Feeding device of film blowing machine

Abstract

The utility model discloses a feeding device of a film blowing machine. The feeding device comprises a feeding hopper, a plastic crushing assembly, a plastic particle screen and a material guide rod, the lower portion of the feeding hopper communicates with a screw extruder through a feeding channel, and the plastic smashing assembly comprises a smashing roller set arranged in an inner cavity of the feeding channel so that large-size particles and bonded and clustered particles can be fully smashed again before hot melting. The plastic particle screen is located below the plastic crushing assembly and is provided with a plurality of meshes, the material guide rod is close to the surface of the screen, rotates and sweeps on the surface of the plastic particle screen around the rotating shaft and is used for sweeping plastic particles falling on the plastic particle screen and squeezing the plastic particles into the meshes, and the plastic particles are separated under stress when being squeezed into the meshes. The plastic particles which are bonded and clustered can be loosened, and the passing plastic particles are in a required size range, so that the situation that the melting degree of the overlarge or clustered plastic particles in a screw extruder is not enough subsequently is avoided, accumulation and blockage at a machine head are prevented, and the film forming quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of film blowing, in particular to a feeding device of a film blowing machine. Background Art

[0002] The film blowing machine is a device that heats and melts plastic particles and then blows them into thin films. During the plastic particle processing process, the plastic particles are fed into the screw extruder below through a feed hopper. The screw extruder filters the hot melt plastic particles from the die head and extrude them through a heated die head. The film bubbles are cooled by an air ring and then blown into film bubbles. The bubbles are then passed through structures such as a bubble stabilizing rack, a herringbone plate, a traction roller, and a winding device to obtain a rolled plastic film at the winding device.

[0003] Feeding plastic particles from the feed hopper to the screw extruder is the first step in the film blowing process. However, since the size of the plastic particles used as raw materials is difficult to unify, and some plastic particles may stick together to form large-sized agglomerates, the melting speed of the plastic particles is different during the heating process of the screw extruder. Some larger plastic particles or agglomerates melt slowly. Insufficient heating of these plastic particles or agglomerates will affect the quality of the film and are prone to accumulation and blockage at the head of the screw extruder, affecting the normal operation of the film blowing machine.

[0004] Therefore, it is necessary to propose corresponding improvement plans for the above-mentioned feeding problems of the film blowing machine in the prior art. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a feeding device for a film blowing machine to solve the above problems.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] The utility model provides a feeding device for a film blowing machine, which comprises a feeding hopper, a plastic crushing component, a plastic particle screen and a guide rod.

[0008] The feed hopper is open at the top and connected to a screw extruder at the bottom through a feed channel, which is used to transport the plastic particles entering the hopper to the screw extruder; the plastic crushing assembly includes a crushing roller group arranged in the inner cavity of the feed channel, which is used to crush the plastic particles falling from the feed hopper; the plastic particle screen is located below the plastic crushing assembly, and the edge of the plastic particle screen is adjacent to the inner cavity of the feed channel, and a plurality of mesh holes are provided on the plastic particle screen; the guide rod is close to the surface of the plastic particle screen, and the guide rod is connected to a rotating shaft arranged at the center of the plastic particle screen, and the guide rod rotates and sweeps around the rotating shaft on the surface of the plastic particle screen, which is used to sweep the plastic particles that fall on the plastic particle screen and squeeze the plastic particles into the mesh holes.

[0009] Preferably, an extraction cylinder connected to the feed hopper is mounted on the opening above the feed hopper, and interfaces are respectively provided on the extraction cylinder, through which an extraction pipe and an exhaust fan pipe are connected, the extraction pipe is used to connect to a loading container filled with plastic particles, and the exhaust fan pipe is used to connect to the exhaust fan, so that the plastic particles in the loading container are drawn into the extraction cylinder by the exhaust fan, so that the plastic particles fall into the feed hopper.

[0010] Preferably, the edge of the plastic particle screen forms an arc-shaped surface extending obliquely upward, so that the plastic particle screen forms a dish-shaped structure.

[0011] Preferably, the edge of the plastic particle screen is connected to the inner cavity of the feed channel via an elastic member.

[0012] Preferably, a transmission worm is connected below the rotating shaft and penetrates into the inner cavity of the feed channel. The transmission worm is connected to the output shaft of the rotary drive motor to drive the rotating shaft to drive the guide rod.

[0013] Preferably, a preheating rod is further provided in the inner cavity of the feed channel, and the preheating rod is located below the crushing roller group and above the plastic particle screen.

[0014] Preferably, a mounting beam is provided across the opening above the feed hopper, the bottom of the extraction barrel is locked on the mounting beam, and a filter is provided inside the extraction barrel between the interface of the extraction pipe and the interface of the exhaust fan pipe to prevent plastic particles from entering the interface of the exhaust fan pipe from the interface of the extraction pipe.

[0015] Preferably, a transparent window is provided on the feed channel.

[0016] The technical effects achieved by the technical solution of this utility model mainly include:

[0017] The feeding device of the above-mentioned film blowing machine introduces a plastic crushing component into the feeding channel below the feed hopper to further crush the plastic particles. Some large-sized plastic particles and bonded plastic agglomerates can be fully crushed, and the plastic particles are swept into the mesh of the plastic particle screen by the rotating and sweeping guide rod on the plastic particle screen. When the plastic particles are squeezed into the mesh, they are separated by force, which plays a role in loosening the plastic particles that are bonded together. This can prevent the plastic particles from melting too slowly in the screw extruder due to being too large or bonded together into agglomerates, prevent accumulation and blockage at the head of the screw extruder, maintain the stable operation of the film blowing machine, and ensure the quality of film formation;

[0018] A suction cylinder is set up above the feed hopper, and the suction cylinder is connected to a suction pipe and an exhaust fan pipe. The suction pipe is used to connect to the loading container containing plastic particles, and the exhaust fan pipe is used to connect to the exhaust fan. The exhaust fan is used to draw the plastic particles in the loading container into the suction cylinder, so that the plastic particles fall into the feed hopper. There is no need for operators to manually lift the loading container and then pour the plastic particles into the feed hopper, which realizes feeding automation and improves working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the feeding device of the film blowing machine provided by the present invention;

[0020] Figure 2 This is a schematic diagram of the connection between the guide rod and the plastic particle screen in the feeding device;

[0021] Figure 3 To correspond Figure 1 A partial enlarged view of the circular dotted frame structure A in FIG.

[0022] The reference numerals in the above drawings are:

[0023] Feed hopper 1, feed channel 11, mounting beam 12;

[0024] Plastic crushing assembly 2, crushing roller group 21;

[0025] Plastic granule screen 3, mesh 30, edge 31 of the plastic granule screen;

[0026] Guide rod 4;

[0027] Rotating shaft 5, transmission worm 51;

[0028] Extraction barrel 6, extraction pipe 61, exhaust fan pipe 62;

[0029] Preheating rod 7;

[0030] Screw extruder 200. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the present invention shown in and described with reference to the accompanying drawings are merely exemplary, and the present invention is not limited to these embodiments.

[0032] To avoid obscuring the present invention with unnecessary detail, the accompanying drawings only illustrate structures and / or processing steps closely related to the present invention, while omitting other less relevant details. It should be noted that the wavy lines in the following figures represent the omission of the extended portions of the feed pipe 61 and the exhaust fan pipe 62 described below. These portions have been appropriately extended to clearly illustrate the rotating shaft 5 and the connected drive worm 51.

[0033] Combine Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a feeding device for a film blowing machine, which includes a feeding hopper 1, a plastic crushing assembly 2, a plastic particle screen 3 and a guide rod 4.

[0034] The upper portion of the feed hopper 1 is open, and the lower portion is connected to a screw extruder 200 through a feed channel 11, which is used to transport the plastic particles entering the hopper to the screw extruder 200;

[0035] The plastic crushing assembly 2 includes a crushing roller set 21 arranged in the inner cavity of the feed channel 11, which is used to crush the plastic particles falling from the feed hopper 1;

[0036] like Figure 2 As shown, the plastic particle screen 3 is located below the plastic crushing assembly 2, and the edge 31 of the plastic particle screen 3 borders the inner cavity of the feed channel 11. The plastic particle screen 3 is provided with a plurality of mesh holes 30;

[0037] Combine Figure 2 and Figure 3 As shown, the guide rod 4 is close to the surface of the plastic particle screen 3, and the guide rod 4 is connected to a rotating shaft 5 arranged at the center of the plastic particle screen 3. The guide rod 4 rotates and sweeps around the rotating shaft 5 on the surface of the plastic particle screen 3 to sweep the plastic particles falling on the plastic particle screen 3 and squeeze the plastic particles into the mesh 30.

[0038] During the operation of the feeding device of the film blowing machine, the plastic particles put into the feed hopper 1 will first fall into the crushing roller group 21 at the feed channel 11, so that some large-sized plastic particles and bonded plastic agglomerates are fully crushed again, and then fall onto the plastic particle screen 3 and pass through each mesh 30. The size of the mesh 30 is selected according to the required plastic particle size, which can ensure that the plastic particles passing through are within the required size range. If some plastic particles are still bonded to each other, they will be swept by the guide rod 4 rotating and sweeping on the surface of the plastic particle screen 3 and pressed into the mesh 30, so that the bonded plastic particles can be squeezed and separated when passing through the mesh 30, further loosening the plastic particles. Thus, the plastic particles enter the screw extruder 200 after passing through the mesh 30, which can avoid the plastic particles from melting too slowly in the screw extruder 200 due to being too large or bonded into agglomerates, prevent accumulation and blockage at the head of the screw extruder, and maintain stable operation of the film blowing machine. In other words, the feeding device of the above-mentioned film blowing machine can crush the raw materials into plastic particles in the same feeding process, eliminating the need to crush the raw materials into plastic particles on other equipment and then transfer them to the film blowing machine for feeding, saving processes and improving operating efficiency.

[0039] Furthermore, an extraction cylinder 6 connected to the feed hopper 1 is mounted on the opening above the feed hopper 1. Interfaces are respectively provided on the extraction cylinder 6, and an extraction pipe 61 and an exhaust fan pipe 62 are connected through different interfaces. The interface of the exhaust fan pipe 62 is generally arranged at an interface away from the extraction pipe 61, and the interface of the exhaust fan pipe 62 is located higher than the interface of the extraction pipe 61, so as to reduce the possibility of plastic particles being sucked into the exhaust fan pipe 62. The extraction pipe is used to connect to a loading container filled with plastic particles, and the exhaust fan pipe 62 is used to connect to an exhaust fan, so as to draw the plastic particles in the loading container into the extraction cylinder 6 through the exhaust fan, so that the plastic particles fall into the feed hopper 1. When the exhaust fan is started, the plastic particles in the loading container connected to the extraction pipe 61 are drawn into the extraction cylinder 6, and the plastic particles in the extraction cylinder 6 then fall into the feed hopper 1. There is no need for the operator to manually lift the loading container and pour it into the feed hopper 1, thereby realizing feeding automation, improving operation efficiency, and saving human resources.

[0040] Since the two ends of the rotating shaft 5 need to maintain a certain distance from the inner cavity of the feed channel 11 to prevent mutual scratching, the edge 31 of the plastic particle screen 3 forms an arc surface extending obliquely upward, so that the plastic particle screen 3 has a disc-shaped structure. The edge 31 of the plastic particle screen 3 constitutes the spacing area between the two ends of the rotating shaft 5 and the inner cavity of the feed channel 11, and the formation of the arc surface allows the plastic particles to naturally slide down to the edge 31 of the plastic particle screen 3 where the plastic particles are arranged, ensuring that the plastic particles pass through more smoothly.

[0041] On this basis, the edge of the plastic particle screen 3 is connected to the inner cavity of the feeding channel 11 through an elastic member, and the plastic particle screen 3 can slightly shake like a dipper under the action of the elastic member during work, which can further avoid the adhesion of the plastic particles.

[0042] Specifically, as an embodiment for realizing rotation of the rotating shaft 5, a transmission worm 51 penetrating into the inner cavity of the feeding channel 11 is connected to the lower part of the rotating shaft 5, and the transmission worm 51 is connected to the output shaft of a rotating driving motor to drive the rotating shaft 5 to drive the guide rod 4.

[0043] Due to the structure of the plastic particle screen 3, some plastic particles will be temporarily stopped at the plastic particle screen 3, and the inner cavity of the feeding channel 11 is also provided with a preheating rod 7, which is located below the crushing roller group 21 and above the plastic particle screen 3. According to actual requirements, the temperature of the preheating rod 7 is reasonably controlled to preheat the plastic particles before entering the screw extruder 200, which is beneficial to the plastic particles to be more easily and fully heated and melted in the screw extruder 200, and reliable film forming.

[0044] Specifically, a filter screen is arranged between the interface of the suction pipe 61 and the interface of the suction fan pipe 62 in the inside of the suction cylinder 6, for blocking the plastic particles from entering the interface of the suction fan pipe 62 from the interface of the suction pipe 61. The upper opening of the feeding hopper 1 is provided with a mounting cross beam 12 crossing the opening, and the bottom of the suction cylinder 6 is locked to the mounting cross beam 12.

[0045] In order to facilitate the operator to observe the situation of the plastic particles being crushed and falling in the inner cavity of the feeding channel 11, a transparent window is arranged on the feeding channel 11.

[0046] It should be noted that, in this document, the terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0047] The above is only a specific implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A feeding device for a film blowing machine, characterized in that: include: A feed hopper (1), the upper portion of the feed hopper (1) is open, and the lower portion is connected to a screw extruder (200) via a feed channel (11), and is used to transport plastic particles entering the hopper to the screw extruder (200); A plastic crushing assembly (2), comprising a crushing roller assembly (21) arranged in the inner cavity of the feed channel (11) and used for crushing plastic particles falling from the feed hopper (1); A plastic particle screen (3), the plastic particle screen (3) being located below the plastic crushing assembly (2), the edge (31) of the plastic particle screen (3) being adjacent to the inner cavity of the feed channel (11), and the plastic particle screen (3) being provided with a plurality of mesh holes (30); A guide rod (4) is provided, the guide rod (4) being close to the surface of the plastic particle screen (3), the guide rod (4) being connected to a rotating shaft (5) provided at the center of the plastic particle screen (3), the guide rod (4) rotating and sweeping around the rotating shaft (5) on the surface of the plastic particle screen (3), for sweeping the plastic particles falling on the plastic particle screen (3) and squeezing the plastic particles into the mesh (30).

2. The feeding device of the film blowing machine according to claim 1, characterized in that, An extraction cylinder (6) connected to the feed hopper (1) is provided at an opening above the feed hopper (1). Interfaces are respectively provided on the extraction cylinder (6), and an extraction pipe (61) and an exhaust fan pipe (62) are connected through different interfaces. The extraction pipe is used to connect to a loading container filled with plastic particles, and the exhaust fan pipe (62) is used to connect to the exhaust fan, so that the plastic particles in the loading container are extracted into the extraction cylinder (6) by the exhaust fan, so that the plastic particles fall into the feed hopper (1).

3. The feeding device of the film blowing machine according to claim 1, characterized in that: The edge (31) of the plastic particle screen (3) forms an arc-shaped surface extending obliquely upward, so that the plastic particle screen (3) forms a dish-shaped structure.

4. The feeding device of the film blowing machine according to claim 3, characterized in that: The edge of the plastic particle screen (3) is connected to the inner cavity of the feed channel (11) via an elastic member.

5. The feeding device of the film blowing machine according to claim 1, characterized in that: A transmission worm (51) is connected below the rotating shaft (5) and penetrates into the inner cavity of the feeding channel (11). The transmission worm (51) is connected to the output shaft of the rotary drive motor to drive the rotating shaft (5) to drive the guide rod (4).

6. The feeding device of the film blowing machine according to claim 1, characterized in that: A preheating rod (7) is also provided in the inner cavity of the feed channel (11), and the preheating rod (7) is located below the crushing roller group (21) and above the plastic particle screen (3).

7. The feeding device of the film blowing machine according to claim 2, characterized in that: A mounting crossbeam (12) spanning the opening is provided at the upper opening of the feed hopper (1), and the bottom of the extraction cylinder (6) is locked on the mounting crossbeam (12). A filter is provided inside the extraction cylinder (6) between the interface of the extraction pipe (61) and the interface of the exhaust pipe (62) to prevent plastic particles from entering the interface of the exhaust pipe (62) from the interface of the extraction pipe (61).

8. The feeding device of the film blowing machine according to claim 1, characterized in that: A transparent window is provided on the feed channel (11).

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