Sludge pre-concentration device

Abstract

The invention discloses a sludge pre-concentration device which comprises a sludge pump, sludge in a sludge tank is pumped through the sludge pump, a sludge pre-concentration mechanism is mounted at a liquid outlet of the sludge pump, and a flocculant doser and a sludge distributor are mounted at the left end and the right end of the top of the sludge pre-concentration mechanism respectively. A sludge water content tester is mounted on the right side wall of the sludge distributor, the water content in sludge is measured according to the sludge water content tester, a proper amount of flocculating agent is added into the sludge by the flocculating agent doser, a sludge storage box is mounted at the right end of the sludge water content tester, and one end of a sludge return pipe is mounted at the bottom of the sludge distributor. The water content of the excess sludge can be reduced, the volume of the sludge can be reduced, the time required for sludge concentration can be shortened, meanwhile, the sludge can be homogenized, the usage amount of a flocculating agent can be reduced, the operation cost can be reduced, the whole process is high in automation degree, redundant labor cost cannot be generated, pore dredging is achieved, and the sludge concentration efficiency is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection treatment equipment, in particular to a sludge pre-concentration device. Background Art

[0002] Currently, most wastewater treatment plants in my country use biological treatment processes, utilizing microorganisms to treat wastewater. As the microorganisms die, the amount of solids precipitated in the biological treatment tank gradually increases, eventually forming sludge. Excessive sludge can affect the efficiency of the biological reactor, so a portion of the excess biomass must be discharged. This excess biomass is called excess sludge.

[0003] Excess sludge, an inevitable byproduct of wastewater treatment, has become a bottleneck restricting the further development of my country's wastewater treatment plants. Excess sludge often contains over 99% moisture, requiring concentration and dehydration before further disposal.

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

[0005] However, since the residual sludge has an excessively high moisture content and uneven composition, the sludge thickening process generally requires the addition of flocculants during operation. Flocculants are expensive and need to be stored separately, which greatly increases the operating cost of the thickening process. Sludge thickening generally takes more than 12 hours, which takes too long and occupies a large area of the thickening tank, further increasing the construction cost and making it difficult to reduce the sludge moisture content 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 can homogenize the sludge while reducing the sludge moisture content, thereby reducing the amount of flocculant used, reducing the area of the sludge concentration tank, and reducing the sludge concentration operation and construction costs.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sludge pre-concentration device, comprising a sludge pump, which extracts sludge from a sludge pool through the sludge pump, a sludge pre-concentration mechanism being installed at the liquid outlet of the sludge pump, a flocculant doser and a sludge distributor being installed at the left and right ends of the top of the sludge pre-concentration mechanism respectively, a sludge moisture content meter being installed on the right side wall of the sludge distributor, the moisture content in the sludge being measured by the sludge moisture content meter, and the flocculant doser adding an appropriate amount of flocculant to the sludge, a sludge storage box being installed at the right end of the sludge moisture content meter, one end of a sludge return pipe being installed at the bottom of the sludge distributor, the other end of the sludge return pipe being connected to the liquid inlet of the sludge pump, and a sludge discharge pipe being installed at the liquid outlet of the sludge storage box.

[0008] Preferably, the sludge pre-concentration mechanism includes a mud trough, a spiral homogenizer is welded to the inner wall of the mud trough, a filter inner membrane is horizontally installed at the center of the spiral homogenizer, the right end of the filter inner membrane is used for sewage discharge, and pores are evenly opened on the surface of the filter inner membrane, through which water molecules and small molecules in the sludge are filtered out, a supernatant trough is provided in the inner cavity of the filter inner membrane, a mud inlet and a mud outlet are respectively installed at the left and right ends of the top of the mud trough, the mud inlet is connected to the sludge pump and the flocculant doser, and the mud outlet is connected to the sludge distributor, one end of the one-way valve is installed at the left end of the filter inner membrane, the one-way valve prevents water molecules entering the supernatant tank from being discharged from the left, and the other end of the one-way valve is installed with an anti-blocking component; Under the action of pressure, the sludge continuously rotates and collides along the spiral homogenizer, and presents a turbulent flow state, achieving the effect of uniform sludge. The water molecules and small molecular substances contained in the sludge in the mud tank pass through the filter inner membrane under the action of pressure and enter the supernatant tank, reducing the water content of the sludge in the mud tank.

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

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

[0011] Preferably, the anti-blocking component includes a vibration tube installed at the left end of the one-way valve, a shell is installed on the outer wall of the vibration tube, an air supply unit and a first gear are installed on the left and right sides of the outer wall of the vibration tube respectively, 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 vibration tube to vibrate, and a driver is installed at the bottom of the inner cavity of the shell, which drives the air supply unit and the first gear to operate.

[0012] Preferably, the air supply unit includes a fan cover installed at the left end of the vibration tube, a filter is installed on the left side wall of the fan cover, and dust in the air is filtered out by the filter, a rotatable crankshaft is installed at the center of the left side wall of the fan cover through a bearing, and a fan blade is installed on the right end of the outer wall of the crankshaft, and when the fan blade rotates, a wind force from left to right is generated, and one end of a 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 shaft; The rotation of the fan blades generates wind, which transports gas to the supernatant tank, and the pressurized gas clears the pores.

[0013] Preferably, the eccentric unit comprises a rotating rod mounted on the right side wall of the first gear, a screw is screwed to the inner cavity of the rotating rod, a nut is screwed to the outer wall of the screw, and when the nut is screwed into contact with the rotating rod, the screw is positioned, and an eccentric block is mounted on the top of the screw; The eccentric block performs eccentric rotational motion to cause the vibration tube to vibrate, thereby causing the filter inner membrane to vibrate.

[0014] Preferably, the eccentric block and the screw are installed via a jackscrew.

[0015] The sludge pre-concentration device proposed in the present invention has the following beneficial effects: 1. The present invention increases the sludge pressure through a sludge pump and then enters the sludge tank. Under the action of pressure, the sludge continuously rotates and collides along the spiral homogenizer, and presents a turbulent flow state, thereby achieving the effect of uniform sludge. The water molecules and small molecular substances contained in the sludge pass through the pores under the action of pressure and enter the supernatant tank, reducing the water content of the sludge in the sludge tank. The treated sludge flows out through the mud outlet, completing the sludge pre-concentration process, which can not only reduce the water content of the remaining sludge, reduce the volume of the sludge, and shorten the time required for sludge concentration, but also homogenize the sludge, reduce the use of flocculants, and reduce operating costs. The entire process has a high degree of automation and does not generate unnecessary labor costs.

[0016] 2. The present invention drives one end of the connecting rod to perform circular motion through a turntable, and the other end of the connecting rod pulls the fan blades on the crankshaft to rotate, blowing air into the upper 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 perform centrifugal motion. Since the direction of the external force applied to the vibrating tube constantly changes, the filter inner membrane vibrates, thereby achieving pore dredging and ensuring sludge concentration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is the main cross-sectional view of the sludge pre-thickening mechanism; Figure 3 It is the sludge movement path diagram of the sludge pre-thickening mechanism; Figure 4 This is the main cross-sectional view of the anti-blocking component; Figure 5 for Figure 4 The local structure diagram in ; Figure 6 This is a main cross-sectional view of the air supply component; Figure 7 Schematic diagram of the eccentric unit structure.

[0018] Figure: 1, sludge pump; 2, sludge pre-concentration mechanism; 3, flocculant doser; 4, sludge distributor; 5, sludge moisture content meter; 6, sludge storage tank; 7, sludge return pipe; 8, sludge discharge pipe; 21, sludge trough; 22, spiral homogenizer; 23, filter inner membrane; 24, pores; 25, supernatant tank; 26, sludge inlet; 27, sludge outlet; 28, one-way valve; 29, anti-blocking component; 291, vibration tube; 2 92. Casing; 293. Air supply unit; 294. First gear; 295. Eccentric unit; 296. Driver; 2931. Fan cover; 2932. Filter; 2933. Crankshaft; 2934. Fan blades; 2935. Connecting rod; 2951. Rotating rod; 2952. Screw; 2953. Nut; 2954. Eccentric block; 2961. Dual-axis motor; 2962. Turntable; 2963. Second gear. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 7 The present invention provides a technical solution: a sludge pre-concentration device, comprising a sludge pump 1, through which sludge in a sludge pool is extracted, a sludge pre-concentration mechanism 2 is installed at the liquid outlet of the sludge pump 1, a flocculant doser 3 and a sludge distributor 4 are installed at the left and right ends of the top of the sludge pre-concentration mechanism 2 respectively, a sludge moisture content meter 5 is installed on the right wall of the sludge distributor 4, the moisture content in the sludge is measured by the sludge moisture content meter 5, and the flocculant doser 3 adds an appropriate amount of flocculant to the sludge, a sludge storage box 6 is installed at the right end of the sludge moisture content meter 5, one end of a sludge return pipe 7 is installed at the bottom of the sludge distributor 4, the other end of the sludge return pipe 7 is connected to the liquid inlet of the sludge pump 1, and a sludge discharge pipe 8 is installed at the liquid outlet of the sludge storage box 6.

[0021] The sludge pump 1 pressurizes the sludge in the sludge tank and transports it to the sludge pre-concentration mechanism 2. At the same time, the flocculant doser 3 quantitatively adds flocculant to the pre-concentration mechanism 2 according to the feedback signal of the moisture content meter 5 to promote the agglomeration of sludge particles; the pre-concentrated sludge enters the sludge distributor 4 through the mud outlet 27, and the moisture content is detected in real time by the moisture content meter 5: if the moisture content is ≤ the set threshold, the distributor 4 controls the valve to open, and the sludge flows into the mud storage tank 6 and is discharged to the concentration tank or dehydration equipment through the discharge pipe 8; if the moisture content is greater than the set threshold, the distributor 4 switches the valve to allow the sludge to return to the sludge pump 1 through the reflux pipe 7, mix with the newly extracted sludge, and then enter the pre-concentration mechanism 2 again to achieve cyclic concentration.

[0022] As a preferred solution, further combining Figure 1-Figure 3 As shown, the sludge pre-concentration mechanism 2 includes a mud trough 21, a spiral homogenizer 22 is welded to the inner wall of the mud trough 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, and pores 24 are evenly opened on the surface of the filter inner membrane 23. Water molecules and small molecules in the sludge are filtered out through the pores 24. A supernatant trough 25 is provided in the inner cavity of the filter inner membrane 23. A mud inlet 26 and a mud outlet 27 are respectively installed at the left and right ends of the top of the mud trough 21. The mud inlet 26 is connected to the sludge pump 1 and the flocculant doser 3, and the mud outlet 27 is connected to the sludge distributor 4. A one-way valve 28 is installed at one end of 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, and an anti-blocking component 29 is installed at the other end of the one-way valve 28.

[0023] As a preferred solution, further, the spiral homogenizer 22 is spiral-shaped, and the sludge entering the mud tank 21 from the mud inlet 26 flows along the spiral homogenizer 22, and the sludge rotates, collides and presents a turbulent flow state.

[0024] As a preferred solution, further, the filter inner membrane 23 has a tubular structure and is made of a polymer membrane material, which improves the corrosion resistance of the filter inner membrane 23 and extends the service life of the filter inner membrane 23.

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

[0026] More specifically, the one-way valve 28 at the left end of the filter inner membrane 23 adopts a rubber flap one-way valve, which only allows the liquid in the supernatant tank 25 to flow to the right to prevent sludge from backflowing and contaminating the filtrate. The left end of the one-way valve 28 is connected to the anti-blocking component 29 to clear the blockage on the surface of the pore 24 through periodic vibration and airflow blowing. When the sludge pump 1 pressurizes and delivers the sludge (water content above 99%) to the sludge inlet 26, the sludge and the flocculant dosing device 3 are initially mixed in the sludge inlet pipe, and then enter the sludge tank 21 and flow along the spiral homogenizer 22. Due to the guiding effect of the spiral homogenizer 22, the sludge generates a spiral propulsion rotation state, and high-frequency collisions occur between particles and form turbulence, achieving homogenization (such as Figure 3Under the pressure in the mud tank 21, the free water and small molecules in the sludge pass through the pores 24 of the filter inner membrane 23 into the supernatant tank 25 and are discharged through the sewage discharge pipe at the right end; while the solid particles are retained to form pre-concentrated sludge with a moisture content reduced to 97%-98%, which enters the sludge distributor 4 from the mud outlet 27.

[0027] As a preferred solution, further, the anti-blocking component 29 includes a vibration tube 291 installed at the left end of the one-way valve 28, and a shell 292 is installed on the outer wall of the vibration tube 291. An air supply unit 293 and a first gear 294 are installed on the left and right sides of the outer wall of the vibration tube 291 respectively. 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 acting on the vibration tube 291 to change continuously, thereby causing the vibration tube 291 to vibrate. A driver 296 is installed at the bottom of the inner cavity of the shell 292, and the air supply unit 293 and the first gear 294 are driven to operate by the driver 296; the driver 296 includes a dual-axis motor 2961 installed at the bottom of the inner wall of the shell 292, and a turntable 2962 and a second gear 2963 are installed on the left and right output ends of the dual-axis motor 2961 respectively, and the second gear 2963 is meshed with the first gear 294.

[0028] As a preferred solution, further, the air supply unit 293 includes a fan cover 2931 installed at the left end of the vibration tube 291, and a filter 2932 is installed on the left side wall of the fan cover 2931, through which dust in the air is filtered out, and a rotatable crankshaft 2933 is installed at the center position of the left side wall of the fan cover 2931 through a bearing, and a fan blade 2934 is installed at the right end of the outer wall of the crankshaft 2933, and when the fan blade 2934 rotates, a wind force from left to right is generated, and one end of a connecting rod 2935 is sleeved on the left end of the crankshaft 2933, and the other end of the connecting rod 2935 is connected to the outer edge of the left side wall of the turntable 2962 through a pin shaft.

[0029] After the dual-axis motor 2961 is started, the turntable 2962 at its left output end performs a circular motion, driving the crankshaft 2933 to rotate around the bearing axis through the connecting rod 2935, and then driving the fan blades 2934 to rotate at high speed. The external air is filtered by the filter 2932 and enters from the air inlet on the left side of the fan cover 2931. Under the push of the fan blades 2934, a directional airflow from left to right is formed, and pressurized gas is transported to the upper clear liquid tank 25 through the vibration tube 291. The airflow can purge the pores 24 on the surface of the filter inner membrane 23, and cooperate with the vibration effect of the eccentric unit 295 to effectively remove blockages and ensure the permeability of the filter inner membrane 23.

[0030] As a preferred solution, further, the eccentric unit 295 includes a rotating rod 2951 installed on the right side wall of the first gear 294, the inner cavity of the rotating rod 2951 is threaded with a screw 2952, and the outer wall of the screw 2952 is threaded with a nut 2953. When the nut 2953 is screwed into contact with the rotating rod 2951, the screw 2952 is positioned. An eccentric block 2954 is installed on the top of the screw 2952, and the eccentric block 2954 and the screw 2952 are installed by a top screw. The eccentric blocks 2954 of different weights can be replaced, thereby changing the vibration energy of the vibration 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 eccentric weight 2954 perform circular motion along with the rotating rod 2951. Because the center of gravity of the eccentric weight 2954 is offset from the rotation axis, it generates periodic centrifugal force during rotation, causing the vibrating tube 291 to vibrate due to the alternating external force. This force is then transmitted to the inner filter membrane 23, causing blockages in the pores 24 on its surface to loosen and fall off.

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

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

[0034] The vibration intensity can be adjusted to ensure that the filter inner membrane 23 maintains high efficiency and permeability during long-term use, and cooperates with the air flow blowing of the air supply unit 293 to effectively prevent the pores 24 from being blocked.

[0035] The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process. The specific operations are as follows.

[0036] Step 1: When in use, the sludge is first pressurized by the sludge pump 1 and enters the mud tank 21 through the mud inlet 26. Under the action of pressure, it continuously rotates and collides along the spiral homogenizer 22, and presents a turbulent flow state, thereby achieving the effect of uniform sludge. The water molecules and small molecules contained in the sludge in the mud tank 21 pass through the filter inner membrane 23 under the action of pressure and enter the supernatant tank 25, reducing the water content of the sludge in the mud tank 21. The treated sludge flows out through the mud 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 measuring instrument 5 can measure the moisture content of the sludge in real time. If the moisture content is greater than a certain value, it transmits a signal to the sludge distributor 4, causing the sludge in the sludge distributor 4 to flow to the sludge return pipe 7 and eventually flow back to the sludge pump 1 for repeated pre-concentration. At the same time, it transmits a signal to the flocculant doser 3, which starts dosing the flocculant. If the moisture content is lower than a certain value, the sludge in the sludge distributor 4 flows into the sludge storage tank 6. Step 3: When impurities adsorbed on the pores 24 need to be removed, the dual-axis 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. The other end of the connecting rod 2935 pulls the crankshaft 2933 to rotate. The rotation of the fan blades 2934 generates wind force. The air is filtered by the filter 2932 and enters the vibration tube 291. The air is pressurized in the supernatant tank 25. At the same time, 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 vibration tube 291 to have a tendency to move outward. The direction of the external force constantly changes, causing the vibration tube 291 to vibrate, thereby vibrating the filter inner membrane 23, loosening impurities on the pores 24. The airflow blows away the impurities, removes impurities from the filter inner membrane 23, and reduces the sludge moisture content during sludge pre-concentration. Step 4. When it is necessary to adjust the vibration effect of the filter inner membrane 23, screw 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 close to the vibration tube 291 to change the centrifugal force when the eccentric block 2954 rotates. You can also replace the eccentric block 2954 with a different mass to change the centrifugal force, thereby adjusting the vibration effect of the vibration tube 291 to help clean the pores 24.

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

Claims

1. A sludge pre-concentration device, comprising a sludge pump (1), for extracting sludge from a sludge tank through the sludge pump (1), characterized in that: The sludge pump (1) is provided with a sludge pre-concentration mechanism (2) at its liquid outlet. A flocculant doser (3) and a sludge distributor (4) are respectively provided at the left and right ends of the top of the sludge pre-concentration mechanism (2). A sludge moisture content meter (5) is provided on the right side wall of the sludge distributor (4). The sludge moisture content meter (5) measures the moisture content in the sludge, and the flocculant doser (3) adds an appropriate amount of flocculant to the sludge. A sludge storage box (6) is provided at the right end of the sludge moisture content meter (5). One end of a sludge return pipe (7) is provided at the bottom of the sludge distributor (4). The other end of the sludge return pipe (7) is connected to the liquid inlet of the sludge pump (1). A sludge discharge pipe (8) is provided at the liquid outlet of the sludge storage box (6).

2. A sludge pre-concentration device according to claim 1, characterized in that: The sludge pre-concentration mechanism (2) includes a mud trough (21), the inner wall of the mud trough (21) is welded with a spiral homogenizer (22), a filter inner membrane (23) is installed horizontally 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), and the inner cavity of the filter inner membrane (23) is provided with a supernatant tank (25 ), a mud inlet (26) and a mud outlet (27) are respectively installed at the left and right ends of the top of the mud trough (21), the mud inlet (26) is connected to the sludge pump (1) and the flocculant doser (3), and the mud outlet (27) is connected to the sludge distributor (4). A one-way valve (28) is installed at one end of the filter inner membrane (23), and 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 installed with an anti-blocking component (29).

3. A sludge pre-concentration device according to claim 2, characterized in that: The spiral homogenizer (22) is spiral-shaped.

4. A sludge pre-concentration device according to claim 3, characterized in that: The filtration inner membrane (23) has a tubular structure and is made of a polymer membrane material.

5. A sludge pre-concentration device according to claim 4, characterized in that: The anti-blocking component (29) includes a vibration tube (291) installed at the left end of the one-way valve (28), a shell (292) is installed on the outer wall of the vibration tube (291), and an air supply unit (293) and a first gear (294) are installed on the left and right sides of the outer wall of the vibration tube (291), respectively. 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 vibration tube (291) to vibrate. A driver (296) is installed at the bottom of the inner cavity of the shell (292), and the air supply unit (293) and the first gear (294) are driven to operate by the driver (296).

6. A sludge pre-concentration device according to claim 5, characterized in that: The air supply unit (293) comprises a fan cover (2931) mounted on the left end of the vibration tube (291); a filter (2932) is mounted on the left side wall of the fan cover (2931); dust in the air is filtered out by the filter (2932); a rotatable crankshaft (2933) is mounted via a bearing at the center of the left side wall of the fan cover (2931); a fan blade (2934) is mounted on the right end of the outer wall of the crankshaft (2933); when the fan blade (2934) rotates, a wind force from left to right is generated; 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 output end of the driver (296) via a pin.

7. A sludge pre-concentration device according to claim 6, characterized in that: The eccentric unit (295) comprises a rotating rod (2951) mounted on the right side wall of the first gear (294); a screw rod (2952) is threadedly connected to the inner cavity of the rotating rod (2951); a nut (2953) is threadedly connected to the outer wall of the screw rod (2952); when the nut (2953) is screwed and contacts the rotating rod (2951), the screw rod (2952) is positioned; and an eccentric block (2954) is mounted on the top of the screw rod (2952).

8. The sludge pre-concentration device according to claim 7, characterized in that: The eccentric block (2954) and the screw rod (2952) are installed via a top screw.

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