Waste liquid recovery device for injection molding machine and use method

Abstract

The invention discloses a waste liquid recovery device for an injection molding machine and a using method, the waste liquid recovery device comprises a recovery box, through the arrangement of a pretreatment mechanism, a magnetic separator and a fine filtering mechanism, an accurate solution is provided for common plastic particles, metal scraps and additive residues in injection molding machine cleaning waste liquid, cross contamination is avoided, and the recovery efficiency is improved. Non-metal impurities such as large-particle plastics and fibers in the waste liquid are removed through the coarse filter screen, ferromagnetic metal impurities are adsorbed by the magnetic separator, and micron and nano-scale particles in the waste liquid are intercepted step by step by the plate frame type filter cloth and the microporous filter membrane, so that the turbidity of the waste liquid is effectively reduced; the top cover, the coarse filter screen, the fine filter mechanism and the magnetic separator are all detachably designed, rapid maintenance or replacement is facilitated, downtime is shortened, the magnetic separator and the fine filter mechanism can be independently overhauled due to the design of a maintenance door and an inserting groove, a filter frame is connected with a recycling box through the inserting groove, combination of filter cloth and a filter membrane is conveniently adjusted according to components of waste liquid, and the waste liquid recycling efficiency is improved. The method adapts to different production scenes.

Description

Technical Field

[0001] The present invention belongs to the technical field of injection molding machines, and particularly relates to a waste liquid recovery device for an injection molding machine and a usage method thereof. Background Art

[0002] An injection molding machine is also known as an injection molding press or an injection machine. It is the main molding equipment for making various shaped plastic products from thermoplastic or thermosetting plastics using plastic molding dies, and is divided into vertical, horizontal, and all-electric types. The injection molding machine can heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity.

[0003] When changing the mold or material of the injection molding machine, it is necessary to clean the barrel and the mold to avoid contamination of new batches of products by residues. The cleaning waste liquid may contain plastic particles, color masterbatches, additives, etc., and it needs to be filtered when recovering the cleaning waste liquid. For this reason, we propose a waste liquid recovery device for an injection molding machine and a usage method to solve the problems existing in the prior art. Summary of the Invention

[0004] The purpose of the present invention is to provide a waste liquid recovery device for an injection molding machine and a usage method thereof. Through the cooperation of a pretreatment mechanism and a fine filtration mechanism, the waste liquid is filtered multiple times to solve the problems in the prior art mentioned in the above background art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A waste liquid recovery device for an injection molding machine includes a recovery tank, a top cover is detachably installed on the top of the recovery tank, and a liquid receiving hopper for receiving waste liquid is fixedly installed at the center of the top cover;

[0007] A pretreatment mechanism for pretreating the waste liquid is installed below the liquid receiving hopper in the recovery tank, and a magnetic separator for adsorbing and separating metal impurities in the waste liquid is installed below the pretreatment mechanism;

[0008] A plug-in slot is opened on one side of the recovery tank, a fine filtration mechanism is inserted into the plug-in slot, and a drain pipe is fixedly connected to the bottom of one side of the recovery tank, and a second solenoid valve is arranged on the outer wall of the drain pipe.

[0009] Preferably, the pretreatment mechanism includes a processing shell, the processing shell is fixedly installed on the inner wall of the recovery tank, a support bracket is fixedly installed on the inner wall of the processing shell, a coarse filter screen is inserted and installed on the top of the support bracket, a liquid outlet pipe is fixedly connected to the bottom of the processing shell, and a first solenoid valve is arranged on the outer wall of the liquid outlet pipe.

[0010] Preferably, at the center of both ends of the coarse filter screen, there are fixedly embedded with handle frames extending below the coarse filter screen. At both ends of the support bracket, there are grooves corresponding to the bottom of the handle frames, and the bottom of the handle frame is inserted into the interior of the grooves.

[0011] Preferably, the fine filtration mechanism includes a filter frame. The filter frame is inserted into the interior of the recycling box through a plug-in slot. On one side of the filter frame, there are symmetrically arranged two groups of installation slots extending into the interior of the filter frame. Inside the two groups of installation slots, a plate-frame filter cloth and a microporous filter membrane are sequentially inserted and installed along the liquid flow direction.

[0012] Preferably, a sealing plate is fixedly installed on one side of the filter frame, and the sealing plate is inserted into the interior of the plug-in slot.

[0013] Preferably, on both sides of the inner wall of the recycling box, there are symmetrically fixedly installed two groups of support plates, and the filter frame is located on top of the two groups of support plates.

[0014] Preferably, on both sides of the inner wall of the recycling box, there are symmetrically fixedly installed two groups of fixing frames, and the magnetic separator is fixedly installed on top of the two groups of fixing frames through shock pads.

[0015] Preferably, on the inner bottom of the recycling box, there is an inclined plate facilitating liquid discharge. The drain pipe is located at the inclined low end of the inclined plate, and at the bottom of the recycling box, there are symmetrically fixedly installed four groups of self-locking universal wheels.

[0016] Preferably, above the plug-in slot of the recycling box, there is a maintenance door facilitating the maintenance of the magnetic separator, and on one side of the recycling box away from the maintenance door, there is an observation window.

[0017] A method for recycling and reusing waste liquid for an injection molding machine includes the following steps:

[0018] Step 1: Move the device to a suitable position through the push rod on one side of the recycling box and the four groups of self-locking universal wheels at the bottom. When replacing the mold or material of the injection molding machine, the cleaning waste liquid generated by cleaning the barrel and the mold is injected into the recycling box through the liquid receiving hopper. The cleaning waste liquid is stored by the processing shell in the pretreatment mechanism, and the cleaning waste liquid is pre-filtered by the coarse filter screen to remove large particle plastics, fibers and other non-metallic impurities in the waste liquid, protecting the subsequent equipment. At the same time, treatment agents can also be added through the liquid receiving hopper. If the waste liquid is strongly acidic or alkaline, it needs to be neutralized to a neutral pH first to avoid corroding the equipment. For example, flocculants such as PAC and PAM are added to pretreat the suspended substances to reduce the subsequent filtration pressure;

[0019] Step 2: After being processed by the pretreatment mechanism, the liquid outlet pipe is controlled by the first solenoid valve at the bottom of the processing shell to open, and the pretreated waste liquid in the processing shell is discharged into the magnetic separator. The magnetic separator adsorbs ferromagnetic metal impurities such as screw wear debris to adsorb and separate the metal impurities in the waste liquid;

[0020] Step 3: The waste liquid after being adsorbed by metal impurities falls into the fine filtration mechanism. The waste liquid is filtered successively by the plate-frame filter cloth and the microporous filter membrane inserted and installed in the filter frame. The filtered liquid then falls into the bottom of the recovery tank for storage or is discharged through the drain pipe controlled by the second solenoid valve to ensure that the final effluent quality meets the discharge standard;

[0021] Step 4: When maintenance of the internal components of the device is required, the detachable top cover is removed, and the coarse filter screen is taken off from the support bracket by means of the cooperation of two sets of hand-held frames, which is convenient for cleaning and maintaining the coarse filter screen. The maintenance door is used to maintain the magnetic separator. The fine filtration mechanism can maintain or replace the plate-frame filter cloth and the microporous filter membrane in the fine filtration mechanism through the cooperation of the plug-in slots.

[0022] Technical effects and advantages of the present invention: A waste liquid recovery device and its usage method for an injection molding machine proposed by the present invention have the following advantages compared with the prior art:

[0023] 1. Through the settings of the pretreatment mechanism, the magnetic separator and the fine filtration mechanism, the present invention provides a precise solution for the common plastic particles, metal debris and additive residues in the waste liquid of injection molding machine cleaning, avoiding cross-contamination. The large-particle plastics, fibers and other non-metallic impurities in the waste liquid are removed by the coarse filter screen, the ferromagnetic metal impurities are adsorbed by the magnetic separator, and the plate-frame filter cloth and the microporous filter membrane intercept the micron and nanometer-level particles in the waste liquid step by step, effectively reducing the turbidity of the waste liquid and ensuring that the final effluent quality meets the discharge standard (such as turbidity ≤ 1 NTU);

[0024] 2. In the present invention, the top cover, the coarse filter screen, the fine filtration mechanism and the magnetic separator all adopt a detachable design, which is convenient for quick maintenance or replacement, reducing the downtime. The maintenance door and the plug-in slot design enable the magnetic separator and the fine filtration mechanism to be independently overhauled, avoiding overall disassembly and improving the maintenance efficiency. The filter frame and the recovery tank are connected through the plug-in slot, which is convenient for adjusting the filter cloth and filter membrane combination according to the waste liquid composition (such as adding an activated carbon layer to adsorb organic substances) to adapt to different production scenarios. Description of the Drawings

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the side view of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the maintenance door, the plug-in slot and the recovery tank of the present invention;

[0027] Figure 3Schematic structural view of the cross-section of the recycling bin of the present invention;

[0028] Figure 4 Schematic structural view of the pretreatment mechanism of the present invention;

[0029] Figure 5 Schematic structural view of the fine filtration mechanism of the present invention.

[0030] In the figure: 1, recycling bin; 2, top cover; 3, liquid receiving hopper; 4, pretreatment mechanism; 41, treatment shell; 42, support bracket; 43, coarse filter screen; 44, handle holder; 45, liquid outlet pipe; 46, first solenoid valve; 5, magnetic separator; 6, insertion slot; 7, fine filtration mechanism; 71, filter frame; 72, installation slot; 73, plate-frame filter cloth; 74, microporous filter membrane; 75, sealing plate; 8, drain pipe; 9, second solenoid valve; 10, inclined plate; 11, support plate; 12, fixing frame; 13, self-locking universal wheel; 14, maintenance door; 15, observation window. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] The present invention provides a waste liquid recycling device for an injection molding machine as Figures 1-5 shown, which includes a recycling bin 1. A top cover 2 is detachably installed on the top of the recycling bin 1, and a liquid receiving hopper 3 for receiving waste liquid is fixedly installed at the center of the top cover 2;

[0033] The top cover 2 is designed to be detachable (such as bolt installation), which is convenient for the maintenance of the overall equipment and the inspection of internal components, and at the same time ensures the airtightness during waste liquid treatment to avoid the diffusion of peculiar smell;

[0034] A pretreatment mechanism 4 for pretreating waste liquid is installed below the recycling bin 1 under the liquid receiving hopper 3, and a magnetic separator 5 for adsorbing and separating metal impurities in the waste liquid is installed below the pretreatment mechanism 4;

[0035] One side of the recycling bin 1 is provided with a plug-in slot 6, and a fine filtration mechanism 7 is inserted inside the plug-in slot 6. One side of the bottom of the recycling bin 1 is fixedly communicated with a drain pipe 8, and a second solenoid valve 9 is arranged on the outer wall of the drain pipe 8. Recommended model of the second solenoid valve 9: ASCO 8210G002 (normally closed type), nominal diameter: DN15 (matched with the drain pipe 8), voltage: 24V DC (low-power safety voltage), medium temperature: -10°C to 120°C (resistant to the high temperature of the waste liquid of the injection molding machine), realizing the precise discharge control of the purified liquid and preventing the accidental outflow of the unqualified waste liquid.

[0036] Furthermore, the pretreatment mechanism 4 includes a processing shell 41, the processing shell 41 is fixedly installed on the inner wall of the recycling bin 1, a support bracket 42 is fixedly installed on the inner wall of the processing shell 41, a coarse filter screen 43 is inserted and installed on the top of the support bracket 42, the bottom of the processing shell 41 is fixedly communicated with a liquid outlet pipe 45, and a first solenoid valve 46 is arranged on the outer wall of the liquid outlet pipe 45.

[0037] The coarse filter screen 43 is inserted and installed, which supports quick disassembly, cleaning or replacement, avoids large particle impurities from blocking the subsequent magnetic separator 5, reduces the downtime, and the first solenoid valve 46 controls the liquid outlet: adjusts the liquid flow rate in the pretreatment stage by opening and closing to prevent the liquid level in the processing shell 41 from being too high and causing overflow. Recommended model of the first solenoid valve 46: ASCO 8210G002 (normally closed type), nominal diameter: DN15 (matched with the liquid outlet pipe 45), voltage: 24V DC (low-power safety voltage), medium temperature: -10°C to 120°C (resistant to the high temperature of the waste liquid of the injection molding machine).

[0038] Specifically, at the middle positions of both ends of the coarse filter screen 43, a handle holder 44 extending below the coarse filter screen 43 is fixedly embedded, grooves corresponding to the bottom of the handle holder 44 are opened at both ends of the support bracket 42, and the bottom of the handle holder 44 is inserted into the inside of the groove.

[0039] The cooperation between the handle holder 44 and the groove: provides a dual positioning function, ensures that the coarse filter screen 43 has no deviation after installation, and at the same time, the design of the handle extending downward avoids the operator from contacting the waste liquid and improves the safety.

[0040] Furthermore, the fine filtration mechanism 7 includes a filter frame 71, the filter frame 71 is inserted into the recycling bin 1 through the plug-in slot 6, two groups of installation slots 72 extending to the inside of the filter frame 71 are symmetrically opened on one side of the filter frame 71, and a plate frame filter cloth 73 and a microporous filter membrane 74 are sequentially inserted and installed in the two groups of installation slots 72 along the liquid flow direction.

[0041] Filtering in layers along the liquid flow direction: the plate frame filter cloth 73 first intercepts particles larger than 50μm, and the microporous filter membrane 74 then intercepts particles larger than 5μm. The multi-stage filtration makes the suspended solid content of the purified liquid ≤10ppm. The extended design of the installation slot 72: avoids the filter material from sagging and deforming due to gravity and extends the service life of the filter cloth / filter membrane.

[0042] Specifically, a sealing plate 75 is fixedly installed on one side of the filter frame 71, and the sealing plate 75 is inserted into the inside of the insertion slot 6.

[0043] The sealing plate 75 and the insertion slot 6 are in interference fit: adopting a structure with a silicone rubber sealing ring embedded, ensuring no liquid leakage on the side after the filter frame 71 is installed, and the sealing pressure can reach 0.2 MPa.

[0044] Specifically, two groups of support plates 11 are symmetrically and fixedly installed on both sides of the inner wall of the recycling box 1, and the filter frame 71 is located on the top of the two groups of support plates 11.

[0045] The support plate 11 is designed for load-bearing: made of stainless steel material and provided with reinforcing ribs, the unilateral load-bearing capacity ≥ 50 kg, preventing the filter frame 71 from shifting due to liquid impact.

[0046] Specifically, two groups of fixing frames 12 are symmetrically and fixedly installed on both sides of the inner wall of the recycling box 1, and the magnetic separator 5 is fixedly installed on the top of the two groups of fixing frames 12 through a shock pad.

[0047] The fixing frame 12 supports and installs the magnetic separator 5, and the shock pad (rubber material): reduces the interference of vibration on the magnetic separator 5.

[0048] Specifically, a sloping plate 10 for facilitating liquid discharge is arranged at the inner bottom of the recycling box 1, the drain pipe 8 is located at the inclined low end of the sloping plate 10, and four groups of self-locking universal wheels 13 are symmetrically and fixedly installed at the bottom of the recycling box 1.

[0049] The inclination angle of the sloping plate 10 is 15°: the angle is optimized through fluid mechanics simulation, the liquid residue < 0.5 L, reducing by 90% compared with the flat bottom design, and the self-locking universal wheels 13: equipped with a foot brake device, which can be quickly fixed after moving in the workshop to prevent accidents caused by equipment sliding.

[0050] Specifically, a maintenance door 14 for facilitating the maintenance of the magnetic separator 5 is arranged above the insertion slot 6 of the recycling box 1, and an observation window 15 is arranged on one side of the recycling box 1 away from the maintenance door 14.

[0051] The design of the maintenance door 14: can maintain the magnetic separator 5, and the observation window 15 is made of double-layer tempered glass: with an anti-fog coating inside, which can observe the internal filtration and impurity accumulation situation of the recycling box 1 in real time.

[0052] A method for recycling and reusing waste liquid for an injection molding machine includes the following steps:

[0053] Step 1: Move the device to a suitable position by means of the push rod on one side of the recycling bin 1 and the four groups of self-locking universal wheels 13 at the bottom. When replacing the mold or materials of the injection molding machine, the cleaning waste liquid generated by cleaning the barrel and the mold is injected into the recycling bin 1 through the liquid receiving hopper 3. The treatment shell 41 in the pretreatment mechanism 4 stores the cleaning waste liquid, and the cleaning waste liquid is pre-filtered through the coarse filter screen 43 to remove large-particle plastics, fibers and other non-metallic impurities in the waste liquid, protecting the subsequent equipment. At the same time, treatment agents can also be added through the liquid receiving hopper 3. If the waste liquid is strongly acidic or alkaline, it needs to be neutralized to a neutral pH of 6-9 first to avoid corroding the equipment. For example, flocculants such as PAC and PAM are added to pretreat the suspended matter to reduce the subsequent filtration pressure;

[0054] Step 2: After the pretreatment mechanism 4 processes, the first electromagnetic valve 46 at the bottom of the treatment shell 41 is controlled to open the liquid outlet pipe 45, and the pretreated waste liquid in the treatment shell 41 is discharged into the magnetic separator 5. The magnetic separator 5 adsorbs ferromagnetic metal impurities such as screw wear debris to adsorb and separate the metal impurities in the waste liquid;

[0055] Step 3: The waste liquid after adsorbing metal impurities falls into the fine filtration mechanism 7. The plate-frame filter cloth 73 and the microporous filter membrane 74 inserted and installed in the filter frame 71 filter the waste liquid in turn. The filtered liquid then falls into the bottom of the recycling bin 1 for storage or is discharged through the drain pipe 8 controlled by the second electromagnetic valve 9 to ensure that the final effluent quality meets the discharge standard;

[0056] Step 4: When maintenance of the internal components of the device is required, the detachable top cover 2 is removed, and the coarse filter screen 43 is taken off the carrier 42 by means of the cooperation of the two groups of handle frames 44, so as to facilitate the cleaning and maintenance of the coarse filter screen 43. The maintenance door 14 performs maintenance on the magnetic separator 5. The fine filtration mechanism 7 can be maintained or replaced with the plate-frame filter cloth 73 and the microporous filter membrane 74 in the fine filtration mechanism 7 through the insertion slot 6.

[0057] In the present invention document, the control mode of the electrical appliances is automatically controlled by a controller. The controller is Siemens PLC S7-1200 1214C DC / DC / DC, which centrally controls devices such as the first electromagnetic valve, the magnetic separator and the second electromagnetic valve. The control circuit of the controller can be realized by simple programming by those skilled in the art, which belongs to the common knowledge in the art. And this application document is mainly used to protect the structure and shape and their combination, so the control mode and the circuit connection are not explained in detail in this application document.

[0058] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A waste liquid recovery device for an injection molding machine, comprising a recovery tank (1), characterized in that: The top of the recycling bin (1) is detachably installed with a top cover (2), and a liquid receiving hopper (3) for receiving waste liquid is fixedly installed at the center of the top cover (2); The recycling bin (1) is installed with a pretreatment mechanism (4) for pretreating waste liquid below the liquid receiving hopper (3), and a magnetic separator (5) for adsorbing and separating metal impurities in the waste liquid is installed below the pretreatment mechanism (4); A plug-in slot (6) is opened on one side of the recycling bin (1), a fine filtration mechanism (7) is inserted into the inside of the plug-in slot (6), a drain pipe (8) is fixedly communicated with the bottom of one side of the recycling bin (1), and a second electromagnetic valve (9) is arranged on the outer wall of the drain pipe (8).

2. The waste liquid recovery device for an injection molding machine according to claim 1, wherein: The pretreatment mechanism (4) includes a treatment shell (41), the treatment shell (41) is fixedly installed on the inner wall of the recycling bin (1), a support bracket (42) is fixedly installed on the inner wall of the treatment shell (41), a coarse filter screen (43) is inserted and installed on the top of the support bracket (42), a liquid outlet pipe (45) is fixedly communicated with the bottom of the treatment shell (41), and a first electromagnetic valve (46) is arranged on the outer wall of the liquid outlet pipe (45).

3. The waste liquid recovery device for an injection molding machine according to claim 2, characterized in that: At the center of both ends of the coarse filter screen (43), a hand-held frame (44) extending below the coarse filter screen (43) is fixedly embedded, grooves corresponding to the bottom of the hand-held frame (44) are opened at both ends of the support bracket (42), and the bottom of the hand-held frame (44) is inserted into the inside of the groove.

4. A waste liquid recovery device for an injection molding machine according to claim 1, characterized in that: The fine filtration mechanism (7) includes a filter frame (71), the filter frame (71) is inserted into the inside of the recycling bin (1) through the plug-in slot (6), two groups of installation slots (72) extending into the inside of the filter frame (71) are symmetrically opened on one side of the filter frame (71), and a plate-frame filter cloth (73) and a microporous filter membrane (74) are sequentially inserted and installed in the two groups of installation slots (72) along the liquid flow direction.

5. The waste liquid recovery device for an injection molding machine according to claim 4, characterized in that: A sealing plate (75) is fixedly installed on one side of the filter frame (71), and the sealing plate (75) is inserted into the inside of the plug-in slot (6).

6. The waste liquid recovery device for an injection molding machine according to claim 5, wherein: Two groups of support plates (11) are symmetrically and fixedly installed on both sides of the inner wall of the recycling bin (1), and the filter frame (71) is located on the top of the two groups of support plates (11).

7. The waste liquid recovery device for an injection molding machine according to claim 1, characterized in that: Two groups of fixing frames (12) are symmetrically and fixedly installed on both sides of the inner wall of the recycling bin (1), and the magnetic separator (5) is fixedly installed on the top of the two groups of fixing frames (12) through a shock pad.

8. A waste liquid recovery device for an injection molding machine according to claim 1, characterized in that: An inclined plate (10) for facilitating liquid discharge is arranged at the inner bottom of the recycling bin (1), the drain pipe (8) is located at the inclined low end of the inclined plate (10), and four groups of self-locking universal wheels (13) are symmetrically and fixedly installed at the bottom of the recycling bin (1).

9. The waste liquid recovery device for an injection molding machine according to claim 1, characterized in that: A maintenance door (14) for facilitating the maintenance of the magnetic separator (5) is arranged above the plug-in slot (6) of the recycling bin (1), and an observation window (15) is arranged on one side of the recycling bin (1) away from the maintenance door (14).

10. A method for recycling and using waste liquid for an injection molding machine, comprising the following steps: Step 1: Move the device to a suitable position by means of the push rod on one side of the recycling bin (1) and the four groups of self-locking universal wheels (13) at the bottom. When replacing the mold or material of the injection molding machine, the cleaning waste liquid generated by cleaning the barrel and the mold is injected into the recycling bin (1) through the liquid receiving hopper (3). The processing shell (41) in the pretreatment mechanism (4) stores the cleaning waste liquid, and the cleaning waste liquid is pre-filtered through the coarse filter screen (43) to remove large-particle plastics, fibers and other non-metallic impurities in the waste liquid, protecting the subsequent equipment. At the same time, treatment agents can also be added through the liquid receiving hopper (3). (If the waste liquid is strongly acidic or alkaline, it needs to be neutralized to neutral (pH 6-9) first to avoid corroding the equipment. For example, flocculants (such as PAC, PAM) are added to pretreat the suspended matter to reduce the subsequent filtration pressure); Step 2: After the pretreatment mechanism (4) processes, the first solenoid valve (46) at the bottom of the processing shell (41) controls the opening of the liquid outlet pipe (45), and the pretreated waste liquid in the processing shell (41) is discharged into the magnetic separator (5). The magnetic separator (5) adsorbs ferromagnetic metal impurities (such as screw wear debris) to adsorb and separate the metal impurities in the waste liquid; Step 3: The waste liquid after the adsorption of metal impurities falls into the fine filtration mechanism (7). The waste liquid is filtered in turn through the plate-frame filter cloth (73) and the microporous filter membrane (74) inserted and installed in the filter frame (71). The filtered liquid then falls into the bottom of the recycling bin (1) for storage or is discharged through the drain pipe (8) controlled by the second solenoid valve (9) to ensure that the final effluent quality meets the discharge standard; Step 4: When maintenance of the internal components of the device is required, the detachable top cover (2) is removed, and the coarse filter screen (43) is removed from the support bracket (42) by means of the cooperation of the two groups of hand-held frames (44), which is convenient for cleaning and maintaining the coarse filter screen (43). The maintenance door (14) is used to maintain the magnetic separator (5). The fine filtration mechanism (7) can be maintained or replaced with the plate-frame filter cloth (73) and the microporous filter membrane (74) in the fine filtration mechanism (7) through the cooperation of the insertion slots (6).

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