Raw material screening device for degradable plastic film bag processing

Abstract

The utility model discloses a raw material screening device for degradable plastic film bag processing, and relates to the technical field of degradable plastic film bag processing, the raw material screening device comprises a box body, a first fixing ring, a second fixing ring and a third fixing ring are uniformly and fixedly installed in the middle of the box body, and screening nets are fixedly installed in the middle of the first fixing ring, the middle of the second fixing ring and the middle of the third fixing ring. According to the multi-layer screening device, during screening, raw materials can be guided into the box body through the material guiding pipe, firstly fall into the screening net in the middle of the first fixing ring and are sequentially screened downwards, meshes of each layer of screening net are gradually reduced so that the raw materials can be subjected to multi-layer screening, air can be blown into the corresponding cavity through the ventilation pipe in the mode of externally connecting a pipeline in the process, and the screening efficiency is improved. And the frequency is controlled through the air valve, and the motor capable of driving the rotating shaft and the scraping plate on the side face to rotate is matched, so that large particles blocked in meshes and plastic particles stacked together can be scattered and stirred to be always kept in a motion state, the screening efficiency can be greatly improved, and the screening net is prevented from being blocked.

Description

Technical Field

[0001] This utility model relates to the field of biodegradable plastic film bag processing technology, and in particular to a raw material screening device for biodegradable plastic film bag processing. Background Technology

[0002] Biodegradable plastic film bags are plastic products that can be decomposed by microorganisms in nature under specific conditions. There are many types of raw materials for biodegradable plastic film bags, including but not limited to polylactic acid, poly(3-hydroxyalkanoate) PHA, poly(ε-caprolactone) PCL, PBS / PBSA, aliphatic and aromatic copolyesters, etc. The raw materials can be selected according to different plastic film bags. They are usually granular, and the melting and flowability of the raw material particles are different. In order to improve the specificity, they are often classified according to the size of the raw material particles.

[0003] In the prior art, Chinese utility model patent CN217494845U discloses a screening device for biodegradable plastic raw materials. The bottom of the screening frame is provided with a supporting base, and a collection box is provided inside the supporting base. The screening frame is provided with three insertion slots, and each of the three insertion slots is equipped with an insertion inner frame. A primary screen, a secondary screen, and a tertiary screen are respectively provided inside the three insertion inner frames. A closed bottom plate is provided below each of the primary, secondary, and tertiary screens. An outer edge seat is provided on one side of the outer wall of the screening frame, and a processing chamber is provided at the upper end of the outer edge seat. Two crushing rollers are provided inside the processing chamber. Crushing teeth are provided on the outer walls of the two crushing rollers, and the crushing teeth on the two crushing rollers are arranged alternately and correspondingly.

[0004] In existing technology, the aforementioned device uses multiple layers of screens with progressively smaller mesh sizes. Larger plastic raw material particles that cannot pass through the first-stage screen are considered incompletely screened. This incompletely screened product is then poured into a processing chamber and crushed by two crushing rollers. Larger particles fall into a receiving drawer, and the crushed material is then placed into a screening frame for secondary screening, thus achieving complete screening of biodegradable plastic raw materials. However, certain problems exist in practical use. First, the screens are stationary. When raw materials are introduced onto each stage of the screen, larger particles may directly clog the mesh, preventing smaller particles from entering the next stage and hindering efficient screening. Second, some qualified raw materials may be clogged by unqualified materials, requiring secondary processing, resulting in resource waste and further reducing the screening efficiency for biodegradable plastic film bags. Utility Model Content

[0005] The purpose of this invention is to address the problems in existing technologies where some devices have stationary screens. When raw materials are introduced onto each screen, larger particles may directly clog the screen openings, preventing smaller materials from entering the next screen and hindering efficient material screening. Furthermore, some qualified materials may require secondary processing due to blockage by unqualified materials, leading to resource waste and further reducing screening efficiency. Therefore, this invention proposes a raw material screening device for biodegradable plastic film bag processing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a raw material screening device for processing biodegradable plastic film bags, comprising a box body, wherein a fixing ring one, a fixing ring two, and a fixing ring three are uniformly fixedly installed in the middle of the box body, and a screening screen is fixedly installed in the middle of each of the fixing ring one, fixing ring two, and fixing ring three. The filter holes of the multiple screening screens are arranged from top to bottom and gradually decrease in size. Multiple cavities are formed between the multiple screening screens and the box body. A rotating groove is opened on the outer side of the lower middle of the fixing ring one and fixing ring two. A rotating shaft is rotatably connected to the middle of each of the multiple screening screens. Multiple scrapers are uniformly fixedly installed on the side of the rotating shaft. The lower ends of the multiple scrapers abut against the upper ends of the screening screens. A rotating slider is fixedly installed above the scraper located in the middle and lower part of the box body. The rotating slider is slidably engaged with the rotating groove. Multiple ventilation pipes are uniformly connected and fixedly installed on one side of the box body. An air valve is fixedly installed at the upper end of each ventilation pipe. The ventilation pipes are connected to the cavities respectively.

[0007] Preferably, a top cover is fixedly installed at the upper end of the box, and a bracket is fixedly installed in the middle of the top cover.

[0008] Preferably, a motor is fixedly installed in the middle of the bracket, and the output end of the motor passes through the top cover and is fixedly connected to the upper end of the rotating shaft.

[0009] Preferably, a guide tube is fixedly connected to one side of the upper middle part of the top cover.

[0010] Preferably, a support leg is fixedly installed on the outer side of the lower middle part of the box body.

[0011] Preferably, a hopper is fixedly connected to the lower end of the box body, and an electromagnetic valve is fixedly installed on one side of the hopper.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] 1. In this utility model, during screening, the raw material is introduced into the box through the guide pipe. It first falls into the screening screen in the middle of the fixed ring and is screened downwards in sequence. The mesh size of each layer of screening screen gradually decreases, which can perform multiple screenings of the raw material. During the process, the operator can blow air into the corresponding cavity through the ventilation pipe via an external pipe and control the frequency through the air valve. With the help of the motor that can drive the rotating shaft and the scraper on the side, large particles blocked in the mesh and stacked plastic particles can be broken up and kept in motion. This can greatly improve the screening efficiency, avoid screening screen blockage, and reduce the waste of resources caused by rework.

[0014] 2. In this utility model, particles of the same volume that cannot pass through the corresponding mesh size of the sieve after screening will remain in the corresponding cavity. The operator can connect the ventilation pipe to the exhaust pipe to extract them by classification and collect them in a centralized manner, making the device more practical.

[0015] 3. In this utility model, the sieve screen in the middle of the fixed ring two and fixed ring three has a rotating slider on the side of the rotating scraper that allows it to rotate along the rotating groove opened in the fixed ring one and fixed ring two, making the connection of the scraper more stable and reducing the shaking of the box caused by the rotation of the scraper. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a raw material screening device for processing biodegradable plastic film bags proposed in this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of a raw material screening device for processing biodegradable plastic film bags proposed in this utility model;

[0018] Figure 3 This is a schematic diagram showing the connection relationship between the rotating shaft and multiple screening screens of a raw material screening device for processing biodegradable plastic film bags according to this utility model.

[0019] Figure 4 This is a schematic diagram showing the connection relationship between the rotating slider and the rotating chute of a raw material screening device for processing biodegradable plastic film bags according to this utility model.

[0020] Figure 5 This is a three-dimensional structural diagram of the scraper of a raw material screening device for processing biodegradable plastic film bags proposed in this utility model.

[0021] Legend: 1. Box body; 11. Support leg; 12. Hopper; 13. Solenoid valve; 14. Top cover; 15. Bracket; 16. Motor; 17. Guide pipe; 2. Fixing ring one; 21. Fixing ring two; 22. Fixing ring three; 23. Screening screen; 24. Rotating chute; 25. Rotating shaft; 27. Scraper; 28. Rotating slider; 29. ​​Ventilation pipe; 30. Air valve; 3. Cavity. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0024] Example 1, as Figure 1-4 As shown, this utility model provides a raw material screening device for processing biodegradable plastic film bags, including a box body 1. A first fixing ring 2, a second fixing ring 21, and a third fixing ring 22 are uniformly fixedly installed in the middle of the box body 1. Screening meshes 23 are fixedly installed in the middle of each of the fixing rings 2, 21, and 22. The filter holes of the multiple screening meshes 23 gradually decrease in size from top to bottom. Multiple cavities 3 are formed between the multiple screening meshes 23 and the box body 1. Rotating grooves 2 are provided on the outer side of the lower middle part of the first fixing ring 2 and the second fixing ring 21. 4. A rotating shaft 25 is rotatably connected to the middle of each of the multiple screening screens 23. Multiple scrapers 27 are evenly fixedly installed on the side of the rotating shaft 25. The lower ends of the multiple scrapers 27 abut against the upper ends of the screening screens 23 respectively. A rotating slider 28 is fixedly installed on the upper side of the scraper 27 located in the middle and lower part. The rotating slider 28 is slidably engaged with the rotating groove 24. Multiple ventilation pipes 29 are evenly connected and fixedly installed on one side of the box body 1. An air valve 30 is fixedly installed on the upper end of each ventilation pipe 29. The ventilation pipes 29 are connected to the cavity 3 respectively.

[0025] The specific settings and functions of this embodiment are described below. During screening, the raw material is introduced into the box 1 through the guide pipe 17. It first falls into the screening screen 23 in the middle of the fixed ring 2 and is screened downwards in sequence. The mesh size of each layer of screening screen 23 gradually decreases, which can perform multiple screenings of the raw material. During the process, the operator can blow air into the corresponding cavity 3 through the ventilation pipe 29 via an external pipe and control the frequency through the air valve 30. With the help of the motor 16 that can drive the rotating shaft 25 and the scraper 27 on the side, large particles and stacked plastic particles that are blocked in the mesh can be broken up and kept in motion, which can greatly improve the screening efficiency, avoid the clogging of the screening screen 23, and reduce the waste of resources caused by rework. After screening, particles that cannot pass through the corresponding mesh size of the screening screen 23 will remain in the corresponding cavity 3. The operator can connect the exhaust pipe through the ventilation pipe 29 to extract them by classification and collect them in a centralized manner, making the device more practical.

[0026] Example 2, as Figure 1 , Figure 2 and Figure 3 As shown, a top cover 14 is fixedly installed on the upper end of the box 1, a bracket 15 is fixedly installed in the middle of the top cover 14, a motor 16 is fixedly installed in the middle of the bracket 15, the output end of the motor 16 passes through the top cover 14 and is fixedly connected to the upper end of the rotating shaft 25, a guide pipe 17 is fixedly connected to one side of the middle of the upper end of the top cover 14, a support leg 11 is fixedly installed on the outer side of the middle of the lower end of the box 1, a hopper 12 is fixedly connected to the lower end of the box 1, and an electromagnetic valve 13 is fixedly installed on one side of the hopper 12.

[0027] The overall effect of this embodiment is that during screening, the raw material is introduced into the box 1 through the guide pipe 17. It first falls into the screening screen 23 in the middle of the fixed ring 2 and is screened downwards in sequence. The mesh size of each layer of screening screen 23 gradually decreases, which can perform multiple screenings of the raw material. During the process, the operator can blow air into the corresponding cavity 3 through the ventilation pipe 29 via an external pipe and control the frequency through the air valve 30. In conjunction with the motor 16 that can drive the rotating shaft 25 and the scraper 27 on the side, large particles and stacked plastic particles that are blocked in the mesh can be broken up and kept in motion, which can greatly improve screening efficiency, avoid clogging of the screening screen 23, and reduce rework. To reduce resource waste, the sieve 23 in the middle of the fixed ring 21 and the fixed ring 3 22 has a rotating slider 28 on the side of the rotating scraper 27, which allows it to rotate along the rotating groove 24 opened in the fixed ring 1 2 and the fixed ring 21. This makes the connection of the scraper 27 more stable and reduces the shaking of the box 1 caused by the rotation of the scraper 27. The plastic particles of the biodegradable plastic film bag that pass through the multiple sieves 23 in sequence will be discharged through the hopper 12 for easy collection by the user. After sieving, the particles that cannot pass through the corresponding mesh size of the sieve 23 will remain in the corresponding cavity 3. The operator can connect the exhaust pipe through the ventilation pipe 29 to extract them by classification and collect them in a centralized manner, making the device more practical.

[0028] The operating method and working principle of this device are as follows: During use, the raw material is first introduced into the housing 1 through the feed pipe 17. It will initially fall into the sieve 23 in the middle of the fixed ring 2 and be sieved downwards sequentially. The mesh size of each sieve 23 gradually decreases, allowing for multiple sieve separations of the raw material. During the process, the operator can blow air into the corresponding chamber 3 through the ventilation pipe 29 via an external pipe and control the frequency through the air valve 30. This, combined with the motor 16 that drives the rotating shaft 25 and the side scraper 27, removes large particles clogging the mesh. By breaking up and moving the stacked plastic granules, the screening efficiency can be greatly improved, the sieve screen 23 can be prevented from clogging, and the waste of resources caused by rework can be reduced. The plastic granules that pass through the biodegradable plastic film bags through the multiple sieve screens 23 will be discharged through the hopper 12 for easy collection by the user. After screening, the granules that cannot pass through the corresponding mesh size of the sieve screen 23 will remain in the corresponding cavity 3. The operator can connect the exhaust pipe through the ventilation pipe 29 to extract them in categories and collect them in a centralized manner, making the device more practical.

[0029] 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 other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A raw material screening device for processing biodegradable plastic film bags, comprising a housing (1), characterized in that: Fixed ring 1 (2), fixed ring 2 (21), and fixed ring 3 (22) are uniformly fixedly installed in the middle of the box (1). A sieve (23) is fixedly installed in the middle of each of the fixed ring 1 (2), fixed ring 2 (21), and fixed ring 3 (22). The filter holes of the multiple sieves (23) are arranged from top to bottom and gradually decrease in size. Multiple cavities (3) are formed between the multiple sieves (23) and the box (1). Rotating grooves (24) are opened on the outer side of the lower middle part of the fixed ring 1 (2) and fixed ring 2 (21). The middle parts of the multiple sieves (23) are rotatably connected. There is a rotating shaft (25), and multiple scrapers (27) are evenly fixedly installed on the side of the rotating shaft (25). The lower ends of the multiple scrapers (27) respectively abut against the upper end of the sieve (23). Among them, the upper side of the scraper (27) located in the middle and the lower part is fixedly installed with a rotating slider (28). The rotating slider (28) is slidably engaged with the rotating groove (24). Multiple ventilation pipes (29) are evenly connected and fixedly installed on one side of the box (1). Air valves (30) are fixedly installed on the upper end of each ventilation pipe (29). The ventilation pipes (29) are respectively connected to the cavity (3).

2. The raw material screening device for processing biodegradable plastic film bags according to claim 1, characterized in that: A top cover (14) is fixedly installed on the upper end of the box (1), and a bracket (15) is fixedly installed in the middle of the top cover (14).

3. The raw material screening device for processing biodegradable plastic film bags according to claim 2, characterized in that: A motor (16) is fixedly installed in the middle of the bracket (15). The output end of the motor (16) passes through the top cover (14) and is fixedly connected to the upper end of the rotating shaft (25).

4. The raw material screening device for processing biodegradable plastic film bags according to claim 2, characterized in that: A guide tube (17) is fixedly connected to one side of the upper middle part of the top cover (14).

5. The raw material screening device for processing biodegradable plastic film bags according to claim 1, characterized in that: A support leg (11) is fixedly installed on the outer side of the lower middle part of the box (1).

6. The raw material screening device for processing biodegradable plastic film bags according to claim 5, characterized in that: The lower end of the box (1) is connected to and fixed with a feeding hopper (12), and a solenoid valve (13) is fixedly installed on one side of the feeding hopper (12).

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