Low-pressure permeable membrane production tailing recovery device

Abstract

The invention belongs to the technical field of low-pressure permeable membrane production, and particularly relates to a low-pressure permeable membrane production tailing recovery device. The circulating pipeline is arranged in the concentration box; the discharging pipeline is fixedly connected to the bottom of the concentration box in a communicating manner and is communicated with the circulating pipeline through the discharging opening; the main pipeline is communicated with and penetrates through one side wall of the concentration box; through cooperation of a rubber rod and a cross plate, a second motor is started, an output shaft of the second motor drives a rotating block to rotate, a pushing column is driven to rotate through the rotating block, the pushing column pushes the cross plate by pressing a sliding opening in the rotating process, the cross plate is limited by a cross rod and horizontally slides on the cross rod, and under the action of the pushing column and the cross rod, the cross plate can slide on the cross rod. The cross plate reciprocates, the rubber rod is driven by the cross plate to reciprocate, and the rubber rod knocks the circulating pipeline and the RO reverse osmosis membrane in a reciprocating manner, so that impurities on the inner wall of the circulating pipeline fall off and flow into the separation box along with water flow, and the function of fully cleaning the inner wall of the circulating pipeline is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-pressure permeable membrane production, and specifically relates to a device for recycling the tailings in low-pressure permeable membrane production. Background Art

[0002] The production of low-pressure permeable membranes involves reverse osmosis technology. Reverse osmosis is a membrane separation process driven by pressure. The solute and solvent in the solution are separated through the selective retention of a semi-permeable membrane. When the same volume of dilute solution and concentrated solution are placed on both sides of the semi-permeable membrane respectively, the solvent in the dilute solution will naturally pass through the semi-permeable membrane and spontaneously flow to the concentrated solution side. During the production process, in order to ensure productivity, after obtaining the feed liquid with the required concentration, it is often necessary to recycle the high-concentration production tailings.

[0003] A Chinese patent with the publication number CN214486403U discloses a device for recycling the tailings in reverse osmosis membrane production, including a reverse osmosis membrane concentration device provided with a feed pipeline. A feed manual butterfly valve is provided on the feed pipeline. The feed pipeline is connected to the main pipeline. The other end of the main pipeline is connected to a circulation pipeline, and a circulation manual butterfly valve is provided on the main pipeline. The circulation pipeline is connected to the discharge pipeline through a discharge port. A discharge pipeline and a recovery pipeline are provided on the discharge pipeline. A discharge manual butterfly valve is provided on the discharge pipeline, and a recovery manual butterfly valve and a pneumatic diaphragm pump are provided on the recovery pipeline. After the concentration is completed, the feed manual butterfly valve and the discharge manual butterfly valve are closed, and the recovery manual butterfly valve is opened. The pneumatic diaphragm pump is started to recover the high-concentration tailings in the membrane system pipeline. The high-concentration tailings pass through the collection pipeline at the rear end of the pneumatic diaphragm pump and are introduced into the collection tank. Finally, the recovery manual butterfly valve is closed, and the sewage manual butterfly valve is opened to clean the membrane system pipeline and discharge the sewage from the sewage pipeline to complete the work of tailings recovery and cleaning.

[0004] In the above technology, during the production process, as water is continuously removed, impurities such as dissolved salts, minerals, and organic substances in the raw water will gradually concentrate. These impurities may reach a saturated state during the concentration process and then precipitate or crystallize, and may be intercepted by the RO reverse osmosis membrane and attached to the RO reverse osmosis membrane. It is not easy to wash them off directly with clean water, and over time, the membrane pores will be blocked, reducing the service life of the membrane.

[0005] Therefore, the present invention provides a device for recycling the tailings in low-pressure permeable membrane production. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A device for recycling the tailings in low-pressure permeable membrane production according to the present invention includes:

[0008] Concentrating tank;

[0009] Circulation pipeline, arranged inside the concentrating tank;

[0010] Discharge pipeline, connected and fixed at the bottom of the concentrating tank, and communicated with the circulation pipeline through the discharge port;

[0011] Main pipeline, communicated and penetrated through one side wall of the concentrating tank, and connected and fixed at one end of the circulation pipeline;

[0012] Feeding pipeline, connected and fixed on the main pipeline;

[0013] Water inlet pipeline, connected and fixed on the feeding pipe;

[0014] Knocking mechanism, arranged at the bottom end of the circulation pipeline;

[0015] The knocking mechanism includes a plurality of rubber rods and a cross plate,

[0016] A plurality of the rubber rods are all fixed on the cross plate;

[0017] Two cross bars are fixed on the inner wall of the concentrating tank, and the cross plate is slidably connected to the cross bars;

[0018] A second motor is fixed on the outer wall of the concentrating tank, and the output shaft of the second motor is rotatably connected to the concentrating tank through a bearing;

[0019] The output shaft of the second motor is fixed with a rotating block, and a pushing column is fixed at one end of the rotating block away from the output shaft;

[0020] A sliding opening is formed at the top end of the cross plate, and the pushing column slides in the sliding opening;

[0021] A discharge pipeline, a recovery pipeline and a water outlet pipeline are connected and fixed at the bottom end of the discharge pipeline;

[0022] One end of the water outlet pipeline is connected and fixed with a separation tank.

[0023] Preferably, a filter plate and a nanofiltration membrane are fixed in the separation tank, the filter plate and the nanofiltration membrane are arranged in parallel, and the filter plate is arranged at one end close to the water outlet pipeline; a sewage discharge pipe is connected and fixed at one end of the separation tank close to the filter plate, and a solenoid valve is installed on the sewage discharge pipe; a first communication pipe is connected and fixed at one end of the separation tank away from the filter tank, and one end of the first communication pipe is connected and fixed on the water inlet pipeline; a first water pump is installed on the first communication pipe.

[0024] Preferably, a first motor is fixedly connected to the top of the separation box. The output shaft of the first motor is fixedly connected to a reciprocating lead screw. Both ends of the reciprocating lead screw are rotatably connected to the separation box through bearings. A moving plate is threadedly connected to the reciprocating lead screw. A cleaning brush is fixedly connected to the side wall of the moving plate. The cleaning brush is attached to the surface of the filter plate and is arranged at one end close to the water outlet pipe. Two guide rods are fixedly connected to the separation box, and the moving plate slides on the two guide rods.

[0025] Preferably, the feed pipe is arranged above the water inlet pipe, and a second butterfly valve is installed on the feed pipe; a third butterfly valve is installed on the water inlet pipe.

[0026] Preferably, the discharge pipe is arranged above the recovery pipe, and a fourth butterfly valve is installed on the discharge pipe; a fifth butterfly valve is installed on the recovery pipe; the water outlet pipe is connected and fixed to the bottom of the discharge pipe, and a sixth butterfly valve is installed on the water outlet pipe; one end of the recovery pipe is connected and fixed to a collection tank, and a pneumatic diaphragm pump is fixedly connected to the side wall of the collection tank through a connecting plate; the pneumatic diaphragm pump is installed on the recovery pipe.

[0027] Preferably, a second connecting pipe is connected and fixed to the separation box. One end of the second connecting pipe is arranged between the filter plate and the nanofiltration membrane, and the other end of the second connecting pipe is connected and fixed to the collection tank. A second water pump is installed on the second connecting pipe.

[0028] Preferably, a temperature sensor is fixedly connected to the inner wall of the top of the concentration tank. A plurality of heating pipes are fixedly connected to the side wall of the concentration tank far from the main pipe, and the heating pipes are electrically connected to the temperature sensor.

[0029] Preferably, a pressure pump and a first butterfly valve are installed on the main pipe. The pressure pump is arranged outside the concentration tank, and the first butterfly valve is arranged inside the concentration tank.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. For the low-pressure membrane permeation production tail material recovery device of the present invention, through the cooperation of the rubber rod and the cross plate, during the cleaning process, the second motor is turned on. The output shaft of the second motor drives the rotating block to rotate. The rotating block drives the pushing column to rotate. During the rotation of the pushing column, the cross plate is pushed by pressing the sliding port. The cross plate is restricted by the cross bar and slides horizontally on the cross bar. Under the action of the pushing column and the cross bar, the cross plate reciprocates. The cross plate drives the rubber rod to reciprocate. The rubber rod reciprocally knocks the circulation pipe and the RO reverse osmosis membrane, so that the impurities on the inner wall of the circulation pipe fall off and flow into the separation box with the water flow, thereby realizing the function of fully cleaning the inner wall of the circulation pipe.

[0032] 2. The waste material recovery device for low-pressure permeable membrane production according to the present invention, by setting a filter plate and a nanofiltration membrane, the sewage on the inner wall of the flushing circulation pipeline flows to the separation tank through the water outlet pipeline, and sequentially passes through the filter plate and the nanofiltration membrane in the separation tank. The large-particle impurities are filtered by the filter plate, and the large-particle impurities are finally discharged through the sewage discharge pipe; when passing through the nanofiltration membrane, many fine micropores densely distributed on the surface of the nanofiltration membrane only allow water and small-molecule substances to pass through and become the permeate liquid, and the permeate liquid finally flows to the water inlet pipeline through the first connecting pipe for cleaning; while the substances with a volume larger than the micropore diameter on the membrane surface are retained on the liquid inlet side of the membrane and become the concentrated liquid, and the concentrated liquid finally flows to the collection tank through the second connecting pipe for recovery; thus realizing the separation and recycling of sewage.

[0033] 3. The waste material recovery device for low-pressure permeable membrane production according to the present invention, by setting a cleaning brush, by starting the first motor, the first motor drives the reciprocating screw rod to rotate through the output shaft, the reciprocating screw rod drives the moving plate to reciprocate up and down, and the moving plate drives the cleaning brush to reciprocate up and down to sweep away the impurities on the filter plate and fall into the separation tank, and finally discharges through the sewage discharge pipe, realizing the function of cleaning the filter plate; when the moving plate is moving, the moving plate slides on the guide rod, and the guide rod limits the moving plate to move in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Figure 1 is the first three-dimensional view of the present invention;

[0036] Figure 2 is the second three-dimensional view of the present invention;

[0037] Figure 3 is the cross-sectional view of the concentration tank and the circulation pipeline of the present invention;

[0038] Figure 4 is the cross-sectional view of the separation tank of the present invention;

[0039] Figure 5 is the structural schematic diagram of the circulation pipeline of the present invention;

[0040] Figure 6 is the structural schematic diagram of the cross-shaped plate of the present invention;

[0041] Figure 7 is the structural schematic diagram of the filter plate of the present invention;

[0042] In the figure: 1. Concentrating tank; 11. Temperature sensor; 12. Heating pipe; 13. Discharge port; 2. Circulation pipeline; 21. Pressure pump; 22. First butterfly valve; 23. Main pipeline; 24. Feed pipeline; 241. Second butterfly valve; 25. Water inlet pipeline; 251. Third butterfly valve; 3. Discharge pipeline; 31. Discharge pipe; 32. Fourth butterfly valve; 33. Recovery pipeline; 34. Fifth butterfly valve; 35. Pneumatic diaphragm pump; 36. Collection tank; 37. Connecting plate; 38. Water outlet pipeline; 39. Sixth butterfly valve; 4. Separation tank; 41. Sewage pipe; 42. Solenoid valve; 43. First connecting pipe; 44. First water pump; 45. Second connecting pipe; 46. Second water pump; 47. First motor; 471. Reciprocating lead screw; 472. Guide rod; 473. Moving plate; 474. Cleaning brush; 48. Nanofiltration membrane; 49. Filter plate; 5. Second motor; 51. Cross plate; 52. Cross bar; 53. Sliding opening; 54. Rotating block; 55. Pushing column; 56. Rubber rod. Detailed implementation manners

[0043] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0044] As Figures 1 to 7 shown, a device for recycling the tailings of low-pressure membrane production according to an embodiment of the present invention includes: a concentrating tank 1; a circulation pipeline 2 provided inside the concentrating tank 1; a discharge pipeline 3 communicatively and fixedly connected to the bottom of the concentrating tank 1 and communicating with the circulation pipeline 2 through a discharge port 13; a main pipeline 23 communicatively penetrating through a side wall of the concentrating tank 1 and communicatively and fixedly connected to one end of the circulation pipeline 2; a feed pipeline 24 communicatively and fixedly connected to the main pipeline 23; a water inlet pipeline 25 communicatively and fixedly connected to the feed pipe; a knocking mechanism provided at the bottom end of the circulation pipeline 2; the knocking mechanism includes a plurality of rubber rods 56 and a cross plate 51, and the plurality of rubber rods 56 are all fixedly connected to the cross plate 51; two cross bars 52 are fixedly connected to the inner wall of the concentrating tank 1, and the cross plate 51 is slidably connected to the cross bars 52; a second motor 5 is fixedly connected to the outer wall of the concentrating tank 1, and an output shaft of the second motor 5 is rotatably connected to the concentrating tank 1 through a bearing; the output shaft of the second motor 5 is fixedly connected to a rotating block 54, and a pushing column 55 is fixedly connected to an end of the rotating block 54 away from the output shaft; a sliding opening 53 is formed at the top end of the cross plate 51, and the pushing column 55 slides in the sliding opening 53; the bottom end of the discharge pipeline 3 is communicatively and fixedly connected to a discharge pipe 31, a recovery pipeline 33 and a water outlet pipeline 38; one end of the water outlet pipeline 38 is communicatively and fixedly connected to a separation tank 4.

[0045] First, close all valves. After starting the work, open the first butterfly valve 22 and the second butterfly valve 241, and introduce raw materials into the concentration tank 1 through the feed pipeline 24. Then start the RO reverse osmosis membrane concentration work, and concentrate and react through the circulation pipeline 2 to obtain the feed liquid with the required concentration. Then open the fourth butterfly valve 32 so that the solution is discharged from the discharge port 13 through the discharge pipeline 31. Next, after the RO reverse osmosis membrane concentration ends and the machine stops, close the second butterfly valve 241 and the fourth butterfly valve 32, and open the fifth butterfly valve 34. Start the pneumatic diaphragm pump 35 to recover the high-concentration tailings in the membrane system pipeline. The high-concentration tailings are introduced into the collection tank 36 through the recovery pipeline 33 at the rear end of the pneumatic diaphragm pump 35. Finally, close the fifth butterfly valve 34, and open the third butterfly valve 251 and the sixth butterfly valve 39 to clean the membrane system pipeline, and discharge the sewage from the water outlet pipeline 38 into the separation tank 4.

[0046] During the production process, as water is continuously removed, impurities such as dissolved salts, minerals, and organic matters in the raw water will gradually concentrate. These impurities may reach a saturated state during the concentration process, and then precipitate or crystallize. They may be intercepted by the RO reverse osmosis membrane and adhere to the RO reverse osmosis membrane. It is not easy to wash them off directly with clean water. Over time, the membrane pores will be blocked, reducing the service life of the membrane. When the knocking mechanism provided by the present invention is in use, during the cleaning process, start the second motor 5. The output shaft of the second motor 5 drives the rotating block 54 to rotate. The rotating block 54 drives the pushing column 55 to rotate. During the rotation of the pushing column 55, it pushes the cross plate 51 through the pressing sliding port 53. The cross plate 51 is restricted by the cross bar 52 and slides horizontally on the cross bar 52. Under the action of the pushing column 55 and the cross bar 52, the cross plate 51 reciprocates. The cross plate 51 drives the rubber rod 56 to reciprocate. The rubber rod 56 reciprocally knocks on the circulation pipeline 2 and the RO reverse osmosis membrane, causing the impurities on the inner wall of the circulation pipeline 2 to fall off and flow into the separation tank 4 with the water flow, thereby realizing the function of fully cleaning the inner wall of the circulation pipeline 2.

[0047] As Figure 4 shown, a filter plate 49 and a nanofiltration membrane 48 are fixedly connected inside the separation tank 4. The filter plate 49 and the nanofiltration membrane 48 are arranged in parallel, and the filter plate 49 is arranged at one end close to the water outlet pipeline 38. One end of the separation tank 4 close to the filter plate 49 is connected and fixedly provided with a sewage discharge pipe 41, and a solenoid valve 42 is installed on the sewage discharge pipe 41. One end of the separation tank 4 far from the filter tank is connected and fixedly provided with a first connecting pipe 43. One end of the first connecting pipe 43 is connected and fixedly provided on the water inlet pipeline 25. A first water pump 44 is installed on the first connecting pipe 43.

[0048] When the filter plate 49 and the nanofiltration membrane 48 provided by the present invention are in use, the sewage on the inner wall of the flushing circulation pipeline 2 flows to the separation tank 4 through the water outlet pipeline 38. In the separation tank 4, it successively passes through the filter plate 49 and the nanofiltration membrane 48. The large particulate impurities are filtered by the filter plate 49, and the large particulate impurities are finally discharged through the sewage discharge pipe 41. When passing through the nanofiltration membrane 48, many fine micropores densely distributed on the surface of the nanofiltration membrane 48 only allow water and small molecular substances to pass through and become the permeate. The permeate finally flows to the water inlet pipeline 25 through the first connecting pipe 43 for cleaning. And substances with a volume larger than the micropore diameter on the membrane surface are retained on the liquid inlet side of the membrane and become the concentrated liquid. The concentrated liquid finally flows to the collection tank 36 through the second connecting pipe 45 for recovery. Thus, the separation and recycling of sewage are realized.

[0049] As Figure 4 and Figure 7 shown, a first motor 47 is fixedly connected to the top of the separation tank 4. The output shaft of the first motor 47 is fixedly connected with a reciprocating lead screw 471. Both ends of the reciprocating lead screw 471 are rotationally connected to the separation tank 4 through bearings. A moving plate 473 is threadedly connected to the reciprocating lead screw 471. A cleaning brush 474 is fixedly connected to the side wall of the moving plate 473. The cleaning brush 474 is attached to the surface of the filter plate 49 and is arranged at one end close to the water outlet pipeline 38. Two guide rods 472 are fixedly connected to the separation tank 4. The moving plate 473 slides on the two guide rods 472.

[0050] The cleaning brush 474 provided by the present invention is used to clean the filter plate 49 when in use. When the filter plate 49 filters large particulate impurities, after a period of time, the impurities will block the filter holes of the filter plate 49, which will reduce the flow rate. By turning on the first motor 47, the first motor 47 drives the reciprocating lead screw 471 to rotate through the output shaft. The reciprocating lead screw 471 drives the moving plate 473 to reciprocate up and down. The moving plate 473 drives the cleaning brush 474 to reciprocate up and down, sweeping away the impurities on the filter plate 49 and falling into the separation tank 4, and finally being discharged through the sewage discharge pipe 41, realizing the function of cleaning the filter plate 49. When the moving plate 473 is moving, the moving plate 473 slides on the guide rods 472, and the guide rods 472 limit the moving plate 473 to move in the vertical direction.

[0051] As Figure 1 and Figure 4 shown, the feed pipeline 24 is arranged above the water inlet pipeline 25. A second butterfly valve 241 is installed on the feed pipeline 24. A third butterfly valve 251 is installed on the water inlet pipeline 25.

[0052] When the feed pipe 24 and the water inlet pipe 25 provided by the present invention are in use, after starting to work, the first butterfly valve 22 and the second butterfly valve 241 are opened, and raw materials are introduced into the concentration tank 1 through the feed pipe 24; by opening the third butterfly valve 251, water is introduced through the water inlet pipe 25 to clean the membrane system pipeline.

[0053] As Figure 2 and Figure 3 shown, the discharge pipe 31 is arranged above the recovery pipe 33, and a fourth butterfly valve 32 is installed on the discharge pipe 31; a fifth butterfly valve 34 is installed on the recovery pipe 33; the water outlet pipe 38 is connected and fixed to the bottom of the discharge pipe 3, and a sixth butterfly valve 39 is installed on the water outlet pipe 38; one end of the recovery pipe 33 is connected and fixed to a collection tank 36, and a pneumatic diaphragm pump 35 is fixed to the side wall of the collection tank 36 through a connecting plate 37; the pneumatic diaphragm pump 35 is installed on the recovery pipe 33.

[0054] When the discharge pipe 31, the recovery pipe 33 and the water outlet pipe 38 provided by the present invention are in use, by opening the fourth butterfly valve 32, the solution is discharged from the discharge port 13 through the discharge pipe 31; after the RO reverse osmosis membrane concentration is ended and the machine is shut down, the second butterfly valve 241 and the fourth butterfly valve 32 are closed, and the fifth butterfly valve 34 is opened, and the pneumatic diaphragm pump 35 is started to recover the high-concentration tailings in the membrane system pipeline. The high-concentration tailings pass through the recovery pipe 33 at the rear end of the pneumatic diaphragm pump 35 and are introduced into the collection tank 36; finally, the fifth butterfly valve 34 is closed, and the third butterfly valve 251 and the sixth butterfly valve 39 are opened to clean the membrane system pipeline and discharge the sewage from the water outlet pipe 38 to the separation tank 4.

[0055] As Figure 2 and Figure 5 shown, a second connecting pipe 45 is connected and fixed to the separation tank 4. One end of the second connecting pipe 45 is arranged between the filter plate 49 and the nanofiltration membrane 48, and the other end of the second connecting pipe 45 is connected and fixed to the collection tank 36, and a second water pump 46 is installed on the second connecting pipe 45.

[0056] When the second connecting pipe 45 provided by the present invention is in use, substances with a volume larger than the micropore diameter on the surface of the nanofiltration membrane 48 are retained on the liquid inlet side of the nanofiltration membrane 48 to become concentrated liquid. The second water pump 46 is opened, and the concentrated liquid finally flows to the collection tank 36 through the second connecting pipe 45 for recovery, so as to realize the separation and recycling of the solution.

[0057] As Figure 4 shown, a temperature sensor 11 is fixed to the inner wall of the top of the concentration tank 1, and a plurality of heating pipes 12 are fixed to the side wall of the concentration tank 1 away from the main pipe 23. The heating pipes 12 are electrically connected to the temperature sensor 11.

[0058] The heating tube 12 provided by the present invention is used to heat the stock solution in the concentration tank 1 during use, accelerating the concentration speed. The heating temperature of the heating tube 12 is monitored and controlled by the temperature sensor 11, so that the stock solution is concentrated in a suitable environment.

[0059] As Figure 4 As shown, a pressure pump 21 and a first butterfly valve 22 are installed on the main pipeline 23. The pressure pump 21 is arranged outside the concentration tank 1, and the first butterfly valve 22 is arranged inside the concentration tank 1.

[0060] When the pressure pump 21 provided by the present invention is in use, the pressure in the circulation pipeline 2 is controlled by the pressure pump 21, and the concentration rate and degree can be adjusted to quickly reach the required concentration.

[0061] Working principle: First, close all valves. After starting to work, open the first butterfly valve 22 and the second butterfly valve 241, introduce raw materials into the concentration tank 1 through the feed pipeline 24, and start the RO reverse osmosis membrane concentration work. After concentration and reaction through the circulation pipeline 2, a stock solution with the required concentration is obtained; then open the fourth butterfly valve 32 so that the solution is discharged from the discharge port 13 through the discharge pipeline 31; next, after the RO reverse osmosis membrane concentration ends and the machine stops, close the second butterfly valve 241 and the fourth butterfly valve 32, and open the fifth butterfly valve 34. Start the pneumatic diaphragm pump 35 to recover the high-concentration tailings in the membrane system pipeline. The high-concentration tailings are introduced into the collection tank 36 through the recovery pipeline 33 behind the pneumatic diaphragm pump 35; finally, close the fifth butterfly valve 34, and open the third butterfly valve 251 and the sixth butterfly valve 39 to clean the membrane system pipeline, and discharge the sewage from the water outlet pipeline 38 to the separation tank 4;

[0062] During the production process, as water is continuously removed, impurities such as dissolved salts, minerals, and organic substances in the raw water will gradually concentrate. These impurities may reach a saturated state during the concentration process, and then precipitate or crystallize, and may be intercepted by the RO reverse osmosis membrane and adhere to the RO reverse osmosis membrane. It is not easy to wash off directly with clean water, and it will block the membrane pores for a long time, reducing the service life of the membrane. During the cleaning process, start the second motor 5. The output shaft of the second motor 5 drives the rotating block 54 to rotate. The rotating block 54 drives the push column 55 to rotate. During the rotation of the push column 55, the cross plate 51 is pushed through the pressing sliding port 53. The cross plate 51 is restricted by the cross bar 52 and slides horizontally on the cross bar 52. Under the action of the push column 55 and the cross bar 52, the cross plate 51 reciprocates, driving the rubber rod 56 to reciprocate through the cross plate 51. The rubber rod 56 reciprocally knocks on the circulation pipeline 2 and the RO reverse osmosis membrane, so that the impurities on the inner wall of the circulation pipeline 2 fall off and flow into the separation tank 4 with the water flow, thereby realizing the function of fully cleaning the inner wall of the circulation pipeline 2;

[0063] The sewage on the inner wall of the flushing circulation pipeline 2 flows to the separation tank 4 through the water outlet pipeline 38. In the separation tank 4, it successively passes through the filter plate 49 and the nanofiltration membrane 48. The large-particle impurities are filtered by the filter plate 49, and the large-particle impurities are finally discharged through the sewage discharge pipe 41. When passing through the nanofiltration membrane 48, many fine micropores densely distributed on the surface of the nanofiltration membrane 48 only allow water and small-molecule substances to pass through and become the permeate. The permeate finally flows to the water inlet pipeline 25 through the first connecting pipe 43 for cleaning. And the substances with a volume larger than the micropore diameter on the membrane surface are retained on the feed side of the membrane and become the concentrated liquid. The concentrated liquid finally flows to the collection tank 36 through the second connecting pipe 45 for recycling. Thus, the separation and recycling of sewage are realized.

[0064] When the filter plate 49 filters large-particle impurities, after a period of time, the impurities will block the filter holes of the filter plate 49, which will reduce the flow rate. By starting the first motor 47, the first motor 47 drives the reciprocating lead screw 471 to rotate through the output shaft. The reciprocating lead screw 471 drives the moving plate 473 to move up and down reciprocally. The moving plate 473 drives the cleaning brush 474 to move up and down reciprocally, sweeping the impurities on the filter plate 49 and falling into the separation tank 4, and finally discharging through the sewage discharge pipe 41, realizing the function of cleaning the filter plate 49. When the moving plate 473 is moving, the moving plate 473 slides on the guide rod 472, and the guide rod 472 limits the moving plate 473 to move in the vertical direction.

[0065] The above shows and describes 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. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-pressure membrane production tailings recovery device, comprising: Concentration tank (1); A circulation pipeline (2) is arranged inside the concentration tank (1); A discharge pipe (3) is connected and fixed to the bottom of the concentration tank (1), and is connected to the circulation pipe (2) through a discharge port (13); A main pipeline (23) is connected and penetrates a side wall of the concentration tank (1), and is connected and fixedly connected to one end of the circulation pipeline (2); A feed pipe (24) is connected and fixedly connected to the main pipe (23); A water inlet pipe (25) connected and fixed to the feed pipe; A knocking mechanism is arranged at the bottom end of the circulation pipe (2); Features: The knocking mechanism comprises a plurality of rubber rods (56) and a cross plate (51). The plurality of rubber rods (56) are all fixedly connected to the cross plate (51); Two cross bars (52) are fixedly connected to the inner wall of the concentration box (1), and the cross plate (51) is slidably connected to the cross bars (52); A second motor (5) is fixedly connected to the outer wall of the concentration tank (1), and an output shaft of the second motor (5) is rotatably connected to the concentration tank (1) via a bearing; The output shaft of the second motor (5) is fixedly connected to a rotating block (54), and one end of the rotating block (54) away from the output shaft is fixedly connected to a pushing column (55); The top end of the cross plate (51) is provided with a sliding opening (53), and the push column (55) slides in the sliding opening (53); The bottom end of the discharge pipe (3) is connected and fixedly connected to a discharge pipe (31), a recovery pipe (33) and a water outlet pipe (38); One end of the water outlet pipe (38) is connected to and fixedly connected with a separation box (4).

2. A low-pressure membrane production tailings recovery device according to claim 1, characterized in that: A filter plate (49) and a nanofiltration membrane (48) are fixedly connected in the separation box (4), and the filter plate (49) and the nanofiltration membrane (48) are arranged in parallel, and the filter plate (49) is arranged at one end close to the water outlet pipe (38); the end of the separation box (4) close to the filter plate (49) is connected and fixedly connected to a sewage pipe (41), and a solenoid valve (42) is installed on the sewage pipe (41); the end of the separation box (4) away from the filter box is connected and fixedly connected to a first connecting pipe (43), and one end of the first connecting pipe (43) is connected and fixedly connected to the water inlet pipe (25); the first connecting pipe (43) is installed with a first water pump (44).

3. A low-pressure membrane production tailings recovery device according to claim 2, characterized in that: A first motor (47) is fixedly connected to the top of the separation box (4); a reciprocating screw rod (471) is fixedly connected to the output shaft of the first motor (47); both ends of the reciprocating screw rod (471) are rotatably connected to the separation box (4) via bearings; a movable plate (473) is threadedly connected to the reciprocating screw rod (471); a cleaning brush (474) is fixedly connected to the side wall of the movable plate (473); the cleaning brush (474) is in contact with the surface of the filter plate (49) and is arranged at one end close to the water outlet pipe (38); two guide rods (472) are fixedly connected to the separation box (4); and the movable plate (473) slides on the two guide rods (472).

4. A low-pressure membrane production tailings recovery device according to claim 3, characterized in that: The feed pipe (24) is arranged above the water inlet pipe (25), and a second butterfly valve (241) is installed on the feed pipe (24); and a third butterfly valve (251) is installed on the water inlet pipe (25).

5. A low-pressure membrane production tailings recovery device according to claim 4, characterized in that: The discharge pipe (31) is arranged above the recovery pipe (33), and a fourth butterfly valve (32) is installed on the discharge pipe (31); a fifth butterfly valve (34) is installed on the recovery pipe (33); the water outlet pipe (38) is connected and fixedly connected to the bottom of the discharge pipe (3), and a sixth butterfly valve (39) is installed on the water outlet pipe (38); one end of the recovery pipe (33) is connected and fixedly connected to a collection tank (36), and a pneumatic diaphragm pump (35) is fixedly connected to the side wall of the collection tank (36) via a connecting plate (37); the pneumatic diaphragm pump (35) is installed on the recovery pipe (33).

6. A low-pressure membrane production tailings recovery device according to claim 5, characterized in that: A second connecting pipe (45) is connected and fixedly connected to the separation box (4); one end of the second connecting pipe (45) is arranged between the filter plate (49) and the nanofiltration membrane (48); the other end of the second connecting pipe (45) is connected and fixedly connected to the collection tank (36); and a second water pump (46) is installed on the second connecting pipe (45).

7. A low-pressure membrane production tailings recovery device according to claim 6, characterized in that: A temperature sensor (11) is fixedly connected to the top inner wall of the concentration tank (1), and a plurality of heating tubes (12) are fixedly connected to the side wall of the concentration tank (1) away from the main pipeline (23), and the heating tubes (12) are electrically connected to the temperature sensor (11).

8. A low-pressure membrane production tailings recovery device according to claim 7, characterized in that: A pressure pump (21) and a first butterfly valve (22) are installed on the main pipeline (23); the pressure pump (21) is arranged outside the concentration tank (1), and the first butterfly valve (22) is arranged inside the concentration tank (1).

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