Drying device for recycling and processing plastic particles

Abstract

The invention relates to the technical field of plastic recovery pretreatment, in particular to a drying device for plastic particle recovery processing, which comprises a box body, a feeding unit is arranged on the box body, a first material collecting unit is fixedly connected to the bottom of the box body, sorting channels are arranged on both sides of the box body, and two sorting units are arranged in the box body. Each sorting unit is composed of two symmetrical overturning parts, a second material collecting unit is fixedly arranged at the bottom of the sorting channel, the first material collecting unit and the second material collecting unit are connected with a drying unit through a three-way pipe hose, and an adjusting valve is arranged on a pipeline of the second material collecting unit and the drying unit. Small materials and large materials are sorted into the first material collecting unit and the second material collecting unit through the sorting unit, and the problems that the drying effect of the small-particle materials is poor and the drying time becomes long due to the fact that airflow in the drying equipment is shielded by some large fragments are solved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic recycling pretreatment, and in particular to a drying device for recycling and processing plastic particles. Background Art

[0002] Plastic is a recyclable material. The waste materials are broken into blocks or granular materials by crushers and shredders, and the plastics are salvaged and concentrated by flotation technology. The salvaged plastics contain a lot of water, which needs to be drained initially and then put into the drying equipment for drying before subsequent processing, which is a waste of time. At the same time, in the existing technology, the materials are put into the drying equipment together. Due to uneven crushing, some larger fragments will block the airflow in the drying equipment, resulting in poor drying effect of small particles. At the same time, too much material will also lead to poor drying effect and long time. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the background technology and to propose a drying device for recycling and processing plastic particles.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a drying device for recycling and processing plastic particles, comprising a box body, an exhaust valve for exhausting is fixedly installed on the upper surface of the box body, a feeding unit is arranged on the box body, and the feeding unit feeds materials through a rotating feeding mechanism arranged in the feeding unit, a first collecting unit is fixedly connected to the bottom of the box body, sorting channels are arranged on both sides of the box body, two sorting units are arranged in the box body, and the two sorting units are arranged up and down, each sorting unit is composed of two symmetrical flipping parts, and the flipping parts are used to introduce materials into the sorting channel and introduce materials into the first collecting unit, a second collecting unit is fixedly arranged at the bottom of the sorting channel, the first collecting unit and the second collecting unit are connected to the drying unit through a three-way pipe hose, and a regulating valve is arranged on the pipeline between the second collecting unit and the drying unit.

[0005] In the above-mentioned drying device for recycling and processing plastic particles, the rotating feeding structure is composed of a rotating slot plate and a fixed slot plate of a circular structure, and the rotating plate is driven by a rotating motor fixedly arranged in the box body.

[0006] In the above-mentioned drying device for recycling and processing plastic particles, the flipping component includes a rotating shaft, a rotating filter plate and an arc-shaped guide belt, the guide belt is a flexible structure, the rotating shaft is rotatably connected to the notch connecting the box body and the sorting channel, one end of the rotating shaft extends out of the box body, the rotating filter plate is fixedly mounted on the rotating shaft, one side of the guide belt is fixedly mounted on the lower surface of the rotating filter plate, and the side of the guide belt away from the rotating filter plate is fixedly mounted on the notch connecting the box body and the sorting channel, and the cross-section of the guide belt is a square structure.

[0007] In the above-mentioned drying device for recycling and processing plastic particles, the first aggregate unit and the second aggregate unit are both barrel-shaped structures, the second aggregate unit is located below the first aggregate unit, and the lower surfaces of the first aggregate unit and the second aggregate unit are both provided with filter holes.

[0008] In the above-mentioned drying device for recycling and processing plastic particles, the flipping component is driven by a driving structure arranged on the outside of the box body, and the driving structure includes a reciprocating cylinder, two symmetrical rack rods and a gear. The reciprocating cylinder is fixedly mounted on the outer wall of the box body, and the two rack rods are fixedly mounted on the telescopic end of the reciprocating cylinder. The gear is fixedly mounted on the rotating shaft. The two rack rods correspond to the two gears on the left and right sides respectively. The rack rod is provided with a plurality of transmission teeth 1 and a plurality of transmission teeth 2. The transmission teeth 1 and the transmission teeth 2 correspond to the upper and lower gears respectively, and the transmission tooth 1 is meshed with the corresponding gear on the upper part.

[0009] In the above-mentioned drying device for recycling and processing plastic particles, a water tank is fixedly provided at the lower part of the second collecting unit.

[0010] In the above-mentioned drying device for recycling and processing plastic particles, a stirring motor is fixedly installed on the upper surface of the water tank, and a shaft is fixedly installed on the output shaft of the stirring motor. The shaft passes through the second aggregate unit and extends into the first aggregate unit. A stirring paddle 1 and a stirring paddle 2 are fixedly installed on the shaft and located in the first aggregate unit and the second aggregate unit, respectively.

[0011] In the above-mentioned drying device for recycling and processing plastic particles, a tension spring is arranged on the rotating filter plate, a fixed plate is fixedly arranged on the inner wall of the box body, and one end of the tension spring away from the rotating filter plate is fixedly installed on the lower surface of the fixed plate.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] 1. The present invention sorts small pieces of materials and large pieces of materials into the first aggregate unit and the second aggregate unit respectively through the sorting unit, thereby solving the problem that some larger fragments will block the airflow in the drying equipment, resulting in poor drying effect of small particles and thus prolonging the drying time.

[0014] 2. The present invention continuously feeds materials through the feeding mechanism, and the two sorting units work alternately, so that the materials can be continuously sorted, and the continuous input and drying of the materials can be achieved, thereby avoiding the situation where all the materials are introduced into the drying equipment at the same time, resulting in unsatisfactory drying.

[0015] 3. The present invention stirs materials of different sizes separately by means of the provided stirring paddles 1 and 2. The larger stirring paddle 2 drives the large materials to move, while the smaller and denser stirring paddle 1 drives the small materials to move, so that the effects of heating and airflow volatilization of each are better, thereby improving the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the planar structure of the present invention.

[0017] Figure 2 It is a cross-sectional structural schematic diagram of the present invention.

[0018] Figure 3 The present invention Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0019] Figure 4 It is a control flow chart of the present invention.

[0020] In the figure: 1. box body; 101. exhaust valve; 102. sorting channel; 2. feeding unit; 201. rotating slot plate; 202. fixed slot plate; 203. rotating motor; 3. first collecting unit; 4. second collecting unit; 5. drying unit; 6. three-way pipe; 7. regulating valve; 8. rotating shaft; 801. rotating filter plate; 802. guide belt; 803. gear; 9. reciprocating cylinder; 10. rack rod; 1001. transmission gear 1; 1002. transmission gear 2; 11. water tank; 12. stirring motor; 1201. stirring paddle 1; 1202. stirring paddle 2; 13. tension spring; 14. fixed plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] Example 1: Reference Figure 1-Figure 3A drying device for recycling and processing plastic particles comprises a box body 1, an exhaust valve 101 for exhaust is fixedly installed on the upper surface of the box body 1, a feeding unit 2 is arranged on the box body 1, and the feeding unit 2 feeds materials through a rotating feeding mechanism arranged in the feeding unit 2, a first collecting unit 3 is fixedly connected to the bottom of the box body 1, and sorting channels 102 are arranged on both sides of the box body 1, two sorting units are arranged in the box body 1, and the two sorting units are arranged up and down, and each sorting unit is composed of two symmetrical flipping components, and the flipping components are used to introduce materials into the sorting channel 102 and introduce materials into the first collecting unit 3, and a second collecting unit 4 is fixedly arranged at the bottom of the sorting channel 102, and the second collecting unit 4 is fixedly arranged at the bottom of the sorting channel 102. An aggregate unit 3 and a second aggregate unit 4 are connected to a drying unit 5 through a three-way pipe 6 hose. A regulating valve 7 is provided on the pipeline between the second aggregate unit 4 and the drying unit 5. The drying unit 5 is composed of a fan and a heat pump in the prior art. The feeding mechanism is rotated to feed the materials at a uniform speed. The materials of different sizes are respectively introduced into the first aggregate unit 3 and the second aggregate unit 4 through the flip assembly. A hot air flow is introduced into the first aggregate unit 3 and the second aggregate unit 4 through the drying unit 5. The air volume entering the first aggregate unit 3 and the second aggregate unit 4 is controlled by the regulating valve 7. The remaining moisture on the materials in the first aggregate unit 3 and the second aggregate unit 4 is dried and discharged through the exhaust valve 101.

[0024] The rotating feeding structure consists of a rotating slot plate 201 and a fixed slot plate 202 of a circular structure. The rotating plate is driven by a rotating motor 203 fixedly arranged in the box body 1. The rotating slot plate 201 is driven to rotate by the rotating motor 203. When the slot hole of the rotating slot plate 201 coincides with the slot hole of the fixed slot plate 202, the material enters the box body 1 from the feeding unit 2 and is separated by the sorting unit according to the size of the material.

[0025] The flipping component includes a rotating shaft 8, a rotating filter plate 801 and an arc-shaped guide belt 802. The guide belt 802 is a flexible structure. The rotating shaft 8 is rotatably connected to the notch connecting the box body 1 and the sorting channel 102. One end of the rotating shaft 8 extends out of the box body 1. The rotating filter plate 801 is fixedly installed on the rotating shaft 8. One side of the guide belt 802 is fixedly installed on the lower surface of the rotating filter plate 801. The side of the guide belt 802 away from the rotating filter plate 801 is fixedly installed on the notch connecting the box body 1 and the sorting channel 102. The cross-section of the guide belt 802 is a square structure. When the rotating filter plate 801 is in a horizontal position, the two rotating filter plates 801 in the same sorting unit conflict with each other. When the material remains on the rotating filter plate 801, the larger material enters the second collecting unit 4 through the guide belt 802 and the sorting channel 102.

[0026] The first aggregate unit 3 and the second aggregate unit 4 are both barrel-shaped structures, the second aggregate unit 4 is located below the first aggregate unit 3, and filter holes are provided on the lower surfaces of the first aggregate unit 3 and the second aggregate unit 4. The first aggregate unit 3 and the second aggregate unit 4 are both provided with sliding doors with arc structures for sliding, which is convenient for taking out the materials. At the same time, excess water inside flows out of the first aggregate unit 3 and the second aggregate unit 4 through the filter holes.

[0027] The flipping component is driven by a driving structure arranged on the outside of the box body 1. The driving structure includes a reciprocating cylinder 9, two symmetrical rack rods 10 and a gear 803. The reciprocating cylinder 9 is fixedly mounted on the outer wall of the box body 1. The two rack rods 10 are fixedly mounted on the telescopic end of the reciprocating cylinder 9. The gear 803 is fixedly mounted on the rotating shaft 8. The two rack rods 10 correspond to the two gears 803 on the left and right sides respectively. The rack rod 10 is provided with a plurality of transmission teeth 1001 and a plurality of transmission teeth 2 1002. The transmission teeth 1001 and the transmission teeth 2 1002 correspond to the upper and lower gears 803 respectively. The transmission teeth 1001 mesh with the corresponding gear 803 on the upper portion. When the reciprocating cylinder 9 is fixedly mounted on the outer wall of the box body 1, the two rack rods 10 are fixedly mounted on the telescopic end of the reciprocating cylinder 9. The gear 803 is fixedly mounted on the rotating shaft 8. The two rack rods 10 correspond to the two gears 803 on the left and right sides respectively. The rack rod 10 is provided with a plurality of transmission teeth 1001 and a plurality of transmission teeth 2 1002. The transmission teeth 1001 and the transmission teeth 2 1002 correspond to the upper and lower gears 803 respectively. The transmission teeth 1001 mesh with the corresponding gear 803 on the upper portion. When the reciprocating cylinder 9 drives the rack rod 10 to move downward, the transmission gear 1001 drives the upper gear 803 to rotate counterclockwise, so that the upper rotating filter plate 801 is flipped to a horizontal state. At this time, the material is filtered through the upper sorting unit. At the same time, the lower rotating filter plate 801 rotates clockwise at a specified angle. Under the action of gravity, the material accumulated on the rotating filter plate 801 is introduced into the first aggregate unit 3. When the reciprocating cylinder 9 drives the rack rod 10 to move upward, the material accumulated on the upper sorting unit is introduced into the lower sorting unit, and the larger material is continued to be filtered into the second aggregate unit 4 through the lower sorting unit. The above process is repeated to achieve continuous filtration.

[0028] A water tank 11 is fixedly provided at the lower part of the second material collecting unit 4 , and the water attached to the materials entering the first material collecting unit 3 and the second material collecting unit 4 flows into the water tank 11 to be collected.

[0029] A stirring motor 12 is fixedly provided on the upper surface of the water tank 11, and a shaft is fixedly installed on the output shaft of the stirring motor 12. The shaft passes through the second aggregate unit 4 and extends into the first aggregate unit 3. A stirring paddle 1 1201 and a stirring paddle 2 1202 are fixedly installed on the shaft and located in the first aggregate unit 3 and the second aggregate unit 4, respectively. The size of stirring paddle 2 is larger than that of stirring paddle 1, and the number of stirring paddles 1 is larger than the number of stirring paddles 2, which can better drive large particles of material to perform flipping movement in the second aggregate unit 4. At the same time, through a large number of stirring paddles 1, a large number of small materials can move more violently in the first aggregate unit 3 and be dried better. The stirring motor 12 drives stirring paddle 1 1201 and stirring paddle 2 1202 to stir the materials in the first aggregate unit 3 and the second aggregate unit 4 respectively, thereby improving the drying rate.

[0030] A tension spring 13 is provided on the rotating filter plate 801, and a fixed plate 14 is fixedly provided on the inner wall of the box body 1. One end of the tension spring 13 away from the rotating filter plate 801 is fixedly installed on the lower surface of the fixed plate 14. When the rack rod 10 moves downward by a specified distance, the transmission tooth 1001 disengages from the upper gear 803. At the same time, the transmission tooth 2 1002 engages with the lower gear 803 and drives the lower rotating filter plate 801 to rotate. At this time, the upper rotating filter plate 801 is fixed in a horizontal position by the tension spring 13. When the rack rod 10 moves upward by a specified distance, the transmission tooth 2 1002 disengages from the lower gear 803, and the lower rotating filter plate 801 is fixed in a horizontal position by the tension spring 13.

[0031] Example 2: Reference Figure 4 , a monitoring control module is arranged in the box 1, and the monitoring control module includes a humidity detection control unit and a pressure detection control unit;

[0032] The humidity detection module is used to obtain the detected humidity detected by the humidity sensor arranged at the exhaust valve 101, perform a first data analysis on the detected humidity to obtain a first data analysis result, and implement the first adjustment scheme or the second adjustment scheme according to the first data analysis result, as well as the operation of the drying unit 5;

[0033] The pressure detection control unit is used to obtain a first detection pressure value F1 detected by a first pressure sensor respectively arranged on the upper surface of the water tank 11 and a second detection pressure value F2 detected by a second pressure sensor arranged on the upper surface of the second aggregate unit 4, perform a second data analysis on the first detection pressure value F1 and the second detection pressure value F2 to obtain a second data analysis result, and control the regulating valve 7 according to the second analysis result to achieve the effect of controlling the air volume entering the first aggregate unit 3 and the second aggregate unit 4 respectively.

[0034] When implementing the first adjustment scheme, the specific steps are: adjusting the first speed v1 of the rotating motor 203 to adjust the feeding rate; when the first adjustment scheme is initially implemented, the first speed v1 of the rotating motor 203 can be adjusted to 1.5 times the standard speed of the rotating motor 203, and when the first adjustment scheme is subsequently implemented, the running time is adjusted to 1.5 times the speed after the last adjustment;

[0035] When implementing the second adjustment scheme, the specific steps are: adjusting the second speed v2 of the stirring motor 12 to increase the drying rate; the adjusted speed may be 1.2 times the second speed, and when the second adjustment scheme is subsequently implemented, the speed is adjusted to 1.2 times the last adjusted speed;

[0036] The processing method in the pressure detection control unit is as follows:

[0037] Acquire a first detection pressure value F1 and a second detection pressure value F2;

[0038] By formula The second speed v1 of the stirring motor 12 is calculated; k is the first coefficient;

[0039] And, regulating the regulating valve 7 according to the first pressure value F1 and the second pressure value F2, the specific regulating method is to regulate the valve size of the regulating valve 7, so that the drying unit 5 controls the air volume entering the first material collecting unit 3 and the second material collecting unit 4 according to the ratio of the first pressure value F1 and the second pressure value F2;

[0040] The processing method of the humidity detection control unit is as follows:

[0041] Obtain the detected humidity and perform data analysis on the detected humidity;

[0042] By formula The real-time standard processing humidity is calculated; F0 is the total weight of the standard material; H0 is the rated standard processing humidity, which is detected when the total weight of the standard material is processed; k2 is the second coefficient;

[0043] The detected humidity is compared with the real-time standard processing humidity H. If the detected humidity is not less than the real-time standard processing humidity H, the drying rate of the box 1 is determined to be normal and a continuous detection label is generated; if the detected humidity is less than the real-time standard processing humidity H, the drying rate of the box 1 is determined to be abnormal and a first adjustment label is generated, and the first adjustment plan is implemented;

[0044] Conduct a retrospective analysis on the first adjustment detection humidity after the implementation of the first adjustment plan. If the detection humidity is not less than the real-time standard processing humidity H, the first adjustment plan is determined to be effective and a first adjustment confirmation label is generated; if the detection humidity is less than the real-time standard processing humidity H, the first evaluation plan is implemented;

[0045] The first evaluation scheme is specifically: calculating the ratio of the first adjusted detection humidity to the detection humidity before the implementation of the first adjustment scheme to obtain a first adjusted evaluation value A1;

[0046] Perform data analysis on the first adjustment evaluation value A1. If A1 is not greater than 0.8, it is determined that the implementation of the first adjustment plan is also effective and a first adjustment continuation label is generated; if A1 is greater than 0.8, it is determined that the implementation of the first adjustment plan is invalid and a second adjustment label is generated;

[0047] Continue to implement the first adjustment plan according to the first adjustment continuation label, and implement the same first evaluation plan after implementing the first adjustment plan, and perform a retrospective analysis on the first adjustment evaluation value A1 after implementing the first evaluation plan;

[0048] According to the first adjustment determination label, the running time of the rotating motor 203 after the last implementation of the first adjustment scheme is maintained; according to the second adjustment label, the second control scheme is implemented, and the second adjustment detection humidity is subjected to a secondary traceability analysis. If the second adjustment detection humidity is not less than the real-time standard processing humidity H, the second adjustment scheme is determined to be effective and a second adjustment confirmation label is generated; if the second adjustment detection humidity is still less than the real-time standard processing humidity H, the second evaluation scheme is implemented;

[0049] The second evaluation scheme is specifically as follows: calculating the ratio of the second adjusted detection humidity to the first adjusted detection humidity obtained last time to obtain a second adjusted evaluation value A2, and performing data analysis on the second adjusted evaluation value A2;

[0050] If the second adjustment evaluation value A2 is not greater than 0.8, the implementation of the second adjustment plan is determined to be equally effective and a second adjustment continuation label is generated; if the second adjustment evaluation value A2 is greater than 0.8, the implementation of the second adjustment plan is determined to be invalid and the initial humidity of the material is determined to be low, and the second adjustment detection humidity after the last implementation of the second adjustment plan is set as the real-time standard processing humidity H in this drying operation.

[0051] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A drying device for recycling plastic particles, comprising a housing (1), characterized in that: An exhaust valve (101) for exhausting is fixedly mounted on the upper surface of the box body (1); a feeding unit (2) is arranged on the box body (1); the feeding unit (2) feeds materials through a rotating feeding mechanism arranged in the feeding unit (2); a first collecting unit (3) is fixedly connected to the bottom of the box body (1); sorting channels (102) are arranged on both sides of the box body (1); two sorting units are arranged in the box body (1); the two sorting units are arranged up and down; each sorting unit is composed of two symmetrical flipping components; the flipping components are used to guide materials into the sorting channel (102) and guide materials into the first collecting unit (3); a second collecting unit (4) is fixedly arranged at the bottom of the sorting channel (102); the first collecting unit (3) and the second collecting unit (4) are connected to a drying unit (5) through a three-way pipe (6) hose; and a regulating valve (7) is arranged on the pipeline between the second collecting unit (4) and the drying unit (5).

2. A drying device for recycling plastic particles according to claim 1, characterized in that: The rotating feeding structure is composed of a rotating slot plate (201) and a fixed slot plate (202) of a circular structure, and the rotating plate is driven by a rotating motor (203) fixedly arranged in the box body (1).

3. A drying device for recycling plastic particles according to claim 1, characterized in that: The turning component comprises a rotating shaft (8), a rotating filter plate (801) and a guide belt (802) of an arc structure; the guide belt (802) is of a flexible structure; the rotating shaft (8) is rotatably connected to a notch connecting the box body (1) and the sorting channel (102); one end of the rotating shaft (8) extends out of the box body (1); the rotating filter plate (801) is fixedly mounted on the rotating shaft (8); one side of the guide belt (802) is fixedly mounted on the lower surface of the rotating filter plate (801); the side of the guide belt (802) away from the rotating filter plate (801) is fixedly mounted on the notch connecting the box body (1) and the sorting channel (102); and the cross section of the guide belt (802) is of a square structure.

4. A drying device for recycling plastic particles according to claim 1, characterized in that: The first aggregate unit (3) and the second aggregate unit (4) are both barrel-shaped structures; the second aggregate unit (4) is located below the first aggregate unit (3); and filter holes are provided on the lower surfaces of the first aggregate unit (3) and the second aggregate unit (4).

5. A drying device for recycling plastic particles according to claim 3, characterized in that: The flipping component is driven by a driving structure arranged outside the box body (1), the driving structure comprising a reciprocating cylinder (9), two symmetrical rack rods (10) and a gear (803), the reciprocating cylinder (9) is fixedly mounted on the outer wall of the box body (1), the two rack rods (10) are fixedly mounted on the telescopic end of the reciprocating cylinder (9), the gear (803) is fixedly mounted on the rotating shaft (8), the two rack rods (10) correspond to the two gears (803) on the left and right sides respectively, the rack rod (10) is provided with a plurality of transmission teeth 1 (1001) and a plurality of transmission teeth 2 (1002), the transmission teeth 1 (1001) and the transmission teeth 2 (1002) correspond to the upper and lower gears (803) respectively, and the transmission teeth 1 (1001) mesh with the corresponding gear (803) on the upper part.

6. A drying device for recycling plastic particles according to claim 1, characterized in that: A water tank (11) is fixedly arranged at the lower part of the second material collecting unit (4).

7. A drying device for recycling plastic particles according to claim 6, characterized in that: A stirring motor (12) is fixedly arranged on the upper surface of the water tank (11), and a shaft is fixedly installed on the output shaft of the stirring motor (12), the shaft passes through the second aggregate unit (4) and extends into the first aggregate unit (3), and a stirring paddle 1 (1201) and a stirring paddle 2 (1202) are fixedly installed on the shaft and located in the first aggregate unit (3) and the second aggregate unit (4), respectively.

8. A drying device for recycling plastic particles according to claim 3, characterized in that: The rotating filter plate (801) is provided with a tension spring (13), and a fixing plate (14) is fixedly provided on the inner wall of the box body (1), and one end of the tension spring (13) away from the rotating filter plate (801) is fixedly mounted on the lower surface of the fixing plate (14).

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