A plastic film blowing machine filter screen assembly

Abstract

The utility model provides a kind of plastic film blowing machine filter screen assembly, including feed cylinder and its inside is provided with push mechanism, the front side of the bottom end of feed cylinder is hingedly installed with arc door, the push mechanism includes driving mechanism and push plate, one end of the push plate is fixedly provided with elastic plate, one end of the push plate is correspondingly fixedly provided with cross bar in the inside of elastic plate. Through servo motor, gear, gear ring can rotate adjusting to swivel ring and oval ring, through oval ring and annular groove can be transversely moved adjusting to limiting rod, can be reciprocating transversely moved by limiting rod, cross bar and push plate, it is convenient to push and pull extrusion agitation to plastic particles in feed cylinder by push plate, it is convenient to filter plastic particles, and plastic particles can be prevented from scattering, simultaneously, it is convenient to clean larger plastic particles on filter screen by opening arc door, the practicability of the filter screen assembly can be improved.

Description

Technical Field

[0001] This utility model relates to the field of blown film machine technology, specifically to a filter screen assembly for a plastic blown film machine. Background Technology

[0002] A plastic blown film machine is a device that heats and melts plastic granules before blowing them into a thin film. The film is formed through inflation, cooling, and winding. When the plastic granules enter the machine's substrate, they are heated and melted. If there is a significant difference in the size of the plastic granules, the larger granules cannot melt simultaneously with the smaller ones, which can negatively impact the film product.

[0003] Chinese utility model patent CN217531800U discloses a feeding and filtering device for a blown film machine. The device includes a filter, a filter screen, a feeding outlet, a telescopic rod, a fixed arm, a rocker mechanism, a rotating disk, a lever, and a motor. The filter screen is installed inside the top of the filter, and the feeding outlet is located on the side of the filter. A telescopic rod is installed at the rear of the filter, and a fixed arm is installed at the bottom of the telescopic rod, which secures the filter to the feeding port of the blown film machine. The filter can be shaken by the motor, connecting rod, rotating rod, and arc-shaped sliding disk, which easily causes plastic particles to spill out of the filter. Furthermore, it is inconvenient to clean larger plastic particles from the filter, reducing the practicality of the device.

[0004] Therefore, this utility model provides a filter screen assembly for a plastic blown film machine. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a filter assembly for a plastic blown film machine, thereby solving the problems mentioned in the background section. This invention uses a drive mechanism to reciprocate laterally move the limiting rod, crossbar, and push plate, facilitating the pushing, pulling, squeezing, and agitating of plastic particles in the feed cylinder via the push plate. This facilitates the filtration of plastic particles and prevents them from scattering. Furthermore, opening the arc-shaped door allows for easy cleaning of larger plastic particles on the filter screen, thus improving the practicality of the filter assembly.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a filter screen assembly for a plastic blown film machine, comprising a feed cylinder and a pushing mechanism inside it. An arc-shaped door is movably mounted on the front side of the bottom end of the feed cylinder via a hinge. The pushing mechanism includes a drive mechanism and a push plate. An elastic plate is fixedly mounted on one end of the push plate, and a crossbar is fixedly mounted on the inside of the elastic plate corresponding to the other end of the push plate. The drive mechanism includes a fixed plate, a servo motor, an elliptical ring, and a rotating ring. The elliptical ring is rotatably mounted on the outside of the feed cylinder via a fixed ring. The rotating ring is fixedly mounted on the top of the elliptical ring corresponding to the outside of the feed cylinder. An annular groove is formed at the bottom of the elliptical ring. A limiting rod is fixedly mounted on the top of the outer end of the crossbar, and the top of the limiting rod is slidably mounted inside the annular groove. A filter screen is placed inside the bottom end of the feed cylinder corresponding to the inner side of the arc-shaped door.

[0007] Furthermore, the feed cylinder is trumpet-shaped, with the diameter of the top end of the feed cylinder being larger than the diameter of its bottom end, and a fixing mechanism is provided between one end of the arc-shaped door and the feed cylinder.

[0008] Furthermore, the fixing mechanism includes a positioning block and a fixing block. The positioning block is symmetrically fixed on the outer wall of the lower end of the feed cylinder, and the fixing block is fixed on the outer wall of one end of the arc-shaped door. The fixing block and the positioning block have through holes inside, and pins are installed in the through holes.

[0009] Furthermore, the fixing ring is fixedly disposed on the outer wall of the lower end of the feed cylinder, the elliptical ring is rotatably mounted between the top and bottom fixing rings, and a toothed ring is fixedly disposed on the inner wall of the rotating ring.

[0010] Furthermore, the fixing plate is horizontally fixed on the outer wall of the upper end of the feed cylinder, and the servo motor is fixedly installed on the top of the fixing plate.

[0011] Furthermore, a gear is fixedly installed on the output shaft of the servo motor below the fixed plate. The gear meshes with one end of the gear ring and is arranged in parallel. The gear is located on the inner side of the rotating ring.

[0012] Furthermore, the crossbar is symmetrically slidably installed inside the lower end of the feed cylinder, and the middle section of the elastic plate is slidably disposed on the outside of the crossbar.

[0013] Furthermore, a spring is fixedly installed on the inner wall of the middle section of the elastic plate and on the outer side of the corresponding crossbar between the push plate and the push plate. The push plate is movably installed on the top of the filter screen and in contact with the filter screen.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a filter assembly for a plastic blown film machine. Through a servo motor, gears, and a gear ring, the rotating ring and elliptical ring can be adjusted for rotation. The elliptical ring and annular groove allow for lateral movement of the limiting rod. The limiting rod, crossbar, and push plate enable reciprocating lateral movement, facilitating the pushing, pulling, squeezing, and agitating of plastic particles in the feed cylinder via the push plate. This facilitates filtration of the plastic particles and prevents them from scattering. Furthermore, opening the arc-shaped door allows for easy cleaning of larger plastic particles on the filter screen, improving the practicality of the filter assembly. By setting an elastic plate on one side of the push plate and a spring between the elastic plate and the push plate, the plastic particles between the push plate and the inner wall of the feed cylinder are squeezed out when the push plate approaches the inner wall, facilitating the movement of the plastic particles. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a filter screen assembly for a plastic blown film machine according to the present invention;

[0016] Figure 2 This is a structural diagram of the feed cylinder of a filter screen assembly for a plastic blown film machine according to the present invention;

[0017] Figure 3 This is a front cross-sectional view of a filter screen assembly for a plastic blown film machine according to the present invention;

[0018] Figure 4 This utility model relates to a filter screen assembly for a plastic blown film machine. Figure 3 Enlarged view of point A in the middle;

[0019] Figure 5 This is a structural diagram of the elliptical ring and rotating ring of a filter screen assembly for a plastic blown film machine according to the present invention;

[0020] Figure 6 This is a top sectional view of the bottom end of the feed cylinder of a filter screen assembly for a plastic blown film machine according to this utility model;

[0021] Figure 7 This is a structural diagram of the pusher plate of a filter screen assembly for a plastic blown film machine according to the present invention;

[0022] In the diagram: 1. Feed cylinder; 2. Arc-shaped gate; 3. Fixing mechanism; 4. Elliptical ring; 5. Rotating ring; 6. Drive mechanism; 7. Gear ring; 8. Gear; 9. Crossbar; 10. Limiting rod; 11. Push plate; 12. Fixing ring; 13. Annular groove; 14. Filter screen; 15. Fixing plate; 16. Servo motor. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please see Figures 1 to 7 This utility model provides a technical solution: a filter screen assembly for a plastic blown film machine, including a feed cylinder 1 and a pushing mechanism inside it. An arc-shaped door 2 is movably mounted on the front side of the bottom end of the feed cylinder 1 via a hinge. The pushing mechanism includes a drive mechanism 6 and a push plate 11. An elastic plate is fixedly mounted on one end of the push plate 11, and a crossbar 9 is fixedly mounted inside the elastic plate on the other end of the push plate 11. The drive mechanism 6 includes a fixed plate 15, a servo motor 16, an elliptical ring 4, and a rotating ring 5. The elliptical ring 4 is rotatably mounted on the outside of the feed cylinder 1 by a fixed ring 12. The rotating ring 5 is fixedly mounted on the top of the elliptical ring 4 corresponding to the outside of the feed cylinder 1. An annular groove 13 is provided at the bottom of the 4. A limiting rod 10 is fixedly provided at the top of the outer end of the crossbar 9. The top of the limiting rod 10 is slidably installed inside the annular groove 13. A filter screen 14 is placed inside the bottom end of the feed cylinder 1 corresponding to the inner side of the arc-shaped door 2. By rotating and adjusting the arc-shaped door 2, the lower end of the feed cylinder 1 can be opened, which facilitates the discharge of larger plastic particles and the replacement of damaged filter screen 14. The push plate 11 moves back and forth horizontally inside the feed cylinder 1, which facilitates the stirring of plastic particles, thereby filtering the plastic particles and preventing plastic particles from spilling. At the same time, it prevents plastic particles from clogging the filter screen 14 and affecting the filtration of plastic particles.

[0025] In this embodiment, the feed cylinder 1 is trumpet-shaped, with the diameter of its top end being larger than that of its bottom end. A fixing mechanism 3 is provided between one end of the arc-shaped door 2 and the feed cylinder 1. The fixing mechanism 3 includes a positioning block and a fixing block. The positioning block is symmetrically fixed on the outer wall of the lower end of the feed cylinder 1, and the fixing block is fixed on the outer wall of one end of the arc-shaped door 2. The fixing block and the positioning block have through holes inside, and pins are installed in the through holes. By inserting the pins into the through holes inside the fixing block and the positioning block, the fixing block and the positioning block can be fixed, which facilitates the fixing of the arc-shaped door 2 and the subsequent filtration of plastic particles. It also allows for the discharge of larger filtered plastic particles by opening the arc-shaped door 2. The operation is simple and convenient.

[0026] In this embodiment, the fixed ring 12 is fixedly disposed on the outer wall of the lower end of the feed cylinder 1. The elliptical ring 4 is rotatably mounted between the top and bottom fixed rings 12. A toothed ring 7 is fixedly disposed on the inner wall of the rotating ring 5. The fixed plate 15 is horizontally fixedly disposed on the outer wall of the upper end of the feed cylinder 1. The servo motor 16 is fixedly disposed on the top of the fixed plate 15. A gear 8 is fixedly disposed on the output shaft of the servo motor 16 corresponding to the lower part of the fixed plate 15. The gear 8 meshes with one end of the toothed ring 7 and is arranged in parallel. The gear 8 is disposed on the inner side of the rotating ring 5. The servo motor 16 and its matching circuit can drive the gear 8 to rotate. Through the meshing action of the gear 8 and the toothed ring 7, the toothed ring 7 and the rotating ring 5 can be driven to rotate. The rotating ring 5 can drive the elliptical ring 4 to rotate between the fixed rings 12 corresponding to the outer side of the feed cylinder 1, which facilitates the subsequent reciprocating horizontal adjustment of the limiting rod 10 and the push plate 11 through the elliptical ring 4.

[0027] In this embodiment, the crossbar 9 is symmetrically slidably installed inside the lower end of the feed cylinder 1. The middle section of the elastic plate is slidably disposed on the outside of the crossbar 9. A spring is fixedly disposed between the inner wall of the middle section of the elastic plate and the push plate 11 corresponding to the outside of the crossbar 9. The push plate 11 is movably disposed on the top of the filter screen 14 and in close contact with the filter screen 14. Under the limitation of the crossbar 9, the annular groove 13 can squeeze the limiting rod 10, so that the limiting rod 10 can drive the crossbar 9 to slide inside the feed cylinder 1. The limiting rod 10 pushes the push plate 11, which facilitates the stirring of plastic particles by the push plate 11. The elastic plate and spring can squeeze the plastic particles between the push plate 11 and the inner wall of the feed cylinder 1, which facilitates the filtration of plastic particles.

[0028] When using the filter screen assembly of this plastic blown film machine, the assembly is fixedly installed at the top of the feed inlet of the plastic blown film machine by welding, so that the feed cylinder 1 can communicate with the feed inlet of the plastic blown film machine. Rotate and open the arc-shaped door 2 on the front side of the feed cylinder 1, and install the filter screen 14 of the corresponding specification inside the feed cylinder 1 below the corresponding push plate 11, so that the bottom end of the push plate 11 is in close contact with the top of the filter screen 14. Rotate the arc-shaped door 2 in the opposite direction to close the front end of the feed cylinder 1. At the same time, the fixing block moves between the positioning blocks, and the pin is inserted into the through hole to facilitate the fixing of the arc-shaped door 2. The servo motor 16 is controlled by the control switch and the matching circuit of the servo motor 16. The servo motor 16 starts and drives the gear 8 to rotate. Through the meshing of the gear 8 and the gear ring 7, the rotating ring 5 and the elliptical ring 4 rotate synchronously. When the elliptical ring 4 rotates, it can drive the annular groove 13 to squeeze the limit rod 10. With the limit bar 9 in place, the limiting bar 10 can drive the crossbar 9 to move back and forth laterally inside the feed cylinder 1. The crossbar 9 drives the push plate 11 to move back and forth laterally inside the feed cylinder 1. Plastic particles are put in through the upper end of the feed cylinder 1. The push plate 11 can push and pull the plastic particles to stir them. At the same time, when the push plate 11 moves towards the inner wall of the feed cylinder 1, it can drive the elastic plate and spring to squeeze the plastic particles between the push plate 11 and the inner wall of the feed cylinder 1, which facilitates the filtration of plastic particles and prevents plastic particles from scattering. The larger plastic particles at the top of the filter screen 14 are in a moving state to avoid clogging the filter screen 14 and affecting the filtration of plastic particles. After a period of time, the pin is pulled out and the arc-shaped door 2 is opened to facilitate the cleaning of the larger plastic particles on the filter screen 14, which can improve the practicality of the filter screen assembly. The elastic plate is an elastic hard plastic plate with a smooth outer wall. The spring is provided to facilitate the elastic plate to rebound.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A filter screen assembly for a plastic blown film machine, comprising a feed cylinder (1) and a pushing mechanism disposed therein, characterized in that, An arc-shaped door (2) is movably installed on the front side of the bottom end of the feed cylinder (1) via a hinge. The pushing mechanism includes a driving mechanism (6) and a pushing plate (11). An elastic plate is fixedly installed at one end of the pushing plate (11). A crossbar (9) is fixedly installed at the inside of the elastic plate at one end of the pushing plate (11). The driving mechanism (6) includes a fixed plate (15), a servo motor (16), an elliptical ring (4), and a rotating ring (5). The elliptical ring (4) is rotatably installed on the outside of the feed cylinder (1) by a fixed ring (12). The rotating ring (5) is fixedly installed on the top of the elliptical ring (4) on the outside of the feed cylinder (1). An annular groove (13) is opened at the bottom of the elliptical ring (4). A limit rod (10) is fixedly installed at the top of the outer end of the crossbar (9). The top of the limit rod (10) is slidably installed inside the annular groove (13). A filter screen (14) is placed inside the bottom end of the feed cylinder (1) on the inside side of the arc-shaped door (2).

2. The filter screen assembly for a plastic blown film machine according to claim 1, characterized in that: The feed cylinder (1) is horn-shaped, and the diameter of the top end of the feed cylinder (1) is larger than the diameter of the bottom end. A fixing mechanism (3) is provided between one end of the arc-shaped door (2) and the feed cylinder (1).

3. A filter assembly for a plastic blown film machine according to claim 2, characterized in that: The fixing mechanism (3) includes a positioning block and a fixing block. The positioning block is symmetrically fixed on the outer wall of the lower end of the feed cylinder (1), and the fixing block is fixed on the outer wall of one end of the arc-shaped door (2). The fixing block and the positioning block have through holes inside and pins are installed in the through holes.

4. A filter assembly for a plastic blown film machine according to claim 1, characterized in that: The fixed ring (12) is fixedly installed on the outer wall of the lower end of the feed cylinder (1), the elliptical ring (4) is limited to rotate between the fixed ring (12) at the top and bottom, and a toothed ring (7) is fixedly installed on the inner wall of the rotating ring (5).

5. A filter assembly for a plastic blown film machine according to claim 4, characterized in that: The fixing plate (15) is horizontally fixed on the outer wall of the upper end of the feed cylinder (1), and the servo motor (16) is fixedly installed on the top of the fixing plate (15).

6. A filter assembly for a plastic blown film machine according to claim 5, characterized in that: A gear (8) is fixedly installed on the output shaft of the servo motor (16) below the fixed plate (15). The gear (8) meshes with one end of the gear ring (7) and is arranged in parallel. The gear (8) is located inside the rotating ring (5).

7. A filter assembly for a plastic blown film machine according to claim 1, characterized in that: The crossbar (9) is symmetrically slidably installed inside the lower end of the feed cylinder (1), and the middle section of the elastic plate is slidably arranged on the outside of the crossbar (9).

8. A filter assembly for a plastic blown film machine according to claim 7, characterized in that: A spring is fixedly installed on the inner wall of the middle section of the elastic plate and the outer side of the corresponding crossbar (9) between the push plate (11) and the push plate (11). The push plate (11) is movably installed on the top of the filter screen (14) and is in contact with the filter screen (14).

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