Packaging box heat sealing equipment and packaging box welding production line

Abstract

This utility model provides a packaging box heat-sealing device and a packaging box welding and sealing production line, relating to the field of heat-sealing packaging technology. The packaging box heat-sealing device includes a lower pressure block, an electric heating component, a second mounting base, and a lifting mechanism. The lower pressure block is fixed to the first mounting base. The electric heating component is connected to the lower pressure block and includes four heating tubes inserted horizontally inside the lower pressure block, with the four heating tubes enclosing a rectangular area in the middle. A clearance groove is provided on the lower surface of the lower pressure block corresponding to the rectangular area, and the portion of the lower surface of the lower pressure block surrounding the clearance groove forms a heat-sealing section. The second mounting base is located below the lower pressure block. The lifting mechanism is installed on the second mounting base, and its actuator is fixedly connected to the first mounting base, driving the first mounting base to lift and lower the lower pressure block. This utility model at least alleviates the technical problem in the prior art where sealing equipment easily causes accidental heating of the non-sealed area in the middle of the packaging box, affecting product safety and appearance quality. It also facilitates maintenance and reduces maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of heat-sealing packaging technology, and in particular to a packaging box heat-sealing device and a packaging box welding and sealing production line. Background Technology

[0002] In the prior art, when sealing a packaging box, the reinforcing paper is usually fixed to the opening of the packaging box by heat pressing using a sealing device. The process usually includes: covering the upper surface of the opening of the packaging box with reinforcing paper, starting the sealing device, and driving the lower pressure block to descend through its drive mechanism to apply pressure and heat to the edge area of ​​the reinforcing paper and the packaging box, thereby achieving sealing.

[0003] In the prior art, the bottom surface of the pressure block of the sealing equipment is a flat structure, which can easily cause unnecessary heating to the middle area of ​​the packaging box during the heat sealing process, affecting the safety and appearance quality of the items inside the packaging box. Utility Model Content

[0004] The purpose of this utility model is to provide a packaging box heat sealing device and a packaging box welding and sealing production line to alleviate the technical problem that the sealing equipment in the prior art is prone to accidentally heating the non-sealing area in the middle of the packaging box, which affects the product safety and appearance quality.

[0005] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions: In a first aspect, embodiments of the present invention provide a heat-sealing device for packaging boxes, comprising: A pressure block is fixed to a mounting base one, and the pressure block is made of a heat-conducting material; An electric heating assembly, connected to the lower pressure block to heat the lower pressure block, includes four heating tubes that pass through the lower pressure block in a horizontal direction, with the four heating tubes enclosing a rectangular area in the middle; a relief groove is provided on the lower surface of the lower pressure block at a location corresponding to the rectangular area, and a heat-welded part is formed on the lower surface of the lower pressure block surrounding the relief groove; Mounting base two is located below the lower pressure block; A lifting mechanism is installed on the second mounting base, and the execution end of the lifting mechanism is fixedly connected to the first mounting base. The lifting mechanism drives the first mounting base to lift and lower the lower pressure block.

[0006] In an optional embodiment, the electric heating assembly further includes a temperature controller and a thermocouple; the thermocouple is inserted into the lower pressure block; both the thermocouple and the heating tube are electrically connected to the temperature controller; the thermocouple measures the temperature of the lower pressure block and transmits the measured temperature information to the temperature controller, and the temperature controller receives the temperature information and controls the switching on and / or heating power of the heating tube.

[0007] In an optional implementation, each pair of parallel heating tubes is considered as a group of heating tubes, and in the four heating tubes, one group of heating tubes is on a different horizontal plane from the other group of heating tubes.

[0008] In an optional embodiment, the packaging box heat sealing device further includes a support frame; the support frame includes a base frame and multiple support columns, the base frame is fixedly installed on the execution end of the lifting mechanism, the lower ends of the multiple support columns are fixedly connected to the base frame, and the upper ends of the multiple support columns are fixedly connected to the mounting base; the lifting mechanism drives the support frame to rise and fall, along with the mounting base, thereby driving the lower pressure block to rise and fall.

[0009] In an optional embodiment, the lifting mechanism includes a cylinder and a piston rod; the cylinder is fixedly installed on the mounting base two with its cavity opening facing downwards, one end of the piston rod is inserted into the cavity of the cylinder, and the other end of the piston rod is fixedly connected to the base frame as the actuating end.

[0010] In an optional embodiment, a buffer is mounted on the base frame, with the impact-bearing end of the buffer facing downwards.

[0011] In an optional embodiment, the packaging box heat sealing device further includes a mounting plate, the thickness direction of which extends vertically, and the plane containing the length and width directions extends horizontally; the support column passes through a vertical through hole provided on the mounting plate, and the mounting base is fixedly connected to the lower surface of the mounting plate.

[0012] In an optional embodiment, each of the support columns is fitted with a guide sleeve, the lower end of which is fixedly connected to the mounting plate.

[0013] In an optional embodiment, at least one guide post is provided between each pair of adjacent support posts; the guide post passes through a perforation provided on the mounting plate, the upper end of the guide post is fixedly connected to the mounting base, and the lower end of the guide post is suspended.

[0014] Secondly, this utility model provides a packaging box welding and sealing production line, including a horizontal conveyor belt and a packaging box heat sealing device provided in any of the optional embodiments of the first aspect; the horizontal conveyor belt is mounted below the lower pressure block to convey and support the packaging box, and the mounting base is located below the horizontal conveyor belt.

[0015] The embodiments of this utility model can achieve at least the following beneficial effects: In operation, a packaging box welding and sealing production line is provided, which includes a horizontal conveyor belt and the aforementioned packaging box heat sealing device; the mounting base is fixedly connected to the worktable, and the horizontal conveyor belt is erected above the worktable and below the pressure block to convey and support the packaging box; alternatively, the horizontal conveyor belt can be omitted, and the pressure block can be positioned above the worktable, with a pushing mechanism provided on the side of the worktable. The pushing mechanism pushes the packaging box with reinforcing paper covering the opening to the bottom of the pressure block, and after completing the heat sealing of the packaging box, the packaging box is pushed out, and the next packaging box is pushed to the bottom of the pressure block.

[0016] The pressure block is heated by the electric heating component. When the packaging box covered with reinforcing paper is located below the pressure block, the lifting mechanism drives the mounting base to rise and fall, thereby lifting and lowering the pressure block. When the hot-welded part (the part surrounding the relief groove) on the lower surface of the pressure block presses against the edge of the packaging box, the reinforcing paper can be hot-pressed to the opening edge of the packaging box, thus achieving a hot-welded seal for the packaging box.

[0017] In the packaging box heat sealing device provided in this embodiment of the utility model, by providing an avoidance groove on the lower surface of the lower pressure block, the lower pressure block can avoid the middle area of ​​the packaging box when it is pressed down, so that the heat welding part (the part surrounding the avoidance groove) on the lower surface of the lower pressure block only acts on the edge area of ​​the packaging box, avoiding unnecessary heating of the middle area of ​​the packaging box, thereby effectively preventing the contents of the packaging box from deforming, discoloring or being damaged due to heat, improving the safety of the items inside the packaging box, the sealing quality of the packaging box edges and the appearance quality of the packaging box after sealing; Meanwhile, in this embodiment of the utility model, four heating tubes are installed horizontally inside the lower pressure block to form a rectangular heating area. Each heating tube is installed independently, which makes it easy to replace each heating tube individually. This convenient replacement reduces maintenance time and costs.

[0018] In addition, this utility model embodiment also provides several optional implementation methods. The specific implementation method section of this specification will provide a detailed description and explanation of the specific structure and functional effects of these optional implementation methods. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1A schematic diagram of the overall structure of the packaging box heat sealing device provided in this embodiment of the utility model (mounting plate not shown). Figure 2 A schematic diagram showing the positional relationship between the lower pressure block and the packaging box in the working state of the packaging box heat sealing device provided in this embodiment of the utility model; Figure 3 A schematic diagram showing the assembly relationship between the mounting base, the lower pressure block, and the thermocouple and heating tube in the electric heating assembly in the packaging box heat sealing device provided in this embodiment of the utility model. Figure 4 for Figure 3 Side view of the structure shown; Figure 5 for Figure 4 Sectional view along axis AA; Figure 6 for Figure 4 BB-direction sectional view; Figure 7 A schematic diagram of the overall structure of the packaging box welding and sealing production line provided in this embodiment of the utility model. Figure 1 ; Figure 8 A schematic diagram of the overall structure of the packaging box welding and sealing production line provided in this embodiment of the utility model. Figure 2 .

[0021] Icons: 100-Packaging box; 1-Mounting base one; 2-Pressing block; 201-Allowing groove; 31-Temperature controller; 32-Thermocouple; 33-Heating tube; 4-Mounting base two; 5-Lifting mechanism; 51-Cylinder; 52-Piston push rod; 6-Support frame; 61-Base frame; 62-Support column; 7-Buffer; 8-Mounting plate; 9-Guide sleeve; 10-Guide column; 11-Horizontal conveyor belt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the accompanying drawings indicate similar items. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, the terms "horizontal" and "vertical" do not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] First aspect This embodiment provides a packaging box heat sealing device, referring to... Figures 1 to 3 The packaging box heat sealing device includes a lower pressure block 2, an electric heating component, a mounting base 4, and a lifting mechanism 5.

[0030] Specifically: the lower pressure block 2 is fixed to the mounting base 1, and the lower pressure block 2 is made of metal, engineering ceramics or other heat-conducting materials; the electric heating component is connected to the lower pressure block 2 to heat the lower pressure block 2, including four heating tubes 33 that are inserted horizontally inside the lower pressure block 2, and the four heating tubes 33 enclose a rectangular area in the middle; the lower surface of the lower pressure block 2 is provided with a relief groove 201 corresponding to the rectangular area, and the part of the lower surface of the lower pressure block 2 that surrounds the relief groove 201 forms a heat-welded part; the mounting base 2 4 is located below the lower pressure block 2; the lifting mechanism 5 is installed on the mounting base 2 4, and the execution end of the lifting mechanism 5 is fixedly connected to the mounting base 1, and the lifting mechanism 5 drives the mounting base 1 to lift the lower pressure block 2.

[0031] When working, refer to Figure 7 and Figure 8 A packaging box welding and sealing production line is provided, which includes a horizontal conveyor belt 11 and the aforementioned packaging box heat sealing device; the mounting base 2 4 is fixedly connected to the worktable, and the horizontal conveyor belt 11 is mounted above the worktable and located below the lower pressure block 2 to convey and support the packaging box 100; alternatively, the horizontal conveyor belt 11 can be omitted, and the lower pressure block 2 can be located above the worktable, with a pushing mechanism provided on the side of the worktable, which pushes the packaging box with the opening covered with reinforcing paper to the lower pressure block 2, and pushes the packaging box out after completing the heat sealing of the packaging box, and pushes the next packaging box to the lower pressure block 2.

[0032] The lower pressure block 2 is heated by the electric heating component. When the packaging box covered with reinforcing paper is located below the lower pressure block 2, the lifting mechanism 5 drives the mounting base 1 to rise and fall, thereby lifting and falling the lower pressure block 2. When the hot-welded part (the part surrounding the relief groove 201) on the lower surface of the lower pressure block 2 is pressed against the edge of the packaging box, the reinforcing paper can be hot-pressed to the opening edge of the packaging box to achieve the hot-welding seal of the packaging box.

[0033] In the packaging box heat sealing device provided in this embodiment, by providing an avoidance groove 201 on the lower surface of the lower pressure block 2, the lower pressure block 2 can avoid the middle area of ​​the packaging box 100 when it is pressed down, so that the heat welding part (the part surrounding the avoidance groove 201) on the lower surface of the lower pressure block 2 only acts on the edge area of ​​the packaging box 100, avoiding unnecessary heating of the middle area of ​​the packaging box 100, thereby effectively preventing the contents of the packaging box 100 from deforming, discoloring or being damaged due to heat, improving the safety of the items inside the packaging box, the sealing quality of the packaging box edges and the appearance quality of the packaging box after sealing; Meanwhile, four heating tubes 33 are installed horizontally inside the lower pressure block 2 to form a rectangular heating area. Each heating tube 33 is installed independently, which makes it easy to replace each heating tube 33 individually. This convenient replacement reduces maintenance time and costs.

[0034] In an optional embodiment of this example, the electric heating assembly further includes a temperature controller 31 and a thermocouple 32; the thermocouple 32 is inserted into the lower pressure block 2; both the thermocouple 32 and the heating tube 33 are electrically connected to the temperature controller 31; the thermocouple 32 measures the temperature of the lower pressure block 2 and transmits the temperature information to the temperature controller 31; the temperature controller 31 receives the temperature information and controls the switching on and / or heating power of the heating tube 33 according to the temperature information. Here, "and / or" means that the temperature controller 31 can simultaneously control the opening and closing of the heating tube 33 and adjust the magnitude of the heating power. Alternatively, the temperature controller 31 can be designed to only control the heating power of the heating tube 33, while a separate power switch controls the opening and closing of the heating tube 33. Or, the temperature controller 31 can only control the opening and closing of the heating tube 33 and cannot adjust the magnitude of the heating power. In this case, the temperature during hot pressing is fixed.

[0035] Reference Figure 4 , Figure 5 and Figure 6 In an optional embodiment of this example, each pair of parallel heating tubes 33 is considered as a group of heating tubes 33. Among the four heating tubes 33 inserted inside the lower block 2, one group of heating tubes 33 is at a different horizontal plane from another group of heating tubes 33.

[0036] In this optional embodiment, by dividing the four heating tubes 33 into two groups and setting them on different horizontal planes, the temperature of the lower surface of the lower pressing block 2 corresponding to the lower heating tube 33 is higher than the temperature of the lower surface of the upper heating tube 33 corresponding to the upper heating tube 33. This temperature gradient distribution design can achieve differentiated hot-pressing bonding effects in different parts when hot-pressing the edge area of ​​the packaging box. Specifically, when hot-pressing the edge area of ​​the packaging box, the hot-pressing bonding effect of the lower pressing block 2 and the upper heating tube 33 on the reinforcing paper of the edge area of ​​the packaging box is slightly lower than that of the lower pressing block 2 and the lower heating tube 33 on the reinforcing paper of the edge area of ​​the packaging box. This provides an easy-to-tear position for the subsequent process of tearing the reinforcing paper. Especially in the filling process of medical device drugs, this design can ensure that the reinforcing paper is easy to peel off at the position that needs to be torn, thereby improving operational efficiency and product quality.

[0037] In an optional embodiment of this example, the packaging box heat sealing device further includes a support frame 6. Specifically, the support frame 6 includes a base frame 61 and multiple support columns 62 extending vertically. The base frame 61 is fixedly installed on the execution end of the lifting mechanism 5. The lower ends of the multiple support columns 62 are fixedly connected to the base frame 61, and the upper ends of the multiple support columns 62 are fixedly connected to the mounting base 1. The lifting mechanism 5 drives the support frame 6 to rise and fall, along with the mounting base 1, thereby driving the lower pressure block 2 to rise and fall.

[0038] In this optional embodiment, the mounting base 2 4 can be fixed to the bottom of the workbench, and the lower part of the base frame 61 of the lifting mechanism 5 and the support frame 6 and the lower part of each support column 62 can be assembled under the workbench, forming a multi-level layout structure along the vertical direction together with the mounting base 1 and the lower pressure block 2, thereby saving the space occupied by the device and facilitating the space optimization of the production line.

[0039] Further optionally, the lifting mechanism 5 has various optional structural types, such as, but not limited to, including a cylinder 51 and a piston rod 52; the cylinder 51 is fixedly installed on the mounting base 4 with its cavity opening facing downwards, one end of the piston rod 52 is inserted into the cavity of the cylinder 51, and the other end of the piston rod 52 is fixedly connected to the base frame 61 as the actuating end. In this optional embodiment, by pushing and pulling the piston rod 52 downwards, the upper structure (mounting base 1 and lower pressure block 2) is driven to rise and fall under the linkage of the support frame, effectively reducing the space occupied by the device in the horizontal direction. This vertical layout design makes the entire device more compact, which is conducive to the space optimization of the production line. Especially in a limited working space, it can better integrate other production equipment and improve the overall layout efficiency of the production line. At the same time, the combined structure of the cylinder 51 and the piston rod 52 is stable and reliable during operation and is not prone to failure.

[0040] Optionally, a buffer 7 is also installed on the base frame 61, with the impact-receiving end of the buffer 7 facing downwards. The buffer 7 is a commonly used anti-impact buffer structure in the prior art. The buffer is usually filled with compressed gas (such as nitrogen) or liquid (such as oil). When the impact-receiving end is impacted, the gas or liquid inside is compressed, thereby absorbing the impact energy. Some buffers also have damping elements inside, such as pistons and damping holes. When the gas or liquid is compressed, it will generate a damping effect through the damping holes, further reducing the impact force. After the impact force disappears, the compressed gas or liquid will gradually return to its original state, pushing the piston back to the initial position. In this optional embodiment, by installing a buffer 7 on the base frame 61 with the impact-receiving end of the buffer 7 facing downwards, the descent speed and final position of the support frame 6 can be smoothly controlled. When the lifting mechanism 5 drives the support frame 6 to descend, it can effectively absorb and disperse the impact force, reduce the damage to the support frame or packaging box caused by sudden stop or impact, extend the service life of the device, and protect the packaging box from damage, improving the sealing quality of the packaging box.

[0041] Optionally, the packaging box heat-sealing device further includes a mounting plate 8, the thickness direction of which extends vertically, and the planes containing the length and width directions which extend horizontally; a support column 62 passes through a vertical through hole provided on the mounting plate 8, and a mounting base 4 is fixedly connected to the lower surface of the mounting plate 8. In this optional embodiment, the mounting plate 8 can be used as a workbench or fixedly installed on a workbench. Because the mounting plate 8 provides stable support and a flat working surface, the entire device operates more smoothly, reducing failures and downtime caused by structural instability. This stable operating state not only improves production efficiency but also ensures the continuity and stability of the production line, which is suitable for the needs of high-speed automated production lines. Optionally, the temperature controller 31 mentioned in some of the aforementioned optional embodiments can be fixedly installed on the mounting plate 8.

[0042] In an optional embodiment of this example, each support column 62 is fitted with a guide sleeve 9, the lower end of which is fixedly connected to the mounting plate 8. In this optional embodiment, the introduction of the guide sleeve 9 allows the support column 62 to move along a fixed path during lifting and lowering, reducing errors caused by offset or swaying of the support column 62. This high-precision guiding effect ensures that the contact position between the lower pressure block 2 and the edge area of ​​the packaging box is consistent during each heat-sealing process, thereby improving the quality and consistency of the sealing and reducing sealing defects caused by mechanical deviations.

[0043] In an optional embodiment of this example, at least one guide post 10 extending vertically is provided between each pair of adjacent support columns 62. The guide post 10 passes through a perforation on the mounting plate 8, with its upper end fixedly connected to the mounting base 1 and its lower end suspended. In this optional embodiment, the guide post 10 extends vertically and passes through the perforation on the mounting plate 8, which can further prevent the support columns 62 from shifting or swaying during the lifting and lowering process relative to the mounting plate 8, thereby improving the operational stability of the device. At the same time, the guide post 10 is located between adjacent support columns 62, making full use of the structural gaps without occupying additional space, resulting in a more compact device structure and more efficient and rational space utilization.

[0044] In an optional embodiment of this example, each guide post 10 is fitted with a guide sleeve 9, and the lower end of the guide sleeve 9 is fixedly connected to the mounting plate 8. In this optional embodiment, the guide sleeve 9 fitted on the outside of the guide post 10 provides limiting and guiding for the guide post 10, preventing the guide post 10 from deviating or shaking during the lifting and lowering process relative to the mounting plate 8, further improving the lifting and lowering stability. At the same time, the guide sleeve 9 fitted on the outside of the guide post 10, as an intermediate component, can effectively reduce the direct contact and friction between the guide post 10 and the mounting plate 8, reduce wear, and extend the service life of the component.

[0045] Second aspect This embodiment provides a packaging box welding and sealing production line, which includes a horizontal conveyor belt 11 and a packaging box heat sealing device provided in any optional embodiment of the first aspect; the horizontal conveyor belt 11 is mounted below the lower pressure block 2 to convey and support the packaging box 100, and the mounting base 2 4 is located below the horizontal conveyor belt 11.

[0046] For details on its working method, the more specific structure of the packaging box heat sealing device involved, and the effects that can be achieved, please refer to the optional or preferred embodiments in the first aspect.

[0047] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. The above embodiments in this specification are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A heat-sealing device for packaging boxes, characterized in that, include: The pressure block (2) is fixed to the mounting base (1), and the pressure block (2) is made of heat-conducting material; An electric heating assembly is connected to the lower pressure block (2) to heat the lower pressure block (2), including four heating tubes (33) that are inserted horizontally inside the lower pressure block (2), and the four heating tubes (33) enclose a rectangular area in the middle; the lower surface of the lower pressure block (2) is provided with a relief groove (201) at the part corresponding to the rectangular area, and the part of the lower surface of the lower pressure block (2) surrounding the relief groove (201) forms a heat-welded part; Mounting base 2 (4) is located below the pressing block (2); The lifting mechanism (5) is installed on the second mounting base (4), and the execution end of the lifting mechanism (5) is fixedly connected to the first mounting base (1). The lifting mechanism (5) drives the first mounting base (1) to lift and lower the pressure block (2).

2. The packaging box heat-sealing device according to claim 1, characterized in that, The electric heating assembly also includes a temperature controller (31) and a thermocouple (32); The thermocouple (32) is inserted into the pressure block (2); The thermocouple (32) and the heating tube (33) are both electrically connected to the temperature controller (31); the thermocouple (32) measures the temperature of the lower pressure block (2) and transmits the measured temperature information to the temperature controller (31), and the temperature controller (31) receives the temperature information and controls the switching and / or heating power of the heating tube (33).

3. The packaging box heat-sealing device according to claim 1, characterized in that, Each pair of parallel heating tubes (33) is considered as a group of heating tubes (33). Among the four heating tubes (33), one group of heating tubes (33) is on a different horizontal plane from another group of heating tubes (33).

4. The packaging box heat-sealing device according to claim 1, characterized in that, The packaging box heat sealing device also includes a support frame (6). The support frame (6) includes a base frame (61) and multiple support columns (62). The base frame (61) is fixedly installed on the execution end of the lifting mechanism (5). The lower ends of the multiple support columns (62) are fixedly connected to the base frame (61), and the upper ends of the multiple support columns (62) are fixedly connected to the mounting base (1). The lifting mechanism (5) drives the support frame (6) to rise and fall, and carries the mounting base (1) to rise and fall, thereby driving the lower pressure block (2) to rise and fall.

5. The packaging box heat-sealing device according to claim 4, characterized in that, The lifting mechanism (5) includes a cylinder (51) and a piston rod (52); the cylinder (51) is fixedly installed on the mounting base (4) with its cavity opening facing downwards, one end of the piston of the piston rod (52) is inserted into the cavity of the cylinder (51), and the other end of the piston rod (52) is fixedly connected to the base frame (61) as the execution end.

6. The packaging box heat-sealing device according to claim 4, characterized in that, A buffer (7) is installed on the base frame (61), with the impact end of the buffer (7) facing downward.

7. The packaging box heat-sealing device according to claim 4, characterized in that, The packaging box heat sealing device also includes a mounting plate (8), the thickness direction of which extends vertically, and the plane containing the length and width directions extends horizontally; the support column (62) passes through the vertical through hole provided on the mounting plate (8), and the mounting seat (4) is fixedly connected to the lower plate surface of the mounting plate (8).

8. The packaging box heat-sealing device according to claim 7, characterized in that, Each of the support columns (62) is fitted with a guide sleeve (9), and the lower end of the guide sleeve (9) is fixedly connected to the mounting plate (8).

9. The packaging box heat-sealing device according to claim 7, characterized in that, At least one guide post (10) is provided between each pair of adjacent support posts (62). The guide post (10) passes through the perforation provided on the mounting plate (8), the upper end of the guide post (10) is fixedly connected to the mounting base (1), and the lower end of the guide post (10) is suspended.

10. A packaging box welding and sealing production line, characterized in that, The device includes a horizontal conveyor belt (11) and a heat-sealing device for packaging boxes according to any one of claims 1 to 9; the horizontal conveyor belt (11) is mounted below the lower pressure block (2) to convey and support the packaging box (100), and the mounting base (4) is located below the horizontal conveyor belt (11).

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