Cleaning device and tubular membrane wastewater pretreatment system

Abstract

The utility model relates to a cleaning device and a tubular membrane wastewater pretreatment system, the cleaning device is used for the tubular membrane wastewater pretreatment system, the tubular membrane wastewater pretreatment system comprises a concentration tank, a tubular membrane module and a sludge tank, the concentration tank discharges sludge at the bottom into the sludge tank, a water pump is turned on while a sludge pump is turned on, and the water pump pumps water from a water source to a nozzle. A motor is started, the motor drives a gear to move along a rack, so that a sliding block moves along an annular sliding rail, the nozzle sprays water around the inner wall of the sludge tank, sludge on the inner wall of the sludge tank is washed to the bottom of the sludge tank by water, and the sludge washed by water is pumped by a sludge pump to a filter press for filter pressing treatment. By arranging the cleaning device on the sludge tank, sludge attached to the inner wall of the sludge tank is pumped by the sludge pump, the sludge tank is kept in a clean state, hardening of the sludge on the inner wall and the bottom of the sludge tank is avoided, the sludge pump keeps working normally for a long time, the sludge tank does not need to be manually cleaned regularly, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a cleaning device and a tubular membrane wastewater pretreatment system. Background Technology

[0002] Currently, the tubular membrane wastewater pretreatment system includes a first reaction tank, a second reaction tank, a thickening tank, a sludge tank, a filter press, a tubular membrane module, a permeate tank, and an evaporation crystallization module. Wastewater is treated sequentially through the first reaction tank, the second reaction tank, the thickening tank, the tubular membrane module, the permeate tank, and the evaporation crystallization module. During this process, the wastewater circulates between the thickening tank and the tubular membrane. Water that has permeated through the membrane enters the permeate tank. The sludge formed after adding chemical agents to the wastewater in the reaction tank is periodically discharged from the thickening tank to the sludge tank. The sludge in the sludge tank is then pumped by a sludge pump to the filter press for filtration. Because residual sludge remains on the inner wall of the sludge tank after the sludge pump is pumped out, long-term sludge accumulation causes the sludge on the inner wall and bottom of the sludge tank to harden, making it difficult for the sludge pump to pump out the sludge. This requires regular manual cleaning by staff, increasing labor costs.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a tubular membrane wastewater pretreatment system to solve the problem of sludge hardening on the inner wall and bottom of the sludge tank due to long-term sludge accumulation, which makes it difficult for the sludge pump to extract the sludge and requires regular manual cleaning by staff, increasing labor costs.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A cleaning device is used in a tubular membrane wastewater pretreatment system. The tubular membrane wastewater pretreatment system includes a thickening tank, a tubular membrane module, and a sludge tank. The thickening tank and the sludge tank are connected by a pipeline. The tubular membrane module is equipped with a backwashing device, which washes away particles retained on the membrane surface inside the tubular membrane module and allows them to settle in the thickening tank. The top of the sludge tank is equipped with a water pump, and the inner side of the top of the sludge tank is equipped with an annular slide rail, with a toothed rack annularly arranged on the inner side of the annular slide rail.

[0007] The cleaning device includes a drive assembly and a nozzle. The drive assembly includes a slider, a motor, and a gear. The slider is located at the lower end of the annular slide rail. The outer side of the slider is hooked to the lower end of the annular slide rail and can slide along the annular slide rail. The motor is located at the lower end of the slider. The output end of the motor is connected to the gear. The gear meshes with the rack. The nozzle is located on the slider and its output end faces the inner wall of the sludge tank. The input end of the nozzle is connected to the output end of the water pump. The input end of the water pump is connected to a water source.

[0008] A further technical solution is that the annular slide rail includes a first ring portion, a cylindrical portion, and a second ring portion. The first ring portion and the second ring portion are horizontally arranged, and the cylindrical portion is vertically arranged. The upper end of the cylindrical portion is connected to the inner side of the first ring portion, and the lower end of the cylindrical portion is connected to the upper end of the second ring portion. The outer sides of the first ring portion, the cylindrical portion, and the second ring portion form a limiting annular groove.

[0009] The upper outer side of the slider has a first hook, the shape of which matches the limiting ring groove, and the first hook can be slidably inserted into the limiting ring groove.

[0010] The gear is connected to the motor output end via a rotating shaft. The gear, rotating shaft, and slider form a second annular groove, and the inner side of the second ring portion is engaged in the second annular groove.

[0011] A further technical solution is that the nozzle is an omnidirectional direct-fire nozzle.

[0012] A further technical solution is that a water tank is provided outside the sludge tank, and the input end of the water pump is connected to the water tank.

[0013] A further technical solution is that the water tank is equipped with a heating device.

[0014] A further technical solution is that the concentration tank is equipped with a stirrer.

[0015] This utility model also discloses a tubular membrane wastewater pretreatment system, which includes a first reaction tank, a second reaction tank, a thickening tank, a tubular membrane module, a product water tank, an evaporation crystallization module, a sludge tank, a filter press, and a cleaning device.

[0016] The cleaning device, as described above, is located at the top of the sludge tank;

[0017] The first reaction tank, the second reaction tank, the thickening tank, the tubular membrane module, the product water tank, and the evaporation crystallization module are connected in sequence by pipelines. The second reaction tank, the thickening tank, the sludge tank, and the filter press are connected in sequence by pipelines to form a circulation loop.

[0018] A circulation pump is installed between the thickening tank and the tubular membrane module pipeline. Wastewater is circulated between the thickening tank and the tubular membrane module through the circulation pump. Clean water is filtered through the tubular membrane module and discharged into the product water tank. The sludge filtered out by the tubular membrane module is returned to the thickening tank.

[0019] A sludge pump is provided between the sludge tank and the filter press pipeline. The input end of the sludge pump is connected to the bottom of the sludge tank, and the output end of the sludge pump is connected to the filter press.

[0020] A further technical solution is that the first reaction tank is equipped with a magnesium dosing device and a liquid alkali dosing device, and magnesium and liquid alkali are respectively added to the first reaction tank. The second reaction tank is equipped with a liquid alkali dosing device and a coagulant dosing device, and liquid alkali and coagulant are respectively added to the second reaction tank.

[0021] A further technical solution is that the concentration tank is equipped with an activated carbon dosing device, and activated carbon is added into the concentration tank.

[0022] The beneficial effects of this utility model embodiment are as follows:

[0023] (i) Cleaning device, used in the tubular membrane wastewater pretreatment system. The tubular membrane wastewater pretreatment system includes a thickening tank, tubular membrane modules, and a sludge tank. Wastewater flows into the thickening tank, and the circulation pump is turned on. The wastewater is transported between the thickening tank and the tubular membrane modules through the circulation pump. The purified water is filtered out through the tubular membrane modules. The backwashing device is turned on to wash away the particles retained on the inner surface of the tubular membrane modules, which then enter the thickening tank for sedimentation. The bottom sludge of the thickening tank is discharged into the sludge tank. At the same time as the sludge pump is turned on, the water pump is turned on. The water pump draws water from the water source to the nozzles, and the nozzles spray water to wash the inner wall of the sludge tank. The motor is started, and the motor drives the gear to move along the rack, causing the slider to move along the annular slide rail. This causes the nozzle to spray water around the inner wall of the sludge tank, washing the sludge on the inner wall to the bottom of the sludge tank. The washed-off sludge is then pumped by the sludge pump to the filter press for filtration. By installing a cleaning device on the sludge tank, the sludge adhering to the inner wall of the sludge tank is also pumped out by the sludge pump, keeping the sludge tank clean and preventing the sludge from hardening on the inner wall and bottom of the sludge tank. This allows the sludge pump to work normally for a long time without the need for regular manual cleaning of the sludge tank, thus improving work efficiency. (ii) Furthermore, a water tank is also provided on the outside of the sludge tank. The water pump input end is connected to the water tank. A heating device is provided in the water tank. After the water tank is full of water, the heating device is turned on. After the heating device heats the water to a certain temperature, the water pump is turned on. The water pump draws hot water from the water tank to the nozzle. The nozzle sprays hot water to wash the inner wall of the sludge tank. The hot water is used to wash the sludge attached to the inner wall and bottom of the sludge tank, reducing the viscosity of the sludge and making the sludge more effectively washed by the cleaning device, which further improves the working efficiency of the sludge pump. Attached Figure Description

[0024] Figure 1 This is a simplified structural diagram of the tubular membrane wastewater pretreatment system of this utility model.

[0025] Figure 2 This is a cross-sectional structural diagram of the sludge tank in the tubular membrane wastewater pretreatment system of this utility model.

[0026] Figure 3 for Figure 2 Enlarged view at point A.

[0027] Figure 4 for Figure 2 Enlarged view at point B.

[0028] In the picture:

[0029] 1. First reaction tank; 2. Second reaction tank; 3. Thickening tank; 4. Tubular membrane module; 5. Product water tank; 6. Evaporation and crystallization module; 7. Sludge tank; 71. Sludge pump; 72. Cleaning device; 721. Nozzle; 722. Slider; 723. Motor; 724. Gear; 725. First hook; 73. Annular slide rail; 731. First ring; 732. Cylinder; 733. Second ring; 734. Rack; 735. Limiting ring groove; 74. Water tank; 75. Heating device; 76. Water pump; 8. Filter press; 9. Circulation pump. Detailed Implementation

[0030] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the device proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only used to conveniently and clearly assist in illustrating the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0032] First embodiment:

[0033] Figure 1 This is a simplified structural diagram of the tubular membrane wastewater pretreatment system of this utility model. Figure 1As shown, the cleaning device 72 is used in the tubular membrane wastewater pretreatment system. The tubular membrane wastewater pretreatment system includes a thickening tank 3, a tubular membrane module 4, and a sludge tank 7. The thickening tank 3 and the sludge tank 7 are connected by a pipeline. The tubular membrane module 4 is equipped with a backwashing device. The backwashing device washes the particles retained on the inner membrane surface of the tubular membrane module 4 and sends them into the thickening tank 3 for sedimentation. The top of the sludge tank 7 is equipped with a water pump 76. The inner side of the top of the sludge tank 7 is equipped with an annular slide rail 73, and the inner side of the annular slide rail 73 is equipped with a toothed rack 734.

[0034] Figure 2 This is a cross-sectional structural diagram of the sludge tank in the tubular membrane wastewater pretreatment system of this utility model. Figure 3 for Figure 2 Enlarged view at point A. Figure 4 for Figure 2 A magnified view at point B. (See image below.) Figures 2-4 As shown, the cleaning device 72 includes a drive assembly and a nozzle 721. The drive assembly includes a slider 722, a motor 723, and a gear 724. The motor 723 is reversible, and can be, for example, a DC motor, an AC inverter motor, or a stepper motor, to prevent the hose connecting the output end of the water pump 76 to the input end of the nozzle 721 from tangling. The slider 722 is located at the lower end of the annular slide rail 73, and the motor 723 is located at the lower end of the slider 722. The output end of the motor 723 is connected to the gear 724, which meshes with a rack 734. The nozzle 721 is mounted on the slider 722 with its output end facing the inner wall of the sludge tank 7. The input end of the nozzle 721 is connected to the output end of the water pump 76, and the input end of the water pump 76 is connected to a water source. For example, the nozzle 721 is a universal direct-spray nozzle.

[0035] like Figures 2-4 As shown, the annular slide rail 73 further includes a first ring portion 731, a cylindrical portion 732, and a second ring portion 733. The first ring portion 731 and the second ring portion 733 are horizontally arranged, while the cylindrical portion 732 is vertically arranged. The upper end of the cylindrical portion 732 is connected to the inner side of the first ring portion 731, and the lower end of the cylindrical portion 732 is connected to the upper end of the second ring portion 733. The first ring portion 731, the cylindrical portion 732, and the second ring portion 733 are coaxially arranged with the sludge tank 7. The outer sides of the second ring portion 733 form a limiting ring groove 735. The upper outer side of the slider 722 has a first hook portion 725, the shape of which matches the limiting ring groove 735. The first hook portion 725 can be slidably engaged in the limiting ring groove 735. For example, the first hook portion is a roller, which is connected to the slider through a rotating shaft. When the gear 724 rolls, the roller slides along the limiting ring groove 735 to prevent the slider 722 from falling off when the annular slide rail 73 moves.

[0036] Gear 724 is connected to the output end of motor 723 via a rotating shaft. Gear 724, rotating shaft and slider 722 form a second annular groove. The inner side of the second ring 733 is inserted into the second annular groove.

[0037] like Figure 2 As shown, a water tank 74 is further provided on the outside of the sludge tank 7, and the input end of the water pump 76 is connected to the water tank 74.

[0038] like Figure 2 As shown, the water tank 74 is further equipped with a heating device 75. For example, the heating device 75 is an electric heating element.

[0039] In operation, this embodiment is as follows:

[0040] Wastewater in thickener 3 utilizes cross-flow filtration technology. Driven by circulating pump 9, the wastewater surface flows parallel to the membrane surface. The shear force generated when the wastewater flows across the membrane surface carries away the particles retained on the membrane surface, keeping the fouling layer at a relatively thin level. The purified water permeates through the membrane and is discharged into permeate tank 5. The backwashing device of tubular membrane module 4 is activated, using purified water from permeate tank 5 to rinse the particles retained on the membrane surface inside the tubular membrane and allow them to settle in thickener 3. The sludge settled at the bottom of thickener 3 is discharged into sludge tank 7. Simultaneously, sludge pump 71 is activated, and water pump 76 is turned on. Water pump 76 draws hot water from water tank 74 to nozzle 721. The nozzle 721 sprays hot water to rinse the inner wall of the sludge tank 7. The motor 723 is started and rotates forward. The motor 723 drives the gear 724 to move along the rack 734. The slider 722 moves clockwise around the inner wall of the sludge tank 7 once along the annular slide rail 73. Then the motor 723 reverses and the slider 722 moves counterclockwise around the inner wall of the sludge tank 7 once along the annular slide rail 73. The slider 722 moves in this cyclical manner. The nozzle 721 sprays hot water around the inner wall of the sludge tank 7. The sludge on the inner wall of the sludge tank 7 is washed to the bottom of the sludge tank 7 by the water. The sludge washed by the water is pumped out by the sludge pump 71.

[0041] In this embodiment, after adding chemical reagents to the first reaction tank 1 and the second reaction tank 2, the wastewater flows into the thickening tank 3. The circulation pump 9 is then turned on, and the wastewater circulates between the thickening tank 3 and the tubular membrane module 4 via the circulation pump 9. The purified water is filtered through the tubular membrane module 4 and discharged into the product water tank 5. The sludge filtered out by the tubular membrane module 4 is returned to the thickening tank 3. The bottom sludge of the thickening tank 3 is discharged into the sludge tank 7. Simultaneously, the sludge pump 71 is turned on, and the water pump 76 is activated. The water pump 76 draws water from the water source to the nozzle 721, which sprays water to rinse the inner wall of the sludge tank 7. The motor 723 is then started, driving the gear 72. 4. The slider 722 moves along the annular slide rail 73, causing the nozzle 721 to spray water around the inner wall of the sludge tank 7. The sludge on the inner wall of the sludge tank 7 is washed to the bottom of the sludge tank 7 by the water. The sludge washed by the water is pumped by the sludge pump 71 to the filter press 8 for filter pressing. By setting the cleaning device 72 on the sludge tank 7, the sludge attached to the inner wall of the sludge tank 7 is also pumped out by the sludge pump 71, keeping the sludge tank 7 clean. This avoids the sludge on the inner wall and bottom of the sludge tank 7 from hardening, allowing the sludge pump 71 to work normally for a long time without the need for manual cleaning of the sludge tank 7, thus improving work efficiency.

[0042] Second embodiment:

[0043] This embodiment discloses a tubular membrane wastewater pretreatment system.

[0044] like Figure 1 As shown, the tubular membrane wastewater pretreatment system includes a first reaction tank 1, a second reaction tank 2, a thickener 3, a sludge tank 7, a filter press 8, a tubular membrane module 4, a product water tank 5, and an evaporation crystallization module 6. The first reaction tank 1, the second reaction tank 2, the thickener 3, the tubular membrane module 4, the product water tank 5, and the evaporation crystallization module 6 are connected sequentially by pipelines. The second reaction tank 2, the thickener 3, the sludge tank 7, and the filter press 8 are connected sequentially by pipelines to form a circulation loop.

[0045] like Figure 1 As shown, a circulation pump 9 is installed between the thickener 3 and the tubular membrane module 4. Wastewater is circulated between the thickener 3 and the tubular membrane module 4 via the circulation pump 9. Clean water is filtered through the tubular membrane module 4 and discharged into the product water tank 5. The sludge filtered out by the tubular membrane module 4 is returned to the thickener 3. The circulation pump 9 has a frequency converter control function, and its flow rate is 104 m³ / h. 3 The pump has a head of 35m and a power of 18.5kw, and is made of 316L stainless steel.

[0046] like Figure 1 As shown, a sludge pump 71 is installed between the sludge tank 7 and the filter press 8. The input end of the sludge pump 71 is connected to the bottom of the sludge tank 7, and the output end of the sludge pump 71 is connected to the filter press 8. The sludge pump 71 is a 1.5-inch pneumatic diaphragm pump.

[0047] Furthermore, a stirrer is installed inside the thickening tank 3. The stirrer has a rotation speed of 72 rpm, a power of 0.75 kW, and is made of carbon steel lined with plastic.

[0048] Furthermore, the first reaction tank 1 is equipped with a magnesium dosing device and a liquid alkali dosing device, which respectively add magnesium and liquid alkali into the first reaction tank 1. The second reaction tank 2 is equipped with a liquid alkali dosing device and a coagulant dosing device, which respectively add liquid alkali and coagulant into the second reaction tank 2.

[0049] Furthermore, the thickening tank 3 is equipped with an activated carbon dosing device, into which activated carbon is added.

[0050] In operation, this embodiment is as follows:

[0051] The tubular membrane wastewater pretreatment system introduces treated wastewater. The wastewater passes through the first reaction tank 1, where the magnesium dosing device and liquid alkali dosing device are activated to add magnesium and liquid alkali to the wastewater, ensuring a thorough reaction. The wastewater then enters the second reaction tank 2, where the liquid alkali dosing device and coagulant dosing device are activated to add liquid alkali and coagulant, performing a preliminary pH adjustment to further enhance the reaction between the wastewater and the coagulant. Finally, the wastewater enters the thickening tank 3, where a mixer is activated to agitate the wastewater and chemicals, accelerating the reaction between the wastewater and the thickening agents. The reaction causes the sludge to settle more quickly and separate into layers with the liquid. In the thickener 3, wastewater utilizes cross-flow filtration technology. Driven by the circulating pump 9, the wastewater surface flows parallel to the membrane surface. The shear force generated as the wastewater flows across the membrane surface carries away the particles retained on the membrane, keeping the fouling layer at a relatively thin level. The purified water permeates through the membrane and flows into the permeate tank 5. The backwashing device of the tubular membrane module 4 is activated, using purified water from the permeate tank 5 to flush away the particles retained on the inner surface of the tubular membrane, which then enters the thickener 3 for sedimentation. 3. Discharge the bottom sedimented sludge into sludge tank 7. Simultaneously turn on sludge pump 71 and water pump 76. Water pump 76 draws hot water from water tank 74 to nozzle 721. Nozzle 721 sprays hot water to rinse the inner wall of sludge tank 7. Start motor 723. Motor 723 rotates forward, driving gear 724 to move along rack 734. Slider 722 moves clockwise around the inner wall of sludge tank 7 once along annular slide rail 73. Then motor 723 reverses, and slider 722 moves counterclockwise along annular slide rail 73. The needle moves around the inner wall of the sludge tank 7 in one revolution, and the slider 722 moves in the same way. The nozzle 721 sprays hot water around the inner wall of the sludge tank 7, and the sludge on the inner wall of the sludge tank 7 is washed to the bottom of the sludge tank 7 by the water. The sludge washed by the water is pumped by the sludge pump 71 and discharged to the filter press 8 for filter pressing. The sludge cake produced after filter pressing is treated as hazardous solid waste by a professional company. The dewatering water from the filter press is returned to the second reaction tank 2. Finally, the purified water in the water production tank 5 enters the evaporation crystallization module 6 for evaporation crystallization operation.

[0052] In this embodiment, the staff turns on the magnesium dosing device and the liquid alkali dosing device, adding magnesium and liquid alkali into the wastewater to allow them to react fully. The wastewater then enters the second reaction tank 2. The liquid alkali dosing device and the coagulant dosing device are then turned on, adding liquid alkali and coagulant into the wastewater for pH coarse adjustment, making the reaction between the wastewater and the coagulant more complete. The wastewater then enters the thickening tank 3, where the agitator is turned on to accelerate the reaction between the wastewater and the chemicals, causing the sludge to settle more quickly and separate into layers with the liquid. By setting up the dosing device and the agitator, the formation and settling speed of sludge particles are accelerated, improving the efficiency of wastewater treatment.

[0053] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A cleaning device (72), characterized in that, For use in a tubular membrane wastewater pretreatment system, the tubular membrane wastewater pretreatment system includes a thickening tank (3), a tubular membrane module (4) and a sludge tank (7). The thickening tank (3) and the sludge tank (7) are connected by a pipeline. The tubular membrane module (4) is equipped with a backwashing device. The backwashing device washes the particles retained on the inner membrane surface of the tubular membrane module (4) into the thickening tank (3) for sedimentation. The sludge tank (7) is equipped with an annular slide rail (73) on the inner side of the top. The annular slide rail (73) is equipped with a toothed rack (734) on the inner side of the annular slide rail (73). The cleaning device (72) includes a drive assembly and a nozzle (721). The drive assembly includes a slider (722), a motor (723), and a gear (724). The slider (722) is located at the lower end of the annular slide rail (73). The outer side of the slider (722) is hooked to the lower end of the annular slide rail (73) and can slide along the annular slide rail (73). The motor (723) is located on the inner side of the lower end of the slider (722). The output end of the motor (723) is connected to the gear (724). The gear (724) meshes with the rack (734). The nozzle (721) is located on the slider (722) and its output end faces the inner wall of the sludge tank (7). The input end of the nozzle (721) is connected to the output end of the water pump (76), and the input end of the water pump (76) is connected to a water source.

2. The cleaning device according to claim 1, characterized in that: The annular slide rail (73) includes a first ring portion (731), a cylindrical portion (732), and a second ring portion (733). The first ring portion (731) and the second ring portion (733) are horizontally arranged, and the cylindrical portion (732) is vertically arranged. The upper end of the cylindrical portion (732) is connected to the inner side of the first ring portion (731), and the lower end of the cylindrical portion (732) is connected to the upper end of the second ring portion (733). The first ring portion (731), the cylindrical portion (732), and the second ring portion (733) are coaxially arranged with the sludge tank (7). The outer sides of the first ring portion (731), the cylindrical portion (732), and the second ring portion (733) form a limiting annular groove (735). The upper outer side of the slider (722) has a first hook (725), the shape of which matches the limiting ring groove (735), and the first hook (725) can be slidably inserted into the limiting ring groove (735); The gear (724) is connected to the output end of the motor (723) via a rotating shaft. The gear (724), the rotating shaft, and the slider (722) form a second annular groove, and the inner side of the second ring (733) is inserted into the second annular groove.

3. The cleaning device according to claim 1, characterized in that: The nozzle (721) is a universal direct-fire nozzle.

4. The cleaning device according to claim 1, characterized in that: A water tank (74) is also provided on the outside of the sludge tank (7), and a water pump (76) is located at the top of the sludge tank (7). The input end of the water pump (76) is connected to the water tank (74).

5. The cleaning device according to claim 4, characterized in that: The water tank (74) is equipped with a heating device (75).

6. A tubular membrane wastewater pretreatment system, comprising a first reaction tank (1), a second reaction tank (2), a thickening tank (3), a tubular membrane module (4), a product water tank (5), an evaporation crystallization module (6), a sludge tank (7), a filter press (8), and a cleaning device (72). The cleaning device (72) is the cleaning device (72) as described in any one of claims 1 to 5, and is disposed on the top of the sludge tank (7); The first reaction tank (1), the second reaction tank (2), the thickening tank (3), the tubular membrane module (4), the product water tank (5) and the evaporation crystallization module (6) are connected in sequence by pipelines. The second reaction tank (2), the thickening tank (3), the sludge tank (7) and the filter press (8) are connected in sequence by pipelines to form a circulation loop. A circulation pump (9) is provided between the thickening tank (3) and the tubular membrane module (4). Wastewater is circulated between the thickening tank (3) and the tubular membrane module (4) by the circulation pump (9). Clean water is filtered through the tubular membrane module (4) and discharged into the water production tank (5). The sludge filtered out by the tubular membrane module (4) is returned to the thickening tank (3). A sludge pump (71) is provided between the sludge tank (7) and the filter press (8) pipeline. The input end of the sludge pump (71) is connected to the bottom of the sludge tank (7), and the output end of the sludge pump (71) is connected to the filter press (8).

7. The tubular membrane wastewater pretreatment system according to claim 6, characterized in that: The concentration tank (3) is equipped with a mixer.

8. The tubular membrane wastewater pretreatment system according to claim 6, characterized in that: The first reaction tank (1) is equipped with a magnesium dosing device and a liquid alkali dosing device. The magnesium dosing device and the liquid alkali dosing device respectively add magnesium and liquid alkali into the first reaction tank (1). The second reaction tank (2) is equipped with a liquid alkali dosing device and a coagulant dosing device. The liquid alkali dosing device and the coagulant dosing device respectively add liquid alkali and coagulant into the second reaction tank (2).

9. The tubular membrane wastewater pretreatment system according to claim 6, characterized in that: The thickening tank (3) is equipped with an activated carbon dosing device, which adds activated carbon into the thickening tank (3).

Images