A film shaping device for plastic bag production

Abstract

This utility model discloses a film shaping device for plastic bag production, including a frame. A rotatable cooling roller and a guide roller are mounted on the frame, with the guide roller located below the cooling roller. The cooling roller has a hollow structure, and rotary joints are mounted on the roller shafts at both ends. A cooling water tank is located on the outer side of the frame. The rotary joints at both ends are connected to the interior of the cooling water tank via inlet and outlet pipes, respectively. A cooling pipe assembly is installed inside the cooling water tank, and the cooling pipe assembly is connected to a refrigeration unit via pipes. This utility model returns the cooling medium from the cooling roller to the cooling water tank via the outlet pipe, ensuring the recycling of the cooling medium. The cooling pipe assembly in the cooling water tank ensures that the cooling medium in the tank is kept at a low temperature, thereby guaranteeing the cooling effect of the cooling roller.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic bag production equipment, specifically to a film shaping device for plastic bag production. Background Technology

[0002] In the processing and production of plastic bags, plastic granules are first fed into a mixer for stirring. The stirred granules are then melted and extruded into a film tube via an extruder. Next, air is blown into the film tube by a blown film machine, causing it to expand and form large bubbles. These bubbles are then conveyed by conveyor rollers to form a film. To increase the forming speed of the plastic film, cooling rollers are installed in the conveying equipment. As the film slides across the surface of the cooling rollers, they cool and set the film. If printing is required, the plastic bags can be printed on their surface. Finally, the plastic film is wound into a tubular film by a winding machine. The tubular film is placed in plastic bag forming equipment for cutting and sealing, resulting in the finished plastic bag. The cooling and forming process of the plastic film is a crucial step in ensuring film quality. To improve the cooling effect, a utility model patent with publication number CN221518750U, entitled "Cooling Structure for Cast Film Machine for CPE Plastic Bag Processing," discloses a cooling roller structure. This structure involves making the cooling roller hollow and installing rotary joints on its two roller shafts. The rotary joints are connected to a water tank via water pipes. The cooling medium enters the cooling roller through one rotary joint and flows out through the other, thus achieving a circulating flow of the cooling medium within the cooling roller and improving its cooling effect. However, this patent does not specify the destination of the cooling medium after it flows out. Direct discharge would waste the medium, while returning it to the water tank would cause the temperature of the medium in the tank to rise continuously, affecting the subsequent cooling effect. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a film shaping device for plastic bag production, thereby solving the aforementioned technical problems.

[0004] The present invention adopts the following technical solution: a film shaping device for plastic bag production, comprising a frame, on which a rotatable cooling roller and a guide roller are arranged, the guide roller being located below the cooling roller, the cooling roller having a hollow structure, and rotary joints being arranged on the roller shafts at both ends of the cooling roller, a cooling water tank being arranged on the outside of the frame, the rotary joints at both ends being connected to the interior of the cooling water tank through an inlet pipe and a return pipe respectively, a cooling pipe assembly being arranged inside the cooling water tank, and the cooling pipe assembly being connected to a refrigeration unit through a pipeline.

[0005] Furthermore, the cooling pipe assembly includes two mirror-arranged distribution boxes, with several cooling pipes evenly distributed between the two distribution boxes. The cooling pipes are connected to the two distribution boxes. One distribution box is equipped with an air inlet connector, which is connected to the refrigeration unit through a pipeline. The other distribution box is equipped with an exhaust connector. Both the air inlet connector and the exhaust connector extend outward from the cooling water tank.

[0006] Furthermore, the cooling pipe is evenly provided with several heat exchange fins.

[0007] Furthermore, the upper end of the cooling water tank is provided with several heat dissipation holes evenly distributed along its circumference.

[0008] Furthermore, a water supply pump is installed inside the cooling water tank, and two pipe joints are respectively installed at the upper and lower ends of the upper side wall of the cooling water tank. The inlet pipe is connected to the lower pipe joint, and the return pipe is connected to the upper pipe joint. The lower pipe joint is connected to the water supply pump through a water pipe, and the upper pipe joint is provided with an outlet pipe at one end of the cooling water tank. A return pump is connected to the return pipe.

[0009] Furthermore, a water inlet is provided on the top of the cooling water tank, and a cover plate is provided at the water inlet.

[0010] Furthermore, a rotating shaft is provided on the frame at a position corresponding to the guide roller, and heat dissipation blades are evenly distributed on the rotating shaft.

[0011] Furthermore, a first motor is provided on the frame at a position corresponding to one end of the rotating shaft, and the first motor drives the rotating shaft to rotate.

[0012] Furthermore, a second motor is provided at the bottom of the frame, a first sprocket is provided on the roller shaft on one side of the cooling roller, and a second sprocket is provided on the drive shaft of the second motor. The two sprockets are connected by a chain.

[0013] Furthermore, the refrigeration unit is a refrigeration compressor.

[0014] The above-mentioned technical solution of this utility model has the following beneficial effects: This utility model returns the cooling medium in the cooling roller to the cooling water tank through the return water pipe, which can ensure the recycling of the cooling medium. The cooling pipe group in the cooling water tank can ensure the cooling medium in the cooling water tank is cooled, thereby ensuring that the cooling medium in the cooling water tank can always be kept at a low temperature, thus ensuring the cooling effect of the cooling roller. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the main plan view structure of an embodiment of this utility model;

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0020] like Figure 1-2 As shown, this utility model embodiment provides a film shaping device for plastic bag production, including a frame 1. The frame 1 is equipped with a rotatable cooling roller 2 and a guide roller 3. The guide roller 3 is located below the cooling roller 2. The cooling roller 2 has a hollow structure. Rotary joints 4 are provided on the roller shafts at both ends of the cooling roller 2. A cooling water tank 5 is provided on the outside of the frame 1. The rotary joints 4 at both ends are connected to the interior of the cooling water tank 5 through a water inlet pipe 6 and a water return pipe 7, respectively. A cooling pipe assembly is provided inside the cooling water tank 5. The cooling pipe assembly is connected to a refrigeration unit through pipes.

[0021] The cooling pipe assembly includes two mirror-arranged distribution boxes 8, with several cooling pipes 9 evenly distributed between the two distribution boxes 8. The cooling pipes 9 are connected to the two distribution boxes 8. An air inlet connector 10 is provided on one distribution box 8, and the air inlet connector 10 is connected to the refrigeration unit through a pipe. An exhaust connector 11 is provided on the other distribution box 8. Both the air inlet connector 10 and the exhaust connector 11 extend to the outside of the cooling water tank 8.

[0022] Several heat exchange fins 12 are evenly distributed on the cooling pipe 9.

[0023] Several heat dissipation holes 13 are evenly distributed around the upper end of the cooling water tank 5 to ensure air circulation inside the cooling water tank 5.

[0024] A water supply pump 14 is installed inside the cooling water tank 5. Two pipe joints 16 are respectively installed at the upper and lower ends of the upper side wall of the cooling water tank 6. The inlet pipe 6 is connected to the lower pipe joint 16, and the return pipe 7 is connected to the upper pipe joint 16. The lower pipe joint 16 is connected to the water supply pump 14 through a water pipe. The upper pipe joint 16 is located at one end of the cooling water tank 5 and has an outlet pipe. The return pipe 7 is connected to the return pump 15.

[0025] The top of the cooling water tank 5 is equipped with a water inlet, and a cover plate 17 is provided at the water inlet. By opening the cover plate 17, cooling medium can be added to the cooling water tank 5 through the water inlet.

[0026] A rotating shaft 18 is provided on the frame 1 below the corresponding guide roller 3, and heat dissipation blades 19 are evenly distributed on the rotating shaft 18.

[0027] A first motor 20 is installed on the frame 1 at one end of the corresponding rotating shaft 18, and the first motor 20 drives the rotating shaft 18 to rotate.

[0028] A second motor 21 is installed at the bottom of the frame 1, a first sprocket 22 is installed on the roller shaft on one side of the cooling roller 2, and a second sprocket 23 is installed on the drive shaft of the second motor 21. The two sprockets are connected by a chain 24.

[0029] Preferably, the refrigeration unit is a refrigeration compressor.

[0030] The frame 1 is equipped with a control cabinet, which contains a PLC control system. The PLC control system can coordinate the operation of the chiller, water supply pump 14, return water pump 15 and motor.

[0031] The working principle of this utility model is as follows: The second motor 21 drives the cooling roller 2 to rotate. When the plastic film is conveyed, it passes around the surface of the cooling roller 2, and then passes around the guide roller 3 before being conveyed to the subsequent processing equipment. During operation, both the water supply pump 14 and the return pump 15 in the cooling water tank 5 are started. The water supply pump 14 sends the cooling medium into the cavity inside the cooling roller 2 through the water inlet pipe 6. The cooling medium can cool the cooling roller 2. When the plastic film is conveyed on the cooling roller 2, it will be quickly cooled and formed. Then the cooling medium is returned to the cooling roller 2 through the return pipe 7. The cooling medium is discharged and re-enters the cooling water tank 5 through the pipeline. The refrigeration compressor generates cold air and sends it into the distribution box 8 on one side through the pipeline. The cold air is then distributed through the cooling pipes 9, which cool the medium in the cooling water tank 5 to ensure the cooling effect of the cooling roller 2. The cold air then enters the distribution box 8 on the other side for discharge. At the same time, the first motor 20 drives the rotating shaft 18 and the heat dissipation blades 19 on it to rotate. The heat dissipation blades 19 generate airflow, which can also accelerate the cooling and shaping of the plastic film.

[0032] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A film shaping device for plastic bag production, characterized in that: The device includes a frame on which a rotatable cooling roller and a guide roller are mounted. The guide roller is located below the cooling roller. The cooling roller has a hollow structure, and rotary joints are mounted on the roller shafts at both ends of the cooling roller. A cooling water tank is mounted on the outside of the frame. The rotary joints at both ends are connected to the interior of the cooling water tank through an inlet pipe and a return pipe, respectively. A cooling pipe assembly is mounted inside the cooling water tank, and the cooling pipe assembly is connected to a refrigeration unit through pipes.

2. The film shaping device for plastic bag production according to claim 1, characterized in that: The cooling pipe assembly includes two mirror-arranged distribution boxes, with several cooling pipes evenly distributed between the two distribution boxes. The cooling pipes are connected to the two distribution boxes. An air inlet connector is provided on one distribution box, which is connected to the refrigeration unit through a pipeline. An exhaust connector is provided on the other distribution box. Both the air inlet connector and the exhaust connector extend to the outside of the cooling water tank.

3. The film shaping device for plastic bag production according to claim 2, characterized in that: The cooling pipe is evenly provided with several heat exchange fins.

4. The film shaping device for plastic bag production according to claim 3, characterized in that: The upper end of the cooling water tank is provided with several heat dissipation holes evenly distributed along its circumference.

5. A film shaping device for plastic bag production according to claim 4, characterized in that: The cooling water tank is equipped with a water supply pump. Two pipe joints are respectively installed at the upper and lower ends of the upper side wall of the cooling water tank. The inlet pipe is connected to the lower pipe joint, and the return pipe is connected to the upper pipe joint. The lower pipe joint is connected to the water supply pump through a water pipe. The upper pipe joint is located at one end of the cooling water tank and is equipped with an outlet pipe. The return pipe is connected to a return pump.

6. The film shaping device for plastic bag production according to claim 5, characterized in that: The top of the cooling water tank is provided with a water inlet, and a cover plate is provided at the water inlet.

7. The film shaping device for plastic bag production according to claim 1, characterized in that: A rotating shaft is provided on the frame at a position corresponding to the guide roller, and heat dissipation blades are evenly distributed on the rotating shaft.

8. The film shaping device for plastic bag production according to claim 7, characterized in that: A first motor is provided on the frame at one end corresponding to the rotating shaft, and the first motor drives the rotating shaft to rotate.

9. A film shaping device for plastic bag production according to claim 1, characterized in that: A second motor is installed at the bottom of the frame, a first sprocket is installed on the roller shaft on one side of the cooling roller, and a second sprocket is installed on the drive shaft of the second motor. The two sprockets are connected by a chain.

10. A film shaping device for plastic bag production according to claim 1, characterized in that: The refrigeration unit is a refrigeration compressor.

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