Barite processing wastewater fine material recovery device

Abstract

The utility model discloses a barite processing wastewater fine material recovery device belongs to barite recovery technical field, including fixed bolster, filter zone, the inside movable joint of fixed bolster has two parallel drive roller, and the filter zone is connected with tail and is around and is equipped outside two drive roller, and one end of drive roller is equipped with the drive structure of making drive roller and filter zone synchronous rotation, and the filter zone surface is equipped with a plurality of filter holes, the filter zone is close to below and is equipped with the wastewater tank of opening upwards, and the wastewater guide plate is equipped above the wastewater tank, and the filter zone inboard is equipped with the filtrate groove of opening upwards and with fixed bolster fixed connection, the filter zone below is equipped with the solid guide plate with fixed bolster fixed connection, the utility model discloses can keep higher efficiency to the wastewater containing barite powder carries out solid -liquid separation and obtains barite fine material after, is favorable to the efficiency of barite recovery.

Description

Technical Field

[0001] This utility model relates to the field of barite recycling technology, specifically to a device for recycling fine materials from barite processing wastewater. Background Technology

[0002] Barite is an important non-metallic mineral raw material, with barium sulfate as its main chemical component. The processing of barite typically includes crushing, grinding, washing, and flotation to obtain barite powder products of different specifications and purities. During the barite processing, wastewater containing a large number of solid particles is generated. This wastewater contains many very fine, micron-sized barite particles. By using appropriate technical means, these valuable barite fines can be extracted from the wastewater for recycling, thus avoiding the waste of mineral resources.

[0003] Based on the above, Chinese patent document CN209221591U discloses an environmentally friendly barite powder recycling device, including an inlet pipe and a water pump. The water pump is fixedly connected to the right side of the inlet pipe, and a delivery pipe is fixedly installed at the output end of the water pump. A water valve is fixedly installed on the right side of the inlet pipe, and a one-way valve is fixedly installed on the left side of the inner wall of the inlet pipe. A filter screen is fixedly installed on the inner wall of the inlet pipe, located to the right of the one-way valve. A through pipe is fixedly installed through the upper surface of the inlet pipe, and a nozzle is fixedly installed on the left side of the through pipe, with the nozzle located inside the inlet pipe. An anti-coagulation device is fixedly installed through the upper surface of the inlet pipe, located to the left of the through pipe. A dirt removal pipe is connected to the lower end of the inlet pipe, and a retaining ring is fixedly installed on the inner ring surface of the dirt removal pipe. A discharge device is fixedly installed on the inner wall of the dirt removal pipe, and the retaining ring is engaged with the discharge device.

[0004] The aforementioned patent document discloses an apparatus for recovering barite from wastewater containing barite powder. However, this apparatus has the following problems in practical applications: due to the high barite content in the wastewater containing barite powder, the barite powder is easily stuck in the mesh of the filter screen during the filtration process, resulting in increasingly lower filtration efficiency. Furthermore, it is difficult to recover the solids trapped by the filter screen during continuous operation of the water pump. Therefore, it is evident that the barite powder recovery apparatus in the aforementioned patent document still has room for improvement. Utility Model Content

[0005] To address the technical deficiencies in the background technology, this utility model proposes a device for recovering fine particles from barite processing wastewater, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows: A device for recovering fine materials from barite processing wastewater includes a fixed support and a filter belt. Two parallel drive rollers are movably connected inside the fixed support. The filter belt is connected end to end and wrapped around the outside of the two drive rollers. One of the drive rollers has a drive structure at its end that enables the drive roller and the filter belt to rotate synchronously. The surface of the filter belt has a plurality of filter holes. The filter belt has an upward-opening wastewater tank on the side below one of the drive rollers. Above the wastewater tank is a wastewater guide plate that extends downward from above the filter belt to near the top surface of the outer side of the filter belt. The filter belt has an upward-opening filtrate tank that is fixedly connected to a fixed bracket. Below the filter belt is a solid guide plate that is fixedly connected to the fixed bracket. One end of the solid guide plate is close to the wastewater tank, and the other end extends downward at an angle.

[0006] As a further technical solution of this utility model, both ends of the drive roller are provided with drive shafts that are movably connected to the fixed bracket, and one drive shaft at one end of the drive roller is movably connected to the drive structure. A drive sprocket is provided on the surface of the drive shaft at the same end of the two drive rollers, and a drive chain is wound around the outer side of the two drive sprockets.

[0007] As a further technical solution of this utility model, the fixed bracket is provided with a connecting crossbeam located above the filter belt, and a stirring mechanism is provided between the connecting crossbeam and the filter belt. The stirring mechanism includes the following structure: a stirring shaft movably connected to the connecting crossbeam, the stirring shaft passing through the connecting crossbeam in the vertical direction, and a plurality of stirring scrapers provided at the bottom of the stirring shaft, the bottom of the stirring scrapers abutting against the top surface of the outer side of the filter belt. A transmission mechanism is provided between the end of the stirring shaft and the drive structure to rotate the stirring shaft and the stirring scraper.

[0008] As a further technical solution of this utility model, the transmission mechanism includes the following structure: a transmission shaft rod, which runs horizontally above the filter belt and is movably connected to the fixed bracket; two first transmission sprockets, which are respectively located at the end of one of the drive rollers and the end of the transmission shaft rod; a first transmission chain is wound around the outer sides of the two first transmission sprockets; a first helical gear, which is fixedly connected to the transmission shaft rod; and a second helical gear that meshes with the first helical gear at the top of the stirring shaft rod.

[0009] As a further technical solution of this utility model, at least two sets of stirring mechanisms are provided above the filter belt, and the transmission mechanism is provided with two transmission shafts that are respectively matched with the two sets of stirring mechanisms. Each transmission shaft has a second transmission sprocket at its end, and a second transmission chain is wound around the outer side of the two second transmission sprockets.

[0010] As a further technical solution of this utility model, the stirring mechanism is provided with at least two stirring shafts that are movably connected to the connecting crossbeam, and each stirring shaft is provided with several stirring scrapers at its bottom.

[0011] As a further technical solution of this utility model, the inner side of the filter belt is provided with a vibration structure fixedly connected to the fixed bracket. The vibration structure is located above the solid guide plate. At least two vibration rollers are movably connected to the bottom of the vibration structure. The bottom of the vibration rollers abuts against the bottom of the inner side of the filter belt. The rotation direction of the vibration rollers is consistent with the rotation direction of the filter belt.

[0012] As a further technical solution of this utility model, the outer surface of the filter belt is provided with a filter groove, the filter groove is connected end to end and extends along the rotation direction of the filter belt, and a plurality of filter holes penetrate from the bottom of the filter groove to the inner side of the filter belt.

[0013] As a further technical solution of this utility model, the top surface of the wastewater guide plate is provided with a wastewater guide groove extending along the rotation direction of the filter belt, and the top surface of the solid guide plate is provided with a solid guide groove extending along the rotation direction of the filter belt.

[0014] The beneficial effects of this utility model are as follows: This invention discloses a recovery device for recovering barite fines from wastewater containing barite powder. The recovery device uses a rotating filter belt to perform solid-liquid separation on the wastewater. The water in the wastewater passes through the filter holes on the top surface of the filter belt and enters the filtrate tank. After the water is filtered out, the remaining solid powder is conveyed by the filter belt and falls onto the surface of the solid guide plate, and is then conveyed to the next process. This invention can maintain high efficiency in solid-liquid separation of wastewater containing barite powder to obtain barite fines, which is beneficial to improving the efficiency of barite recovery. Attached Figure Description

[0015] Figure 1 A schematic diagram of a device for recovering fine particles from barite processing wastewater. Figure 1 .

[0016] Figure 2 A schematic diagram of a device for recovering fine particles from barite processing wastewater. Figure 2 .

[0017] Figure 3 This is a front view of a device for recovering fine particles from wastewater in barite processing.

[0018] Wherein: 1-fixed bracket, 11-filtrate tank, 12-solid guide plate, 13-connecting crossbeam, 14-solid guide channel, 15-filtrate pipe, 2-filter belt, 21-filter groove, 3-drive roller, 31-drive shaft, 32-drive sprocket, 33-drive chain, 4-wastewater tank, 41-wastewater guide plate, 42-wastewater guide channel, 5-stirring mechanism, 51-stirring shaft, 52-stirring scraper, 6-transmission mechanism, 61-transmission shaft, 62-first transmission sprocket, 63-first transmission chain, 64-first helical gear, 65-second helical gear, 66-second transmission sprocket, 67-second transmission chain, 7-vibration structure, 71-vibration roller. Detailed Implementation

[0019] The embodiments of this utility model will be described below with reference to the accompanying drawings and related examples. The embodiments of this utility model are not limited to the following examples, and this utility model relates to relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0020] A device for recovering fine materials from barite processing wastewater includes a fixed support 1 and a filter belt 2. Two parallel drive rollers 3 are movably connected inside the fixed support 1. The filter belt 2 is connected end to end and wrapped around the outside of the two drive rollers 3. One of the drive rollers 3 has a drive structure at its end that enables the drive roller 3 and the filter belt 2 to rotate synchronously. The surface of the filter belt 2 has a number of filter holes. The filter belt 2 has an upward-facing wastewater tank 4 located below one of the drive rollers 3. Above the wastewater tank 4 is a wastewater guide plate 41 that extends downward from above the filter belt 2 to near the top surface of the outer side of the filter belt 2. The filter belt 2 has an upward-facing filtrate tank 11 that is fixedly connected to the fixed bracket 1. Below the filter belt 2 is a solid guide plate 12 that is fixedly connected to the fixed bracket 1. One end of the solid guide plate 12 is close to the wastewater tank 4, and the other end extends downward at an angle.

[0021] This utility model discloses a recovery device for recovering fine barite from wastewater containing barite powder, with reference to... Figure 1 , Figure 2 , Figure 3The recycling device mainly consists of a fixed bracket 1, a filter belt 2, a drive roller 3, and a drive structure. The fixed bracket 1 is mainly used to install and fix components such as the filter belt 2, the drive roller 3, and the drive structure. The filter belt 2, the drive roller 3, and the drive structure together form a structure similar to a conveyor belt. The filter belt 2 is a strip-shaped material with connected ends, made of a composite of synthetic rubber and other materials with a high surface friction coefficient and a filter screen. The filter holes on the surface of the filter belt 2 are the same as the filter holes on the surface of the filter screen. The drive structure is preferably a servo motor. The drive structure is used to make the drive roller 3 rotate. When the drive roller 3 rotates, the friction between its surface and the synthetic rubber of the filter belt 2 drives the filter belt 2 to rotate synchronously, so that the filter belt 2 can achieve a rotation mode similar to a transmission belt. The top surface of the outer side of the filter belt 2 moves away from the wastewater guide plate 41. Based on the above structure, wastewater containing barite powder is pumped and piped to the side of the wastewater guide plate 41 away from the filter belt 2. The wastewater flows downward along the top surface of the wastewater guide plate 41 to the outer top surface of the filter belt 2. The water in the wastewater gradually penetrates the filter holes and enters the filtrate tank 11 inside the filter belt 2. A filtrate pipe 15 is provided on one side of the filtrate tank 11 to guide the water to flow outward. The solid powder in the wastewater will be transported away from the wastewater guide plate 41 as the filter belt 2 rotates, thereby achieving solid-liquid separation of the wastewater. When the solid powder is transported to the end of the filter belt 2 away from the wastewater guide plate 41, it will fall down to the top surface of the solid guide plate 12 and continue to move away from the wastewater guide plate 41. A transmission belt for transporting solid powder is provided below the end of the solid guide plate 12 away from the wastewater guide plate 41. The solid powder is transported to the next process to remove residual water by drying or pressure filtration to obtain barite fines. It should be noted that some of the wastewater flowing from the wastewater guide plate 41 to the top surface of the filter belt 2 may drip down from the end of the filter belt 2 near the wastewater guide plate 41. At this time, the wastewater tank 4 can contain this part of the wastewater to prevent it from dripping onto the ground. The wastewater tank 4 can be periodically pumped out by a water pump and transported to the top surface of the wastewater guide plate 41, where it will flow to the top surface of the filter belt 2 again for solid-liquid separation.

[0022] Furthermore, referring to Figure 1 , Figure 2Both ends of the drive roller 3 are provided with drive shafts 31 that are movably connected to the fixed bracket 1. One end of the drive shaft 31 of the drive roller 3 is movably connected to the drive structure. A bearing is provided between the drive shaft 31 and the fixed bracket 1 so that the drive shaft 31 can rotate smoothly. The surface of the drive shaft 31 located at the same end of the two drive rollers 3 is provided with drive sprockets 32. A drive chain 33 is wound around the outer side of the two drive sprockets 32. When the drive structure makes one of the drive rollers 3 rotate, it will drive the drive sprocket 32 ​​connected to the drive roller 3 to rotate, and make the drive chain 33 rotate synchronously. The rotating drive chain 33 will drive the drive sprocket 32 ​​at the end of the other drive roller 3 to rotate synchronously, so that the two drive rollers 3 rotate synchronously and drive the filter belt 2 to rotate.

[0023] Furthermore, referring to Figure 1 , Figure 2 The fixed bracket 1 is provided with a connecting beam 13 located above the filter belt 2. A stirring mechanism 5 is provided between the connecting beam 13 and the filter belt 2. The stirring mechanism 5 includes the following structure: a stirring shaft 51 movably connected to the connecting beam 13, the stirring shaft 51 passing through the connecting beam 13 in the vertical direction, a plurality of stirring scrapers 52 provided at the bottom of the stirring shaft 51, the bottom of the stirring scrapers 52 abutting against the top surface of the outer side of the filter belt 2; and a transmission mechanism 6 is provided between the end of the stirring shaft 51 and the driving structure to rotate the stirring shaft 51 and the stirring scrapers 52. When the stirring shaft 51 rotates, it will drive several stirring scrapers 52 at its bottom to rotate on the top of the filter belt 2. The stirring scrapers 52 stir the solid powder on the top surface of the filter belt 2 by rotating, which can prevent the solid powder from depositing on the top surface of the filter belt 2 and forming a thick solid powder layer. This ensures that water can efficiently penetrate the filter belt 2 and enter the filtrate tank 11, which is beneficial to reducing the water content in the solid powder after solid-liquid separation. Furthermore, referring to Figure 1 , Figure 2 The transmission mechanism 6 includes the following structure: a transmission shaft 61, which runs across the filter belt 2 and is movably connected to the fixed bracket 1. A bearing is provided between the transmission shaft 61 and the fixed bracket 1 so that the transmission shaft 61 can rotate smoothly; two first transmission sprockets 62, which are respectively located at the end of one of the drive rollers 3 and the end of the transmission shaft 61; a first transmission chain 63 is wound around the outer sides of the two first transmission sprockets 62; a first helical gear 64, which is fixedly connected to the transmission shaft 61; and a second helical gear 65 that meshes with the first helical gear 64 at the top of the stirring shaft 51. With the above-mentioned transmission mechanism 6, the drive structure can rotate the drive roller 3 and the stirring mechanism 5 at the same time. When the drive structure rotates the drive shaft 31, it will drive the first transmission sprocket 62 in the drive shaft 31 to rotate, thereby simultaneously driving the first transmission chain 63, the transmission shaft 61 and the first transmission sprocket 62 at its end to rotate. When the transmission shaft 61 rotates, it will drive the first helical gear 64 to rotate. The first helical gear 64 will drive the second helical gear 65 to rotate through meshing transmission and drive the stirring shaft 51 to rotate, thereby realizing the rotation of the stirring mechanism 5 and stirring the solid powder on the surface of the filter belt 2. Furthermore, referring to Figure 1 , Figure 2 At least two sets of stirring mechanisms 5 are provided above the filter belt 2. After setting at least two sets of stirring mechanisms 5 distributed along the length of the filter belt 2, the solid powder will be stirred by the two sets of stirring mechanisms 5 in sequence during the conveying process on the top surface of the filter belt 2, so that the solid powder is stirred more thoroughly. The transmission mechanism 6 is provided with two transmission shafts 61 that are matched with the two sets of stirring mechanisms 5 respectively. Each transmission shaft 61 is provided with a second transmission sprocket 66 at its end. The outer sides of the two second transmission sprockets 66 are together wrapped with a second transmission chain 67. When the transmission shaft 61 with a first transmission sprocket 62 at its end rotates, it will drive the second transmission sprocket 66 at its end to rotate and drive the other transmission shaft 61 and its second transmission sprocket 66 at its end to rotate through the second transmission chain 67. The two stirring mechanisms 5 rotate simultaneously through the meshing of the first helical gear 64 and the second helical gear 65 on the surface of the two transmission shafts 61. Furthermore, referring to Figure 1 , Figure 2 The stirring mechanism 5 is provided with at least two stirring shafts 51 that are movably connected to the connecting crossbeam 13. Each stirring shaft 51 has several stirring scrapers 52 at its bottom and a second helical gear 65 at its top. The number and position of the first helical gears 64 on the surface of the transmission shaft 61 match the second helical gears 65. With the above structure, the stirring mechanism 5 can cover the width of the filter belt 2 through several sets of stirring shafts 51 and stirring scrapers 52, so that the stirring mechanism 5 can stir most of the solid powder located on the top surface of the filter belt 2, thereby improving the stirring effect of the stirring mechanism 5 on the solid powder and helping to reduce the water content in the solid powder after solid-liquid separation.

[0024] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 2 , Figure 3The filter belt 2 has a vibration structure 7 fixedly connected to the fixed bracket 1 on its inner side. The vibration structure 7 is located above the solid guide plate 12. At least two vibration rollers 71 are movably connected to the bottom of the vibration structure 7. The bottom of the vibration rollers 71 abuts against the bottom of the inner side of the filter belt 2. The rotation direction of the vibration rollers 71 is the same as the rotation direction of the filter belt 2. The vibration structure 7 is preferably an ultrasonic vibrator. When the vibration structure 7 is working, it will transmit the vibration to the bottom of the filter belt 2 through the vibration rollers 71. The vibration rollers 71 can avoid affecting the normal rotation of the filter belt 2 by rotating and keep the two in contact with each other. After the vibration is transmitted, the filter belt 2 will vibrate. The vibration will cause the solid powder stuck in the filter holes to separate from each other, so that these solid powders can fall to the top surface of the solid guide plate 12, which can keep the filter holes unobstructed and help the filter belt 2 maintain a high filtration efficiency.

[0025] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 2 The outer surface of the filter belt 2 is provided with a filter groove 21. The filter groove 21 is connected end to end and extends along the rotation direction of the filter belt 2. Several filter holes penetrate from the bottom of the filter groove 21 to the inner side of the filter belt 2. The filter groove 21 makes the surface of the filter belt 2 form a structure that can accommodate wastewater and solid powder, and prevents wastewater from flowing outward from the side of the filter belt 2 in the width direction.

[0026] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 2 The top surface of the wastewater guide plate 41 is provided with a wastewater guide groove 42 extending along the rotation direction of the filter belt 2. The wastewater guide groove 42 is used to guide the wastewater to flow in a directional manner and prevent the wastewater from flowing to the outside of the two sides of the wastewater guide plate 41. The top surface of the solid guide plate 12 is provided with a solid guide groove 14 extending along the rotation direction of the filter belt 2. The solid guide groove 14 is used to guide the solid powder to slide in a directional manner and prevent the solid powder from sliding to the outside of the two sides of the solid guide plate 12.

[0027] In summary, this utility model discloses a recovery device for recovering barite fines from wastewater containing barite powder. This recovery device uses a rotating filter belt 2 to perform solid-liquid separation on the wastewater. The water in the wastewater passes through the filter holes on the top surface of the filter belt 2 and enters the filtrate tank 11. After the water is filtered out, the remaining solid powder is conveyed by the filter belt 2 and falls onto the surface of the solid guide plate 12, and is then conveyed to the next process. This utility model can maintain high efficiency in solid-liquid separation of wastewater containing barite powder to obtain barite fines, which is beneficial to improving the efficiency of barite recovery.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for recovering fine particles from barite processing wastewater, comprising a fixed support (1) and a filter belt (2), characterized in that, The fixed bracket (1) is movably connected to two parallel drive rollers (3). The filter belt (2) is connected end to end and wrapped around the outside of the two drive rollers (3). One of the drive rollers (3) has a drive structure at its end that makes the drive roller (3) and the filter belt (2) rotate synchronously. The surface of the filter belt (2) has several filter holes. The filter belt (2) has an upward-opening wastewater tank (4) on one side below one of the drive rollers (3). Above the wastewater tank (4) is a wastewater guide plate (41) that extends downward from above the filter belt (2) to near the top surface of the outer side of the filter belt (2). The filter belt (2) has an upward-opening filtrate tank (11) that is fixedly connected to the fixed bracket (1). Below the filter belt (2) is a solid guide plate (12) that is fixedly connected to the fixed bracket (1). One end of the solid guide plate (12) is close to the wastewater tank (4), and the other end extends downward at an angle.

2. The barite processing wastewater fine material recovery device according to claim 1, characterized in that, Both ends of the drive roller (3) are provided with drive shafts (31) that are movably connected to the fixed bracket (1), and one drive shaft (31) at one end of the drive roller (3) is movably connected to the drive structure. The drive shaft (31) located at the same end of the two drive rollers (3) is provided with drive sprockets (32), and a drive chain (33) is wound around the outside of the two drive sprockets (32).

3. The barite processing wastewater fine material recovery device according to claim 1, characterized in that, The fixed bracket (1) is provided with a connecting beam (13) located above the filter belt (2). A stirring mechanism (5) is provided between the connecting beam (13) and the filter belt (2). The stirring mechanism (5) includes the following structure: a stirring shaft (51) movably connected to the connecting beam (13), the stirring shaft (51) passing through the connecting beam (13) in the vertical direction, and a plurality of stirring scrapers (52) provided at the bottom of the stirring shaft (51). The bottom of the stirring scrapers (52) abuts against the outer top surface of the filter belt (2). A transmission mechanism (6) is provided between the end of the stirring shaft (51) and the drive structure to rotate the stirring shaft (51) and the stirring scraper (52).

4. The barite processing wastewater fine material recovery device according to claim 3, characterized in that, The transmission mechanism (6) includes the following structure: a transmission shaft (61) that runs across the filter belt (2) and is movably connected to the fixed bracket (1); a first transmission sprocket (62) that has two sprockets and is respectively located at the end of one of the drive rollers (3) and the end of the transmission shaft (61); a first transmission chain (63) that is wound around the outer sides of the two first transmission sprockets (62); a first helical gear (64) that is fixedly connected to the transmission shaft (61); and a second helical gear (65) that meshes with the first helical gear (64) at the top of the stirring shaft (51).

5. The barite processing wastewater fine material recovery device according to claim 4, characterized in that, At least two sets of stirring mechanisms (5) are provided above the filter belt (2). The transmission mechanism (6) is provided with two transmission shafts (61) that are respectively matched with the two sets of stirring mechanisms (5). Each transmission shaft (61) is provided with a second transmission sprocket (66) at its end. A second transmission chain (67) is wound around the outer side of the two second transmission sprockets (66).

6. The barite processing wastewater fine material recovery device according to claim 3, characterized in that, The stirring mechanism (5) is provided with at least two stirring shafts (51) that are movably connected to the connecting beam (13), and each stirring shaft (51) is provided with several stirring scrapers (52) at its bottom.

7. The barite processing wastewater fine material recovery device according to claim 1, characterized in that, The filter belt (2) is provided with a vibration structure (7) fixedly connected to the fixed bracket (1) on the inner side. The vibration structure (7) is located above the solid guide plate (12). At least two vibration rollers (71) are movably connected to the bottom of the vibration structure (7). The bottom of the vibration rollers (71) abuts against the bottom of the inner side of the filter belt (2). The rotation direction of the vibration rollers (71) is consistent with the rotation direction of the filter belt (2).

8. The barite processing wastewater fine material recovery device according to claim 1, characterized in that, The outer surface of the filter belt (2) is provided with a filter groove (21), the filter groove (21) is connected end to end and extends along the rotation direction of the filter belt (2), and a number of filter holes penetrate from the bottom of the filter groove (21) to the inner side of the filter belt (2).

9. The barite processing wastewater fine material recovery device according to claim 1, characterized in that, The top surface of the wastewater guide plate (41) is provided with a wastewater guide groove (42) extending along the rotation direction of the filter belt (2), and the top surface of the solid guide plate (12) is provided with a solid guide groove (14) extending along the rotation direction of the filter belt (2).

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