A heat sealer for packaging bags

Abstract

The utility model discloses a kind of heat sealers for packaging bag, including base, the upper end of the base is fixedly connected with bottom plate, the upper end of the bottom plate is fixedly connected with two symmetrical vertical rods, the upper end of two vertical rods is fixedly connected with top plate in common, sleeve pipe is slidably sleeved on two vertical rods, mobile plate is fixedly sleeved in common between two sleeve pipes, the upper end of the bottom plate is provided with lower hot-pressing plate, the lower end of the mobile plate is provided with upper hot-pressing plate matched with lower hot-pressing plate, the lower end of the top plate is provided with moving mechanism for moving mobile plate. The utility model structure is reasonable, through the lifting action of mobile plate, the process of "heat seal-pumping-air-cooling" is realized synchronously, sealing jet air current cooling is not needed additional power source, action synchronism is strong, production cycle is greatly shortened.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and in particular to a heat sealing machine for packaging bags. Background Technology

[0002] A heat sealing machine is a core piece of equipment in the packaging bag processing process. It uses a heated pressure plate to heat-seal the opening of the packaging bag, thus achieving the packaging function.

[0003] Existing heat sealing machines often have the following problems when in use: After heat sealing, the temperature at the sealing point of the packaging bag is high. If it is directly handled or stacked, problems such as sealing deformation and adhesion may occur, affecting the packaging quality. To avoid such problems, it is usually necessary to wait for the sealing to cool down naturally, which reduces production efficiency and cannot meet the needs of large-scale continuous production. While some improved heat-sealing machines attempt to add cooling mechanisms, such as independent fans or cold air ducts, these mechanisms require additional power sources (such as motors and air pumps). This not only increases equipment manufacturing costs and energy consumption but also results in concentrated cooling areas and asynchronous cooling with the heat-sealing action, making it difficult to achieve precise and rapid cooling of the sealing area and effectively balance production efficiency and packaging quality. Therefore, there is an urgent need for a sealing and cooling structure that can be linked to the heat-sealing action without requiring an additional power source, in order to improve the practicality and production adaptability of heat-sealing machines. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a heat-sealing machine for packaging bags.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A heat-sealing machine for packaging bags includes a base, a bottom plate fixedly connected to the upper end of the base, two symmetrically arranged vertical rods fixedly connected to the upper end of the bottom plate, a top plate fixedly connected to the upper end of the two vertical rods, sleeves slidably fitted onto each of the two vertical rods, a movable plate fixedly fitted between the two sleeves, a lower heat-pressing plate provided at the upper end of the bottom plate, an upper heat-pressing plate cooperating with the lower heat-pressing plate provided at the lower end of the top plate, a moving mechanism for moving the movable plate provided at the lower end of the top plate, a vertical plate fixedly connected to the upper end of the base, a plurality of equally spaced exhaust nozzles fixedly connected to the vertical plate, the plurality of exhaust nozzles cooperating with the lower heat-pressing plate, a pumping mechanism for pumping air onto the plurality of exhaust nozzles provided at the lower end of the top plate, the pumping mechanism including a plurality of equally spaced fixed pipes fixedly connected to the lower end of the top plate, the upper ends of the plurality of fixed pipes being connected to the plurality of exhaust nozzles through a plurality of one-way air outlet pipes.

[0006] Preferably, the moving mechanism includes two symmetrically arranged electric push rods fixedly connected to the lower end of the top plate, and the telescopic ends of the two electric push rods are fixedly connected to the upper end of the moving plate.

[0007] Preferably, each of the plurality of fixed tubes has a piston slidably connected inside, the lower ends of each of the plurality of pistons are fixedly connected to a fixed rod, and the lower ends of each of the plurality of fixed rods are fixedly connected to the upper end of the movable plate.

[0008] Preferably, the upper ends of both sleeves are elastically connected to the top plate by springs.

[0009] Preferably, a one-way air inlet pipe is provided on the side wall of each of the plurality of fixed pipes and communicates with it.

[0010] Compared with the prior art, the advantages of this utility model are as follows: 1. The "heat sealing-air extraction-cooling" process is realized simultaneously through the lifting and lowering of the moving plate. When the moving plate moves down, it drives the upper hot plate to fit with the lower hot plate to complete the heat sealing. At the same time, the piston is pulled down by the fixed rod to draw external air into the fixed pipe. After the heat sealing is completed, the moving plate returns to its original position, drives the piston to move up to force the air in the fixed pipe out, and delivers it to the exhaust nozzle through the one-way exhaust pipe to cool the airflow sprayed at the sealing point. No additional power source is required, the action is highly synchronized, and the production cycle is greatly shortened.

[0011] 2. The air pumping mechanism is linked with the moving plate and electric push rod, eliminating the need for additional power components such as air pumps and fans, simplifying the equipment structure and reducing manufacturing costs and energy consumption; the spring 8 not only assists in resetting but also buffers the impact of the moving plate's movement, extending the equipment's service life. Attached Figure Description

[0012] Figure 1 This is a perspective view of a heat sealing machine for packaging bags proposed in this utility model; Figure 2 This is a front view of a heat sealing machine for packaging bags proposed in this utility model; Figure 3 This is a rear perspective view of a heat sealing machine for packaging bags proposed in this utility model. Figure 4 This is a cross-sectional side view of a heat sealing machine for packaging bags proposed in this utility model; Figure 5 for Figure 4 Enlarged view of the structure at point A in the image.

[0013] In the diagram: 1. Base, 2. Base plate, 3. Top plate, 4. Moving plate, 5. Vertical rod, 6. Vertical plate, 7. One-way exhaust pipe, 8. Spring, 9. Sleeve, 10. Electric push rod, 11. Fixed pipe, 12. One-way intake pipe, 13. Upper hot press plate, 14. Lower hot press plate, 15. Exhaust nozzle, 16. Piston, 17. Fixed rod. Detailed Implementation

[0014] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0015] Reference Figure 1-5 A heat-sealing machine for packaging bags includes a base 1, which provides support for the entire machine. A base plate 2 is fixedly connected to the upper end of the base 1. Two symmetrically arranged vertical rods 5 are fixedly connected to the upper end of the base plate 2 by welding or bolts. A top plate 3 is fixedly connected to the upper end of the two vertical rods 5, forming a stable frame. Sleeves 9 are slidably sleeved on both vertical rods 5. The sleeves 9 can slide freely along the axial direction of the vertical rods 5. A movable plate 4 is fixedly sleeved between the two sleeves 9, so that the movable plate 4 rises and falls synchronously with the sleeves 9. A lower heat-pressing plate 14 is detachably connected to the upper end of the base plate 2 by bolts. An upper heat-pressing plate 13 is correspondingly provided at the lower end of the movable plate 4 to cooperate with the lower heat-pressing plate 14. Both the upper heat-pressing plate 13 and the lower heat-pressing plate 14 adopt an electric heating structure, and the heating temperature can be adjusted according to the material of the packaging bag to achieve heat-press sealing of the opening of the packaging bag. The lower end of the top plate 3 is provided with a moving mechanism for driving the moving plate 4 to rise and fall. The moving mechanism includes two symmetrically arranged electric push rods 10 fixedly connected to the lower end of the top plate 3. The telescopic ends of the two electric push rods 10 are fixedly connected to the upper end of the moving plate 4 by bolts. Through the telescopic movement of the electric push rods 10, the moving plate 4 is driven to rise and fall stably along the vertical rod 5, thereby controlling the opening and closing of the upper hot press plate 13 and the lower hot press plate 14. A vertical plate 6 is fixedly connected to the upper end of the base 1 near the lower hot press plate 14. A plurality of equally spaced exhaust nozzles 15 are fixedly connected to the side of the vertical plate 6 facing the heat sealing area. The exhaust nozzles 15 are directed to the sealing area after the upper hot press plate 13 and the lower hot press plate 14 are joined, and are used to spray airflow into the sealing area to achieve heat dissipation and cooling. A pumping mechanism is provided at the lower end of the top plate 3 to provide air source for the exhaust nozzles 15. The pumping mechanism includes a plurality of equally spaced fixed pipes 11 fixedly connected to the lower end of the top plate 3. The number of fixed pipes 11 corresponds one-to-one with the exhaust nozzles 15. The upper ends of the plurality of fixed pipes 11 are connected to the plurality of exhaust nozzles 15 through a plurality of one-way exhaust pipes 7. The one-way exhaust pipes 7 are equipped with one-way valves, which only allow gas to flow from the fixed pipes 11 to the exhaust nozzles 15 to prevent airflow backflow. Pistons 16 are slidably connected inside multiple fixed tubes 11. The pistons 16 and the inner wall of the fixed tubes 11 are sealed together (e.g., with sealing rings) to ensure gas tightness. Fixed rods 17 are fixedly connected to the lower ends of multiple pistons 16. The lower ends of multiple fixed rods 17 are fixedly connected to the upper ends of the moving plate 4, so that the pistons 16 can slide synchronously inside the fixed tubes 11 when the moving plate 4 rises and falls. The upper ends of the two sleeves 9 are elastically connected to the top plate 3 by springs 8. The springs 8 are sleeved on the outside of the vertical rod 5, and their two ends abut against the upper end of the sleeves 9 and the lower end of the top plate 3, respectively, to assist the moving plate 4 in resetting and to buffer the impact force when the moving plate 4 descends. One-way air inlet pipes 12 are provided on the side walls of multiple fixed tubes 11 and communicate with their interiors. One-way air inlet pipes 12 are equipped with one-way valves inside, allowing only external air to enter the fixed tubes 11 and preventing gas leakage from the fixed tubes 11 through the one-way air inlet pipes 12.

[0016] In use, the packaging bag to be heat-sealed is placed on the lower heat-pressing plate 14 with its opening facing upwards. The position of the packaging bag is adjusted so that the edge of the opening is aligned with the heat-sealing area of ​​the lower heat-pressing plate 14. The heating temperature of the upper heat-pressing plate 13 and the lower heat-pressing plate 14 is set by the external controller and the equipment is started for preheating. After preheating, the extension end of the electric push rod 10 is extended, pushing the moving plate 4 to slide downwards along the vertical rod 5. At this time, the sleeve 9 moves downwards synchronously, and the spring 8 is compressed to generate elastic potential energy. During the downward movement of the moving plate 4, the upper heat-pressing plate 13 is gradually moved closer to the lower heat-pressing plate 14. At the same time, the piston 16 is pulled downwards in the fixed tube 11 by the fixed rod 17. The volume inside the fixed tube 11 increases, forming a negative pressure. External air enters the fixed tube 11 through the one-way air inlet pipe 12 (one-way valve is open), completing the air extraction. When the moving plate 4 descends to the limit position, the upper heat-pressing plate 13 and the lower heat-pressing plate 14 are completely in contact, and the opening of the packaging bag is heat-sealed.

[0017] After heat sealing is completed, the telescopic end of the control electric push rod 10 retracts, and the moving plate 4 returns to its original position under the pull of the electric push rod 10 and the elastic restoring force of the spring 8. During the resetting process of the moving plate 4, the piston 16 is pushed to slide upward in the fixed tube 11 by the fixed rod 17, the volume inside the fixed tube 11 decreases, and the air is compressed. At this time, the one-way valve of the one-way air inlet pipe 12 is closed, and the air can only be delivered to the exhaust nozzle 15 through the one-way air outlet pipe 7 (one-way valve is open). The exhaust nozzle 15 sprays airflow into the sealing area that has just been heat sealed, quickly taking away the heat at the sealing point, so that the sealing temperature drops below room temperature within 5-10 seconds. When the moving plate 4 rises to the initial position, the piston 16 returns to the top of the fixed tube 11, and the pumping action stops.

[0018] After the seal has completely cooled, the heat-sealed packaging bag is removed from the lower hot plate 14 by manual labor or a robotic arm, completing one heat-sealing operation; then the next packaging bag can be heat-sealed, realizing continuous production. This invention cleverly combines heat sealing and cooling actions through the linkage design of the moving plate and the air pump mechanism. It can achieve rapid cooling of the sealing without the need for an additional power source, effectively solving the problems of low production efficiency and poor sealing quality of existing heat sealing machines. It is suitable for the mass production of various plastic and composite film packaging bags in the food, daily chemical, and pharmaceutical industries.

[0019] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A heat sealing machine for packaging bags, comprising a base (1), characterized in that, The upper end of the base (1) is fixedly connected to a base plate (2). The upper end of the base plate (2) is fixedly connected to two symmetrically arranged vertical rods (5). The upper ends of the two vertical rods (5) are jointly fixedly connected to a top plate (3). Each of the two vertical rods (5) is slidably fitted with a sleeve (9). A movable plate (4) is fixedly fitted between the two sleeves (9). The upper end of the base plate (2) is provided with a lower hot press plate (14). The lower end of the movable plate (4) is provided with an upper hot press plate (13) that cooperates with the lower hot press plate (14). The lower end of the top plate (3) is provided with a tool for pressing the movable plate (4). The moving mechanism is a base (1) with a vertical plate (6) fixedly connected to the upper end. Multiple exhaust nozzles (15) are fixedly connected to the vertical plate (6) at equal intervals. The multiple exhaust nozzles (15) cooperate with the lower hot press plate (14). The lower end of the top plate (3) is provided with a pumping mechanism for pumping air to the multiple exhaust nozzles (15). The pumping mechanism includes multiple fixed pipes (11) fixedly connected to the lower end of the top plate (3) at equal intervals. The upper ends of the multiple fixed pipes (11) are connected to the multiple exhaust nozzles (15) through multiple one-way air outlet pipes (7).

2. The heat-sealing machine for packaging bags according to claim 1, characterized in that, The moving mechanism includes two symmetrically arranged electric push rods (10) fixedly connected to the lower end of the top plate (3), and the telescopic ends of the two electric push rods (10) are fixedly connected to the upper end of the moving plate (4).

3. A heat-sealing machine for packaging bags according to claim 2, characterized in that, Each of the multiple fixed tubes (11) has a piston (16) slidably connected inside, and each of the multiple pistons (16) has a fixed rod (17) fixedly connected to its lower end. The lower ends of each of the multiple fixed rods (17) are fixedly connected to the upper end of the movable plate (4).

4. A heat-sealing machine for packaging bags according to claim 3, characterized in that, The upper ends of the two sleeves (9) are elastically connected to the top plate (3) by springs (8).

5. A heat-sealing machine for packaging bags according to claim 4, characterized in that, Each of the fixed tubes (11) has a one-way air inlet tube (12) connected to its side wall.

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