A filtering apparatus for condensed ring aromatic hydrocarbon modifier

Abstract

The utility model relates to condensed ring aromatic hydrocarbon modifier technical field discloses a kind of filtering equipment for condensed ring aromatic hydrocarbon modifier, including processing box, the processing box top is fixedly connected with connecting frame, the connecting frame top inner wall is fixedly connected with filter screen, the connecting frame right side outer wall is rotatably connected with rotating door, the processing box bottom inner wall is slidably connected with scrap box, the processing box inner wall is fixedly connected with first motor, the first motor outer ring is rotatably connected with rotating disc.The utility model is filtered by three-stage collaborative filtering system, the structure design of filter screen preliminary interception large particle impurities, reciprocating sliding filter box dispersion material and fine filtering smaller impurities, vibration triangular filter plate depth separation micro-impurities, combined with convenient cleaning and splash recovery device, gradient purification to condensed ring aromatic hydrocarbon modifier is realized, filtering precision and impurity interception efficiency are significantly improved, while effectively improve material recovery rate and avoid secondary pollution of impurity.

Description

Technical Field

[0001] This utility model relates to the field of polycyclic aromatic hydrocarbon modifiers, specifically a filtration device for polycyclic aromatic hydrocarbon modifiers. Background Technology

[0002] The highly rigid planar structure of the benzene ring in polycyclic aromatic hydrocarbons (PAHs) endows them with excellent mechanical properties, as well as superior electrical, thermal, mechanical, and optical properties, making them promising for a wide range of applications. PAHs are also widely used as plasticizers in rubber. Plasticizers are substances that increase the plasticity and flexibility of polymer materials. Adding appropriate amounts of plasticizers during rubber processing can make the rubber more flexible and easier to process and mold. The addition of PAHs can improve the softness, processability, and durability of products, reduce costs, and increase production efficiency.

[0003] The equipment typically relies on a single filtration unit (such as a regular filter screen or unmodified filter media) for filtration. These units either have large pore sizes, making it impossible to intercept tiny impurities, or they use excessively small pore sizes in pursuit of precision, resulting in a sharp increase in filtration resistance and easy clogging. In practice, it is difficult to achieve both high flow rate and high precision in filtration.

[0004] To address the aforementioned issues, a filtration device for polycyclic aromatic hydrocarbon modifiers is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a filtration device for polycyclic aromatic hydrocarbon modifiers, which solves the problems in the prior art that lead to a sharp increase in filtration resistance, easy clogging, and difficulty in achieving both high throughput and high precision in actual filtration.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a filtration device for polycyclic aromatic hydrocarbon modifiers, comprising a processing box, a connecting frame fixedly connected to the top of the processing box, a filter screen fixedly connected to the inner wall of the top of the connecting frame, a rotating door rotatably connected to the outer right side of the connecting frame, a waste box slidably connected to the inner bottom of the processing box, a first motor fixedly connected to the inner wall of the processing box, a rotating disk rotatably connected to the outer ring of the first motor, a hopper fixedly connected to the inner right side of the processing box, a rotating sleeve fixedly connected to the outer ring of the top of the first motor, a connecting rod rotatably connected to the outer wall of the rotating sleeve, a connecting plate rotatably connected to one end of the connecting rod, a fixed frame fixedly connected to the inner wall of the processing box, a sliding block slidably connected to the inner wall of the fixed frame and rotatably connected to the connecting plate, a filter box fixedly connected to the top of the sliding block and slidably connected to the inner wall of the processing box, evenly distributed baffles fixedly connected to the inner wall of the filter box, and a filter assembly disposed inside the bottom of the processing box.

[0007] By adopting the above technical solution, multi-stage filtration treatment of polycyclic aromatic hydrocarbon modifiers can be achieved, thereby improving filtration effect and efficiency.

[0008] As a further description of the above technical solution: the filter assembly includes a support block, which is fixedly connected to the inner walls of the front and rear ends of the processing box. A second motor is fixedly connected to the rear end of the support block on the left front end. A rotating column is fixedly connected to the output end of the second motor. A drive sprocket is fixedly connected to the outer ring of the front end of the rotating column.

[0009] By adopting the above technical solution, a power driving basis is provided for the filter components, so as to realize subsequent fine filtration operations.

[0010] As a further description of the above technical solution: a rotating rod is rotatably connected inside the support block on the right side, and a driven sprocket is fixedly connected to the outer ring of the front end of the rotating rod.

[0011] By adopting the above technical solution, the continuous operation of the filtration process is guaranteed.

[0012] As a further description of the above technical solution: the driving sprocket and the driven sprocket are connected by chain meshing.

[0013] By adopting the above technical solution, a stable and efficient power transmission mechanism was constructed to ensure that the filter components can operate in a coordinated manner.

[0014] As a further description of the above technical solution: the rotating rod and the outer rings of the front and rear ends of the rotating column are both fixedly connected with cams.

[0015] By adopting the above technical solution, when the rotating rod and the rotating column rotate synchronously under the action of sprocket transmission, the cams on the outer rings at both ends will rotate accordingly. Due to the irregular profile shape of the cams, they will periodically push or release the components in contact with them (such as filter plates, vibrating screens, etc.) during rotation, causing these components to reciprocate in the up-down or left-right directions.

[0016] As a further description of the above technical solution: a second spring is fixedly connected to the top of the support block, and a support plate is fixedly connected to the top of the second spring.

[0017] By adopting the above technical solution, the second spring at the top of the support block provides elastic support to the support disk. When the cam rotates and pushes the support disk upward, the second spring is compressed and stores elastic potential energy; when the cam rotates to the non-protruding part, the second spring releases its potential energy and pushes the support disk back to its original position. This elastic coordination enables the support disk to produce stable up-and-down reciprocating motion as the cam rotates.

[0018] As a further description of the above technical solution: protective plates are fixedly connected to the top of both the front and rear ends of the support plate, and a triangular filter plate is fixedly connected to the top of the middle end of the support plate.

[0019] By adopting the above technical solution, the protective plates at both ends of the support plate can play a blocking role, preventing the modifier from splashing out from the edge of the support plate during the vibration filtration process, ensuring that all the modifier can be filtered, reducing raw material waste and keeping the inside of the equipment clean.

[0020] As a further description of the above technical solution: a first spring is fixedly connected to the top of the protective plate, and the first spring is fixedly connected to the inner wall of the processing box.

[0021] By adopting the above technical solution, the vibration stability of the support plate and filter components is further enhanced, while providing dual elastic buffering and improving the reliability of equipment operation.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a filtration device for polycyclic aromatic hydrocarbon modifiers. First, through a three-stage synergistic filtration system, the filter screen initially intercepts large particulate impurities, the reciprocating sliding filter box disperses the material and finely filters smaller impurities, and the vibrating triangular filter plate deeply separates minute impurities. Combined with a convenient cleaning and splash-proof recovery device, it achieves gradient purification of polycyclic aromatic hydrocarbon modifiers, significantly improving filtration accuracy and impurity interception efficiency, while effectively increasing material recovery rate and avoiding secondary pollution from impurities. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall internal structure of this utility model; Figure 3 This is a schematic diagram of the structure of the filter box of this utility model; Figure 4 This is a schematic diagram of the triangular filter plate of this utility model.

[0024] In the diagram: 1. Processing box; 2. Connecting frame; 3. Filter screen; 4. Rotating door; 5. Waste box; 6. First motor; 7. Rotating disc; 8. Protective plate; 9. Hopper; 10. Rotating sleeve; 11. Connecting rod; 12. Connecting plate; 13. Fixed frame; 14. Sliding block; 15. Filter box; 16. Baffle; 17. First spring; 18. Support block; 19. Second spring; 20. Support disc; 21. Triangular filter plate; 22. Second motor; 23. Rotating column; 24. Drive sprocket; 25. Chain; 26. Rotating rod; 27. Cam; 28. Driven sprocket. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] To further understand the contents of this utility model, a detailed description of this utility model will be provided with reference to the accompanying drawings.

[0027] Reference Figure 1 -4. A filtration device for polycyclic aromatic hydrocarbon modifiers according to this utility model includes a processing box 1, which serves as the main supporting frame of the device. A connecting frame 2 is fixedly connected to its top by welding. The connecting frame 2 is a rectangular frame structure with an open top, used to receive the polycyclic aromatic hydrocarbon modifier to be filtered. A filter screen 3 is detachably fixed to the inner wall of the top of the connecting frame 2 by bolts. The filter screen 3 is made of stainless steel and has a mesh size of 80-120, used for initial interception of large particulate impurities. A rotating door 4 is rotatably connected to the outer wall of the right side of the connecting frame 2 by a hinge. A rubber sealing gasket is provided at the contact edge between the rotating door 4 and the connecting frame 2, which can achieve a seal when closed and facilitate cleaning of the filter screen 3 and the inside of the connecting frame 2 when opened.

[0028] The bottom inner wall of the processing box 1 has two parallel sliding grooves, and the outer walls of the waste chip box 5 are equipped with corresponding sliders. The waste chip box 5 is slidably connected to the bottom inner wall of the processing box 1 through the cooperation of the sliders and the sliding grooves. The front end of the waste chip box 5 is fixedly connected with a handle, which is convenient to pull out to realize waste chip recycling.

[0029] Second-level filter driver and execution unit assembly The first motor 6 is fixedly connected to the inner wall of the left side of the processing box 1 by a motor base bolt. The first motor 6 is a servo motor, and its output shaft is set in the horizontal direction. The outer ring of the output shaft of the first motor 6 is fixedly connected to the rotating disk 7 by a flat key. At the same time, the outer ring of the top output shaft of the first motor 6 is also fixedly connected to the rotating sleeve 10 by a flat key. The rotating sleeve 10 is located above the rotating disk 7, and the outer wall of the rotating sleeve 10 is rotatably connected to the connecting rod 11 by a pin. A fixed frame 13 is bolted to the right side of the rotating sleeve 10 on the inner wall of the processing box 1. The fixed frame 13 has a U-shaped structure and a sliding groove on its inner wall. A sliding block 14 is adapted to slide in the sliding groove of the fixed frame 13. The left side wall of the sliding block 14 is rotatably connected to the end of the connecting rod 11 away from the rotating sleeve 10 by a pin. A filter box 15 is welded to the top of the sliding block 14. The filter box 15 is a rectangular box with an open top and a filter plate structure at the bottom. The filter plate mesh size is set to 200-250 mesh. The outer walls of the filter box 15 are attached to the inner wall of the processing box 1 and can slide horizontally along the inner wall of the processing box 1. Evenly distributed baffles 16 are welded to the inner wall of the filter box 15. The baffles 16 are vertically arranged and the distance between adjacent baffles 16 is 3-5cm, which is used to disperse materials. A hopper 9 is fixedly connected to the inner right side of the processing box 1 above the filter box 15 via a bracket. The hopper 9 is funnel-shaped, and its lower outlet is directly opposite the feeding area of ​​the filter box 15, which is used to guide the modifier after the first stage of filtration into the filter box 15 precisely.

[0030] Third-stage filtration assembly The filter assembly includes four support blocks 18, which are fixedly connected to the inner walls of the front and rear ends of the processing box 1 by bolts and are arranged in a rectangular pattern. The rear end of the support block 18 at the front left end is fixedly connected to a second motor 22 via a motor mount. The second motor 22 is a stepper motor, and its output shaft is set in a horizontal direction. The output end of the second motor 22 is fixedly connected to a rotating column 23 via a coupling. The rear end of the rotating column 23 is rotatably connected to the bearing hole of the support block 18 at the rear left end via a bearing. The outer ring of the front end of the rotating column 23 is fixedly connected to a drive sprocket 24 via a flat key. Bearing holes are opened on the opposite surfaces of the two support blocks 18 on the right side. The two ends of the rotating rod 26 are rotatably connected to the bearing holes of the support block 18 on the right side via bearings. The rotating rod 26 is parallel to the rotating column 23. The outer ring of the front end of the rotating rod 26 is fixedly connected to a driven sprocket 28 via a flat key. The drive sprocket 24 and the driven sprocket 28 are of the same specification and are connected by a chain 25 to form a transmission mechanism. The outer rings at both ends of the rotating rod 26 and the rotating column 23 are fixedly connected to cams 27 by flat keys. The eccentricity of the cams 27 is set to 5-8mm, and the phases of the two cams 27 on the same shaft are consistent. The top of the support block 18 is fixedly connected to a second spring 19 by welding. The second spring 19 is a compression spring, and the number of springs 19 corresponds to the number of support blocks 18, with a total of four. The tops of the four second springs 19 are fixedly connected to a support plate 20 by welding. The support plate 20 has a rectangular plate structure, and its bottom contacts the top of the cam 27. When the cam 27 rotates, it can push the support plate 20 to move up and down. Protective plates 8 are welded and fixed to the top of both ends of the support plate 20. The protective plates 8 are vertically arranged rectangular plates with a height of 10-15cm, used to prevent the modifier from splashing out due to vibration. A triangular filter plate 21 is detachably fixed to the top of the middle of the support plate 20 by bolts. The cross-section of the triangular filter plate 21 is V-shaped, and its inner wall is a filter cloth structure with a mesh size of 300-350 mesh and a V-angle of 60-90 degrees to increase the contact area with the modifier. A first spring 17 is welded and fixed to the top of the protective plate 8. The first spring 17 is a tension spring, and its other end is fixedly connected to the hanging ring on the inner wall of the top of the processing box 1 by a hook to achieve elastic tension on the support plate 20.

[0031] Equipment operation procedures Feeding and first-stage filtration operation The operator slowly pours the polycyclic aromatic hydrocarbon modifier to be filtered through the top opening of the connecting frame 2. The modifier first flows through the filter screen 3, which initially intercepts large particulate impurities such as raw material residue debris and agglomerates with a diameter greater than 0.15 mm. After initial filtration, the modifier, guided by gravity through the hopper 9, flows precisely into the filter box 15 below. When impurities accumulate on the surface of the filter screen 3 and affect the feeding speed, this can be judged by observing the feeding flow rate. The operator can hold the handle of the rotating door 4, rotate it around the hinge to open the rotating door 4, and use tools such as a brush to clean the impurities on the surface of the filter screen 3. The cleaned impurities fall directly into the waste collection box 5 below. After cleaning, the rotating door 4 is closed to ensure that the connecting frame 2 is sealed.

[0032] Second-stage filtration and material dispersion operation The first motor 6 is started. The output shaft of the first motor 6 drives the rotating sleeve 10 to perform a circular motion. The rotating sleeve 10 drives one end of the connecting rod 11 to perform a circular motion through a pin. The other end of the connecting rod 11 pushes the sliding block 14 to perform a horizontal reciprocating motion in the sliding groove of the fixed frame 13 through a pin. The reciprocating stroke is set to 10-15cm, and the reciprocating frequency matches the speed of the first motor 6 and can be adjusted by the motor controller. The sliding block 14 drives the filter box 15 to perform a horizontal reciprocating motion synchronously. The modifier entering the filter box 15 is dispersed into multiple flow states under the blocking and guiding action of the baffle 16, avoiding material agglomeration and extending the residence time of the material in the filter box 15. The residence time is controlled at 3-5 seconds. Smaller impurities in the modifier with a diameter between 0.06-0.15mm are intercepted by the filter plate at the bottom of the filter box 15. The filtered modifier flows out from below the filter plate and falls into the support plate 20 area below.

[0033] Third-stage vibration filtration and material recovery operation The second motor 22 is started, and its output shaft drives the rotating column 23 to rotate. The rotating column 23 drives the driving sprocket 24 to rotate synchronously. The driving sprocket 24 drives the driven sprocket 28 to rotate via the chain 25, which in turn drives the rotating rod 26 to rotate synchronously and in the same direction as the rotating column 23. The rotation speed is set to 150-200 r / min. The cam 27 on the rotating column 23 and the rotating rod 26 rotates synchronously with the shaft. The protruding part of the cam 27 periodically pushes the bottom of the support plate 20, causing the support plate 20 to move upward. At this time, the second spring 19 is compressed and the first spring 17 is stretched. When the non-protruding part of the cam 27 contacts the support plate 20, under the combined action of the elastic restoring force of the second spring 19 and the contraction force of the first spring 17, the support plate 20 returns to its original position downward. This cycle continues, causing the support plate 20 to drive the triangular filter plate 21 to generate high-frequency reciprocating vibration in the vertical direction. The vibration frequency is the same as the rotation speed of the cam 27, and the amplitude is 5-8 mm. The modifier flowing out from the second-stage filtration falls into the V-shaped groove of the triangular filter plate 21. The vibration breaks the adsorption force between the tiny impurities (diameter less than 0.06 mm) and the liquid modifier, causing the tiny impurities to adhere to the surface of the filter cloth of the triangular filter plate 21, achieving deep filtration. The clean modifier flows along the V-shaped slope of the triangular filter plate 21 to the pre-set discharge port at the bottom of the processing box 1 (not shown in the diagram), completing the collection. The protective plate 8 prevents the modifier from splashing out from the edge of the support plate 20 during vibration, ensuring that all materials enter the filtration process. After the equipment has been running for a period of time, such as 8-12 hours, turn off the first motor 6 and the second motor 22, open the rotating door 4 to clean the filter screen 3, and pull out the waste box 5 to empty the internal impurities. If there is a lot of impurities accumulated on the surface of the triangular filter plate 21, the fixing bolts of the triangular filter plate 21 can be removed, the triangular filter plate 21 can be removed for cleaning or the filter cloth can be replaced. After maintenance, the equipment can be reassembled and put back into use.

[0034] Working principle: The polycyclic aromatic hydrocarbon modifier to be filtered is first introduced into the equipment through the opening of the connecting frame 2 fixedly connected to the top of the processing box 1, and enters the pretreatment filtration stage: The filter screen 3 fixed to the inner wall of the top of the connecting frame 2 first intercepts the modifier, directly filtering out solid impurities with larger particle diameters, such as raw material residue debris, agglomerates, etc. The rotating sleeve 10 fixed to the outer ring of the top of the first motor 6 moves in a circular motion with the motor output shaft. The connecting rod 11 rotatably connected to the outer wall of the rotating sleeve 10 converts the circular motion into the reciprocating linear motion of the connecting plate 12 rotatably connected to its other end; because the connecting plate 12 is rotatably connected to the sliding block 14, and the sliding block 14 slides... The sliding block 14 drives the top-fixed filter box 15 to slide horizontally back and forth along the fixed frame 13, which is fixed to the inner wall of the processing box 1. The evenly distributed baffles 16 fixed to the inner wall of the filter box 15 disperse the modifier during the sliding process, preventing agglomeration and prolonging the residence time. The filter box 15 achieves the second stage of fine filtration with a filter material mesh size higher than that of the filter screen 3, intercepting smaller diameter impurities. When impurities accumulate on the surface of the filter screen 3 and need to be cleaned, the operator can rotate the rotating door 4 on the outer right side of the connecting frame 2 to clean the filter box 15. The rotating column 23 fixed at the output end of the second motor 22 rotates accordingly. The driving sprocket 24, fixed on the outer ring of the front end, drives the driven sprocket 28, which is fixed on the outer ring of the front end of the rotating rod 26, which is rotatably connected inside the right support block 18, to rotate. This causes the rotating column 23 and the rotating rod 26 to rotate synchronously and in the same direction. The cams 27, fixed on the outer rings of the front and rear ends of the rotating column 23 and the rotating rod 26, rotate together. Their eccentric structure generates a periodic pushing force on the bottom of the support plate 20. The bottom of the support plate 20 is connected to the top of the support block 18 through the second spring 19, and the protective plates 8, fixed on the top of the front and rear ends of the support plate 20, are connected to the inner wall of the processing box 1 through the first spring 17. The pushing force of the cam 27 and the first spring 17 are combined to create a periodic pushing force on the bottom of the support plate 20. Under the combined action of the elastic restoring force of spring 17 and the second spring 19, the support plate 20 drives the triangular filter plate 21 fixed at the top center to perform vertical high-frequency reciprocating vibration. The V-shaped structure of the triangular filter plate 21 increases the contact area with the modifier. The vibration breaks the adsorption force between the tiny impurities and the liquid, causing the impurities to adhere to the plate surface to achieve the third stage of deep filtration. At the same time, the V-shaped structure guides the clean modifier to flow along the inclined surface to the pre-set discharge structure at the bottom of the processing box 1. The protective plate 8 prevents the modifier from splashing out due to vibration, ensuring the material recovery rate. The material flows into the waste chip box 5, which can be slid out along the inner wall of the processing box 1 to complete the waste chip recovery and avoid secondary pollution from impurities.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A filtering apparatus for polycyclic aromatic hydrocarbon modifiers, comprising a processing tank (1), characterized in that: A connecting frame (2) is fixedly connected to the top of the processing box (1). A filter screen (3) is fixedly connected to the inner wall of the top of the connecting frame (2). A rotating door (4) is rotatably connected to the outer right side of the connecting frame (2). A waste box (5) is slidably connected to the inner bottom of the processing box (1). A first motor (6) is fixedly connected to the inner wall of the processing box (1). A rotating disk (7) is rotatably connected to the outer ring of the first motor (6). A hopper (9) is fixedly connected to the inner right side of the processing box (1). A rotating sleeve (10) is fixedly connected to the outer top of the first motor (6). The rotating sleeve (10) is... A connecting rod (11) is rotatably connected to the wall, and a connecting plate (12) is rotatably connected to one end of the connecting rod (11). A fixed frame (13) is fixedly connected to the inner wall of the processing box (1). A sliding block (14) is slidably connected to the inner wall of the fixed frame (13), and the sliding block (14) is rotatably connected to the connecting plate (12). A filter box (15) is fixedly connected to the top of the sliding block (14), and the filter box (15) is slidably connected to the inner wall of the processing box (1). A baffle (16) with even distribution is fixedly connected to the inner wall of the filter box (1). A filter assembly is provided inside the bottom of the processing box (1).

2. The filtration device for polycyclic aromatic hydrocarbon modifiers according to claim 1, characterized in that: The filter assembly includes a support block (18), which is fixedly connected to the inner walls of the front and rear ends of the processing box (1). A second motor (22) is fixedly connected to the rear end of the support block (18) on the left front end. A rotating column (23) is fixedly connected to the output end of the second motor (22). An active sprocket (24) is fixedly connected to the outer ring of the front end of the rotating column (23).

3. A filtering apparatus for polycyclic aromatic hydrocarbon modifiers as defined in claim 2, characterized in that: The support block (18) on the right side is rotatably connected to a rotating rod (26), and the outer ring of the front end of the rotating rod (26) is fixedly connected to a driven sprocket (28).

4. The filtering apparatus for polycyclic aromatic hydrocarbon modifier according to claim 2, wherein: The driving sprocket (24) and the driven sprocket (28) are connected by a chain (25).

5. The filtering apparatus for condensed polycyclic aromatic hydrocarbon modifier of claim 3, wherein: The rotating rod (26) and the outer rings of the front and rear ends of the rotating column (23) are both fixedly connected with cams (27).

6. A filtration device for polycyclic aromatic hydrocarbon modifiers according to claim 2, characterized in that: The top of the support block (18) is fixedly connected to a second spring (19), and the top of the second spring (19) is fixedly connected to a support plate (20).

7. A filtering apparatus for polycyclic aromatic hydrocarbon modifiers according to claim 6, wherein: Protective plates (8) are fixedly connected to the top of both the front and rear ends of the support plate (20), and a triangular filter plate (21) is fixedly connected to the top of the middle end of the support plate (20).

8. The filtering apparatus for condensed polycyclic aromatic hydrocarbon modifiers of claim 7, wherein: The top of the protective plate (8) is fixedly connected to a first spring (17), and the first spring (17) is fixedly connected to the inner wall of the processing box (1).

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