A film blowing device for polyolefin film plastic bag production

Abstract

The utility model relates to a kind of blow film device for polyolefin film plastic bag production, belong to film plastic bag production technical field, including the installation platform fixed in the one side of blow film device ontology and set on the winding equipment of installation platform upper surface, the upper surface of the installation platform is provided with the guide structure and processing mechanism of cooperation winding equipment use.This polyolefin film plastic bag production blow film device, the power of winding equipment is directly transmitted to fan and stirring shaft using synchronous assembly, without additional configuration independent motor drive fan and agitator, reduce energy consumption and equipment cost, and fan rotating speed, stirring speed and film linear speed are strictly synchronous or proportional, ensure that whether production line accelerates, decelerates or uniform velocity runs, so that spray gas flow and negative pressure liquid suction volume always match line speed, spraying amount is uniform and consistent, reach dry air volume always match line speed, the advantage that drying effect is stable.

Description

Technical Field

[0001] This utility model relates to the field of film plastic bag production technology, specifically a blown film device for producing polyolefin film plastic bags. Background Technology

[0002] A blown film machine is a processing device that heats plastic granules to melt, extrudes them through an extrusion device into a die to form a film bubble, and finally winds it into a roll using a winding machine. Blown film machines are needed in the production of thin-film plastic bags. Patent CN218342825 discloses a blown film machine for producing biodegradable and environmentally friendly plastic bags, including two sets of parallel support plates. A first rotating shaft is rotatably mounted on the inner side of each support plate, and a winding roller is fitted onto the first rotating shaft. One end of the first rotating shaft is connected to a motor. A second rotating shaft and a third rotating shaft are arranged vertically on the side of the first rotating shaft, and each of the second and third rotating shafts is fitted with an extrusion roller. A heating wire is installed inside the extrusion roller. A bracket is mounted on the second rotating shaft through a limiting cylinder, and a leveling roller is installed on the inner side of the movable end of the bracket. This application allows the plastic film to soften upon heating, thus facilitating the shaping process by the extrusion rollers.

[0003] However, this utility model lacks the addition of degradation promoters before winding, and the absence of the atomization spraying process will cause the film to lose its controllable degradation ability, resulting in a decrease in production yield and subsequent processing failure. Therefore, a blown film device for the production of polyolefin film plastic bags is proposed to solve the problems mentioned above. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a blown film device for the production of polyolefin film plastic bags, which has advantages such as avoiding pollution or adhesion and improving the quality of finished products, thus solving the problems mentioned in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A blown film device for producing polyolefin film plastic bags includes a mounting platform fixed to one side of the blown film device body and a winding device disposed on the upper surface of the mounting platform. The upper surface of the mounting platform is provided with a guiding structure and a processing mechanism for use with the winding device.

[0007] The guiding structure includes two first guide rollers and a second guide roller disposed between the two first guide rollers. Roller frames are installed at the ends of the two first guide rollers, and lifting frames are installed at the ends of the second guide rollers.

[0008] The processing mechanism includes an air supply component and a liquid storage tank fixed on the upper surface of the mounting platform. A synchronization component is provided between the air supply component and the winding device. A spray rack and a drying rack for use with the air supply component are provided above the mounting platform.

[0009] Furthermore, the second guide roller is lower than the two first guide rollers, and the two first guide rollers are horizontally arranged. The two roller frames are respectively fixed to the side of the blown film device body and the upper surface of the mounting platform.

[0010] Furthermore, the gas delivery assembly includes an expansion tube, one end of which is fixed with a throat tube, and the other end of which is fixed with a connecting tube connected to the spray frame. A fan is installed inside the expansion tube, and a connecting tube connected to a liquid storage tank is fixed to the lower surface of the throat tube.

[0011] Furthermore, the synchronization component includes two synchronization shafts, with a synchronization pulley fixed at the same end of each synchronization shaft, and the other ends of the two synchronization shafts are respectively fixed to the winding device and the outer surface of the fan, and the two synchronization pulleys are connected to a synchronization belt.

[0012] Furthermore, an agitator shaft extending outward is rotatably mounted inside the liquid storage tank, and two transmission gears are installed between one of the synchronous shafts and the agitator shaft.

[0013] Furthermore, the drying rack includes a frame body, the interior of which is hollow, and an impeller is installed on the top side of the frame body. Nozzles are installed on the inner sides of both the frame body and the spray rack.

[0014] Furthermore, the spraying frame is located in front of the drying frame, the frame body is fixed to the spraying frame, and a bracket fixed to the upper surface of the mounting platform is welded at the connection between the frame body and the spraying frame.

[0015] Compared with the prior art, this utility model provides a blown film device for the production of polyolefin film plastic bags, which has the following beneficial effects:

[0016] 1. This blown film device for producing polyolefin film plastic bags utilizes a synchronization component to directly transmit the power of the winding equipment to the fan and stirring shaft, eliminating the need for an additional independent motor to drive the fan and stirrer, thus reducing energy consumption and equipment costs. Furthermore, the fan speed, stirring speed, and film linear speed are strictly synchronized or proportional, ensuring that regardless of whether the production line is accelerating, decelerating, or operating at a constant speed, the spray airflow and negative pressure liquid absorption always match the linear speed, resulting in uniform spraying volume and achieving the advantage of consistently matching the drying airflow with the linear speed, resulting in stable drying effect.

[0017] 2. This blown film device for producing polyolefin film plastic bags utilizes the Venturi effect generated by the airflow from the fan at the throat to automatically draw in and atomize the treatment liquid. It eliminates the need for an additional power-consuming liquid transfer pump, further saving energy and reducing consumption. Moreover, the high-speed airflow can effectively break up the liquid, forming fine and uniform droplets, improving the uniformity and adhesion of the treatment liquid on the film surface. The amount of liquid drawn in is determined by the airflow speed and the throat design, and is directly related to the air volume. The air volume is synchronized with the line speed, so the supply of treatment liquid can automatically adapt to changes in the production line speed. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0019] Figure 2 This is a three-dimensional view of the guiding structure of this utility model;

[0020] Figure 3 This is a three-dimensional structural view of the processing mechanism of this utility model;

[0021] Figure 4 This utility model Figure 2 A magnified structural diagram of structure A is shown.

[0022] In the diagram: 1. Film blowing device body; 2. Mounting platform; 3. Guiding structure; 31. First guide roller; 32. Second guide roller; 33. Roller frame; 34. Lifting frame; 4. Winding equipment; 5. Processing mechanism; 51. Air supply assembly; 511. Expansion pipe; 512. Throat pipe; 513. Connecting pipe; 514. Fan; 52. Spraying frame; 53. Connecting pipe; 54. Synchronization assembly; 541. Synchronization shaft; 542. Synchronization pulley; 543. Synchronization belt; 55. Liquid storage tank; 56. Stirring shaft; 57. Transmission gear; 58. Drying frame; 581. Frame body; 582. Impeller; 583. Nozzle. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1 to 4This embodiment discloses a blown film device for producing polyolefin film plastic bags, comprising a mounting platform 2 fixed to one side of the blown film device body 1 and a winding device 4 disposed on the upper surface of the mounting platform 2. The upper surface of the mounting platform 2 is provided with a guide structure 3 and a processing mechanism 5 for use with the winding device 4. It should be noted that both the blown film device body 1 and the winding device 4 are conventional technologies known to the public in the prior art, therefore their specific structural composition and working principle will not be described in detail here.

[0025] Specifically, the guiding structure 3 includes two first guide rollers 31 and a second guide roller 32 positioned between them. Each of the two first guide rollers 31 has a roller frame 33 at its end, and the second guide roller 32 has a lifting frame 34 at its end. The polyolefin film first passes around the first fixedly mounted first guide roller 31, then passes downwards around the lower-positioned second guide roller 32, and finally passes upwards around the second fixedly mounted first guide roller 31, forming an "S"-shaped path. This increases the contact area between the film and the guide rollers, which is beneficial for stable operation and subsequent processing. The second guide roller 32 is lower than the two first guide rollers 31, and the two first guide rollers 31 are horizontally positioned. The two roller frames 33 are fixed to the side of the blown film device body 1 and the upper surface of the mounting platform 2, respectively. The second guide roller 32 is mounted on the lifting frame 34. By adjusting the height of the lifting frame 34, the position of the second guide roller 32 can be changed, thereby fine-tuning the length of the film path and regulating and controlling the film tension. This ensures the film enters the processing area and is wound flat and wrinkle-free, while the two horizontal first guide rollers 31 provide stable support points.

[0026] To improve the winding effect, the processing mechanism 5 includes an air supply assembly 51 and a liquid storage tank 55 fixed to the upper surface of the mounting platform 2. A synchronization assembly 54 is provided between the air supply assembly 51 and the winding device 4. A spray rack 52 and a drying rack 58 are provided above the mounting platform 2 to cooperate with the air supply assembly 51. Specifically, the air supply assembly 51 includes an expansion tube 511. One end of the expansion tube 511 is fixed with a throat 512, and the other end of the throat 512 is fixed with a connecting pipe 53 connected to the spray rack 52. A fan 514 is installed inside the expansion tube 511, and a connecting pipe 513 connected to the liquid storage tank 55 is fixed to the lower surface of the throat 512.

[0027] To improve the linkage effect of the structure, the synchronization component 54 includes two synchronization shafts 541. A synchronization pulley 542 is fixed to the same end of each synchronization shaft 541, and the other ends of the two synchronization shafts 541 are respectively fixed to the outer surfaces of the winding device 4 and the fan 514. A synchronization belt 543 is drivingly connected to the two synchronization pulleys 542. Inside the liquid storage tank 55, a stirring shaft 56 extending outwards is rotatably mounted. Two transmission gears 57 are installed between one of the synchronization shafts 541 and the stirring shaft 56. The transmission gears 57 drive the stirring shaft 56 to rotate, continuously stirring the liquid in the liquid storage tank 55, preventing additive sedimentation, and ensuring uniform spray concentration. The Venturi effect achieves efficient mixing of liquid and gas, ensuring uniform spraying.

[0028] In this embodiment, the drying rack 58 includes a frame 581, which is hollow inside. An impeller 582 is installed on the top side of the frame 581, and nozzles 583 are installed on the inner sides of both the frame 581 and the spray rack 52. The spray rack 52 is located in front of the drying rack 58, and the frame 581 and the spray rack 52 are fixed together. A bracket that is fixed to the upper surface of the mounting platform 2 is welded to the connection between the frame 581 and the spray rack 52. When the winding equipment 4 starts, the fan 514 is driven to rotate by the synchronous shaft 541 of the synchronous component 54. The airflow is accelerated through the expansion pipe 511 and enters the throat pipe 512, generating negative pressure. The negative pressure of the throat pipe 512 draws the treatment liquid, such as antistatic agent and lubricant, from the liquid storage tank 55 through the connecting pipe 513. After mixing with the airflow, it is atomized and transported to the spraying frame 52 through the connecting pipe 53. The nozzles 583 of the spraying frame 52 spray the atomized liquid evenly onto the film surface to improve the film performance. The sprayed film enters the drying frame 58. The impeller 582 generates hot air or room temperature airflow, which quickly dries the film surface through the nozzles 583. The treated film is neatly wound up by the winding equipment 4 to complete the production.

[0029] The working principle of the above embodiments is as follows:

[0030] The blown film device body 1 extrudes molten polyolefin plastic into tubular film bubbles. The film bubbles are pulled upward and, after cooling and shaping, are pulled into the guide structure 3. The second guide roller 32 is installed on the lifting frame 34. By adjusting the height of the lifting frame 34, the position of the second guide roller 32 can be changed, thereby fine-tuning the length of the film path and playing the role of adjusting and controlling the film tension.

[0031] The power of the winding device 4 is transmitted through the synchronization component 54. The synchronous rotation drives the fan 514 to rotate. The airflow generated by the fan 514 enters the expansion tube 511. The airflow is accelerated through the narrow throat 512, forming a low-pressure zone at the throat 512. The low pressure draws the treatment liquid from the storage tank 55 through the connecting pipe 513. The high-speed airflow mixes with the sucked treatment liquid at the end of the throat 512. The mixed gas-liquid two-phase flow is transported to the spray frame 52 through the connecting pipe 53.

[0032] Next, the frame 581 of the drying rack 58 is hollow inside, which serves as an air duct. The impeller 582 at the top can further guide and accelerate the airflow. The high-speed airflow is blown through the nozzle 583 inside the drying rack 58 onto the surface of the film that has just been sprayed with the treatment liquid. The airflow quickly blows away the moisture or solvent in the liquid treatment agent on the surface of the film, accelerating its drying, film formation or penetration process, and preventing the film from sticking together when it is rolled up.

[0033] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods, and any method that achieves the desired beneficial effect can be implemented. Furthermore, all electrical components in this embodiment are electrically connected to the main controller and power supply. The main controller can be a conventional, known device such as a computer that performs control functions. Those skilled in the art can control the electrical components through simple programming, and the existing disclosed power connection technologies are common knowledge in the field. Therefore, this embodiment will not elaborate further on their specific structural composition and working principles.

[0034] It should be noted that the orientations or positional relationships indicated herein are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of facilitating the description of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] 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 blown film device for producing polyolefin film plastic bags, characterized in that: It includes a mounting platform (2) fixed to one side of the blown film device body (1) and a winding device (4) disposed on the upper surface of the mounting platform (2). The upper surface of the mounting platform (2) is provided with a guide structure (3) and a processing mechanism (5) for use with the winding device (4). The guiding structure (3) includes two first guide rollers (31) and a second guide roller (32) disposed between the two first guide rollers (31). Roller frames (33) are installed at the ends of the two first guide rollers (31), and lifting frames (34) are installed at the ends of the second guide rollers (32). The processing mechanism (5) includes an air conveying assembly (51) and a liquid storage tank (55) fixed on the upper surface of the mounting platform (2). A synchronization assembly (54) is provided between the air conveying assembly (51) and the winding device (4). A spray rack (52) and a drying rack (58) are provided above the mounting platform (2) to cooperate with the air conveying assembly (51).

2. The blown film device for producing polyolefin film plastic bags according to claim 1, characterized in that: The second guide roller (32) is lower than the two first guide rollers (31), and the two first guide rollers (31) are set horizontally. The two roller frames (33) are respectively fixed to the side of the blown film device body (1) and the upper surface of the mounting platform (2).

3. The blown film device for producing polyolefin film plastic bags according to claim 1, characterized in that: The gas delivery assembly (51) includes an expansion tube (511), one end of which is fixed with a throat tube (512), and the other end of which is fixed with a connecting tube (53) connected to the spray frame (52). A fan (514) is installed inside the expansion tube (511), and a connecting tube (513) connected to the liquid storage tank (55) is fixed on the lower surface of the throat tube (512).

4. The blown film device for producing polyolefin film plastic bags according to claim 3, characterized in that: The synchronization component (54) includes two synchronization shafts (541), with a synchronization pulley (542) fixed at the same end of each of the two synchronization shafts (541), and the other ends of the two synchronization shafts (541) are respectively fixed to the outer surfaces of the winding device (4) and the fan (514). The two synchronization pulleys (542) are connected to a synchronization belt (543).

5. The blown film device for producing polyolefin film plastic bags according to claim 4, characterized in that: The storage tank (55) is rotatably mounted inside, with an extension of a stirring shaft (56) extending outwards. Two transmission gears (57) are installed between one of the synchronization shafts (541) and the stirring shaft (56).

6. The blown film device for producing polyolefin film plastic bags according to claim 1, characterized in that: The drying rack (58) includes a frame (581), which is hollow inside. An impeller (582) is installed on the top side of the frame (581), and nozzles (583) are installed on the inner sides of both the frame (581) and the spray rack (52).

7. The blown film device for producing polyolefin film plastic bags according to claim 6, characterized in that: The spray rack (52) is located in front of the drying rack (58). The frame (581) is fixed to the spray rack (52). A bracket that is fixed to the upper surface of the mounting platform (2) is welded at the connection between the frame (581) and the spray rack (52).

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