A sealing device for packaging bag production

Abstract

The utility model discloses a sealing device for packaging bag production relates to packaging bag sealing technical field, including processing platform, the upper fixed mounting of processing platform one end has the mounting bracket, the inboard mounting of mounting bracket has upper heat seal cutter, the upper fixed mounting of mounting bracket has first electric telescopic cylinder, the inside of processing platform one end is provided with telescopic cavity, the inside movable mounting of telescopic cavity has lower heat seal cutter, one side fixed mounting of upper heat seal cutter has the connecting block, the below of one side of upper heat seal cutter is installed rubber strip, the top of rubber strip both ends is all fixed mounting with a connecting rod, the outside sliding installation of connecting rod has compression spring, this sealing device installs the compression structure on one side of upper heat seal cutter, and the one side of packaging bag sealing part is pressed tightly fixed before heat sealing, and in this way, when heat seal cutter and packaging bag contact, will not cause packaging bag to deviate, improves the bag mouth sealing quality of packaging bag.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag sealing technology, specifically a sealing device for packaging bag production. Background Technology

[0002] Packaging bags are bags used to package various goods, facilitating transportation and storage during production and distribution. They are widely used in daily life and industrial production. The production process of packaging bags requires heat sealing any excess openings to create containers with only one opening. Sealing the packaging bag is a crucial step in ensuring product airtightness, extending shelf life, and preventing contamination. The process selection must comprehensively consider factors such as material properties, packaging contents, production efficiency, and cost. This involves heating to melt the plastic film, which then cools to form a sealed bond.

[0003] Chinese Patent Publication No. CN222905047U, authorized on May 27, 2025, discloses a sealing device for packaging bag production. The device includes a frame, with a horizontal frame fixedly installed inside. An upper movable plate and a lower movable plate are symmetrically arranged within the frame, with the top surface of the horizontal frame as a reference. Two electric heating strips are fixedly connected to the bottom of the upper movable plate and the top of the lower movable plate. Installation grooves are provided on the inner walls of both sides of the frame. In use, after moving the sealed portion of the semi-finished plastic bag above the horizontal frame, a cylinder is activated to push the upper movable plate downwards, which in turn moves the lower movable plate upwards. This causes the electric heating strips on the upper and lower movable plates to clamp the upper and lower sides of the semi-finished plastic bag, simultaneously heating both sides to ensure reliable sealing. Afterwards, the cylinder pushes the movable plate further downwards, causing a cutter to move downwards to cut the plastic bag at the heat-sealed area, separating adjacent plastic bags for greater convenience.

[0004] Existing sealing devices lack effective limiting when sealing packaging bags. When the heat sealing knife comes into contact with the packaging bag, the packaging bag may shift, resulting in the bag opening not being completely sealed. This reduces the sealing quality of the packaging bag and fails to meet usage requirements. Utility Model Content

[0005] The purpose of this utility model is to provide a sealing device for packaging bag production, so as to solve the problem mentioned in the background art that the existing sealing device does not have an effective limit when sealing the packaging bag, and the packaging bag may be deviated when the heat sealing knife comes into contact with the heat sealing knife of the packaging bag, resulting in the bag opening not being completely sealed, reducing the sealing quality of the packaging bag opening and failing to meet the usage requirements.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sealing device for packaging bag production, comprising a processing table, an mounting frame fixedly installed above one end of the processing table in an L-shape, an upper heat sealing knife installed inside the mounting frame, a first electric telescopic cylinder fixedly installed above the mounting frame, the telescopic end of the first electric telescopic cylinder connected to the upper end of the upper heat sealing knife, a telescopic cavity provided inside one end of the processing table, a lower heat sealing knife movably installed inside the telescopic cavity, a second electric telescopic cylinder fixedly installed below the processing table, the telescopic end of the second electric telescopic cylinder connected to the lower end of the lower heat sealing knife, a connecting block fixedly installed on one side of the upper heat sealing knife, two connecting blocks provided, the two connecting blocks being located on one side of both ends of the upper heat sealing knife, a rubber strip installed below one side of the upper heat sealing knife, a connecting rod fixedly installed above each end of the rubber strip, the connecting rods being slidably connected to the connecting blocks, a compression spring slidably installed outside the connecting rods, the two ends of the compression springs contacting the connecting blocks and the rubber strips respectively.

[0007] Preferably, both the mounting bracket and the inner wall of the telescopic cavity are provided with sliding grooves, and a slider is fixedly installed at one end of the upper heat sealing knife and both ends of the lower heat sealing knife. One end of the slider extends into the interior of the sliding groove, and the slider is slidably connected to the mounting bracket.

[0008] Preferably, a feeding roller is rotatably mounted on the inner side of the processing table. There are two feeding rollers, and a conveyor belt is installed between the two feeding rollers. The conveyor belt is connected to the feeding rollers in a driving connection. A motor is fixedly installed on one side of one end of the processing table, and the output end of the motor is connected to one end of the feeding roller.

[0009] Preferably, a vibration damping support leg is fixedly installed under the processing table, and four vibration damping support legs are provided, with the four vibration damping support legs located at the four corners of the processing table.

[0010] Preferably, a push plate is installed above the conveyor belt and is in contact with the conveyor belt. A third electric telescopic cylinder is installed on one side of the push plate and is connected to the processing table by screws. The telescopic end of the third electric telescopic cylinder is connected to the back of the push plate.

[0011] Preferably, a guide plate is fixedly installed on one side of the processing table, and the upper end of the guide plate is flush with the upper end of the conveyor belt, and the guide plate is inclined.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model device, through the arrangement of a first electric telescopic cylinder, an upper heat sealing knife, a rubber strip, and a compression spring, uses the first electric telescopic cylinder to drive the upper heat sealing knife to rise and fall. When the upper heat sealing knife descends, it causes the rubber strip to fall. The rubber strip first contacts the packaging bag, and the compression spring applies a pushing force to the rubber strip, making the rubber strip in close contact with the packaging bag. This pre-presses and fixes the packaging bag to be sealed. The lower the upper heat sealing knife falls, the greater the pushing force applied by the compression spring, and the more firmly the packaging bag is pressed. When the heat sealing knife contacts the packaging bag, it will not cause the packaging bag to shift, thus improving the sealing quality of the packaging bag opening. This utility model device uses a guide plate, a push plate, and a third electric telescopic cylinder. The third electric telescopic cylinder drives the push plate to extend and retract. The moving push plate contacts the sealed packaging bag on the conveyor belt and applies a pushing force, pushing the packaging bag from the conveyor belt onto the guide plate. The packaging bag then falls down along the guide plate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 For the present utility model Figure 1 A magnified view of a portion of area A; Figure 3 This diagram shows the connection relationship between the upper and lower heat sealing blades of this utility model and the processing table. Figure 4 This is a diagram showing the connection relationship between the rubber strip and the upper heat sealing knife in this utility model; Figure 5 This is a diagram showing the connection between the conveyor belt and the processing table in this utility model.

[0014] In the diagram: 1. Processing table; 2. Vibration damping support leg; 3. Motor; 4. Conveyor belt; 5. Guide plate; 6. Mounting frame; 7. Push plate; 8. First electric telescopic cylinder; 9. Upper heat sealing knife; 10. Second electric telescopic cylinder; 11. Telescopic cavity; 12. Lower heat sealing knife; 13. Third electric telescopic cylinder; 14. Slide groove; 15. Sliding block; 16. Connecting block; 17. Connecting rod; 18. Rubber strip; 19. Compression spring; 20. Feeding roller. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Please see Figure 1-5This utility model provides an embodiment of a sealing device for packaging bag production, comprising a processing table 1, an mounting frame 6 fixedly installed above one end of the processing table 1, the mounting frame 6 being L-shaped, an upper heat sealing knife 9 installed inside the mounting frame 6, a first electric telescopic cylinder 8 fixedly installed above the mounting frame 6, the telescopic end of the first electric telescopic cylinder 8 being connected to the upper end of the upper heat sealing knife 9, a telescopic cavity 11 provided inside one end of the processing table 1, a lower heat sealing knife 12 movably installed inside the telescopic cavity 11, a second electric telescopic cylinder 10 fixedly installed below the processing table 1, the telescopic end of the second electric telescopic cylinder 10 being connected to the lower end of the lower heat sealing knife 12, a connecting block 16 fixedly installed on one side of the upper heat sealing knife 9, two connecting blocks 16 being provided, and the two connecting blocks 16 being located on one side of both ends of the upper heat sealing knife 9, a rubber strip 18 installed below one side of the upper heat sealing knife 9, and a connecting rod 1 fixedly installed above each end of the rubber strip 18. 7. The connecting rod 17 and the connecting block 16 are slidably connected. A compression spring 19 is slidably installed on the outside of the connecting rod 17. The two ends of the compression spring 19 are in contact with the connecting block 16 and the rubber strip 18, respectively. The inner walls of the mounting frame 6 and the telescopic cavity 11 are provided with sliding grooves 14. A slider 15 is fixedly installed on one end of the upper heat sealing knife 9 and both ends of the lower heat sealing knife 12. One end of the slider 15 extends into the interior of the sliding groove 14 and is slidably connected to the mounting frame 6. A feeding roller 20 is rotatably installed on the inner side of the processing table 1. There are two feeding rollers 20. A conveyor belt 4 is installed between the two feeding rollers 20 and is connected to the feeding rollers 20. A motor 3 is fixedly installed on one side of one end of the processing table 1 and the output end of the motor 3 is connected to one end of the feeding roller 20. A vibration damping support leg 2 is fixedly installed below the processing table 1. There are four vibration damping support legs 2 and the four vibration damping support legs 2 are located at the four corners of the processing table 1.

[0017] In use: Lay the packaging bag flat on the conveyor belt 4 with the side to be sealed facing the sealing structure. Turn on the motor 3 to drive the feeding roller 20 to rotate. As the feeding roller 20 rotates, it drives the conveyor belt 4 to move, sending the packaging bag to the sealing area and temporarily stopping the conveying. Drive the first electric telescopic cylinder 8 to drive the upper heat sealing knife 9 to descend. The rubber strip 18 falls down with the upper heat sealing knife 9 and first contacts the packaging bag. With the help of the rubber strip 18, it clamps and fixes the packaging bag from one side of the sealing part. Then, drive the first electric telescopic cylinder 8 to drive the upper heat sealing knife 9 to descend, and the second electric telescopic cylinder 10 to drive the lower heat sealing knife 12 to rise. The upper heat sealing knife 9 and the lower heat sealing knife 12 contact the upper and lower end faces of the packaging bag respectively. The upper heat sealing knife 9 and the lower heat sealing knife 12 heat and melt the packaging strip at the same time. After cooling, a seal is formed and the packaging bag is sealed.

[0018] Please see Figure 1 , Figure 2 and Figure 3A push plate 7 is installed above the conveyor belt 4 and is in close contact with the conveyor belt 4. A third electric telescopic cylinder 13 is installed on one side of the push plate 7 and is connected to the processing table 1 by screws. The telescopic end of the third electric telescopic cylinder 13 is connected to the back of the push plate 7. A guide plate 5 is fixedly installed on one side of the processing table 1 and is flush with the upper end of the conveyor belt 4. The guide plate 5 is inclined. The third electric telescopic cylinder 13 drives the push plate 7 to telescopically move. The moving push plate 7 contacts the sealed packaging bag on the conveyor belt 4 and applies a pushing force to push the packaging bag from the conveyor belt 4 onto the guide plate 5. The packaging bag falls down along the guide plate 5.

[0019] Working principle: The packaging bag is laid flat on the conveyor belt 4 with the side to be sealed facing the sealing structure. The motor 3 is turned on to drive the feeding roller 20 to rotate. As the feeding roller 20 rotates, it drives the conveyor belt 4 to move, sending the packaging bag to the sealing area and temporarily stopping the conveying. The first electric telescopic cylinder 8 is driven to drive the upper heat sealing knife 9 to descend. The rubber strip 18 falls down with the upper heat sealing knife 9 and first contacts the packaging bag. The rubber strip 18 clamps and fixes the packaging bag from one side of the sealing part. Then, the first electric telescopic cylinder 8 is driven to drive the upper heat sealing knife 9 to descend, and the second electric telescopic cylinder 10 drives the lower heat sealing knife 12 to rise. The upper heat sealing knife 9 and the lower heat sealing knife 12 respectively... The upper heat sealing knife 9 and the lower heat sealing knife 12 simultaneously heat and melt the packaging tape in contact with the upper and lower surfaces of the packaging bag. After cooling, a seal is formed, thus sealing the packaging bag. After sealing, the first electric telescopic cylinder 8 is driven to raise the upper heat sealing knife 9, and the second electric telescopic cylinder 10 is driven to lower the lower heat sealing knife 12, separating the rubber strip 18, the upper heat sealing knife 9 and the lower heat sealing knife 12 from the packaging bag. Then, the third electric telescopic cylinder 13 is driven to move the push plate 7. The moving push plate 7 contacts the sealed packaging bag on the conveyor belt 4 and applies a pushing force, pushing the packaging bag from the conveyor belt 4 onto the guide plate 5. The packaging bag falls down along the guide plate 5.

[0020] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing device for producing packaging bags, comprising a processing table (1), characterized in that: A mounting bracket (6) is fixedly installed above one end of the processing table (1), and the mounting bracket (6) is L-shaped. An upper heat sealing knife (9) is installed on the inner side of the mounting bracket (6). A first electric telescopic cylinder (8) is fixedly installed above the mounting bracket (6), and the telescopic end of the first electric telescopic cylinder (8) is connected to the upper end of the upper heat sealing knife (9). A telescopic cavity (11) is provided inside one end of the processing table (1), and a lower heat sealing knife (12) is movably installed inside the telescopic cavity (11). A second electric telescopic cylinder (10) is fixedly installed below the processing table (1), and the telescopic end of the second electric telescopic cylinder (10) is connected to the upper end of the lower heat sealing knife (9). The lower end of the sealing knife (12) is connected to a connecting block (16) fixedly installed on one side of the upper heat sealing knife (9). There are two connecting blocks (16), and the two connecting blocks (16) are located on one side of both ends of the upper heat sealing knife (9). A rubber strip (18) is installed below one side of the upper heat sealing knife (9). A connecting rod (17) is fixedly installed above both ends of the rubber strip (18). The connecting rod (17) is slidably connected to the connecting block (16). A compression spring (19) is slidably installed on the outside of the connecting rod (17). The two ends of the compression spring (19) are in contact with the connecting block (16) and the rubber strip (18) respectively.

2. The sealing device for packaging bag production according to claim 1, characterized in that: The mounting bracket (6) and the inner wall of the telescopic cavity (11) are both provided with sliding grooves (14). A slider (15) is fixedly installed at one end of the upper heat sealing knife (9) and both ends of the lower heat sealing knife (12). One end of the slider (15) extends into the interior of the sliding groove (14), and the slider (15) is slidably connected to the mounting bracket (6).

3. The sealing device for packaging bag production according to claim 1, characterized in that: The processing table (1) is rotatably mounted with a feeding roller (20). There are two feeding rollers (20). A conveyor belt (4) is installed between the two feeding rollers (20), and the conveyor belt (4) is connected to the feeding roller (20) in a transmission. A motor (3) is fixedly installed on one side of one end of the processing table (1), and the output end of the motor (3) is connected to one end of the feeding roller (20).

4. A sealing device for packaging bag production according to claim 1, characterized in that: Vibration damping support legs (2) are fixedly installed below the processing table (1). There are four vibration damping support legs (2), and the four vibration damping support legs (2) are located at the four corners of the processing table (1).

5. A sealing device for packaging bag production according to claim 3, characterized in that: A push plate (7) is installed above the conveyor belt (4), and the push plate (7) is in contact with the conveyor belt (4). A third electric telescopic cylinder (13) is installed on one side of the push plate (7), and the third electric telescopic cylinder (13) is connected to the processing table (1) by screws. The telescopic end of the third electric telescopic cylinder (13) is connected to the back of the push plate (7).

6. A sealing device for packaging bag production according to claim 1, characterized in that: A guide plate (5) is fixedly installed on one side of the processing table (1), and the upper end of the guide plate (5) is flush with the upper end of the conveyor belt (4). The guide plate (5) is inclined.

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