Gypsum board forming belt self-cleaning system

Abstract

The invention discloses a gypsum board forming belt self-cleaning system which comprises a flushing water pipe used for spraying industrial water so as to flush, dilute and soften gypsum slurry attached to a forming belt; the slag removal lower roller is used for removing gypsum slurry attached to the forming belt; the scrubbing roller is used for cleaning residual gypsum slurry on the forming belt; and the air blowing pipe is used for blow-drying the cleaned formed belt. According to the characteristics of gypsum slurry, industrial water is sprayed out of the gypsum slurry adhered to the forming belt through the flushing water pipe, so that the gypsum slurry is softened, then the slag removal lower roller rotates, the softened gypsum slurry is separated from the forming belt, then the scrubbing roller rotates, and the gypsum slurry is removed from the forming belt through the scrubbing roller. According to the gypsum board forming belt cleaning device, residual gypsum slurry on the forming belt is brushed away, then the forming belt is blow-dried through the air blowing pipe, automatic cleaning is achieved for the complete cleaning process of the gypsum slurry, the problem that the slurry remains on the surface of the gypsum board forming belt is solved, and the cleaning effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of belt transportation, and in particular to a gypsum board molding belt self-cleaning system. Background Art

[0002] The gypsum board forming belt is an important part of the gypsum board production line. It is used to transport the wet gypsum slurry to the forming mold to form the gypsum board. The gypsum board forming belt plays the role of shaping and smoothly conveying the gypsum board.

[0003] The forming belt is responsible for conveying the mixed wet gypsum slurry from the mixer to the forming mold. During the conveying process, the slurry is evenly distributed on the belt to form a wet gypsum layer of a certain thickness. When the wet gypsum slurry forms a layer on the belt, it is extruded and formed by the mold to form a gypsum board with a certain size and shape. The forming belt plays a key role in the initial curing process of the gypsum board.

[0004] In the process of gypsum board production, it is inevitable that there will be start-ups and shutdowns. That is to say, when production is interrupted, the forming belt will be attached with gypsum slurry at the end of the gypsum board. If it is not cleaned in time, the excess gypsum slurry will affect the flatness and cleanliness of the gypsum board produced again.

[0005] Since the gypsum slurry is relatively viscous, adhesive, and easy to dry and harden, the existing scraper-type belt cleaning device is relatively easy to clean in the early stage. However, as the gypsum slurry on the scraper increases, it is difficult to completely remove the gypsum slurry attached to the molding belt, and the cleaning effect is poor. Summary of the invention

[0006] The object of the present invention is to provide a gypsum board forming belt self-cleaning system to solve the technical problem that the belt cleaning device in the prior art is difficult to completely remove the gypsum slurry on the gypsum board forming belt.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0008] A gypsum board forming belt self-cleaning system, comprising:

[0009] A flushing water pipe is used to spray industrial water to flush and dilute the gypsum slurry attached to the softening forming belt;

[0010] The lower slag cleaning roller is used to clean the gypsum slurry attached to the forming belt;

[0011] Brush roller, used to clean the residual gypsum slurry on the forming belt;

[0012] Blowing pipe, used to blow dry the cleaned forming belt;

[0013] Among them, the flushing water pipe, the lower slag cleaning roller, the brushing roller and the air blowing pipe are all arranged at the bottom of the return surface of the forming belt, and are arranged sequentially along the running direction of the forming belt. The flushing water pipe first sprays industrial water to the gypsum slurry adhered to the forming belt to soften the gypsum slurry, and then the lower slag cleaning roller rotates to separate the softened gypsum slurry from the forming belt, and then the brushing roller rotates to brush off the gypsum slurry remaining on the forming belt, and then the forming belt is blown dry through the air blowing pipe.

[0014] Furthermore, an upper slag cleaning roller is provided on the top of the lower slag cleaning roller, and the upper slag cleaning roller is used to clean the gypsum slurry on the top of the forming belt return surface. The upper slag cleaning roller and the lower slag cleaning roller are symmetrically arranged on the upper and lower sides of the forming belt return surface.

[0015] Furthermore, the lower slag cleaning roller and the upper slag cleaning roller both include a roller body, and spiral blades are fixedly connected to the outer surface of the roller body, and the lengths of the roller body and the spiral blades are both greater than the width of the forming belt.

[0016] Furthermore, the spiral directions of the spiral blades on both sides are opposite, and the roller bodies corresponding to the spiral blades with opposite thread directions are the same length. When the roller body rotates, the spiral blades transport the gypsum slurry on the forming belt to both sides of the roller body respectively, thereby cleaning the gypsum slurry on the forming belt.

[0017] Furthermore, the rotation speed of the lower slag cleaning roller is the same as that of the upper slag cleaning roller, and the rotation speed of the lower slag cleaning roller and the upper slag cleaning roller is 2-4 times the running speed of the forming belt.

[0018] Furthermore, both ends of the roller body of the slag cleaning upper roller are fixedly connected with a central shaft, and the outer surface of the central shaft is rotatably connected with a fixed block;

[0019] A frame is provided between the bearing surface of the forming belt and the return surface of the forming belt;

[0020] A spring is fixedly connected between the frame and the fixed block, and the rebound force of the spring makes the upper slag cleaning roller fit with the return surface of the forming belt.

[0021] Furthermore, the brush roller includes a center roller and bristles fixed on the outer surface of the center roller, a water trough is provided at the bottom of the brush roller, the bristles on the top of the brush roller are in contact with the forming belt, and the bristles at the bottom of the brush roller are immersed in the water trough. When the brush roller rotates, the bristles transfer the industrial water in the water trough to the bottom of the forming belt, and brush the bottom of the forming belt through the bristles.

[0022] Furthermore, the flushing direction of the flushing water pipe is opposite to the running direction of the forming belt, and the angle α between the flushing direction of the flushing water pipe and the running direction of the forming belt is 70-85°.

[0023] Furthermore, the blowing pipe is arranged along the width direction of the forming belt, and a plurality of blowing holes are opened on the blowing pipe. The direction of the gas blown out of the blowing pipe is opposite to the running direction of the forming belt, and the angle β between the direction of the gas blown out of the blowing pipe and the running direction of the forming belt is 70 to 85°.

[0024] Furthermore, a central scraper is provided upstream of the lower slag cleaning roller and the upper slag cleaning roller, the central scraper is arranged between the lower slag cleaning roller and the flushing water pipe, and the symmetry axis of the central scraper is arranged at the symmetry axis of the forming belt, and the gypsum slurry on the forming belt is divided into two parts after passing through the central scraper;

[0025] The central scraper is configured in a straight plate shape;

[0026] Or the central scraper is arranged in a V shape, and the tip of the central scraper is arranged on a side close to the flushing water pipe.

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

[0028] The present invention aims at the characteristics of gypsum slurry. First, industrial water is sprayed on the gypsum slurry adhered to the forming belt through a flushing water pipe to soften the gypsum slurry. Then, the lower slag cleaning roller rotates to separate the softened gypsum slurry from the forming belt. Then, the scrubbing roller rotates to scrub off the gypsum slurry remaining on the forming belt. Then, the forming belt is dried through an air blowing pipe. The complete cleaning process of the gypsum slurry is realized, automatic cleaning is achieved, and the problem of slurry remaining on the surface of the gypsum board forming belt is solved. The cleaning effect is good, and the cleaning effect is as high as 98%. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the lower slag cleaning roller and the upper slag cleaning roller in the present invention;

[0032] Figure 3It is a schematic structural diagram of the central scraper in the first embodiment of the present invention;

[0033] Figure 4 It is a schematic structural diagram of the central scraper in the second embodiment of the present invention.

[0034] The numbers in the figure represent the following:

[0035] 1. Flushing water pipe; 2. Lower roller for cleaning slag; 3. Brushing roller; 4. Air blowing pipe; 5. Upper roller for cleaning slag; 6. Roller body; 7. Spiral blade; 8. Center axis; 9. Fixed block; 10. Frame; 11. Spring; 12. Center roller; 13. Brush; 14. Center scraper. DETAILED DESCRIPTION

[0036] 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.

[0037] like Figure 1 and Figure 2 As shown, the present invention provides a gypsum board forming belt self-cleaning system, comprising:

[0038] A flushing water pipe 1 is used to spray industrial water to flush and dilute the gypsum slurry attached to the softening forming belt;

[0039] The lower slag cleaning roller 2 is used to clean the gypsum slurry attached to the forming belt;

[0040] The scrubbing roller 3 is used to clean the residual gypsum slurry on the forming belt;

[0041] The air blowing pipe 4 is used to blow dry the cleaned forming belt;

[0042] Among them, the flushing water pipe 1, the slag cleaning lower roller 2, the brushing roller 3 and the blowing pipe 4 are all arranged at the bottom of the return surface of the forming belt, and are arranged sequentially along the running direction of the forming belt. The flushing water pipe 1 first sprays industrial water to the gypsum slurry adhered to the forming belt to soften the gypsum slurry, and then the slag cleaning lower roller 2 rotates to separate the softened gypsum slurry from the forming belt, and then the brushing roller 3 rotates to brush off the gypsum slurry remaining on the forming belt, and then the blowing pipe 4 is used to blow dry the forming belt.

[0043] When the production of gypsum board is interrupted, the forming belt will be attached with gypsum slurry at the end of the gypsum board. If it is not cleaned in time, more gypsum slurry will affect the flatness and cleanliness of the gypsum board produced again. Since gypsum slurry is relatively viscous, adhesive, and easy to dry and harden, the existing scraper-type belt cleaning device is easier to clean in the early stage. As the gypsum slurry on the scraper increases, it is difficult to completely remove the gypsum slurry attached to the forming belt, and the cleaning effect is not good. Therefore, it is necessary to develop a gypsum board forming belt self-cleaning system.

[0044] According to the characteristics of gypsum slurry, this embodiment first uses a flushing water pipe 1 to spray industrial water on the gypsum slurry adhered to the molding belt to soften the gypsum slurry, then the slag cleaning lower roller 2 rotates to separate the softened gypsum slurry from the molding belt, and then the brushing roller 3 rotates to brush off the gypsum slurry remaining on the molding belt, and then the molding belt is dried through the air blowing pipe 4. The complete cleaning process of the gypsum slurry is realized, automatic cleaning is achieved, and the phenomenon of slurry remaining on the surface of the gypsum board molding belt is solved. The cleaning effect is good, and the cleaning effect is as high as 98%.

[0045] The start and stop of this device is controlled by the production operation signal of the gypsum board, that is to say, when the gypsum board falls off or breaks during the production process, the mixer will stop feeding, the solenoid valves on the flushing water pipe 1 and the air blowing pipe 4 will open, and the upper slag cleaning roller 5, the lower slag cleaning roller 2 and the brushing roller 3 will rotate for cleaning.

[0046] When the gypsum board production is interrupted, there will be gypsum slurry residue on the inner side of the forming belt. Although it will not affect the smoothness of the produced gypsum board, it will affect the operation of the entire system. In order to solve this problem, Figure 2 As shown, an upper slag cleaning roller 5 is provided on the top of the lower slag cleaning roller 2. The upper slag cleaning roller 5 is used to clean the gypsum slurry on the top of the return surface of the forming belt. The upper slag cleaning roller 5 and the lower slag cleaning roller 2 are symmetrically arranged on the upper and lower sides of the return surface of the forming belt. The lower slag cleaning roller 2 cleans the outer side of the forming belt, and the upper slag cleaning roller 5 cleans the inner side of the forming belt.

[0047] The above-mentioned method of cleaning both the inner and outer sides of the forming belt is a form not found in current belt cleaning structures, and is mainly designed based on the characteristics of the forming belt when producing gypsum boards.

[0048] Specifically, the specific structures of the lower slag cleaning roller 2 and the upper slag cleaning roller 5 are described in detail below. The lower slag cleaning roller 2 and the upper slag cleaning roller 5 both include a roller body 6, and a spiral blade 7 is fixedly connected to the outer surface of the roller body 6. The lengths of the roller body 6 and the spiral blade 7 are both greater than the width of the forming belt. The forming belt is constantly running. When the gypsum slurry on the forming belt reaches the position of the lower slag cleaning roller 2 and the upper slag cleaning roller 5, the roller body 6 rotates to drive the spiral blade 7 to rotate, and the rotating spiral blade 7 transfers the gypsum slurry on the forming belt to the outside of the forming belt.

[0049] The lengths of the roller body 6 and the spiral blades 7 are both greater than the width of the forming belt, so that the gypsum slurry on the forming belt is completely transferred to the side of the forming belt.

[0050] If the spiral blades 7 on the outer surface of the roller body 6 are all left-handed or right-handed, the gypsum slurry on the forming belt will be uniformly moved to one side of the forming belt. The gypsum slurry is transported over a long distance and the forming belt is easily deflected. In order to solve this problem, Figure 2 As shown, the spiral directions of the spiral blades 7 on both sides are opposite, and the roller body 6 corresponding to the spiral blades 7 with opposite thread directions have the same length. When the roller body 6 rotates, the spiral blades 7 transport the gypsum slurry on the molding belt to both sides of the roller body 6 respectively, thereby cleaning the gypsum slurry on the molding belt.

[0051] The special spiral design on the upper slag cleaning roller 5 and the lower slag cleaning roller 2 enables the gypsum slurry in the middle of the forming belt to be transported to the outer edges of both sides of the forming belt in sequence until it falls, thereby cleaning the gypsum slurry on the forming belt. The moving distance of the gypsum slurry on the forming belt is shorter, which saves more time than the method in which the spirals are all left-handed or all right-handed, and it is easier to ensure that the forming belt is not tilted by the running direction of this roller, resulting in the belt deviation phenomenon.

[0052] In order to improve the efficiency of cleaning gypsum slurry without reducing the cleaning effect of gypsum slurry, further, the rotation speed of the slag cleaning lower roller 2 is the same as that of the slag cleaning upper roller 5, and the rotation speed of the slag cleaning lower roller 2 and the slag cleaning upper roller 5 is 2-4 times the running speed of the forming belt.

[0053] A central shaft 8 is fixedly connected to both ends of the roller body 6 of the slag cleaning upper roller 5, and a fixed block 9 is rotatably connected to the outer surface of the central shaft 8;

[0054] A frame 10 is provided between the bearing surface of the forming belt and the return surface of the forming belt;

[0055] A spring 11 is fixedly connected between the frame 10 and the fixed block 9 , and the rebound force of the spring 11 makes the upper slag cleaning roller 5 fit with the return surface of the forming belt.

[0056] By providing the spring 11, the upper slag cleaning roller 5 and the lower slag cleaning roller 2 are respectively pressed against the two sides of the forming belt, so that the gypsum slurry on the forming belt is in close contact with the upper slag cleaning roller 5 and the lower slag cleaning roller 2, thereby improving the effect of cleaning the gypsum slurry.

[0057] The structure of the scrubbing roller 3 is described in detail below. The scrubbing roller 3 includes a center roller 12 and bristles 13 fixed on the outer surface of the center roller 12. A water tank is provided at the bottom of the scrubbing roller 3. The bristles 13 at the top of the scrubbing roller 3 are in contact with the forming belt. The bristles 13 at the bottom of the scrubbing roller 3 are immersed in the water tank. When the scrubbing roller 3 rotates, the bristles 13 transfer the industrial water in the water tank to the bottom of the forming belt, and scrub the bottom of the forming belt through the bristles 13. The upper slag cleaning roller 5 and the lower slag cleaning roller 2 can clean most of the gypsum slurry on the forming belt, but a small amount of gypsum slurry will remain on the forming belt. In order to improve the cleaning effect, the bottom of the forming belt is scrubbed by the rotating scrubbing roller 3. The rotating bristles 13 dip the industrial water in the water tank and throw it on the forming belt, and then scrub it with the rotating brush to clean the remaining gypsum slurry.

[0058] The flushing direction of the flushing water pipe 1 is opposite to the running direction of the forming belt, and the angle α between the flushing direction of the flushing water pipe 1 and the running direction of the forming belt is 70-85°.

[0059] The flushing angle of the flushing water pipe 1 is inclined toward the direction in which the belt travels. When the running speed of the molding belt and the flushing speed of the flushing water pipe 1 cooperate with each other, the flushing effect of the gypsum slurry on the molding belt is improved.

[0060] The blowing pipe 4 is arranged along the width direction of the forming belt, and a plurality of blowing holes are provided on the blowing pipe 4. The direction of the gas blown out of the blowing pipe 4 is opposite to the running direction of the forming belt, and the angle β between the direction of the gas blown out of the blowing pipe 4 and the running direction of the forming belt is 70-85°. With the above special angle setting, the relative speed between the gas and the forming belt increases, and the contact time between the gas and the belt surface is longer, so that the collision between the gas molecules and the moisture on the forming belt is more frequent, and this collision helps to transfer momentum faster, thereby more effectively taking away the moisture and improving the drying effect.

[0061] Meanwhile, the gas blown out by the air blowing pipe 4 can promote the water droplets on the forming belt to move in the direction opposite to the forming belt running direction, reducing the residue of the water droplets. If the direction of the gas blown out in the air blowing pipe 4 is the same as the forming belt running direction, then the moisture residue is more.

[0062] The outer surface of the forming belt is kept dry, so the gypsum board will not have uneven surface on the forming belt, and there may even be slurry on the surface of the gypsum board that contacts the forming belt, thereby improving the appearance quality of the finished product.

[0063] The lower slag cleaning roller 2 and the upper slag cleaning roller 5 are used to move the gypsum slurry in the middle of the forming belt to both sides. In actual use, gypsum slurry will remain in the middle of the forming belt. In order to solve this problem, Figure 1 As shown, a central scraper 14 is provided upstream of the lower slag cleaning roller 2 and the upper slag cleaning roller 5. The central scraper 14 is arranged between the lower slag cleaning roller 2 and the flushing water pipe 1, and the symmetry axis of the central scraper 14 is arranged at the symmetry axis of the forming belt. The gypsum slurry on the forming belt is divided into two parts after passing through the central scraper 14.

[0064] The gypsum slurry on the forming belt is divided into two parts after passing through the central scraper 14, and is then transported to both sides by the lower slag cleaning roller 2 and the upper slag cleaning roller 5.

[0065] The first embodiment, as Figure 3 As shown, specifically, the central scraper 14 is set to be a straight plate shape. The gypsum slurry on the forming belt is divided into two parts after passing through the central scraper 14, which is conducive to the subsequent slag cleaning lower roller 2 and slag cleaning upper roller 5 to clean the gypsum slurry on the forming belt.

[0066] The second embodiment, as Figure 4 As shown, specifically, the central scraper 14 is set to be V-shaped, and the tip of the central scraper 14 is set on the side close to the flushing water pipe 1. The gypsum slurry on the forming belt is divided into two parts after passing through the central scraper 14, which is conducive to the subsequent slag cleaning lower roller 2 and slag cleaning upper roller 5 to clean the gypsum slurry on the forming belt.

[0067] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A gypsum board forming belt self-cleaning system, characterized in that: include: A flushing water pipe (1) is used to spray industrial water to flush and dilute the gypsum slurry attached to the softening forming belt; A slag cleaning lower roller (2) is used to clean the gypsum slurry attached to the forming belt; A scrubbing roller (3) is used to clean the residual gypsum slurry on the forming belt; An air blowing pipe (4) is used to blow dry the cleaned forming belt; The flushing water pipe (1), the lower slag cleaning roller (2), the scrubbing roller (3) and the air blowing pipe (4) are all arranged at the bottom of the return surface of the forming belt and are arranged in sequence along the running direction of the forming belt. The flushing water pipe (1) first sprays industrial water to the gypsum slurry adhering to the forming belt to soften the gypsum slurry. Then the lower slag cleaning roller (2) rotates to separate the softened gypsum slurry from the forming belt. Then the scrubbing roller (3) rotates to scrub off the gypsum slurry remaining on the forming belt. Then the air blowing pipe (4) is used to dry the forming belt.

2. A gypsum board forming belt self-cleaning system according to claim 1, characterized in that: An upper slag cleaning roller (5) is provided on the top of the lower slag cleaning roller (2), and the upper slag cleaning roller (5) is used to clean the gypsum slurry on the top of the return surface of the forming belt. The upper slag cleaning roller (5) and the lower slag cleaning roller (2) are symmetrically arranged on the upper and lower sides of the return surface of the forming belt.

3. A gypsum board forming belt self-cleaning system according to claim 2, characterized in that: The lower slag cleaning roller (2) and the upper slag cleaning roller (5) both comprise a roller body (6), a spiral blade (7) being fixedly connected to the outer surface of the roller body (6), and the lengths of the roller body (6) and the spiral blade (7) are both greater than the width of the forming belt.

4. A gypsum board forming belt self-cleaning system according to claim 3, characterized in that: The spiral directions of the spiral blades (7) on both sides are opposite, and the roller bodies (6) corresponding to the spiral blades (7) with opposite spiral directions have the same length. When the roller body (6) rotates, the spiral blades (7) transport the gypsum slurry on the molding belt to both sides of the roller body (6), thereby cleaning the gypsum slurry on the molding belt.

5. A gypsum board forming belt self-cleaning system according to claim 4, characterized in that: The rotation speed of the lower slag cleaning roller (2) is the same as that of the upper slag cleaning roller (5), and the rotation speed of the lower slag cleaning roller (2) and the upper slag cleaning roller (5) is 2-4 times the running speed of the forming belt.

6. A gypsum board forming belt self-cleaning system according to claim 5, characterized in that: A central shaft (8) is fixedly connected to both ends of the roller body (6) of the slag cleaning upper roller (5), and a fixed block (9) is rotatably connected to the outer surface of the central shaft (8); A frame (10) is provided between the bearing surface of the forming belt and the return surface of the forming belt; A spring (11) is fixedly connected between the frame (10) and the fixed block (9), and the rebound force of the spring (11) enables the slag cleaning upper roller (5) to fit the return surface of the forming belt.

7. A gypsum board forming belt self-cleaning system according to claim 6, characterized in that: The scrubbing roller (3) comprises a central roller (12) and bristles (13) fixed on the outer surface of the central roller (12); a water tank is provided at the bottom of the scrubbing roller (3); the bristles (13) at the top of the scrubbing roller (3) are in contact with the forming belt, and the bristles (13) at the bottom of the scrubbing roller (3) are immersed in the water tank; when the scrubbing roller (3) rotates, the bristles (13) transfer the industrial water in the water tank to the bottom of the forming belt, and scrub the bottom of the forming belt through the bristles (13).

8. A gypsum board forming belt self-cleaning system according to claim 7, characterized in that: The flushing direction of the flushing water pipe (1) is opposite to the running direction of the forming belt, and the angle α between the flushing direction of the flushing water pipe (1) and the running direction of the forming belt is 70-85°.

9. A gypsum board forming belt self-cleaning system according to claim 8, characterized in that: The air blowing pipe (4) is arranged along the width direction of the forming belt, and a plurality of air blowing holes are provided on the air blowing pipe (4). The direction of the air blowing out of the air blowing pipe (4) is opposite to the running direction of the forming belt, and the angle β between the direction of the air blowing out of the air blowing pipe (4) and the running direction of the forming belt is 70 to 85°.

10. A gypsum board forming belt self-cleaning system according to claim 9, characterized in that: A central scraper (14) is provided upstream of the lower slag cleaning roller (2) and the upper slag cleaning roller (5), the central scraper (14) is arranged between the lower slag cleaning roller (2) and the flushing water pipe (1), and the symmetry axis of the central scraper (14) is arranged at the symmetry axis of the forming belt, and the gypsum slurry on the forming belt is divided into two parts after passing through the central scraper (14); The central scraper (14) is configured as a straight plate; Or the central scraper (14) is arranged in a V shape, and the tip of the central scraper (14) is arranged on a side close to the flushing water pipe (1).

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