A sludge pre-concentration device

Abstract

The present application discloses a kind of sludge pre-concentration device, including sludge pump, sludge in sludge pool is extracted by sludge pump, sludge pre-concentration mechanism is installed in sludge pump outlet, the top of sludge pre-concentration mechanism is installed with flocculant dosing device and sludge distributor respectively in left and right ends, sludge water content tester is installed in the right side wall of sludge distributor, according to sludge water content tester determination water content in sludge, let flocculant dosing device add flocculant to sludge appropriately, sludge water content tester right end is installed with sludge storage tank, the bottom of sludge distributor is installed with sludge reflux pipe one end. Not only can reduce the water content of residual sludge, reduce the volume of sludge, shorten the time required for sludge concentration, but also can homogenize sludge, reduce the amount of flocculant, reduce operating cost, and the whole process is high degree of automation, will not produce redundant labor cost, realize pore dredging, guarantee sludge concentration efficiency.

Description

Technical Field

[0001] This invention relates to the field of environmental protection equipment technology, specifically a sludge pre-concentration device. Background Technology

[0002] Currently, most wastewater treatment plants use biological treatment processes, which utilize microorganisms to treat wastewater. As these microorganisms die, the amount of solids precipitated in the biological treatment tank gradually increases and eventually forms sludge. Excessive sludge can affect the efficiency of the biological reactor, so some of the excess biomass needs to be discharged. This discharged excess biomass is called waste sludge.

[0003] Wastewater sludge, an inevitable byproduct of wastewater treatment, has become a bottleneck restricting the further development of wastewater treatment plants. The moisture content of wastewater sludge often exceeds 99%, and due to this extremely high moisture content, it requires concentration and dewatering before further processing.

[0004] Small and medium-sized wastewater treatment plants generally use gravity thickening to reduce the water content of sludge. Under the action of gravity, the sludge gradually settles and is eventually separated into concentrated sludge and supernatant. Gravity thickening can reduce the water content of the remaining sludge from 99% to 97%, thereby greatly reducing the volume of sludge.

[0005] However, due to the high moisture content and uneven composition of the residual sludge, flocculants are generally required to be added during the operation of the sludge thickening process. The cost of flocculants is high and they need to be stored separately, which greatly increases the operating cost of thickening. In addition, sludge thickening generally takes more than 12 hours, which makes the thickening tank occupy a large area, further increasing the construction cost, and the moisture content of the sludge is difficult to decrease again. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a sludge pre-concentration device that reduces the water content of sludge while homogenizing the sludge, thereby reducing the amount of flocculant used, reducing the area of ​​the sludge thickening tank, and reducing the operation and construction costs of sludge thickening.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a sludge pre-concentration device, comprising a sludge pump for pumping sludge from a sludge tank, a sludge pre-concentration mechanism installed at the outlet of the sludge pump, a flocculant dosing device and a sludge distributor installed at the top left and right ends of the sludge pre-concentration mechanism respectively, a sludge moisture content meter installed on the right side wall of the sludge distributor, and flocculant dosing device adding an appropriate amount of flocculant to the sludge based on the moisture content measured by the sludge moisture content meter, a sludge storage tank installed at the right end of the sludge moisture content meter, a sludge return pipe installed at one end of the bottom of the sludge distributor, the other end of the sludge return pipe connected to the inlet of the sludge pump, and a sludge discharge pipe installed at the outlet of the sludge storage tank.

[0008] Preferably, the sludge pre-concentration mechanism includes a sludge tank, a spiral homogenizer welded to the inner wall of the sludge tank, a filter inner membrane horizontally installed at the center of the spiral homogenizer, the right end of the filter inner membrane for wastewater discharge, pores uniformly opened on the surface of the filter inner membrane to filter out water molecules and small molecules in the sludge, a supernatant tank is provided in the inner cavity of the filter inner membrane, a sludge inlet and a sludge outlet are respectively installed at the left and right ends of the top of the sludge tank, the sludge inlet is connected to a sludge pump and a flocculant dosing device, the sludge outlet is connected to a sludge distributor, a one-way valve is installed at the left end of the filter inner membrane to prevent water molecules entering the supernatant tank from being discharged from the left side, and an anti-clogging component is installed at the other end of the one-way valve; Under pressure, the sludge rotates and collides continuously along the spiral homogenizer, exhibiting a turbulent flow state, thus achieving the effect of homogenizing the sludge. Under pressure, the water molecules and small molecules contained in the sludge in the sludge tank pass through the inner filter membrane and enter the supernatant tank, reducing the water content of the sludge in the sludge tank.

[0009] Preferably, the spiral homogenizer is spiral-shaped.

[0010] Preferably, the inner filter membrane has a tubular structure and is made of a polymer membrane material.

[0011] Preferably, the anti-clogging component includes a vibrating tube installed at the left end of the one-way valve. A housing is installed on the outer wall of the vibrating tube. An air supply unit and a first gear are respectively installed on the left and right sides of the outer wall of the vibrating tube. An eccentric unit is installed on the right side wall of the first gear. When the first gear drives the eccentric unit to rotate, the centrifugal force generated by the eccentric unit can cause the vibrating tube to vibrate. A driver is installed at the bottom of the inner cavity of the housing, and the air supply unit and the first gear are driven by the driver.

[0012] Preferably, the air supply unit includes a fan cover installed at the left end of the vibrating tube. A filter screen is installed on the left side wall of the fan cover to filter out dust in the air. A crankshaft that can rotate is installed at the center of the left side wall of the fan cover through a bearing. A fan blade is installed at the right end of the outer wall of the crankshaft. When the fan blade rotates, it generates wind force from left to right. One end of the connecting rod is sleeved on the left end of the crankshaft, and the other end of the connecting rod is connected to the output end of the driver through a pin. The rotating fan blades generate wind, which transports gas upward into the clear liquid tank, and the pressurized gas clears the pores.

[0013] Preferably, the eccentric unit includes a rotating rod installed on the right side wall of the first gear, a screw is screwed into the inner cavity of the rotating rod, and a nut is screwed into the outer wall of the screw. When the nut is screwed into contact with the rotating rod, the screw is positioned. An eccentric block is installed on the top of the screw. The purpose of the eccentric block's eccentric rotation is to cause the vibrating tube to vibrate, thereby causing the inner filter membrane to vibrate.

[0014] Preferably, the eccentric block and the screw are connected by a set screw.

[0015] The sludge pre-thickening device proposed in this invention has the following advantages: 1. This invention increases the sludge pressure using a sludge pump before it enters the sludge tank. Under pressure, the sludge rotates and collides continuously along a spiral homogenizer, exhibiting a turbulent flow pattern, thereby achieving a homogenized sludge effect. Water molecules and small molecules contained in the sludge pass through the pores into the supernatant tank under pressure, reducing the water content of the sludge in the sludge tank. The treated sludge flows out through the sludge outlet, completing the sludge pre-concentration process. This not only reduces the water content of the remaining sludge, reduces the sludge volume, and shortens the time required for sludge concentration, but also homogenizes the sludge, reduces the amount of flocculant used, and reduces operating costs. Furthermore, the entire process is highly automated and does not generate unnecessary labor costs.

[0016] 2. In this invention, a turntable drives one end of a connecting rod to make a circular motion, while the other end of the connecting rod pulls the fan blades on the crankshaft to rotate, blowing air into the upward clear liquid tank. At the same time, under the transmission conditions of the first gear and the second gear, the rotating rod drives the eccentric block to make a centrifugal motion. As the direction of the external force on the vibrating tube changes continuously, the inner membrane of the filter vibrates, thus clearing the pores and ensuring the sludge thickening efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front cross-sectional view of the sludge pre-thickening mechanism. Figure 3 This is a diagram showing the sludge movement path of the sludge pre-thickening unit. Figure 4 This is a front sectional view of the anti-blocking component; Figure 5 for Figure 4 Local structural diagram; Figure 6 This is a front sectional view of the air supply component; Figure 7 This is a schematic diagram of an eccentric unit structure.

[0018] In the diagram: 1. Sludge pump; 2. Sludge pre-thickening mechanism; 3. Flocculant dosing device; 4. Sludge distributor; 5. Sludge moisture content meter; 6. Sludge storage tank; 7. Sludge return pipe; 8. Sludge discharge pipe; 21. Sludge tank; 22. Spiral homogenizer; 23. Inner filter membrane; 24. Pores; 25. Supernatant tank; 26. Sludge inlet; 27. Sludge outlet; 28. Check valve; 29. ​​Anti-clogging component; 291. Vibrating pipe; 2 92. Housing; 293. Air supply unit; 294. First gear; 295. Eccentric unit; 296. Driver; 2931. Fan cover; 2932. Filter screen; 2933. Crankshaft; 2934. Fan blade; 2935. Connecting rod; 2951. Rotating rod; 2952. Screw; 2953. Nut; 2954. Eccentric block; 2961. Dual-shaft motor; 2962. Turntable; 2963. Second gear. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-7 This invention provides a technical solution: a sludge pre-concentration device, including a sludge pump 1, which pumps sludge from a sludge tank. A sludge pre-concentration mechanism 2 is installed at the outlet of the sludge pump 1. A flocculant dosing device 3 and a sludge distributor 4 are respectively installed at the left and right ends of the top of the sludge pre-concentration mechanism 2. A sludge moisture content meter 5 is installed on the right side wall of the sludge distributor 4. Based on the moisture content of the sludge measured by the sludge moisture content meter 5, an appropriate amount of flocculant is added to the sludge by the flocculant dosing device 3. A sludge storage tank 6 is installed at the right end of the sludge moisture content meter 5. A sludge return pipe 7 is installed at one end of the bottom of the sludge distributor 4. The other end of the sludge return pipe 7 is connected to the inlet of the sludge pump 1. A sludge discharge pipe 8 is installed at the outlet of the sludge storage tank 6.

[0021] Sludge pump 1 pressurizes the sludge in the sludge tank and transports it to sludge pre-thickening unit 2. At the same time, flocculant dosing device 3 adds flocculant quantitatively to the pre-thickening unit 2 according to the feedback signal of moisture content meter 5 to promote sludge particle agglomeration. The pre-thickened sludge enters sludge distributor 4 through sludge outlet 27. The moisture content is detected in real time by moisture content meter 5. If the moisture content is ≤ set threshold, distributor 4 controls the valve to open, and the sludge flows into sludge storage tank 6 and is discharged to thickening tank or dewatering equipment through discharge pipe 8. If the moisture content is > set threshold, distributor 4 switches the valve, so that the sludge returns to sludge pump 1 through return pipe 7, mixes with newly extracted sludge, and re-enters pre-thickening unit 2 to achieve cyclic thickening.

[0022] As a preferred option, further combining Figures 1-3 As shown, the sludge pre-concentration mechanism 2 includes a sludge tank 21. A spiral homogenizer 22 is welded to the inner wall of the sludge tank 21. A filter inner membrane 23 is horizontally installed at the center of the spiral homogenizer 22. The right end of the filter inner membrane 23 is used for sewage discharge. The surface of the filter inner membrane 23 is uniformly provided with pores 24, which filter out water molecules and small molecules in the sludge. The inner cavity of the filter inner membrane 23 is provided with a supernatant tank 25. The top left and right ends of the sludge tank 21 are respectively provided with a sludge inlet 26 and a sludge outlet 27. The sludge inlet 26 is connected to the sludge pump 1 and the flocculant dosing device 3. The sludge outlet 27 is connected to the sludge distributor 4. A one-way valve 28 is installed on the left end of the filter inner membrane 23. The one-way valve 28 prevents water molecules entering the supernatant tank 25 from being discharged from the left side. An anti-clogging component 29 is installed on the other end of the one-way valve 28.

[0023] As a preferred option, the spiral homogenizer 22 is spiral-shaped. The sludge entering the sludge tank 21 through the sludge inlet 26 flows along the spiral homogenizer 22, causing the sludge to rotate, collide, and exhibit a turbulent flow state.

[0024] As a preferred option, the inner filter membrane 23 is further designed with a tubular structure and is made of polymer membrane material, which enhances the corrosion resistance of the inner filter membrane 23 and extends its service life.

[0025] More specifically, the inner filter membrane 23 is a tubular polymer membrane module (such as polyacrylonitrile or polyvinylidene fluoride). The surface of the inner filter membrane 23 is uniformly provided with pores 24 with a diameter of 5-10μm, which are used to trap sludge particles and allow water molecules and small molecules to pass through. The inner cavity of the inner membrane forms a supernatant tank 25, which has an annular cross-section and forms a sludge flow channel between itself and the inner wall of the sludge tank 21.

[0026] More specifically, the one-way valve 28 at the left end of the filter inner membrane 23 is a rubber flap type one-way valve, which only allows the liquid in the supernatant tank 25 to flow to the right, preventing sludge from flowing back and contaminating the filtrate. The left end of the one-way valve 28 is connected to the anti-clogging component 29, which removes the blockage on the surface of the pores 24 through periodic vibration and airflow purging. When sludge pump 1 pressurizes and transports sludge (moisture content above 99%) to sludge inlet 26, the sludge and flocculant added simultaneously by flocculant dosing device 3 are initially mixed in the sludge inlet pipe, then enter sludge tank 21 and flow along spiral homogenizer 22. Due to the guiding effect of spiral homogenizer 22, the sludge generates a spiral propulsion rotational flow, and high-frequency collisions occur between particles, forming turbulence, thus achieving homogenization (e.g., Figure 3(Flow path shown); Under the pressure inside the sludge tank 21, free water and small molecules in the sludge enter the supernatant tank 25 through the pores 24 of the inner filter membrane 23 and are discharged through the sewage discharge pipe at the right end; while solid particles are intercepted, forming pre-concentrated sludge with a water content reduced to 97%-98%, which enters the sludge distributor 4 from the sludge outlet 27.

[0027] As a preferred embodiment, the anti-blocking component 29 further includes a vibrating tube 291 installed at the left end of the one-way valve 28. A housing 292 is installed on the outer wall of the vibrating tube 291. An air supply unit 293 and a first gear 294 are respectively installed on the left and right sides of the outer wall of the vibrating tube 291. An eccentric unit 295 is installed on the right side wall of the first gear 294. When the first gear 294 drives the eccentric unit 295 to rotate, the centrifugal force generated by the eccentric unit 295 causes the direction of the external force on the vibrating tube 291 to change continuously, thereby causing the vibrating tube 291 to vibrate. A driver 296 is installed at the bottom of the inner cavity of the housing 292, which drives the air supply unit 293 and the first gear 294 to operate. The driver 296 includes a dual-axis motor 2961 installed at the bottom of the inner wall of the housing 292. A turntable 2962 and a second gear 2963 are respectively installed on the left and right output ends of the dual-axis motor 2961, and the second gear 2963 is meshed with the first gear 294.

[0028] As a preferred embodiment, the air supply unit 293 further includes a fan shroud 2931 installed at the left end of the vibrating tube 291. A filter screen 2932 is installed on the left side wall of the fan shroud 2931 to filter out dust in the air. A crankshaft 2933, which can rotate, is installed at the center of the left side wall of the fan shroud 2931 via a bearing. A fan blade 2934 is installed at the right end of the outer wall of the crankshaft 2933. When the fan blade 2934 rotates, it generates wind force from left to right. One end of a connecting rod 2935 is sleeved on the left end of the crankshaft 2933. The other end of the connecting rod 2935 is connected to the outer edge of the left side wall of the turntable 2962 via a pin.

[0029] After the dual-axis motor 2961 starts, the turntable 2962 at its left output end rotates in a circular motion, driving the crankshaft 2933 to rotate around the bearing axis via the connecting rod 2935, which in turn drives the fan blades 2934 to rotate at high speed. After being filtered by the filter screen 2932, the external air enters through the air inlet on the left side of the fan cover 2931. Driven by the fan blades 2934, a directional airflow is formed from left to right. The airflow is delivered to the upper clear liquid tank 25 through the vibrating tube 291. This airflow can sweep the pores 24 on the surface of the filter inner membrane 23. Combined with the vibration of the eccentric unit 295, it effectively removes blockages and ensures the permeability of the filter inner membrane 23.

[0030] As a preferred embodiment, the eccentric unit 295 further includes a rotating rod 2951 mounted on the right side wall of the first gear 294. A screw rod 2952 is screwed into the inner cavity of the rotating rod 2951, and a nut 2953 is screwed into the outer wall of the screw rod 2952. When the nut 2953 is tightened and contacts the rotating rod 2951, the screw rod 2952 is positioned. An eccentric block 2954 is mounted on the top of the screw rod 2952. The eccentric block 2954 is connected to the screw rod 2952 by a set screw. The eccentric blocks 2954 of different weights can be replaced, thereby changing the vibration energy of the vibrating tube 291.

[0031] When the first gear 294 rotates under the meshing drive of the second gear 2963, it drives the rotating rod 2951 to rotate synchronously, and the screw 2952 and the eccentric block 2954 move in a circular motion with the rotating rod 2951. Since the center of gravity of the eccentric block 2954 is off the axis of rotation, it generates a periodically changing centrifugal force during rotation, causing the vibrating tube 291 to vibrate under the action of alternating external forces, which is then transmitted to the inner filter membrane 23, causing the blockage on its surface pores 24 to loosen and fall off.

[0032] The vibration effect can be adjusted in the following ways: Axial position adjustment of screw 2952: Loosen nut 2953, rotate screw 2952 to adjust the length of its extension from rotating rod 2951, change the eccentricity of eccentric block 2954, and thus adjust the magnitude of centrifugal force; after adjustment, tighten nut 2953 to fix screw 2952.

[0033] Replacement of eccentric block 2954: Loosen the top screw, remove the original eccentric block 2954, and replace it with an eccentric block of different quality or eccentricity to change the vibration energy and frequency to adapt to the filter inner membrane 23 with different degrees of clogging.

[0034] It enables adjustable vibration intensity, ensuring that the inner filter membrane 23 maintains high permeability during long-term use, and effectively prevents pore 24 from clogging when combined with the airflow purging of the air supply unit 293.

[0035] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0036] Step 1: During use, the sludge is first pressurized by the sludge pump 1 and enters the sludge tank 21 through the sludge inlet 26. Under the action of pressure, it rotates and collides continuously along the spiral homogenizer 22 and exhibits a turbulent flow state, thereby achieving the effect of uniform sludge. Under the action of pressure, the water molecules and small molecules contained in the sludge in the sludge tank 21 pass through the filter inner membrane 23 and enter the supernatant tank 25, reducing the water content of the sludge in the sludge tank 21. The treated sludge flows out through the sludge outlet 27, and the supernatant in the supernatant tank 25 flows into the sewage pipe, completing the sludge pre-concentration process. Step 2: The sludge moisture content meter 5 can measure the moisture content of the sludge in real time. If the moisture content is greater than a certain specific value, a signal is transmitted to the sludge distributor 4, causing the sludge in the sludge distributor 4 to flow to the sludge return pipe 7 and finally flow back to the sludge pump 1 for repeated pre-concentration. At the same time, a signal is transmitted to the flocculant dosing device 3, and the flocculant dosing device 3 starts to add flocculant. If the moisture content is lower than a certain specific value, the sludge in the sludge distributor 4 flows into the sludge storage tank 6. Step 3: When it is necessary to remove the impurities adsorbed on the pores 24, the dual-shaft motor 2961 drives the turntable 2962 and the second gear 2963 to rotate. The turntable 2962 drives one end of the connecting rod 2935 to make a circular motion, and the other end of the connecting rod 2935 pulls the crankshaft 2933 to rotate. When the fan blades 2934 rotate, they generate wind. The air enters the vibrating tube 291 after being filtered by the filter screen 2932. The air is pressurized in the supernatant tank 25. Simultaneously, under the transmission conditions of the first gear 294 and the second gear 2963, the rotating rod 2951 drives the eccentric block 2954 to rotate. The centrifugal force generated by the eccentric block 2954 causes the vibrating tube 291 to tend to move outward. The constantly changing direction of the external force causes the vibrating tube 291 to vibrate, which in turn causes the filter inner membrane 23 to vibrate, loosening the impurities on the pores 24. The airflow blows away the impurities, removing impurities from the filter inner membrane 23 and reducing the sludge moisture content during sludge pre-concentration. Step 4: When it is necessary to adjust the vibration effect of the inner filter membrane 23, turn the nut 2953 away from the rotating rod 2951 to release the positioning of the eccentric block 2954, and let the screw 2952 rotate clockwise or counterclockwise. The eccentric block 2954 moves away from or closer to the vibrating tube 291, changing the centrifugal force when the eccentric block 2954 rotates. Alternatively, you can replace the eccentric block 2954 with one of different mass to change the centrifugal force, thereby adjusting the vibration effect of the vibrating tube 291, which helps to clean the pores 24.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sludge pre-thickening device, comprising a sludge pump (1), wherein the sludge pump (1) is used to extract sludge from a sludge tank, characterized in that, The sludge pump (1) is equipped with a sludge pre-concentration mechanism (2) at its outlet. The top left and right ends of the sludge pre-concentration mechanism (2) are respectively equipped with a flocculant dosing device (3) and a sludge distributor (4). The right side wall of the sludge distributor (4) is equipped with a sludge moisture content meter (5). According to the moisture content of the sludge measured by the sludge moisture content meter (5), the flocculant dosing device (3) adds an appropriate amount of flocculant to the sludge. The right end of the sludge moisture content meter (5) is equipped with a sludge storage tank (6). The bottom of the sludge distributor (4) is equipped with one end of a sludge return pipe (7). The other end of the sludge return pipe (7) is connected to the inlet of the sludge pump (1). The outlet of the sludge storage tank (6) is equipped with a sludge discharge pipe (8). The sludge pre-concentration mechanism (2) includes a sludge tank (21). A spiral homogenizer (22) is welded to the inner wall of the sludge tank (21). A filter inner membrane (23) is horizontally installed at the center of the spiral homogenizer (22). The right end of the filter inner membrane (23) is used for sewage discharge. The surface of the filter inner membrane (23) is uniformly provided with pores (24). Water molecules and small molecules in the sludge are filtered out through the pores (24). The inner cavity of the filter inner membrane (23) is provided with a supernatant tank (25). The mud tank (21) has a mud inlet (26) and a mud outlet (27) installed at the top left and right ends respectively. The mud inlet (26) is connected to the sludge pump (1) and the flocculant dosing device (3), and the mud outlet (27) is connected to the sludge distributor (4). The filter inner membrane (23) has a one-way valve (28) installed at the left end. The one-way valve (28) prevents water molecules entering the supernatant tank (25) from being discharged from the left side. The other end of the one-way valve (28) is equipped with an anti-clogging component (29). The anti-blocking component (29) includes a vibrating tube (291) installed on the left end of the one-way valve (28). A housing (292) is installed on the outer wall of the vibrating tube (291). An air supply unit (293) and a first gear (294) are respectively installed on the left and right sides of the outer wall of the vibrating tube (291). An eccentric unit (295) is installed on the right side wall of the first gear (294). When the first gear (294) drives the eccentric unit (295) to rotate, the centrifugal force generated by the eccentric unit (295) can cause the vibrating tube (291) to vibrate. A driver (296) is installed at the bottom of the inner cavity of the housing (292). The driver (296) drives the air supply unit (293) and the first gear (294) to run. The air supply unit (293) forms a directional airflow from left to right, which delivers pressurized gas into the clear liquid tank (25) through the vibrating pipe (291).

2. The sludge pre-thickening device according to claim 1, characterized in that, The spiral homogenizer (22) is spiral in shape.

3. The sludge pre-thickening device according to claim 2, characterized in that, The inner filter membrane (23) has a tubular structure and is made of polymer membrane material.

4. The sludge pre-thickening device according to claim 3, characterized in that, The air supply unit (293) includes a fan cover (2931) installed on the left end of the vibrating tube (291). A filter screen (2932) is installed on the left side wall of the fan cover (2931) to filter out dust in the air. A crankshaft (2933) that can rotate is installed at the center of the left side wall of the fan cover (2931) through a bearing. A fan blade (2934) is installed on the right end of the outer wall of the crankshaft (2933). When the fan blade (2934) rotates, it generates wind force from left to right. A connecting rod (2935) is sleeved on the left end of the crankshaft (2933). The other end of the connecting rod (2935) is connected to the output end of the driver (296) through a pin.

5. A sludge pre-thickening device according to claim 4, characterized in that, The eccentric unit (295) includes a rotating rod (2951) mounted on the right side wall of the first gear (294). A screw (2952) is screwed into the inner cavity of the rotating rod (2951), and a nut (2953) is screwed into the outer wall of the screw (2952). When the nut (2953) is turned and contacts the rotating rod (2951), the screw (2952) is positioned. An eccentric block (2954) is mounted on the top of the screw (2952).

6. A sludge pre-thickening device according to claim 5, characterized in that, The eccentric block (2954) and the screw (2952) are connected by a set screw.

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