Automatic MCR membrane cleaning device and method for printing and dyeing wastewater treatment

Abstract

The invention discloses an MCR membrane automatic cleaning device and method for printing and dyeing wastewater treatment, and belongs to the technical field of sewage treatment. The cleaning device comprises a base used for installing and fixing the MCR membrane assembly, and guide pipes are symmetrically arranged at the opposite angles of the base; the protective cover is arranged above the base, guide rods are symmetrically arranged at the opposite angles of the protective cover, the guide rods are inserted into the guide pipes in a sliding manner, and the protective cover covers the whole MCR membrane module inside after being lifted by a lifting device; the plurality of gas-liquid nozzles are arranged on the base around the periphery of the MCR membrane component in a circumferential array manner; wherein the top of the protective cover is connected with an end cover, a mounting hole is formed in the end cover, and a liquid spraying disc is rotationally arranged in the mounting hole. By means of the MCR membrane assembly cleaning device, the whole MCR membrane assembly can be cleaned after being sealed, so that a large amount of cleaning liquid is prevented from splashing all around during cleaning, the cleaning liquid can be intensively discharged and treated, and the cleaning liquid is prevented from flowing all around to pollute the environment.

Description

Technical Field

[0001] The invention relates to an automatic MCR membrane cleaning device and method for treating printing and dyeing wastewater, belonging to the technical field of sewage treatment. Background Art

[0002] As a new type of membrane technology, MCR membrane components have a wide range of application value in the field of water treatment. However, during the use of MCR membrane components, the membrane pores are often blocked, which seriously affects the filtration performance of the membrane. Therefore, it is necessary to clean the MCR membrane components in the membrane pool regularly.

[0003] When cleaning the MCR membrane assembly, water flow is usually used to impact the membrane surface. During the flushing process, the cleaning liquid will splash everywhere, which is difficult to collect and easily causes environmental pollution. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an automatic MCR membrane cleaning device and method for treating printing and dyeing wastewater, which solves the problem of water splashing when flushing the MCR membrane assembly in the prior art.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical scheme: an automatic cleaning device for MCR membrane for printing and dyeing wastewater treatment, comprising a base for installing and fixing the MCR membrane assembly, the base being provided with guide tubes symmetrically diagonally; a shield arranged above the base, the shield being provided with guide rods symmetrically diagonally, the guide rods being slidably inserted in the guide tubes, the shield being lifted by a lifting device to cover the entire MCR membrane assembly inside; a plurality of gas-liquid nozzles being arranged on the base in a circular array around the outer circumference of the MCR membrane assembly; wherein an end cover is connected to the top of the shield, a mounting hole is provided on the end cover, a liquid spray disc is rotatably arranged in the mounting hole, and at least two hook rings are also provided on the end cover, the hook rings are used for cooperating with the lifting device.

[0006] By adopting the above technical solution, the entire MCR membrane assembly can be sealed and then cleaned, thereby preventing a large amount of cleaning liquid from splashing around during cleaning, and the cleaning liquid can be concentrated for discharge and treatment to prevent the cleaning liquid from spreading and polluting the environment. During cleaning, the entire MCR membrane assembly is sealed inside the protective cover. After the MCR membrane assembly is flushed, it can be further soaked. During the soaking process, air flow is continuously introduced into the inner cavity of the protective cover, which can keep the water flow in a flowing state, so that the cleaning liquid can effectively flush every stain on the MCR membrane assembly, thereby effectively dissolving and removing most of the stains on the MCR membrane assembly. A large amount of mixed gas and liquid is sprayed onto the MCR membrane assembly from top to bottom through the gas-liquid nozzle. The mist droplets formed by the mixed gas and liquid can cover the entire inner cavity of the protective cover, so that the contact between the MCR membrane assembly and the mixed gas and liquid is more sufficient, and the cleaning of the MCR membrane assembly is more uniform.

[0007] The present invention is further configured as follows: the mounting hole extends an upper plate and a lower plate toward the inner circle, a plurality of arc grooves are provided on the upper plate and the lower plate, a clamping groove is reserved between the upper plate and the inner plate, the liquid spray disc is rotatably arranged in the mounting hole through the clamping groove, a liquid supply pipe is rotatably connected to the liquid spray disc, an extension plate for clamping with the clamping groove is extended outward from the outer circle of the liquid spray disc, and a plurality of exhaust ports are arranged circumferentially on the extension plate.

[0008] By adopting the above technical solution, the cleaning liquid can be continuously introduced into the sealed inner cavity of the shield through the arrangement of the liquid spray disc to clean the MCR membrane assembly. The liquid spray disc is connected through the clamping groove formed between the upper plate and the lower plate, so that the liquid spray disc can rotate freely relative to the end cover, so that the cleaning liquid sprayed from the liquid spray disc can be sprayed more evenly on the MCR membrane assembly. The compressed gas sprayed by the gas-liquid nozzle can be used to drive the liquid spray disc to rotate, thereby improving the energy utilization rate. When the gas-liquid nozzle continuously introduces the mixed gas and liquid into the sealed shield, the liquid in the mixed gas and liquid adheres to the MCR membrane assembly, and the gas continues to increase, causing the internal pressure of the shield to increase continuously. When the pressure increases to a certain value, the gas in the shield enters the exhaust port on the extension plate through the arc groove set on the lower plate. Since the outlet above the exhaust port is blocked by the upper plate at this time, the continuously influx of airflow will push the entire liquid spray disc to rotate, so that the outlet above the exhaust port rotates to align with the arc groove on the upper plate, thereby releasing the airflow entering the exhaust port, and the exhaust port on the liquid spray disc continues to rotate to the next arc groove position under the action of inertia, so that the opening below the exhaust port is re-aligned with the arc groove opening on the lower plate, and the gas in the shield continues to flow into the exhaust port, and the relative position with the arc groove is continuously changed through the exhaust port, thereby realizing the utilization of the airflow in the inner cavity of the shield, and can blow the liquid spray disc to rotate when it sprays cleaning liquid.

[0009] The present invention is further configured as follows: a buffer cavity is arranged inside the guide rod, one end of the guide rod is open, and the other end is closed, a sealing sleeve is arranged on the outer ring of the open end of the guide rod, and a pressure relief hole is arranged on the closed end, the buffer cavity connects the open end of the guide rod with the pressure relief hole, when the guide rod is inserted into the guide tube, the gas in the guide tube flows into the buffer cavity from the opening of the guide rod, and is finally discharged through the pressure relief hole, and the aperture of the sealing sleeve is equal to that of the inner cavity of the guide tube.

[0010] By adopting the above technical solution, the gas in the guide tube is discharged through the pressure relief hole with a smaller aperture, which can slow down the descent speed of the shield, thereby ensuring the stability of the shield during installation.

[0011] The present invention is further configured as follows: a gas-liquid cavity is provided inside the base, the gas-liquid cavity includes a mixing circuit and a flow circuit that are interconnected, an air supply pipe and a water supply pipe are respectively connected to the mixing circuit, and the flow circuit is connected to the gas-liquid nozzle.

[0012] By adopting the above technical solution, compressed gas can be mixed with water flow, and the MCR membrane assembly can be flushed by the mixed gas and liquid, which can more effectively flush the stains on the MCR membrane assembly, making the cleaning of the MCR membrane assembly more thorough. At the same time, it can reduce the damage caused by the impact of high-pressure water flow on the MCR membrane assembly, avoiding damage to the membrane during the cleaning process.

[0013] The present invention is further configured as follows: a driver is provided on the end cover, and the driver is connected to the guide rod for driving the guide rod to rotate; an external thread is provided at one end of the guide rod close to the driver, and an internal thread is provided inside the opening section of the guide tube; the external thread on the guide rod and the internal thread on the guide tube at the bottom of the shield are meshed with each other and tightly fit onto the upper surface of the base.

[0014] By adopting the above technical solution, the shield can be effectively fixed on the base, so that the side of the bottom of the shield fits tightly with the base, preventing water from penetrating through the bottom during cleaning. When installing the shield, by inserting the guide tube into the guide tube, the shield can be effectively guided during the descent process to prevent deviation during the installation process. The entire guide rod is driven to rotate by the rotation of the motor, so that the external thread on the guide rod and the internal thread of the inner cavity of the guide tube engage and rotate with each other, and the entire shield can be fixed on the base to prevent deviation between the shield and the base.

[0015] The present invention is further configured as follows: a sealing ring is provided on the side edge of the bottom of the shield.

[0016] By adopting the above technical solution, the sealing ring can further improve the sealing effect, prevent the water from penetrating from the bottom side of the shield after a large amount of water flows into the shield, and make the cleaning process of the MCR membrane module safer. At the same time, the setting of the sealing ring can buffer the contact between the bottom side of the shield and the base when the thread is locked.

[0017] The present invention is further configured as follows: a rotating retaining ring is provided on one side of the extension plate that is in contact with the lower plate.

[0018] By adopting the above technical solution, friction between the liquid spray disc and the clamping groove can be avoided during rotation, which can not only improve the rotation efficiency of the entire liquid spray disc, but also reduce the loss of the liquid spray disc and increase the service life of the liquid spray disc.

[0019] The present invention is further configured as follows: a square outer convex edge and a square inner convex edge are provided on the base, a square card groove for clamping the bottom side of the shield is reserved between the square outer convex edge and the square inner convex edge, the square inner convex edge is hollow inside and connected to the flow circuit, and the gas-liquid nozzle is arranged on the square inner convex edge.

[0020] By adopting the above technical solution, the square card slot and the sealing ring cooperate with each other to achieve a tight seal. When installing the shield, the reserved square card slot allows the shield to be easily inserted and fixed on the base, avoiding loosening or falling off caused by improper installation. The card connection between the shield and the base makes disassembly more convenient, which is convenient for maintenance and replacement.

[0021] The present invention is further configured as follows: the side wall of the shield is made of a transparent material, and a drain pipe is connected to the shield.

[0022] The adoption of the above technical solution helps the staff to observe the cleaning status of the MCR membrane components in real time.

[0023] An automatic cleaning method for an MCR membrane for treating printing and dyeing wastewater comprises the following steps: S1. Fix the base on the ground, and use the lifting device to lift the MCR membrane assembly onto the base and fix it; S2. After the protective cover is lifted by the lifting device, the positioning of the protective cover is achieved by plugging the guide rod and the guide tube into each other, and the protective cover is controlled to descend until the side edge of the bottom of the protective cover is inserted into the square slot; S3, firstly, introduce clean water into the water supply pipe, and after the clean water fills the mixing circuit, introduce compressed gas into the mixing circuit through the air supply pipe, and the compressed gas mixes with water and enters the flow circuit, and finally sprays out through the gas-liquid nozzle. When the gas-liquid nozzle sprays the mixed gas and liquid outward, the cleaning liquid is sprayed onto the MCR membrane assembly through the liquid spraying disc; S4, by continuously spraying the cleaning liquid and the mixed gas-liquid onto the MCR membrane assembly sealed by the protective cover until the MCR membrane assembly is immersed, the MCR membrane assembly is soaked for a period of time, and during the soaking process, gas is continuously introduced into the inner cavity of the protective cover to keep the water flow in a moving state. After soaking for a period of time, the cleaning liquid is discharged through the drain pipe, and the process is repeated twice to remove the stains on the MCR membrane assembly; S5. After the cleaning liquid is drained, the mixed gas and liquid are sprayed into the protective cover again through the gas-liquid nozzle, and clean water is sprayed into the protective cover through the liquid spray disk to rinse the MCR membrane assembly with clean water. After rinsing, the MCR membrane assembly is reinstalled into the membrane pool to complete the cleaning steps of the entire MCR membrane assembly.

[0024] By adopting the above technical solution, a powerful gas-liquid mixed fluid is formed by mixing clean water and compressed gas, and sprayed out through the gas-liquid nozzle, which effectively improves the cleaning strength and cleaning efficiency. The continuous spraying of the cleaning liquid and the mixed gas-liquid ensures that the surface of the MCR membrane component is fully infiltrated and cleaned, and stains and sediments are effectively removed. The immersion treatment process allows the cleaning liquid to penetrate into every corner of the MCR membrane component, further removing stubborn stains that are difficult to clean.

[0025] The beneficial effects of the present invention are as follows: the entire MCR membrane assembly is sealed and cleaned by the protective cover, which can prevent the splashing of the cleaning liquid, so that the cleaning liquid after cleaning can be centrally processed to avoid the cleaning liquid from polluting the environment. At the same time, the entire MCR membrane assembly can be soaked during sealing, which can effectively remove the stains on the MCR membrane assembly and achieve a better cleaning effect.

[0026] The gas sprayed into the shield is used to drive the liquid spray disc to rotate, so that the liquid spray disc can rotate synchronously when spraying the cleaning liquid, thereby improving energy utilization and allowing the cleaning liquid to be sprayed more evenly onto the MCR membrane assembly.

[0027] The guide tube and the guide rod are arranged so that the shield can be accurately installed. The sealing ring arranged at the bottom of the shield and the square groove arranged on the base are mutually engaged, and a tight seal can be achieved by tightening the threads.

[0028] By setting the internal cavity of the guide rod, the shield can be lowered onto the base in a relatively gentle state during installation, thereby preventing the shield from descending too quickly and colliding violently with the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of the shield installation process of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the protective cover of the present invention after installation; Figure 3An exploded view of the present invention; Figure 4 A cross-sectional view of the internal passage of the base of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the liquid spraying disc of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the bottom of the liquid spraying disc of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the guide rod and the guide tube of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure when the base of the present invention is used in conjunction with the membrane pool; Fig. 9 It is a schematic diagram of the three-dimensional structure of the membrane pool of the present invention.

[0030] In the figure: 1. base; 101. gas-liquid cavity; 1011. mixing circuit; 1012. flow circuit; 102. square outer convex edge; 103. square inner convex edge; 104. square slot; 105. connecting pipe; 2. MCR membrane assembly; 3. guide tube; 301. internal thread; 4. shield; 5. guide rod; 501. external thread; 502. pressure relief hole; 503. sealing sleeve; 6. gas-liquid nozzle; 7. end cover; 701. upper plate; 702. lower plate; 703. arc groove; 8. liquid spray disc; 801. extension plate; 802. exhaust port; 803. liquid spray hole; 9. rotating retaining ring; 10. liquid supply pipe; 11. gas supply pipe; 12. water supply pipe; 13. driver; 14. sealing ring; 15. hook ring; 16. sewage tank; 17. membrane tank; 18. clean water tank. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0032] Embodiment 1: like Figure 1 As shown, an automatic cleaning device for MCR membrane for treating printing and dyeing wastewater comprises a base 1 for installing and fixing an MCR membrane assembly 2, wherein the base 1 is provided with guide tubes 3 symmetrically diagonally; a shield 4 is provided above the base 1, wherein the shield 4 is provided with guide rods 5 symmetrically diagonally, wherein the guide rods 5 are slidably inserted into the guide tubes 3, and the shield 4 covers the entire MCR membrane assembly 2 inside after being lifted by a lifting device; a plurality of gas-liquid nozzles 6 are provided on the base 1 in a circular array around the outer periphery of the MCR membrane assembly 2, wherein the water flow injection direction of the gas-liquid nozzles 6 is toward the top position of the MCR membrane assembly 2; wherein an end cover 7 is connected to the top of the shield 4, wherein a mounting hole is provided on the end cover 7, wherein a liquid spraying disc 8 is rotatably provided in the mounting hole, and three hook rings 15 are also provided on the end cover 7, wherein the hook rings 15 are used for cooperating with the lifting device.

[0033] When the device is in use, the protective cover 4 is lifted to a position higher than the height of the MCR membrane assembly 2 by the lifting device, wherein the three hooks 15 provided on the end cover 7 are used in conjunction with the lifting device. After the protective cover 4 is lifted by the lifting device, the lateral position of the protective cover 4 is positioned by aligning the guide rod 5 with the guide tube 3 and inserting it, and the protective cover 4 is continuously controlled to descend a certain height until the bottom side of the protective cover 4 abuts against the base 1. After the MCR membrane assembly 2 is sealed by the protective cover 4, the mixed gas-liquid and cleaning liquid are sprayed into the interior of the protective cover 4 by the gas-liquid nozzle 6 and the liquid spraying disc 8 respectively to clean the MCR membrane assembly 2.

[0034] During the cleaning process of the MCR membrane assembly 2, a mixed gas-liquid is sprayed out from the gas-liquid nozzle 6. The mixed gas-liquid is a mixture of clean water and compressed gas. By spraying and flushing the MCR membrane assembly 2 with the mixed gas-liquid, damage to the MCR membrane assembly 2 caused by direct impact of high-pressure water flow can be avoided. Cleaning liquid is sprayed out from the liquid spray disc 8, and the cleaning liquid is sprayed on the MCR membrane assembly 2 from top to bottom, which can effectively remove the stains on the MCR membrane assembly 2. When the water in the protective cover 4 reaches a certain height, the introduction of clean water is stopped, and compressed gas and cleaning liquid are continuously injected into the protective cover 4. After the compressed gas is sprayed into the water, bubbles are generated, thereby blowing the water flow in the protective cover 4, so that the cleaning liquid sprayed from the liquid spray disc 8 can be evenly mixed into the water body, so that the MCR membrane assembly 2 is fully in contact with the cleaning liquid, which greatly improves the cleaning effect of the MCR membrane assembly 2. At the same time, after the MCR membrane assembly 2 is submerged in the water surface in the protective cover 4, the MCR membrane assembly 2 can be soaked for a period of time, so as to better remove the stains on the MCR membrane assembly 2. During the soaking process, compressed gas can be continuously introduced into the shield 4 to cause water to flow, thereby continuously flushing the membrane in the MCR membrane assembly 2 and improving the cleaning effect.

[0035] Specifically, Figure 4 As shown, a gas-liquid chamber 101 is provided inside the base 1, and the mixed gas and liquid sprayed by the gas-liquid nozzle 6 is provided by the gas-liquid chamber 101. The gas-liquid chamber 101 includes a mixing circuit 1011 and a flow circuit 1012 that are interconnected. The mixing circuit 1011 and the flow circuit 1012 are both square. The flow circuit 1012 is arranged in the inner circle of the mixing circuit 1011. The mixing circuit 1011 is respectively connected with an air supply pipe 11 and a water supply pipe 12, and the air supply pipe 11 and the water supply pipe 12 are symmetrically arranged at the two side positions of the mixing circuit 1011. The mixing circuit 1011 and the flow circuit 1012 are connected through a connecting pipe 105. There are two connecting pipes 105, which are symmetrically arranged at the other two side positions.

[0036] When spraying the mixed gas and liquid, clean water is first introduced into the mixing circuit 1011. When clean water flows out of the gas-liquid nozzle 6, the gas supply pipe 11 is opened to introduce compressed gas into the mixing circuit 1011. The compressed gas enters the mixing circuit 1011 filled with clean water, and after mixing with the clean water, enters the flow circuit 1012 through the connecting pipe 105, and finally sprays out through the gas-liquid nozzle 6. Flushing the MCR membrane assembly 2 with the mixed gas and liquid can more effectively flush the stains on the MCR membrane assembly 2, making the cleaning of the MCR membrane assembly 2 more thorough, and at the same time can reduce the damage caused by the impact of the high-pressure water flow on the MCR membrane assembly 2, avoiding damage to the membrane during the cleaning process.

[0037] In this embodiment, a drain pipe is also provided on the shield 4. After the MCR membrane assembly 2 is cleaned and soaked, the water in the shield 4 is discharged through the drain pipe to prevent the water after cleaning the MCR membrane assembly 2 from polluting the environment. After the MCR membrane assembly 2 is cleaned with the cleaning liquid, it is necessary to repeat the clean water rinse for two to three times to flush the cleaning liquid on the MCR membrane assembly 2.

[0038] Further, such as Figure 3 As shown, the mounting hole extends to the inner circle to form an upper plate 701 and a lower plate 702, and a plurality of arc grooves 703 are provided on the upper plate 701 and the lower plate 702. A clamping groove is reserved between the upper plate 701 and the inner plate. The liquid spraying disc 8 is rotatably arranged in the mounting hole through the clamping groove. A liquid supply pipe 10 is rotatably connected to the liquid spraying disc 8. The other end of the liquid supply pipe 10 is connected to an external pressure pump, and the cleaning liquid is pressed into the liquid spraying disc 8 through the pressure pump. An extension plate 801 for clamping with the clamping groove is extended outward from the outer circle of the liquid spraying disc 8, and four exhaust ports 802 are arranged on the circumference of the extension plate 801.

[0039] Specifically, the number of arc-shaped grooves 703 provided on the upper plate 701 and the lower plate 702 is four, which are arranged in an array with equal spacing around the circumference, and the arc-shaped grooves 703 on the upper plate 701 and the lower plate 702 are provided at the same position. Figure 5 As shown, there are four exhaust ports 802 on the extension plate 801, which are arranged in an array with equal distances around the circumference. The four exhaust ports 802 are arranged in a wave-shaped manner on the extension plate 801, that is, the four exhaust ports 802 are spliced ​​end to end. Among them, when the upper end opening of the exhaust port 802 is directly opposite to the arc groove 703 provided on the upper plate 701, the lower end opening of the exhaust port 802 is closed by the lower plate 702. If the upper end opening of the exhaust port 802 is closed by the upper plate 701, the lower end opening of the exhaust port 802 is directly opposite to the position of the arc groove 703 provided on the lower plate 702. Therefore, the airflow entering the exhaust port 802 through the arc groove 703 on the lower plate 702 needs to push the liquid spray disc 8 to rotate, so that the liquid spray disc 8 can be discharged only after the upper end opening of the exhaust port 802 is rotated to face the arc groove 703 provided on the upper plate 701.

[0040] Further, such as Figure 6 As shown, a plurality of liquid spray holes 803 with equal apertures are arranged at the bottom of the liquid spray disk 8.

[0041] During the cleaning process of the MCR membrane assembly 2, when the water in the protective cover 4 accumulates to a certain liquid level, compressed gas is continuously introduced into the protective cover 4, the water supply pipe 12 is closed, and the introduction of clean water is stopped. After the compressed gas is introduced into the protective cover 4, bubbles are generated in the water and float up, causing the water in the protective cover 4 to flow, thereby promoting the cleaning of the MCR membrane assembly 2.

[0042] After the compressed gas passes through the water surface, the continuously introduced gas causes the internal pressure of the shield 4 to increase, and the formed compressed gas enters the exhaust port 802 through the arc groove 703 on the lower plate 702, and flows upward along the exhaust port 802. The airflow continuously entering the exhaust port 802 drives the entire liquid spraying disc 8 to rotate, so that the airflow entering the exhaust port 802 is smoothly discharged, and the rotation of the entire liquid spraying disc 8 is driven. During the rotation of the liquid spraying disc 8, the upper and lower openings of the exhaust port 802 are continuously overlapped and separated with the arc groove 703 on the upper plate 701 and the arc groove 703 on the lower plate 702, respectively, to realize the entire exhaust cycle.

[0043] In this embodiment, a rotating retaining ring 9 is provided on one side where the extension plate 801 and the lower plate 702 are attached. The rotating retaining ring 9 is specifically a thrust bearing, which can effectively reduce the sliding friction generated by the liquid spraying disc 8 when rotating. Specifically, one side of the rotating retaining ring 9 is fixed on the extension plate 801, and the other side is clamped on the lower plate 702, so that the lower bottom surface of the extension plate 801 and the lower plate 702 are spaced apart to avoid contact between the extension plate 801 and the lower plate 702. When the liquid spraying disc 8 rotates, no sliding friction will be generated between the extension plate 801 and the lower plate 702, which can effectively improve the service life of the liquid spraying disc 8 and the end cover 7, and at the same time reduce energy loss, so that most of the energy of the compressed gas is used to drive the liquid spraying disc 8 to rotate.

[0044] In this embodiment, if Figure 7 As shown, a buffer cavity is arranged inside the guide rod 5, one end of the guide rod 5 is open, and a cone is recessed in the open end toward the inside of the buffer cavity, the center of the cone is an opening, the size of the opening is smaller than one-third of the outer diameter of the guide rod 5, and the other end is closed. A sealing sleeve 503 is arranged on the outer ring fixed sleeve of the open end of the guide rod 5, and a pressure relief hole 502 is arranged on the closed end. The buffer cavity connects the open end of the guide rod 5 with the pressure relief hole 502. When the guide rod 5 is inserted into the guide tube 3, the gas in the guide tube 3 flows into the buffer cavity from the opening of the guide rod 5, and is finally discharged through the pressure relief hole 502. The aperture of the sealing sleeve 503 is equal to that of the inner cavity of the guide tube 3.

[0045] During the installation of the shield 4, the guide rod 5 is slidably inserted into the guide tube 3. When the guide rod 5 slides downward, the sealing sleeve 503 compresses the gas in the guide tube 3, so that the gas in the guide tube 3 enters the buffer cavity through the central opening of the cone, and is discharged from the pressure relief hole 502 after passing through the buffer cavity. By reducing the gas passage aperture and discharge aperture, the shield 4 can be smoothly lowered during the installation process, without the need to control the lowering speed through the lifting device, thereby ensuring the stability of the installation of the entire shield 4 and the safety of the operation.

[0046] Further, such as Figure 3 As shown, a driver 13 is provided on the end cover 7, and the driver 13 is connected to the guide rod 5 for driving the guide rod 5 to rotate. An external thread 501 is provided at one end of the guide rod 5 close to the driver 13, and an internal thread 301 is provided inside the opening section of the guide tube 3. The external thread 501 on the guide rod 5 at the bottom of the shield 4 is meshed with the internal thread 301 on the guide tube 3 and fits tightly on the upper surface of the base 1.

[0047] The shield 4 is gently lowered until the external thread 501 on the guide rod 5 contacts the guide tube 3, and then the guide rod 5 is driven to rotate by the driver 13, so that the guide rod 5 continues to move downward along the axis until the bottom of the shield 4 contacts the base 1. The length of the guide rod 5 is less than the cavity depth of the guide tube 3, so the bottom side of the shield 4 can contact the base 1 smoothly. Through the threaded engagement, the shield 4 can be firmly fixed on the base 1, preventing the contact gap between the bottom side of the shield 4 and the base 1, and greatly improving the airtightness of the entire shield 4.

[0048] Furthermore, a square outer convex edge 102 and a square inner convex edge 103 are provided on the base 1, and a square slot 104 for clamping the bottom side of the protective cover 4 is reserved between the square outer convex edge 102 and the square inner convex edge 103. The slot width of the square slot 104 is greater than the side wall thickness of the protective cover 4. The square inner convex edge 103 is hollow inside and connected to the flow circuit 1012. The gas-liquid nozzle 6 is arranged on the square inner convex edge 103, and a sealing ring 14 is arranged on the bottom side of the protective cover 4. The sealing ring 14 can further improve the sealing effect to prevent the water from seeping out from the bottom side of the protective cover 4 after a large amount of water flows into the protective cover 4.

[0049] In this embodiment, the width of the sealing ring 14 is greater than the groove width of the square groove 104 and it is elastic. When the sealing ring 14 contacts the square groove 104, due to its own elasticity, the sealing ring 14 will be squeezed into the square groove 104 as the shield 4 continues to descend. Since the width of the sealing ring 14 is greater than the groove width of the square groove, the sealing ring 14 can completely fill the entire square groove. By setting the size of the sealing ring 14, the sealing performance between the entire shield 4 and the base 1 is increased, and the possibility of water penetration is reduced.

[0050] The side of the shield 4 is made of transparent material to help the staff observe the cleaning status of the MCR membrane assembly 2 in real time.

[0051] Based on the above automatic cleaning device, the present invention also relates to an automatic cleaning method for MCR membrane for printing and dyeing wastewater treatment, which specifically includes the following operating steps: S1, fix the base 1 on the ground, and hoist the MCR membrane assembly 2 onto the base 1 by a lifting device and fix it; S2, after the protective cover 4 is lifted by the lifting device, the protective cover 4 is positioned by plugging the guide rod 5 and the guide tube 3 into each other, and the protective cover 4 is controlled to descend until the side edge of the bottom of the protective cover 4 is inserted into the square slot 104; S3, firstly, clean water is introduced into the water supply pipe 12, and after the clean water fills the mixing circuit 1011, compressed gas is introduced into the mixing circuit 1011 through the air supply pipe 11, and the compressed gas is mixed with water and enters the flow circuit 1012, and finally sprayed out through the gas-liquid nozzle 6. When the gas-liquid nozzle 6 sprays the mixed gas and liquid outward, the cleaning liquid is sprayed onto the MCR membrane assembly 2 through the liquid spraying disk 8; S4, by continuously spraying the cleaning liquid and the mixed gas-liquid onto the MCR membrane assembly 2 sealed by the protective cover 4 until the MCR membrane assembly 2 is immersed, the MCR membrane assembly 2 is immersed for a period of time, and during the immersion process, gas is continuously introduced into the inner cavity of the protective cover 4 to disturb the water body. After immersion for a period of time, the cleaning liquid is discharged through the drain pipe, and the process is repeated twice to remove the stains on the MCR membrane assembly 2; S5. After the cleaning liquid is drained, the mixed gas and liquid are sprayed into the protective cover 4 again through the gas-liquid nozzle 6, and clean water is sprayed into the protective cover 4 through the liquid spray disk 8 to rinse the MCR membrane assembly 2 with clean water. After rinsing, the MCR membrane assembly 2 is reinstalled into the membrane pool 17 to complete the cleaning step of the entire MCR membrane assembly 2.

[0052] Embodiment 2: like Figure 8 and Fig. 9 As shown, the entire automatic cleaning device is installed in the membrane pool 17 for use. By arranging the cleaning device in the membrane pool 17, the MCR membrane assembly 2 can be cleaned without completely draining the water in the membrane pool 17.

[0053] Specifically, the two sides of the membrane pool 17 are a sewage pool 16 and a clean water pool 18 respectively. The water in the sewage pool 16 enters the membrane pool 17 after preliminary filtration through the filter plate, and is further processed by the MCR membrane assembly 2 before entering the clean water pool 18.

[0054] In this embodiment, six bases 1 are evenly spaced in the membrane pool 17, and the MCR membrane assembly 2 is fixed in the middle of the base 1, wherein the internal thread 301 arranged in the inner cavity of the guide tube 3 is greater than two-thirds of the total length of the guide tube 3, and the external thread 501 arranged on the guide rod 5 is two-thirds of the total length of the guide rod 5, and the length of the guide rod 5 is greater than the depth of the guide tube 3. During the operation of the membrane pool 17, when the MCR membrane assembly 2 needs to be cleaned, the shield 4 is lifted to the top of one of the MCR membrane assemblies 2 by the lifting device, and the entire shield 4 is first positioned by inserting the guide rod 5 into the guide tube 3, and the guide rod 5 is driven to rotate by the driver 13, so that the shield 4 is lowered into the membrane pool 17 in a threaded feeding manner. During the descent of the shield 4, the water in the area of ​​the MCR membrane assembly 2 is first covered inside, and a cavity is formed between the water and the shield 4. During the continuous descent of the shield 4, the air in the cavity is compressed and finally discharged through the exhaust port 802 on the liquid spraying disc 8, and the external water is continuously pressed into the shield 4 to replace the discharged air. When the shield 4 is completely in contact with the base 1 and sealed, the water inside the shield 4 is discharged into the membrane pool 17 through the drain pipe. After the water in the protective cover 4 is completely drained, the mixed gas-liquid and the cleaning liquid are respectively introduced into the protective cover 4 through the gas-liquid nozzle 6 and the liquid spraying disk 8, and the cleaning method in the first embodiment is repeated until the MCR membrane assembly 2 is completely cleaned.

[0055] The protective cover 4 cooperates with the base 1 to seal the MCR membrane assembly 2, thereby achieving online cleaning of a single MCR membrane assembly 2 without interfering with the normal operation of other MCR membrane assemblies 2. The MCR membrane assembly 2 can be cleaned without completely draining the water to be treated in the entire membrane pool 17, thereby improving the working efficiency of the entire MCR membrane assembly 2.

[0056] Working principle: The cleaning of the MCR membrane assembly 2 is divided into three processes: flushing, soaking and rinsing. First, after the MCR membrane assembly 2 is sealed by the protective cover 4, the MCR membrane assembly 2 is flushed. During the flushing process, the gas-liquid nozzle 6 sprays the mixed gas and liquid onto the MCR membrane assembly 2 to preliminarily flush the stains on the outside of the MCR membrane assembly 2. At the same time, the cleaning liquid is sprayed onto the MCR membrane assembly 2 through the liquid spray disc 8. During the spraying process, the continuously introduced compressed gas is discharged through the exhaust port 802 on the liquid spray disc 8 and drives the liquid spray disc 8 to rotate at the same time, so that the cleaning liquid sprayed by the liquid spray disc 8 can fall more evenly on the MCR membrane assembly 2, ensuring that the cleaning of the MCR membrane assembly 2 is more thorough. When the water in the protective cover 4 accumulates to a certain height, so that the water level submerges the gas-liquid nozzle 6, the mixed gas and liquid sprayed from the gas-liquid nozzle 6 is blocked by the water body and no longer sprayed onto the MCR membrane assembly 2 to flush the MCR membrane assembly 2, and the flushing is converted to soaking. During the soaking process, the mixed gas-liquid and cleaning liquid are continuously introduced until the water level in the protective cover 4 is higher than the MCR membrane assembly 2. At this time, the introduction of clean water and cleaning liquid is stopped, and compressed gas is continuously introduced. The compressed gas stirs the water flow in the protective cover 4, so that the cleaning liquid can be evenly distributed in the entire water body, thereby improving the cleaning effect of the MCR membrane assembly 2. After soaking for a certain period of time, the water in the protective cover 4 is completely drained through the drain pipe, and clean water is introduced into the protective cover 4 again to rinse the entire MCR membrane assembly 2. After repeating the rinsing for more than two times, the cleaning of the entire MCR membrane assembly 2 is completed.

[0057] For the liquid spraying disc 8, in the mixed gas and liquid sprayed by the gas-liquid nozzle 6, most of the liquid adheres to the MCR membrane assembly 2, and the gas enters the exhaust port 802 through the arc groove 703 of the lower plate 702, flows upward through the exhaust port 802, and is discharged from the arc groove 703 of the upper plate 701. In the initial state of the liquid spraying disc 8, the bottom opening of the exhaust port 802 on the extension plate 801 is directly opposite to the arc groove 703 of the lower plate 702. At this time, the inner cavity of the shield 4 is connected with the exhaust port 802 through the arc groove 703 of the lower plate 702, and the upper part of the exhaust port 802 is just separated from the arc groove 703 of the upper plate 701. When the gas inside the protective cover 4 is continuously squeezed into the exhaust port 802 through the arc groove 703 of the lower plate 702, it will push the liquid spray disc 8 to rotate, so that the upper opening of the exhaust port 802 rotates to overlap with the arc groove 703 of the upper plate 701, so that the gas in the exhaust port 802 can be discharged through the arc groove 703 of the upper plate 701, and at the same time, the liquid spray disc 8 continues to rotate, and after rotating to the initial position again, the above exhaust cycle is repeated, so that the gas can rotate.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic MCR membrane cleaning device for printing and dyeing wastewater treatment, characterized in that: It comprises a base (1) for mounting and fixing an MCR membrane assembly (2), wherein the base (1) is provided with guide tubes (3) in a diagonally symmetrical manner; A shield (4) is arranged above the base (1), and guide rods (5) are symmetrically arranged diagonally on the shield (4). The guide rods (5) are slidably inserted into the guide tube (3). The shield (4) is lifted by a lifting device to cover the entire MCR membrane assembly (2) inside. A plurality of gas-liquid nozzles (6) are arranged on the base (1) in an array around the outer circumference of the MCR membrane assembly (2); The top of the shield (4) is connected to an end cover (7), a mounting hole is provided on the end cover (7), a liquid spray disc (8) is rotatably arranged in the mounting hole, and at least two hook rings (15) are also provided on the end cover (7), and the hook rings (15) are used for cooperating with the lifting device.

2. The MCR membrane automatic cleaning device for dyeing wastewater treatment according to claim 1 is characterized in that: The mounting hole extends toward the inner circle to form an upper plate (701) and a lower plate (702); a plurality of arc-shaped grooves (703) are provided on the upper plate (701) and the lower plate (702); a clamping groove is reserved between the upper plate (701) and the inner plate; the liquid spray disc (8) is rotatably arranged in the mounting hole through the clamping groove; a liquid supply pipe (10) is rotatably connected to the liquid spray disc (8); an extension plate (801) for clamping with the clamping groove is extended outward from the outer circle of the liquid spray disc (8); a plurality of exhaust ports (802) are arranged on the circumference of the extension plate (801); the number of the exhaust ports (802) is equal to the number of the arc-shaped grooves (703).

3. The MCR membrane automatic cleaning device for dyeing wastewater treatment according to claim 1 is characterized in that: A buffer cavity is provided inside the guide rod (5); one end of the guide rod (5) is open and the other end is closed; a sealing sleeve (503) is provided on the outer ring of the open end of the guide rod (5); a pressure relief hole (502) is provided on the closed end; the buffer cavity connects the open end of the guide rod (5) with the pressure relief hole (502); when the guide rod (5) is inserted into the guide tube (3), the gas in the guide tube (3) flows into the buffer cavity from the opening of the guide rod (5) and is finally discharged through the pressure relief hole (502); the aperture of the sealing sleeve (503) is equal to that of the inner cavity of the guide tube (3).

4. The MCR membrane automatic cleaning device for treating printing and dyeing wastewater according to claim 1 is characterized in that: The base (1) is provided with a gas-liquid cavity (101) inside, the gas-liquid cavity (101) comprising a mixing circuit (1011) and a flow circuit (1012) which are interconnected, the mixing circuit (1011) being respectively connected to an air supply pipe (11) and a water supply pipe (12), and the flow circuit (1012) being connected to the gas-liquid nozzle (6).

5. The MCR membrane automatic cleaning device for treating printing and dyeing wastewater according to claim 1, characterized in that: The end cover (7) is provided with a driver (13), the driver (13) being connected to the guide rod (5) and being used for driving the guide rod (5) to rotate; an end of the guide rod (5) close to the driver (13) is provided with an external thread (501), an opening section of the guide tube (3) is provided with an internal thread (301), and the external thread (501) on the guide rod (5) and the internal thread (301) on the guide tube (3) at the bottom of the shield (4) are meshed with each other and tightly attached to the upper surface of the base (1).

6. The MCR membrane automatic cleaning device for treating printing and dyeing wastewater according to claim 5, characterized in that: A sealing ring (14) is provided on the bottom side of the protective cover (4).

7. The MCR membrane automatic cleaning device for treating printing and dyeing wastewater according to claim 2, characterized in that: A rotating retaining ring (9) is provided on one side of the extension plate (801) that is in contact with the lower plate (702).

8. The MCR membrane automatic cleaning device for treating printing and dyeing wastewater according to claim 4, characterized in that: The base (1) is provided with a square outer convex edge (102) and a square inner convex edge (103), a square slot (104) for clamping the bottom side of the shield (4) is reserved between the square outer convex edge (102) and the square inner convex edge (103), the square inner convex edge (103) is hollow inside and is connected to the flow circuit (1012), and the gas-liquid nozzle (6) is arranged on the square inner convex edge (103).

9. The MCR membrane automatic cleaning device for treating printing and dyeing wastewater according to claim 1, characterized in that: The side wall of the protective cover (4) is made of a transparent material, and a drainage pipe is connected to the protective cover (4).

10. An automatic cleaning method for MCR membrane used in the treatment of printing and dyeing wastewater, specifically applied to an automatic cleaning device for MCR membrane used in the treatment of printing and dyeing wastewater as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Fixing the base (1) on the ground, and hoisting the MCR membrane assembly (2) onto the base (1) by means of a lifting device and fixing it; S2, after the protective cover (4) is lifted by the lifting device, the protective cover (4) is positioned by plugging the guide rod (5) and the guide tube (3) into each other, and the protective cover (4) is controlled to descend until the side edge of the bottom of the protective cover (4) is inserted into the square slot (104); S3, firstly, clean water is introduced into the water supply pipe (12), and after the clean water fills the mixing circuit (1011), compressed gas is introduced into the mixing circuit (1011) through the air supply pipe (11), and the compressed gas is mixed with water and enters the flow circuit (1012), and finally sprayed out through the gas-liquid nozzle (6), and when the gas-liquid nozzle (6) sprays the mixed gas and liquid outward, the cleaning liquid is sprayed onto the MCR membrane assembly (2) through the liquid spraying disk (8); S4, continuously spraying the cleaning liquid and the mixed gas-liquid onto the MCR membrane assembly (2) sealed by the protective cover (4) until the MCR membrane assembly (2) is immersed, and soaking the MCR membrane assembly (2) for a period of time. During the soaking process, gas is continuously introduced into the inner cavity of the protective cover (4) so ​​that the water in the protective cover (4) is in a moving state. After soaking for a period of time, the cleaning liquid is discharged through the drain pipe. This is repeated twice to remove the stains on the MCR membrane assembly (2); S5. After the cleaning liquid is completely drained, the mixed gas and liquid are sprayed into the protective cover (4) again through the gas-liquid nozzle (6), and clean water is sprayed into the protective cover (4) through the liquid spray disc (8) to rinse the MCR membrane assembly (2) with clean water. After rinsing, the MCR membrane assembly (2) is reinstalled into the membrane pool (17), completing the cleaning step of the entire MCR membrane assembly (2).

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