A wastewater treatment device for recyclable metals

Abstract

The present invention relates to the technical field of wastewater treatment devices, and particularly to a wastewater treatment device capable of recovering metals, including a treatment cylinder. A water inlet pipe is connected to the top of the treatment cylinder, and a drain pipe is connected to the bottom. A stirring mechanism is connected inside the treatment cylinder. The stirring mechanism includes a stirring motor, a stirring shaft, and stirring blades. The stirring motor is installed on the outer top of the treatment cylinder. The output end of the stirring motor is coaxially and fixedly connected to the stirring shaft. The stirring shaft penetrates through the top of the treatment cylinder and is coaxially and fixedly connected to the stirring blades. In the present invention, by setting a linkage assembly, a sweeping frame, a scraping plate, and a suction assembly, the linkage assembly transmits the power of the stirring motor to the sweeping frame and the scraping plate, pushing the metal particles distributed near the inner wall of the treatment cylinder under the action of centrifugal force to the vicinity of the collection box. The suction assembly sucks the wastewater containing a high concentration of metal particles into the collection box under the movement of the sweeping frame, achieving the real-time metal particle recovery treatment effect.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment devices, and particularly to a wastewater treatment device capable of recovering metals. Background Art

[0002] During industrial production processes, a large amount of industrial wastewater is often generated, and the wastewater needs to be treated to meet the discharge standards. Wastewater treatment is to treat the harmful substances in the wastewater to avoid environmental pollution caused by the discharge of wastewater.

[0003] When treating wastewater, the metal waste particles contained in the wastewater are likely to damage the components in the subsequent wastewater treatment device. Therefore, it is generally necessary to treat the metal particles in the wastewater in advance. When treating the metal particles in the wastewater, the traditional method is to intercept them through a filter screen. However, when using the filter screen filtration method, the mesh holes of the filter screen are easily blocked during use, affecting the wastewater treatment efficiency. There is also a method of treating metal particles in wastewater by precipitation. After precipitation, the wastewater containing metal particles with a higher concentration at the bottom of the sedimentation tank is separated to achieve the treatment effect. However, the treatment efficiency of the wastewater is low, and real-time continuous treatment operations cannot be carried out. In the prior art, there is a method of removing some metal particles in wastewater by magnetic attraction. Among them, two energized coils that can reciprocate and have opposite coil winding directions are used to enhance and weaken the external magnetic field to achieve the magnetic attraction collection and treatment of metal particles in wastewater. In this method, the generated magnetic field has a weak binding ability to metal particles and cannot drive the metal particles to move, thus achieving the active collection of metal particles in wastewater. Only relying on the natural flow of wastewater to carry the metal particles to move reduces the recovery efficiency of metal particles in wastewater. Summary of the Invention

[0004] A wastewater treatment device capable of recovering metals proposed by the present invention aims to solve the problems that the efficiency of treating metal particles in wastewater by precipitation in the traditional technology is low and real-time continuous treatment operations cannot be carried out.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A wastewater treatment device for recyclable metals, comprising a treatment cylinder. The top of the treatment cylinder is communicated with a water inlet pipe, and the bottom is communicated with a drain pipe. A stirring mechanism is connected inside the treatment cylinder. The stirring mechanism includes a stirring motor, a stirring shaft and stirring blades. The stirring motor is installed on the outer top of the treatment cylinder. The output end of the stirring motor is coaxially and fixedly connected with a stirring shaft. The stirring shaft penetrates through the top of the treatment cylinder and is coaxially and fixedly connected with stirring blades. A collection box is communicated with the outer side of the middle part of the treatment cylinder. The top end of the stirring shaft located inside the treatment cylinder is connected with a linkage assembly. The output end of the linkage assembly is connected with a sweeping frame. The top of the sweeping frame is coaxially rotatably connected to the inner top of the treatment cylinder. A scraping plate is fixedly connected to the sweeping frame. The side of the scraping plate away from the stirring shaft abuts against the inner side wall of the treatment cylinder. A suction assembly is connected between the collection box and the treatment cylinder. The input end of the suction assembly is connected with the sweeping frame. The suction assembly is used to communicate the collection box and the treatment cylinder when the sweeping frame rotates past the collection box. A communicating pipe is communicated with the bottom of the collection box, and a solenoid valve is installed on the communicating pipe.

[0007] Preferably, the linkage assembly includes a driving gear, a transmission belt, a connecting gear, a connecting shaft, a rotating gear and an internal gear ring. The driving gear is coaxially and fixedly connected to the stirring shaft. The connecting shaft is rotatably connected to the inner top of the treatment cylinder. The connecting gear and the rotating gear are both coaxially and fixedly connected to the connecting shaft. The driving gear and the connecting gear are sleeved with the same transmission belt. The side of the rotating gear away from the stirring shaft meshes with the internal gear ring. The outer side of the internal gear ring is coaxially and fixedly connected to the sweeping frame, transmitting the power of the stirring motor to the sweeping frame.

[0008] Preferably, the suction assembly includes a fixed mesh plate, a sliding mesh plate, a return spring, a blocking block, a pushing component and a telescopic spring. The fixed mesh plate is fixedly connected inside the collection box. An arc-shaped groove is formed on the inner side wall of the treatment cylinder. The sliding mesh plate is slidably connected in the arc-shaped groove. A return spring is fixedly connected between one end of the sliding mesh plate and the arc-shaped groove. A blocking block is fixedly connected to the side of the sliding mesh plate away from the collection box. The pushing component is slidably connected to the sweeping frame along the circumferential direction of the treatment cylinder. A telescopic spring is fixedly connected between the pushing component and the sweeping frame. One end of the pushing component away from the inner side wall of the treatment cylinder is wedge-shaped, and the wedge-shaped inclined surface faces the blocking block. When the sweeping frame rotates, the blocking block is pushed by the pushing component, so that the sliding mesh plate coincides with the fixed mesh plate, and then the treatment cylinder is communicated with the collection box, so that the wastewater containing high-concentration metal particles near the collection box in the treatment cylinder is pumped into the collection box, forming a real-time recovery effect of metal particles.

[0009] Preferably, a plurality of through holes are formed in both the fixed net plate and the sliding net plate. Initially, the sliding net plate and the fixed net plate are staggered and attached to each other, and the plurality of through holes on both of them are sealed to keep the collection box and the treatment cylinder closed, facilitating the suction effect of the empty collection box on the wastewater in the treatment cylinder. The maximum sliding distance of the sliding net plate is equal to the distance between adjacent through holes on the sliding net plate and the fixed net plate.

[0010] Preferably, both the return spring and the telescopic spring are initially in a natural state. The elastic coefficient of the telescopic spring is greater than that of the return spring. When the pushing member pushes the blocking block to move, the return spring is first compressed to the limit and then the telescopic spring is compressed to the limit, so as to keep the two net plates in a coincident state during the process of the telescopic spring being compressed to the limit, facilitating the short-term continuous connection between the collection box and the treatment cylinder.

[0011] Preferably, an auxiliary component is connected to the sweeping frame. The auxiliary component includes a conductive block, a conductive ring and an electromagnet group. The conductive block is fixedly connected to the top of the sweeping frame. The conductive ring includes a plurality of conductive sheets, and the plurality of conductive sheets are all coaxially fixedly connected to the inner side wall of the treatment cylinder. The electromagnet group includes a plurality of electromagnets. Some of the electromagnets are fixedly connected to the outside of the side wall of the treatment cylinder and are located in the gap between adjacent collection boxes. Some of the electromagnets are fixedly connected to the outside of the side wall of the collection box. The plurality of electromagnets are electrically connected to the plurality of conductive sheets in one-to-one correspondence. The conductive block, the conductive ring and the electromagnet group are all electrically connected to an external power supply.

[0012] Preferably, the conductive sheet is a sliding rheostat, and both ends of the sliding rheostat are connected to the circuit. The conductive block is electrically connected to the sliding end of the sliding rheostat. When the conductive block moves, the conductive sheet swept by it is short-circuited, so that the electromagnet corresponding to this part of the conductive sheet is powered off. At the same time, the resistance value in the circuit is reduced, enhancing the current intensity of the electromagnet corresponding to the conductive sheet not swept, enhancing the magnetic attraction intensity of the electromagnet, facilitating the magnetic constraint of metal particles near the inner wall of the treatment cylinder all the time until the metal particles finally fall into the collection box, completing a collection cycle.

[0013] Preferably, a control switch is installed on the inner wall of the treatment cylinder. The control switch is electrically connected to the conductive block and is also electrically connected to the solenoid valve. The control switch is located between the starting and ending conductive sheets, that is, between the conductive sheet of the collection box and the first conductive sheet after passing through the collection box, facilitating the solenoid valve to conduct and discharge the wastewater with high concentration in the collection box after the collection box and the treatment cylinder are relatively closed.

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

[0015] 1. In the present invention, by providing a linkage assembly, a sweeping frame, a scraping plate and a suction assembly, the linkage assembly transmits the power of the stirring motor to the sweeping frame and the scraping plate, pushing the metal particles distributed near the inner wall of the treatment cylinder under the centrifugal force to the vicinity of the collection box. The suction assembly sucks the wastewater containing a high concentration of metal particles into the collection box under the movement of the sweeping frame, achieving a real-time metal particle recovery treatment effect, forming a continuous separation and collection effect, and improving the recovery efficiency of metal particles in the wastewater.

[0016] 2. In the present invention, by providing an auxiliary assembly, the distribution effect of metal particles in the treatment cylinder on the inner side wall of the treatment cylinder is further improved through magnetic attraction. At the same time, as the sweeping frame moves, the electromagnets corresponding to the treatment cylinder that have been swept are automatically powered off, facilitating the further collection of metal particles in the wastewater by the electromagnet in the collection box, and further improving the recovery efficiency of metal particles in the wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic diagram of the suction assembly of the present invention;

[0019] Figure 3 is a partial schematic diagram of the auxiliary assembly of the present invention.

[0020] In the figure: 1 treatment cylinder, 2 water inlet pipe, 3 stirring mechanism, 31 stirring motor, 32 stirring shaft, 33 stirring blades, 4 collection box, 41 connecting pipe, 42 solenoid valve, 5 linkage assembly, 51 driving gear, 52 transmission belt, 53 connecting gear, 54 connecting shaft, 55 rotating gear, 56 internal gear ring, 6 sweeping frame, 61 scraping plate, 7 suction assembly, 71 fixed mesh plate, 72 sliding mesh plate, 73 return spring, 74 blocking block, 75 pushing component, 76 telescopic spring, 8 auxiliary assembly, 81 conductive block, 82 conductive ring, 83 electromagnet group. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 of the embodiments.

[0022] Refer to Figures 1-3 , a wastewater treatment device for recovering metals, including a treatment cylinder 1. The top of the treatment cylinder 1 is connected to a water inlet pipe 2, and the bottom is connected to a drain pipe. Valves are installed on both the water inlet pipe 2 and the drain pipe. Wastewater containing metal particles is introduced through the water inlet pipe 2, and wastewater containing low-concentration metal particles is discharged through the drain pipe.

[0023] A stirring mechanism 3 is connected inside the treatment cylinder 1. The stirring mechanism 3 includes a stirring motor 31, a stirring shaft 32, and stirring blades 33. The stirring motor 31 is installed on the outer top of the treatment cylinder 1. The output end of the stirring motor 31 is coaxially and fixedly connected to the stirring shaft 32. The stirring shaft 32 penetrates through the top of the treatment cylinder 1 and is coaxially and fixedly connected to the stirring blades 33. The stirring motor 31 drives the stirring blades 33 to rotate through the stirring shaft 32, centrifugally stirring the wastewater in the treatment cylinder 1, so that the metal particles in the wastewater are distributed near the inner side wall of the treatment cylinder 1 under the action of centrifugal force, which is convenient for being collected when the subsequent components work.

[0024] A collection box 4 is communicated with the outer side of the middle part of the treatment cylinder 1. The top end of the stirring shaft 32 located inside the treatment cylinder 1 is connected with a linkage assembly 5. The output end of the linkage assembly 5 is connected with a sweeping frame 6. The linkage assembly 5 includes a driving gear 51, a transmission belt 52, a connecting gear 53, a connecting shaft 54, a rotating gear 55, and an internal gear ring 56. The driving gear 51 is coaxially and fixedly connected to the stirring shaft 32. The connecting shaft 54 is rotatably connected to the inner top of the treatment cylinder 1. The connecting gear 53 and the rotating gear 55 are both coaxially and fixedly connected to the connecting shaft 54. The driving gear 51 and the connecting gear 53 are sleeved with the same transmission belt 52. The rotating gear 55 meshes with the internal gear ring 56 on the side far away from the stirring shaft 32. The outer side of the internal gear ring 56 is coaxially and fixedly connected to the sweeping frame 6. The rotation of the stirring shaft 32 drives the driving gear 51 to rotate. The driving gear 51 drives the connecting gear 53 to rotate through the transmission belt 52. The connecting gear 53 drives the rotating gear 55 to rotate through the connecting shaft 54. The rotating gear 55 drives the internal gear ring 56 to rotate through meshing. The internal gear ring 56 drives the sweeping frame 6 to rotate, improving the power transmission effect for the movement of the sweeping frame 6.

[0025] The top of the sweeping frame 6 is coaxially and rotatably connected to the inner top of the treatment cylinder 1. A scraping plate 61 is fixedly connected to the sweeping frame 6. The side of the scraping plate 61 far away from the stirring shaft 32 abuts against the inner side wall of the treatment cylinder 1. The rotation of the sweeping frame 6 drives the scraping plate 61 to move. The movement of the scraping plate 61 thus pushes the metal particles distributed near the inner wall of the treatment cylinder 1 into the collection box 4, facilitating the collection of the metal particles.

[0026] A suction assembly 7 is connected between the collection box 4 and the treatment cylinder 1. The input end of the suction assembly 7 is connected to the sweeping frame 6. The suction assembly 7 is used to connect the collection box 4 and the treatment cylinder 1 when the sweeping frame 6 rotates past the collection box 4. The suction assembly 7 includes a fixed mesh plate 71, a sliding mesh plate 72, a return spring 73, a blocking block 74, a pushing member 75 and a telescopic spring 76. The fixed mesh plate 71 is fixedly connected inside the collection box 4. An arc-shaped groove is formed on the inner side wall of the treatment cylinder 1. The sliding mesh plate 72 is slidably connected in the arc-shaped groove. A return spring 73 is fixedly connected between one end of the sliding mesh plate 72 and the arc-shaped groove. A blocking block 74 is fixedly connected to the side of the sliding mesh plate 72 away from the collection box 4. The pushing member 75 is slidably connected to the sweeping frame 6 along the circumferential direction of the treatment cylinder 1. A telescopic spring 76 is fixedly connected between the pushing member 75 and the sweeping frame 6. One end of the pushing member 75 away from and close to the inner side wall of the treatment cylinder 1 is wedge-shaped, and the wedge-shaped inclined surface faces the blocking block 74. The pushing member 75 includes a sliding sleeve, a wedge-shaped block and a compression spring. The sliding sleeve is slidably connected to the sweeping frame 6 along the circumferential direction of the treatment cylinder 1. The wedge-shaped block is slidably connected to the sliding sleeve along the radial direction of the treatment cylinder 1. A compression spring is fixedly connected between the wedge-shaped block and the sliding sleeve. The wedge-shaped inclined surface of the wedge-shaped block faces the blocking block 74. When the sweeping frame 6 rotates, it drives the pushing member 75 to move. The pushing member 75 pushes the blocking block 74, driving the sliding mesh plate 72 to move, so that the sliding mesh plate 72 coincides with the fixed mesh plate 71, and further connects the treatment cylinder 1 and the collection box 4, so that the wastewater containing high-concentration metal particles near the collection box 4 in the treatment cylinder 1 is pumped into the collection box 4, forming a real-time recovery effect of metal particles.

[0027] A plurality of through holes are formed on both the fixed mesh plate 71 and the sliding mesh plate 72. In the initial state, the sliding mesh plate 72 and the fixed mesh plate 71 are staggered and attached to each other, and a plurality of through holes on both of them are sealed to keep the collection box 4 and the treatment cylinder 1 closed, facilitating the suction effect of the empty collection box 4 on the wastewater in the treatment cylinder 1. The maximum sliding distance of the sliding mesh plate 72 is equal to the distance between adjacent through holes on the sliding mesh plate 72 and the fixed mesh plate 71. After the sliding mesh plate 72 moves, the through holes on the two mesh plates communicate with each other, connecting the collection box 4 and the treatment cylinder 1 to facilitate a part of the wastewater in the treatment cylinder 1 to enter the collection box 4.

[0028] The return spring 73 and the telescopic spring 76 are both in a natural state initially. The elastic coefficient of the telescopic spring 76 is greater than that of the return spring 73, which facilitates the pushing member 75 to first push the blocking block 74 to drive the sliding mesh plate 72 to the limit, and then the telescopic spring 76 is compressed to the limit. After that, under the extrusion of the wedge-shaped block and the blocking block 74, the blocking block 74 presses the wedge-shaped block into the sliding sleeve along the inclined surface of the wedge-shaped block against the elastic force of the compression spring, facilitating the pushing member 75 to cross the blocking block 74 for the next sweeping operation.

[0029] A connecting pipe 41 is connected to the bottom of the collection box 4, and a solenoid valve 42 is installed on the connecting pipe 41. When the solenoid valve 42 is turned on, the wastewater containing high-concentration metal particles in the collection box 4 is discharged for convenient recycling and treatment.

[0030] An auxiliary component 8 is connected to the sweeping frame 6. The auxiliary component 8 includes a conductive block 81, a conductive ring 82, and an electromagnet group 83. The conductive block 81 is fixedly connected to the top of the sweeping frame 6. The conductive ring 82 includes a plurality of conductive sheets, and the plurality of conductive sheets are all coaxially and fixedly connected to the inner side wall of the treatment cylinder 1. The electromagnet group 83 includes a plurality of electromagnets. Some of the electromagnets are fixedly connected to the outer side wall of the treatment cylinder 1 and are located in the gap between adjacent collection boxes 4. Some of the electromagnets are fixedly connected to the outer side wall of the collection box 4. The plurality of electromagnets are electrically connected to the plurality of conductive sheets in one-to-one correspondence. The conductive block 81, the conductive ring 82, and the electromagnet group 83 are all electrically connected to an external power supply. The conductive sheet is a slide rheostat, and both ends of the slide rheostat are connected to the circuit. The conductive block 81 is electrically connected to the sliding end of the slide rheostat. The plurality of conductive sheets are arranged in series. One end of the conductive block 81 is electrically connected to the input end of the external power supply through a wire, and the other end sweeps across the sliding end of the slide rheostat as the conductive block 81 moves. Thus, when the conductive block 81 moves, the conductive sheet that is swept across is short-circuited, and the electromagnet corresponding to this part of the conductive sheet is powered off. The metal particles magnetically attracted by this electromagnet are swept by the subsequent unswept electromagnet as the electromagnet is powered off and the scraper 61 sweeps across, until the metal particles finally fall into the collection box 4, completing a collection cycle.

[0031] A control switch is installed on the inner wall of the treatment cylinder 1. The control switch is electrically connected to the conductive block 81 and the solenoid valve 42. The control switch is located between the starting and ending conductive sheets, facilitating the discharge of the wastewater containing high concentration in the collection box 4 by turning on the solenoid valve 42 after the collection box 4 and the treatment cylinder 1 are relatively closed. At the same time, the conductive block 81 is no longer electrically connected to the conductive sheet, enabling all conductive sheets to return to the conducting state again, and enabling all electromagnets to work again to magnetically attract the metal particles in the treatment cylinder 1 for the next operation.

[0032] A concentration detector is installed inside the treatment cylinder 1. The concentration detector is electrically connected to the valves on the water inlet pipe 2 and the drain pipe. After the concentration detector detects that the concentration of metal particles in the wastewater in the treatment cylinder 1 has decreased to a certain threshold, the two valves are controlled to operate, thereby realizing continuous water supply and drainage operations, and multiple cycle treatments can be carried out when the concentration of metal particles in the wastewater in the treatment cylinder 1 does not meet the standard.

[0033] When treating wastewater, the wastewater is introduced into the treatment cylinder 1 through the water inlet pipe 2. The stirring motor 31 in the stirring mechanism 3 is started. The stirring motor 31 drives the stirring blades 33 to rotate through the stirring shaft 32, centrifugally stirring the wastewater. The metal particles in the wastewater adhere to the inner wall of the treatment cylinder 1 under the centrifugal force. The rotation of the stirring shaft 32 drives the sweeping frame 6 to rotate through the linkage assembly 5. The rotation of the sweeping frame 6 drives the scraper 61 to rotate, and the rotation of the scraper 61 pushes the metal particles on the inner wall of the treatment cylinder 1 to move;

[0034] When the sweeping frame 6 rotates, it drives the conductive block 81 to move. Initially, multiple electromagnets are in the energized state, forming a magnetic attraction for the metal particles in the wastewater, causing the metal particles in the wastewater to concentrate near the inner wall of the treatment cylinder 1 and move with the conductive block 81. The conductive block 81 sweeps across the conductive sheet, causing the conductive sheet being swept to be in a short-circuit state. The electromagnet electrically connected to this conductive sheet is no longer energized, thus losing the magnetic attraction for the metal particles. These metal particles are magnetically attracted by other energized electromagnets, facilitating the movement of the metal particles driven by the scraper 61 until the metal particles move to the collection box 4. The pushing component 75 on the sweeping frame 6 pushes the blocking block 74 on the sliding mesh plate 72, overcoming the elastic force of the return spring 73 to push the sliding mesh plate 72 to move. The sliding mesh plate 72 moves to coincide with the fixed mesh plate 71, and the through holes on the two coincide, enabling the magnetically adsorbed metal particles to flow into the collection box 4 through the through holes with the water flow. After the conductive block 81 sweeps across the conductive sheet corresponding to the electromagnet on the collection box 4, the pushing component 75 overcomes the telescopic spring 76 to slide past the blocking block 74, and the sliding mesh plate 72 resets to cooperate with the fixed mesh plate 71 to close the connection between the collection box 4 and the treatment cylinder 1. At the same time, the electromagnet in the collection box 4 is de-energized and loses the magnetic attraction for the metal particles in the collection box 4, and the conductive block 81 turns on the control switch. The control switch turns on the solenoid valve 42, so that the wastewater containing a high concentration of metal particles flows into the collection pipe through the connecting pipe 41, facilitating unified collection.

[0035] In the present invention, by setting the linkage assembly 5, the sweeping frame 6, the scraper 61 and the suction assembly 7, the linkage assembly 5 transmits the power of the stirring motor 31 to the sweeping frame 6 and the scraper 61, pushing the metal particles distributed near the inner wall of the treatment cylinder 1 under the centrifugal force to near the collection box 4. The suction assembly 7 pumps the wastewater containing a high concentration of metal particles into the collection box 4 under the movement of the sweeping frame 6, achieving a real-time metal particle recovery and treatment effect. Compared with the traditional technology of separating the wastewater containing a high concentration of metal particles at the bottom through static precipitation, a continuous separation and collection effect can be formed, improving the recovery efficiency of metal particles in the wastewater;

[0036] In the present invention, by providing the auxiliary component 8, the distribution effect of metal particles in the processing cylinder 1 on the inner side wall of the processing cylinder 1 is further improved through magnetic attraction. At the same time, as the sweeping frame 6 moves, the electromagnets corresponding to the processed processing cylinder 1 are automatically powered off, so as to facilitate the further collection of metal particles in the wastewater by the electromagnets in the collection box 4, and further improve the recovery efficiency of metal particles in the wastewater.

[0037] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A wastewater treatment device for recovering metals, comprising a treatment cylinder (1), characterized in that: The top of the treatment barrel (1) is connected to a water inlet pipe (2), and the bottom is connected to a drain pipe. The treatment barrel (1) is connected to a stirring mechanism (3), and the stirring mechanism (3) comprises a stirring motor (31), a stirring shaft (32) and a stirring blade (33). The stirring motor (31) is mounted on the top of the treatment barrel (1). The output end of the stirring motor (31) is coaxially fixedly connected to the stirring shaft (32). The stirring shaft (32) passes through the top of the treatment barrel (1) and is coaxially fixedly connected to the stirring blade (33). The outside of the middle of the treatment barrel (1) is connected to a collecting box (4). The top end of the stirring shaft (32) located in the treatment barrel (1) is connected to a linkage component (5). The linkage component (5) the output end is connected to a sweeping frame (6), the top of the sweeping frame (6) is coaxially rotatably connected to the top of the processing cylinder (1), the sweeping frame (6) is fixedly connected to a scraper (61), the scraper (61) abuts against the inner wall of the processing cylinder (1) on the side away from the stirring shaft (32), a suction component (7) is connected between the collection box (4) and the processing cylinder (1), the input end of the suction component (7) is connected to the sweeping frame (6), wherein the suction component (7) is used to connect the collection box (4) and the processing cylinder (1) when the sweeping frame (6) rotates and passes through the collection box (4), the bottom of the collection box (4) is connected to a connecting pipe (41), and a solenoid valve (42) is installed on the connecting pipe (41); The suction assembly (7) comprises a fixed mesh plate (71), a sliding mesh plate (72), a return spring (73), a blocking block (74), a pushing component (75) and a telescopic spring (76); the fixed mesh plate (71) is fixedly connected in the collection box (4); an arc groove is provided on the inner side wall of the processing tube (1); the sliding mesh plate (72) is slidably connected in the arc groove; a return spring (73) is fixedly connected between one end of the sliding mesh plate (72) and the arc groove; a blocking block (74) is fixedly connected to the side of the sliding mesh plate (72) away from the collection box (4); the pushing component (75) is slidably connected to the sweeping frame (6) along the circumferential direction of the processing tube (1); a telescopic spring (76) is fixedly connected between the pushing component (75) and the sweeping frame (6); the pushing component (75) is wedge-shaped at one end close to the inner side wall of the processing tube (1), and the inclined surface of the wedge is directly opposite to the blocking block (74); The fixed mesh plate (71) and the sliding mesh plate (72) are both provided with a plurality of through holes, wherein the sliding mesh plate (72) and the fixed mesh plate (71) are staggered and fitted with each other in an initial state, and the plurality of through holes on both are sealed, wherein the maximum sliding distance of the sliding mesh plate (72) is equal to the spacing between adjacent through holes on the sliding mesh plate (72) and the fixed mesh plate (71); The return spring (73) and the telescopic spring (76) are both initially in a natural state, and the elastic coefficient of the telescopic spring (76) is greater than the elastic coefficient of the return spring (73); The sweeping frame (6) is connected to an auxiliary component (8), the auxiliary component (8) comprising a conductive block (81), a conductive ring (82) and an electromagnet group (83), the conductive block (81) being fixedly connected to the top of the sweeping frame (6), the conductive ring (82) comprising a plurality of conductive sheets, the plurality of conductive sheets being coaxially fixedly connected to the inner wall of the processing cylinder (1), the electromagnet group (83) comprising a plurality of electromagnets, some of the electromagnets being fixedly connected to the outside of the side wall of the processing cylinder (1) and being located in the gap between adjacent collection boxes (4), and some of the electromagnets being fixedly connected to the outside of the side wall of the collection box (4), the plurality of electromagnets being electrically connected to the plurality of conductive sheets in a one-to-one correspondence, and the conductive block (81), the conductive ring (82) and the electromagnet group (83) being electrically connected to an external power supply; The conductive sheet adopts a sliding rheostat, wherein both ends of the sliding rheostat are connected to a circuit, and the conductive block (81) is electrically connected to the sliding end of the sliding rheostat, wherein a plurality of conductive sheets are arranged in series, one end of the conductive block (81) is electrically connected to the input end of an external power supply via a wire, and the other end sweeps across the sliding end of the sliding rheostat as the conductive block (81) moves, so that when the conductive block (81) moves, the swept conductive sheet is short-circuited, thereby causing the electromagnet corresponding to this part of the conductive sheet to be de-energized, and the metal particles magnetically attracted by the electromagnet are magnetically attracted by the subsequent electromagnet that has not been swept as the electromagnet is de-energized and the scraper (61) sweeps across, until the metal particles finally fall into the collection box (4), completing a collection cycle.

2. A wastewater treatment device for recovering metals according to claim 1, characterized in that: The linkage assembly (5) comprises a driving gear (51), a transmission belt (52), a connecting gear (53), a connecting shaft (54), a rotating gear (55) and an inner gear ring (56); the driving gear (51) is coaxially fixedly connected to the stirring shaft (32); the connecting shaft (54) is rotatably connected to the top of the processing cylinder (1); the connecting gear (53) and the rotating gear (55) are both coaxially fixedly connected to the connecting shaft (54); the driving gear (51) and the connecting gear (53) are sleeved with the same transmission belt (52); the rotating gear (55) is meshed with an inner gear ring (56) on a side away from the stirring shaft (32); and the outer side of the inner gear ring (56) is coaxially fixedly connected to the sweeping frame (6).

3. A wastewater treatment device for recovering metals according to claim 2, characterized in that: A control switch is installed on the inner wall of the treatment cylinder (1); the control switch is electrically connected to the conductive block (81); and the control switch is electrically connected to the solenoid valve (42).

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