Belt type sludge squeezing, filtering and dehydrating device and method

Abstract

The present application provides a belt-type sludge pressing, filtering and dehydrating device, comprising a belt-type pressing part, a pretreatment filtering part, and a sludge input pipe, wherein the sludge input pipe is circulated with sludge to be pressed and dehydrated; the pretreatment filtering part is arranged below the outlet of the sludge input pipe, and the pretreatment filtering part is used to filter out large impurities in the sludge; the belt-type pressing part is arranged below the pretreatment filtering part, and the belt-type pressing part is used to press and dehydrate the sludge after the pretreatment. The belt-type sludge pressing, filtering and dehydrating device provided by the present application can filter and screen out large impurities in the sludge, so that there are no large impurities in the sludge entering the belt-type pressing part, so that the belt-type pressing part can press and dehydrate the sludge, ensure the sludge pressing and dehydrating effect and protect the belt-type pressing part, reduce the damage of the belt-type pressing part during the sludge pressing and dehydrating process, and increase the service life of the belt-type pressing part.

Description

Technical Field

[0001] The present invention relates to the field of sludge treatment, and in particular to a belt-type sludge pressing, filtering and dehydrating device and method. Background Art

[0002] In the field of water treatment, a large amount of sludge is usually produced. In order to reduce the volume of sludge and facilitate its transportation and subsequent treatment, the sludge is usually squeezed and dehydrated. Traditional sludge squeezing and dehydration treatment devices include belt-type squeezing and dehydration devices, spiral squeezing and dehydration devices, plate and frame filter press devices and other structures. Among them, the belt-type squeezing and dehydration device has the advantages of stable operation and high capacity for continuous squeezing and dehydrating sludge. However, the traditional belt press and dewatering device cannot pre-remove large impurities in the sludge (such as the sludge formed after mine sewage treatment, which contains large stones). After the large impurities enter the belt press and dewatering device, since the large impurities are relatively hard, when the belt press and dewatering device applies pressure to the sludge blocks for squeezing, the large impurities will hinder the belt press and dewatering device from compressing the sludge blocks (the large impurities are pressed between the upper and lower pressing conveyor belts), resulting in the belt press and dewatering device being unable to completely squeeze and dehydrate the sludge, thereby affecting the squeezing and dehydrating effect of the belt press and dewatering device. In addition, the large impurities can easily accelerate the damage of the pressing conveyor belt, resulting in a sharp decline in the service life of the pressing conveyor belt. Summary of the invention

[0003] One object of the present invention is to provide a belt type sludge pressing, filtering and dewatering device to solve the problem that the traditional belt type pressing and dewatering device cannot pre-screen out large impurities in the sludge, resulting in reduced pressing and dewatering effect of the belt type pressing and dewatering device and the service life of the pressing conveyor belt.

[0004] In order to solve the above technical problems, the present invention provides a belt-type sludge pressing, filtering and dehydrating device, which comprises:

[0005] A sludge input pipe, in which sludge to be squeezed and dehydrated flows;

[0006] A pre-treatment filter unit, which is arranged below the outlet of the sludge input pipe and is used to filter out large impurities in the sludge;

[0007] The belt press section is arranged below the pretreatment filter section and is used for pressing and dehydrating the pretreated sludge.

[0008] In one embodiment, the pre-processing filter unit comprises:

[0009] A rotating shaft, the rotating shaft is rotatably disposed below the outlet of the sludge input pipe;

[0010] A first power unit, wherein a power output shaft of the first power unit is connected to the rotating shaft, the first power unit drives the rotating shaft to rotate, and a linear velocity direction of the rotating shaft close to the sludge input pipe is upward;

[0011] A plurality of screening blades, wherein the screening blades are evenly surrounded and fixed on the rotating shaft;

[0012] A collecting part, the collecting part is fixed on the belt press part, and the collecting part is located below the side of the rotating shaft away from the sludge input pipe, and the collecting part is used to collect large impurities screened out by the screening blades;

[0013] A connecting filter plate, wherein the upper end of the connecting filter plate is connected to the bottom of the sludge input pipe, and the bottom of the connecting filter plate is adjacent to the belt pressing part.

[0014] In one embodiment, it further comprises an automatic dispersing unit, which is disposed on the collecting unit and comprises:

[0015] A dispersion rod, the dispersion rod being slidably disposed on the collecting portion;

[0016] An elastic member, one end of which is connected to the dispersion rod, and the other end of which is connected to the collecting part;

[0017] A dispersion block, wherein the dispersion block is fixed on the dispersion rod, the bottom of the dispersion block is slidably fitted on the surface of the belt pressing section, the bottom of the dispersion block includes a plurality of wedge-shaped dispersion structures, and the tip of the wedge-shaped dispersion structure is facing opposite to the movement direction of the sludge; the top of the dispersion block interacts with the screening blade, and when the tip of the screening blade rotates to a low point area, the screening blade drives the dispersion block and the dispersion rod to move away from the collecting section until the tip of the screening blade rotates away from the low point area, and the screening blade is separated from the dispersion block.

[0018] In one embodiment, a smoothing portion is further included. The smoothing portion is arranged at the bottom of the collecting portion. A smoothing plane is arranged at the bottom of the smoothing portion. The smoothing plane is arranged obliquely downward along the sludge movement direction.

[0019] In one embodiment, the screening blade comprises:

[0020] A plurality of screening rods, the screening rods are arranged parallel to each other and equidistantly, one end of the screening rod is fixed on the rotating shaft, the cross section of the screening rod is triangular, and when the screening blade rotates to a side close to the sludge input pipe, the tip of the screening rod faces upward;

[0021] An end connecting rod is connected to the other end of the screening rod.

[0022] In one embodiment, the screening bars on adjacent screening blades are arranged in a staggered manner.

[0023] In one embodiment, the belt press section comprises:

[0024] A lower pressing conveyor belt, wherein the lower pressing conveyor belt is supported below the pre-treatment filter portion through a lower transmission roller;

[0025] An upper pressing conveyor belt, wherein the upper pressing conveyor belt is supported above the lower pressing conveyor belt through an upper transmission roller, and the upper pressing conveyor belt moves synchronously with the lower pressing conveyor belt;

[0026] The second power unit drives the lower transmission roller to operate on the upper transmission roller.

[0027] In one embodiment, the belt pressing section also includes a scraper section, which is arranged at the output ends of the lower pressing conveyor belt and the upper pressing conveyor belt. The scraper section is in close contact with the surface of the lower pressing conveyor belt and the upper pressing conveyor belt, and the scraper section is used to scrape off the sludge squeezed on the lower pressing conveyor belt and the upper pressing conveyor belt.

[0028] In one embodiment, the belt pressing section also includes a circulating spraying section, which includes a pressing water collecting tank, a filter, a pump body, a spraying water pipe, and a nozzle; the pressing water collecting tank is arranged below the lower pressing conveyor belt, and the pressing water collecting tank is used to collect water squeezed out of the sludge; the pump body is arranged in the pressing water collecting tank, and the filter is arranged at the input end of the pump body, one end of the spraying water pipe is connected to the output end of the pump body, and the other end of the spraying water pipe is arranged on the return side of the lower pressing conveyor belt and the upper pressing conveyor belt, and the nozzle is arranged on the end of the spraying water pipe away from the pump body, and the spraying direction of the nozzle is toward the lower pressing conveyor belt / the upper pressing conveyor belt.

[0029] Another object of the present invention is to provide a belt-type sludge pressing, filtering and dehydrating method, which uses the belt-type sludge pressing, filtering and dehydrating device described in any one of the above embodiments, and the belt-type sludge pressing, filtering and dehydrating method comprises the following steps:

[0030] S1. Continuously input the sludge with squeezing and dehydration into the pretreatment filter part through the sludge input pipe;

[0031] S2, the pre-treatment filtration unit filters and screens the sludge, picks out large impurities in the sludge, prevents large impurities from entering the belt press unit and damaging the belt press unit and affecting the sludge pressing and dehydration effect, and performs preliminary filtration and dehydration on the sludge;

[0032] S3, the pre-treated sludge enters the belt press section for pressing and dehydration, and the dehydrated sludge is discharged from the end of the belt press section;

[0033] S4. Use transportation tools to promptly transport the squeezed and dehydrated sludge at the end of the belt press section to avoid sludge accumulation that affects the normal operation of the belt press section.

[0034] One or more of the above technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0035] The belt sludge pressing, filtering and dewatering device provided in the embodiment of the present invention uses a pretreatment filter section below the sludge input pipe to filter the sludge that is about to enter the belt press section, thereby filtering out large impurities in the sludge, so that there are no large impurities in the sludge entering the belt press section, so that the belt press section can press and dewater the sludge, ensure the sludge pressing and dehydration effect and protect the belt press section, reduce the damage of the belt press section during the sludge pressing and dehydration process, and increase the service life of the belt press section. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the structure of a belt-type sludge pressing, filtering and dehydrating device provided in an embodiment of the present invention;

[0038] Figure 2 for Figure 1 A schematic diagram of the structure when the dispersion rod is extended to the limit position;

[0039] Figure 3 A schematic diagram of a dispersed block structure provided by an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the structure of a screening blade provided in an embodiment of the present invention;

[0041] Figure 5 A diagram showing the working principle of the screening blades provided in an embodiment of the present invention.

[0042] The reference numerals are as follows:

[0043] 1. Sludge input pipe; 2. Pretreatment filter section; 3. Belt press section; 4. Automatic dispersion section; 5. Smoothing section; 21. Rotating shaft; 22. Screening blades; 23. Collecting section; 24. Connecting filter plate; 31. Lower pressing conveyor belt; 32. Upper pressing conveyor belt; 41. Dispersion rod; 42. Elastic part; 43. Dispersion block; 221. Screening rod; 222. End connecting rod. DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0045] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] See also Figure 1 to Figure 2The embodiment of the present application provides a belt-type sludge pressing, filtering and dehydrating device, comprising a belt-type pressing section 3, a pretreatment filtering section 2, and a sludge input pipe 1, wherein the sludge input pipe 1 flows with sludge to be pressed and dehydrated; the pretreatment filtering section 2 is arranged below the outlet of the sludge input pipe 1, and the pretreatment filtering section 2 is used to filter out large impurities in the sludge; the belt-type pressing section 3 is arranged below the pretreatment filtering section 2, and the belt-type pressing section 3 is used to press and dehydrate the sludge after the pretreatment.

[0049] The belt sludge pressing, filtering and dewatering device provided in the present embodiment uses a pretreatment filter section 2 below the sludge input pipe 1 to filter the sludge that is about to enter the belt press section 3, thereby filtering out large impurities in the sludge, so that there are no large impurities in the sludge entering the belt press section 3, so that the belt press section 3 can press and dewater the sludge, ensure the sludge pressing and dehydration effect, protect the belt press section 3, reduce the damage of the belt press section 3 during the sludge pressing and dehydration process, and increase the service life of the belt press section 3.

[0050] In one embodiment, the pre-treatment filter section 2 includes a collecting section 23, a first power section, a plurality of screening blades 22, a rotating shaft 21, and a connecting filter plate 24 (the connecting filter plate 24 may be an arc-shaped porous plate, and the center of the arc may be the axis of the rotating shaft 21). The rotating shaft 21 is rotatably arranged below the outlet of the sludge input pipe 1; the power output shaft of the first power section is connected to the rotating shaft 21, and the first power section drives the rotating shaft 21 to rotate, and the linear velocity direction of the rotating shaft 21 close to the sludge input pipe 1 is upward; the screening blades 22 are uniformly fixed around the rotating shaft 21 (the angles between the screening blades 22 are equal); the collecting section 23 is fixed on the belt press section 3, and the collecting section 23 is located below the side of the rotating shaft 21 away from the sludge input pipe 1, and the collecting section 23 is used to collect large impurities screened out by the screening blades 22; the upper end of the connecting filter plate 24 is connected to the bottom of the sludge input pipe 1, and the bottom of the connecting filter plate 24 borders the belt press section 3.

[0051] When the pre-treatment filter unit 2 is working, the first power unit starts and drives the rotating shaft 21 to rotate, thereby causing the screening blades 22 on the rotating shaft 21 to rotate (such as Figure 1The sludge to be squeezed and dehydrated flows out of the sludge input pipe 1 and falls onto the screening blades 22 below. After being screened by the screening blades 22, large impurities remain on the screening blades 22, while the sludge passes through the screening blades 22 and falls onto the connecting filter plate 24 below (when the sludge is on the connecting filter plate 24, part of the water in the sludge can flow out through the through holes of the connecting filter plate 24, thereby reducing the water content of the sludge), and then flows to the belt press section 3 after being guided by the connecting filter plate 24. After the large impurities rotate to the right side of the rotating shaft 21 as the screening blades 22 rotate, the large impurities automatically fall into the collecting section 23 below under the action of their own gravity, and the collecting section 23 collects the large impurities. And when one screening blade 22 rotates away from under the sludge input pipe 1, the next screening blade 22 will rotate to the bottom of the sludge input pipe 1 accordingly, thereby realizing continuous filtering of the sludge discharged from the sludge input pipe 1 to remove large impurities, and can automatically clean the large impurities filtered out by the screening blade 22 to maintain the screening function of the screening blade 22.

[0052] like Figure 1-2 As shown, in one embodiment, it also includes an automatic dispersion part 4, which is arranged on the collection part 23, and includes an elastic member 42, a dispersion block 43, and a dispersion rod 41. Among them, the dispersion rod 41 is slidably arranged on the collection part 23; one end of the elastic member 42 is connected to the dispersion rod 41, and the other end of the elastic member 42 is connected to the collection part 23; the dispersion block 43 is fixed on the dispersion rod 41, and the bottom of the dispersion block 43 is slidably matched with the surface of the belt press part 3, and the bottom of the dispersion block 43 includes a plurality of wedge-shaped dispersion structures, and the tip of the wedge-shaped dispersion structure is opposite to the movement direction of the sludge; the top of the dispersion block 43 interacts with the screening blade 22, and when the end of the screening blade 22 rotates to the low point area, the screening blade 22 drives the dispersion block 43 and the dispersion rod 41 to move in the direction away from the collection part 23, until the end of the screening blade 22 rotates away from the low point area, and the screening blade 22 is separated from the dispersion block 43.

[0053] When the tip of the screening blade 22 rotates to the low point area (such as Figure 1 As shown in the state, the screening blade 22 is against the top of the dispersion block 43. As the screening blade 22 continues to rotate, the screening blade 22 drives the dispersion block 43 and the dispersion rod 41 to overcome the elastic force of the elastic member 42 (spring or elastic rope) and move to the left until the screening blade 22 moves to the point where it is about to leave the low point area (such as Figure 2In this process, the dispersion block 43 slides on the lower squeezing conveyor belt 31 of the automatic dispersion unit 4 to disperse the sludge originally accumulated on the lower squeezing conveyor belt 31, so that the sludge distribution on the lower squeezing conveyor belt 31 is more uniform, which is convenient for the subsequent squeezing and dehydration work, and the water in the sludge can be timely discharged through the drainage holes of the lower squeezing conveyor belt 31 (control the water content of the sludge and reduce the fluidity of the sludge to facilitate squeezing and dehydration). When the dispersion block 43 moves to Figure 2 At this time, the screening blade 22 continues to rotate, which will cause the screening blade 22 and the dispersion block 43 to be out of engagement. The dispersion block 43 and the dispersion rod 41 quickly retract to the right under the elastic force of the elastic member 42 until they hit the next screening blade 22 on the right and return to the position shown in the figure. Figure 1 The belt press section 30 is in the state shown, and moves to the left driven by the next screening blade 22 to perform the next sludge dispersion action, thereby realizing automatic circulation to disperse the sludge on the lower pressing conveyor belt 31, so that the belt pressing section 3 can press and dehydrate the sludge.

[0054] In addition, since the dispersion block 43 and the dispersion rod 41 will collide with the next screening blade 22 after retraction, the collision will cause the screening blade 22 to vibrate, thereby facilitating the sliding of large impurities into the collecting portion 23 and improving the screening efficiency of the screening blade 22 for sludge. Figure 2 When in the position shown, they will be hit by the dispersion block 43 and vibrate, so that each screening blade 22 will be affected by the vibration when pouring large impurities into the collecting part 23, ensuring that the large impurities on the screening blade 22 can be completely poured into the collecting part 23.

[0055] In one embodiment, a smoothing part 5 is further included, and the smoothing part 5 is arranged at the bottom of the collecting part 23. A smoothing surface is arranged at the bottom of the smoothing part 5, and the smoothing surface is arranged downwardly along the direction of sludge movement. The smoothing part 5 can make the sludge on the lower pressing conveyor belt 31 flat and uniform, so as to facilitate the subsequent squeezing and dehydration of the sludge.

[0056] like Figure 4 As shown, in one embodiment, the screening blade 22 includes a terminal connecting rod 222 and a plurality of screening rods 221. The screening rods 221 are arranged parallel to each other and equidistantly, one end of the screening rod 221 is fixed to the rotating shaft 21, and the cross section of the screening rod 221 is triangular. When the screening blade 22 rotates to the side close to the sludge input pipe 1, the tip of the screening rod 221 faces upward; the terminal connecting rod 222 is connected to the other end of the screening rod 221. By setting the screening rod 221 to have a triangular cross-section, when the sludge is filtered and screened by the screening blade 22, the screening rod 221 can disperse the concentrated sludge, so that the sludge can fall more evenly on the connecting filter plate 24 below, so that the sludge can discharge water during the pretreatment process.

[0057] like Figure 5 As shown, in order to improve the dispersing effect of the screening blades 22, in one embodiment, the screening bars 221 on adjacent screening blades 22 are arranged in a staggered manner. By staggering the screening bars 221 on adjacent screening blades 22, the upper and lower screening blades can disperse the sludge in turn, thereby improving the sludge dispersing effect.

[0058] In one embodiment, the belt press section 3 includes a second power unit, an upper press conveyor belt 32, and a lower press conveyor belt 31. The lower press conveyor belt 31 is supported below the pre-treatment filter section 2 by a lower transmission roller; the upper press conveyor belt 32 is supported above the lower press conveyor belt 31 by an upper transmission roller, and the upper press conveyor belt 32 moves synchronously with the lower press conveyor belt 31; the second power unit drives the lower transmission roller to operate with the upper transmission roller. When the sludge moves between the upper press conveyor belt 32 and the lower press conveyor belt 31, the upper transmission roller and the lower transmission roller give relative pressure to the upper press conveyor belt 32 and the lower press conveyor belt 31, so that the sludge between the two is squeezed and dehydrated.

[0059] In one embodiment, the belt press section 3 further includes a scraper section, which is disposed at the output ends of the lower pressing conveyor belt 31 and the upper pressing conveyor belt 32, and is closely attached to the surfaces of the lower pressing conveyor belt 31 and the upper pressing conveyor belt 32, and is used to scrape off the sludge squeezed on the lower pressing conveyor belt 31 and the upper pressing conveyor belt 32. The scraper section can prevent the dehydrated sludge from adhering to the lower pressing conveyor belt 31 and the upper pressing conveyor belt 32 and affecting the subsequent squeezing and dehydration effect.

[0060] In one embodiment, the belt pressing section 3 also includes a circulating spraying section, which includes a pressing water collecting tank, a filter, a pump body, a spraying water pipe, and a nozzle; the pressing water collecting tank is arranged below the lower pressing conveyor belt 31, and the pressing water collecting tank is used to collect the water squeezed out of the sludge; the pump body is arranged in the pressing water collecting tank, and a filter is arranged at the input end of the pump body, one end of the spraying water pipe is connected to the output end of the pump body, and the other end of the spraying water pipe is arranged on the return side of the lower pressing conveyor belt 31 and the upper pressing conveyor belt 32, and the nozzle is arranged on the end of the spraying water pipe away from the pump body, and the spraying direction of the nozzle is toward the lower pressing conveyor belt 31 / upper pressing conveyor belt 32. By setting up a circulating spraying part, the surface of the lower pressing conveyor belt 31 and the upper pressing conveyor belt 32 can be cleaned, so that the originally blocked water outlet holes on the lower pressing conveyor belt 31 and the upper pressing conveyor belt 32 are flushed through, thereby maintaining the filtering effect of the lower pressing conveyor belt 31 and the upper pressing conveyor belt 32, so as to facilitate the drainage of sludge during squeezing. In addition, since circulating water is used, water resources are saved and it is more environmentally friendly.

[0061] Another object of the present invention is to provide a belt-type sludge pressing, filtering and dehydrating method, which uses the belt-type sludge pressing, filtering and dehydrating device in any one of the above embodiments. The belt-type sludge pressing, filtering and dehydrating method comprises the following steps:

[0062] S1, continuously inputting the squeezed and dehydrated sludge into the pretreatment filter part 2 through the sludge input pipe 1;

[0063] S2, the pre-treatment filter section 2 filters and screens the sludge, picks out large impurities in the sludge, prevents the large impurities from entering the belt press section 3 and damaging the belt press section 3 and affecting the sludge squeezing and dehydration effect, and performs preliminary filtering and dehydration on the sludge;

[0064] S3, the pre-treated sludge enters the belt press section 3 for squeezing and dehydration, and the dehydrated sludge is discharged from the end of the belt press section 3;

[0065] S4. Use transportation tools to promptly transport the squeezed and dehydrated sludge at the end of the belt press section 3 to prevent sludge accumulation from affecting the normal operation of the belt press section 3.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A belt type sludge pressing, filtering and dehydrating device, characterized in that: The belt type sludge pressing, filtering and dehydrating device comprises: A sludge input pipe, in which sludge to be squeezed and dehydrated flows; A pre-treatment filter unit, which is arranged below the outlet of the sludge input pipe and is used to filter out large impurities in the sludge; A belt press section, which is arranged below the pretreatment filter section and is used to press and dehydrate the pretreated sludge; the pretreatment filter section comprises: A rotating shaft, the rotating shaft is rotatably disposed below the outlet of the sludge input pipe; A first power unit, wherein a power output shaft of the first power unit is connected to the rotating shaft, the first power unit drives the rotating shaft to rotate, and a linear velocity direction of the rotating shaft close to the sludge input pipe is upward; A plurality of screening blades, wherein the screening blades are evenly surrounded and fixed on the rotating shaft; A collecting part, the collecting part is fixed on the belt press part, and the collecting part is located below the side of the rotating shaft away from the sludge input pipe, and the collecting part is used to collect large impurities screened out by the screening blades; A connecting filter plate, the upper end of which is connected to the bottom of the sludge input pipe, and the bottom of which is adjacent to the belt press part; and an automatic dispersing part, which is arranged on the collecting part, and includes: A dispersion rod, the dispersion rod being slidably disposed on the collecting portion; An elastic member, one end of which is connected to the dispersion rod, and the other end of which is connected to the collecting part; A dispersion block, wherein the dispersion block is fixed on the dispersion rod, the bottom of the dispersion block is slidably fitted on the surface of the belt pressing section, the bottom of the dispersion block includes a plurality of wedge-shaped dispersion structures, and the tip of the wedge-shaped dispersion structure is facing opposite to the movement direction of the sludge; the top of the dispersion block interacts with the screening blade, and when the tip of the screening blade rotates to a low point area, the screening blade drives the dispersion block and the dispersion rod to move away from the collecting section until the tip of the screening blade rotates away from the low point area, and the screening blade is separated from the dispersion block.

2. A belt type sludge pressing, filtering and dewatering device according to claim 1, characterized in that: It also includes a smoothing portion, which is arranged at the bottom of the collecting portion. The bottom of the smoothing portion is provided with a smoothing plane, and the smoothing plane is arranged obliquely downward along the sludge movement direction.

3. A belt type sludge pressing, filtering and dewatering device according to claim 1, characterized in that: The screening blade comprises: A plurality of screening rods, the screening rods are arranged parallel to each other and equidistantly, one end of the screening rod is fixed on the rotating shaft, the cross section of the screening rod is triangular, and when the screening blade rotates to a side close to the sludge input pipe, the tip of the screening rod faces upward; An end connecting rod is connected to the other end of the screening rod.

4. A belt type sludge pressing, filtering and dewatering device according to claim 3, characterized in that: The screening bars on adjacent screening blades are arranged in a staggered manner.

5. The belt type sludge pressing, filtering and dewatering device according to claim 1, characterized in that: The belt press section comprises: A lower pressing conveyor belt, wherein the lower pressing conveyor belt is supported below the pre-treatment filter portion through a lower transmission roller; An upper squeezing conveyor belt, wherein the upper squeezing conveyor belt is supported above the lower squeezing conveyor belt through an upper transmission roller, and the upper squeezing conveyor belt moves synchronously with the lower squeezing conveyor belt; The second power unit drives the lower transmission roller and the upper transmission roller to operate.

6. A belt type sludge pressing, filtering and dewatering device according to claim 5, characterized in that: The belt pressing section also includes a scraper section, which is arranged at the output ends of the lower pressing conveyor belt and the upper pressing conveyor belt. The scraper section is in close contact with the surfaces of the lower pressing conveyor belt and the upper pressing conveyor belt, and is used to scrape off the sludge squeezed on the lower pressing conveyor belt and the upper pressing conveyor belt.

7. A belt type sludge pressing, filtering and dewatering device according to claim 6, characterized in that: The belt pressing section also includes a circulating spraying section, which includes a pressing water collecting tank, a filter, a pump body, a spraying water pipe, and a nozzle; the pressing water collecting tank is arranged below the lower pressing conveyor belt, and the pressing water collecting tank is used to collect the water squeezed out of the sludge; the pump body is arranged in the pressing water collecting tank, and the filter is arranged at the input end of the pump body, one end of the spraying water pipe is connected to the output end of the pump body, and the other end of the spraying water pipe is arranged on the return side of the lower pressing conveyor belt and the upper pressing conveyor belt, and the nozzle is arranged on the end of the spraying water pipe away from the pump body, and the spraying direction of the nozzle is toward the lower pressing conveyor belt / the upper pressing conveyor belt.

8. A belt-type sludge pressing, filtering and dehydrating method, using the belt-type sludge pressing, filtering and dehydrating device according to any one of claims 1 to 7, characterized in that: The belt type sludge pressing, filtering and dehydrating method comprises the following steps: S1. Continuously input the sludge with squeezing and dehydration into the pre-treatment filter part through the sludge input pipe; S2, the pre-treatment filtration unit filters and screens the sludge, picks out large impurities in the sludge, prevents large impurities from entering the belt press unit and damaging the belt press unit and affecting the sludge pressing and dehydration effect, and performs preliminary filtration and dehydration on the sludge; S3, the pre-treated sludge enters the belt press section for pressing and dehydration, and the dehydrated sludge is discharged from the end of the belt press section; S4. Use transportation tools to promptly transport the squeezed and dehydrated sludge at the end of the belt press section to avoid sludge accumulation that affects the normal operation of the belt press section.

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