Differential type double heat sealing device and sealing machine

Abstract

The invention discloses a differential type double heat sealing device and a sealing machine. The differential type double heat sealing device comprises an outer heating assembly, an inner heating assembly, a heating device, a plurality of outer heating assembly pushing springs and a plurality of inner heating assembly pushing springs. And an outer sealing film heating part and an inner sealing film heating part are respectively formed at the edges of the same axial sides of the outer heating assembly and the inner heating assembly. The outer heating assembly pushing spring and the inner heating assembly pushing spring are connected with the outer heating assembly and the inner heating assembly respectively, and at least one of the elastic coefficient and the deformation length of the outer heating assembly pushing spring and the inner heating assembly pushing spring is different. The outer sealing film heating part and the inner sealing film heating part form sealing film combination parts with different combination strengths at different positions of the opening part of the container, so that the sealing film at the inner sealing film combination part is effectively prevented from being torn, and the sealed container can be repeatedly used.

Description

Technical Field

[0001] The present application relates to the field of container sealing, and in particular to a differential double heat-sealing device and a sealing machine having the differential double heat-sealing device. Background Art

[0002] Generally, for plastic containers, a sealing machine can be used to heat-seal a sealing film to the mouth of the container by heating, so as to form a seal by hot-melting combination, so as to contain the content inside the container and prevent leakage. Here, the content can be solid, liquid or gas.

[0003] U.S. Patent No. US11667140B2 discloses a container, in which the sealing film can be heat-sealed to two different positions of the mouth of the container respectively to form two inner and outer sealing film joints. When opening the container, the user needs to tear the lid mainly formed by the sealing film at the inner sealing film joint to separate it from the container body to open the container. When the container needs to be closed again, the user can also seal the lid to the container again, so the container can be used multiple times.

[0004] However, when heat-sealing the above container with a sealing film, the existing sealing machine can only apply the same heat-sealing temperature, heat-sealing time or heat-sealing pressure to the two sealing film joints of the container, so that the bonding strength between the sealing film and the container at these two different sealing film joints is the same. The consequence of this is that when the user tears the lid mainly formed by the sealing film, it is easy to cause an undesired tear of the sealing film at the inner sealing film joint, resulting in the container not being reusable. Summary of the Invention

[0005] In view of this, the purpose of the present application is to provide a differential double heat-sealing device, which can form different sealing film bonding strengths at different sealing film joints of the container, which is beneficial to preventing the sealing film from being torn during use. In addition, the present application also provides a sealing machine having the differential double heat-sealing device.

[0006] The present application provides a differential double heat-sealing device for heat-sealing the mouth of a container. The differential double heat-sealing device includes: an outer heating assembly, an inner heating assembly, a heating device, a plurality of outer heating assembly pushing springs, and a plurality of inner heating assembly pushing springs. The outer heating assembly and the inner heating assembly are coaxially arranged with the outer heating assembly sleeved outside the inner heating assembly. At the edges of the same axial side of the outer heating assembly and the inner heating assembly, an outer sealing film heating part and an inner sealing film heating part are respectively formed, which can generate heat to heat the sealing film. The plurality of outer heating assembly pushing springs and the plurality of inner heating assembly pushing springs are respectively connected to the outer heating assembly and the inner heating assembly, and at least one of the elastic coefficient and the deformation length of the plurality of outer heating assembly pushing springs is different from at least one of the elastic coefficient and the deformation length of the plurality of inner heating assembly pushing springs. When actuating the plurality of outer heating assembly pushing springs and the plurality of inner heating assembly pushing springs, the outer sealing film heating part and the inner sealing film heating part form a sealing film bonding part at different positions at the mouth of the container, which has different bonding strengths between the sealing film and the container.

[0007] According to an embodiment of the present application, both the outer heating assembly and the inner heating assembly are of a hollow shape that is closed on one axial side and open on the other side. A plurality of inner heating assembly spring support parts with the same diameter are equidistantly arranged along the circumferential direction on the closed side of the inner heating assembly. The plurality of inner heating assembly spring support parts extend axially for a certain length, and one end of each inner heating assembly pushing spring abuts against the corresponding inner heating assembly spring support part. At the corresponding circumferential positions on the closed side of the outer heating assembly, outer heating assembly closed-side through holes with the same number as the inner heating assembly spring support parts are provided, and their diameters are larger than those of the inner heating assembly spring support parts. Each inner heating assembly spring support part extends into the corresponding outer heating assembly closed-side through hole. A plurality of blind holes are provided on the side of the closed side of the outer heating assembly facing away from the open side of the outer heating assembly, and the number of the blind holes is the same as that of the outer heating assembly closed-side through holes. The plurality of blind holes are equidistantly distributed along the circumferential direction and are alternately arranged with the outer heating assembly closed-side through holes. One end of each outer heating assembly pushing spring abuts against the corresponding blind hole respectively.

[0008] According to an embodiment of the present application, the differential double heat-sealing device further includes a heat insulation member made of a heat insulation material, which is arranged in the internal space on the open side of the inner heating assembly, and the shape of the heat insulation member corresponds to the axial cross-sectional shape of the inner heating assembly.

[0009] According to an embodiment of the present application, the number of the blind holes, the outer heating assembly closed-side through holes, and the inner heating assembly spring support parts is at least three.

[0010] According to an embodiment of the present application, the heating device is embedded on the side of the closed side of the outer heating component facing away from the open side of the outer heating component, and is connected to an external power source for heating the outer sealing film heating part and the inner sealing film heating part. The outer heating component and the inner heating component are made of heat-conducting materials and are in contact with each other.

[0011] According to an embodiment of the present application, the differential dual heat-sealing device further includes a heat-insulating cover plate made of a heat-insulating material and completely covering the heating device.

[0012] According to an embodiment of the present application, the cross-sectional shapes of the outer sealing film heating part and the inner sealing film heating part are any one of a circle, a square, a rectangle, an ellipse, and a triangle.

[0013] According to an embodiment of the present application, the elastic coefficients of the outer heating component pushing spring and the inner heating component pushing spring are the same, and the deformation length of the outer heating component pushing spring when the outer sealing film heating part contacts the container opening is greater than the deformation length of the inner heating component pushing spring when the inner sealing film heating part contacts the sealing film, so that the heat-sealing pressure applied by the outer sealing film heating part to the sealing film is greater than the heat-sealing pressure applied by the inner sealing film heating part to the sealing film.

[0014] According to an embodiment of the present application, the elastic coefficient of the outer heating component pushing spring is greater than the elastic coefficient of the inner heating component pushing spring, and the deformation length of the outer heating component pushing spring when the outer sealing film heating part contacts the container opening is equal to the deformation length of the inner heating component pushing spring when the inner sealing film heating part contacts the sealing film, so that the heat-sealing pressure applied by the outer sealing film heating part to the sealing film is greater than the heat-sealing pressure applied by the inner sealing film heating part to the sealing film.

[0015] According to an embodiment of the present application, the elastic coefficient of the outer heating component pushing spring is greater than the elastic coefficient of the inner heating component pushing spring, and the deformation length of the outer heating component pushing spring when the outer sealing film heating part contacts the container opening is greater than the deformation length of the inner heating component pushing spring when the inner sealing film heating part contacts the sealing film, so that the heat-sealing pressure applied by the outer sealing film heating part to the sealing film is greater than the heat-sealing pressure applied by the inner sealing film heating part to the sealing film.

[0016] According to an embodiment of the present application, the elastic coefficient of the outer heating component pushing spring is less than that of the inner heating component pushing spring. The deformation length of the outer heating component pushing spring when the outer sealing film heating part contacts the container opening is greater than the deformation length of the inner heating component pushing spring when the inner sealing film heating part contacts the sealing film. And the product of the elastic coefficient and the deformation length of the outer sealing film heating part is greater than the product of the elastic coefficient and the deformation length of the inner sealing film heating part. Thus, the heat sealing pressure exerted by the outer sealing film heating part on the sealing film is greater than the heat sealing pressure exerted by the inner sealing film heating part on the sealing film.

[0017] The present application also provides a sealing machine for sealing the container opening with a sealing film in a heat sealing manner. The sealing machine includes: the differential dual heat sealing device described above, a lower container support part, and a pressing device. The lower container support part is used to support and fix the container to be sealed, and position the container opening of the container towards the outer sealing film heating part and the inner sealing film heating part. The pressing device is used to actuate the plurality of outer heating component pushing springs and the plurality of inner heating component pushing springs, so as to push the outer sealing film heating part and the inner sealing film heating part towards the lower container support part, so that the outer sealing film heating part and the inner sealing film heating part are in contact with the sealing film and the container opening.

[0018] According to an embodiment of the present application, the pressing device includes: an actuating part for receiving external power; a spring pressing part fixedly connected to the actuating part to transmit external power to the outer heating component pushing spring and the inner heating component pushing spring; and a plurality of spring guides. One end of the plurality of spring guides is fixedly connected to the corresponding blind hole and the inner heating component spring support part. The other end of the spring guide passes through the spring pressing part and is equipped with a detachable limiting part, so that the spring guide can move relative to the spring pressing part. The number of the spring guides is equal to the sum of the number of the blind holes and the inner heating component spring support parts. The outer heating component pushing spring and the inner heating component pushing spring are sleeved on the spring guides, so that both ends of the outer heating component pushing spring and the inner heating component pushing spring respectively abut between the outer heating component and the inner heating component and the spring pressing part. The limiting part can axially move relative to the spring guide to adjust the initial lengths of the outer heating component pushing spring and the inner heating component pushing spring.

[0019] The differential double heat-sealing device according to the present application and the sealing machine provided with the differential double heat-sealing device can achieve the following technical effects: Since the outer sealing film heating part and the inner sealing film heating part can apply different heat-sealing pressures respectively, two sealing film bonding parts can be formed at two different positions of the container mouth, and the two sealing film bonding parts have different sealing film bonding strengths, so that the situation of the sealing film tearing at the inner sealing film bonding part can be effectively reduced, and the sealed container can be used multiple times. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic perspective view of the differential double heat-sealing device without a spring according to an embodiment of the present application from one angle;

[0022] Figure 2 Schematic perspective view of the differential double heat-sealing device without a spring according to an embodiment of the present application from another angle;

[0023] Figure 3 Schematic exploded view of the differential double heat-sealing device according to an embodiment of the present application from one angle;

[0024] Figure 4 Schematic exploded view of the differential double heat-sealing device according to an embodiment of the present application from another angle;

[0025] Figure 5 Cross-sectional view of the outer heating assembly according to an embodiment of the present application;

[0026] Figure 6 Cross-sectional view of the inner heating assembly according to an embodiment of the present application;

[0027] Figure 7 Cross-sectional view of the assembled outer heating assembly and inner heating assembly according to an embodiment of the present application;

[0028] Figure 8 Working principle diagram of the sealing machine according to an embodiment of the present application;

[0029] Figure 9 For Figure 8 working schematic diagram of the sealing machine in

[0030] Figure 9a ForFigure 9 Partial enlarged schematic view of part A in

[0031] Figure 10 Working principle diagram of a sealing machine according to another embodiment of the present application;

[0032] Figure 11 Is Figure 10 Working schematic view of the sealing machine in

[0033] Figure 11a Is Figure 11 Partial enlarged schematic view of part B in

[0034] Figure 12 Working principle diagram of a sealing machine according to another embodiment of the present application;

[0035] Figure 13 Figure 12 Working schematic view of the sealing machine in

[0036] Figure 13a Is Figure 13 Partial enlarged schematic view of part C in

[0037] Figure 14 Working principle diagram of a sealing machine according to another embodiment of the present application;

[0038] Figure 15 Figure 14 Working schematic view of the sealing machine in

[0039] Figure 15a Is Figure 15 Partial enlarged schematic view of part D in

[0040] In the figure:

[0041] 1 Sealing machine;

[0042] 10 Differential double heat sealing device;

[0043] 11 Outer heating component, 111 Wall part of the outer heating component, 112 Closed side of the outer heating component, 113 Through hole on the closed side of the outer heating component, 114 Blind hole, 115 Heating device, 116 Outer sealing film heating part, 118 Heat insulation cover plate;

[0044] 12 Inner heating component, 121 Wall part of the inner heating component, 122 Closed side of the inner heating component, 124 Spring support part of the inner heating component, 126 Inner sealing film heating part;

[0045] 13 Heat insulation part, 15 Outer heating component push spring, 16 Inner heating component push spring;

[0046] 30 Sealing film;

[0047] 40 Pushing device, 41 Actuating part, 42 Spring pushing part, 43 Spring guide, 431 Limiting part;

[0048] 60 Lower container support part;

[0049] 2 Container, 21 Container opening. Specific embodiments

[0050] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0051] Unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. When the terms "same" and "equal" represent dimensions, areas, weights, and other physical quantities, they should be understood in a broad sense, which can be completely the same or basically the same, for example, with a difference within five percent. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0052] In an embodiment of the present application, a differential double heat-sealing device 10 is provided, which is used to thermally fuse and seal a sealing film 30 to the container opening 21 of the container 2 at at least two sealing film joint parts of the container opening, and can achieve different heat-sealing pressures, heat-sealing temperatures, or heat-sealing times at different sealing film joint parts, so as to form different sealing film joint strengths at different sealing film joint parts. Here, the container 2 can be made of plastic material and can be combined with the plastic-sealed sealing film by thermal fusion to achieve the sealing of the container opening.

[0053] In the drawings, Figure 1 FIG. is a schematic perspective view of an angle of a differential double heat-sealing device without a spring according to an embodiment of the present application. Figure 2 FIG. is a schematic perspective view of another angle of a differential double heat-sealing device without a spring according to an embodiment of the present application. Figure 3 FIG. is a schematic exploded view of an angle of a differential double heat-sealing device according to an embodiment of the present application. Figure 4 FIG. is a schematic exploded view of another angle of a differential double heat-sealing device according to an embodiment of the present application. Figure 5 FIG. is a cross-sectional view of an external heating component according to an embodiment of the present application. Figure 6Cross-sectional view of the internal heating component according to an embodiment of the present application; Figure 7 Cross-sectional view of the assembled external heating component and internal heating component according to an embodiment of the present application;

[0054] Figure 8 Schematic diagram of the working principle of a sealing machine according to an embodiment of the present application. Figure 9 For Figure 8 Working schematic diagram of the sealing machine in Figure 9a For Figure 9 Partial enlarged schematic diagram of part A in Figure 10 Schematic diagram of the working principle of a sealing machine according to another embodiment of the present application. Figure 11 For Figure 10 Working schematic diagram of the sealing machine in Figure 11a For Figure 11 Partial enlarged schematic diagram of part B in Figure 12 Schematic diagram of the working principle of a sealing machine according to another embodiment of the present application. Figure 13 Figure 12 Working schematic diagram of the sealing machine in Figure 13a For Figure 13 Partial enlarged schematic diagram of part C in Figure 14 Schematic diagram of the working principle of a sealing machine according to another embodiment of the present application. Figure 15 Figure 14 Working schematic diagram of the sealing machine in Figure 15a For Figure 15 Partial enlarged schematic diagram of part D in

[0055] As Figures 1 to 4 , Figure 9 , Figure 11 , Figure 13 And Figure 15As shown, the differential double heat-sealing device 10 according to the present application includes: an outer heating assembly 11, an inner heating assembly 12, a heat insulation member 13, and a plurality of outer heating assembly pushing springs 15 and a plurality of inner heating assembly pushing springs 16. Both the outer heating assembly 11 and the inner heating assembly 12 are hollow shapes that are closed on one axial side and open on the other side. The outer heating assembly 11 includes an outer heating assembly wall portion 111 and an outer heating assembly closed side 112. Similarly, the inner heating assembly 12 includes an inner heating assembly wall portion 121 and an inner heating assembly closed side 122. The diameter of the outer heating assembly wall portion 111 is greater than the diameter of the inner heating assembly wall portion 121. In addition, the outer heating assembly 11 is installed coaxially with the inner heating assembly 12 and sleeved outside the inner heating assembly 12, and their closed sides and open sides correspond to each other, and there is a certain radial gap between the outer heating assembly wall portion 111 and the inner heating assembly wall portion 121. The respective wall portions of the outer heating assembly 11 and the inner heating assembly 12 respectively form an outer seal film heating portion 116 and an inner seal film heating portion 126 at the axial edge of the open side, which can generate heat to heat the seal film 30 when contacting it. The axial cross-sectional shapes of the outer seal film heating portion 116 and the inner seal film heating portion 126 can be circular, square, rectangular, oval, triangular, or other suitable shapes, and they can be the same or different from each other, as long as the cross-sectional shapes of the outer seal film heating portion 116 and the inner seal film heating portion 126 correspond to the shape of the mouth of the container to be heat-sealed, and the present application does not make any restrictions.

[0056] In the present application, the outer heating assembly 11 and the inner heating assembly 12 are made of a metal material, preferably an aluminum alloy material with good thermal conductivity. Of course, they can also be made of other heat-conducting materials, and the present application does not make any restrictions.

[0057] In the present application, as Figure 3 , Figure 4 , Figure 7 , Figure 9 , Figure 11 , Figure 13 and Figure 15 shown, the differential double heat-sealing device 10 according to the present application further includes: a heating device 115 and a heat insulation cover plate 118. The heating device 115 is embedded in the surface of the outer heating assembly closed side 112 facing away from the open side of the outer heating assembly, and is electrically connected to an external power supply for heating the outer heating assembly 11. The heating device 115 is set to always maintain an energized heating state in the working state, and its temperature can be maintained at 160 degrees to 180 degrees, for example, 175 degrees or 176 degrees. The heating device 115 can be, for example, a ceramic heating sheet, or it can also be other heating devices, and the present application does not make any restrictions. In addition, since the inner heating assembly closed side 122 is in direct contact with the outer heating assembly 112, the heating device 115 can also heat the inner heating assembly 12 at the same time.

[0058] In addition, the heat insulation cover plate 118 is made of heat insulation material and completely covers the heating device 115, preventing heat loss of the heating device 115 and preventing scalding accidents. The heat insulation cover plate 118 can be made of mica material, preferably phlogopite material. Of course, the heat insulation cover plate 118 can also be made of other heat insulation materials, which is not limited in this application.

[0059] Specifically, as Figure 3 , Figure 4 , Figure 7 , Figure 9 , Figure 11 , Figure 13 and Figure 15 shown, the heat insulation member 13 is disposed in the internal space of the open side of the inner heating assembly 12, and its shape corresponds to the axial cross-sectional shape of the inner heating assembly 12, so that only the inner sealing film heating portion 126 of the inner heating assembly 12 can be in direct contact with the sealing film 30, and other parts of the inner heating assembly 12 are prevented from being in direct contact with the sealing film 30, thereby damaging the sealing film 30 during heating. With the above structure, during operation, only the outer sealing film heating portion 116 and the inner sealing film heating portion 126 are in contact with the container mouth portion 21 and the sealing film 30 placed on the container mouth portion 21 and heat them. In this application, the heat insulation member 13 can be made of heat insulation fiber material or other heat insulation materials, which is not limited in this application.

[0060] As Figures 2 to 7 , and Figure 9 , Figure 11 , Figure 13 and Figure 15 shown, a plurality of inner heating assembly spring support portions 124 (for example, three) with the same diameter are correspondingly arranged at equal intervals in the circumferential direction along the closed side 122 of the inner heating assembly. The inner heating assembly spring support portions 124 extend axially for a certain length. One end of each inner heating assembly push spring 16 abuts against the corresponding inner heating assembly spring support portion 124 respectively. Correspondingly, through holes 113 with the same number (three) are arranged at the corresponding circumferential positions of the closed side 112 of the outer heating assembly, and the diameter of the through holes 113 is larger than that of the inner heating assembly spring support portions 124. After the outer heating assembly 11 and the inner heating assembly 12 are installed, the inner heating assembly spring support portions 124 extend into the corresponding through holes 113 on the closed side of the outer heating assembly, and the inner heating assembly push springs 16 abutting against the inner heating assembly spring support portions 124 pass through the through holes 113 on the closed side of the outer heating assembly.

[0061] Furthermore, as Figures 2 to 7 , and Figure 9 , Figure 11 , Figure 13 and Figure 15As shown, a plurality of blind holes 114 are provided on the side of the outer heating assembly's closed side 112, facing away from the outer heating assembly's open side. The number of blind holes 114 can be the same as the number of through holes 113 (e.g., three), and they are evenly spaced along the circumference and alternate with the through holes 113. One end of each outer heating assembly push spring 15 abuts against a corresponding blind hole 114.

[0062] The number of the blind holes 114, the closed side through holes 113 of the outer heating component, and the spring support parts 124 of the inner heating component is not limited to three, for example, it can be four, five, or six, as long as the corresponding relationship is satisfied.

[0063] According to an embodiment of the present application, the other ends of the outer heating assembly push spring 15 and the inner heating assembly push spring 16 are fixedly connected to an external actuating device. During operation, the external actuating device can be operated to apply force to the outer heating assembly push spring 15 and the inner heating assembly push spring 16, thereby driving the outer heating assembly 11 and the inner heating assembly 12 to move axially, so that the outer sealing film heating portion 116 and the inner sealing film heating portion 126 contact the container mouth 21 and heat the sealing film 30 placed on the container mouth 21.

[0064] In the present application, the bonding strength between the sealing film and the container is mainly related to three parameters, namely, heat sealing temperature, heat sealing pressure, and heat sealing time. According to Hooke's law, F = -K·X, where K is the elastic coefficient of the spring, X is the deformation length of the spring when it is stressed, and F is the elastic force generated when the spring is deformed. By setting the elastic coefficient K and deformation length X of the outer heating component push spring 15 and the inner heating component push spring 16 (wherein, the elastic coefficient is determined by the characteristics of the spring itself, the deformation length X of the spring = initial spring length - the length of the spring after being deformed by pressure in contact with the container mouth, and the initial spring length can be set according to actual needs), the outer sealing film heating part 116 and the inner sealing film heating part 126 can respectively apply different heat sealing pressures to the sealing film 30, thereby obtaining different sealing film bonding strengths at the outer sealing film joint and the inner sealing film joint. Here, the heat sealing pressure refers to the contact pressure between the outer sealing film heating part 116 and the inner sealing film heating part 126 and the container mouth 21 and the sealing film 30 placed on the container mouth 21 during operation, which is equal to the elastic force generated by the elastic deformation of the outer heating component push spring 15 and the inner heating component push spring 16 when they contact the container mouth.

[0065] According to one embodiment of the present application, Figure 8 、 Figure 9 and Figure 9aAs shown, the external heating component pushing spring 15 and the internal heating component pushing spring 16 can be set to have the same K value, and the deformation length X1 of the external heating component pushing spring 15 when the external sealing film heating part 116 contacts the container mouth 21 is greater than the deformation length X2 of the internal heating component pushing spring 16 when the internal sealing film heating part 126 contacts the container mouth 21. In this way, when sealing, the heat sealing pressure F1 exerted by the external sealing film heating part 116 on the sealing film 30 is greater than the heat sealing pressure F2 exerted by the internal sealing film heating part 126. Therefore, the sealing film bonding strength at the external sealing film joint is greater than the sealing film bonding strength at the internal sealing film joint.

[0066] According to another embodiment of the present application, as Figure 10 , Figure 11 and Figure 11a shown, the K1 of the external heating component pushing spring 15 is set to be greater than the K2 of the internal heating component pushing spring 16, and the deformation length of the external heating component pushing spring 15 when the external sealing film heating part 116 contacts the container mouth 21 is equal to the deformation length of the internal heating component pushing spring 16 when the internal sealing film heating part 126 contacts the container mouth 21. In this way, when sealing, the heat sealing pressure F1 exerted by the external sealing film heating part 116 on the sealing film 30 is greater than the heat sealing pressure F2 exerted by the internal sealing film heating part 126. Therefore, the sealing film bonding strength at the external sealing film joint is greater than the sealing film bonding strength at the internal sealing film joint.

[0067] According to yet another embodiment of the present application, as Figure 12 , Figure 13 and Figure 13a shown, the K1 of the external heating component pushing spring 15 is set to be greater than the K2 of the internal heating component pushing spring 16, and the deformation length X1 of the external heating component pushing spring 15 when the external sealing film heating part 116 contacts the container mouth 21 is also greater than the deformation length X2 of the internal heating component pushing spring 16 when the internal sealing film heating part 126 contacts the container mouth 21. In this way, when sealing, the heat sealing pressure F1 exerted by the external sealing film heating part 116 on the sealing film 30 is greater than the heat sealing pressure F2 exerted by the internal sealing film heating part 126. Therefore, the sealing film bonding strength at the external sealing film joint is greater than the sealing film bonding strength at the internal sealing film joint.

[0068] According to yet another embodiment of the present application, as Figure 14 , Figure 15 and Figure 15aAs shown, the K1 of the outer heating component pushing spring 15 is set to be less than the K2 of the inner heating component pushing spring 16, and the deformation length X1 of the outer heating component pushing spring 15 when the outer sealing film heating part 116 contacts the container mouth 21 is set to be greater than the deformation length X2 of the inner heating component pushing spring 16 when the inner sealing film heating part 126 contacts the container mouth 21, and the heat sealing pressure F1 (F1 = -K1·X1) exerted by the outer sealing film heating part 116 on the sealing film 30 is made greater than the heat sealing pressure F2 (F2 = -K2·X2) exerted by the inner sealing film heating part 126. Therefore, the sealing film bonding strength at the outer sealing film joint is greater than the sealing film bonding strength at the inner sealing film joint.

[0069] The present application also provides a sealing machine 1, which is used to seal the container mouth with a sealing film in a heat sealing manner. As Figure 9 , Figure 11 , Figure 13 and Figure 15 shown, the sealing machine 1 according to the present application includes: a differential dual heat sealing device 10 according to the present application, a lower container support part 60, and a pressing device 40.

[0070] Among them, the pressing device 40 includes: an actuating part 41, a spring pressing part 42, and a plurality of spring guides 43. The actuating part 41 is fixedly connected to the spring pressing part 42 and receives external power. The spring guides 43 can be rod-shaped, and the number thereof is equal to the sum of the number of blind holes 114 and the inner heating component spring support parts 124. The outer heating component pushing spring 15 and the inner heating component pushing spring 16 are both sleeved on the spring guides 43, so that the spring guides can support and guide the compression and movement of the pushing springs. In addition, one end of the spring guides 43 is fixedly connected to the corresponding blind holes 114 and the inner heating component spring support parts 124 respectively, for example, by threading or welding. The other end of the spring guides 43 passes through the spring pressing part 42 and is provided with a detachable limiting part 431.

[0071] During installation, first, the outer heating component pushing spring 15 and the inner heating component pushing spring 16 are sleeved on the spring guide 43. Then, the other end of the spring guide 43 passes through the spring pressing part 42, and the limiting part 431 is installed for limiting. In this way, one ends of the outer heating component pushing spring 15 and the inner heating component pushing spring 16 are respectively abutted against the blind hole 114 and the inner heating component spring support part 114, and the other ends are both abutted against the spring pressing part 42, so as to install the outer heating component 11 and the inner heating component 12 to the pressing device 40, and the spring guide 43 can move relative to the spring pressing part 42. In addition, the limiting part 431 and the spring guide 43 can be implemented in the form of a nut and a bolt, for example, so that the limiting part 431 can axially move relative to the spring guide 43 to adjust the initial lengths of the outer heating component pushing spring 15 and the inner heating component pushing spring 16, thereby adjusting their respective deformation lengths.

[0072] In addition, the lower container support part 60 is used to support and fix the container 2 to be sealed, and position the container mouth part 21 of the container 2 towards the outer sealing film heating part 116 and the inner sealing film heating part 126.

[0073] Next, it will be combined with Figures 8 to 15a to describe the working mode of the sealing machine 1 according to the present application, where the up-down direction shown in the figure is consistent with the axial direction of the differential double heat-sealing device 10. First, the container 2 to be sealed is fixed on the lower container support part 60, the container mouth part 21 is arranged upward, and the sealing film 30 is pre-placed on the container mouth part 21. When the actuating part 41 is pressed in the downward direction, the spring pressing part 42 moves downward accordingly, and drives the outer heating component pushing spring 15 and the inner heating component pushing spring 16. In this way, the outer sealing film heating part 116 and the inner sealing film heating part 126 move downward towards the container mouth part 21 until the outer sealing film heating part 116 and the inner sealing film heating part 126 contact and abut against the container mouth part 21 and the sealing film 30 located on the container mouth part 21. At the same time, the heating device 115 is always in a constant temperature heating state, and the container mouth part 21 is heated at two different positions by the sealing film heating part 116 and the inner sealing film heating part 126 respectively for sealing, thereby forming two sealing film bonding parts. As described above, since the outer heating component pushing spring 15 and the inner heating component pushing spring 16 apply different heat-sealing pressures at this time, the sealing film bonding strength formed by the outer sealing film heating part 116 is greater than the sealing film bonding strength formed by the inner sealing film heating part 126.

[0074] The differential double heat-sealing device 10 according to the present application and the sealing machine 1 provided with the differential double heat-sealing device 10 can achieve the following technical effects: Since the outer sealing film heating part 116 and the inner sealing film heating part 126 can apply different heat-sealing pressures, two sealing film bonding parts can be formed at two different positions of the container mouth part 21, and these two sealing film bonding parts have different sealing film bonding strengths, so that the situation of the sealing film tearing at the inner sealing film bonding part can be effectively reduced, and the sealed container can be used multiple times.

[0075] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A differential double heat-sealing device for heat-sealing the mouth of a container, comprising: External heating component, internal heating component, heating device, a plurality of external heating component pushing springs and a plurality of internal heating component pushing springs, characterized in that the external heating component and the internal heating component are coaxially arranged and the external heating component is sleeved outside the internal heating component, and at the edges of the same axial side of the external heating component and the internal heating component, an external sealing film heating part and an internal sealing film heating part are respectively formed, which can generate heat to heat the sealing film; the plurality of external heating component pushing springs and the plurality of internal heating component pushing springs are respectively connected to the external heating component and the internal heating component, and at least one of the elastic coefficient and deformation length of the plurality of external heating component pushing springs is different from the elastic coefficient and deformation length of the plurality of internal heating component pushing springs. When actuating the plurality of external heating component pushing springs and the plurality of internal heating component pushing springs, the external sealing film heating part and the internal sealing film heating part form a sealing film bonding part at different positions at the mouth of the container, which has different bonding strengths between the sealing film and the container.

2. The differential dual heat sealing device according to claim 1, characterized in that both the external heating component and the internal heating component are in a hollow shape with one axial side closed and the other side open; a plurality of internal heating component spring support parts with the same diameter are arranged at equal intervals in the circumferential direction on the closed side of the internal heating component, the plurality of internal heating component spring support parts extend axially for a certain length, and one end of each internal heating component pushing spring abuts against the corresponding internal heating component spring support part; at the corresponding circumferential positions on the closed side of the external heating component, external heating component closed side through holes with the same number as the internal heating component spring support parts are provided, and their diameters are larger than the internal heating component spring support parts, and each internal heating component spring support part extends into the corresponding external heating component closed side through hole; a plurality of blind holes are provided on the side of the closed side of the external heating component facing away from the open side of the external heating component, and the number of the blind holes is the same as that of the external heating component closed side through holes. The plurality of blind holes are equally spaced in the circumferential direction and are alternately arranged with the external heating component closed side through holes. One end of each external heating component pushing spring abuts against the corresponding blind hole respectively.

3. The differential double heat-sealing device according to claim 2, wherein Further comprising: a heat insulation member made of heat insulation material, which is arranged in the internal space on the open side of the internal heating component, and the shape of the heat insulation member corresponds to the axial cross-sectional shape of the internal heating component.

4. The differential dual heat-sealing device according to claim 2, wherein, The number of the blind holes, the external heating component closed side through holes, and the internal heating component spring support parts is at least three.

5. The differential dual heat-sealing device according to claim 2, characterized in that, The heating device is buried on the side of the closed side of the external heating component facing away from the open side of the external heating component and is connected to an external power supply for heating the external sealing film heating part and the internal sealing film heating part; the external heating component and the internal heating component are made of heat-conducting materials and are in contact with each other.

6. The differential double heat-sealing device according to claim 5, wherein Further comprising: a heat insulation cover plate, which is made of heat insulation material and completely covers the heating device.

7. The differential double heat-sealing device according to claim 1, wherein The cross-sectional shapes of the external sealing film heating part and the internal sealing film heating part are any one of circular, square, rectangular, oval, and triangular.

8. The differential double heat-sealing device according to any one of claims 1 to 7, characterized in that the elastic coefficients of the outer heating component pushing spring and the inner heating component pushing spring are the same, and the deformation length of the outer heating component pushing spring when the outer sealing film heating part contacts the container mouth is greater than the deformation length of the inner heating component pushing spring when the inner sealing film heating part contacts the sealing film, so that the heat-sealing pressure applied by the outer sealing film heating part to the sealing film is greater than the heat-sealing pressure applied by the inner sealing film heating part to the sealing film.

9. The differential double heat-sealing device according to any one of claims 1 to 7, characterized in that the elastic coefficient of the outer heating component pushing spring is greater than the elastic coefficient of the inner heating component pushing spring, and the deformation length of the outer heating component pushing spring when the outer sealing film heating part contacts the container mouth is equal to the deformation length of the inner heating component pushing spring when the inner sealing film heating part contacts the sealing film, so that the heat-sealing pressure applied by the outer sealing film heating part to the sealing film is greater than the heat-sealing pressure applied by the inner sealing film heating part to the sealing film.

10. The differential double heat-sealing device according to any one of claims 1 to 7, characterized in that the elastic coefficient of the outer heating component pushing spring is greater than the elastic coefficient of the inner heating component pushing spring, and the deformation length of the outer heating component pushing spring when the outer sealing film heating part contacts the container mouth is greater than the deformation length of the inner heating component pushing spring when the inner sealing film heating part contacts the sealing film, so that the heat-sealing pressure applied by the outer sealing film heating part to the sealing film is greater than the heat-sealing pressure applied by the inner sealing film heating part to the sealing film.

11. The differential double heat-sealing device according to any one of claims 1 to 7, characterized in that the elastic coefficient of the outer heating component pushing spring is less than the elastic coefficient of the inner heating component pushing spring, the deformation length of the outer heating component pushing spring when the outer sealing film heating part contacts the container mouth is greater than the deformation length of the inner heating component pushing spring when the inner sealing film heating part contacts the sealing film, and the product of the elastic coefficient and the deformation length of the outer sealing film heating part is greater than the product of the elastic coefficient and the deformation length of the inner sealing film heating part, so that the heat-sealing pressure applied by the outer sealing film heating part to the sealing film is greater than the heat-sealing pressure applied by the inner sealing film heating part to the sealing film.

12. A sealing machine for sealing a container opening with a sealing film in a heat-sealing manner, the sealing machine comprising: The differential double heat-sealing device, the lower container support part, and the pressing device according to any one of claims 1 to 11, characterized in that the lower container support part is used to support and fix the container to be sealed, so that the container mouth of the container is positioned towards the outer sealing film heating part and the inner sealing film heating part; the pressing device is used to actuate the plurality of outer heating component pushing springs and the plurality of inner heating component pushing springs, so as to push the outer sealing film heating part and the inner sealing film heating part towards the lower container support part, so as to heat-seal and contact the outer sealing film heating part and the inner sealing film heating part with the sealing film and the container mouth.

13. The sealing machine according to claim 12, wherein The pressing device includes: An actuating part for receiving external power; A spring pressing part fixedly connected to the actuating part to transmit the external power to the outer heating component pushing spring and the inner heating component pushing spring; and A plurality of spring guides, one end of each of the plurality of spring guides is fixedly connected to the corresponding blind hole and the inner heating component spring support part, the other end of the spring guide passes through the spring pressing part, and a detachable limiting part is installed, so that the spring guide can move relative to the spring pressing part, wherein, The number of the spring guides is equal to the sum of the number of the blind holes and the inner heating component spring support parts, the outer heating component pushing spring and the inner heating component pushing spring are sleeved on the spring guides, so that both ends of the outer heating component pushing spring and the inner heating component pushing spring respectively abut between the outer heating component and the inner heating component and the spring pressing part; The limiting part can axially move relative to the spring guide to adjust the initial lengths of the outer heating component pushing spring and the inner heating component pushing spring.

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