Permanent magnet processing waste liquid treatment device capable of self-cleaning filter screen

Abstract

The present invention relates to the field of permanent magnet processing technology, and in particular to a permanent magnet processing waste liquid treatment device capable of self-cleaning a filter screen. The present invention adopts a switching pipeline design, adds a booster cylinder, and sets a sealing plate based on magnetic adsorption at the inlet of a backwashing pipe. The filtered waste liquid causes the piston plate to move down first and drives the tension spring to stretch. When the piston plate moves to a critical position, the pull rope pulls the sealing plate to open the backwashing pipe. In this way, while the booster cylinder is filled with water at one end, the piston plate is moved up based on the action of the tension spring and another driving force is formed on the liquid, thereby increasing the water pressure of the waste liquid discharged from the backwashing pipe and enhancing the backwashing effect on the filter screen.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet processing, in particular to a permanent magnet processing waste liquid treatment device capable of self-cleaning a filter screen. Background Art

[0002] In the field of permanent magnet production, the surface of the sintered permanent magnet products is uneven and has poor finish, and needs to be polished on a water-based grinder. In the prior art, the wastewater flowing out of the grinder needs to be discharged into a wastewater pool for further treatment before it can be discharged. In this regard, our company has applied for an invention patent - "A wastewater treatment device after permanent magnet polishing" (application number CN201910466474.8) discloses a wastewater treatment device after permanent magnet polishing, which is used to recycle and reuse the residual residue in the wastewater after permanent magnet polishing.

[0003] However, when our company used this device, although it could improve the efficiency of wastewater filtration and purification, due to the large amount of wastewater, the purification components such as the steady flow filter plate would accumulate impurities and cause blockage after a certain period of time, which would reduce the filtration and purification efficiency. Since the existing structure does not have a convenient design for removing the purification components, maintenance personnel need to shut down the device and disassemble it, which is quite troublesome.

[0004] Therefore, our company considered using backwashing measures to clean the filter. After redesign, it was found that if a switching structure was used to divert wastewater to the other side of the filter for backwashing, due to the low wastewater flow rate, the water flow impact force would be insufficient, resulting in poor backwashing effect. Summary of the invention

[0005] Based on this, it is necessary to provide a permanent magnet processing waste liquid treatment device that can self-clean the filter screen to address the problem that the existing switching design has insufficient water flow impact force and poor backwashing effect.

[0006] The present invention is implemented by the following technical solutions:

[0007] In a first aspect, the present invention discloses a permanent magnet processing waste liquid treatment device capable of self-cleaning a filter screen, comprising a liquid inlet bin, a filter bin, a switching component, a booster cylinder, and a booster component.

[0008] The top of the liquid inlet bin is connected with a waste liquid inlet pipe for introducing waste liquid from permanent magnet processing. The bottom of the liquid inlet bin is provided with outlet 1 and outlet 2, outlet 1 is connected with liquid guide tube 1, and outlet 2 is connected with liquid guide tube 2. Liquid guide tube 2 is provided with filter screen 2, and the bottom of liquid guide tube 2 is connected with drain pipe 2 on the side corresponding to filter screen 2 close to the liquid inlet bin, and valve 2 is provided on drain pipe 2.

[0009] One transverse end of the filter bin is connected to the first liquid guide pipe, and the other transverse end is connected to the liquid outlet pipe. A filter screen is arranged in the filter bin. A drain pipe is connected to the bottom of the first liquid guide pipe, and a drain pipe is connected to the side of the second liquid guide pipe at the bottom of the first liquid guide pipe that is opposite to the liquid outlet pipe, and a valve is arranged on the drain pipe.

[0010] The switching component is used to switch the connection between the liquid inlet tank and the liquid guide tube 1 or the liquid guide tube 2. The switching component is also connected to the valve 1 and the valve 2 for synchronously switching the switch state of the valve 1 and the valve 2, and matching the connection state of the liquid inlet tank.

[0011] The booster cylinder is connected to the top of the filter bin. The top of the booster cylinder is connected to the second liquid guide tube. The top of the booster cylinder is also connected to a backwashing pipe. The backwashing pipe extends into the filter bin and is used to backwash the filter screen.

[0012] The boosting assembly is arranged in the boosting cylinder, and is used to boost the backwashing pipe when the liquid inlet bin is connected to the second liquid guide pipe. The boosting assembly includes a sealing plate, a piston plate, a pull rope, and a support rod. Among them, the sealing plate is used to flexibly block the backwashing pipe. A magnetic ring is arranged at the inner top of the boosting cylinder corresponding to the inlet of the backwashing pipe, which is used to magnetically adsorb the sealing plate. A longitudinal slide rail is arranged on the inner wall of the boosting cylinder, and the slide rail is located above the piston plate, and a limit block is arranged at the bottom end thereof. A slider is arranged on the slide rail, and the slider is connected to the sealing plate. The piston plate is connected to the inner top of the boosting cylinder through a tension spring, and is used to move up and down in the boosting cylinder under the action of hydraulic pressure and tension spring. One end of the pull rope is connected to the sealing plate, and the other end is connected to the piston plate, and is used to pull the sealing plate away from the magnetic ring when the liquid above the piston plate increases to a critical value. The support rod is used to lift the sealing plate when the tension spring is reset, and to make the sealing plate adsorbed by the magnetic ring.

[0013] The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen is implemented according to the method or process of an embodiment of the present disclosure.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention adopts a switching pipeline design, adds a booster cylinder, and sets a sealing plate based on magnetic adsorption at the inlet of the backwash pipe. The filtered waste liquid causes the piston plate to move down first and drives the tension spring to stretch. When the piston plate moves to the critical position, the pull rope pulls the sealing plate to open the backwash pipe. In this way, while the booster cylinder is filled with water at one end, the piston plate is moved up based on the action of the tension spring and forms another driving force for the liquid, thereby increasing the water pressure of the waste liquid discharged from the backwash pipe and enhancing the backwashing effect on the filter screen.

[0016] 2. The present invention adopts a transmission design to match the valves of the two drainage pipes with the connection state of the liquid inlet bin, ensuring the smooth discharge of waste liquid after being filtered by the filter screen 1, and the smooth discharge of impurities when the filter screen 1 is backwashed, and reducing the work intensity of maintenance personnel.

[0017] 3. The present invention also connects a scraper plate through a moving rod under the piston plate, so that when the piston plate moves downward, it also drives the scraper plate to scrape and clean the filter screen 1 from top to bottom, and scrapes the impurities on the filter screen 1 to the lower part, so as to cooperate with the flushing of the backwash pipe to further ensure the backwashing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen of the present invention;

[0019] Figure 2 for Figure 1 Internal workstation diagram of the permanent magnet processing waste liquid treatment device when filtering waste liquid;

[0020] Figure 3 for Figure 2 The structural diagram of the switching dial in the figure;

[0021] Figure 4 for Figure 2 A magnified view of the mid-boost assembly;

[0022] Figure 5 for Figure 1 The workstation diagram of the permanent magnet processing waste liquid treatment device in the backwashing stage 1;

[0023] Figure 6 for Figure 1 The workstation diagram of the permanent magnet processing waste liquid treatment device in the backwashing stage 2;

[0024] Figure 7 for Figure 6 Middle partial enlarged picture;

[0025] Figure 8 for Figure 1 The workstation diagram of the permanent magnet processing waste liquid treatment device in the backwash stage three;

[0026] Fig. 9 for Figure 8 A partial enlarged view of .

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 100, liquid inlet tank, 101, waste liquid inlet pipe, 102, liquid guide pipe 1, 103, liquid guide pipe 2, 104, filter tank, 105, liquid outlet pipe, 106, filter screen 1, 107, liquid discharge pipe 1, 108, valve 1, 109, filter screen 2, 110, liquid discharge pipe 2, 111, valve 2, 200, drive motor, 201, driving shaft, 202, switching turntable, 203, liquid through hole, 30 1. Worm one, 302. Worm wheel one, 303. Worm two, 304. Worm wheel two, 400. Booster cylinder, 401. Backwash pipe, 402. Piston plate, 403. Tension spring, 404. Pull rope, 405. Support rod, 406. Sealing plate, 407. Magnetic ring, 408. Sliding block, 409. Slide rail, 410. Limit block, 501. Moving rod, 502. Scraper, 600. Pressure sensor. DETAILED DESCRIPTION

[0029] 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.

[0030] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0032] Please see Figure 1 , is a structural diagram of a permanent magnet processing waste liquid treatment device capable of self-cleaning a filter screen in this embodiment. This embodiment discloses a permanent magnet processing waste liquid treatment device capable of self-cleaning a filter screen, comprising: a liquid inlet bin 100, a filter bin 104, a switching component, a booster cylinder 400, and a booster component.

[0033] The top of the liquid inlet tank 100 is connected to a waste liquid inlet pipe 101 for introducing waste liquid from permanent magnet processing. Figure 2The bottom of the liquid inlet bin 100 is provided with an outlet 1 and an outlet 2, the outlet 1 is connected to a liquid guide tube 102, and the outlet 2 is connected to a liquid guide tube 2 103. The liquid guide tube 2 103 is equipped with a filter screen 2 109, and the bottom of the liquid guide tube 2 103 is connected to a drain pipe 2 110 corresponding to the filter screen 2 109 near the liquid inlet bin 100, and the drain pipe 2 110 is equipped with a valve 2 111.

[0034] In this embodiment, the liquid inlet bin 100 is designed as a hollow cylindrical cavity. The distances from the center of outlet 1 and the center of outlet 2 to the center of the bottom circle of the liquid inlet bin 100 are the same, that is, outlet 1 and outlet 2 are circumferentially distributed at the bottom of the liquid inlet bin 100, which is convenient for subsequent connection and switching.

[0035] One lateral end of the filter chamber 104 is connected to the liquid guide tube 102, and the other lateral end is connected to the liquid outlet pipe 105. A filter screen 106 is installed in the filter chamber 104. A drain pipe 107 is connected to the bottom of the liquid guide tube 102. The side of the bottom of the liquid guide tube 102 corresponding to the filter screen 2 109 facing away from the liquid outlet pipe 105 is connected to the drain pipe 107, and a valve 108 is installed on the drain pipe 107.

[0036] The switching assembly is used to switch the liquid inlet tank 100 to be connected with the liquid guide tube 1 102 or the liquid guide tube 2 103 .

[0037] like Figure 2 As shown, the switching assembly includes a driving motor 200, a driving shaft 201, and a switching turntable 202. The driving motor 200 is fixed to the outer top of the liquid inlet bin 100. The driving shaft 201 is rotatably installed in the liquid inlet bin 100 and is coaxially arranged with the liquid inlet bin 100. The top end of the driving shaft 201 extends out of the liquid inlet bin 100 and is connected to the output end of the driving motor 200. The switching turntable 202 is arranged close to the inner bottom of the liquid inlet bin 100 and is coaxially connected with the driving shaft 201. Figure 3 A liquid hole 203 is opened on the switching turntable 202, and the liquid hole 203 corresponds to the outlet 1 or the outlet 2.

[0038] In this way, the driving motor 200 drives the driving shaft 201 to rotate the switching disc 202, and the liquid hole 203 rotates together with the switching disc 202. When it rotates to above the first outlet, the liquid inlet tank 100 is connected with the liquid guide tube 102, and the waste liquid flows into the filter tank 104 through the liquid guide tube 102; when it rotates to above the second outlet, the liquid inlet tank 100 is connected with the liquid guide tube 102.

[0039] The switching component is also in transmission connection with valve 1 108 and valve 2 111 for synchronously switching the switch states of valve 1 108 and valve 2 111 and matching the connection state of the liquid inlet tank 100 .

[0040] like Figure 2As shown, the driving shaft 201 extends out of the bottom of the liquid tank 100, and a worm 1 301 and a worm 2 303 are arranged at intervals. The valve stem of the valve 108 is arranged facing the driving shaft 201, and is equipped with a worm wheel 1 302 meshing with the worm 1 301. The valve stem of the valve 2 111 is also arranged facing the driving shaft 201, and is equipped with a worm wheel 2 304 meshing with the worm 2 303. In this way, when the driving shaft 201 is driven by the driving motor 200 to rotate, the worm 1 301 and the worm 2 303 rotate synchronously, thereby driving the valve stems of the valve 1 108 and the valve 2 111 to rotate, and the states of the two valves are adjusted synchronously.

[0041] In this embodiment, valve 1 108 and valve 2 111 are existing ball valves, which are rotated 90° to connect the inlet and outlet of the ball with the pipe port, thus opening; and reversed 90° to make the ball face the pipe port, thus cutting off the flow and closing. Of course, other types of valves can also be used, but they should be able to open and close when the valve stem is rotated forward or reversely.

[0042] See also Figure 2 , which is the daily work station (i.e., filtering and discharging the wastewater). This station corresponds to switching to the connection between the liquid inlet tank 100 and the liquid guide tube 102, the valve 108 is turned to the closed state, and the valve 2 111 is turned to the open state. In this way, the waste liquid enters the filter tank 104 through the waste liquid inlet pipe 101, the liquid inlet tank 100, and the liquid guide tube 102. Since the valve 108 is closed at this time, the waste liquid is filtered through the filter screen 106 and discharged from the liquid outlet pipe 105.

[0043] After working at the daily workstation for a period of time, the filter screen 106 will be clogged, which is manifested by the increase of pressure in the filter chamber 104 and the decrease of flow rate in the liquid outlet pipe 105. Therefore, a filter screen status monitor can be installed to monitor the status of the filter screen. For example, a pressure sensor is used to install the pressure sensor in the filter chamber 104 and on the side of the filter screen 106 facing the liquid guide pipe 102 to monitor the pressure in the filter chamber 104. It is also possible to install a flow meter on the liquid outlet pipe 105 to monitor the liquid outlet flow rate. When the pressure in the chamber is too high or the liquid outlet flow rate is too small, it means that the filter screen 106 is clogged and needs to be backwashed.

[0044] The boost cylinder 400 is connected to the top of the filter bin 104. The top of the boost cylinder 400 is connected to the second liquid guide tube 103. The top of the boost cylinder 400 is also connected to a backwashing pipe 401. The backwashing pipe 401 extends into the filter bin 104 and is used to backwash the filter screen 106.

[0045] The booster assembly is disposed in the booster cylinder 400 and is used to boost the pressure of the backwash pipe 401 when the liquid inlet tank 100 is connected to the second liquid guide pipe 103. Figure 4 ,for Figure 2The booster assembly includes a sealing plate 406 , a piston plate 402 , a pull rope 404 , and a support rod 405 .

[0046] The sealing plate 406 is used to actively block the backwash pipe 401. Specifically, a magnetic ring 407 is embedded in the inner top of the booster cylinder 400 corresponding to the inlet of the backwash pipe 401, which is used to magnetically adsorb the sealing plate 406. In addition, a longitudinal slide rail 409 is fixed to the inner wall of the booster cylinder 400. The slide rail 409 is located above the piston plate 402 and a limit block 410 is installed at its bottom. A slider 408 is slidably connected to the slide rail 409, and the slider 408 is connected to the sealing plate 406, so that the sealing plate 406 moves along the direction of the slide rail 409.

[0047] The piston plate 402 is connected to the inner top of the boost cylinder 400 through the tension spring 403, and is used to move up and down in the boost cylinder 400 under the action of the hydraulic pressure and the tension spring 403. One end of the pull rope 404 is connected to the sealing plate 406 and the other end is connected to the piston plate 402, and is used to pull the sealing plate 406 away from the magnetic ring 407 when the liquid above the piston plate 402 increases to a critical value. The support rod 405 is used to lift the sealing plate 406 when the tension spring 403 is reset, and make the sealing plate 406 adsorbed by the magnetic ring 407.

[0048] See also Figure 5 , that is, it is in the backwashing stage one position (i.e., it has just switched to the connection between the liquid inlet tank 100 and the liquid guide tube 102). This position corresponds to the connection between the liquid inlet tank 100 and the liquid guide tube 102, the valve 108 is turned to the open state, and the valve 2 111 is turned to the closed state. In this way, since the valve 108 is opened, the waste liquid remaining in the liquid guide tube 102 and the filter tank 104 is discharged from the drain pipe 107 to avoid weakening the subsequent flushing effect; since the valve 2 111 is closed, the waste liquid passes through the liquid guide tube 2 103 and is filtered by the filter screen 2 109, and then flows into the booster cylinder 400. At this time, the sealing plate 406 is still adsorbed by the magnetic ring 407, so that the inlet of the backwashing tube 401 is closed, thus forming a single-port liquid inlet piston mechanism.

[0049] See also Figure 6 , in the backwashing stage 2. In this position, the liquid guide tube 2 103 continuously fills the waste liquid above the piston plate 402, the piston plate 402 moves downward under the hydraulic pressure, the support rod 405 moves away from the sealing plate 406, the tension spring 402 is deformed, and the pull rope 404 is gradually tightened. Figure 7 As shown, this is the critical state of the booster assembly, at which time the pull rope 404 has been tensioned and the sealing plate 406 is subjected to the pulling force of the pull rope 404.

[0050] See also Figure 8, in the backwashing stage three position. In this position, the pull rope 404 pulls the sealing plate 406 apart, that is, separates it from the magnetic ring 407. It should be noted that the magnetic ring 407 can be made of permanent magnets, and the sealing plate 406 is made of a material that can be magnetically adsorbed, such as iron or iron alloy, so that the density of the sealing plate 406 is greater than the density of the waste liquid. Fig. 9 After the sealing plate 406 is separated from the magnetic ring 407, it moves along the slide rail 409 with the slider 408 until it is stuck by the stop block 410, and the inlet of the backwash pipe 401 is opened. For the booster cylinder 400, at this time, the top end is still taking in liquid, and the piston plate 402 moves upward due to the deformation recovery of the tension spring 403. The only outlet is the backwash pipe 401, which is equivalent to boosting the backwash pipe 401 and increasing the flow rate of the backwash pipe 401.

[0051] And because the waste liquid in the filter chamber 104 has been discharged before, the backwash pipe 401 forms a water flow to backwash the filter screen 106. The impurities on the filter screen 106 are directly discharged from the drain pipe 107 after backwashing, avoiding the impurities still existing in the filter chamber 2104 and affecting the filtering effect.

[0052] It should be noted that, in this working position, there is a certain distance between the sealing plate 406 and the magnetic ring 407, which can prevent the sealing plate 406 from being re-adsorbed by the magnetic ring 407 too early when water flows out of the backwash pipe 401.

[0053] Of course, the liquid outlet pipe 105 can also be designed to be an inverted U-shape, one end of which is connected to the other end of the filter chamber 104 in the horizontal direction, and the other end is used to discharge the filtered waste liquid. In this way, the inverted U-shaped structure is used to reduce the backflow of the liquid outlet pipe 105 during backwashing, and to avoid the backwashing water from being discharged from the liquid outlet pipe 105.

[0054] After a round of backwashing, the liquid inlet tank 100 is switched back to be connected with the liquid guide tube 102, the valve 108 is closed, and the valve 2 111 is opened. In this way, the waste liquid is filtered through the cleaned filter screen 106 and discharged from the liquid outlet pipe 105. The waste water remaining in the liquid guide tube 103 is also discharged through the liquid discharge pipe 110 to be emptied. It should be noted that the piston plate 402 will move upward under the deformation recovery of the tension spring 403, so that the support rod 405 contacts the sealing plate 406 and lifts the sealing plate 406, so that the sealing plate 406 is close to the magnetic ring 407 and is adsorbed by the magnetic ring 407 again to achieve resetting.

[0055] Of course, in order to avoid the impact caused by the entry of foreign matter, a one-way valve can be installed in each of the drain pipe 107 and the drain pipe 110. The one-way valve of the drain pipe 107 controls the liquid to flow out of the filter chamber 104 in one direction, and the one-way valve of the drain pipe 110 controls the liquid to flow out of the liquid guide pipe 2 103 in one direction.

[0056] In addition, in order to further reduce the workload of maintenance personnel, a remote electric control method can be adopted, for example, a controller is set up to form a control component in conjunction with a filter screen one status monitor. The controller controls the switching component to work according to the status of the filter screen one 106. When the filter screen one 106 is blocked, the liquid tank 100 is switched to be connected with the liquid guide tube two 103. If a pressure sensor 600 is installed accordingly, the controller controls the forward and reverse rotation of the drive motor 200 according to the monitoring data of the pressure sensor 600: Specifically, if the pressure sensor 600 detects that the pressure in the filter tank 104 is higher than the set pressure threshold, the drive motor 200 is controlled to rotate, the valve one 108, the valve two 111, and the switch turntable 202 are switched to switch from filtering the waste liquid to backwashing the filter screen one 106. After a delay of a period of Δt (i.e., a pressurized backwashing is completed), the controller controls the drive motor 200 to reverse again, switching from backwashing the filter screen one 106 to filtering the waste liquid.

[0057] Similarly, if a flow meter is installed, the controller controls the driving motor 200 to rotate according to the monitoring data of the flow meter: Specifically, if the flow meter detects that the outlet flow rate is lower than the set flow rate threshold, the driving motor 200 is controlled to rotate, and the valve 108, the valve 2 111, and the switching disk 202 are switched to switch from filtering the waste liquid to backwashing the filter 106. After a delay of a period of Δt, the controller controls the driving motor 200 to reverse, switching from backwashing the filter 106 to filtering the waste liquid.

[0058] In another embodiment, Figure 2 As shown, a moving rod 501 can be connected under the piston plate 402, and the moving rod 501 extends into the filter bin 104 and is connected with a scraper 502. The scraper 502 is located on the side of the filter screen 106 facing the liquid guide tube 102, and is used to scrape and clean the filter screen 106.

[0059] So, see Figure 2 When the liquid inlet tank 100 is connected to the liquid guide tube 102, the scraper 502 is at a high position. Figure 5 , Figure 7 , Figure 8 When the liquid inlet tank 100 is connected to the second liquid guide pipe 103, the scraper 502 moves synchronously with the piston plate 402, that is, in the first and second backwashing stages, the scraper 502 moves down and scrapes the impurities of the filter screen 106 to the lower part. In the third backwashing stage, after the sealing plate 406 is separated from the magnetic ring 407, the scraper 502 moves up with the piston plate 402, so that the backwashing pipe 401 can be extended to the side of the filter screen 106 facing the liquid outlet pipe 105 and facing the lower part of the filter screen 106, so that the backwashing water flow is concentrated on the lower part of the filter screen 106, and the impurities are quickly washed away and discharged from the liquid discharge pipe 107.

[0060] In this way, the booster component is used to achieve synchronous scraping of the filter screen 106, and the booster backwashing is combined to ensure the cleaning effect of the filter screen 106.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen, characterized in that: include: The liquid inlet bin is connected with a waste liquid inlet pipe at the top thereof for introducing waste liquid from permanent magnet processing; the bottom of the liquid inlet bin is provided with an outlet 1 and an outlet 2, the outlet 1 is connected with a liquid guide pipe 1, and the outlet 2 is connected with a liquid guide pipe 2; the liquid guide pipe 2 is provided with a filter screen 2, and a liquid discharge pipe 2 is connected to the bottom of the liquid guide pipe 2 corresponding to the filter screen 2 and close to the liquid inlet bin, and a valve 2 is provided on the liquid discharge pipe 2; A filter chamber, one transverse end of which is connected to a liquid guide pipe 1, and the other transverse end of which is connected to a liquid outlet pipe; a filter screen 1 is arranged in the filter chamber; a drain pipe 1 is connected to the bottom of the liquid guide pipe 1, and a drain pipe 1 is connected to the side of the bottom of the liquid guide pipe 1 corresponding to the filter screen 2 facing away from the liquid outlet pipe, and a valve 1 is arranged on the drain pipe 1; A switching component is used to switch the connection between the liquid inlet bin and the liquid guide tube 1 or the liquid guide tube 2; the switching component is also in transmission connection with valve 1 and valve 2, and is used to synchronously switch the switch state of valve 1 and valve 2, and match the connection state of the liquid inlet bin; A booster cylinder is connected to the top of the filter bin; the top of the booster cylinder is connected to the second liquid guide tube; the top of the booster cylinder is also connected to a backwashing pipe; the backwashing pipe extends into the filter bin for backwashing the filter screen 1; as well as A booster assembly is arranged in the booster cylinder and is used to boost the backwash pipe when the liquid inlet tank is connected to the second liquid guide pipe; wherein the booster assembly includes: A sealing plate is used to flexibly seal the backwash pipe; a magnetic ring is provided on the inner top of the booster cylinder corresponding to the inlet of the backwash pipe, which is used to magnetically adsorb the sealing plate; a longitudinal slide rail is provided on the inner wall of the booster cylinder, the slide rail is located above the piston plate, and a limit block is provided at the bottom end thereof; a slider is provided on the slide rail, and the slider is connected to the sealing plate; The piston plate is connected to the inner top of the booster cylinder through a tension spring and is used to move up and down in the booster cylinder under the action of hydraulic pressure and the tension spring; A pull rope, one end of which is connected to the sealing plate and the other end of which is connected to the piston plate, and is used to pull the sealing plate away from the magnetic ring when the liquid above the piston plate increases to a critical value; and The support rod is used to lift the sealing plate when the tension spring is reset and make the sealing plate be attracted by the magnetic ring.

2. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 1 is characterized in that: The liquid inlet bin is a hollow cylindrical cavity; the distances from the center of the outlet 1 and the center of the outlet 2 to the center of the bottom of the liquid inlet bin are the same; The switching component comprises: A driving motor is fixed on the outer top of the liquid inlet bin; A driving shaft is rotatably arranged in the liquid inlet bin and is coaxially arranged with the liquid inlet bin; the top end of the driving shaft extends out of the liquid inlet bin and is connected to the output end of the driving motor; and The switching turntable is arranged close to the inner bottom of the liquid inlet bin and is coaxially connected with the driving shaft; the switching turntable is provided with a liquid through hole corresponding to the first outlet or the second outlet.

3. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 2, characterized in that: The driving shaft extends out of the bottom of the liquid tank, and worm gear 1 and worm gear 2 are arranged at intervals; the valve stem of valve 1 is arranged facing the driving shaft, and worm gear 1 meshing with worm gear 1 is arranged; the valve stem of valve 2 is also arranged facing the driving shaft, and worm gear 2 meshing with worm gear 2 is arranged.

4. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 3, characterized in that: When the liquid inlet tank is connected to the liquid guide tube 1, valve 1 is closed and valve 2 is opened; when the liquid inlet tank is connected to the liquid guide tube 1, valve 1 is opened and valve 2 is closed.

5. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 2, characterized in that: The permanent magnet processing waste liquid treatment device also includes a control component; The control component comprises: A filter status monitor, which is used to monitor the status of the filter; and The controller controls the operation of the switching component according to the state of the filter screen 1; wherein, when the filter screen 1 is blocked, the controller switches to connect with the liquid tank and the liquid guide tube 2.

6. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 5, characterized in that: The filter screen status monitor is a pressure sensor; the pressure sensor is arranged in the filter bin and is located on one side of the filter screen facing the liquid guide tube 1, and is used to detect the pressure in the filter bin to reflect the blockage condition of the filter screen 1.

7. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 1, characterized in that: The liquid outlet pipe is in an inverted U shape, one end of which is connected to the other end of the filter bin in the horizontal direction, and the other end is used for discharging the filtered waste liquid.

8. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 1, characterized in that: A moving rod is connected below the piston plate, the moving rod extends into the filter bin and is connected to a scraper; the scraper is located on one side of the filter screen facing the liquid guide tube 1, and is used to scrape and clean the filter screen 1.

9. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 7, characterized in that: When the liquid inlet bin is connected to the liquid guide pipe 1, the scraper 1 is at a high position; when the liquid inlet bin is connected to the liquid guide pipe 2, the scraper 1 first moves down and scrapes the impurities of the filter screen 1 to the lower part, and then moves up after the sealing plate is separated from the magnetic ring.

10. The permanent magnet processing waste liquid treatment device capable of self-cleaning the filter screen according to claim 7, characterized in that: The backwash pipe extends to the side of the filter screen facing the liquid outlet pipe and faces the lower part of the filter screen.

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