Extrusion melting device of film blowing machine

Abstract

The utility model relates to the technical field of extrusion equipment of film blowing machines, and discloses an extrusion melting device of a film blowing machine, which comprises a screw-type extruder body, the left end of the upper surface of the screw-type extruder body is fixedly connected with a feed hopper communicated with the inside of the screw-type extruder body, and two crushing mechanisms are symmetrically arranged in the feed hopper. A sieve plate is fixedly connected to the position, located below the two crushing mechanisms, in the feeding hopper; a strip-shaped hole is formed in the right side surface of the feeding hopper, and a recycling mechanism is arranged at the position, below the strip-shaped hole, of the right side surface of the feeding hopper. According to the utility model, the recycling mechanism is arranged, materials naturally slide rightwards under the action of gravity through the inclined sieve plate, particles conforming to specifications quickly pass through the sieve plate, and larger particles are guided to the recycling box for temporary storage along the strip-shaped hole and the hollow bent plate after being intercepted; and the large-particle materials are mixed with newly added materials through the suction effect of a centrifugal fan in the secondary screening mechanism and then enter the crushing mechanism again for secondary crushing.

Description

Technical Field

[0001] This utility model relates to the technical field of blown film extrusion equipment, specifically a blown film extrusion melting device. Background Technology

[0002] In the plastic film production process, the extrusion melting device is a key component of the blown film machine, and its performance directly affects the film forming quality, production efficiency and energy consumption.

[0003] In order to improve melting efficiency, most existing plastic extruders crush the raw materials. However, due to the different sizes of the crushed raw materials, some larger particles can still affect the melting efficiency, leading to the accumulation of raw materials and thus affecting the quality of the product.

[0004] Chinese patent discloses a plastic extruder that facilitates raw material melting (authorization announcement number CN221584187U). In this patented technology, the crushed raw material falls onto a filter screen for screening. Large particles of raw material fall onto the filter screen, while small particles fall onto the melting plate inside the melting box after passing through the filter screen. To prevent the filter screen from clogging, a second motor can be started to drive the second connecting rod at the output end to rotate, causing the cam to rotate and contact the semicircular block, which moves the vertical rod upward. The spring is stretched, lifting the sliding frame and the filter screen. When the cam is not in contact with the semicircular block, the tension of the spring can cause the sliding frame to quickly return to its original position, causing it to vibrate, thereby preventing the filter screen from clogging.

[0005] However, it has certain drawbacks:

[0006] Vibration only delays clogging and cannot actively remove particles. Although the vibration driven by the cam and spring (second motor, second connecting rod, sliding frame, etc.) can loosen large particles on the filter screen surface for a short time, large particles that are not screened still remain on the filter screen (equivalent to sieve plate 8). As time goes by, the particles that are not discharged continue to accumulate. Vibration only makes minor adjustments to their positions and cannot completely remove them. Eventually, local accumulation will still form, reducing the effective screening area of ​​the filter screen and affecting the efficiency of small particle passage. Utility Model Content

[0007] The purpose of this invention is to provide an extrusion melting device for a blown film machine to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] An extrusion melting device for a blown film machine includes a screw extruder body and an extrusion die fixed to the right end of the screw extruder body. Multiple heating plates are embedded and fixed to the inner surface of the screw extruder body, and a feed hopper communicating with the inside of the screw extruder body is fixed to the left end of the upper surface of the screw extruder body. Two crushing mechanisms are symmetrically arranged inside the feed hopper, and a screen plate is fixedly connected to the feed hopper below the two crushing mechanisms.

[0010] The right end of the sieve plate is inclined downward. A strip-shaped hole is opened on the right side surface of the feed hopper, and a recycling mechanism is set on the right side surface of the feed hopper below the strip-shaped hole. The recycling mechanism includes a support plate, a recycling box is fixedly connected to the upper surface of the support plate, a hollow curved plate communicating with the inside of the recycling box is fixedly connected to the upper surface of the recycling box, and a re-screening mechanism is set on the right side of the upper surface of the support plate.

[0011] As a further embodiment of this utility model: the crushing mechanism includes a motor, and a crushing roller is fixedly connected to the output end of the motor.

[0012] As a further embodiment of this utility model: the double screening mechanism includes a centrifugal fan, with a pipe fixedly connected to the air inlet end of the centrifugal fan and a pipe fixedly connected to the air outlet end of the centrifugal fan.

[0013] As a further embodiment of this utility model: the left end of the support plate is fixed to the right side surface of the feed hopper, and the support plate is located below the strip hole; the upper end of the hollow curved plate is attached to the right side surface of the feed hopper, and the upper end of the hollow curved plate is directly opposite the strip hole.

[0014] As a further embodiment of this utility model: the motor is fixed to the left side surface of the feed hopper, the right end of the crushing roller is rotatably connected to the inner right side surface of the feed hopper, and the strip hole is flush with the right end of the upper surface of the sieve plate.

[0015] As a further embodiment of this utility model: the centrifugal fan is fixed to the upper surface of the support plate, the left end of the first pipe is fixed to the right side surface of the recycling box, and the first pipe is connected to the interior of the recycling box, and the upper end of the second pipe is located above the feed hopper.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This utility model has a recycling mechanism. With the inclined screen plate, the material naturally slides to the right under the action of gravity. Particles that meet the specifications pass through the screen plate quickly, while larger particles are intercepted and guided to the recycling box for temporary storage along the strip holes and hollow curved plates. This design not only achieves accurate screening, but also avoids the clogging problem caused by the large accumulation of large particles in traditional screen plates through dynamic material discharge.

[0018] 2. This utility model has a double screening mechanism. Large particles are drawn in through pipe one by the centrifugal fan in the double screening mechanism and then blown back to the top of the feed hopper through pipe two. After being mixed with the new material, they enter the crushing mechanism again for secondary crushing. This closed-loop system realizes the automatic recycling and repeated processing of large particles, significantly improves the utilization rate of raw materials and reduces manual intervention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an extrusion melting device for a blown film machine;

[0020] Figure 2 This is a partial cross-sectional view of an extrusion melting device for a blown film machine;

[0021] Figure 3 This is a schematic diagram of the recycling mechanism in the extrusion melting device of a blown film machine;

[0022] Figure 4 This is a schematic diagram of the screening mechanism in the extrusion melting device of a blown film machine.

[0023] In the diagram: 1. Screw extruder body; 2. Extrusion die; 3. Heating plate; 4. Feed hopper; 5. Crushing mechanism; 6. Motor; 7. Crushing roller; 8. Screen plate; 9. Slotted hole; 10. Recycling mechanism; 11. Support plate; 12. Recycling box; 13. Hollow curved plate; 14. Re-screening mechanism; 15. Centrifugal fan; 16. Pipeline 1; 17. Pipeline 2. Detailed Implementation

[0024] Please see Figure 1 and Figure 2 In this embodiment of the present invention, a blown film extrusion melting device includes a screw extruder body 1 and an extrusion die 2 fixed to the right end of the screw extruder body 1. Multiple heating plates 3 are embedded and fixed to the inner surface of the screw extruder body 1, and a feed hopper 4 communicating with the inside of the screw extruder body 1 is fixed to the left end of the upper surface of the screw extruder body 1. Two crushing mechanisms 5 are symmetrically arranged inside the feed hopper 4. The crushing mechanism 5 includes a motor 6, which is fixed to the left side surface of the feed hopper 4. A crushing roller 7 is fixed to the output end of the motor 6. The right end of the crushing roller 7 is rotatably connected to the right side surface of the inside of the feed hopper 4. A screen plate 8 is fixedly connected to the inside of the feed hopper 4 below the two crushing mechanisms 5.

[0025] The material extruded through the extrusion die 2 directly enters the blown film machine;

[0026] Heating plate 3 is an electric heating plate, which includes a heat-conducting plate and heating wires embedded inside the heat-conducting plate; heating plate 3 is flush with the inner surface of the screw extruder body 1;

[0027] Looking from left to right, the left motor 6 drives the crushing roller 7 to rotate clockwise, and the right motor 6 drives the crushing roller 7 to rotate counterclockwise, which is used to crush materials.

[0028] The sieve plate 8 is used to screen materials, allowing materials that meet the specifications to pass through while blocking larger particles.

[0029] exist Figures 1-3 In the middle: the right end of the sieve plate 8 is inclined downward, and the right side surface of the feed hopper 4 is provided with a strip hole 9. The strip hole 9 is flush with the right end of the upper surface of the sieve plate 8. The right side surface of the feed hopper 4 is provided with a recycling mechanism 10 below the strip hole 9. The recycling mechanism 10 includes a support plate 11. The left end of the support plate 11 is fixed to the right side surface of the feed hopper 4, and the support plate 11 is located below the strip hole 9. The upper surface of the support plate 11 is fixed with a recycling box 12. The upper surface of the recycling box 12 is fixed with a hollow curved plate 13 that communicates with the inside of the recycling box 12. The upper end of the hollow curved plate 13 is attached to the right side surface of the feed hopper 4, and the upper end of the hollow curved plate 13 is directly opposite the strip hole 9.

[0030] The inclination angle of the sieve plate 8 is 15°-45°, which allows the material to be displaced to the right at an appropriate speed.

[0031] Larger particles can be discharged into the recycling bin 12 through the strip hole 9 and the hollow curved plate 13 for recycling, thus preventing large particles from accumulating on the surface of the screen plate 8 and causing blockage of the screen plate 8, which would prevent materials that meet the specifications from passing through normally.

[0032] exist Figures 2-4 In the middle: A screening mechanism 14 is provided on the upper surface of the support plate 11 on the right side of the recycling box 12. The screening mechanism 14 includes a centrifugal fan 15. The centrifugal fan 15 is fixed to the upper surface of the support plate 11. The air inlet end of the centrifugal fan 15 is fixed to a pipe 16. The left end of the pipe 16 is fixed to the right side of the recycling box 12 and the pipe 16 is connected to the inside of the recycling box 12. The air outlet end of the centrifugal fan 15 is fixed to a pipe 2 17. The upper end of the pipe 2 17 is located above the feed hopper 4.

[0033] Centrifugal fan 15 is a commonly used conveying equipment in industry. It belongs to the category of industrial-grade centrifugal fans (refer to GB / T3235-2008 "Technical Conditions for Centrifugal Fans"). It uses mechanical seals or labyrinth seals between the motor and the impeller cavity to ensure that foreign objects cannot enter the motor cavity in reverse when rotating at high speed. Therefore, no damage or other problems will occur when sucking up foreign objects.

[0034] The centrifugal fan 15 has adjustable power to adjust the appropriate suction force;

[0035] Centrifugal fan 15 is used to discharge the material in recycling box 12 back into feed hopper 4 for further crushing to meet usage requirements.

[0036] The working principle of this utility model is as follows: After the material is fed into the hopper 4, it is crushed by two symmetrically arranged crushing mechanisms 5: the left motor 6 drives the crushing roller 7 to rotate clockwise, and the right motor 6 drives the crushing roller 7 to rotate counterclockwise, forming a shearing crushing effect; the crushed material falls onto the screen plate 8 for screening, and the material that meets the specifications falls into the screw extruder body 1, is heated and melted by the internal heating plate 3, and is extruded through the extrusion die 2; larger particles blocked by the screen plate 8 slide along the inclined surface to the strip hole 9, and enter the recovery box 12 for temporary storage through the hollow curved plate 13; at this time, the centrifugal fan 15 of the re-screening mechanism 14 sucks the material in the recovery box 12 through the first pipe 16, and blows it back to the top of the hopper 4 through the second pipe 17 for secondary crushing; finally, the molten material is continuously and stably transported to the blown film machine through the extrusion die 2.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A blown film extrusion melting device, comprising a screw extruder body (1) and an extrusion die (2) fixed to the right end of the screw extruder body (1), wherein a plurality of heating plates (3) are embedded and fixed to the inner surface of the screw extruder body (1), and a feed hopper (4) communicating with the inside of the screw extruder body (1) is fixed to the left end of the upper surface of the screw extruder body (1), wherein two crushing mechanisms (5) are symmetrically arranged inside the feed hopper (4), and a screen plate (8) is fixedly connected to the two crushing mechanisms (5) below the feed hopper (4); Its features are, The right end of the sieve plate (8) is inclined downward. A strip hole (9) is opened on the right side surface of the feed hopper (4). A recycling mechanism (10) is provided on the right side surface of the feed hopper (4) below the strip hole (9). The recycling mechanism (10) includes a support plate (11). A recycling box (12) is fixedly connected to the upper surface of the support plate (11). A hollow curved plate (13) communicating with the inside of the recycling box (12) is fixedly connected to the upper surface of the recycling box (12). A double screening mechanism (14) is provided on the right side of the upper surface of the support plate (11) at the recycling box (12).

2. The blown film extrusion melting device according to claim 1, characterized in that, The crushing mechanism (5) includes a motor (6), and a crushing roller (7) is fixedly connected to the output end of the motor (6).

3. The blown film extrusion melting device according to claim 1, characterized in that, The screening mechanism (14) includes a centrifugal fan (15), with a pipe (16) fixedly connected to the air inlet end of the centrifugal fan (15) and a pipe (17) fixedly connected to the air outlet end of the centrifugal fan (15).

4. The blown film extrusion melting device according to claim 1, characterized in that, The left end of the support plate (11) is fixed to the right side surface of the feed hopper (4), and the support plate (11) is located below the strip hole (9). The upper end of the hollow curved plate (13) is attached to the right side surface of the feed hopper (4), and the upper end of the hollow curved plate (13) is directly opposite the strip hole (9).

5. The blown film extrusion melting device according to claim 2, characterized in that, The motor (6) is fixed to the left side surface of the feed hopper (4), the right end of the crushing roller (7) is rotatably connected to the inside right side surface of the feed hopper (4), and the strip hole (9) is flush with the right end of the upper surface of the sieve plate (8).

6. The blown film extrusion melting device according to claim 3, characterized in that, The centrifugal fan (15) is fixed to the upper surface of the support plate (11), the left end of the first pipe (16) is fixed to the right side surface of the recycling box (12), and the first pipe (16) is connected to the inside of the recycling box (12). The upper end of the second pipe (17) is located above the feed hopper (4).

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