An MCR membrane automatic cleaning device and method for treating printing and dyeing wastewater

Abstract

The present invention discloses an automatic cleaning device and method for an MCR membrane used in dyeing wastewater treatment, belonging to the technical field of sewage treatment. The cleaning device includes a base for installing and fixing the MCR membrane module, and guide pipes are symmetrically arranged at the diagonals of the base; a protective cover is arranged above the base, and guide rods are symmetrically arranged at the diagonals of the protective cover. The guide rods are slidably inserted into the guide pipes, and after the protective cover is lifted by a hoisting device, the entire MCR membrane module is covered inside; a plurality of gas-liquid spray nozzles are arranged on the base in a circumferential array around the periphery of the MCR membrane module; wherein, an end cover is connected to the top of the protective cover, and an installation hole is opened on the end cover, and a liquid spraying disc is rotatably arranged in the installation hole. Through the present invention, the entire MCR membrane module can be sealed for cleaning, thereby preventing a large amount of cleaning liquid from splashing everywhere during cleaning, and the cleaning liquid can be centrally discharged and treated to prevent the cleaning liquid from flowing around and polluting the environment.

Description

Technical Field

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

[0002] As a new membrane technology, the MCR membrane module has wide application value in the field of water treatment. However, during the use of the MCR membrane module, the problem of membrane pore blockage often occurs, seriously affecting the filtration performance of the membrane. Therefore, it is necessary to regularly clean the MCR membrane module in the membrane tank.

[0003] When cleaning the MCR membrane module, water flow is usually used to impact the membrane surface. During the flushing process, the cleaning liquid will splash everywhere, making it difficult to collect centrally and easily causing environmental pollution. Summary of the Invention

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

[0005] The technical problem to be solved by the present invention is achieved by the following technical solutions: an automatic cleaning device for an MCR membrane used in dyeing and printing wastewater treatment, including a base for installing and fixing the MCR membrane module, and guide pipes symmetrically arranged diagonally on the base; a protective cover arranged above the base, and guide rods symmetrically arranged diagonally on the protective cover, the guide rods are slidably inserted into the guide pipes, and the entire MCR membrane module is covered inside after the protective cover is lifted by a lifting device; a plurality of gas-liquid spray nozzles arranged in a circumferential array around the periphery of the MCR membrane module on the base; wherein, the top of the protective cover is connected with an end cover, an installation hole is opened on the end cover, a liquid spraying disc is rotatably arranged in the installation hole, and at least two hook rings are also arranged on the end cover, and the hook rings are used to cooperate 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 lower 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 such that: a buffer chamber is provided inside the guide rod. One end of the guide rod is open and the other end is closed. A sealing sleeve is sleeved outside the open end of the guide rod, and a pressure relief hole is provided at the closed end. The buffer chamber communicates 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 chamber from the open end of the guide rod and finally discharges through the pressure relief hole. The aperture of the sealing sleeve is equal to the inner diameter of the guide tube lumen.

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

[0011] The present invention is further configured such that: a gas-liquid chamber is provided inside the base. The gas-liquid chamber includes a mixing circuit and a flow circuit that communicate with each other. An air supply pipe and a water supply pipe are respectively connected to the mixing circuit, and the flow circuit communicates with the gas-liquid spray head.

[0012] By adopting the above technical solution, compressed gas and water flow can be mixed, and the MCR membrane module can be rinsed with the mixed gas-liquid, which can more effectively wash away the stains on the MCR membrane module, making the cleaning of the MCR membrane module more thorough. At the same time, it can reduce the damage caused by the impact of high-pressure water flow on the MCR membrane module and avoid damaging the membrane sheets during the cleaning process.

[0013] The present invention is further configured such that: a driver is provided on the end cover. The driver is connected to the guide rod and is used to drive 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. After the external thread on the guide rod and the internal thread on the guide tube at the bottom of the protective cover are engaged with each other, the bottom of the protective cover closely fits on the upper surface of the base.

[0014] By adopting the above technical solution, the protective cover can be effectively fixed on the base, so that the side edge of the bottom of the protective cover closely fits the base, preventing water flow from penetrating through the bottom during cleaning. When installing the protective cover, by inserting the guide rod into the guide tube, the protective cover can be effectively guided during the descending process, preventing deviation during the installation process. By driving the entire guide rod to rotate through the motor, the external thread on the guide rod and the internal thread inside the guide tube lumen are engaged and rotated with each other, which can fix the entire protective cover on the base and prevent deviation between the protective cover and the base.

[0015] The present invention is further configured such that: a sealing ring is provided on the side edge of the bottom of the protective cover.

[0016] By adopting the above technical solutions, the sealing ring can further improve the sealing effect, prevent water from seeping out from the side of the bottom of the shield after a large amount of water flows into the interior of the shield, and make the cleaning process of the MCR membrane module safer. At the same time, with the setting of the sealing ring, when locked by threads, the contact between the side of the bottom of the shield and the base can be buffered.

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

[0018] By adopting the above technical solutions, it is possible to avoid friction between the liquid spraying disc and the clamping groove during rotation, which can not only improve the rotation efficiency of the entire liquid spraying disc, but also reduce the loss of the liquid spraying disc and improve the service life of the liquid spraying disc.

[0019] The present invention is further configured as: a square outer convex edge and a square inner convex edge are provided on the base, a square clamping groove for clamping the side of the bottom of the shield is reserved between the square outer convex edge and the square inner convex edge, the interior of the square inner convex edge is hollow and communicated with the flow circuit, and the gas-liquid spray head is arranged on the square inner convex edge.

[0020] By adopting the above technical solutions, the square clamping groove and the sealing ring cooperate with each other to achieve tight sealing. During the installation of the shield, the reserved square clamping groove enables the shield to be easily snapped into and fixed on the base, avoiding problems such as loosening or falling off caused by improper installation. The clamping method between the shield and the base also makes disassembly more convenient, facilitating maintenance and replacement.

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

[0022] By adopting the above technical solutions, it helps the staff to observe the cleaning situation of the MCR membrane module in real time.

[0023] An automatic cleaning method for an MCR membrane used in dyeing wastewater treatment includes the following steps:

[0024] S1. Fix the base on the ground, and hoist the MCR membrane module onto the base and fix it through a hoisting device;

[0025] S2. After hoisting the shield by a hoisting device, insert the guide rod and the guide tube into each other to position the shield, and control the shield to descend until the side of the bottom of the shield is snapped into the square clamping groove;

[0026] S3. First, introduce clean water into the water supply pipe. After the clean water fills the mixing circuit, introduce compressed gas into the mixing circuit through the gas supply pipe. After the compressed gas is mixed with water, it enters the flow circuit and is finally ejected through the gas-liquid nozzle. When the mixed gas-liquid is ejected outward from the gas-liquid nozzle, spray the cleaning liquid onto the MCR membrane module through the liquid spraying disc.

[0027] S4. Continuously spray the cleaning liquid and the mixed gas-liquid onto the MCR membrane module sealed by the shield until the MCR membrane module is submerged, and perform an immersion treatment on the MCR membrane module for a period of time. During the immersion process, continuously introduce gas into the inner cavity of the shield to keep the water flow in a moving state. After soaking for a period of time, drain the cleaning liquid through the drain pipe and repeat twice to remove the stains on the MCR membrane module.

[0028] S5. After the cleaning liquid is drained completely, spray the mixed gas-liquid into the shield again through the gas-liquid nozzle, and at the same time spray clean water into the shield through the liquid spraying disc to rinse the MCR membrane module with clean water. After rinsing, reinstall the MCR membrane module into the membrane pool to complete the cleaning step of the entire MCR membrane module.

[0029] By adopting the above technical solution, by mixing clean water and compressed gas to form a powerful gas-liquid mixed fluid and ejecting it through the gas-liquid nozzle, the cleaning strength and cleaning efficiency are effectively improved. The continuous spraying of the cleaning liquid and the mixed gas-liquid ensures that the surface of the MCR membrane module is fully wetted and cleaned, effectively removing stains and deposits. The immersion treatment process enables the cleaning liquid to penetrate into every corner of the MCR membrane module, further removing stubborn stains that are difficult to clean.

[0030] The beneficial effects of the present invention are as follows: By sealing and cleaning the entire MCR membrane module through the shield, it is possible to prevent the splashing of the cleaning liquid, enabling the concentrated treatment of the cleaning liquid after cleaning and avoiding environmental pollution caused by the cleaning liquid. At the same time, during sealing, the entire MCR membrane module can be immersed, effectively removing the stains on the MCR membrane module and achieving a better cleaning effect.

[0031] By using the gas sprayed into the shield to drive the rotation of the liquid spraying disc, the liquid spraying disc can rotate synchronously when spraying the cleaning liquid, improving the energy utilization rate and making the cleaning liquid more evenly sprayed onto the MCR membrane module.

[0032] Through the setting of the guide pipe and the guide rod, the shield can be accurately installed. The sealing ring provided at the bottom of the shield is engaged with the square card slot provided on the base, and a tight seal can be achieved by cooperating with the way of screwing.

[0033] Through the setting of the inner cavity of the guide rod, when the shield is installed, it can descend onto the base in a relatively gentle state, preventing the shield from descending too fast and colliding violently with the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 FIG. is a three - dimensional structural schematic diagram of the installation process of the shield of the present invention;

[0035] Figure 2 FIG. is a three - dimensional structural schematic diagram after the shield of the present invention is installed;

[0036] Figure 3 FIG. is an exploded view of the present invention;

[0037] Figure 4 FIG. is a cross - sectional view of the internal channel of the base of the present invention;

[0038] Figure 5 FIG. is a three - dimensional structural schematic diagram of the liquid - spraying disc of the present invention;

[0039] Figure 6 FIG. is a three - dimensional structural schematic diagram of the bottom of the liquid - spraying disc of the present invention;

[0040] Figure 7 FIG. is a three - dimensional structural schematic diagram of the guide rod and the guide tube of the present invention;

[0041] Figure 8 FIG. is a three - dimensional structural schematic diagram when the base of the present invention is used in cooperation with the membrane cell;

[0042] Figure 9 FIG. is a three - dimensional structural schematic diagram of the membrane cell of the present invention.

[0043] 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 card slot; 105. Connecting pipe; 2. MCR membrane module; 3. Guide tube; 301. Internal thread; 4. Shield; 5. Guide rod; 501. External thread; 502. Pressure - relief hole; 503. Sealing sleeve; 6. Gas - liquid spray head; 7. End cover; 701. Upper plate; 702. Lower plate; 703. Arc - shaped groove; 8. Liquid - spraying disc; 801. Extension plate; 802. Exhaust port; 803. Liquid - spraying 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 cell; 18. Clear water tank. DETAILED DESCRIPTION OF THE INVENTION

[0044] In order to make the technical means, creative features, achieving purposes and functions of the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0045] Example 1:

[0046] As shown in Figure 1As shown in the figure, an automatic cleaning device for MCR membranes used in printing and dyeing wastewater treatment includes a base 1 for installing and fixing the MCR membrane module 2. Diagonal symmetrically arranged guide pipes 3 are provided on the base 1; a shield 4 is arranged above the base 1. Diagonal symmetrically arranged guide rods 5 are provided on the shield 4. The guide rods 5 are slidably inserted into the guide pipes 3. After the shield 4 is lifted by a lifting device, the entire MCR membrane module 2 is covered inside; a number of gas-liquid spray nozzles 6 are arranged on the base 1 in a circumferential array around the periphery of the MCR membrane module 2. The water flow spraying direction of the gas-liquid spray nozzles 6 is towards the top position of the MCR membrane module 2; among them, a end cover 7 is connected to the top of the shield 4. An installation hole is opened on the end cover 7. A liquid spraying disc 8 is rotatably arranged in the installation hole. Three hook rings 15 are also arranged on the end cover 7. The hook rings 15 are used in cooperation with the lifting device.

[0047] When the device is in use, the shield 4 is lifted by a lifting device to a position higher than the height of the MCR membrane module 2. Among them, the three hook rings 15 arranged on the end cover 7 are used in cooperation with the lifting device. After the shield 4 is lifted by the lifting device, the lateral position of the shield 4 is positioned by aligning the guide rod 5 with the guide pipe 3 and inserting it. Continue to control the shield 4 to descend a certain height until the bottom side of the shield 4 abuts against the base 1. After the MCR membrane module 2 is sealed by the shield 4, a mixed gas-liquid and a cleaning liquid are respectively sprayed into the inside of the shield 4 through the gas-liquid spray nozzles 6 and the liquid spraying disc 8 to clean the MCR membrane module 2.

[0048] During the cleaning process of the MCR membrane module 2, a mixed gas-liquid is sprayed from the gas-liquid spray nozzles 6. The mixed gas-liquid is a mixture of clean water and compressed gas. By spraying and flushing the MCR membrane module 2 with the mixed gas-liquid, the damage caused to the MCR membrane module 2 by directly impacting with high-pressure water flow can be avoided. A cleaning liquid is sprayed from the liquid spraying disc 8. The cleaning liquid is sprayed onto the MCR membrane module 2 from top to bottom, which can effectively remove the stains on the MCR membrane module 2. When the water in the shield 4 reaches a certain height, the supply of clean water is stopped, and compressed gas and cleaning liquid are continuously introduced into the shield 4. After the compressed gas is sprayed into the water, bubbles are generated, which can blow the water flow in the shield 4, so that the cleaning liquid sprayed from the liquid spraying disc 8 can be evenly mixed into the water body, making the MCR membrane module 2 fully contact with the cleaning liquid, greatly improving the cleaning effect of the MCR membrane module 2. At the same time, after the water surface in the shield 4 submerges the MCR membrane module 2, the MCR membrane module 2 can be soaked for a period of time to better remove the stains on the MCR membrane module 2. During the soaking process, the compressed gas can be continuously introduced into the shield 4 to make the water flow, which can continuously wash the membrane sheets in the MCR membrane module 2 and improve the cleaning effect.

[0049] Specifically, as Figure 4As shown, a gas-liquid cavity 101 is provided inside the base 1, and the mixed gas-liquid sprayed by the gas-liquid nozzle 6 is provided by the gas-liquid cavity 101. The gas-liquid cavity 101 includes a mixing circuit 1011 and a flow circuit 1012 that communicate with each other. Both the mixing circuit 1011 and the flow circuit 1012 are square. The flow circuit 1012 is arranged in the inner circle of the mixing circuit 1011. An air supply pipe 11 and a water supply pipe 12 are respectively connected to the mixing circuit 1011, and the air supply pipe 11 and the water supply pipe 12 are symmetrically arranged at both side positions of the mixing circuit 1011. The mixing circuit 1011 and the flow circuit 1012 are connected by two connecting pipes 105, which are symmetrically arranged at the other two side positions.

[0050] Among them, when spraying the mixed gas-liquid, first pass clear water into the mixing circuit 1011. When clear water flows out of the gas-liquid nozzle 6, then open the air supply pipe 11 to pass compressed gas into the mixing circuit 1011. The compressed gas enters the mixing circuit 1011 filled with clear water, mixes with the clear water, and then enters the flow circuit 1012 through the connecting pipe 105, and finally is sprayed out through the gas-liquid nozzle 6. By flushing the MCR membrane module 2 with the mixed gas-liquid, the stains on the MCR membrane module 2 can be more effectively washed away, making the cleaning of the MCR membrane module 2 more thorough. At the same time, the damage caused by the impact of high-pressure water flow on the MCR membrane module 2 can be reduced, and the membrane sheets can be prevented from being damaged during the cleaning process.

[0051] In this embodiment, a drain pipe is also provided on the shield 4. After the MCR membrane module 2 is cleaned and soaked, the water in the shield 4 is centrally discharged through the drain pipe to prevent the water pollution environment after cleaning the MCR membrane module 2. After the MCR membrane module 2 is cleaned with the cleaning liquid, it is necessary to repeat the clear water rinsing two to three times to wash the cleaning liquid on the MCR membrane module 2 clean.

[0052] Furthermore, as Figure 3 shown, the mounting hole extends inward to form an upper plate 701 and a lower plate 702. A number of arc-shaped grooves 703 are formed on the upper plate 701 and the lower plate 702. A clamping groove is reserved between the upper plate 701 and the lower plate 702. 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, and 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 extends outward from the outer circle of the liquid spraying disc 8, and four exhaust ports 802 are circumferentially arranged on the extension plate 801.

[0053] Specifically, the number of arc-shaped grooves 703 formed on the upper plate 701 and the lower plate 702 is four each, and they are circumferentially equally spaced and arrayed, and the positions of the arc-shaped grooves 703 on the upper plate 701 and the lower plate 702 are the same. As Figure 5As shown, the number of exhaust ports 802 formed on the extension plate 801 is four, which are evenly distributed in a circumferential array. The four exhaust ports 802 are arranged in a wavy shape around the extension plate 801, that is, the four exhaust ports 802 are spliced end to end. Among them, when the upper opening of the exhaust port 802 faces the arc-shaped groove 703 formed on the upper plate 701, the lower opening of the exhaust port 802 is blocked by the lower plate 702. If the upper opening of the exhaust port 802 is blocked by the upper plate 701, the lower opening of the exhaust port 802 faces the position of the arc-shaped groove 703 formed on the lower plate 702. Therefore, the air flow entering the exhaust port 802 through the arc-shaped groove 703 on the lower plate 702 needs to push the liquid spraying disc 8 to rotate. After the liquid spraying disc 8 rotates until the upper opening of the exhaust port 802 faces the arc-shaped groove 703 formed on the upper plate 701, it can be discharged.

[0054] Further, as Figure 6 shown, a plurality of liquid spraying holes 803 with equal apertures are arranged at the bottom of the liquid spraying disc 8.

[0055] During the cleaning process of the MCR membrane module 2, when the water in the shield 4 accumulates to a certain liquid level height, by continuously introducing compressed air into the shield 4 and closing the water supply pipe 12 to stop the introduction of clean water, after the compressed air is introduced into the shield 4, bubbles are generated in the water and float upward, prompting the water in the shield 4 to flow, thereby promoting the cleaning of the MCR membrane module 2.

[0056] After the compressed gas passes through the water surface, the continuously introduced gas causes the internal pressure of the shield 4 to increase. The formed compressed gas enters the exhaust port 802 through the arc-shaped groove 703 on the lower plate 702 and flows upward along the exhaust port 802. The air flow continuously entering the exhaust port 802 pushes the entire liquid spraying disc 8 to rotate, enabling the air flow entering the exhaust port 802 to be discharged smoothly while driving the rotation of the entire liquid spraying disc 8. During the rotation of the liquid spraying disc 8, the upper and lower openings of the exhaust port 802 are respectively continuously coincident with and separated from the arc-shaped groove 703 on the upper plate 701 and the arc-shaped groove 703 on the lower plate 702, realizing the entire exhaust cycle.

[0057] In this embodiment, a rotating retaining ring 9 is arranged on the side of the extension plate 801 that fits with the lower plate 702. The rotating retaining ring 9 is specifically a thrust bearing, and the thrust bearing can effectively reduce the sliding friction generated when the liquid spraying disc 8 rotates. 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 there is a space between the lower bottom surface of the extension plate 801 and the lower plate 702, avoiding contact between the extension plate 801 and the lower plate 702. When the liquid spraying disc 8 rotates, no sliding friction will occur 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 consumption, enabling most of the energy of the compressed gas to be used to drive the rotation of the liquid spraying disc 8.

[0058] In this embodiment, as Figure 7 shown, a buffer cavity is provided inside the guide rod 5. One end of the guide rod 5 is open, and a frustum is recessed from the open end towards the inside of the buffer cavity. The center of the frustum is provided with an opening, and the size of the opening is less than one-third of the outer diameter of the guide rod 5. The other end is closed. A sealing sleeve 503 is fixedly sleeved on the outer ring of the open end of the guide rod 5, and a pressure relief hole 502 is provided at the closed end. The buffer cavity communicates 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 open end of the guide rod 5 and finally is discharged through the pressure relief hole 502. The aperture of the sealing sleeve 503 is equal to the inner diameter of the inner cavity of the guide tube 3.

[0059] During the installation process 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 frustum and is discharged through the pressure relief hole 502 after passing through the buffer cavity. By reducing the aperture for gas passage and the discharge aperture, the shield 4 can descend smoothly during the installation process without the need to control the descent speed through a lifting device, ensuring the stability of the entire shield 4 installation and the safety of the operation.

[0060] Furthermore, as Figure 3 shown, a driver 13 is provided on the end cap 7. The driver 13 is connected to the guide rod 5 and is used to drive 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 open section of the guide tube 3. The bottom of the shield 4 is tightly attached to the upper surface of the base 1 after the external thread 501 on the guide rod 5 and the internal thread 301 on the guide tube 3 are engaged with each other.

[0061] The shield 4 descends smoothly until the external thread 501 provided on the guide rod 5 contacts the guide tube 3. Then, the driver 13 drives the guide rod 5 to rotate, so that the guide rod 5 continues to move downward along the axis until the bottom of the shield 4 abuts against the base 1. Among them, the length of the guide rod 5 is less than the cavity depth of the guide tube 3. Therefore, the bottom side of the shield 4 can smoothly abut against the base 1. By means of thread engagement, the shield 4 can be firmly fixed on the base 1, preventing contact gaps from appearing between the bottom side of the shield 4 and the base 1, and greatly improving the tightness of the entire shield 4.

[0062] Further, a square outer convex edge 102 and a square inner convex edge 103 are provided on the base 1. A square card slot 104 for clamping the bottom side edge of the shield 4 is reserved between the square outer convex edge 102 and the square inner convex edge 103. The slot width of the square card slot 104 is greater than the side wall thickness of the shield 4. The inside of the square inner convex edge 103 is hollow and communicates with the flow circuit 1012. The gas-liquid spray head 6 is arranged on the square inner convex edge 103. A sealing ring 14 is arranged on the bottom side edge of the shield 4. The sealing ring 14 can further improve the sealing effect and prevent water from seeping out from the bottom side edge of the shield 4 after a large amount of water is introduced into the inside of the shield 4.

[0063] In this embodiment, the width of the sealing ring 14 is greater than the slot width of the square card slot 104 and the sealing ring 14 itself has elasticity. When the sealing ring 14 contacts the square card slot 104, due to the elasticity of the sealing ring 14 itself, the sealing ring 14 will be squeezed into the square card slot 104 as the shield 4 continues to descend. And because the width of the sealing ring 14 is greater than the slot width of the square slot, the sealing ring 14 can completely fill the entire square slot. Through the size setting of the sealing ring 14, the sealing performance between the entire shield 4 and the base 1 is increased, and the possibility of water seepage is reduced.

[0064] The side of the shield 4 is made of a transparent material, which helps the staff to observe the cleaning situation of the MCR membrane module 2 in real time.

[0065] Based on the above automatic cleaning device, the present invention also relates to an MCR membrane automatic cleaning method for dyeing wastewater treatment, which specifically includes the following operation steps:

[0066] S1. Fix the base 1 on the ground, and hoist the MCR membrane module 2 onto the base 1 through a hoisting device and fix it;

[0067] S2. After hoisting the shield 4 by the hoisting device, insert the guide rod 5 into the guide tube 3 to position the shield 4, and control the shield 4 to descend until the side edge at the bottom of the shield 4 is clamped into the square card slot 104;

[0068] S3. First, introduce clean water into the water supply pipe 12. After the clean water fills the mixing circuit 1011, introduce compressed gas into the mixing circuit 1011 through the gas supply pipe 11. The compressed gas is mixed with water and then enters the flow circuit 1012, and finally sprays out through the gas-liquid spray head 6. When the gas-liquid mixture is sprayed outwards by the gas-liquid spray head 6, the cleaning liquid is sprayed onto the MCR membrane module 2 through the liquid spraying disc 8;

[0069] S4. Continuously spray the cleaning liquid and the mixed gas-liquid onto the MCR membrane module 2 sealed by the shield 4 until the MCR membrane module 2 is immersed, and perform an immersion treatment on the MCR membrane module 2 for a period of time. During the immersion process, continuously introduce gas into the inner cavity of the shield 4 to disturb the water body. After soaking for a period of time, drain the cleaning liquid through the drain pipe, repeat twice to remove the stains on the MCR membrane module 2;

[0070] S5. After the cleaning liquid is drained completely, re-spray the mixed gas-liquid into the shield 4 through the gas-liquid spray head 6, and at the same time spray clean water into the shield 4 through the liquid spraying disc 8 to rinse the MCR membrane module 2 with clean water. After the rinsing is completed, reinstall the MCR membrane module 2 into the membrane tank 17 to complete the cleaning step of the entire MCR membrane module 2.

[0071] Embodiment 2:

[0072] As Figure 8 and Figure 9 shown, the entire automatic cleaning device is installed in the membrane tank 17 for use. By setting the cleaning device in the membrane tank 17, the MCR membrane module 2 can be cleaned without completely draining the water in the membrane tank 17.

[0073] Specifically, on both sides of the membrane tank 17 are the sewage tank 16 and the clean water tank 18. The water in the sewage tank 16 enters the membrane tank 17 after preliminary filtration through the filter plate, and after further treatment by the MCR membrane module 2, it is introduced into the clean water tank 18.

[0074] In this embodiment, six bases 1 are equidistantly arranged in the membrane tank 17, and the MCR membrane module 2 is fixed in the middle of the base 1. Among them, the distance of 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, the distance of the external thread 501 arranged on the guide rod 5 accounts for 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 tank 17, when it is necessary to clean the MCR membrane module 2, the hood 4 is lifted above one of the MCR membrane modules 2 by a hoisting device. First, the entire hood 4 is positioned by inserting the guide rod 5 into the guide tube 3. The guide rod 5 is driven to rotate by the driver 13, so that the hood 4 descends into the membrane tank 17 in a thread feed manner. During the descent of the hood 4, the water body in the area of the MCR membrane module 2 is first covered inside, and a cavity is formed between the water body and the hood 4. During the continuous descent of the hood 4, the air in the cavity is compressed and finally discharged through the exhaust port 802 on the liquid spraying disc 8. At the same time, the external water is continuously pressed into the interior of the hood 4 to replace the discharged air. When the hood 4 is completely abutted against the base 1 and sealed, the water inside the hood 4 is discharged into the membrane tank 17 through the drain pipe. After the water in the hood 4 is completely drained, a mixed gas-liquid and a cleaning liquid are respectively introduced into the hood 4 through the gas-liquid nozzle 6 and the liquid spraying disc 8, and the cleaning method in the first embodiment is repeated until the MCR membrane module 2 is cleaned up.

[0075] The sealing of the MCR membrane module 2 is achieved through the mutual cooperation of the hood 4 and the base 1, so as to realize the on-line cleaning of a single MCR membrane module 2. At the same time, it does not interfere with the normal operation of other MCR membrane modules 2. The MCR membrane module 2 can be cleaned without completely draining the water to be treated in the entire membrane tank 17, which improves the working efficiency of the entire MCR membrane module 2.

[0076] Working principle:

[0077] The cleaning of the MCR membrane module 2 is divided into three processes: flushing, soaking, and rinsing. First, after sealing the MCR membrane module 2 through the shield 4, the MCR membrane module 2 is flushed. During the flushing process, a mixed gas-liquid is sprayed onto the MCR membrane module 2 through the gas-liquid nozzle 6 to initially flush the stains on the outside of the MCR membrane module 2. At the same time, a cleaning liquid is sprayed onto the MCR membrane module 2 through the liquid spraying disc 8. During the spraying process, the continuously introduced compressed gas is discharged through the exhaust port 802 on the liquid spraying disc 8 and drives the liquid spraying disc 8 to rotate simultaneously, so that the cleaning liquid sprayed by the liquid spraying disc 8 can fall more evenly on the MCR membrane module 2, ensuring more thorough cleaning of the MCR membrane module 2. When the water in the shield 4 accumulates to a certain height and the water level submerges the gas-liquid nozzle 6, at this time, the mixed gas-liquid sprayed from the gas-liquid nozzle 6 is blocked by the water body and no longer sprays onto the MCR membrane module 2 for flushing, and it changes from flushing to soaking. During the soaking process, a mixed gas-liquid and a cleaning liquid are continuously introduced until the water level in the shield 4 is higher than the MCR membrane module 2. At this time, the introduction of clean water and the cleaning liquid is stopped, and compressed gas is continuously introduced to stir the water flow in the shield 4, so that the cleaning liquid can be evenly distributed in the entire water body, improving the cleaning effect on the MCR membrane module 2. After soaking for a certain period of time, the water in the shield 4 is completely drained through the drain pipe, and clean water is introduced into the shield 4 again to rinse the entire MCR membrane module 2. After repeating the rinsing more than twice, the cleaning of the entire MCR membrane module 2 is completed.

[0078] For the liquid spraying disc 8, in the mixed gas-liquid sprayed from the gas-liquid nozzle 6, most of the liquid adheres to the MCR membrane module 2, and the gas enters the exhaust port 802 through the arc-shaped groove 703 of the lower plate 702, flows upward through the exhaust port 802, and is discharged from the arc-shaped 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 exactly opposite to the position of the arc-shaped groove 703 of the lower plate 702. At this time, the inner cavity of the shield 4 is connected to the exhaust port 802 through the arc-shaped groove 703 of the lower plate 702, and the upper part of the exhaust port 802 is exactly separated from the arc-shaped groove 703 of the upper plate 701. When the gas inside the shield 4 continuously squeezes into the exhaust port 802 through the arc-shaped groove 703 of the lower plate 702, it will push the liquid spraying disc 8 to rotate, so that the upper opening of the exhaust port 802 rotates to coincide with the arc-shaped groove 703 of the upper plate 701, so that the gas in the exhaust port 802 can be discharged through the arc-shaped groove 703 of the upper plate 701. At the same time, the liquid spraying disc 8 continues to rotate. After rotating back to the initial position again, the above exhaust cycle is repeated, so that the gas realizes rotation.

[0079] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all such changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended 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 spraying 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 to cooperate with the lifting device; The mounting hole extends to 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 lower plate (702); the liquid spraying disc (8) is rotatably arranged in the mounting hole through the clamping groove; an extension plate (801) for clamping with the clamping groove is extended outward from the outer circle of the liquid spraying disc (8); and a plurality of exhaust ports (802) are equidistantly arranged on the circumference of the extension plate (801); The end cover (7) is provided with a driver (13), the driver (13) being connected to the guide rod (5) and 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), and an internal thread (301) is provided inside the opening section of the guide tube (3); The exhaust port (802) is arranged in a wave-like manner on the extension plate (801), that is, the exhaust port (802) is spliced ​​end to end; wherein, when the upper end opening of the exhaust port (802) is directly opposite to the arc-shaped 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-shaped groove (703) provided on the lower plate (702); therefore, the airflow entering the exhaust port (802) through the arc-shaped groove (703) on the lower plate (702) needs to push the liquid spraying disc (8) to rotate, so that the liquid spraying disc (8) can be discharged only after it rotates to the point where the upper end opening of the exhaust port (802) is directly opposite to the arc-shaped groove (703) provided on the upper plate (701).

2. The MCR membrane automatic cleaning device for dyeing wastewater treatment according to claim 1 is characterized in that: A liquid supply pipe (10) is rotatably connected to the liquid spray disc (8), and 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 treating printing and dyeing wastewater according to claim 2 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 3 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 4 is characterized in that: The outer thread (501) on the guide rod (5) at the bottom of the shield (4) and the inner thread (301) on the guide tube (3) are meshed with each other and are tightly fitted on 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 6 is characterized by: 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 7, 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 8, 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 claim 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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