A keel thermoplastic packaging device

Abstract

This invention provides a keel-type thermoplastic packaging device, belonging to the field of keel-type thermoplastic packaging technology. It includes a side-sealing machine, a thermoplastic machine, and a receiving roller conveyor. The thermoplastic machine includes an oven and an insulated box located outside it. The oven has a conveying mechanism for transporting sealed workpieces, and heating pipes are installed on both sides and the bottom of the oven's inner wall. Symmetrically fixed partitions are connected inside the oven, forming a pre-treatment channel. A film-forming assembly is installed within this channel, comprising a mounting frame that slides up and down between two partitions and a top plate mounted at its bottom. This invention creates an electrostatic field within the pre-treatment channel through the top and side plates of the film-forming assembly. Before the film enters the main shrinkage zone, it can be shaped and evenly adhered to the workpiece surface, reducing the tensile force on the rear film caused by the front shrinking first and preventing tensile wrinkles due to differences in shrinkage sequence.

Description

Technical Field

[0001] This invention relates to the field of keel thermoplastic packaging technology, and particularly to a keel thermoplastic packaging device. Background Technology

[0002] The keel thermoplastic packaging device is an automated packaging equipment used for building keel profiles. It typically consists of a feeding belt conveyor, a sealing and cutting machine, a transition belt conveyor, a thermoplastic machine, and a roller conveyor. Its working process is as follows: the film feeding mechanism wraps the film around the keel bundle, the sealing and cutting machine seals the film to form a sealed film bag, and then the film enters the thermoplastic machine where the film shrinks and adheres tightly to the keel under the action of circulating hot air, thus completing the packaging. In practical applications, especially when processing long keels several meters in length, existing equipment of this type often suffers from problems. The front end enters the thermoforming machine first, and when it reaches the shrinkage temperature point, the film on it quickly tightens. Meanwhile, the rear end of the workpiece may still be at room temperature or preheated. The shrinking film at the front end exerts a forward tensile force on the unshrinked film at the rear end through the film itself. Simultaneously, due to the turbulence of the circulating airflow within the oven, irregular initial wrinkles often form on the top and sides of the keel. These wrinkles are locked in or even amplified during the subsequent high-temperature shrinkage stage, resulting in an uneven final packaging surface. Therefore, this application provides a keel thermoforming packaging device to meet these requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a keel thermoplastic packaging device to solve the above-mentioned problems. By forming an electrostatic field in the pretreatment channel through the top and side plates on the film-feeding assembly, the film in the channel can be sorted before entering the main shrinkage zone, so that it is synchronously and smoothly attached to the workpiece surface. This reduces the tensile force on the film at the rear end caused by the front end shrinking first, and prevents tensile wrinkles caused by differences in shrinkage sequence. It solves the problem mentioned in the background art that the film bag forms irregular initial wrinkles on the top and sides of the keel. These wrinkles are locked or even amplified in the subsequent high-temperature shrinkage stage, resulting in an uneven final packaging surface.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A keel thermoplastic packaging device includes a side sealing machine, a thermoplastic machine, and a receiving roller conveyor. The thermoplastic machine includes an oven and an insulated box disposed on its outer side. The oven is equipped with a conveying mechanism for conveying the sealed workpiece. Heating pipes are provided on both sides and the bottom of the inner wall of the oven. Partitions are symmetrically fixedly connected inside the oven. The oven and the partitions enclose a pre-treatment channel, in which a film-forming assembly is disposed. The film preparation assembly includes a mounting frame that slides up and down between two partitions and a top plate mounted at its bottom. The top plate has a transverse groove with a bottom opening. An adjustment frame is slidably connected to the side of the two partitions that are close to each other, and a side plate is rotatably connected to the side of the adjustment frame that is close to each other. The side plate has a vertical groove with a lateral opening, and the top of the side plate has an arc-shaped part. Electrodes are embedded in the top plate and the side plate. The electrodes are used to connect to an electrostatic generator to form an electrostatic field on the surface of the top plate and the side plate. This causes the packaging film entering the pretreatment channel to be adsorbed and adhered to the workpiece surface along the guide of the transverse groove and the vertical groove. The film is adsorbed by the electrostatic field, and the groove structure guides the film to adhere smoothly to the workpiece surface. This ensures that the film has formed a smooth and adhered initial state before shrinkage, reducing the stretching wrinkles at the rear end caused by the front end shrinking first. The thermoplastic machine is equipped with an adjustment component for adjusting the spacing between the side plates.

[0005] Based on the above scheme, longitudinal beams are symmetrically fixedly connected inside the mounting frame, and connecting rods are fixedly connected to the top of the longitudinal beams. A cylinder is fixedly connected to the top of the insulation box, and the telescopic end of the cylinder is fixedly connected to the top of the connecting rod. The overall lifting and lowering adjustment of the top plate is realized by the cylinder drive, which is convenient to adapt to workpieces of different heights and specifications, and improves adjustment efficiency and automation.

[0006] Furthermore, the longitudinal beam is symmetrically slidably connected with sliding rods, which are fixedly connected to the top of the top plate. A spring is sleeved on the outside of the sliding rods and between the top plate and the longitudinal beam, so that the top plate has an elastic floating function, which can adapt to the local unevenness of the workpiece surface, avoid the top plate from being blocked or the film damaged due to the protrusion of the workpiece surface (such as cable ties), and improve the operational stability.

[0007] Optionally, the adjustment assembly includes a stepper motor, a synchronous belt assembly, and a bidirectional lead screw; the stepper motor is fixed outside the insulation box, and its output shaft drives the bidirectional lead screw to rotate through the synchronous belt assembly. The bidirectional lead screw is threadedly connected to two adjustment frames, and synchronous symmetrical adjustment of the two side plates is achieved through motor drive, which is suitable for rapid switching of workpieces of different specifications.

[0008] Optionally, multiple elastic elements are fixedly connected between the adjustment frame and the side plate. The side plate can rotate around the connection point between itself and the adjustment frame. The elastic elements provide the side plate with an elastic preload towards the workpiece and allow it to swing outward when squeezed by the workpiece. This allows the side plate to have a certain swing margin and elastic pressing capability, enhancing its adaptability to irregular workpiece sides and preventing the film from being improperly arranged or damaged due to workpiece offset or shaking.

[0009] Compared with the prior art, the present invention has at least the following beneficial effects: In the above solution, the keel thermoplastic packaging device provided in this application forms an electrostatic field in the pretreatment channel through the top plate and side plate on the film handling component. Before the film enters the main shrinkage zone, the film in the channel can be sorted so that it is synchronously and flatly attached to the surface of the workpiece, which reduces the stretching force on the film at the rear end due to the front end shrinking first and prevents tensile wrinkles caused by the difference in shrinkage sequence. The horizontal grooves on the top plate and the vertical grooves on the side plates can guide the adsorbed film, allowing it to extend and be positioned along the length and vertical direction of the keel. This design can further constrain and resist the disturbance of the circulating airflow inside the oven, stabilizing the initial shape of the film. By adjusting the height of the top plate with a cylinder and adjusting the distance between the two side plates with an adjustment component, the pretreatment mechanism can quickly adapt to keel bundles with different cross-sectional dimensions, ensuring the consistency of the film treatment effect for workpieces of different specifications. Attached Figure Description

[0010] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0011] Figure 1 This is an overall schematic diagram of the keel thermoplastic packaging device of the present invention; Figure 2 This is a three-dimensional schematic diagram of the side sealing machine of the present invention; Figure 3 This is a schematic diagram of the internal structure of the thermoplastic machine of the present invention; Figure 4 This is a cross-sectional view of the thermoplastic machine of the present invention; Figure 5 This is a schematic diagram of the film-forming component and the adjustment component of the present invention; Figure 6 This is a schematic diagram showing the connection between the mounting bracket and the top plate of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8 This is a bottom view of the top plate of the present invention; Figure 9 This is a schematic diagram showing the connection between the adjustment frame and the side plate of the present invention.

[0012] Figure label: 1. Side sealing machine; 101. Machine body; 102. Feeding belt conveyor; 103. Feeding belt conveyor; 104. Horizontal sealing mechanism; 105. Longitudinal seam mechanism; 106. Waste collection mechanism; 107. Film dispensing mechanism; 108. Pin wheel; 2. Thermoplasticizer; 201. Oven; 202. Conveying mechanism; 203. Heating element; 204. Insulation box; 205. Drive motor; 206. Fan wheel; 3. Receiving roller conveyor; 4. Partition; 5. Membrane assembly; 51. Mounting bracket; 511. Longitudinal beam; 512. Connecting rod; 52. Top plate; 521. Horizontal groove; 522. Slide rod; 523. Spring; 53. Adjusting bracket; 54. Side plate; 541. Vertical groove; 55. Elastic element; 6. Cylinder; 7. Adjustment components; 701. Stepper motor; 702. Synchronous belt assembly; 703. Two-way lead screw.

[0013] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0014] The keel thermoplastic packaging device provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0015] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0016] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0017] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0018] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0019] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a keel thermoplastic packaging device, including a side sealing machine 1, a thermoplastic machine 2, and a receiving roller conveyor 3. The side sealing machine 1 is used to complete the film covering, sealing, and trimming operations of the keel. The receiving roller conveyor 3 is used to receive the keel that has been thermoplastic packaged from the thermoplastic machine 2. The side sealing machine 1 includes a machine body 101 and a feeding belt conveyor 102 and a conveyor belt 103 disposed on its top. A transverse sealing mechanism 104 is disposed between the feeding belt conveyor 102 and the conveyor belt 103 for sealing and cutting the film bag at the end of the keel. A longitudinal sewing mechanism 105 is disposed on the top of the machine body 101 and on one side of the conveyor belt 103 for sealing and cutting the film bag on the side of the keel. An air blowing assembly is also disposed on the top of the machine body 101 for blowing air onto the longitudinal sewing machine. While the film is being cut and sealed by the sewing mechanism 105, a suitable amount of air is blown into the film bag to make the film bag slightly bulging and full, providing a uniform initial shape for subsequent heat shrinkage. The machine body 101 is equipped with a waste collection mechanism 106, which includes a receiving tray and a drive device for rotating it to automatically wind and collect the waste film cut by the longitudinal sewing mechanism 105. A film feeding mechanism 107 is provided on the top of the machine body 101 and on one side of the feeding belt 102. A needle wheel 108 is provided on one side of the film feeding mechanism 107. When feeding the film, the needle wheel 108 punctures the film bag to form evenly distributed vent holes. During the subsequent thermoplasticizing process, the gas in the film bag can be discharged in an orderly manner from these vent holes to ensure that the film can be tightly and bubble-free adhered to the keel surface.

[0020] In this embodiment, as Figure 3As shown, the thermoplastic machine 2 includes an oven 201 and an insulated box 204 disposed on its outer side. The oven 201 is equipped with a conveying mechanism 202 for conveying the sealed keel. In order to meet the requirements of uniform heating of long keels, heating tubes 203 are arranged in an array on both sides and bottom of the inner wall of the oven 201 to provide a heat source around the keel. Multiple drive motors 205 are fixedly connected to the top of the insulated box 204. The output shaft of the drive motor 205 extends into the oven 201 and is fixedly connected to a fan wheel 206. Multiple fan wheels 206 are arranged in an array along the length of the oven 201. During operation, the fan wheel 206 draws in air from the lower part of the oven 201 and blows it toward the array of heating tubes 203 on both sides and bottom. The heated air forms a forced hot air circulation that blows from top to bottom toward the surface of the keel, ensuring that the keel can obtain uniform heat. In this embodiment, as Figures 4 to 6 As shown, to actively intervene in the shape of the film before heat shrinking and prevent wrinkles caused by softening and sagging, symmetrical partitions 4 are fixedly connected inside the oven 201. The oven 201 and the partitions 4 enclose a pretreatment channel, in which a film-forming assembly 5 is installed. The film-forming assembly 5 includes a mounting bracket 51 that slides up and down between the two partitions 4 and a top plate 52 installed at its bottom. Figure 8 As shown, the top plate 52 has a horizontal groove 521 with a bottom opening. The two partitions 4 are slidably connected to the side of each other, and the side of each side of the adjustment frame 53 is rotatably connected to the side of each side of the adjustment frame 53. The side plate 54 has a vertical groove 541 with a lateral opening. The top edge of the side plate 54 is processed with an arc to achieve a smooth transition with the top plate 52 and prevent scratching the film. Electrodes are embedded in both the top plate 52 and the side plate 54. The electrodes are connected to an external electrostatic generator through a high-temperature resistant wire. After being energized, an electrostatic field is formed on the surface of the top plate 52 and the side plate 54. When the film bag enters the pretreatment channel, the electrostatic field adsorbs the insulating film to the plate surface and forces the film to be embedded in the corresponding groove. The horizontal groove 521 guides the top film to extend along the length of the keel and suppresses horizontal wrinkles. The vertical groove 541 guides the side film to extend downward and suppresses oblique slippage and wrinkles. This process allows the film to obtain a flat and oriented initial shape before it shrinks violently. In this embodiment, as Figures 4 to 7As shown, longitudinal beams 511 are symmetrically fixedly connected inside the mounting frame 51. A connecting rod 512 is fixedly connected to the top of the longitudinal beams 511. A cylinder 6 is fixedly connected to the top of the insulation box 204, and the telescopic end of the cylinder 6 is fixedly connected to the top of the connecting rod 512. Driven by the cylinder 6, the overall lifting and lowering adjustment of the top plate 52 can be realized to adapt to keels of different height specifications. Sliding rods 522 are symmetrically slidably connected inside the longitudinal beams 511. The sliding rods 522 are fixedly connected to the top of the top plate 52. The outer side of the sliding rods 522 is located between the top plate 52 and the longitudinal beams. A spring 523 is fitted between 511. This design allows the top plate 52 to have an elastic floating function. When it encounters a local protrusion (such as a cable tie), the top plate 52 can be lifted to compress the spring 523, while the rest remains in place, thereby achieving adaptive fine adjustment. Multiple constraint grooves are symmetrically opened inside the mounting bracket 51. Limiting pins are fixedly connected to the outside of the top plate 52, and the limiting pins slide inside the constraint grooves. This design allows the top plate 52 to float only in the vertical direction and also limits the range of its horizontal displacement, ensuring the stability of the operation. In this embodiment, as Figure 9 As shown, multiple elastic elements 55 are fixedly connected between the adjusting frame 53 and the side plate 54. The side plate 54 can rotate around its connection point with the adjusting frame 53. The elastic elements 55 provide the side plate 54 with an elastic preload towards the keel and allow it to swing outward when squeezed by the keel. Through this design, the working surface of the side plate 54 and the side of the keel can form a wedge-shaped space, which is narrow at the top and wide at the bottom, which helps to press the film more tightly against the side of the keel. Under the action of the elastic elements 55, when the bundle is not aligned or the keel shakes during operation, this design allows the upper edge to avoid the film, preventing it from getting stuck or torn.

[0021] In this embodiment, as Figure 5 As shown, the thermoplastic machine 2 is equipped with an adjustment assembly 7 for adjusting the spacing of the side plates 54. The adjustment assembly 7 includes a stepper motor 701, a synchronous belt assembly 702, and a bidirectional lead screw 703. The stepper motor 701 is fixed outside the insulation box 204, and its output shaft drives the bidirectional lead screw 703 to rotate through the synchronous belt assembly 702. The bidirectional lead screw 703 is threadedly connected to two adjustment frames 53. When the bidirectional lead screw 703 rotates, the two adjustment frames 53 drive the side plates 54 to make synchronous linear movements in opposite directions, thereby achieving precise adjustment of the spacing of the side plates 54 and enabling the film handling assembly 5 to quickly adapt to keel bundles of different widths.

[0022] Working principle of the invention: Bundles of keel are placed on the feeding conveyor belt 102 and transported to the film-wrapping station. The film-releasing mechanism 107 releases the pre-rolled shrink film. During this process, the needle wheel 108 punctures the surface of the film as it passes by, forming evenly distributed exhaust holes. After the film wraps the keel, the longitudinal sewing mechanism 105 heat-seals and cuts the overlapping sides of the film, sealing the film into a film bag that wraps the keel. While the longitudinal sewing mechanism 105 is working, the air blowing component blows a certain amount of air into the film bag to keep the film bag slightly bulging and full. The waste film edge material generated by the longitudinal sewing mechanism 105 is wound and collected by the receiving tray of the waste material collection mechanism 106. After the keel is wrapped, the transverse sealing mechanism 104 heat-seals and cuts the film at the rear end of the keel, completing the end sealing. The sealed, air-filled keel film bag is output by the feeding belt conveyor 103 and enters the oven 201 inlet of the thermoforming machine 2. It first enters the pre-treatment channel formed by the oven 201 and partition 4. An electrostatic generator supplies power to electrodes embedded in the top plate 52 and side plate 54, creating an electrostatic field on their surfaces. Under the action of the electrostatic field, the softened film is adsorbed onto the lower surface of the top plate 52 and the inner surface of the side plate 54. The film is forcibly embedded into the transverse groove 521 of the top plate 52 and the vertical groove 541 of the side plate 54. The transverse groove 521 guides the film on the top surface of the keel along the length of the keel. The film extends and flattens in the direction, and the vertical groove 541 guides the film on the side of the keel to extend and flatten downward in the vertical direction. The arc at the top of the side plate 54 ensures a smooth transition of the film from the top surface to the side. During this process, the top plate 52 can adapt to the local unevenness of the top surface of the keel through the floating mechanism composed of the slide rod 522 and the spring 523. The side plate 54 can adapt to the compression or sway of the side of the keel through the pre-tightening and rotatable design of the elastic element 55. Through the synergistic effect of electrostatic adsorption and groove guidance, the film is pre-organized into an initial shape that is flat and fits the surface of the keel before entering the high temperature shrinkage zone. The pre-treated keel film bag is then conveyed into the main heating zone of the oven 201. The arrayed heating tubes 203 generate heat, and the fan wheel 206 driven by the drive motor 205 forces the hot air to circulate, forming a heat field that blows evenly from top to bottom across the keel surface. The heat raises the temperature of the pre-attached film to its heat shrink point, and the film begins to shrink evenly, tightly wrapping the keel. Under the pressure of shrinkage, the air inside the film bag is discharged from the exhaust holes pre-pierced by the needle wheel 108. The keel that has completed heat shrink packaging is then conveyed by the conveying mechanism 202 and finally discharged from the outlet of the oven 201, falling onto the receiving roller conveyor 3. When it is necessary to package keels of different specifications (width or height), the stepper motor 701 is started to drive the synchronous belt group 702 to drive the bidirectional lead screw 703 to rotate, thereby driving the two adjustment frames 53 and the side plate 54 to move synchronously and adjust to the spacing suitable for the width of the new keel. By controlling the extension and retraction of the cylinder 6, the overall height of the top plate 52 is adjusted to adapt to the height of the keel.

[0023] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0024] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A keel thermoplastic packaging device, comprising a side sealing machine (1), a thermoplastic machine (2), and a receiving roller conveyor (3), wherein the thermoplastic machine (2) comprises an oven (201) and an insulated box (204) disposed on its outer side, the oven (201) is provided with a conveying mechanism (202) for conveying sealed workpieces, and heating pipes (203) are provided on both sides and the bottom of the inner wall of the oven (201), characterized in that, The oven (201) is symmetrically fixed with partitions (4), and the oven (201) and partitions (4) enclose a pretreatment channel, in which a film preparation assembly (5) is installed. The film preparation assembly (5) includes a mounting bracket (51) that slides up and down between two partitions (4) and a top plate (52) mounted on its bottom. The top plate (52) has a transverse groove (521) with a bottom opening. An adjustment bracket (53) is slidably connected to one side of the two partitions (4) that are close to each other, and a side plate (54) is rotatably connected to one side of the adjustment bracket (53) that is close to each other. The side plate (54) has a vertical groove (541) with a lateral opening, and an arc portion is provided at the top of the side plate (54). Electrodes are embedded in both the top plate (52) and the side plate (54). The electrodes are used to connect to an electrostatic generator to form an electrostatic field on the surface of the top plate (52) and the side plate (54), so that the packaging film entering the pretreatment channel is adsorbed and adhered to the workpiece surface along the guide of the transverse groove (521) and the vertical groove (541). The thermoplastic machine (2) is equipped with an adjustment component (7) for adjusting the spacing of the side plates (54).

2. The keel thermoplastic packaging device according to claim 1, characterized in that, The side sealing machine (1) includes a machine body (101) and a feeding belt conveyor (102) and a feeding belt conveyor (103) set on top of it. A horizontal sealing mechanism (104) is provided between the feeding belt conveyor (102) and the feeding belt conveyor (103) for sealing and cutting the film bag at the end of the workpiece.

3. The keel thermoplastic packaging device according to claim 2, characterized in that, A longitudinal sewing mechanism (105) is provided on the top of the machine body (101) and on one side of the feeding belt conveyor (103) for sealing the film bag on the side of the workpiece. A waste collection mechanism (106) is provided inside the machine body (101) for winding the waste film cut by the longitudinal sewing mechanism (105).

4. The keel thermoplastic packaging device according to claim 2, characterized in that, A film feeding mechanism (107) is provided on the top of the machine body (101) and on one side of the feeding belt conveyor (102). A needle wheel (108) is provided on one side of the film feeding mechanism (107). When feeding the film, the needle wheel (108) punctures the film bag to form an exhaust hole.

5. The keel thermoplastic packaging device according to claim 1, characterized in that, The top of the heat preservation box (204) is fixedly connected to multiple drive motors (205), and the output shaft of the drive motors (205) extends into the oven (201) and is fixedly connected to a fan wheel (206).

6. The keel thermoplastic packaging device according to claim 1, characterized in that, The mounting frame (51) is symmetrically fixedly connected with longitudinal beams (511), and a connecting rod (512) is fixedly connected to the top of the longitudinal beams (511). The top of the insulation box (204) is fixedly connected with a cylinder (6), and the telescopic end of the cylinder (6) is fixedly connected to the top of the connecting rod (512).

7. The keel thermoplastic packaging device according to claim 6, characterized in that, The longitudinal beam (511) is symmetrically slidably connected with a slide rod (522), the slide rod (522) is fixedly connected to the top of the top plate (52), and a spring (523) is sleeved on the outside of the slide rod (522) and between the top plate (52) and the longitudinal beam (511).

8. The keel thermoplastic packaging device according to claim 1 or 7, characterized in that, The mounting bracket (51) has multiple symmetrically arranged constraint grooves inside, and the outer side of the top plate (52) is fixedly connected with a limit pin, which slides inside the constraint groove.

9. The keel thermoplastic packaging device according to claim 1, characterized in that, The adjustment assembly (7) includes a stepper motor (701), a synchronous belt assembly (702), and a bidirectional lead screw (703); the stepper motor (701) is fixed outside the insulation box (204), and its output shaft drives the bidirectional lead screw (703) to rotate through the synchronous belt assembly (702). The bidirectional lead screw (703) is threadedly connected to two adjustment frames (53).

10. The keel thermoplastic packaging device according to claim 1, characterized in that, Multiple elastic elements (55) are fixedly connected between the adjustment frame (53) and the side plate (54). The side plate (54) can rotate around the connection point between it and the adjustment frame (53). The elastic elements (55) provide the side plate (54) with an elastic preload towards the workpiece and allow it to swing outward when squeezed by the workpiece.

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