Pretreatment equipment for processing regenerated fiber composite material

Abstract

The invention relates to the technical field of regenerated fiber composite materials, and discloses a pretreatment device for regenerated fiber composite material processing, the pretreatment device comprises a pretreatment box, the top of the pretreatment box is communicated with a blanking shell, the two sides of the bottom of the pretreatment box are movably connected with opening and closing plates through rotating shafts, and the opening and closing plates are convenient for personnel to collect fiber materials; through a driving motor, a first crushing roller, a second crushing roller and a gear of the crushing assembly, materials can enter the pretreatment box to be preliminarily crushed, through an adjusting rod, a movable rod and a crushing and grinding roller, the materials which are preliminarily and not completely crushed can be crushed again, the double crushing effect is achieved, the crushing quality is improved, and the crushing efficiency is improved. And the number of times of manual repeated collection and smashing is reduced, heat dissipation can be conducted on the interior of the pretreatment box through a ventilation net, meanwhile, dust of the fiber materials can be prevented from diffusing outwards, and workers can conveniently collect the completely-smashed fiber materials through an opening and closing plate.

Description

Technical Field

[0001] The invention relates to the technical field of regenerated fiber composite materials, in particular to pretreatment equipment for processing regenerated fiber composite materials. Background Art

[0002] Recycled fiber composites are a new environmentally friendly material. They are short fiber materials made from discarded plastic bottles, textiles, etc., which are recycled by physical or chemical methods and then removed of impurities. These materials have good toughness and plasticity and are widely used in automotive interiors, architectural decoration, packaging and other fields. Recycled fiber composites have many advantages, such as low price, light weight, good heat resistance, strong corrosion resistance, etc.

[0003] Recycled fiber composite materials include a glass fiber material. When the glass fiber material is reproduced and processed, pretreatment equipment is needed to perform multiple processes on the material to facilitate subsequent production and preparation. In the pretreatment process of the glass fiber material, the material needs to be crushed first. However, when a large amount of material is crushed at the same time, it is inevitable that some materials will have poor crushing effect or incomplete crushing. Therefore, the staff will have to collect and crush them again. However, since the glass fiber material is relatively small and sharp after crushing, it is very likely to cause injuries to the fingers or other parts of the body of the staff when collecting it, and there are certain safety hazards. Therefore, in order to address the above-mentioned problems, in order to solve the problem that traditional pretreatment equipment is prone to poor crushing effect or incomplete crushing when crushing a large amount of materials together, which requires the staff to collect again and poses a safety hazard, we need to propose a pretreatment equipment for processing recycled fiber composite materials. Summary of the invention

[0004] The object of the present invention is to provide a pretreatment device for processing recycled fiber composite materials to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pretreatment device for processing recycled fiber composite materials, comprising a pretreatment box, a material discharge shell connected to the top of the pretreatment box, both sides of the pretreatment box are connected to the material discharge shell, both sides of the bottom of the pretreatment box are movably connected to opening and closing plates for convenient personnel to collect fiber materials through rotating shafts, both sides of the top of the pretreatment box are provided with openings, the bottom of the front and rear sides of the inner cavity of the pretreatment box are fixedly connected to limit strips, the front and rear sides of the pretreatment box are provided with ventilation nets capable of preventing dust of fiber materials from spreading into the air, and the bottom of the front and rear sides of the inner cavity of the pretreatment box are provided with limit strips;

[0006] A guide plate arranged in the inner cavity of the pretreatment box and capable of guiding the material, wherein the guide plate is arranged in an inverted V shape;

[0007] A crushing assembly fixedly connected to the rear side of the pre-processing box can realize double crushing.

[0008] The working principle of the present invention is: first, the output end of the driving motor will make the second crushing roller and the first crushing roller rotate relative to each other through the first crushing roller cooperating with the gear of the second crushing roller, and at this time, the first crushing roller and the second crushing roller will simultaneously rotate the eccentric driving disk inside the second transmission wheel through the first transmission wheel cooperating with the first transmission belt, and at this time, the adjusting rod on the surface of the eccentric driving disk will drive the crushing and rolling roller to move back and forth left and right inside the limit bar, and then pour the glass fiber material into the pretreatment box, and at this time, the first crushing roller and the second crushing roller will perform preliminary crushing on the glass fiber material, and the crushed glass fiber material will fall to the surface of the screening plate through the guide plate to screen out impurities, and the impurities will be discharged outward, and the completely crushed material will fall to the bottom of the pretreatment box and be reciprocated by the crushing and rolling roller for further crushing. After the crushing is completed, the staff will open the opening and closing plate to collect the crushed glass fiber material and proceed to the next step.

[0009] Preferably, the crushing assembly includes a driving motor, the front side of the driving motor is fixedly connected to the pretreatment box, the output end of the driving motor passes through the inner cavity of the pretreatment box and is fixedly connected to a first crushing roller, one side of the first crushing roller is meshingly connected to a second crushing roller, and the front sides of the surfaces of the first crushing roller and the second crushing roller are both fixedly connected to gears.

[0010] By adopting the above structure, the material can be initially crushed in the pre-treatment box.

[0011] Preferably, the rear sides of the surfaces of the first crushing roller and the second crushing roller are fixedly connected with a first transmission wheel, the surface of the first transmission wheel is sleeved with a first transmission belt, the bottom of the inner cavity of the first transmission belt is movably connected with a second transmission wheel, and the inner cavity of the second transmission wheel is fixedly connected with an eccentric driving disk.

[0012] With the above structure, the driving force of the driving motor can be transmitted to the second stage of the pulverizing process.

[0013] Preferably, the front side of the eccentric driving disk is movably connected to an adjusting rod via a rotating shaft, one side of the adjusting rod is movably connected to a movable rod via a rotating shaft, a crushing and crushing roller is fixedly connected to the surface of the movable rod, the front and rear sides of the movable rod are both fixedly connected to a limiting slide, and the surface of the limiting slide is slidably connected to the inner cavity of the limiting strip.

[0014] With the above structure, the material that was not completely crushed initially can be crushed again.

[0015] Preferably, a third transmission wheel is fixedly connected to the rear side of the surface of the first crushing roller, a second transmission belt is sleeved on the surface of the third transmission wheel, a fourth transmission wheel is movably connected to one side of the inner cavity of the second transmission belt, a screw rod is fixedly connected to the inner cavity of the fourth transmission wheel, a brush plate is threadedly connected to the surface of the screw rod, the top of the brush plate contacts the first crushing roller and the second crushing roller respectively, a sliding rod is movably connected to one side of the brush plate, and the front and rear sides of the sliding rod are fixedly connected to the inner wall of the pretreatment box.

[0016] With the above structure, the brush plate can be reciprocated between the surfaces of the first crushing roller and the second crushing roller to clean the debris on the surfaces of the first crushing roller and the second crushing roller.

[0017] Preferably, a guide shell is fixedly connected to the top of the inner cavity of the pretreatment box, and the guide shell is arranged in a rectangular hollow shape.

[0018] With the above structure, the material can be guided between the first pulverizing roller and the second pulverizing roller.

[0019] Preferably, baffles are fixedly connected to the front and rear sides of the bottom of the inner cavity of the pretreatment box, and two sides of the bottom of the baffles are in contact with the opening and closing plates.

[0020] By adopting the above structure, the completely crushed materials can be limited to prevent them from being scattered in various corners at the bottom of the pretreatment box.

[0021] Preferably, a connection seat is fixedly connected to one side of the opening and closing plate, and connection blocks are fixedly connected to the bottoms of both sides of the pretreatment box, and one side of the connection block is snap-connected to the connection seat.

[0022] The above structure is used to facilitate the staff to open and close the opening and closing plate.

[0023] Preferably, the front and rear sides of the inner cavity of the pretreatment box are fixedly connected to a limit plate, a screening plate is arranged on the top of the limit plate, both sides of the front and rear sides of the screening plate are fixedly connected to a limit block, and the surface of the limit block is clamped with the top of the limit plate.

[0024] The above structure can facilitate the staff to dismantle and maintain the screening plate.

[0025] Preferably, both sides of the top of the inner cavity of the pretreatment box are fixedly connected with a guide shell, and the inner cavity of the guide shell is provided with a protective plate.

[0026] The above structure is used to guide the materials inside the pretreatment box and prevent the dust generated by the glass fiber material from scattering outward.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention uses a driving motor, a first crushing roller, a second crushing roller and gears of a crushing assembly to enable materials to enter a pretreatment box for preliminary crushing; through an adjusting rod, a movable rod and a crushing roller, materials that have not been completely crushed initially can be crushed again, thereby achieving a double crushing effect, improving the crushing quality, and reducing the number of times of repeated manual collection and crushing; through a ventilation net, the interior of the pretreatment box can be dissipated, and at the same time, dust of the fiber material can be prevented from diffusing outward; and through an opening and closing plate, workers can conveniently collect the completely crushed fiber material. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a preferred embodiment of a pretreatment device for processing regenerated fiber composite materials provided by the present invention;

[0030] Figure 2 A rear view structural schematic diagram provided by the present invention;

[0031] Figure 3 The present invention provides Figure 2 A schematic diagram of the structure enlargement at the center A;

[0032] Figure 4 A schematic diagram of the internal structure of the pretreatment box provided by the present invention;

[0033] Figure 5 A schematic diagram of the structure of the crushing assembly provided by the present invention;

[0034] Figure 6 A bottom view schematic diagram of a crushing assembly provided by the present invention;

[0035] Figure 7 A schematic diagram of the split structure of the sieve plate provided by the present invention;

[0036] Figure 8 This is a schematic structural diagram of the guide shell provided by the present invention.

[0037] In the figure: 1. pretreatment box; 2. unloading shell; 3. protection plate; 4. discharging shell; 5. crushing assembly; 501. driving motor; 502. first crushing roller; 503. second crushing roller; 504. first transmission wheel; 505. first transmission belt; 506. second transmission wheel; 507. eccentric driving disk; 508. adjusting rod; 509. movable rod; 510. crushing roller; 511. limiting slide seat; 512. gear; 513. screw rod; 514. fourth transmission wheel; 515. third transmission wheel; 516. second transmission belt; 517. sliding rod; 518. brush plate; 6. opening and closing plate; 7. ventilation net; 8. connecting seat; 9. connecting block; 10. guide shell; 11. guide shell; 12. guide plate; 13. limiting strip; 14. baffle; 15. limiting plate; 16. screening plate; 17. limiting block. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-8 As shown, a pretreatment device for processing recycled fiber composite materials includes a pretreatment box 1, the top of the pretreatment box 1 is connected to a material discharge shell 2, the material discharge shell 2 is located at the top of the pretreatment box 1, and its function is to facilitate the staff to pour the material into the pretreatment box 1, both sides of the pretreatment box 1 are connected to discharge shells 4, the discharge shells 4 are located on both sides of the pretreatment box 1, and are inclined. The function is to discharge the incompletely crushed materials outward, and both sides of the bottom of the pretreatment box 1 are movably connected to opening and closing plates 6 through a rotating shaft, and the opening and closing plates 6 are located at the bottom of the pretreatment box 1 through a rotating shaft, and their function is to discharge the completely crushed materials outward. The materials are discharged for collection by the staff. Openings are provided on both sides of the top of the pretreatment box 1. The bottoms of the front and rear sides of the inner cavity of the pretreatment box 1 are fixedly connected to limit strips 13. The front and rear sides of the pretreatment box 1 are provided with ventilation nets 7 that can prevent the dust of the fiber material from spreading into the air; a guide plate 12 is arranged in the inner cavity of the pretreatment box 1 to guide the materials. The guide plate 12 is located in the inner cavity of the pretreatment box 1, and its function is to perform two-way diversion of the materials. The guide plate 12 is arranged in an inverted V shape; a crushing component 5 is fixedly connected to the rear side of the pretreatment box 1 to achieve double crushing.

[0040] The crushing assembly 5 includes a driving motor 501, the front side of the driving motor 501 is fixedly connected to the pretreatment box 1, the output end of the driving motor 501 passes through the inner cavity of the pretreatment box 1 and is fixedly connected to the first crushing roller 502, one side of the first crushing roller 502 is meshedly connected to the second crushing roller 503, and the front sides of the surfaces of the first crushing roller 502 and the second crushing roller 503 are fixedly connected to the gear 512. Through the driving motor 501, the first crushing roller 502, the second crushing roller 503 and the gear 512, the material can be preliminarily crushed in the pretreatment box 1.

[0041] The first crushing roller 502 and the second crushing roller 503 are both fixedly connected to the rear side thereof with a first transmission wheel 504, the surface of the first transmission wheel 504 is sleeved with a first transmission belt 505, the bottom of the inner cavity of the first transmission belt 505 is movably connected to the second transmission wheel 506, the inner cavity of the second transmission wheel 506 is fixedly connected to an eccentric driving disk 507, and the driving force of the driving motor 501 can be transmitted to the second stage of the crushing process through the first transmission wheel 504, the first transmission belt 505, the second transmission wheel 506 and the eccentric driving disk 507.

[0042] The front side of the eccentric driving disk 507 is movably connected to an adjusting rod 508 via a rotating shaft, one side of the adjusting rod 508 is movably connected to a movable rod 509 via a rotating shaft, the surface of the movable rod 509 is fixedly connected to a crushing and crushing roller 510, the front and rear sides of the movable rod 509 are fixedly connected to a limiting slide 511, the surface of the limiting slide 511 is slidably connected to the inner cavity of the limiting strip 13, and the initially incompletely crushed material can be crushed again through the adjusting rod 508, the movable rod 509 and the crushing and crushing roller 510.

[0043] A third transmission wheel 515 is fixedly connected to the rear side of the surface of the first pulverizing roller 502, and a second transmission belt 516 is sleeved on the surface of the third transmission wheel 515. A fourth transmission wheel 514 is movably connected to one side of the inner cavity of the second transmission belt 516. A screw rod 513 is fixedly connected to the inner cavity of the fourth transmission wheel 514. A brush plate 518 is threadedly connected to the surface of the screw rod 513. The top of the brush plate 518 contacts the first pulverizing roller 502 and the second pulverizing roller 503 respectively. A sliding rod 517 is movably connected to one side of the brush plate 518. The front and rear sides of the sliding rod 517 are fixedly connected to the inner wall of the pretreatment box 1. Through the coordinated use of the third transmission wheel 515, the second transmission belt 516, the fourth transmission wheel 514, the screw rod 513 and the brush plate 518, the brush plate 518 can be reciprocated between the surfaces of the first pulverizing roller 502 and the second pulverizing roller 503 to clean the debris on the surfaces of the first pulverizing roller 502 and the second pulverizing roller 503.

[0044] A guide shell 11 is fixedly connected to the top of the inner cavity of the pretreatment box 1. The guide shell 11 is located at the top of the inner cavity of the pretreatment box 1 and its function is to guide the material to between the two crushing rollers. The guide shell 11 is rectangular and hollow.

[0045] The front and rear sides of the bottom of the inner cavity of the pretreatment box 1 are fixedly connected with baffles 14. The baffles 14 are located at the bottom of the pretreatment box 1. Their function is to limit the completely crushed materials to prevent them from scattering in various corners of the bottom of the pretreatment box 1. The two sides of the bottom of the baffles 14 are in contact with the opening and closing plates 6.

[0046] A connecting seat 8 is fixedly connected to one side of the opening and closing plate 6. The connecting seat 8 is located on one side of the opening and closing plate 6. Its function is to cooperate with the connecting seat 8 to facilitate the staff to open and close the opening and closing plate 6. The bottoms of both sides of the pretreatment box 1 are fixedly connected to connecting blocks 9, and one side of the connecting block 9 is snap-connected with the connecting seat 8.

[0047] The front and rear sides of the inner cavity of the pretreatment box 1 are fixedly connected to the limiting plate 15, and a screening plate 16 is arranged on the top of the limiting plate 15. The front and rear sides of the screening plate 16 are fixedly connected to the limiting blocks 17, and the surface of the limiting blocks 17 is snap-fitted to the top of the limiting plate 15. Through the limiting plate 15, the screening plate 16 and the limiting blocks 17, the staff can conveniently remove and maintain the screening plate 16.

[0048] Both sides of the top of the inner cavity of the pretreatment box 1 are fixedly connected with a guide shell 10. The guide shell 10 is located on both sides of the top of the pretreatment box 1. Its function is to guide the material poured into the pretreatment box 1 for the second time. The inner cavity of the guide shell 10 is provided with a protective plate 3. The protective plate 3 is located in the inner cavity of the guide shell 10. Its function is to prevent the dust generated by the glass limiting material from floating outward.

[0049] Working principle: First, the driving motor 501 is turned on, and the output end of the driving motor 501 will rotate through the first crushing roller 502. At this time, the gear 512 of the first crushing roller 502 will mesh with the gear 512 of the second crushing roller 503 to make the second crushing roller 503 rotate relative to the first crushing roller 502. At this time, the first crushing roller 502 and the second crushing roller 503 will simultaneously rotate the eccentric drive disk 507 inside the second transmission wheel 506 through the first transmission wheel 504 and the first transmission belt 505. At this time, the eccentric drive disk 507 The adjusting rod 508 on the surface will drive the crushing roller 510 to move back and forth inside the limit bar 13, and then the staff will pour the glass fiber material into the pre-treatment box 1 through the unloading shell 2. At this time, the glass fiber material will enter between the first crushing roller 502 and the second crushing roller 503. The first crushing roller 502 and the second crushing roller 503 will initially crush the glass fiber material. While the first crushing roller 502 and the second crushing roller 503 are crushing the glass fiber material, the third transmission wheel 515 will pass through the The second transmission belt 516 drives the screw rod 513 inside the fourth transmission wheel 514 to rotate. At this time, the brush plate 518 will sweep and clean the debris in the teeth of the first crushing roller 502 and the second crushing roller 503 at the bottom of the first crushing roller 502 and the second crushing roller 503. After the crushing, the glass fiber material will be diverted to both sides of the inner cavity of the pretreatment box 1 through the guide plate 12. At this time, the glass fiber material will fall to the surface of the screen plate 16 to screen out impurities. At this time, the impurities will pass through the inclined screen plate 16 and exit from the discharge shell 4 The crushed glass fiber material is discharged outward, while the completely crushed glass fiber material falls to the bottom of the inner cavity of the pretreatment box 1 and is crushed back and forth by the crushing and crushing roller 510 which reciprocates left and right to be further crushed. When the crushing is completed, the staff will push the connecting block 9 away from the surface of the connecting seat 8, and then open the opening and closing plate 6 to collect the crushed glass fiber material for the next step. Through the above-mentioned double crushing method, the crushing quality of the glass fiber material can be effectively improved, without the need for manual collection and repeated crushing, and at the same time, it also reduces safety hazards.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pretreatment device for processing recycled fiber composite materials, comprising a pretreatment box (1), characterized in that: Also includes: A material discharge shell (2) is connected to the top of the pretreatment box (1), and both sides of the pretreatment box (1) are connected to the material discharge shell (4). Both sides of the bottom of the pretreatment box (1) are movably connected to opening and closing plates (6) for convenient collection of fiber materials by personnel through rotating shafts. Both sides of the top of the pretreatment box (1) are provided with openings. The bottom of the front and rear sides of the inner cavity of the pretreatment box (1) are fixedly connected to limit strips (13). The front and rear sides of the pretreatment box (1) are provided with ventilation nets (7) capable of preventing dust of the fiber material from spreading into the air. A guide plate (12) is arranged in the inner cavity of the pretreatment box (1) and is capable of guiding the material, wherein the guide plate (12) is arranged in an inverted V shape; A crushing assembly (5) is fixedly connected to the rear side of the pre-processing box (1) and is capable of realizing double crushing.

2. The pretreatment equipment for processing recycled fiber composite materials according to claim 1, characterized in that: The pulverizing assembly (5) comprises a driving motor (501), the front side of the driving motor (501) is fixedly connected to the pretreatment box (1), the output end of the driving motor (501) passes through the inner cavity of the pretreatment box (1) and is fixedly connected to a first pulverizing roller (502), one side of the first pulverizing roller (502) is meshingly connected to a second pulverizing roller (503), and the front sides of the surfaces of the first pulverizing roller (502) and the second pulverizing roller (503) are fixedly connected to a gear (512).

3. The pretreatment equipment for processing recycled fiber composite materials according to claim 2, characterized in that: The rear sides of the surfaces of the first crushing roller (502) and the second crushing roller (503) are fixedly connected with a first transmission wheel (504), the surface of the first transmission wheel (504) is sleeved with a first transmission belt (505), the bottom of the inner cavity of the first transmission belt (505) is movably connected with a second transmission wheel (506), and the inner cavity of the second transmission wheel (506) is fixedly connected with an eccentric driving disk (507).

4. The pretreatment equipment for processing recycled fiber composite materials according to claim 3, characterized in that: The front side of the eccentric driving disk (507) is movably connected to an adjusting rod (508) via a rotating shaft, one side of the adjusting rod (508) is movably connected to a movable rod (509) via a rotating shaft, the surface of the movable rod (509) is fixedly connected to a crushing and crushing roller (510), the front and rear sides of the movable rod (509) are both fixedly connected to a limiting slide (511), and the surface of the limiting slide (511) is slidably connected to the inner cavity of the limiting strip (13).

5. The pretreatment equipment for processing recycled fiber composite materials according to claim 2, characterized in that: A third transmission wheel (515) is fixedly connected to the rear side of the surface of the first crushing roller (502), and a second transmission belt (516) is sleeved on the surface of the third transmission wheel (515). A fourth transmission wheel (514) is movably connected to one side of the inner cavity of the second transmission belt (516). A screw rod (513) is fixedly connected to the inner cavity of the fourth transmission wheel (514). A brush plate (518) is threadedly connected to the surface of the screw rod (513). The top of the brush plate (518) contacts the first crushing roller (502) and the second crushing roller (503) respectively. A sliding rod (517) is movably connected to one side of the brush plate (518). The front and rear sides of the sliding rod (517) are fixedly connected to the inner wall of the pretreatment box (1).

6. The pretreatment equipment for processing recycled fiber composite materials according to claim 1, characterized in that: A guide shell (11) is fixedly connected to the top of the inner cavity of the pretreatment box (1), and the guide shell (11) is arranged in a rectangular hollow shape.

7. The pretreatment equipment for processing recycled fiber composite materials according to claim 1, characterized in that: The front side and the rear side of the bottom of the inner cavity of the pretreatment box (1) are both fixedly connected with baffles (14), and the two sides of the bottom of the baffle (14) are in contact with the opening and closing plate (6).

8. The pretreatment equipment for processing recycled fiber composite materials according to claim 1, characterized in that: One side of the opening and closing plate (6) is fixedly connected to a connection seat (8), and the bottoms of both sides of the pretreatment box (1) are fixedly connected to connection blocks (9), and one side of the connection block (9) is snap-fitted to the connection seat (8).

9. The pretreatment equipment for processing recycled fiber composite materials according to claim 1, characterized in that: The front and rear sides of the inner cavity of the pretreatment box (1) are fixedly connected to a limit plate (15), a screening plate (16) is arranged on the top of the limit plate (15), and both sides of the front and rear sides of the screening plate (16) are fixedly connected to a limit block (17), and the surface of the limit block (17) is snap-fitted to the top of the limit plate (15).

10. The pretreatment equipment for processing recycled fiber composite materials according to claim 1, characterized in that: A flow guide shell (10) is fixedly connected to both sides of the top of the inner cavity of the pretreatment box (1), and a protective plate (3) is provided in the inner cavity of the flow guide shell (10).

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