Spiral conveying device of film granulator

Abstract

The utility model discloses a spiral conveying device of a film granulator, and belongs to the field of conveying devices. The device mainly comprises a conveying machine shell, a feeding hopper and a heating assembly, the heating assembly comprises a fixed housing installed on the conveying machine shell, and a conveying belt is arranged on the side face of the fixed housing in a penetrating mode; the two groups of drying units comprise cover plates which are hinged to the fixed housing and are oppositely arranged, two groups of fans are arranged on the cover plates in a penetrating manner, and a plurality of groups of heating rods are mounted at one end of the inner wall of the fixed housing; and two groups of crushing blades are mounted in the feeding hopper through bearings. According to the spiral conveying device of the film pelletizer, air is preheated to the specified waste film cracking temperature through the heating rod, hot air is blown into the cavity at a low speed in cooperation with the draught fan, it is ensured that the film is evenly heated, cracked materials slide into the feeding hopper through the opening in the side face of the material receiving cover, shearing force is formed through reverse rotation of the two sets of smashing blades, and the film is uniformly cracked. And through cracking and crushing treatment, the phenomenon of conveying jamming of the spiral conveying device is avoided.

Description

Technical Field

[0001] This utility model relates to the field of conveying device technology, and in particular to a screw conveyor device for a film granulator. Background Technology

[0002] In the field of plastic recycling, film granulators are the core equipment for processing waste plastic films (such as agricultural films, packaging films, etc.) into recycled granules. Their screw conveyor devices play a key role in transporting the pre-treated film materials to the melting and plasticizing unit.

[0003] Waste films contain polar groups (such as hydroxyl and carboxyl groups), resulting in strong hydrophilicity and a tendency to adsorb moisture from the environment, forming an adsorbed water film. Simultaneously, as polymer materials, films exhibit strong intermolecular forces, leading to high viscosity and significant interfacial friction when in contact with metal surfaces. However, traditional conveying devices do not pre-treat the softening point, viscosity, or other thermophysical properties of the film material, making it impossible to reduce viscosity and interfacial friction by altering the film's physical state. When unevenly thick or sheet-like films enter the conveying device, the uneven force generated by the rotating screw easily causes them to fold and curl, eventually becoming entangled on the screw or cavity sidewalls, forming "dead material zones" that affect the continuity and stability of the conveying process. Therefore, a screw conveyor system for film granulation machines needs to be designed.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Utility Model Content

[0005] This utility model provides a spiral conveying device for a film granulator to solve the problem that traditional conveying devices do not pre-treat the film, and that the film with uneven thickness or in sheet form is prone to jamming when it enters the conveying device.

[0006] This utility model embodiment adopts the following technical solution: a screw conveyor device for a film granulator. It mainly includes: a conveyor housing, a feed hopper for feeding material into the conveyor housing, and a heating assembly for pre-treating waste film. The heating assembly includes a fixed cover mounted on the conveyor housing, with a conveyor belt extending through the side of the fixed cover; two drying units, each including a cover plate hinged to the fixed cover and arranged opposite to it, the two cover plates being horizontal, with two sets of fans extending through the cover plates; multiple heating rods installed on one end of the inner wall of the fixed cover; and two sets of pulverizing blades, driven by a power source, installed in the feed hopper to break up the waste film.

[0007] Furthermore, a feeding assembly is installed on the conveyor housing. The feeding assembly includes an overlapping plate installed on the conveyor housing. The overlapping plate has a hollow groove. An opening groove adapted to the hollow groove is opened on the conveyor housing. The feeding hopper is placed on the overlapping plate. A connecting plate is fixedly sleeved on the feeding hopper near the bottom. The side of the feeding hopper near the overlapping plate has a protrusion.

[0008] Furthermore, the feeding assembly is equipped with a fixing unit for fixing the feeding hopper to the conveyor housing. The fixing unit includes a connector installed on the side of the overlapping plate. The connector has a concave structure and has a protruding end. A screw is threadedly connected to the protruding end, and one end of the screw has a pressing part.

[0009] A fixing unit is installed on the overlapping plate. The fixing unit includes a connector installed on the side of the overlapping plate. The connector has a concave structure and a protruding end. A screw is threaded onto the protruding end, and one end of the screw has a pressing part.

[0010] Furthermore, a sealing cover is installed on the side of the fixed cover. The portion of the conveyor belt protruding from the right side of the fixed cover is defined as the first protruding section, and the portion of the conveyor belt protruding from the left side of the fixed cover is defined as the second protruding section. The second protruding section is located on the upper side of the feed hopper, and a feed part is connected to the sealing cover.

[0011] Furthermore, a turntable is fixedly installed at one end of the screw.

[0012] Furthermore, the portion of the conveyor belt protruding from the right side of the fixed cover is defined as the first protruding section, and the portion of the conveyor belt protruding from the left side of the fixed cover is defined as the second protruding section. The second protruding section is located on the upper side of the feed hopper, and a feed section is connected to the sealing cover.

[0013] Furthermore, a dust cover is fitted onto the heating rod, and a temperature sensor is installed inside the fixed cover.

[0014] Furthermore, there is a gap between the two sets of crushing blades, and two sets of asynchronous motors are installed on the side of the feed hopper, the asynchronous motors passing through the feed hopper and connected to the crushing blades.

[0015] Furthermore, a receiving cover is fitted to the left side of the fixed cover, the side of the receiving cover near the fixed cover is open, and the bottom surface of the receiving cover is connected to the upper surface of the feed hopper.

[0016] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:

[0017] The screw conveyor of the film granulator transports waste film via a conveyor belt. A heating rod inside the fixed housing preheats the air to the specified temperature for the waste film to pyrolyze. A fan blows hot air into the cavity at low speed to ensure uniform heating of the film. The pyrolyzed material slides into the feed hopper through the side opening of the receiving hood and is crushed by two sets of counter-rotating crushing blades that generate shear force. Through pyrolysis and crushing, the screw conveyor avoids jamming during transport. Attached Figure Description

[0018] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0019] In the attached diagram:

[0020] Figure 1 This is an overall schematic diagram of the screw conveyor device of the film granulator in this application;

[0021] Figure 2 for Figure 1 A partial disassembly diagram;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0023] Figure 4 for Figure 2 Enlarged view of point B in the image;

[0024] Figure label:

[0025] 1. Conveying assembly; 11. Conveyor housing; 12. Drive unit; 13. Feed hopper; 2. Feeding assembly; 21. Overlap plate; 22. Feed hopper; 23. Connecting plate; 24. Crushing blade; 25. Connecting component; 26. Screw; 27. Turntable; 3. Heating assembly; 31. Fixed cover; 32. Conveyor belt; 33. Sealing cover; 34. Feeding section; 35. Drying unit; 351. Cover plate; 352. Fan; 353. Handle; 354. Heating rod; 355. Dust cover; 38. Receiving cover. Detailed Implementation

[0026] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0027] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0028] Reference Figures 1 to 4As shown, this utility model embodiment provides a screw conveyor device for a film granulator, which mainly includes a conveying component 1, a feeding component 2, and a heating component 3;

[0029] The conveying assembly 1 includes a conveyor housing 11 that provides a conveying and storage space for waste film. The bottom of the conveyor housing 11 has a bracket (not shown in the figure) for supporting the conveyor housing 11. A drive unit 12 is fixedly installed at one end of the conveyor housing 11. The drive unit 12 can be a motor. The output end of the drive unit 12 passes through one end of the conveyor housing 11 and extends into its interior. A spiral blade (not shown in the figure) is fixedly installed at the output end of the drive unit 12. The spiral blade is located inside the conveyor housing 11.

[0030] Meanwhile, a feeding hopper 13 is connected and installed at the bottom of the conveyor housing 11. The feeding hopper 13 is suitable for feeding the conveyed waste film.

[0031] When the drive unit 12 (motor) is powered on, it starts to operate, driving the spiral blade to rotate through the output end of the drive unit 12. The waste film enters the conveyor housing 11 from a suitable feeding position, and the rotating spiral blade contacts the waste film inside the conveyor housing 11. The structural characteristics of the spiral blade cause it to generate an axial thrust on the waste film when rotating. Under this thrust, combined with the friction between the waste film and the inner wall of the conveyor housing 11 and its own weight, the waste film moves forward inside the conveyor housing 11 along the spiral direction of the spiral blade. During this process, the spiral blade continues to rotate, constantly pushing the waste film towards the discharge direction of the conveyor housing 11. As the spiral blade continues to push, the waste film gradually moves to the discharge hopper 13 connected to the bottom end of the conveyor housing 11.

[0032] And a feeding assembly 2 is installed on the conveyor housing 11. The feeding assembly 2 includes an overlapping plate 21 fixedly installed on the conveyor housing 11. The overlapping plate 21 has a hollow groove, and an opening groove (not shown in the figure) adapted to the hollow groove is provided on the conveyor housing 11. The opening groove is suitable for feeding waste film into the conveyor housing 11.

[0033] Furthermore, a feeding hopper 22 is placed on the overlapping plate 21, and a mating plate 23 is fixedly sleeved on the feeding hopper 22 near the bottom. At the same time, the feeding hopper 22 has a protrusion on the side near the overlapping plate 21. The feeding hopper 22 is adapted to be inserted into the hollow groove of the overlapping plate 21 through the protrusion to complete the initial docking of the feeding hopper 22 and the overlapping plate 21. It should be noted that when the feeding hopper 22 extends into the hollow groove through the protrusion, the mating plate 23 gradually comes into contact with the upper surface of the overlapping plate 21.

[0034] Two sets of fixing units are installed on both sides of the overlapping plate 21. The fixing unit is adapted to fix the feed hopper 22 on the overlapping plate 21. The fixing unit includes a connector 25 fixedly installed on the side of the overlapping plate 21. The connector 25 has a concave structure and has an extended end (not shown in the figure). A screw 26 is threadedly connected to the extended end. One end of the screw 26 has a pressing part (not shown in the figure). The pressing part is adapted to move closer to or away from the upper surface of the mating plate 23 as the screw 26 rotates, so as to press the feed hopper 22 tightly on the overlapping plate 21.

[0035] Meanwhile, a turntable 27 is fixedly installed at one end of the screw 26, which is suitable for applying torque to the screw 26;

[0036] Before the fixing operation, the feed hopper 22 is inserted into the hollow groove of the overlapping plate 21 through its protrusion to achieve initial docking. At this time, the docking plate 23 is in contact with the upper surface of the overlapping plate 21, preparing for the subsequent fixing steps;

[0037] The operator holds the turntable 27 and applies torque to it, causing the screw 26 to rotate. Since the screw 26 and the protruding end of the connector 25 are connected by a thread, according to the principle of threaded transmission, the rotation of the screw 26 will cause it to move linearly along the thread direction. As the screw 26 rotates, the pressing part at one end gradually approaches the upper surface of the mating plate 23. When the pressing part contacts the mating plate 23, the turntable 27 continues to rotate, and the pressing part applies pressure to the mating plate 23. Since the mating plate 23 is fixedly fitted onto the feed hopper 22, this is equivalent to tightly pressing the feed hopper 22 onto the overlapping plate 21. The two sets of fixing units apply pressure to the feed hopper 22 from both sides of the overlapping plate 21, forming a stable connection between the feed hopper 22 and the overlapping plate 21.

[0038] When the feed hopper 22 needs to be disassembled, cleaned, or maintained, the operator rotates the turntable 27 in the opposite direction, causing the screw 26 to rotate in the opposite direction. At this time, the screw 26 moves in the opposite direction along the thread direction, and the holding part gradually moves away from the mating plate 23 until the pressure on the mating plate 23 is completely released. In this way, the fixed state between the feed hopper 22 and the overlapping plate 21 is released, and the feed hopper 22 can be removed from the overlapping plate 21.

[0039] Furthermore, a heating assembly 3 for pre-treating waste film is installed on the conveyor housing 11. The heating assembly 3 includes a fixed cover 31 fixedly installed on the conveyor housing 11. The fixed cover 31 is provided through the side, and a conveyor belt 32 is provided through the side of the fixed cover 31. The conveyor belt 32 is used to transport the waste film into the feed hopper 22.

[0040] Furthermore, a sealing cover 33 is fixedly installed on the side of the fixed cover 31, at which point... Figure 2Based on this, the portion of the conveyor belt 32 protruding from the right side of the fixed cover 31 is defined as the first protruding section, and the portion of the conveyor belt 32 protruding from the left side of the fixed cover 31 is defined as the second protruding section. The second protruding section is located on one side of the upper end of the feed hopper 22. The sealing cover 33 is used to cover the first protruding section, and a feeding part 34 is connected and installed on the sealing cover 33. The feeding part 34 is suitable for feeding waste film so that the waste film can be transported into the feed hopper 22 by the conveyor belt 32.

[0041] Two drying units 35 are hinged to the fixed housing 31. The two drying units 35 include cover plates 351 that are hinged to the fixed housing 31 and arranged opposite to each other. In the default state, the two cover plates 351 are horizontal. Two fans 352 are installed through the cover plates 351. The fans 352 are adapted to blow air into the fixed housing 31. At the same time, multiple heating rods 354 are fixedly installed at one end of the inner wall of the fixed housing 31, and dust covers 355 are sleeved on the heating rods 354. At the same time, a temperature sensor (not shown in the figure) is installed inside the fixed housing 31 to detect the temperature inside the fixed housing 31.

[0042] Two sets of crushing blades 24 are installed in the bearing inside the feed hopper 22. There is a gap between the two sets of crushing blades 24, which allows the crushed waste film to pass through. Two sets of asynchronous motors (not shown in the figure) are fixedly installed on the side of the feed hopper 22. The asynchronous motors are adapted to drive the crushing blades 24 to rotate in order to crush the waste film. At the same time, the rotation directions of the two sets of crushing blades 24 are set in opposite directions.

[0043] A receiving cover 38 is attached to the left side of the fixed cover 31. The side of the receiving cover 38 near the fixed cover 31 is open, and the bottom surface of the receiving cover 38 is connected to the upper surface of the feed hopper 22. The receiving cover 38 is suitable for conveying the waste film conveyed by the conveyor belt 32 into the feed hopper 22.

[0044] It should be noted that there is a certain gap between the two sets of cover plates 351. At the same time, in the default state, the two sets of cover plates 351 with their adjacent sides are provided with sealing strips. The sealing strips are made of flexible material, so that there will be no interference when the two sets of cover plates 351 are opened or closed.

[0045] In this application, a PLC control system is provided on the fixed cover 31, which is used to control the movement of the aforementioned drive equipment.

[0046] by Figure 2 Based on this, the device has a horizontal linear layout, and the material flow direction is as follows:

[0047] Feed section 34 (right side) → Sealing cover 33 (first protruding section) → Fixed cover 31 (cracking core area) → Receiving cover 38 → Feed hopper 22 (crushing zone) → Conveyor housing 11 (screw conveyor) → Discharge hopper 13 (discharge);

[0048] Waste film is fed into the feed section 34 and falls into the first protruding section (right side) of the conveyor belt 32, and is conveyed to the left. The heating rod 354 in the fixed cover 31 preheats the air to the specified temperature for the waste film to decompose. The fan 352 blows hot air into the cavity at low speed to ensure that the film is heated evenly. The temperature sensor monitors the temperature inside the cavity in real time. The PLC system dynamically adjusts the power of the heating rod 354 according to the set value.

[0049] The pyrolyzed material slides into the feed hopper 22 through the side opening of the receiving hood 38. The two sets of crushing blades 24 are driven by an asynchronous motor and rotate in opposite directions to generate shearing force to crush the material. At the same time, an elastic sealing strip (made of silicone rubber) is provided at the connection between the receiving hood 38 and the feed hopper 22.

[0050] A handle 353 is fixedly installed on the cover plate 351. The handle 353 is made of arc-shaped engineering plastic and is suitable for rotating the cover plate 351 along the hinge with the sealing cover 33 so that the top of the sealing cover 33 is in the open or closed state. This allows the fan 352 to be disassembled and cleaned indirectly, so as to avoid cleaning the fan 352 directly in the default state, where dust on the fan 352 will fall into the sealing cover 33.

[0051] After the cover plate 351 is flipped to a vertical position by the handle 353, the fan 352 is removed from the internal space of the sealing cover 33. The dust generated during the cleaning process falls directly to the ground (a dust collection tray needs to be laid below), avoiding the path of contaminant materials. At the same time, regular cleaning of the fan 352 can ensure stable air volume, avoid the decrease in efficiency of the fan 352 due to dust accumulation, and maintain the heat exchange efficiency of the drying section.

[0052] In summary, the screw conveyor of the film granulator integrates conveying, feeding, and heating components 3, realizing the entire process of waste film processing from feeding to unloading. Its working principle is as follows:

[0053] The operator first inserts the feed hopper 22 into the hollow groove of the overlapping plate 21 through the protrusion to complete the initial docking. Then, the turntable 27 is rotated to make the screw 26 rotate, so that the pressing part presses the docking plate 23, thereby fixing the feed hopper 22 onto the overlapping plate 21. After that, the waste film is fed from the feed section 34 and falls into the first protruding section of the conveyor belt 32, and is conveyed to the left by the conveyor belt 32.

[0054] After the waste film enters the sealing cover 33 and the fixed cover 31, the heating rod 354 inside the fixed cover 31 heats the air to the temperature required for the waste film to decompose. The fan 352 blows hot air into the cavity to form turbulence, ensuring that the film is heated evenly. The temperature sensor monitors the temperature inside the cavity in real time, and the PLC control system dynamically adjusts the power of the heating rod 354 according to the set value, so that the waste film can complete the decomposition inside the fixed cover 31.

[0055] The pyrolyzed material slides into the feed hopper 22 through the side opening of the receiving hood 38. The two sets of crushing blades 24 inside the feed hopper 22 are driven by an asynchronous motor to rotate in opposite directions, forming a shearing force to crush the material. At the same time, the elastic sealing strip at the connection between the receiving hood 38 and the feed hopper 22 can prevent hot air from escaping.

[0056] The crushed waste film enters the conveyor housing 11 from the feed hopper 22 through the hollow groove of the overlapping plate 21 and the opening groove of the conveyor housing 11. The drive unit 12 drives the spiral blade to rotate, and the spiral blade generates an axial thrust on the waste film. Under the action of the thrust, the friction between the waste film and the inner wall of the conveyor housing 11, and its own gravity, the waste film moves forward along the spiral direction inside the conveyor housing 11 and is finally discharged from the discharge hopper 13.

[0057] When cleaning and maintenance of the blower 352 is required, the operator can hold the handle 353 and flip the cover plate 351 to a vertical position, so that the blower 352 is removed from the internal space of the sealing cover 33. In this way, the dust generated during cleaning will fall directly into the dust collection tray on the ground, avoiding the path of contaminating the material, and ensuring the stable air volume of the blower 352, maintaining the heat exchange efficiency of the drying section. When the feed hopper 22 needs to be disassembled, cleaned, or maintained, the turntable 27 is rotated in the opposite direction to release the pressure of the screw 26 holding part on the docking plate 23, and the feed hopper 22 can be removed.

[0058] This avoids the problem that when films of uneven thickness or in sheet form enter the conveying device, they are prone to folding and curling due to uneven force under the mechanical force generated by the rotation of the screw shaft, and then become entangled on the screw shaft or the side wall of the cavity, forming a "dead material zone" where materials are stuck, which will affect the continuity and stability of the conveying.

[0059] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A spiral conveying device of a film pelletizer, comprising a conveyor housing (11), a feeding hopper (22) for feeding materials into the conveyor housing (11), and a heating assembly (3) for pretreating waste film, characterized in that: The heating assembly (3) comprises a fixed cover (31) installed on the conveyor shell (11), and a conveying belt (32) is arranged through the side of the fixed cover (31); Two groups of drying units (35) are arranged, the drying unit (35) comprises a cover plate (351) hinged to the fixed cover (31) and arranged oppositely, the two groups of cover plates (351) are in a horizontal state, two groups of fans (352) are arranged through the cover plate (351), and a plurality of heating rods (354) are installed at one end of the inner wall of the fixed cover (31); The inner shaft of the feeding hopper (22) is bearing-mounted and driven by power, and two groups of crushing blades (24) are arranged to crush the waste film.

2. The spiral conveyor of claim 1, wherein: The conveyor shell (11) is provided with a feeding assembly (2), the feeding assembly (2) comprises a lap plate (21) installed on the conveyor shell (11), the lap plate (21) has a hollow groove, the conveyor shell (11) is provided with an open groove matched with the hollow groove, the feeding hopper (22) is arranged on the lap plate (21), a butt plate (23) is fixedly sleeved on the feeding hopper (22) close to the bottom, and one side of the feeding hopper (22) close to the lap plate (21) has a protruding portion. The lap plate (21) is provided with a fixing unit, the fixing unit comprises a connecting piece (25) installed on the side of the lap plate (21), the connecting piece (25) is concave, the connecting piece (25) has an extending end, a screw rod (26) is threadedly connected to the extending end, and the screw rod (26) has a pressing portion at one end.

3. The spiral conveyor of claim 1, wherein: A sealing cover (33) is installed on the side of the fixed cover (31), a part of the conveying belt (32) protruding to the right side of the fixed cover (31) is defined as a first protruding section, and a part of the conveying belt (32) protruding to the left side of the fixed cover (31) is defined as a second protruding section, the second protruding section is located at one side of the upper end of the feeding hopper (22), and a feeding portion (34) is installed in communication on the sealing cover (33).

4. The spiral conveyor of claim 2, wherein: One end of the screw rod (26) is fixedly provided with a rotating disc (27).

5. The spiral conveyor of claim 3, wherein: A part of the conveying belt (32) protruding to the right side of the fixed cover (31) is defined as a first protruding section, a part of the conveying belt (32) protruding to the left side of the fixed cover (31) is defined as a second protruding section, the second protruding section is located at one side of the upper end of the feeding hopper (22), and a feeding portion (34) is installed in communication on the sealing cover (33).

6. The spiral conveyor of claim 1, wherein: A dust cover (355) is sleeved on the heating rod (354), and a temperature sensor is installed in the fixed cover (31).

7. The spiral conveyor of claim 1, wherein: There is a gap between the two groups of crushing blades (24), two groups of asynchronous motors are installed on the side of the feeding hopper (22), and the asynchronous motors penetrate the feeding hopper (22) and are connected with the crushing blades (24).

8. The spiral conveyor of claim 5, wherein: A material receiving cover (38) is arranged on the left side of the fixed cover (31), one side of the material receiving cover (38) close to the fixed cover (31) is provided with an opening, and the bottom surface of the material receiving cover (38) is connected with the upper surface of the feeding hopper (22).

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