Full-automatic thermal shrinkage packaging machine
By introducing a Y-axis cylinder-driven double-rod cutting structure and a gear rack and pinion tensioning structure into the heat shrink packaging machine, the heat shrink film is preheated, solving the problem of uneven shrinkage when the heat shrink film is not preheated, and improving the sealing performance and appearance quality of the packaging.
Patent Information
- Application Number
- CN202423196002.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-24
AI Technical Summary
In existing heat shrink packaging machines, the heat shrink film is directly introduced into the heating zone without preheating, resulting in uneven shrinkage of the film, wrinkles or damage, which affects the tightness and appearance of the packaging.
The double-rod cutting structure driven by a Y-axis cylinder is combined with a gear and rack pull structure. The gear and rack transmission structure is used to preheat the electric heating plate, ensuring that the heat shrink film is heated to a uniform temperature before cutting.
This effectively avoids uneven shrinkage caused by excessive temperature difference during the heating process of heat shrink film, ensuring a smooth film surface and improving the sealing effect and aesthetics of the packaging.
Smart Images
Figure CN223494945U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of packaging machine technology, specifically a fully automatic heat shrink packaging machine. Background Technology
[0002] Heat shrink packaging machines are widely used packaging equipment in industries such as food, pharmaceuticals, daily chemicals, and electronics. They primarily work by heating heat shrink film to tightly wrap products, achieving protection, sealing, aesthetic appeal, and ease of transport. They effectively prevent the impact of external environmental factors such as dust and moisture on products, while providing excellent sealing and extending shelf life. This is particularly important in the food industry. The structure of a heat shrink packaging machine typically consists of a packaging film feeding system, a conveyor belt system, a heating system, a shrink zone (heat shrink oven), a cooling system, a film cutting system, and a control system. Its working principle can be divided into several steps. First, the product is placed on a conveyor belt, then the packaging film wraps around the product, and it enters the heating zone where it is heated and shrunk by hot air or electric heating tape. Next, the film is quickly cooled and shaped. Finally, the excess packaging film is removed by the film cutting system. During the above process, the packaging film placed on the product needs to be cut by the cutting device. After the conveyor belt system sends the next product to the packaging film feeding system, the packaging film feeding system continues to put the heat shrink film onto the product, and the subsequent heating equipment shrinks the heat shrink film and the product. In this process, the heat shrink film that has just been cut is sent into the heating equipment without preheating. Because the physical properties and structure of the heat shrink film are in a relatively "rigid" state when not preheated, when the film directly enters the heating zone, the temperature conduction difference between the film surface and the interior is large, resulting in uneven shrinkage. On the one hand, some parts of the film may shrink excessively due to overheating, resulting in irregular wrinkles or damage; on the other hand, some areas may not shrink completely due to insufficient heating, thus affecting the tightness and aesthetics of the packaging. Utility Model Content
[0003] The purpose of this invention is to provide a fully automatic heat shrink packaging machine. A Y-axis cylinder drives a double-rod cutting structure to cut the heat shrink film fed by the packaging film feeding system. While the double-rod cutting structure is in operation, the linear pushing motion of the Y-axis cylinder is transmitted to the gear and rack pull structure through a gear and rack transmission structure. The gear and rack pull structure brings the two electric heating plates closer together and preheats the product covered with heat shrink film, thereby solving the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a fully automatic heat shrink packaging machine, comprising a U-shaped upright frame and a double-rod cutting structure mounted on one side of the U-shaped upright frame. A Y-axis cylinder for driving the double-rod cutting structure is mounted at the top of the U-shaped upright frame. A support plate is mounted on the surface of the U-shaped upright frame below the double-rod cutting structure, and electric heating plates are slidably mounted on both sides of the bottom end of the support plate. A gear and rack counter-pull structure for driving the two electric heating plates to move in opposite directions is mounted at the bottom end of the support plate. A gear and rack transmission structure for maintaining power transmission is provided between the gear and rack counter-pull structure and the double-rod cutting structure.
[0005] Preferably, the double-bar cutting structure includes guide columns slidably mounted on both sides of the U-shaped support surface, and a rear crossbeam and a front beam respectively fixed at both ends of the two guide columns. The double-bar cutting structure also includes a knife holder fixed on one side of the U-shaped support surface, and a cutting knife is fixed on the outer wall of the front beam near the knife holder.
[0006] Preferably, the end of the guide column on one side of the front beam is provided with an elastic retraction structure.
[0007] Preferably, the elastic retraction structure includes a baffle fixed to one end of the guide post surface and a helical spring fixed to the outer wall of one side of the baffle. The helical spring is coaxial with the guide post, and one end of the helical spring is fixedly connected to the outer wall of one side of the front beam.
[0008] Preferably, the gear and rack linkage structure includes a rotating shaft rotatably mounted on the top of the support plate, right-angle connecting arms that are mirror-symmetrical and slidably mounted on both sides of the bottom of the support plate, and secondary X-axis racks mounted on the opposite outer walls of the two right-angle connecting arms. One end of the rotating shaft surface is fixed with a second gear for meshing with the two secondary X-axis racks. One outer wall of the electric heating plate is fixedly connected to one outer wall of the right-angle connecting arm. The rotating shaft is connected to one outer wall of the rear crossbeam through the gear and rack transmission structure.
[0009] Preferably, the gear and rack transmission structure includes a drive gear fixed on the outer wall of one side of the rear crossbeam and a first-stage Y-axis rack fixed on the top of the rotating shaft, wherein the first-stage Y-axis rack and the drive gear mesh with each other.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This fully automatic heat shrink packaging machine, with the cooperation of a double-rod cutting structure driven by a Y-axis cylinder and a gear rack and pinion structure, realizes different actions of the two electric heating plates in the cutting and non-cutting states. The linkage between the double-rod cutting structure driven by the Y-axis cylinder and the gear rack and pinion structure, when the double-rod cutting structure is cutting the film, allows the electric heating plates to approach and preheat the product covered with heat shrink film. This effectively makes the surface and internal temperature of the film more uniform, avoiding the problem of uneven heat shrinkage caused by excessive temperature difference when directly entering the heating area. This avoids the phenomenon of wrinkles, creases, or unshrinked areas on the film surface, ensuring that the packaging film perfectly wraps the product surface and has a better sealing effect. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the main structure of this utility model;
[0012] Figure 2 This is a side view of the structure of this utility model;
[0013] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;
[0014] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;
[0015] Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 .
[0016] In the diagram: 1. U-shaped support frame; 2. Guide column; 3. Rear crossbeam; 4. Y-axis cylinder; 5. Front beam; 6. Tool holder; 7. Cutting blade; 8. Support plate; 9. Elastic retraction structure; 10. Gear and rack pull structure; 1001. Rotating shaft; 10011. Second gear; 1002. Right-angle connecting arm; 1003. Secondary X-axis rack; 11. Electric heating plate; 12. Gear and rack transmission structure; 1201. Drive gear; 1202. Primary Y-axis rack. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0018] Please see Figure 1-5An embodiment of this utility model provides: a fully automatic heat shrink packaging machine, including a U-shaped upright frame 1 and a double-rod cutting structure installed on one side of the surface of the U-shaped upright frame 1. A Y-axis cylinder 4 for driving the action of the double-rod cutting structure is installed at the top of the U-shaped upright frame 1. A support plate 8 is installed on the surface of the U-shaped upright frame 1 below the double-rod cutting structure. Electric heating plates 11 are slidably installed on both sides of the bottom end of the support plate 8. A gear rack and pinion pull structure 10 for driving the two electric heating plates 11 to move in opposite directions is installed at the bottom end of the support plate 8. A gear rack and pinion transmission structure 12 for maintaining power transmission is provided between the gear rack and pinion pull structure 10 and the double-rod cutting structure.
[0019] The double-bar cutting structure includes guide posts 2 that are slidably installed on both sides of the surface of the U-shaped support 1, and a rear crossbeam 3 and a front beam 5 that are fixed at both ends of the two guide posts 2 respectively. The double-bar cutting structure also includes a knife holder 6 fixed on one side of the surface of the U-shaped support 1. A cutting knife 7 is fixed on the outer wall of the front beam 5 near the knife holder 6. The piston rod of the Y-axis cylinder 4 pushes the rear crossbeam 3, guide posts 2, and front beam 5 to move backward, that is, the cutting knife 7 moves towards the knife holder 6 until the cutting knife 7 is embedded in the interior of the knife holder 6 and completes the cutting action on the heat shrink film. This cutting method can improve the cutting accuracy and ensure that the film material is not wasted due to improper cutting.
[0020] An elastic retraction structure 9 is provided at the end of the guide post 2 on one side of the front beam 5. The elastic retraction structure 9 includes a baffle fixed to one end of the surface of the guide post 2 and a helical spring fixed on the outer wall of one side of the baffle. The helical spring is coaxial with the guide post 2, and one end of the helical spring is fixedly connected to the outer wall of one side of the front beam 5. The setting of the elastic retraction structure 9 can prevent the cutting blade 7 from bending due to excessive extension of the Y-axis cylinder 4 after the cutting blade 7 enters the cutting blade holder 6.
[0021] The gear and rack linkage structure 10 includes a rotating shaft 1001 rotatably mounted on the top of the support plate 8, right-angle connecting arms 1002 mirror-symmetrically mounted and slidably mounted on both sides of the bottom of the support plate 8, and secondary X-axis racks 1003 mounted on the opposite outer walls of the two right-angle connecting arms 1002. One end of the surface of the rotating shaft 1001 is fixed with a second gear 10011 for meshing with the two secondary X-axis racks 1003. One side of the outer wall of the electric heating plate 11 is fixedly connected to one side of the outer wall of the right-angle connecting arm 1002. The rotating shaft 1001 is connected to one side of the outer wall of the rear crossbeam 3 through the gear and rack transmission structure 12. The gear and rack transmission structure 12 includes a drive gear 1201 fixed on one side of the outer wall of the rear crossbeam 3 and a first-stage Y-axis rack 1202 fixed on the top of the rotating shaft 1001. The first-stage Y-axis rack 1202 and the drive gear 1201 mesh with each other.
[0022] During the film cutting process of the cutter holder 6 and the cutter 7, the rear crossbeam 3 drives the rotating shaft 1001 in the gear rack tension structure 10 to rotate through the drive gear 1201 and the first-stage Y-axis rack 1202. Since the second gear 10011 meshes with two mirror-symmetrical second-stage X-axis racks 1003, the two right-angle connecting arms 1002 and the electric heating plate 11 move towards each other, that is, the two electric heating plates 11 can approach each other, allowing the two electric heating plates 11 to approach the film for preheating, thereby effectively utilizing the idle time in the cutting production cycle. After the cutting is completed, the preheating effect of the heat shrink film makes the film material have good shrinkage and flexibility, and can tightly wrap the product surface under the action of subsequent heating equipment.
[0023] In this embodiment, the operator first places the structure below the packaging film feeding system of the heat shrink packaging machine. The conveyor belt system for transporting products through the U-shaped support frame 1 extends out. When the conveyor belt system transports the product to the area below the packaging film feeding system, the packaging film feeding system feeds the heat shrink film onto the product and sets it in place. At this time, the control unit of the heat shrink packaging machine drives the Y-axis cylinder 4 to extend and retract once. During the extension phase of the Y-axis cylinder 4, the piston rod of the Y-axis cylinder 4 pushes the double-rod cutting structure to cut the heat shrink film. During this process, the linear motion of the Y-axis cylinder 4 is converted into the opposing motion of the two electric heating plates 11 on the X-axis through the gear and rack transmission structure 12 and the gear and rack pull structure 10. The plates 11 move closer to each other, meaning the two electric heating plates 11 move closer to each other during the film cutting process, ensuring that the film can be heated evenly during the subsequent heat shrinking process. In this state, the electric heating plates 11 begin to transfer heat to the film, preheating the heat shrink film to improve the film's flexibility, reduce the risk of uneven shrinkage, and lay the foundation for the subsequent heating and shrinking process. During the shrinking stage of the Y-axis cylinder 4, the double-rod cutting structure ends the cutting action, and the two electric heating plates 11 begin to move away under the drive of the gear and rack pull structure 10 and the gear and rack transmission structure 12, in order to avoid the electric heating plates 11 preheating time being too long and causing the heat shrink film to shrink prematurely. After the film feeding system places the heat shrink film onto the next product, the structure repeats the above steps to continuously perform the cutting and preheating work of the packaging film.
Claims
1. A fully automatic heat shrink packaging machine, characterized in that: The device includes a U-shaped support frame (1) and a double-rod cutting structure mounted on one side of the surface of the U-shaped support frame (1). A Y-axis cylinder (4) for driving the double-rod cutting structure is mounted on the top of the U-shaped support frame (1). A support plate (8) is mounted on the surface of the U-shaped support frame (1) below the double-rod cutting structure. Electric heating plates (11) are slidably mounted on both sides of the bottom end of the support plate (8). A gear and rack counter-rotating structure (10) for driving the two electric heating plates (11) to move in opposite directions is mounted on the bottom end of the support plate (8). A gear and rack transmission structure (12) for maintaining power transmission is provided between the gear and rack counter-rotating structure (10) and the double-rod cutting structure.
2. The fully automatic heat shrink packaging machine according to claim 1, characterized in that: The double-bar cutting structure includes guide posts (2) that are slidably installed on both sides of the surface of the U-shaped frame (1), and a rear crossbeam (3) and a front beam (5) that are respectively fixed at both ends of the two guide posts (2). The double-bar cutting structure also includes a knife holder (6) fixed on one side of the surface of the U-shaped frame (1). A cutting knife (7) is fixed on the outer wall of the front beam (5) near the knife holder (6).
3. The fully automatic heat shrink packaging machine according to claim 2, characterized in that: An elastic retraction structure (9) is provided at the end of the guide column (2) on one side of the front beam (5).
4. The fully automatic heat shrink packaging machine according to claim 3, characterized in that: The elastic retraction structure (9) includes a baffle fixed to one end of the surface of the guide post (2) and a helical spring fixed on the outer wall of one side of the baffle. The helical spring is coaxial with the guide post (2), and one end of the helical spring is fixedly connected to the outer wall of one side of the front beam (5).
5. The fully automatic heat shrink packaging machine according to claim 2, characterized in that: The gear and rack pull structure (10) includes a rotating shaft (1001) rotatably mounted on the top of the support plate (8), right-angle connecting arms (1002) mirror-symmetrically mounted on both sides of the bottom of the support plate (8) and two secondary X-axis racks (1003) mounted on the opposite outer walls of the two right-angle connecting arms (1002). One end of the surface of the rotating shaft (1001) is fixed with a second gear (10011) for meshing with the two secondary X-axis racks (1003). One side of the outer wall of the electric heating plate (11) is fixedly connected to one side of the outer wall of the right-angle connecting arm (1002). The rotating shaft (1001) is connected to one side of the outer wall of the rear crossbeam (3) through the gear and rack transmission structure (12).
6. The fully automatic heat shrink packaging machine according to claim 5, characterized in that: The gear and rack transmission structure (12) includes a drive gear (1201) fixed on the outer wall of one side of the rear crossbeam (3) and a first-stage Y-axis rack (1202) fixed on the top of the rotating shaft (1001). The first-stage Y-axis rack (1202) and the drive gear (1201) mesh with each other.