A membrane pollution resistance detection device and method based on automatic flushing

Abstract

The present invention discloses a membrane pollution resistance performance detection device and method based on automatic flushing, which relates to the technical field of membrane pollution resistance performance detection, including a water tank, a connection bin is installed at one end of the water receiving pipe away from the first corrugated telescopic pipe, and a flushing cleaning part is installed on the connection bin. The present invention sets a flushing cleaning part, operates a controller to make the first cylinder contract to move the long strip of absorbent cotton to the top of the membrane, and at the same time, the second contact piece contacts the first contact piece to cause the solenoid valve to be in an open state and the motor to be in an energized state, so that it is sprayed out from the nozzle through the transition bin, and at the same time, the motor drives the transition bin to rotate through the rotating tube, so as to reduce the flushing dead angle. During the rotation of the transition bin, the long strip of absorbent cotton will also absorb part of the solution on the membrane, and then the membrane surface is flushed twice with deionized water, which reduces the labor intensity of the staff and improves the detection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of membrane pollution resistance performance detection, and in particular to a membrane pollution resistance performance detection device and method based on automatic flushing. Background Art

[0002] The pollution resistance of the sample is expressed by its desalination rate change rate and water flux change rate. The smaller the desalination rate change rate and water flux change rate after pollution, the better the pollution resistance of the membrane. The smaller the desalination rate change rate and water flux change rate after chemical cleaning, the better the recovery performance of the membrane after pollution.

[0003] When testing the pollution resistance of the membrane, it is necessary to test the pollution resistance of the membrane to multiple polluting liquids (sodium alginate test solution prepared with deionized water, mixed pollution test solution of calcium chloride and sodium bicarbonate prepared with deionized water, etc.). The multiple polluting liquids need to be contacted with the membrane one by one and tested. During the test, the cover of the booster pump port is buckled on the membrane surface, the booster pump is turned on, and it is stably operated for 180 minutes under constant pressure. The operating pressure is reduced to below 0.05MPa, and the booster pump is turned off. Then, the test membrane is cleaned with a cleaning liquid (deionized water or distilled water or sodium hydroxide solution or hydrochloric acid solution, etc.). However, since it is necessary to test the pollution resistance of the membrane to multiple polluting liquids, the membrane needs to be cleaned after each test, which will result in low detection efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a membrane pollution resistance detection device and method based on automatic flushing in order to solve the problem of low detection efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a membrane pollution resistance performance detection device based on automatic flushing, comprising a water tank, a controller installed on the water tank, a first corrugated telescopic tube connected to one side of the water tank, a water receiving pipe installed at the end of the first corrugated telescopic tube away from the water tank, an L-shaped connecting plate is arranged on the outside of the water receiving pipe, a positioning block is installed at one end of the L-shaped connecting plate, a position detection component is arranged on the positioning block, a placement plate is connected to the top of the positioning block through the position detection component, a connecting bin is installed at the end of the water receiving pipe away from the first corrugated telescopic tube, and a flushing and cleaning component is installed on the connecting bin.

[0006] As a further scheme of the present invention: the position detection part includes a second cylinder installed on the outer wall of the positioning block, the inner side of the positioning block is slidably connected to a movable frame, the output end of the second cylinder is connected to a connecting plate, the connecting plate is provided with a connecting rod extending to the inner side of the positioning block and connected to the bottom of the movable frame, the top of the movable frame is rotatably connected to the second oblique pressure rod via a rotating shaft, the top of the second oblique pressure rod is rotatably connected to a positioning frame located above the placement plate via a rotating shaft, the top of the movable frame is rotatably connected to the first oblique pressure rod located below the second oblique pressure rod and connected to the placement plate via a rotating shaft, a grid frame is installed on the inner side of the positioning frame, a pressure rod is movably inserted on the outer side of the positioning frame, a pressure plate is installed at the bottom end of the pressure rod, a connecting frame is installed at the top of the pressure rod, and a return spring connected to the positioning frame and located on the outside of the pressure rod is provided at the bottom of the connecting frame.

[0007] As a further solution of the present invention: the length and width of the inner wall of the connection frame are greater than the length and width of the outer wall of the grid frame.

[0008] As a further solution of the present invention: the number of the movable racks and the number of the second cylinders are both two, and the two movable racks and the two second cylinders are symmetrically arranged along the vertical center axis of the positioning block.

[0009] As a further solution of the present invention: the flushing cleaning component includes a motor installed on the top of the connecting bin, the interior of the connecting bin is connected to a rotating tube extending to the bottom of the connecting bin via a rotating sealing ring, the output end of the motor is connected to the top of the rotating tube, the bottom end of the rotating tube is installed with a transition bin, the bottom of the transition bin is installed with a plurality of nozzles installed side by side and equidistantly, the outer wall of the rotating tube is installed with a first annular plate located below the connecting bin, the outer side of the first annular plate is connected to a second annular plate via a rotating sealing ring, support frames located on both sides of the connecting bin are installed on the L-shaped connecting plate, a second corrugated telescopic tube is arranged on the support frame, a special-shaped tube connected to the second annular plate is installed at one end of the second corrugated telescopic tube, and both sides of the transition bin A rectangular bin connected to the first annular plate is installed, a T-shaped plug block extending to the bottom of the rectangular bin is inserted inside the rectangular bin, a long strip of absorbent cotton located below the rectangular bin is installed at the bottom of the T-shaped plug block, the outer wall of the rectangular bin is rotatably connected to pressure rollers located on both sides of the long strip of absorbent cotton through a rotating shaft, a limiting plate is installed on the outer wall of the water receiving pipe, a first cylinder connected to the limiting plate and located below the water receiving pipe is provided on the L-shaped connecting plate, a sleeve located above the water receiving pipe is installed on the top of the L-shaped connecting plate, a plug rod extending to the outside of the sleeve and connected to the limiting plate is inserted inside the sleeve, a second contact piece located on the inner side of the sleeve is installed at one end of the plug rod away from the limiting plate, and a first contact piece flush with the second contact piece is installed on the inner wall of the sleeve.

[0010] As a further solution of the present invention: the T-shaped plug block and the solenoid valve are electrically connected to the first contact piece through a wire, and the second contact piece is electrically connected to an external power supply through a wire.

[0011] As a further solution of the present invention: two pressing rollers are installed at the bottom of the rectangular bin, and the two pressing rollers are symmetrically arranged along the vertical center axis of the rectangular bin, and the distance between the two pressing rollers is less than the thickness of the long strip of absorbent cotton.

[0012] As a further solution of the present invention: the internal space of the second corrugated telescopic tube is equal to the internal space of the rectangular bin, and the farthest distance from the bottom of the T-shaped plug to the top of the placement plate is less than the moving distance of the T-shaped plug.

[0013] As a further solution of the present invention: the horizontal height of the connecting bin is greater than the horizontal height of the placement plate and less than the horizontal height of the positioning frame.

[0014] The present invention also discloses a method for detecting the pollution resistance of a membrane based on automatic flushing, which uses the above-mentioned device for detecting the pollution resistance of a membrane based on automatic flushing, and comprises the following steps:

[0015] S1: First calculate the initial average salt rejection rate and average water flux of the membrane sample, then spread the membrane to be tested on the top of the placement plate, and then use the position detection parts to locate the two sides of the membrane on the top of the placement plate;

[0016] S2: The membrane is divided into multiple detection areas by operating the position detection part, and then multiple contaminated liquids are poured into the corresponding detection areas. The cover of the external booster pump port is buckled on the membrane surface, and the booster pump is turned on. It runs stably for 180 minutes under constant pressure, and the operating pressure is reduced to below 0.05MPa. The booster pump is turned off, and then the top of the membrane is unblocked by operating the position detection part;

[0017] S3: Start the flushing cleaning part, and use the operation of the flushing cleaning part to flush the surface of the test membrane with the liquid in the water tank. It needs to be flushed twice: first, the membrane surface is flushed once with the cleaning liquid, and then the membrane surface is flushed twice with deionized water;

[0018] S4: After the flushing is completed, the membrane is partitioned again by operating the partition detection element, and then the average salt rejection rate and average water flux of the samples in each detection area are tested;

[0019] S5: Compare the changes in the desalination rate and water flux change rate before and after pollution.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By setting a flushing and cleaning part, the controller is operated to make the first cylinder contract to move the long absorbent cotton to the top of the membrane. At the same time, the second contact piece contacts the first contact piece, causing the solenoid valve to be in an open state and the motor to be in an energized state, so that the solution is sprayed out from the nozzle through the transition bin. At the same time, the motor drives the transition bin to rotate through the rotating tube, so as to reduce the flushing dead angle. During the rotation of the transition bin, the long absorbent cotton will also absorb part of the solution on the membrane, which reduces the labor intensity of the staff and improves the detection efficiency.

[0022] 2. By setting up the split detection parts, the two sides of the membrane are pressed and positioned by the pressure plate, and then the second cylinder is operated by operating the controller to make the movable frame pull the second oblique pressure rod, so that the positioning frame and the placement plate move toward each other under the action of the second oblique pressure rod, so that the bottom of the positioning frame presses the membrane on the top of the placement plate. At this time, the membrane range on the top of the placement plate can be divided into multiple areas through the grid frame, and then different contaminated liquids are poured into different squares on the inside of the grid frame. In this process, the grid frame is used to prevent multiple contaminated liquids from contacting each other, so that multiple contaminated liquids can contact with the membrane. In this way, the effects of multiple contaminated liquids on the membrane can be detected at one time, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the connection between the placement plate and the positioning frame of the present invention;

[0025] Figure 3 It is a schematic diagram of the connection between the positioning block and the second cylinder of the present invention;

[0026] Figure 4 It is a schematic diagram of the connection between the water receiving pipe and the L-shaped connecting plate of the present invention;

[0027] Figure 5 It is a schematic diagram of the internal structure of the casing of the present invention;

[0028] Figure 6 It is a schematic diagram of the connection between the connecting bin and the transition bin of the present invention;

[0029] Figure 7 It is a schematic diagram of the internal structure of the second annular plate and the rectangular bin of the present invention;

[0030] Figure 8 It is a schematic diagram of the connection between the support frame and the rectangular bin of the present invention.

[0031] In the figure: 1, water tank; 2, controller; 3, first bellows telescopic pipe; 4, water connection pipe; 5, solenoid valve; 6, connection chamber; 701, limit plate; 702, first cylinder; 703, L-shaped connection plate; 704, plug rod; 705, sleeve; 706, movable frame; 707, placement plate; 708, pressure plate; 709, pressure rod; 710, positioning frame; 711, connection frame; 712, positioning block; 713, first oblique pressure rod; 714, second oblique pressure rod; 715, grid frame Frame; 716, return spring; 717, connecting rod; 718, connecting plate; 719, second cylinder; 720, support frame; 721, second corrugated telescopic tube; 722, special-shaped tube; 723, motor; 724, transition bin; 725, rotating tube; 726, first annular plate; 727, second annular plate; 728, rectangular bin; 729, nozzle; 730, long absorbent cotton; 731, pressure roller; 732, T-type plug; 733, first contact piece; 734, second contact piece. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0034] See also Figures 1 to 8In an embodiment of the present invention, a membrane pollution resistance performance detection device based on automatic flushing includes a water tank 1, a controller 2 is installed on the water tank 1, a first corrugated telescopic tube 3 is connected to one side of the water tank 1, a water receiving pipe 4 is installed at the end of the first corrugated telescopic tube 3 away from the water tank 1, an L-shaped connecting plate 703 is arranged on the outside of the water receiving pipe 4, a positioning block 712 is installed at one end of the L-shaped connecting plate 703, a position detection component is arranged on the positioning block 712, a placement plate 707 is connected to the top of the positioning block 712 through the position detection component, a connecting bin 6 is installed at the end of the water receiving pipe 4 away from the first corrugated telescopic tube 3, and a flushing and cleaning component is installed on the connecting bin 6.

[0035] In this embodiment: first calculate the initial average desalination rate and average water flux of the membrane sample, then spread the membrane to be tested on the top of the placement plate 707, then use the position detection component to position the two sides of the membrane on the top of the placement plate 707, and operate the position detection component to divide the membrane into multiple detection areas, then pour a variety of contaminated liquids into the corresponding detection areas, buckle the cover of the external booster pump port on the membrane surface, start the booster pump, and run it stably at a constant pressure for 180 minutes, reduce the operating pressure to below 0.05MPa, turn off the booster pump, and then operate the position detection component to remove the cover on the top of the membrane, start the flushing and cleaning component, and then The operation of the flushing and cleaning component allows the cleaning liquid in the water tank 1 to flush the surface of the test membrane. After the flushing is completed, the membrane is partitioned again by operating the position detection component, and then the average desalination rate and average water flux of the samples in each detection area are tested to calculate the desalination rate change rate and water flux change rate of the polluted membrane; the changes in the desalination rate change rate and water flux change rate before and after pollution are compared. The smaller the desalination rate change rate and water flux change rate after pollution, the better the pollution resistance of the membrane, and the smaller the desalination rate change rate and water flux change rate after pollution chemical cleaning, the better the recovery performance of the membrane after pollution.

[0036] Please refer to Figure 1 , Figure 2 , Figure 3The position detection member includes a second cylinder 719 installed on the outer wall of the positioning block 712, the inner side of the positioning block 712 is slidably connected to the movable frame 706, the output end of the second cylinder 719 is connected to a connecting plate 718, and the connecting plate 718 is provided with a connecting rod 717 extending to the inner side of the positioning block 712 and connected to the bottom of the movable frame 706, the top of the movable frame 706 is rotatably connected to the second oblique pressure rod 714 through the rotating shaft, and the top of the second oblique pressure rod 714 is rotatably connected to the positioning rod 717 located above the placement plate 707 through the rotating shaft. Frame 710, the top of the movable frame 706 is rotatably connected to the first inclined pressure rod 713 located below the second inclined pressure rod 714 and connected to the placement plate 707 through a rotating shaft, a grid frame 715 is installed on the inner side of the positioning frame 710, a pressure rod 709 is movably inserted on the outer side of the positioning frame 710, a pressure plate 708 is installed on the bottom end of the pressure rod 709, a connecting frame 711 is installed on the top end of the pressure rod 709, and a return spring 716 connected to the positioning frame 710 and located on the outside of the pressure rod 709 is provided at the bottom of the connecting frame 711.

[0037] When the second cylinder 719 is extended, the movable frame 706 is driven by the connecting plate 718 to move in the direction away from the placement plate 707, so that the movable frame 706 pulls the second oblique pressure rod 714, so that the positioning frame 710 and the placement plate 707 move toward each other under the action of the second oblique pressure rod 714, so that the bottom of the positioning frame 710 presses the membrane on the top of the placement plate 707, and then the second cylinder 719 is operated to operate the second cylinder 719. Through the grid frame 715, the membrane range on the top of the placement plate 707 can be placed in multiple areas, and then different contaminated liquids are poured into different squares on the inside of the grid frame 715. In this process, the grid frame 715 is used to prevent multiple contaminated liquids from contacting each other, so that multiple contaminated liquids can contact with the membrane. In this way, the effects of multiple contaminated liquids on the membrane can be detected at one time, thereby improving the detection efficiency. The cover of the external booster pump port is buckled on the top of the grid frame 715, and the booster pump is turned on. It runs stably under constant pressure for 180 minutes, and the operating pressure is reduced to below 0.05MPa. The booster pump is turned off, and the second cylinder 719 is contracted by operating the controller 2 to separate the positioning frame 710 and the grid frame 715 from the membrane. Then, the surface of the membrane is rinsed by the flushing cleaning piece. After the flushing of the membrane surface is completed, the connecting frame 711 is pulled to separate the pressure plate 708 from the membrane.

[0038] Please refer to Figure 1 , Figure 2The length and width of the inner wall of the connecting frame 711 are greater than the length and width of the outer wall of the grid frame 715. This structure is set to prevent the connecting frame 711 from blocking the grid frame 715, thereby improving the smoothness of pouring the contaminated liquid into the inner side of the grid frame 715.

[0039] Please refer to Figure 3 There are two movable frames 706 and two second cylinders 719, and the two movable frames 706 and the second cylinders 719 are symmetrically arranged along the vertical center axis of the positioning block 712. By setting this structure, when the second cylinder 719 is extended, the two movable frames 706 inside the positioning block 712 move in different directions, so that the placement plate 707 and the positioning frame 710 can only move in the vertical direction.

[0040] Please refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The flushing and cleaning part includes a motor 723 installed on the top of the connecting bin 6, and the interior of the connecting bin 6 is connected to a rotating tube 725 extending to the bottom of the connecting bin 6 through a rotating sealing ring, the output end of the motor 723 is connected to the top of the rotating tube 725, and a transition bin 724 is installed at the bottom of the rotating tube 725, and a plurality of nozzles 729 are installed side by side and equidistantly at the bottom of the transition bin 724, and a first annular plate 726 located below the connecting bin 6 is installed on the outer wall of the rotating tube 725, and a second annular plate 727 is connected to the outer side of the first annular plate 726 through a rotating sealing ring, and a support frame 720 located on both sides of the connecting bin 6 is installed on the L-shaped connecting plate 703, and a second corrugated telescopic tube 721 is arranged on the support frame 720, and a special-shaped tube 722 connected to the second annular plate 727 is installed at one end of the second corrugated telescopic tube 721, and rectangular bins connected to the first annular plate 726 are installed on both sides of the transition bin 724. 728, a T-shaped plug 732 extending to the bottom of the rectangular bin 728 is inserted into the interior of the rectangular bin 728, a long strip of absorbent cotton 730 located below the rectangular bin 728 is installed at the bottom of the T-shaped plug 732, and the outer wall of the rectangular bin 728 is rotatably connected to the pressure rollers 731 located on both sides of the long strip of absorbent cotton 730 through a rotating shaft, and a limit plate 701 is installed on the outer wall of the water receiving pipe 4, and a limit plate 701 is connected to the limit plate 701 and is located at the receiving pipe 4. The first cylinder 702 is below the water pipe 4, and the top of the L-shaped connecting plate 703 is equipped with a sleeve 705 located above the water receiving pipe 4. The interior of the sleeve 705 is plugged with an insertion rod 704 extending to the outside of the sleeve 705 and connected to the limit plate 701. The end of the insertion rod 704 away from the limit plate 701 is equipped with a second contact piece 734 located on the inner side of the sleeve 705, and the inner wall of the sleeve 705 is equipped with a first contact piece 733 flush with the second contact piece 734.

[0041] In this embodiment: when flushing the membrane surface, the first cylinder 702 is first contracted by operating the controller 2. When the first cylinder 702 is contracted, the water receiving pipe 4 can be driven to move toward the placement plate 707 through the limit plate 701, so that the connecting bin 6 is moved above the placement plate 707. In this process, the top of the special-shaped tube 722 will squeeze the second corrugated telescopic tube 721, so that the aqueous solution inside the second corrugated telescopic tube 721 passes through the special-shaped tube 722, the second annular plate 727, and the first annular plate 726 into the rectangular bin 728. At this time, the aqueous solution entering the rectangular bin 728 will push the T-shaped plug 732 to move downward, so that the long absorbent cotton 730 is moved above the membrane, so that the long absorbent cotton 730 is close to the membrane surface but does not contact the membrane. At the same time, the second contact piece 734 contacts the first contact piece 733, causing the solenoid valve 5 to be in an open state. The motor 723 is in the energized operating state. At this time, the aqueous solution inside the water tank 1 will enter the connecting chamber 6, and then be sprayed out by the nozzle 729 through the transition chamber 724. At the same time, the motor 723 drives the transition chamber 724 to rotate through the rotating tube 725 to reduce the dead angle of flushing. During the rotation of the transition chamber 724, the long absorbent cotton 730 will also absorb the surface solution of the membrane to reduce the amount of solution on the membrane surface, thereby improving the drying efficiency of the membrane. After the flushing is completed, the transition chamber 724 is moved to the initial position by extending the first cylinder 702. At this time, the aqueous solution inside the rectangular chamber 728 enters the second corrugated telescopic tube 721 under the action of negative pressure. At this time, the T-shaped plug 732 drives the long absorbent cotton 730 to rise. In this process, the long absorbent cotton 730 is squeezed by the pressing roller 731 to squeeze and discharge the sewage in the pressing roller 731 for subsequent use.

[0042] Please refer to Figure 5 The T-shaped plug 732 and the solenoid valve 5 are electrically connected to the first contact piece 733 through a wire, and the second contact piece 734 is electrically connected to the external power supply through a wire. By setting this structure, when the second contact piece 734 contacts the first contact piece 733, the motor 723 is energized to operate, and the solenoid valve 5 is energized to open, thereby controlling the operating timing of the motor 723 and the solenoid valve 5.

[0043] Please refer to Figure 6 , Figure 7 Two pressing rollers 731 are installed at the bottom of the rectangular bin 728, and the two pressing rollers 731 are symmetrically arranged along the vertical center axis of the rectangular bin 728. The distance between the two pressing rollers 731 is smaller than the thickness of the long absorbent cotton 730. By setting this structure, the pressing rollers 731 can squeeze the long absorbent cotton 730 when the long absorbent cotton 730 moves upward.

[0044] Please refer to Figure 1 , Figure 6 , Figure 8The internal space of the second corrugated expansion tube 721 is equal to the internal space of the rectangular bin 728. By setting this structure, when the T-shaped plug 732 is extended, the long absorbent cotton 730 moves down to the top of the membrane, so that the long absorbent cotton 730 can absorb some of the droplets in a spherical state on the surface of the membrane.

[0045] Please refer to Figure 1 , Figure 2 , the horizontal height of the connecting compartment 6 is greater than the horizontal height of the placing plate 707 and less than the horizontal height of the positioning frame 710.

[0046] In this embodiment: by providing this structure, the connection chamber 6 is positioned between the positioning frame 710 and the placement plate 707 when it moves, so as to prevent the positioning frame 710 from blocking the sprayed aqueous solution.

[0047] In combination with the above-mentioned membrane pollution resistance detection device based on automatic flushing, a membrane pollution resistance detection method based on automatic flushing is provided, which specifically includes the following steps:

[0048] S1: First calculate the initial average desalination rate and average water flux of the membrane sample, then spread the membrane to be tested on the top of the placement plate 707, pull the connection frame 711 to separate the pressure plate 708 from the top of the placement plate 707, then lay the membrane to be tested on the top of the placement plate 707, and then release the connection frame 711. At this time, the connection frame 711 will be restored under the elastic restoring force of the reset spring 716, so that the pressure plate 708 presses and positions the two sides of the membrane;

[0049] S2: Then, the second cylinder 719 is operated by operating the controller 2. When the second cylinder 719 is extended, the connecting plate 718 and the connecting plate 718 drive the movable frame 706 to move away from the placement plate 707, so that the movable frame 706 pulls the second oblique pressure rod 714, so that the positioning frame 710 and the placement plate 707 move toward each other under the action of the second oblique pressure rod 714, so that the bottom of the positioning frame 710 presses the membrane on the top of the placement plate 707. At this time, the membrane range of the top of the placement plate 707 can be multiple areas through the grid frame 715, and then different dirt can be placed. The dye solution is poured into different squares inside the grid frame 715. In this process, the grid frame 715 is used to prevent the contact between multiple contaminating liquids, so that multiple contaminating liquids can contact the membrane. In this way, the effects of multiple contaminating liquids on the membrane can be detected at one time, thereby improving the detection efficiency. The cover of the external booster pump port is buckled on the top of the grid frame 715, and the booster pump is turned on. It runs stably for 180 minutes under constant pressure, and the operating pressure is reduced to below 0.05MPa. The booster pump is turned off, and the second cylinder 719 is contracted by operating the controller 2, so as to separate the positioning frame 710 and the grid frame 715 from the membrane;

[0050] S3: By operating the controller 2 to shrink the first cylinder 702, when the first cylinder 702 shrinks, the water receiving pipe 4 can be driven to move toward the placement plate 707 through the limit plate 701, so that the connecting bin 6 is moved above the placement plate 707. In this process, the top of the special-shaped tube 722 squeezes the second corrugated telescopic tube 721, so that the aqueous solution inside the second corrugated telescopic tube 721 passes through the special-shaped tube 722, the second annular plate 727, and the first annular plate 726 into the rectangular bin 728. At this time, the aqueous solution entering the rectangular bin 728 will push the T-shaped plug 732 to move downward, so as to The long absorbent cotton 730 is moved to the top of the membrane and has a certain distance from the membrane. At the same time, the second contact piece 734 contacts the first contact piece 733, causing the electromagnetic valve 5 to be in an open state and the motor 723 to be in an energized state. At this time, the solution inside the water tank 1 will enter the connecting chamber 6, and then be sprayed out by the nozzle 729 through the transition chamber 724. At the same time, the motor 723 drives the transition chamber 724 to rotate through the rotating tube 725, so as to reduce the flushing dead angle. During the rotation of the transition chamber 724, the long absorbent cotton 730 will also absorb part of the solution on the surface of the membrane, and then the membrane surface is rinsed twice with deionized water.

[0051] S4: After the flushing is completed, the transition chamber 724 is moved to the initial position by extending the first cylinder 702. At this time, the aqueous solution inside the rectangular chamber 728 enters the second bellows telescopic tube 721 under the action of negative pressure. At this time, the T-shaped plug 732 drives the long absorbent cotton 730 to rise. In this process, the long absorbent cotton 730 is squeezed by the pressing roller 731 to squeeze out the sewage in the pressing roller 731 for subsequent use. After that, the sample membrane is dried, and the membrane is partitioned again by operating the position detection component. After that, the average desalination rate and average water flux of the samples in each detection area are tested;

[0052] S5: Compare the changes in the desalination rate and water flux change rate before and after pollution.

[0053] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A membrane pollution resistance detection device based on automatic flushing, comprising a water tank (1), characterized in that: The water tank (1) is provided with a controller (2); one side of the water tank (1) is connected to a first bellows telescopic tube (3); an end of the first bellows telescopic tube (3) away from the water tank (1) is provided with a water receiving pipe (4); an L-shaped connecting plate (703) is provided on the outside of the water receiving pipe (4); a positioning block (712) is provided on one end of the L-shaped connecting plate (703); a position detection member is provided on the positioning block (712); and a position detection member is provided on the top of the positioning block (712). The detection component is connected to a placement plate (707); a connection chamber (6) is installed at one end of the water receiving pipe (4) away from the first corrugated telescopic pipe (3); a flushing cleaning component is installed on the connection chamber (6); the position detection component comprises a second cylinder (719) installed on the outer wall of the positioning block (712); a movable frame (706) is slidably connected to the inner side of the positioning block (712); an output end of the second cylinder (719) is connected to a connecting plate (718); and a flushing cleaning component is installed on the connecting plate (718). A connecting rod (717) is provided which extends to the inner side of the positioning block (712) and is connected to the bottom of the movable frame (706); the top of the movable frame (706) is rotatably connected to a second oblique pressure rod (714) via a rotating shaft; the top of the second oblique pressure rod (714) is rotatably connected to a positioning frame (710) located above the placement plate (707) via a rotating shaft; the top of the movable frame (706) is rotatably connected to a positioning frame (710) located below the second oblique pressure rod (714) and connected to the placement plate (707) via a rotating shaft. ), a first oblique pressure rod (713) connected to the positioning frame (710), a grid frame (715) is installed on the inner side of the positioning frame (710), a pressure rod (709) is movably inserted on the outer side of the positioning frame (710), a pressure plate (708) is installed on the bottom end of the pressure rod (709), a connecting frame (711) is installed on the top end of the pressure rod (709), and a return spring (716) connected to the positioning frame (710) and located on the outer side of the pressure rod (709) is provided at the bottom of the connecting frame (711);The flushing and cleaning component comprises a motor (723) mounted on the top of the connecting bin (6); the interior of the connecting bin (6) is connected to a rotating tube (725) extending to the bottom of the connecting bin (6) via a rotating sealing ring; the output end of the motor (723) is connected to the top of the rotating tube (725); a transition bin (724) is mounted on the bottom of the rotating tube (725); a plurality of nozzles (729) are mounted side by side and at equal distances at the bottom of the transition bin (724); and a first annular nozzle (729) is mounted on the outer wall of the rotating tube (725) below the connecting bin (6). The first annular plate (726) is connected to a second annular plate (727) on its outer side via a rotating sealing ring; a support frame (720) located on both sides of the connecting bin (6) is installed on the L-shaped connecting plate (703); a second corrugated telescopic tube (721) is provided on the support frame (720); a special-shaped tube (722) connected to the second annular plate (727) is installed at one end of the second corrugated telescopic tube (721); and rectangular bins (722) connected to the first annular plate (726) are installed on both sides of the transition bin (724). 8), a T-shaped plug (732) extending to the bottom of the rectangular bin (728) is inserted into the interior of the rectangular bin (728), a long strip of absorbent cotton (730) located below the rectangular bin (728) is installed at the bottom of the T-shaped plug (732), the outer wall of the rectangular bin (728) is rotatably connected to pressure rollers (731) located on both sides of the long strip of absorbent cotton (730) via a rotating shaft, a limiting plate (701) is installed on the outer wall of the water receiving pipe (4), and a connecting plate (703) connected to the limiting plate (701) and located on the water receiving pipe is provided on the L-shaped connecting plate (703). (4) a first cylinder (702) below, a sleeve (705) located above the water receiving pipe (4) is installed on the top of the L-shaped connecting plate (703), a plug rod (704) extending to the outside of the sleeve (705) and connected to the limit plate (701) is inserted inside the sleeve (705), a second contact piece (734) located inside the sleeve (705) is installed at one end of the plug rod (704) away from the limit plate (701), and a first contact piece (733) flush with the second contact piece (734) is installed on the inner wall of the sleeve (705). ; 2. The membrane pollution resistance detection device based on automatic flushing according to claim 1 is characterized in that: The length and width of the inner wall of the connection frame (711) are both greater than the length and width of the outer wall of the grid frame (715).

3. The membrane pollution resistance detection device based on automatic flushing according to claim 2 is characterized in that: The number of the movable frames (706) and the second cylinders (719) is two, and the two movable frames (706) and the second cylinders (719) are symmetrically arranged along the vertical center axis of the positioning block (712).

4. The membrane pollution resistance detection device based on automatic flushing according to claim 3 is characterized in that: The T-shaped plug (732) and the solenoid valve (5) are both electrically connected to the first contact piece (733) via a wire, and the second contact piece (734) is electrically connected to an external power source via a wire.

5. The membrane pollution resistance detection device based on automatic flushing according to claim 4 is characterized in that: Two pressing rollers (731) are installed at the bottom of the rectangular bin (728), and the two pressing rollers (731) are symmetrically arranged along the vertical center axis of the rectangular bin (728), and the distance between the two pressing rollers (731) is less than the thickness of the long strip of absorbent cotton (730).

6. The membrane pollution resistance detection device based on automatic flushing according to claim 5 is characterized in that: The internal space of the second corrugated telescopic tube (721) is equal to the internal space of the rectangular bin (728), and the maximum distance from the bottom of the T-shaped plug block (732) to the top of the placement plate (707) is less than the moving distance of the T-shaped plug block (732).

7. The membrane pollution resistance detection device based on automatic flushing according to claim 6 is characterized in that: The horizontal height of the connection chamber (6) is greater than the horizontal height of the placement plate (707) and less than the horizontal height of the positioning frame (710).

8. A method for detecting membrane pollution resistance based on automatic flushing, characterized in that: The membrane pollution resistance detection device based on automatic flushing according to any one of claims 1 to 7 comprises the following steps: S1: First, the initial average salt rejection rate and average water flux of the membrane sample are calculated, and then the membrane to be tested is spread on the top of the placement plate (707), and then the two sides of the membrane on the top of the placement plate (707) are positioned by the position detection component; S2: The membrane is divided into multiple detection areas by operating the position detection part, and then multiple contaminated liquids are poured into the corresponding detection areas. The cover of the external booster pump port is buckled on the membrane surface, and the booster pump is turned on. It runs stably for 180 minutes under constant pressure, and the operating pressure is reduced to below 0.05MPa. The booster pump is turned off, and then the top of the membrane is unblocked by operating the position detection part; S3: starting the flushing cleaning component, and operating the flushing cleaning component to flush the membrane surface with the liquid in the water tank (1). The membrane surface needs to be flushed twice, firstly with the cleaning liquid, and then with deionized water; S4: After the flushing is completed, the membrane is partitioned again by operating the partition detection element, and then the average salt rejection rate and average water flux of the samples in each detection area are tested; S5: Compare the changes in the desalination rate and water flux change rate before and after pollution.

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