thereby minimizing the likelihood of poor sealing at the heat-sealing trailing ends. Sealed gas leaking through the gap between the pair of heat-sealing trailing ends near inflatable chamber is blocked by at least one heat-sealing line.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a bypass Continuation application of International Patent Application No. PCT / CN2024 / 098698, filed Jun. 12, 2024, which claims priority to Chinese Patent Application No. 202310693166.5, filed Jun. 12, 2023; the disclosures of all of which are incorporated herein by reference in their entirety.TECHNICAL FIELD

[0002] The present invention relates to a heat-sealing transmission mechanism and an air cushion machine.BACKGROUND

[0003] In the logistics field, the use of cushioning air cushions or bubble bags for packaging items has become increasingly common. Existing air cushion machines seal the inflated air cushion film or bubble bags using compression heat-sealing. That is, they basically use a heating wire to compress and heat-seal the inflation port of the air cushion film or bubble bags.

[0004] U.S. Pat. No. 10,899,523B2 uses a sealing device for heat-sealing of juxtaposed film plies. Juxtaposed film plies include a plurality of inflatable chambers, with partitions separating the individual chambers. The partitions allow the juxtaposed film plies to be wrapped about an object. Such juxtaposed film plies are generally of the pre-formed type, wherein the individual chambers are pre-fabricated at a factory or other non-packaging location. The sealing apparatus comprises a rotatable support cylinder having an outer circumferential surface, and a heating element arranged around at least a portion of the outer surface and fixed thereto, with which the heating element is capable of rotating. The heating element is coiled more than once about the outer surface in the form of an overlapping helical pattern. By rotating the sealing device into contact with the juxtaposed film plies and heating the heating element to a temperature sufficient to cause the film plies seal together, the parallel film plies can be sealed. However, this configuration of the heating element has the following issues when heat-sealing the film plies.

[0005] Since the heating element is coiled about the surface of the support cylinder more than once in the form of helical pattern, the two bent corners (end portions) 188 and 190 of the heating element on the surface of the support cylinder (FIG. 18 of U.S. Ser. No. 10 / 899,523B2) are distributed axially along the support cylinder. These two bent corners 188 and 190 of the heating element on the surface of the support cylinder do not lie on the same radial cross-section perpendicular to the axis of the support cylinder. This results in the presence of isolated heat-sealing trailing ends near the heat-sealing line in certain inflatable chambers. As shown in FIG. 1 (i.e., FIG. 20 of U.S. Ser. No. 10 / 899,523B2), a heat-sealing trailing end 178 is formed, creating a heat-sealing gap with the adjacent seals 174. During compression, the sealed gas in the inflatable chamber generates concentrated extrusion pressure at the isolated heat-sealing trailing end 178, causing a tendency for the heat-sealing trailing end 178 to deform and twist. This extrusion pressure can easily cause the heat-sealing line where the heat-sealing trailing end 178 is located to have poor sealing quality and rupture at the heat-sealing trailing end 178, resulting in gas leakage at that location from the inflatable chamber. Furthermore, it may further affect the sealing performance of the adjacent heat-sealing line 174 on the film plies, increasing the likelihood of defective sealing products.

[0006] Chinese patent No. 201510663017.X adopts a structure in the heat-sealing device where the heating wire is divided into two sections, each in a semicircular shape, uniformly wound around the wheel wall surface of the first roller in the circumferential direction. The opposing winding method of the two semicircular heating wires also serves the heat-sealing function. The heat generated by the heating wire is conducted to the air cushion roll film to achieve heat-sealing. However, this configuration of the heating wire has the following issues when heat-sealing the air cushion roll film.

[0007] Since the heating wire adopts a two-section semicircular structure, with each section in a semicircular shape wound around the wheel wall surface of the first roller in the circumferential direction, the two semicircular heating wires are distributed axially along the first roller and arranged oppositely, without being on the same radial cross-section perpendicular to the axis of the first roller. As shown in FIG. 2, the bent corners of the two semicircular heating wires form heat-sealing trailing ends 1 and 2 on the air cushion roll film, distributed axially along the first roller (in the left and right directions in FIG. 2). The two heat-sealing trailing ends 1 and 2 form a sealing gap. During compression, the sealed gas in the inflatable chamber generates concentrated extrusion pressure near the heat-sealing trailing end 2 close to the inflatable chamber, causing the positions of heat-sealing trailing ends 1 and 2 to show a tendency of twisted deformation. This extrusion pressure easily causes the heat-sealing line 3 where the heat-sealing trailing end 2 is located to have poor sealing quality and rupture at the heal-seal trailing end 2, resulting in gas leakage at that location from the inflatable chamber. Moreover, since the two semicircular heating wires are on different radial cross-sections, when poor sealing occurs at the heat-sealing trailing end 2 near the inflatable chamber (e.g., the two layers of the air cushion roll film separate at this location), the gas inside the inflatable chamber directly leaks out in the reverse direction of the inflation direction, i.e., direction F, resulting in defective air cushion roll films.

[0008] Therefore, how to overcome the above-mentioned technical defects is urgently needed to be addressed by those skilled in the art.SUMMARY

[0009] The purpose of the present invention is to provide a heat-sealing transmission mechanism and an air cushion machine.

[0010] According to one aspect of the present invention, a heat-sealing transmission mechanism is provided, comprising:

[0011] a rotatable wheel body; and

[0012] a plurality of heating elements wound around an outer circumference of the wheel body, forming gaps between two bent corners on the outer circumference of the wheel body, wherein at least two of the heating elements have gaps on the outer circumference of the wheel body and circumferentially staggered in distribution on a projection plane in an axial direction of the wheel body;

[0013] wherein overlapping film plies are sealed together by bringing the wheel body into contact with overlapping film plies and heating the heating elements to a temperature sufficient to seal the film plies together.

[0014] According to the technical solution of the present invention, the wheel body comes into contact with the overlapping film plies (i.e., cushioning air cushions or bubble bags with openings to be heat-sealed). When the heating elements are heated to a temperature sufficient to seal the film plies together, the heat generated by the heating elements is conducted to the overlapping film plies as the wheel body rotates, thereby sealing the overlapping film plies together. Since there are multiple heating elements, at least two heat-sealing lines are formed by the heating elements along an axial direction of the wheel body on the film plies, and each heating element forms a pair of heat-sealing trailing ends by its two bent corners on the film plies. The sealed gas inside the inflatable chamber exerts extrusion pressure on both heat-sealing trailing ends at a pair of heat-sealing trailing ends near the inflatable chamber. Because the two heat-sealing trailing ends are on the same heat-sealing line, the extrusion pressure of the sealed gas inside the inflatable chamber is evenly distributed across the two heat-sealing trailing ends, preventing twisting deformation. This ensures that the extrusion pressure exerted by the sealed gas inside the inflatable chamber on the two heat-sealing trailing ends is balanced, reducing the extrusion pressure at each heat-sealing trailing end. This greatly reduces the possibility of poor sealing or breakage at the heat-sealing trailing ends. Moreover, because the gaps of at least two heating elements on the outer circumference of the wheel body are circumferentially staggered in distribution on the projection plane in the axial direction of the wheel body, even if the sealed gas inside the inflatable chamber leaks through a slight gap between the pair of heat-sealing trailing ends near the inflatable chamber, the leaked gas will be blocked by at least one heat-sealing line. It will not leak directly through the gaps between the heat-sealing trailing ends of all the heat-sealing lines, thereby ensuring the sealing effect to the greatest extent.

[0015] In some embodiments, the number of heating elements may be two and they are arranged in parallel, with the gaps on the outer circumference of the wheel body located on opposite sides of the wheel body. Thus, the two heating elements form two parallel heat-sealing lines on the film plies. Since the gaps of the two heating elements on the outer circumference of the wheel body are located on opposite sides of the wheel body, the distance between the pair of heat-sealing trailing ends on one heat-sealing line and the pair of heat-sealing trailing ends on the other heat-sealing line is maximized. This greatly reduces the likelihood of the gas leaking through the gap between the pair of heat-sealing trailing ends near the inflatable chamber and then leaking again through the gap between the pair of heat-sealing trailing ends on the heat-sealing line farther from the inflatable chamber, thereby maximizing the sealing effect of the inflatable chamber.

[0016] In some embodiments, the outer circumference of the wheel body may be provided with a first notch and a second notch. The two ends of one heating element are inserted into the first notch, and the two ends of the other heating element are inserted into the second notch. The first notch is located near one end of the wheel body, while the second notch is located near the other end of the wheel body. Thus, the first and second notches near the ends facilitate the fixation of the ends of the two heating elements after they are wound around the wheel body, making it easier to disassemble and replace the heating elements.

[0017] In some embodiments, the two ends of the heating elements may be inserted into the outer circumference of the wheel body. Thus, after the two heating elements are wound around the wheel body, the two ends of the heating elements are inserted into the wheel body for fixation, preventing the heating elements from loosening during use.

[0018] In some embodiments, a plane where the heating elements are located may be perpendicular to the axial direction of the wheel body. This ensures that the heat-sealing lines formed by the heating elements on the film plies remain straight, allowing the two heat-sealing trailing ends of each pair of heat-sealing trailing ends of the heat-sealing lines to evenly distribute the extrusion pressure of the sealed gas inside the inflatable chamber without twisting deformation, thereby ensuring the sealing effect.

[0019] In some embodiments, the outer circumference of the wheel body may be provided with accommodating grooves for holding the heating elements, with the number of accommodating grooves corresponding to the number of heating elements. The heating elements are placed in the accommodating grooves, and their surfaces are not lower than the outer circumferential surface of the wheel body. This prevents the heating elements from shifting during use, ensuring the heat-sealing effect.

[0020] In some embodiments, the mechanism may further include two first springs and two second springs arranged on the wheel body.

[0021] One end of each of the two first springs is fixed on the wheel body, while the other end is connected to one end of each of the two heating elements.

[0022] One end of each of the two second springs is fixed on the wheel body, while the other end is connected to the other end of each of the two heating elements.

[0023] Thus, the first and second springs may ensure that the heating elements are tightly stretched on the outer circumference of the wheel body, preventing the heating elements from loosening or shifting during use.

[0024] In some embodiments, the mechanism may further include a first conductive sheet, a second conductive sheet, a third conductive sheet, and a fourth conductive sheet arranged on the wheel body.

[0025] One end of the first conductive sheet is disposed at one end of a first heating element, and one end of the second conductive sheet is disposed at the other end of the first heating element.

[0026] One end of the third conductive sheet is disposed at one end of a second heating element, and one end of the fourth conductive sheet is disposed at the other end of the second heating element.

[0027] Thus, the first and second conductive sheets allow the first heating element to be energized and heated to a temperature sufficient to seal the film plies together, while the third and fourth conductive sheets allow the second heating element to be energized and heated to a temperature sufficient to seal the film plies together.

[0028] In some embodiments, the mechanism may further include a first binding post and a second binding post arranged on the wheel body. The other end of the second conductive sheet is connected to the other end of the fourth conductive sheet, thereby connecting the two heating elements in series. The other end of the first conductive sheet is disposed at the first binding post, while the other end of the third conductive sheet is disposed at the second binding post. Thus, connecting the two heating elements in series only requires the first conductive sheet and the third conductive sheet to be connected to a power line, thereby optimizing the circuit layout on the wheel body. Furthermore, as long as the two heating elements in series have the same resistance value, their temperatures will remain consistent, ensuring uniform heat-sealing quality of the two heat-sealing lines formed by the two heating elements on the film plies and a consistent appearance of the heat-sealed cushioning air cushions or bubble bags.

[0029] According to another aspect of the present invention, an air cushion machine is provided, comprising a driving component and the aforementioned heat-sealing transmission mechanism, wherein the driving component drives the wheel body to rotate.

[0030] In the air cushion machine according to the present invention, the wheel body comes into contact with the overlapping film plies. When the heating elements are heated to a temperature sufficient to seal the film plies together, the driving component drives the wheel body to rotate, and the heat generated by the heating elements is conducted to the overlapping film plies, sealing them together. The heating elements form at least two heat-sealing lines along the axial direction of the wheel body on the film plies, and each heating element forms a pair of heat-sealing trailing ends on the film plies at its two bent corners. The two heat-sealing trailing ends evenly distribute the extrusion pressure of the sealed gas inside the inflatable chamber without twisting deformation. This ensures that the extrusion pressure exerted by the sealed gas inside the inflatable chamber on the two heat-sealing trailing ends is balanced, reducing the extrusion pressure at each heat-sealing trailing end. This greatly reduces the possibility of poor sealing or breakage at the heat-sealing trailing ends. Moreover, even if the sealed gas inside the inflatable chamber leaks through a slight gap between the pair of heat-sealing trailing ends near the inflatable chamber, the leaked gas will be blocked by at least one heat-sealing line and will not leak directly through the gaps between the heat-sealing trailing ends of all the heat-sealing lines, thereby ensuring the sealing effect of the heat-sealed cushioning air cushion or bubble bag to the greatest extent.BRIEF DESCRIPTION OF DRAWINGS

[0031] FIG. 1 is FIG. 20 from U.S. Pat. No. 10,899,523B2;

[0032] FIG. 2 is a diagram showing the heat-sealing effect of the first roller sealing the air cushion roll film in Chinese patent No. 201510663017.X;

[0033] FIG. 3 is a schematic structural diagram of a heat-sealing transmission mechanism according to an embodiment of the present invention;

[0034] FIG. 4 is a schematic structural diagram of the heat-sealing transmission mechanism shown in FIG. 3 along direction A;

[0035] FIG. 5 is a rear view of the heat-sealing transmission mechanism shown in FIG. 4;

[0036] FIG. 6 is a bottom view of the heat-sealing transmission mechanism shown in FIG. 5;

[0037] FIG. 7 is a rear view of the heat-sealing transmission mechanism shown in FIG. 6;

[0038] FIG. 8 is a schematic structural diagram of a wheel body in the heat-sealing transmission mechanism shown in FIG. 3;

[0039] FIG. 9 is a side view of the heat-sealing transmission mechanism shown in FIG. 3;

[0040] FIG. 10 is a diagram showing the heat-sealing effect after the heat-sealing transmission mechanism shown in FIG. 3 heat-seals a cushioning air cushion or bubble bag.DETAILED EMBODIMENTS

[0041] The technical solution of the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings of the embodiments of the present invention. It is apparent that the described embodiments are only part of, rather than all, the embodiments of the present invention.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inner”, “outer”, etc., are based on the orientation or positional relationships shown in the drawings. They are only intended to facilitate the description and simplify the explanation of the present invention, and do not indicate or imply that the referenced devices or elements must have specific orientations or be constructed and operated in specific orientations. Therefore, they should not be interpreted as limitations of the present invention. Furthermore, the terms “first”, “second”, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features referred to.

[0043] FIGS. 3 to 9 schematically show a structure of a heat-sealing transmission mechanism according to an embodiment of the present invention.

[0044] Referring to FIGS. 3 to 9, a heat-sealing transmission mechanism includes a wheel body 1 and heating elements 2. Additionally, the heat-sealing transmission mechanism may further include a first spring 3, a second spring 4, a first conductive sheet 5, a second conductive sheet 6, a third conductive sheet 7, a fourth conductive sheet 8, a first binding post 9, a second binding post 10, and a third binding post 11.

[0045] The wheel body 1 can be driven to rotate by a driving component, which may be a motor.

[0046] Referring to FIGS. 3, 6, 7, and 9, multiple heating elements 2 are wound around an outer circumference of the wheel body 1. In this embodiment, there are preferably two heating elements 2 wound parallel to each other around the outer circumference of the wheel body 1. Each heating element 2 is wound around a circle of the outer circumference of the wheel body 1. The two heating elements 2 can form two parallel heat-sealing lines on a film ply of a cushioning air cushion or bubble bag. In other embodiments, the number of heating elements 2 can be adaptively adjusted according to heat-sealing requirements.

[0047] Referring to FIGS. 6 and 7, a plane where the two heating elements 2 are located is perpendicular to an axial direction of the wheel body 1. This can ensure that the heat-sealing lines formed by the heating elements 2 on the film ply of the cushioning air cushion or bubble bag are always straight, allowing two heat-sealing trailing ends at each pair of sealing trailing ends on the heat-sealing lines to evenly share an extrusion pressure of a sealed gas inside an inflatable chamber without causing distorted deformation, thereby ensuring the sealing effect.

[0048] Referring to FIG. 6, the heating element 2 on an upper side forms a gap 201 between two bent corners 21 on the outer circumference of the wheel body 1. Referring to FIG. 7, the heating element 2 on a lower side also forms a gap 201 between two bent corners 21 on the outer circumference of the wheel body 1. It should be noted that since the two ends of the same heating element 2 should not touch each other to avoid a short circuit, there must be a gap 201 between the two bent corners 21 of each heating element 2 on the outer circumference. Furthermore, there will inevitably be multiple pairs of heat-sealing trailing ends on the heat-sealing lines formed by the two bent corners 21 of the heating element 2 on the film ply. To improve the sealing effect, the gap 201 between the two bent corners 21 of the heating element 2 on the outer circumference should be kept as small as possible to ensure that the gap between the two heat-sealing trailing ends in each pair of heat-sealing trailing ends is sufficiently small.

[0049] In this embodiment, the heating elements 2 are preferably flat, which ensures that the heat-sealing lines on the film ply of the cushioning air cushion or bubble bag after being heat-sealed have a certain width, thereby ensuring sealing performance. In other embodiments, the shape of the heating elements 2 can be designed differently according to the heat-sealing requirements, as long as the heat-sealing effect and sealing performance are ensured.

[0050] Referring to FIG. 8, the outer circumference of the wheel body 1 is formed with accommodating grooves 13 to hold the heating elements 2. The number of accommodating grooves 13 matches the number of heating elements 2. Each accommodating groove 13 holds one heating element 2 to prevent the heating element 2 from shifting during use, which could affect the heat-sealing effect. When the outer circumferential surface of the wheel body 1 is made of hard material, the surface of the heating element 2, once placed in the accommodating grooves 13, does not sit below the outer circumference of the wheel body 1, ensuring that the heating element 2 can heat-seal the film ply of the cushioning air cushion or bubble bag. When the outer circumferential surface of the wheel body 1 is made of elastic material, the surface of the heating elements 2 may be slightly lower than the outer circumference of the wheel body 1 after being placed in the accommodating grooves 13. Thus, when the wheel body 1 presses against the film ply of the cushioning air cushion or bubble bag, the periphery of the wheel body 1 is extruded, and the heating elements 2 in the accommodating grooves 13 can still heat-seal the film ply of the cushioning air cushion or bubble bag.

[0051] The surface of the heating element 2 may also be covered with a layer of heat-resistant adhesive tape.

[0052] Referring to FIGS. 3, 6, 7, and 9, the gap 201 between the two bent corners 21 of one heating element 2 and the gap 201 between the two bent corners 21 of the other heating element 2 are circumferentially staggered on an axial projection plane of the wheel body 1. In other words, the gap 201 between the two bent corners 21 of one heating element 2 and the gap 201 between the two bent corners 21 of the other heating element 2 are not aligned on the outer circumference of the wheel body 1. The two heating elements 2 form two heat-sealing lines on the film ply of the cushioning air cushion or bubble bag in the axial direction of the wheel body 1, and each heating element 2 creates a pair of heat-sealing trailing ends on the film ply at its two bent corners 21. The sealed gas in the inflatable chamber of the cushioning air cushion or bubble bag exerts extrusion pressure on both heat-sealing trailing ends at a pair of heat-sealing trailing ends near the inflatable chamber. Since the two heat-sealing trailing ends are on the same heat-sealing line, they evenly share the extrusion pressure of the sealed gas inside the inflatable chamber without distorted deformation, thereby balancing the extrusion pressure of the sealed gas inside the inflatable chamber on the two heat-sealing trailing ends. The extrusion pressure on each heat-sealing trailing end is reduced, which minimizes the likelihood of poor heat-sealing or rupture at the heat-sealing trailing ends. Additionally, since the gaps 201 of the two heating elements 2 on the outer circumference of the wheel body 1 are circumferentially staggered on the axial projection plane of the wheel body 1, even if the sealed gas inside the inflatable chamber of the cushioning air cushion or bubble bag leaks through a slight gap between the pair of heat-sealing trailing ends near the inflatable chamber, the leaked gas will be blocked by at least one heat-sealing line and will not leak directly through the gaps between the heat-sealing trailing ends of all the heat-sealing lines, thereby ensuring the sealing effect to the greatest extent.

[0053] In other embodiments, when the number of heating elements 2 is N (N≥3), the gaps 201 between the two bent corners 21 of each heating element 2 may be staggered on the outer circumference of the wheel body 1, or N−1 gaps 201 may be aligned on the outer circumference of the wheel body 1. As long as the gaps 201 between the two bent corners 21 of two heating elements 2 are staggered on the outer circumference of the wheel body 1, i.e., ensuring that the gaps 201 between the two bent corners 21 of at least two heating elements 2 are staggered on the outer circumference of the wheel body 1, the gaps 201 between the two bent corners 21 of N heating elements 2 can be ensured not aligned on the outer circumference of the wheel body 1. Thus, even if the sealed gas inside the inflatable chamber of the cushioning air cushion or bubble bag leaks through a slight gap between a pair of heat-sealing trailing ends near the inflatable chamber, the leaked gas will be blocked by at least one heat-sealing line, and will not leak directly through the gaps between the heat-sealing trailing ends of all the heat-sealing lines, thereby ensuring the sealing effect to the greatest extent.

[0054] Referring to FIGS. 3, 8, and 9, a first notch 11 and a second notch 12 are formed on the outer circumference of the wheel body 1. Referring to FIG. 6, the first notch 11 is located near an upper end of the wheel body 1. Referring to FIG. 7, the second notch 12 is located near a lower end of the wheel body 1. The first notch 11 and the second notch 12 are positioned on opposite sides of the wheel body 1. The two ends of one heating element 2 are inserted into the first notch 11. This heating element 2 is bent at the first notch 11 to form two bent corners 21, which do not touch each other. A gap 201 is formed between the two bent corners 21 to prevent short-circuiting. The two ends of another heating element 2 are inserted into the second notch 12. That heating element 2 is bent at the second notch 12 to form two bent corners 21, which also do not touch each other. A gap 201 is formed between the two bent corners 21 to prevent short-circuiting. The arrangement of the first notch 11 and the second notch 12 near the upper and lower ends of the wheel body 1, respectively, facilitates the fixing of the ends of the two heating elements 2 after they are wound around the wheel body 1 and makes it easier to disassemble and replace the heating elements 2. Since the first notch 11 and the second notch 12 are located on opposite sides of the wheel body 1, the two bent corners 21 of one heating element 2 on the outer circumference of the wheel body 1 and the two bent corners 21 of another heating element 2 on the outer circumference of the wheel body 1 are positioned on the opposite sides of the wheel body 1. That is, the gaps 201 of the two heating elements 2 on the outer circumference of the wheel body 1 are arranged circumferentially opposite each other by 180 degrees in the axial projection plane of the wheel body 1. This can ensure that a distance between a pair of heat-sealing trailing ends on one heat-sealing line and a pair of heat-sealing trailing ends on the other heat-sealing line of the two heat-sealing lines formed by the two heating elements 2 on the film ply of the cushioning air cushion or bubble bag is maximized. This greatly reduces the likelihood of the gas leaking through a slight gap between the pair of heat-sealing trailing ends near the inflatable chamber and then leaking again through a slight gap between the pair of heat-sealing trailing ends on the heat-sealing line farther from the inflatable chamber, thereby ensuring the sealing effect of the inflatable chamber to the greatest extent.

[0055] In this embodiment, the two ends of one heating element 2 are inserted into the first notch 11, while the two ends of another heating element 2 are inserted into the second notch 12. In other embodiments, the two ends of the heating elements 2 may also be directly inserted into the outer circumference of the wheel body 1. That is, two oppositely arranged through-holes are formed on the outer circumference of the wheel body 1. The two ends of one heating element 2 are inserted into one through-hole, and this heating element 2 is bent at the through-hole to form two bent corners 21 that do not touch each other, preventing short-circuiting. The two ends of another heating element 2 are inserted into the other through-hole, and that heating element 2 is also bent at the through-hole to form two bent corners 21 that also do not touch each other, preventing short-circuiting.

[0056] There are two first springs 3 and two second springs 4. Specifically, one end of one first spring 3 is fixed to the wheel body 1, and the other end is connected to one end of one heating element 2. One end of one second spring 4 is fixed to the wheel body 1, and the other end is connected to the other end of the aforementioned heating element 2. One end of the other first spring 3 is fixed to the wheel body 1, and the other end is connected to one end of another heating element 2. One end of the other second spring 4 is fixed to the wheel body 1, and the other end is connected to the other end of the aforementioned heating element 2. The installation relationship of the first springs 3, second springs 4, and the wheel body 1 can be seen in FIGS. 3 and 8. A first receiving chamber 14 and a second receiving chamber 15 are formed on an upper end face of the wheel body 1. The first receiving chamber 14 intercommunicates with the first notch 11, and the second receiving chamber 15 also intercommunicates with the first notch 11. Referring to FIG. 5, one first spring 3 is housed in the second receiving chamber 15, with one end fixed to a bottom wall of the second receiving chamber 15 by a first screw 31, and the other end connected to one end of one heating element 2. One second spring 4 is housed in the first receiving chamber 14, with one end fixed to a bottom wall of the first receiving chamber 14 by a second screw 41, and the other end connected to the other end of the aforementioned heating element 2 (the one connected to the first spring 3). The first and second springs 3 and 4 can ensure that the heating element 2 is tensioned around the outer circumference of the wheel body 1, preventing the heating element 2 from loosening or shifting during use. Referring to FIG. 9, a third receiving chamber 16 and a fourth receiving chamber 17 are formed on a lower end face of the wheel body 1, both communicating with the second notch 12. Referring to FIGS. 4 and 9, a second first spring 3 is housed in the fourth receiving chamber 17, with one end fixed to a bottom wall of the fourth receiving chamber 17 by the first screw 31, and the other end connected to one end of a second heating element 2. A second second spring 4 is housed in the third receiving chamber 16, with one end fixed to a bottom wall of the third receiving chamber 16 by the second screw 41, and the other end connected to the other end of the aforementioned heating element 2 (the one connected to the second first spring 3). The first and second springs 3 and 4 can ensure that the heating element 2 is tensioned around the wheel body 1, preventing the heating element 2 from loosening or shifting during use. Additionally, the length of the first spring 3 can be shorter than that of the second spring 4, while the tensile strength is greater than that of the second spring 4. Thus, when installing the heating element 2, the first spring 3 can be first fixed in the second receiving chamber 15 / fourth receiving chamber 17 by the first screw 31, and the second spring 4 can be fixed in the first receiving chamber 14 / third receiving chamber 16 by the second screw 41, and then one end of one heating element 2 can be installed on one first spring 3, and then this heating element 2 can be wound around the outer circumference of the wheel body 1. Then, the corresponding second spring 4 can be stretched, and the other end of this heating element 2 can be installed on the second spring 4. One end of a second heating element 2 can be installed on a second first spring 3, and then that heating element 2 can be wound around the outer circumference of the wheel body 1. Then, the corresponding second second spring 4 can be stretched, and the other end of the heating element 2 can be installed on the second second spring 4. Because the tensile strength of the second spring 4 is lower than that of the first spring 3, when installing the other end of the heating element 2, the second spring 4 is more easily stretched to connect with the heating element 2. When removing the heating element 2, the second spring 4 is first stretched, and then the heating element 2 is removed from the second spring 4. Then, the heating element 2 is removed from the first spring 3. The tensile strength of the first spring 3 is greater than that of the second spring 4, which can ensure the tightening effect on the heating element 2 and also simplify the installation and removal of the heating element 2. At the same time, the length of the first spring 3 is less than the length of the second spring 4, which can also save layout space on the wheel body 1.

[0057] Referring to FIGS. 3 to 5, one end of the first conductive sheet 5 passes through the wheel body 1 and is connected to one end of the first heating element 2. One end of the first conductive sheet 5 can be welded to one end of the first heating element 2 and then jointly fixed on the first second spring 4. One end of the second conductive sheet 6 passes through the wheel body 1 and is connected to the other end of the aforementioned first heating element 2. One end of the second conductive sheet 6 can be welded to the other end of the first heating element 2 and then jointly fixed on the first first spring 3. One end of the third conductive sheet 7 is connected to one end of the second heating element 2. One end of the third conductive sheet 7 can be welded to one end of the second heating element 2 and then jointly fixed on the second first spring 3. One end of the fourth conductive sheet 8 is connected to the other end of the aforementioned second heating element 2. One end of the fourth conductive sheet 8 can be welded to the other end of the aforementioned second heating element 2 and then jointly fixed on the second second spring 4. The first conductive sheet 5, second conductive sheet 6, third conductive sheet 7, and fourth conductive sheet 8 are all arranged in a flat layout on the end face of the wheel body 1. One end of each of the first conductive sheet 5 and the second conductive sheet 6 is bent and passes through the wheel body 1. One end of the third conductive sheet 7 is bent and inserted into the second receiving chamber 15. One end of the fourth conductive sheet 8 is bent and inserted into the first receiving chamber 14. The first heating element 2 can be powered and heated to a temperature sufficient to seal the film plies of the cushioning air cushion or bubble bag together through the first conductive sheet 5 and the second conductive sheet 6. The second heating element 2 can be powered and heated to a temperature sufficient to seal the film plies of the cushioning air cushion or bubble bag together through the third conductive sheet 7 and the fourth conductive sheet 8.

[0058] Referring to FIGS. 3 and 9, the first binding post 9, second binding post 10, and third binding post 111 are all inserted into the wheel body 1. The end of the first conductive sheet 5 is fixed on the first binding post 9. The end of the third conductive sheet 7 is fixed on the second binding post 10. The first binding post 9 and the second binding post 10 are respectively connected to the power wires. The second conductive sheet 6 and the fourth conductive sheet 8 are connected together and jointly fixed on the third binding post 111. This allows the two heating elements 2 to be connected in series. The third binding post 111 is not connected to the power wires. The third binding post 111 not only realizes the series connection of the two heating elements 2 but also enables the wheel body 1 to be mounted on the air cushion machine at three points: the first binding post 9, the second binding post 10, and the third binding post 111, ensuring that the wheel body 1 can be securely installed on the air cushion machine.

[0059] The air cushion machine includes a driving component and the aforementioned heat-sealing transmission mechanism, both of which are mounted on the air cushion machine. The driving component can drive the wheel body 1 of the heat-sealing transmission mechanism to rotate. The wheel body 1 comes into contact with the overlapping film plies of the cushioning air cushion or bubble bag conveyed by the air cushion machine. The heat-sealing transmission mechanism can heat-seal the overlapping film plies of the cushioning air cushion or bubble bag, and the rotating wheel body 1 can convey the cushioning air cushion or bubble bag downstream.

[0060] FIG. 10 schematically shows the heat-sealing effect after the heat-sealing transmission mechanism shown in FIG. 3 performs heat-sealing on the cushioning air cushion or bubble bag.

[0061] According to the technical solution of the present invention, the first binding post 9 and the second binding post 10 are respectively connected to the power wires on the air cushion machine. Referring to FIG. 10, the wheel body 1 comes into contact with the overlapping film plies on the left side of the cushioning air cushion or bubble bag 101 conveyed by the air cushion machine. The overlapping film plies on the left side of the cushioning air cushion or bubble bag 101 need to be heat-sealed at the opening. When the two heating elements 2 are heated to a temperature sufficient to seal the film plies on the left side of the cushioning air cushion or bubble bag 101 together, the driving component on the air cushion machine drives the wheel body 1 to rotate. As the wheel body 1 rotates, the heat generated by the two heating elements 2 is conducted to the overlapping film plies to seal them together. At the same time, the rotating wheel body 1 conveys the cushioning air cushion or bubble bag 101 downstream. Since the gaps 201 between the two bent corners 21 of one heating element 2 and the other heating element 2 on the outer circumference of the wheel body 1 are respectively located on opposite sides of the wheel body 1, referring to FIG. 10, the two heating elements 2 form two parallel heat-sealing lines 103 and 104 on the film ply. The two bent corners 21 of one heating element 2 form a pair of heat-sealing trailing ends 105 on the film ply, while the two bent corners 21 of the other heating element 2 form a pair of heat-sealing trailing ends 106 on the film ply. The pair of heat-sealing trailing ends 105 on the heat-sealing line 103 is staggered laterally with the pair of heat-sealing trailing ends 106 on the heat-sealing line 104. The gas sealed inside the inflatable chamber 102 exerts extrusion pressure on both heat-sealing trailing ends 105 at a pair of the heat-sealing trailing ends 105 near the inflatable chamber 102. Since the two heat-sealing trailing ends 105 are on the same heat-sealing line 103, they share the extrusion pressure of the sealed gas inside the inflatable chamber 102 without causing twisted deformation, thereby achieving a balanced effect of the extrusion pressure of the sealed gas inside the inflatable chamber 102 on the two heat-sealing trailing ends 105. The extrusion pressure on each heat-sealing trailing end 105 is reduced, minimizing the possibility of poor heat-sealing and damage at the heat-sealing trailing ends 105. Moreover, since the gaps 201 of the two heating elements 2 on the outer circumference of the wheel body 1 are circumferentially staggered on the axial projection plane of the wheel body 1, even if the sealed gas inside the inflatable chamber 102 leaks through the slight gap 107 between the pair of heat-sealing trailing ends 105 near the inflatable chamber, the leaked gas will be blocked by the adjacent heat-sealing line 104 and will not directly leak through the slight gap 107 between the pair of heat-sealing trailing ends 106 on the adjacent heat-sealing line 104. Furthermore, since the gaps 201 between the bent corners 21 of one heating element 2 and the other heating element 2 on the outer circumference of the wheel body 1 are located on opposite sides of the wheel body 1, the distance between the pair of heat-sealing trailing ends 105 on the heat-sealing line 103 and the pair of heat-sealing trailing ends 106 on the heat-sealing line 104 is maximized, greatly reducing the possibility of gas leaking from the slight gap 107 between the pair of heat-sealing trailing ends 105 near the inflatable chamber and then leaking again through the slight gap 107 between the pair of heat-sealing trailing ends 106 far from the inflatable chamber, thereby ensuring the sealing effect of the inflatable chamber 102 to the greatest extent. Additionally, since the plane where the two heating elements 2 are located is perpendicular to the axial direction of the wheel body 1, the two heating elements 2 form two parallel heat-sealing lines 103 and 104 on the film ply, ensuring that the two heat-sealing lines formed by the two heating elements 2 on the film ply are always straight and parallel. This ensures that the two heat-sealing trailing ends 105 on the heat-sealing line 103 share the extrusion pressure of the sealed gas inside the inflatable chamber 102 without causing twisted deformation, ensuring the sealing effect. The cushioning air cushion or bubble bag 101 may vary in style and size. In some inflatable chambers, the heat-sealing line near the inflatable chamber has heat-sealing trailing ends, while the heat-sealing line far from the inflatable chamber does not, forming a continuous heat-sealing line. In this case, even if the sealed gas inside the inflatable chamber leaks through the slight gap between the pair of heat-sealing trailing ends near the inflatable chamber, the heat-sealing line far from the inflatable chamber will completely block the gas leakage.

[0062] The above are merely some embodiments of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

Examples

Embodiment Construction

[0041]The technical solution of the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings of the embodiments of the present invention. It is apparent that the described embodiments are only part of, rather than all, the embodiments of the present invention.

[0042]In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inner”, “outer”, etc., are based on the orientation or positional relationships shown in the drawings. They are only intended to facilitate the description and simplify the explanation of the present invention, and do not indicate or imply that the referenced devices or elements must have specific orientations or be constructed and operated in specific orientations. Therefore, they should not be interpreted as limitations of the present invention. Furtherm...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a bypass Continuation application of International Patent Application No. PCT / CN2024 / 098698, filed Jun. 12, 2024, which claims priority to Chinese Patent Application No. 202310693166.5, filed Jun. 12, 2023; the disclosures of all of which are incorporated herein by reference in their entirety.TECHNICAL FIELD

[0002] The present invention relates to a heat-sealing transmission mechanism and an air cushion machine.BACKGROUND

[0003] In the logistics field, the use of cushioning air cushions or bubble bags for packaging items has become increasingly common. Existing air cushion machines seal the inflated air cushion film or bubble bags using compression heat-sealing. That is, they basically use a heating wire to compress and heat-seal the inflation port of the air cushion film or bubble bags.

[0004] U.S. Pat. No. 10,899,523B2 uses a sealing device for heat-sealing of juxtaposed film plies. Juxtaposed film plies include a plurality of inflatable chambers, with partitions separating the individual chambers. The partitions allow the juxtaposed film plies to be wrapped about an object. Such juxtaposed film plies are generally of the pre-formed type, wherein the individual chambers are pre-fabricated at a factory or other non-packaging location. The sealing apparatus comprises a rotatable support cylinder having an outer circumferential surface, and a heating element arranged around at least a portion of the outer surface and fixed thereto, with which the heating element is capable of rotating. The heating element is coiled more than once about the outer surface in the form of an overlapping helical pattern. By rotating the sealing device into contact with the juxtaposed film plies and heating the heating element to a temperature sufficient to cause the film plies seal together, the parallel film plies can be sealed. However, this configuration of the heating element has the following issues when heat-sealing the film plies.

[0005] Since the heating element is coiled about the surface of the support cylinder more than once in the form of helical pattern, the two bent corners (end portions) 188 and 190 of the heating element on the surface of the support cylinder (FIG. 18 of U.S. Ser. No. 10 / 899,523B2) are distributed axially along the support cylinder. These two bent corners 188 and 190 of the heating element on the surface of the support cylinder do not lie on the same radial cross-section perpendicular to the axis of the support cylinder. This results in the presence of isolated heat-sealing trailing ends near the heat-sealing line in certain inflatable chambers. As shown in FIG. 1 (i.e., FIG. 20 of U.S. Ser. No. 10 / 899,523B2), a heat-sealing trailing end 178 is formed, creating a heat-sealing gap with the adjacent seals 174. During compression, the sealed gas in the inflatable chamber generates concentrated extrusion pressure at the isolated heat-sealing trailing end 178, causing a tendency for the heat-sealing trailing end 178 to deform and twist. This extrusion pressure can easily cause the heat-sealing line where the heat-sealing trailing end 178 is located to have poor sealing quality and rupture at the heat-sealing trailing end 178, resulting in gas leakage at that location from the inflatable chamber. Furthermore, it may further affect the sealing performance of the adjacent heat-sealing line 174 on the film plies, increasing the likelihood of defective sealing products.

[0006] Chinese patent No. 201510663017.X adopts a structure in the heat-sealing device where the heating wire is divided into two sections, each in a semicircular shape, uniformly wound around the wheel wall surface of the first roller in the circumferential direction. The opposing winding method of the two semicircular heating wires also serves the heat-sealing function. The heat generated by the heating wire is conducted to the air cushion roll film to achieve heat-sealing. However, this configuration of the heating wire has the following issues when heat-sealing the air cushion roll film.

[0007] Since the heating wire adopts a two-section semicircular structure, with each section in a semicircular shape wound around the wheel wall surface of the first roller in the circumferential direction, the two semicircular heating wires are distributed axially along the first roller and arranged oppositely, without being on the same radial cross-section perpendicular to the axis of the first roller. As shown in FIG. 2, the bent corners of the two semicircular heating wires form heat-sealing trailing ends 1 and 2 on the air cushion roll film, distributed axially along the first roller (in the left and right directions in FIG. 2). The two heat-sealing trailing ends 1 and 2 form a sealing gap. During compression, the sealed gas in the inflatable chamber generates concentrated extrusion pressure near the heat-sealing trailing end 2 close to the inflatable chamber, causing the positions of heat-sealing trailing ends 1 and 2 to show a tendency of twisted deformation. This extrusion pressure easily causes the heat-sealing line 3 where the heat-sealing trailing end 2 is located to have poor sealing quality and rupture at the heal-seal trailing end 2, resulting in gas leakage at that location from the inflatable chamber. Moreover, since the two semicircular heating wires are on different radial cross-sections, when poor sealing occurs at the heat-sealing trailing end 2 near the inflatable chamber (e.g., the two layers of the air cushion roll film separate at this location), the gas inside the inflatable chamber directly leaks out in the reverse direction of the inflation direction, i.e., direction F, resulting in defective air cushion roll films.

[0008] Therefore, how to overcome the above-mentioned technical defects is urgently needed to be addressed by those skilled in the art.SUMMARY

[0009] The purpose of the present invention is to provide a heat-sealing transmission mechanism and an air cushion machine.

[0010] According to one aspect of the present invention, a heat-sealing transmission mechanism is provided, comprising:

[0011] a rotatable wheel body; and

[0012] a plurality of heating elements wound around an outer circumference of the wheel body, forming gaps between two bent corners on the outer circumference of the wheel body, wherein at least two of the heating elements have gaps on the outer circumference of the wheel body and circumferentially staggered in distribution on a projection plane in an axial direction of the wheel body;

[0013] wherein overlapping film plies are sealed together by bringing the wheel body into contact with overlapping film plies and heating the heating elements to a temperature sufficient to seal the film plies together.

[0014] According to the technical solution of the present invention, the wheel body comes into contact with the overlapping film plies (i.e., cushioning air cushions or bubble bags with openings to be heat-sealed). When the heating elements are heated to a temperature sufficient to seal the film plies together, the heat generated by the heating elements is conducted to the overlapping film plies as the wheel body rotates, thereby sealing the overlapping film plies together. Since there are multiple heating elements, at least two heat-sealing lines are formed by the heating elements along an axial direction of the wheel body on the film plies, and each heating element forms a pair of heat-sealing trailing ends by its two bent corners on the film plies. The sealed gas inside the inflatable chamber exerts extrusion pressure on both heat-sealing trailing ends at a pair of heat-sealing trailing ends near the inflatable chamber. Because the two heat-sealing trailing ends are on the same heat-sealing line, the extrusion pressure of the sealed gas inside the inflatable chamber is evenly distributed across the two heat-sealing trailing ends, preventing twisting deformation. This ensures that the extrusion pressure exerted by the sealed gas inside the inflatable chamber on the two heat-sealing trailing ends is balanced, reducing the extrusion pressure at each heat-sealing trailing end. This greatly reduces the possibility of poor sealing or breakage at the heat-sealing trailing ends. Moreover, because the gaps of at least two heating elements on the outer circumference of the wheel body are circumferentially staggered in distribution on the projection plane in the axial direction of the wheel body, even if the sealed gas inside the inflatable chamber leaks through a slight gap between the pair of heat-sealing trailing ends near the inflatable chamber, the leaked gas will be blocked by at least one heat-sealing line. It will not leak directly through the gaps between the heat-sealing trailing ends of all the heat-sealing lines, thereby ensuring the sealing effect to the greatest extent.

[0015] In some embodiments, the number of heating elements may be two and they are arranged in parallel, with the gaps on the outer circumference of the wheel body located on opposite sides of the wheel body. Thus, the two heating elements form two parallel heat-sealing lines on the film plies. Since the gaps of the two heating elements on the outer circumference of the wheel body are located on opposite sides of the wheel body, the distance between the pair of heat-sealing trailing ends on one heat-sealing line and the pair of heat-sealing trailing ends on the other heat-sealing line is maximized. This greatly reduces the likelihood of the gas leaking through the gap between the pair of heat-sealing trailing ends near the inflatable chamber and then leaking again through the gap between the pair of heat-sealing trailing ends on the heat-sealing line farther from the inflatable chamber, thereby maximizing the sealing effect of the inflatable chamber.

[0016] In some embodiments, the outer circumference of the wheel body may be provided with a first notch and a second notch. The two ends of one heating element are inserted into the first notch, and the two ends of the other heating element are inserted into the second notch. The first notch is located near one end of the wheel body, while the second notch is located near the other end of the wheel body. Thus, the first and second notches near the ends facilitate the fixation of the ends of the two heating elements after they are wound around the wheel body, making it easier to disassemble and replace the heating elements.

[0017] In some embodiments, the two ends of the heating elements may be inserted into the outer circumference of the wheel body. Thus, after the two heating elements are wound around the wheel body, the two ends of the heating elements are inserted into the wheel body for fixation, preventing the heating elements from loosening during use.

[0018] In some embodiments, a plane where the heating elements are located may be perpendicular to the axial direction of the wheel body. This ensures that the heat-sealing lines formed by the heating elements on the film plies remain straight, allowing the two heat-sealing trailing ends of each pair of heat-sealing trailing ends of the heat-sealing lines to evenly distribute the extrusion pressure of the sealed gas inside the inflatable chamber without twisting deformation, thereby ensuring the sealing effect.

[0019] In some embodiments, the outer circumference of the wheel body may be provided with accommodating grooves for holding the heating elements, with the number of accommodating grooves corresponding to the number of heating elements. The heating elements are placed in the accommodating grooves, and their surfaces are not lower than the outer circumferential surface of the wheel body. This prevents the heating elements from shifting during use, ensuring the heat-sealing effect.

[0020] In some embodiments, the mechanism may further include two first springs and two second springs arranged on the wheel body.

[0021] One end of each of the two first springs is fixed on the wheel body, while the other end is connected to one end of each of the two heating elements.

[0022] One end of each of the two second springs is fixed on the wheel body, while the other end is connected to the other end of each of the two heating elements.

[0023] Thus, the first and second springs may ensure that the heating elements are tightly stretched on the outer circumference of the wheel body, preventing the heating elements from loosening or shifting during use.

[0024] In some embodiments, the mechanism may further include a first conductive sheet, a second conductive sheet, a third conductive sheet, and a fourth conductive sheet arranged on the wheel body.

[0025] One end of the first conductive sheet is disposed at one end of a first heating element, and one end of the second conductive sheet is disposed at the other end of the first heating element.

[0026] One end of the third conductive sheet is disposed at one end of a second heating element, and one end of the fourth conductive sheet is disposed at the other end of the second heating element.

[0027] Thus, the first and second conductive sheets allow the first heating element to be energized and heated to a temperature sufficient to seal the film plies together, while the third and fourth conductive sheets allow the second heating element to be energized and heated to a temperature sufficient to seal the film plies together.

[0028] In some embodiments, the mechanism may further include a first binding post and a second binding post arranged on the wheel body. The other end of the second conductive sheet is connected to the other end of the fourth conductive sheet, thereby connecting the two heating elements in series. The other end of the first conductive sheet is disposed at the first binding post, while the other end of the third conductive sheet is disposed at the second binding post. Thus, connecting the two heating elements in series only requires the first conductive sheet and the third conductive sheet to be connected to a power line, thereby optimizing the circuit layout on the wheel body. Furthermore, as long as the two heating elements in series have the same resistance value, their temperatures will remain consistent, ensuring uniform heat-sealing quality of the two heat-sealing lines formed by the two heating elements on the film plies and a consistent appearance of the heat-sealed cushioning air cushions or bubble bags.

[0029] According to another aspect of the present invention, an air cushion machine is provided, comprising a driving component and the aforementioned heat-sealing transmission mechanism, wherein the driving component drives the wheel body to rotate.

[0030] In the air cushion machine according to the present invention, the wheel body comes into contact with the overlapping film plies. When the heating elements are heated to a temperature sufficient to seal the film plies together, the driving component drives the wheel body to rotate, and the heat generated by the heating elements is conducted to the overlapping film plies, sealing them together. The heating elements form at least two heat-sealing lines along the axial direction of the wheel body on the film plies, and each heating element forms a pair of heat-sealing trailing ends on the film plies at its two bent corners. The two heat-sealing trailing ends evenly distribute the extrusion pressure of the sealed gas inside the inflatable chamber without twisting deformation. This ensures that the extrusion pressure exerted by the sealed gas inside the inflatable chamber on the two heat-sealing trailing ends is balanced, reducing the extrusion pressure at each heat-sealing trailing end. This greatly reduces the possibility of poor sealing or breakage at the heat-sealing trailing ends. Moreover, even if the sealed gas inside the inflatable chamber leaks through a slight gap between the pair of heat-sealing trailing ends near the inflatable chamber, the leaked gas will be blocked by at least one heat-sealing line and will not leak directly through the gaps between the heat-sealing trailing ends of all the heat-sealing lines, thereby ensuring the sealing effect of the heat-sealed cushioning air cushion or bubble bag to the greatest extent.BRIEF DESCRIPTION OF DRAWINGS

[0031] FIG. 1 is FIG. 20 from U.S. Pat. No. 10,899,523B2;

[0032] FIG. 2 is a diagram showing the heat-sealing effect of the first roller sealing the air cushion roll film in Chinese patent No. 201510663017.X;

[0033] FIG. 3 is a schematic structural diagram of a heat-sealing transmission mechanism according to an embodiment of the present invention;

[0034] FIG. 4 is a schematic structural diagram of the heat-sealing transmission mechanism shown in FIG. 3 along direction A;

[0035] FIG. 5 is a rear view of the heat-sealing transmission mechanism shown in FIG. 4;

[0036] FIG. 6 is a bottom view of the heat-sealing transmission mechanism shown in FIG. 5;

[0037] FIG. 7 is a rear view of the heat-sealing transmission mechanism shown in FIG. 6;

[0038] FIG. 8 is a schematic structural diagram of a wheel body in the heat-sealing transmission mechanism shown in FIG. 3;

[0039] FIG. 9 is a side view of the heat-sealing transmission mechanism shown in FIG. 3;

[0040] FIG. 10 is a diagram showing the heat-sealing effect after the heat-sealing transmission mechanism shown in FIG. 3 heat-seals a cushioning air cushion or bubble bag.DETAILED EMBODIMENTS

[0041] The technical solution of the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings of the embodiments of the present invention. It is apparent that the described embodiments are only part of, rather than all, the embodiments of the present invention.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inner”, “outer”, etc., are based on the orientation or positional relationships shown in the drawings. They are only intended to facilitate the description and simplify the explanation of the present invention, and do not indicate or imply that the referenced devices or elements must have specific orientations or be constructed and operated in specific orientations. Therefore, they should not be interpreted as limitations of the present invention. Furthermore, the terms “first”, “second”, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features referred to.

[0043] FIGS. 3 to 9 schematically show a structure of a heat-sealing transmission mechanism according to an embodiment of the present invention.

[0044] Referring to FIGS. 3 to 9, a heat-sealing transmission mechanism includes a wheel body 1 and heating elements 2. Additionally, the heat-sealing transmission mechanism may further include a first spring 3, a second spring 4, a first conductive sheet 5, a second conductive sheet 6, a third conductive sheet 7, a fourth conductive sheet 8, a first binding post 9, a second binding post 10, and a third binding post 11.

[0045] The wheel body 1 can be driven to rotate by a driving component, which may be a motor.

[0046] Referring to FIGS. 3, 6, 7, and 9, multiple heating elements 2 are wound around an outer circumference of the wheel body 1. In this embodiment, there are preferably two heating elements 2 wound parallel to each other around the outer circumference of the wheel body 1. Each heating element 2 is wound around a circle of the outer circumference of the wheel body 1. The two heating elements 2 can form two parallel heat-sealing lines on a film ply of a cushioning air cushion or bubble bag. In other embodiments, the number of heating elements 2 can be adaptively adjusted according to heat-sealing requirements.

[0047] Referring to FIGS. 6 and 7, a plane where the two heating elements 2 are located is perpendicular to an axial direction of the wheel body 1. This can ensure that the heat-sealing lines formed by the heating elements 2 on the film ply of the cushioning air cushion or bubble bag are always straight, allowing two heat-sealing trailing ends at each pair of sealing trailing ends on the heat-sealing lines to evenly share an extrusion pressure of a sealed gas inside an inflatable chamber without causing distorted deformation, thereby ensuring the sealing effect.

[0048] Referring to FIG. 6, the heating element 2 on an upper side forms a gap 201 between two bent corners 21 on the outer circumference of the wheel body 1. Referring to FIG. 7, the heating element 2 on a lower side also forms a gap 201 between two bent corners 21 on the outer circumference of the wheel body 1. It should be noted that since the two ends of the same heating element 2 should not touch each other to avoid a short circuit, there must be a gap 201 between the two bent corners 21 of each heating element 2 on the outer circumference. Furthermore, there will inevitably be multiple pairs of heat-sealing trailing ends on the heat-sealing lines formed by the two bent corners 21 of the heating element 2 on the film ply. To improve the sealing effect, the gap 201 between the two bent corners 21 of the heating element 2 on the outer circumference should be kept as small as possible to ensure that the gap between the two heat-sealing trailing ends in each pair of heat-sealing trailing ends is sufficiently small.

[0049] In this embodiment, the heating elements 2 are preferably flat, which ensures that the heat-sealing lines on the film ply of the cushioning air cushion or bubble bag after being heat-sealed have a certain width, thereby ensuring sealing performance. In other embodiments, the shape of the heating elements 2 can be designed differently according to the heat-sealing requirements, as long as the heat-sealing effect and sealing performance are ensured.

[0050] Referring to FIG. 8, the outer circumference of the wheel body 1 is formed with accommodating grooves 13 to hold the heating elements 2. The number of accommodating grooves 13 matches the number of heating elements 2. Each accommodating groove 13 holds one heating element 2 to prevent the heating element 2 from shifting during use, which could affect the heat-sealing effect. When the outer circumferential surface of the wheel body 1 is made of hard material, the surface of the heating element 2, once placed in the accommodating grooves 13, does not sit below the outer circumference of the wheel body 1, ensuring that the heating element 2 can heat-seal the film ply of the cushioning air cushion or bubble bag. When the outer circumferential surface of the wheel body 1 is made of elastic material, the surface of the heating elements 2 may be slightly lower than the outer circumference of the wheel body 1 after being placed in the accommodating grooves 13. Thus, when the wheel body 1 presses against the film ply of the cushioning air cushion or bubble bag, the periphery of the wheel body 1 is extruded, and the heating elements 2 in the accommodating grooves 13 can still heat-seal the film ply of the cushioning air cushion or bubble bag.

[0051] The surface of the heating element 2 may also be covered with a layer of heat-resistant adhesive tape.

[0052] Referring to FIGS. 3, 6, 7, and 9, the gap 201 between the two bent corners 21 of one heating element 2 and the gap 201 between the two bent corners 21 of the other heating element 2 are circumferentially staggered on an axial projection plane of the wheel body 1. In other words, the gap 201 between the two bent corners 21 of one heating element 2 and the gap 201 between the two bent corners 21 of the other heating element 2 are not aligned on the outer circumference of the wheel body 1. The two heating elements 2 form two heat-sealing lines on the film ply of the cushioning air cushion or bubble bag in the axial direction of the wheel body 1, and each heating element 2 creates a pair of heat-sealing trailing ends on the film ply at its two bent corners 21. The sealed gas in the inflatable chamber of the cushioning air cushion or bubble bag exerts extrusion pressure on both heat-sealing trailing ends at a pair of heat-sealing trailing ends near the inflatable chamber. Since the two heat-sealing trailing ends are on the same heat-sealing line, they evenly share the extrusion pressure of the sealed gas inside the inflatable chamber without distorted deformation, thereby balancing the extrusion pressure of the sealed gas inside the inflatable chamber on the two heat-sealing trailing ends. The extrusion pressure on each heat-sealing trailing end is reduced, which minimizes the likelihood of poor heat-sealing or rupture at the heat-sealing trailing ends. Additionally, since the gaps 201 of the two heating elements 2 on the outer circumference of the wheel body 1 are circumferentially staggered on the axial projection plane of the wheel body 1, even if the sealed gas inside the inflatable chamber of the cushioning air cushion or bubble bag leaks through a slight gap between the pair of heat-sealing trailing ends near the inflatable chamber, the leaked gas will be blocked by at least one heat-sealing line and will not leak directly through the gaps between the heat-sealing trailing ends of all the heat-sealing lines, thereby ensuring the sealing effect to the greatest extent.

[0053] In other embodiments, when the number of heating elements 2 is N (N≥3), the gaps 201 between the two bent corners 21 of each heating element 2 may be staggered on the outer circumference of the wheel body 1, or N−1 gaps 201 may be aligned on the outer circumference of the wheel body 1. As long as the gaps 201 between the two bent corners 21 of two heating elements 2 are staggered on the outer circumference of the wheel body 1, i.e., ensuring that the gaps 201 between the two bent corners 21 of at least two heating elements 2 are staggered on the outer circumference of the wheel body 1, the gaps 201 between the two bent corners 21 of N heating elements 2 can be ensured not aligned on the outer circumference of the wheel body 1. Thus, even if the sealed gas inside the inflatable chamber of the cushioning air cushion or bubble bag leaks through a slight gap between a pair of heat-sealing trailing ends near the inflatable chamber, the leaked gas will be blocked by at least one heat-sealing line, and will not leak directly through the gaps between the heat-sealing trailing ends of all the heat-sealing lines, thereby ensuring the sealing effect to the greatest extent.

[0054] Referring to FIGS. 3, 8, and 9, a first notch 11 and a second notch 12 are formed on the outer circumference of the wheel body 1. Referring to FIG. 6, the first notch 11 is located near an upper end of the wheel body 1. Referring to FIG. 7, the second notch 12 is located near a lower end of the wheel body 1. The first notch 11 and the second notch 12 are positioned on opposite sides of the wheel body 1. The two ends of one heating element 2 are inserted into the first notch 11. This heating element 2 is bent at the first notch 11 to form two bent corners 21, which do not touch each other. A gap 201 is formed between the two bent corners 21 to prevent short-circuiting. The two ends of another heating element 2 are inserted into the second notch 12. That heating element 2 is bent at the second notch 12 to form two bent corners 21, which also do not touch each other. A gap 201 is formed between the two bent corners 21 to prevent short-circuiting. The arrangement of the first notch 11 and the second notch 12 near the upper and lower ends of the wheel body 1, respectively, facilitates the fixing of the ends of the two heating elements 2 after they are wound around the wheel body 1 and makes it easier to disassemble and replace the heating elements 2. Since the first notch 11 and the second notch 12 are located on opposite sides of the wheel body 1, the two bent corners 21 of one heating element 2 on the outer circumference of the wheel body 1 and the two bent corners 21 of another heating element 2 on the outer circumference of the wheel body 1 are positioned on the opposite sides of the wheel body 1. That is, the gaps 201 of the two heating elements 2 on the outer circumference of the wheel body 1 are arranged circumferentially opposite each other by 180 degrees in the axial projection plane of the wheel body 1. This can ensure that a distance between a pair of heat-sealing trailing ends on one heat-sealing line and a pair of heat-sealing trailing ends on the other heat-sealing line of the two heat-sealing lines formed by the two heating elements 2 on the film ply of the cushioning air cushion or bubble bag is maximized. This greatly reduces the likelihood of the gas leaking through a slight gap between the pair of heat-sealing trailing ends near the inflatable chamber and then leaking again through a slight gap between the pair of heat-sealing trailing ends on the heat-sealing line farther from the inflatable chamber, thereby ensuring the sealing effect of the inflatable chamber to the greatest extent.

[0055] In this embodiment, the two ends of one heating element 2 are inserted into the first notch 11, while the two ends of another heating element 2 are inserted into the second notch 12. In other embodiments, the two ends of the heating elements 2 may also be directly inserted into the outer circumference of the wheel body 1. That is, two oppositely arranged through-holes are formed on the outer circumference of the wheel body 1. The two ends of one heating element 2 are inserted into one through-hole, and this heating element 2 is bent at the through-hole to form two bent corners 21 that do not touch each other, preventing short-circuiting. The two ends of another heating element 2 are inserted into the other through-hole, and that heating element 2 is also bent at the through-hole to form two bent corners 21 that also do not touch each other, preventing short-circuiting.

[0056] There are two first springs 3 and two second springs 4. Specifically, one end of one first spring 3 is fixed to the wheel body 1, and the other end is connected to one end of one heating element 2. One end of one second spring 4 is fixed to the wheel body 1, and the other end is connected to the other end of the aforementioned heating element 2. One end of the other first spring 3 is fixed to the wheel body 1, and the other end is connected to one end of another heating element 2. One end of the other second spring 4 is fixed to the wheel body 1, and the other end is connected to the other end of the aforementioned heating element 2. The installation relationship of the first springs 3, second springs 4, and the wheel body 1 can be seen in FIGS. 3 and 8. A first receiving chamber 14 and a second receiving chamber 15 are formed on an upper end face of the wheel body 1. The first receiving chamber 14 intercommunicates with the first notch 11, and the second receiving chamber 15 also intercommunicates with the first notch 11. Referring to FIG. 5, one first spring 3 is housed in the second receiving chamber 15, with one end fixed to a bottom wall of the second receiving chamber 15 by a first screw 31, and the other end connected to one end of one heating element 2. One second spring 4 is housed in the first receiving chamber 14, with one end fixed to a bottom wall of the first receiving chamber 14 by a second screw 41, and the other end connected to the other end of the aforementioned heating element 2 (the one connected to the first spring 3). The first and second springs 3 and 4 can ensure that the heating element 2 is tensioned around the outer circumference of the wheel body 1, preventing the heating element 2 from loosening or shifting during use. Referring to FIG. 9, a third receiving chamber 16 and a fourth receiving chamber 17 are formed on a lower end face of the wheel body 1, both communicating with the second notch 12. Referring to FIGS. 4 and 9, a second first spring 3 is housed in the fourth receiving chamber 17, with one end fixed to a bottom wall of the fourth receiving chamber 17 by the first screw 31, and the other end connected to one end of a second heating element 2. A second second spring 4 is housed in the third receiving chamber 16, with one end fixed to a bottom wall of the third receiving chamber 16 by the second screw 41, and the other end connected to the other end of the aforementioned heating element 2 (the one connected to the second first spring 3). The first and second springs 3 and 4 can ensure that the heating element 2 is tensioned around the wheel body 1, preventing the heating element 2 from loosening or shifting during use. Additionally, the length of the first spring 3 can be shorter than that of the second spring 4, while the tensile strength is greater than that of the second spring 4. Thus, when installing the heating element 2, the first spring 3 can be first fixed in the second receiving chamber 15 / fourth receiving chamber 17 by the first screw 31, and the second spring 4 can be fixed in the first receiving chamber 14 / third receiving chamber 16 by the second screw 41, and then one end of one heating element 2 can be installed on one first spring 3, and then this heating element 2 can be wound around the outer circumference of the wheel body 1. Then, the corresponding second spring 4 can be stretched, and the other end of this heating element 2 can be installed on the second spring 4. One end of a second heating element 2 can be installed on a second first spring 3, and then that heating element 2 can be wound around the outer circumference of the wheel body 1. Then, the corresponding second second spring 4 can be stretched, and the other end of the heating element 2 can be installed on the second second spring 4. Because the tensile strength of the second spring 4 is lower than that of the first spring 3, when installing the other end of the heating element 2, the second spring 4 is more easily stretched to connect with the heating element 2. When removing the heating element 2, the second spring 4 is first stretched, and then the heating element 2 is removed from the second spring 4. Then, the heating element 2 is removed from the first spring 3. The tensile strength of the first spring 3 is greater than that of the second spring 4, which can ensure the tightening effect on the heating element 2 and also simplify the installation and removal of the heating element 2. At the same time, the length of the first spring 3 is less than the length of the second spring 4, which can also save layout space on the wheel body 1.

[0057] Referring to FIGS. 3 to 5, one end of the first conductive sheet 5 passes through the wheel body 1 and is connected to one end of the first heating element 2. One end of the first conductive sheet 5 can be welded to one end of the first heating element 2 and then jointly fixed on the first second spring 4. One end of the second conductive sheet 6 passes through the wheel body 1 and is connected to the other end of the aforementioned first heating element 2. One end of the second conductive sheet 6 can be welded to the other end of the first heating element 2 and then jointly fixed on the first first spring 3. One end of the third conductive sheet 7 is connected to one end of the second heating element 2. One end of the third conductive sheet 7 can be welded to one end of the second heating element 2 and then jointly fixed on the second first spring 3. One end of the fourth conductive sheet 8 is connected to the other end of the aforementioned second heating element 2. One end of the fourth conductive sheet 8 can be welded to the other end of the aforementioned second heating element 2 and then jointly fixed on the second second spring 4. The first conductive sheet 5, second conductive sheet 6, third conductive sheet 7, and fourth conductive sheet 8 are all arranged in a flat layout on the end face of the wheel body 1. One end of each of the first conductive sheet 5 and the second conductive sheet 6 is bent and passes through the wheel body 1. One end of the third conductive sheet 7 is bent and inserted into the second receiving chamber 15. One end of the fourth conductive sheet 8 is bent and inserted into the first receiving chamber 14. The first heating element 2 can be powered and heated to a temperature sufficient to seal the film plies of the cushioning air cushion or bubble bag together through the first conductive sheet 5 and the second conductive sheet 6. The second heating element 2 can be powered and heated to a temperature sufficient to seal the film plies of the cushioning air cushion or bubble bag together through the third conductive sheet 7 and the fourth conductive sheet 8.

[0058] Referring to FIGS. 3 and 9, the first binding post 9, second binding post 10, and third binding post 111 are all inserted into the wheel body 1. The end of the first conductive sheet 5 is fixed on the first binding post 9. The end of the third conductive sheet 7 is fixed on the second binding post 10. The first binding post 9 and the second binding post 10 are respectively connected to the power wires. The second conductive sheet 6 and the fourth conductive sheet 8 are connected together and jointly fixed on the third binding post 111. This allows the two heating elements 2 to be connected in series. The third binding post 111 is not connected to the power wires. The third binding post 111 not only realizes the series connection of the two heating elements 2 but also enables the wheel body 1 to be mounted on the air cushion machine at three points: the first binding post 9, the second binding post 10, and the third binding post 111, ensuring that the wheel body 1 can be securely installed on the air cushion machine.

[0059] The air cushion machine includes a driving component and the aforementioned heat-sealing transmission mechanism, both of which are mounted on the air cushion machine. The driving component can drive the wheel body 1 of the heat-sealing transmission mechanism to rotate. The wheel body 1 comes into contact with the overlapping film plies of the cushioning air cushion or bubble bag conveyed by the air cushion machine. The heat-sealing transmission mechanism can heat-seal the overlapping film plies of the cushioning air cushion or bubble bag, and the rotating wheel body 1 can convey the cushioning air cushion or bubble bag downstream.

[0060] FIG. 10 schematically shows the heat-sealing effect after the heat-sealing transmission mechanism shown in FIG. 3 performs heat-sealing on the cushioning air cushion or bubble bag.

[0061] According to the technical solution of the present invention, the first binding post 9 and the second binding post 10 are respectively connected to the power wires on the air cushion machine. Referring to FIG. 10, the wheel body 1 comes into contact with the overlapping film plies on the left side of the cushioning air cushion or bubble bag 101 conveyed by the air cushion machine. The overlapping film plies on the left side of the cushioning air cushion or bubble bag 101 need to be heat-sealed at the opening. When the two heating elements 2 are heated to a temperature sufficient to seal the film plies on the left side of the cushioning air cushion or bubble bag 101 together, the driving component on the air cushion machine drives the wheel body 1 to rotate. As the wheel body 1 rotates, the heat generated by the two heating elements 2 is conducted to the overlapping film plies to seal them together. At the same time, the rotating wheel body 1 conveys the cushioning air cushion or bubble bag 101 downstream. Since the gaps 201 between the two bent corners 21 of one heating element 2 and the other heating element 2 on the outer circumference of the wheel body 1 are respectively located on opposite sides of the wheel body 1, referring to FIG. 10, the two heating elements 2 form two parallel heat-sealing lines 103 and 104 on the film ply. The two bent corners 21 of one heating element 2 form a pair of heat-sealing trailing ends 105 on the film ply, while the two bent corners 21 of the other heating element 2 form a pair of heat-sealing trailing ends 106 on the film ply. The pair of heat-sealing trailing ends 105 on the heat-sealing line 103 is staggered laterally with the pair of heat-sealing trailing ends 106 on the heat-sealing line 104. The gas sealed inside the inflatable chamber 102 exerts extrusion pressure on both heat-sealing trailing ends 105 at a pair of the heat-sealing trailing ends 105 near the inflatable chamber 102. Since the two heat-sealing trailing ends 105 are on the same heat-sealing line 103, they share the extrusion pressure of the sealed gas inside the inflatable chamber 102 without causing twisted deformation, thereby achieving a balanced effect of the extrusion pressure of the sealed gas inside the inflatable chamber 102 on the two heat-sealing trailing ends 105. The extrusion pressure on each heat-sealing trailing end 105 is reduced, minimizing the possibility of poor heat-sealing and damage at the heat-sealing trailing ends 105. Moreover, since the gaps 201 of the two heating elements 2 on the outer circumference of the wheel body 1 are circumferentially staggered on the axial projection plane of the wheel body 1, even if the sealed gas inside the inflatable chamber 102 leaks through the slight gap 107 between the pair of heat-sealing trailing ends 105 near the inflatable chamber, the leaked gas will be blocked by the adjacent heat-sealing line 104 and will not directly leak through the slight gap 107 between the pair of heat-sealing trailing ends 106 on the adjacent heat-sealing line 104. Furthermore, since the gaps 201 between the bent corners 21 of one heating element 2 and the other heating element 2 on the outer circumference of the wheel body 1 are located on opposite sides of the wheel body 1, the distance between the pair of heat-sealing trailing ends 105 on the heat-sealing line 103 and the pair of heat-sealing trailing ends 106 on the heat-sealing line 104 is maximized, greatly reducing the possibility of gas leaking from the slight gap 107 between the pair of heat-sealing trailing ends 105 near the inflatable chamber and then leaking again through the slight gap 107 between the pair of heat-sealing trailing ends 106 far from the inflatable chamber, thereby ensuring the sealing effect of the inflatable chamber 102 to the greatest extent. Additionally, since the plane where the two heating elements 2 are located is perpendicular to the axial direction of the wheel body 1, the two heating elements 2 form two parallel heat-sealing lines 103 and 104 on the film ply, ensuring that the two heat-sealing lines formed by the two heating elements 2 on the film ply are always straight and parallel. This ensures that the two heat-sealing trailing ends 105 on the heat-sealing line 103 share the extrusion pressure of the sealed gas inside the inflatable chamber 102 without causing twisted deformation, ensuring the sealing effect. The cushioning air cushion or bubble bag 101 may vary in style and size. In some inflatable chambers, the heat-sealing line near the inflatable chamber has heat-sealing trailing ends, while the heat-sealing line far from the inflatable chamber does not, forming a continuous heat-sealing line. In this case, even if the sealed gas inside the inflatable chamber leaks through the slight gap between the pair of heat-sealing trailing ends near the inflatable chamber, the heat-sealing line far from the inflatable chamber will completely block the gas leakage.

[0062] The above are merely some embodiments of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

Examples

Embodiment Construction

[0041]The technical solution of the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings of the embodiments of the present invention. It is apparent that the described embodiments are only part of, rather than all, the embodiments of the present invention.

[0042]In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inner”, “outer”, etc., are based on the orientation or positional relationships shown in the drawings. They are only intended to facilitate the description and simplify the explanation of the present invention, and do not indicate or imply that the referenced devices or elements must have specific orientations or be constructed and operated in specific orientations. Therefore, they should not be interpreted as limitations of the present invention. Furtherm...

Claims

1. A heat-sealing transmission mechanism, comprising:a rotatable wheel body; anda plurality of heating elements wound around an outer circumference of the wheel body, wherein gaps are formed between two bent corners of the heating elements on the outer circumference of the wheel body, and at least two heating elements have gaps on the outer circumference of the wheel body and circumferentially staggered on an axial projection plane of the wheel body,wherein overlapping film plies are sealed together by bringing the wheel body into contact with the overlapping film plies and heating the heating elements to a temperature sufficient to seal the film plies together.

2. The heat-sealing transmission mechanism according to claim 1, wherein two heating elements are arranged in parallel, with the gaps on the outer circumference of the wheel body located on opposite sides of the wheel body.

3. The heat-sealing transmission mechanism according to claim 2, wherein the outer circumference of the wheel body is provided with a first notch and a second notch, with two ends of one heating element inserted into the first notch and two ends of the other heating element inserted into the second notch, the first notch being near one end of the wheel body, and the second notch being near the other end of the wheel body.

4. The heat-sealing transmission mechanism according to claim 2, wherein both ends of the heating elements are inserted into the outer circumference of the wheel body.

5. The heat-sealing transmission mechanism according to claim 1, wherein a plane where the heating elements are located is perpendicular to an axial direction of the wheel body.

6. The heat-sealing transmission mechanism according to claim 1, wherein the outer circumference of the wheel body is provided with accommodating grooves for housing the heating elements, the number of accommodating grooves being the same as the number of heating elements, and the heating elements are housed in the accommodating grooves with surfaces thereof not lower than an outer circumference surface of the wheel body.

7. The heat-sealing transmission mechanism according to claim 2, further comprising two first springs and two second springs provided on the wheel body,wherein one end of each of the two first springs is fixed to the wheel body, and the other end is connected to one end of each of the two heating elements,wherein one end of each of the two second springs is fixed to the wheel body, and the other end is connected to the other end of each of the two heating elements.

8. The heat-sealing transmission mechanism according to claim 3, further comprising two first springs and two second springs provided on the wheel body,wherein one end of each of the two first springs is fixed to the wheel body, and the other end is connected to one end of each of the two heating elements,wherein one end of each of the two second springs is fixed to the wheel body, and the other end is connected to the other end of each of the two heating elements.

9. The heat-sealing transmission mechanism according to claim 4, further comprising two first springs and two second springs provided on the wheel body,wherein one end of each of the two first springs is fixed to the wheel body, and the other end is connected to one end of each of the two heating elements,wherein one end of each of the two second springs is fixed to the wheel body, and the other end is connected to the other end of each of the two heating elements.

10. The heat-sealing transmission mechanism according to claim 2, further comprising a first conductive sheet, a second conductive sheet, a third conductive sheet, and a fourth conductive sheet provided on the wheel body,wherein one end of the first conductive sheet is disposed at one end of a first heating element, and one end of the second conductive sheet is disposed at the other end of the first heating element,one end of the third conductive sheet is disposed at one end of a second heating element, and one end of the fourth conductive sheet is disposed at the other end of the second heating element.

11. The heat-sealing transmission mechanism according to claim 3, further comprising a first conductive sheet, a second conductive sheet, a third conductive sheet, and a fourth conductive sheet provided on the wheel body,wherein one end of the first conductive sheet is disposed at one end of a first heating element, and one end of the second conductive sheet is disposed at the other end of the first heating element,one end of the third conductive sheet is disposed at one end of a second heating element, and one end of the fourth conductive sheet is disposed at the other end of the second heating element.

12. The heat-sealing transmission mechanism according to claim 4, further comprising a first conductive sheet, a second conductive sheet, a third conductive sheet, and a fourth conductive sheet provided on the wheel body,wherein one end of the first conductive sheet is disposed at one end of a first heating element, and one end of the second conductive sheet is disposed at the other end of the first heating element,one end of the third conductive sheet is disposed at one end of a second heating element, and one end of the fourth conductive sheet is disposed at the other end of the second heating element.

13. The heat-sealing transmission mechanism according to claim 10, further comprising a first binding post and a second binding post provided on the wheel body, wherein the other end of the second conductive sheet is connected to the other end of the fourth conductive sheet to connect the two heating elements in series, the other end of the first conductive sheet is disposed on the first binding post, and the other end of the third conductive sheet is disposed on the second binding post.

14. The heat-sealing transmission mechanism according to claim 11, further comprising a first binding post and a second binding post provided on the wheel body, wherein the other end of the second conductive sheet is connected to the other end of the fourth conductive sheet to connect the two heating elements in series, the other end of the first conductive sheet is disposed on the first binding post, and the other end of the third conductive sheet is disposed on the second binding post.

15. The heat-sealing transmission mechanism according to claim 12, further comprising a first binding post and a second binding post provided on the wheel body, wherein the other end of the second conductive sheet is connected to the other end of the fourth conductive sheet to connect the two heating elements in series, the other end of the first conductive sheet is disposed on the first binding post, and the other end of the third conductive sheet is disposed on the second binding post.

16. The heat-sealing transmission mechanism according to claim 5, wherein, at least two heat-sealing lines are formed by the heating elements along an axial direction of the wheel body on the film plies, and at least one pair of heat-sealing trailing ends are also formed on each heat-sealing line, so that an extrusion pressure exerted by sealed gas inside an inflatable chamber on the two heat-sealing trailing ends is balanced, and gas leaked from the inflatable chamber will be blocked by at least one heat-sealing line.

17. An air cushion machine, comprising a driving component and the heat-sealing transmission mechanism according to claim 1, wherein the driving component drives the wheel body to rotate.

18. An air cushion machine, comprising a driving component and the heat-sealing transmission mechanism according to claim 16, wherein the driving component drives the wheel body to rotate.

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