A heavy metal wastewater treatment device with self-circulation function

Abstract

The present invention relates to the technical field of heavy metal wastewater treatment, and in particular to a heavy metal wastewater treatment device with a self-circulation function. The present invention provides a heavy metal wastewater treatment device with a self-circulation function that can automatically perform multiple circulation treatments on heavy metal wastewater, so as to completely remove heavy metal ions in the wastewater and reduce the risk of heavy metal ion residues. A heavy metal wastewater treatment device with a self-circulation function includes an outer cylinder, an inner cylinder, a top frame and a bottom frame, etc. The outer side of the inner cylinder is connected to the outer cylinder, the outer side of the upper part of the inner cylinder is connected to the top frame, and the outer side of the lower part of the inner cylinder is detachably connected to the bottom frame. The present invention starts a second motor after the wastewater is precipitated and filtered in the inner cylinder, so that the lifting blades send the wastewater back into the inner cylinder for circulation treatment, thereby achieving the effect of being able to automatically perform multiple circulation treatments on the heavy metal wastewater, so as to completely remove heavy metal ions in the wastewater and reduce the risk of heavy metal ion residues.

Description

Technical Field

[0001] The invention relates to the technical field of heavy metal wastewater treatment, and in particular to a heavy metal wastewater treatment device with a self-circulation function. Background Art

[0002] In the process of industrial production, the discharge of heavy metal wastewater has become an increasingly serious environmental problem. Heavy metals, such as lead, mercury, cadmium, chromium, etc., are not only difficult to degrade naturally, but also accumulate in soil and water for a long time, posing a serious threat to the ecological environment and human health. These heavy metal ions may eventually enter the human body through the transmission of the food chain, causing various diseases and health problems. Therefore, the development and application of efficient heavy metal wastewater treatment equipment is of great significance to the protection of the ecological environment and human health.

[0003] A heavy metal wastewater zero discharge filtering device with the publication (announcement) number CN220339203U comprises a reaction barrel, a filter barrel is provided on one side of the reaction barrel, the reaction barrel and the filter barrel are both placed on the ground by supporting legs, a first motor is provided above the reaction barrel, a rotating shaft is provided inside the reaction barrel, the output end of the first motor is fixed to the rotating shaft, and a spiral blade and a brush are provided on the rotating shaft; the filter barrel and the reaction barrel are connected through a connecting pipe, a second motor is fixedly installed below the filter barrel, a filter element is provided in the filter barrel, the output end of the second motor is fixed to the filter element, the connecting pipe is fixedly inserted at the top of the filter element, and a water outlet is provided at the bottom of the side of the filter barrel. When in use, the heavy metal wastewater is first stirred with a chemical reagent, and then the wastewater is passed into the filter barrel to filter the heavy metal precipitate to complete the purification process of the heavy metal wastewater. However, since the device can only perform a single filtration and cannot circulate the heavy metal wastewater, the heavy metal ions in the wastewater may be incompletely removed, which increases the risk of residual heavy metal ions and easily causes environmental damage.

[0004] Therefore, a heavy metal wastewater treatment device with a self-circulation function is now developed, which can automatically perform multiple circulation treatments on heavy metal wastewater so as to completely remove heavy metal ions in the wastewater and reduce the risk of residual heavy metal ions. Summary of the invention

[0005] In order to overcome the shortcomings that heavy metal wastewater treatment devices can only perform single treatment and are unable to circulate heavy metal wastewater, which may result in incomplete removal of heavy metal ions in the wastewater, increase the risk of residual heavy metal ions, and easily cause environmental damage, the present invention provides a heavy metal wastewater treatment device with a self-circulation function that can automatically perform multiple circulation treatments on heavy metal wastewater so as to completely remove heavy metal ions in the wastewater and reduce the risk of residual heavy metal ions.

[0006] The technical solution is as follows: A heavy metal wastewater treatment device with a self-circulation function includes an outer cylinder, an inner cylinder, a top frame, a bottom frame, a discharge pipe, a primary filtration mechanism and a secondary filtration mechanism. The outer side of the inner cylinder is connected to the outer cylinder, a hollow interlayer is opened between the outer cylinder and the inner cylinder, the upper outer side of the inner cylinder is connected to the top frame, the top frame connects the inner cylinder and the hollow interlayer, the lower outer side of the inner cylinder is detachably connected to the bottom frame, the bottom frame also connects the inner cylinder and the hollow interlayer, the lower side of the inner cylinder is detachably connected to the discharge pipe, the inner cylinder is provided with a primary filtration mechanism capable of performing initial filtration of the heavy metal wastewater, and the inner cylinder is also provided with a secondary filtration mechanism capable of circulating the heavy metal wastewater.

[0007] Preferably, the primary filtering mechanism includes a protective cover, a first motor, a rotating shaft, a circular filter disc, a dirt collecting plate, a filter box and an auxiliary material pipe. The protective cover is connected to the inner side of the upper part of the inner cylinder, the first motor is connected inside the protective cover, the rotating shaft is connected to the output shaft of the first motor, the rotating shaft is a hollow structure, and a slag inlet hole is opened at the circular filter disc position, two upper and lower circular filter discs are connected inside the inner cylinder, the circular filter discs are rotatably connected to the shaft, the upper and lower parts of the rotating shaft are connected to the dirt collecting plates, the dirt collecting plates are in contact and cooperate with adjacent circular filter discs, the filter box is detachably connected to the lower part of the rotating shaft, and the auxiliary material pipe is connected to the left side of the upper part of the inner cylinder. Starting the first motor in the protective cover rotates the first motor, rotates the rotating shaft, drives the dirt collecting plate to rotate, pushes the heavy metal shielding on the circular filter disc into the hollow rotating shaft, causes the heavy metal precipitate to fall into the filter box for collection, and after the wastewater enters and is filtered by the circular filter disc, it flows into the lower part of the inner cylinder.

[0008] Preferably, the dirt collecting plate is arc-shaped to facilitate the collection of heavy metal precipitates.

[0009] Preferably, a refiltration mechanism is also included, which includes a second motor, a pinion, a large gear, an annular filter plate and a lifting paddle. The second motor is connected to the left side of the lower part of the outer cylinder, and the upper and lower parts of the second motor output shaft are connected to the pinion. The pinion is rotatably connected to the outer cylinder, and an annular filter plate is rotatably connected between the outer cylinder and the inner cylinder. Large gears are connected to the outer sides of the annular filter plates, and the large gears are meshed with adjacent pinion gears. Lifting paddles are also rotatably connected between the outer cylinder and the inner cylinder, and the annular filter plates are connected to the lifting paddles. Starting the second motor rotates the output shaft of the second motor, which causes the pinion to rotate, and the meshing movement of the pinion and the large gear causes the large gear to rotate, which causes the annular filter plate to rotate, thereby driving the lifting paddles to rotate and lifting the wastewater to the upper part of the hollow interlayer.

[0010] Preferably, a stirring mechanism is also included, which includes a stirring frame, a docking column, a sliding rod and a stirring rod. A plurality of stirring frames are connected to the motor output shaft, the lower part of the lowest stirring frame is connected to the docking column, the lower part of the docking column is slidably connected to the sliding rod, the right side of the sliding rod is a U-shaped structure, and the left side of the sliding rod is connected to the stirring rod. After starting the first motor to rotate the rotating shaft, the stirring frame on the rotating shaft is driven to rotate to stir the heavy metal wastewater, which causes the docking column to rotate, and the sliding rod rotates to drive the stirring rod to rotate. When the stirring frame and the stirring rod rotate, the heavy metal is stirred.

[0011] Preferably, a reciprocating mechanism is also included, which includes a spiral frame, a rotary valve, a bottom valve and a reset torsion spring. The spiral frame is connected to the upper side of the discharge pipe, and the spiral frame is in contact with the sliding rod. The discharge pipe is rotatably connected to the rotary valve, and the rotary valve is squeezed with the sliding rod. The upper part of the discharge pipe is connected to the bottom valve, and the bottom valve is rotatably connected to the rotary valve. A reset torsion spring is connected between the bottom valve and the rotary valve. When the sliding rod slides outward, the sliding rod contacts the rotary valve, driving the rotary valve to rotate, so that the rotary valve rotates and opens, allowing the heavy metal wastewater to flow into the bottom frame for circulation treatment.

[0012] Preferably, a convex block is provided on the rotary valve to facilitate extrusion fit with the sliding rod.

[0013] Preferably, a screening mechanism is also included, the screening mechanism includes a cross filter plate, a fixed disk and a latch, the upper part of the inner cylinder is rotatably connected to the cross filter plate, the upper right part of the inner cylinder is connected to the fixed disk, the fixed disk and the cross filter plate are rotatably connected, a latch is clamped between the cross filter plate and the fixed disk, the latch is pulled out, and the cross filter plate is rotated ninety degrees to change the filtering aperture, and the latch is inserted to fix the cross filter plate on the fixed disk.

[0014] Preferably, the cross filter plate is composed of filter plates with filter apertures of different sizes.

[0015] Preferably, a temperature control mechanism is also included, which includes a heater and a heating tube. The heater is connected to the left side of the outer tube, and the heating tube is connected inside the outer tube. The heater is connected to the heating tube, and the heater on the outer tube is started to heat the heating tube, so that the heating tube heats the heavy metal wastewater to a specified temperature.

[0016] The beneficial effects of the present invention are: 1. The present invention allows the wastewater to be precipitated and filtered in the inner drum, and then starts the second motor to lift the paddles to send the wastewater back into the inner drum for circulation treatment, thereby achieving the effect of automatically performing multiple circulation treatments on the heavy metal wastewater, so as to completely remove the heavy metal ions in the wastewater and reduce the risk of residual heavy metal ions.

[0017] 2. The present invention stirs the heavy metal wastewater by means of a stirring frame and a stirring rod, and at the same time the stirring frame knocks the inner cylinder to vibrate the inner cylinder, thereby achieving the effect of stirring the wastewater when filtering the heavy metal wastewater, accelerating the precipitation of heavy metals, and accelerating the filtering speed of the heavy metal wastewater by vibrating the inner cylinder.

[0018] 3. In the present invention, when the sliding rod slides outward, the bottom valve is closed and the rotary valve is opened, so that the wastewater is circulated and treated. When the sliding rod slides to the outermost side, the rotary valve is closed and the bottom valve is opened, so that the treated wastewater flows out from the discharge pipe, thereby achieving the effect of automatically controlling the circulation treatment and discharge of heavy metal wastewater through the cooperation of the rotary valve and the bottom valve.

[0019] 4. The present invention achieves the effect of pre-filtering the heavy metal wastewater passing through the inner cylinder through the cross filter plate when the heavy metal wastewater is passed into the inner cylinder, thereby preventing large impurities from entering the inner cylinder and causing clogging of the circular filter disc.

[0020] 5. The present invention heats the heating tube by starting the heater on the outer tube, so that the heating tube heats the heavy metal wastewater to a specified temperature, thereby achieving the effect of accelerating the precipitation of the heavy metal wastewater by controlling the temperature of the heavy metal wastewater and facilitating the separation of heavy metal ions in the wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 It is a schematic cross-sectional view of the three-dimensional structure of the present invention.

[0023] Figure 3 It is a partial three-dimensional structural schematic diagram of the present invention.

[0024] Figure 4 It is a schematic cross-sectional view of the three-dimensional structure of the primary filtering mechanism of the present invention.

[0025] Figure 5 It is a schematic cross-sectional view of the middle three-dimensional structure of the primary filtering mechanism of the present invention.

[0026] Figure 6 It is a schematic cross-sectional view of the lower three-dimensional structure of the primary filtering mechanism of the present invention.

[0027] Figure 7 It is a schematic cross-sectional view of the three-dimensional structure of the re-filtration mechanism of the present invention.

[0028] Figure 8 It is a schematic cross-sectional view of the three-dimensional structure of the stirring mechanism of the present invention.

[0029] Fig. 9 It is a schematic cross-sectional view of the lower three-dimensional structure of the stirring mechanism of the present invention.

[0030] Fig.10 It is a schematic cross-sectional view of the three-dimensional structure of the first part of the reciprocating mechanism of the present invention.

[0031] Fig.11 It is a schematic cross-sectional view of the second part of the three-dimensional structure of the reciprocating mechanism of the present invention.

[0032] Fig.12 It is a schematic cross-sectional view of the three-dimensional structure of the third part of the reciprocating mechanism of the present invention.

[0033] Fig.13 It is a schematic cross-sectional view of the three-dimensional structure of the screening mechanism and the temperature control mechanism of the present invention.

[0034] Fig.14 It is a schematic cross-sectional view of the three-dimensional structure of the screening mechanism of the present invention.

[0035] Explanation of the accompanying drawings: 0_outer cylinder, 1_inner cylinder, 2_top frame, 3_bottom frame, 4_discharging pipe, 5_primary filtering mechanism, 51_protective cover, 52_first motor, 53_rotating shaft, 54_circular filter disc, 55_dirt collecting plate, 56_filter box, 560_auxiliary material pipe, 6_re-filtration mechanism, 61_second motor, 62_small gear, 63_large gear, 64_annular filter disc, 65_lifting blade, 7_stirring mechanism, 71_stirring frame, 72_docking column, 73_sliding rod, 74_stirring rod, 8_reciprocating mechanism, 81_screw frame, 82_rotating valve, 83_bottom valve, 84_reset torsion spring, 9_screening mechanism, 91_cross filter plate, 92_fixed plate, 93_latch, 10_temperature control mechanism, 101_heater, 102_heating tube. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] A heavy metal wastewater treatment device with self-circulation function, such as Figure 1-Figure 3 As shown, it includes an outer cylinder 0, an inner cylinder 1, a top frame 2, a bottom frame 3, a discharge pipe 4, a primary filtering mechanism 5 and a secondary filtering mechanism 6. The outer side of the inner cylinder 1 is connected to the outer cylinder 0, a hollow interlayer is opened between the outer cylinder 0 and the inner cylinder 1, the top frame 2 is connected to the outer side of the upper part of the inner cylinder 1, the top frame 2 connects the inner cylinder 1 and the hollow interlayer, the outer side of the lower part of the inner cylinder 1 is detachably connected to the bottom frame 3, the bottom frame 3 also connects the inner cylinder 1 and the hollow interlayer, the lower side of the inner cylinder 1 is detachably connected to the discharge pipe 4, the inner cylinder 1 is provided with a primary filtering mechanism 5, and the inner cylinder 1 is also provided with a secondary filtering mechanism 6.

[0038] like Figure 1 , Figure 4 , Figure 5and Figure 6 As shown, the primary filtering mechanism 5 includes a shield 51, a first motor 52, a rotating shaft 53, a circular filter disc 54, a dirt collecting plate 55, a filter box 56 and an auxiliary material pipe 560. The shield 51 is connected to the inner side of the upper part of the inner cylinder 1, and the first motor 52 is connected inside the shield 51. The rotating shaft 53 is connected to the output shaft of the first motor 52. The rotating shaft 53 is a hollow structure, and a slag inlet hole is opened at the circular filter disc 54. The inner cylinder 1 is connected with two upper and lower circular filter discs 54, and the circular filter discs 54 are rotatably connected to the shaft. The upper and lower parts of the rotating shaft 53 are connected to dirt collecting plates 55. The dirt collecting plates 55 are arc-shaped, which is convenient for collecting heavy metal precipitates. The dirt collecting plates 55 are in contact with adjacent circular filter discs 54. The filter box 56 is detachably connected to the lower part of the rotating shaft 53, and the auxiliary material pipe 560 is connected to the left side of the upper part of the inner cylinder 1.

[0039] like Figure 1 and Figure 7 As shown, a secondary filtering mechanism 6 is also included, and the secondary filtering mechanism 6 includes a second motor 61, a pinion 62, a large gear 63, an annular filter disc 64 and a lifting paddle 65. The second motor 61 is connected to the left side of the lower part of the outer cylinder 0, and the upper and lower parts of the output shaft of the second motor 61 are connected to the pinion 62. The pinion 62 is rotatably connected to the outer cylinder 0, and an annular filter disc 64 is rotatably connected between the outer cylinder 0 and the inner cylinder 1. The outer side of the annular filter disc 64 is connected to the large gear 63, and the large gear 63 is meshed with the adjacent pinion 62. A lifting paddle 65 is also rotatably connected between the outer cylinder 0 and the inner cylinder 1, and the annular filter disc 64 is connected to the lifting paddle 65.

[0040] When using the present invention, first move the inner cylinder 1 to the treatment area of ​​heavy metal wastewater, and then connect the inner cylinder 1 to the treatment pipeline of heavy metal wastewater, so that the pretreated wastewater enters the inner cylinder 1, and at the same time, add chemical reagents to the wastewater through the auxiliary material pipe 560, so that the chemical reagents react with the heavy metal ions in the wastewater to cause heavy metal crystals to precipitate. After the wastewater enters the inner cylinder 1, the heavy metal precipitates in the wastewater are filtered out through the circular filter disc 54, so that the heavy metal precipitates remain on the circular filter disc 54 after filtering. After filtering the wastewater, start the first motor 52 in the protective cover 51, so that the first motor 52 rotates, so that the rotating shaft 53 rotates, and drives the scale collecting plate 55 to rotate, and the heavy metal shielding on the circular filter disc 54 is pushed into the hollow rotating shaft 53, so that the heavy metal precipitates fall into the filter box 56 for collection. After the wastewater enters and is filtered by the circular filter disc 54, it flows to the lower part of the inner cylinder 1 and passes through the bottom After the top frame 2 is passed through, the wastewater flows into the hollow interlayer between the inner tube 1 and the outer tube 0, and then the second motor 61 is started to rotate the output shaft of the second motor 61, so that the small gear 62 rotates, and the meshing movement of the small gear 62 and the large gear 63 makes the large gear 63 rotate, so that the annular filter disc 64 rotates, thereby driving the lifting blade 65 to rotate, and the wastewater is lifted to the upper part of the hollow interlayer, and then re-circulated from the top frame 2 to the inner tube 1 for multiple circulation treatment. When the wastewater is lifted in the hollow interlayer, the wastewater is filtered again through the annular filter disc 64, thereby automatically performing multiple circulation treatments on the heavy metal wastewater, so as to completely remove the heavy metal ions in the wastewater and reduce the risk of residual heavy metal ions. After the heavy metal wastewater treatment is completed, the discharge pipe 4 is removed, and the heavy metal precipitate in the filter box 56 is collected, and then the bottom frame 3 is removed to collect the heavy metal precipitate in the hollow interlayer.

[0041] like Figure 1 , Figure 8 , Fig. 9 and Fig.10 As shown, a stirring mechanism 7 is also included, and the stirring mechanism 7 includes a stirring frame 71, a docking column 72, a sliding rod 73 and a stirring rod 74. Three stirring frames 71 are connected to the motor output shaft, the lower part of the lowest stirring frame 71 is connected to the docking column 72, and the lower part of the docking column 72 is slidably connected to the sliding rod 73. The right side of the sliding rod 73 is a U-shaped structure, and the left side of the sliding rod 73 is connected to the stirring rod 74.

[0042] The stirring mechanism 7 of the device can be used to stir heavy metal wastewater. After the first motor 52 is started to rotate the rotating shaft 53, the stirring frame 71 on the rotating shaft 53 is driven to rotate to stir the heavy metal wastewater, so that the docking column 72 is rotated. When the sliding rod 73 rotates, the stirring rod 74 is driven to rotate. When the stirring frame 71 and the stirring rod 74 rotate, the heavy metal is stirred, so that the heavy metal wastewater and the chemical reagent are stirred evenly and fully reacted, and at the same time, it is convenient to filter the heavy metal precipitate. When the stirring frame 71 rotates, the inner cylinder 1 is knocked to vibrate the inner cylinder 1, which drives the annular filter disc 64 and the circular filter disc 54 to vibrate, and accelerates the filtering speed of the heavy metal wastewater, thereby achieving the effect of stirring the wastewater and accelerating the precipitation of heavy metals when filtering the heavy metal wastewater, and accelerating the filtering speed of the heavy metal wastewater by vibrating the inner cylinder 1.

[0043] like Figure 1 , Fig.10 , Fig.11 and Fig.12 As shown, it also includes a reciprocating mechanism 8, which includes a spiral frame 81, a rotary valve 82, a bottom valve 83 and a reset torsion spring 84. The spiral frame 81 is connected to the upper side of the discharge pipe 4, and the spiral frame 81 is in contact with the sliding rod 73. The discharge pipe 4 is rotatably connected to the rotary valve 82, and a convex block is provided on the rotary valve 82 to facilitate the extrusion fit with the sliding rod 73. The rotary valve 82 is extruded and fit with the sliding rod 73. The upper part of the discharge pipe 4 is connected to the bottom valve 83, and the bottom valve 83 is rotatably connected to the rotary valve 82. A reset torsion spring 84 is connected between the bottom valve 83 and the rotary valve 82.

[0044] The reciprocating mechanism 8 of the device can make the stirring rod 74 reciprocate. After the first motor 52 is started, the rotating shaft 53 is rotated, so that the sliding rod 73 is rotated. Through the contact and cooperation with the spiral frame 81, the sliding rod 73 slides back and forth on the docking column 72. When the sliding rod 73 slides outward, the sliding rod 73 contacts the rotary valve 82, driving the rotary valve 82 to rotate, so that the rotary valve 82 rotates and opens, so that the heavy metal wastewater flows into the bottom frame 3 for circulation treatment. At the same time, the reset torsion spring 84 is deformed, and the bottom valve 83 is closed through the cooperation of the rotary valve 82 and the bottom valve 83. When the sliding rod 73 slides to the outermost side, the stirring rod 74 disengages from the spiral frame 81, and the reset torsion spring 84 is deformed, so that the rotary valve 82 rotates and closes, and the bottom valve 83 rotates and opens, so that the purified heavy metal wastewater is discharged from the discharge pipe, thereby playing a role in the cooperation of the rotary valve 82 and the bottom valve 83, and automatically controlling the circulation treatment and discharge of the heavy metal wastewater.

[0045] like Figure 1 and Fig.13 As shown, a screening mechanism 9 is also included, which includes a cross filter plate 91, a fixed disk 92 and a latch 93. The upper part of the inner cylinder 1 is rotatably connected to the cross filter plate 91, and the cross filter plate 91 is composed of filter plates with different filter apertures. The upper right part of the inner cylinder 1 is connected to the fixed disk 92, and the fixed disk 92 is rotatably connected to the cross filter plate 91. A latch 93 is clamped between the cross filter plate 91 and the fixed disk 92.

[0046] The screening mechanism 9 of the present device can be used to pre-filter large impurities in heavy metal wastewater. When the heavy metal wastewater is passed into the inner tube 1, the heavy metal wastewater will first pass through the cross filter plate 91, so that the cross filter plate 91 pre-filters large impurities in the heavy metal wastewater to prevent large impurities from entering the inner tube 1 and causing the circular filter disc 54 to be blocked. When the filtering aperture of the cross filter plate 91 needs to be replaced, the pin 93 is pulled out, and the cross filter plate 91 is rotated ninety degrees to replace the filtering aperture. The pin 93 is inserted to fix the cross filter plate 91 on the fixed disc 92, and the aperture of the cross filter plate 91 is replaced to adapt to different pre-filtration requirements of heavy metal wastewater.

[0047] like Figure 1 and Fig.14 As shown, a temperature control mechanism 10 is also included. The temperature control mechanism 10 includes a heater 101 and a heating tube 102. The heater 101 is connected to the left side of the outer tube 0, and the heating tube 102 is connected inside the outer tube 0. The heater 101 is connected to the heating tube 102.

[0048] The temperature control mechanism 10 of the device can be used to control the temperature of heavy metal wastewater. After the heavy metal wastewater enters the inner tube 1, the heater 101 on the outer tube 0 is started to heat the heating tube 102, so that the heating tube 102 heats the heavy metal wastewater to a specified temperature, thereby playing a role in accelerating the precipitation of the heavy metal wastewater by controlling the temperature of the heavy metal wastewater and facilitating the separation of heavy metal ions in the wastewater.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heavy metal wastewater treatment device with self-circulation function, characterized in that: The invention comprises an outer cylinder (0), an inner cylinder (1), a top frame (2), a bottom frame (3), a discharge pipe (4), a primary filtering mechanism (5) and a secondary filtering mechanism (6); the outer side of the inner cylinder (1) is connected to the outer cylinder (0); a hollow interlayer is provided between the outer cylinder (0) and the inner cylinder (1); the outer side of the upper part of the inner cylinder (1) is connected to the top frame (2); the top frame (2) is connected to the inner cylinder (1) and the hollow interlayer; the outer side of the lower part of the inner cylinder (1) is detachably connected to the bottom frame (3); the bottom frame (3) is also connected to the inner cylinder (1) and the hollow interlayer; the lower side of the inner cylinder (1) is detachably connected to the discharge pipe (4); the inner cylinder (1) is provided with a primary filtering mechanism (5) capable of performing primary filtering on heavy metal wastewater; and a secondary filtering mechanism (6) capable of performing cyclic treatment on heavy metal wastewater is provided between the outer cylinder (0) and the inner cylinder (1); The primary filtering mechanism (5) comprises a protective cover (51), a first motor (52), a rotating shaft (53), a circular filter disc (54), a dirt collecting plate (55), a filter box (56) and an auxiliary material pipe (560). The protective cover (51) is connected to the inner side of the upper part of the inner cylinder (1). The first motor (52) is connected inside the protective cover (51). The output shaft of the first motor (52) is connected to the rotating shaft (53). The rotating shaft (53) is a hollow structure and has a slag inlet hole at the circular filter disc (54). The inner cylinder (1) is connected to two upper and lower circular filter discs (54). The circular filter discs (54) are both rotatably connected to the shaft. The upper and lower parts of the rotating shaft (53) are both connected to the dirt collecting plate. The dirt collecting plate (55) and the dirt collecting plate (55) are both in contact with and cooperate with the adjacent circular filter disc (54); the lower part of the rotating shaft (53) is detachably connected to a filter box (56); the upper left part of the inner cylinder (1) is connected to an auxiliary material pipe (560); the first motor (52) in the protective cover (51) is started to rotate the first motor (52), so that the rotating shaft (53) rotates, driving the dirt collecting plate (55) to rotate, pushing the heavy metal shielding on the circular filter disc (54) into the hollow rotating shaft (53), so that the heavy metal precipitate falls into the filter box (56) for collection, and after the wastewater enters and is filtered by the circular filter disc (54), it flows into the lower part of the inner cylinder (1); The invention also comprises a secondary filtering mechanism (6), which comprises a second motor (61), a pinion (62), a large gear (63), an annular filter disc (64) and a lifting blade (65). The second motor (61) is connected to the left side of the lower part of the outer cylinder (0). The upper and lower parts of the output shaft of the second motor (61) are both connected to the pinion (62). The pinion (62) is rotatably connected to the outer cylinder (0). The annular filter disc (64) is rotatably connected between the outer cylinder (0) and the inner cylinder (1). The outer side of the annular filter disc (64) is connected to the large gear (63). The wheels (63) are all meshed with adjacent pinion gears (62); a lifting blade (65) is also rotatably connected between the outer cylinder (0) and the inner cylinder (1); the annular filter discs (64) are all connected with the lifting blades (65); the second motor (61) is started to rotate the output shaft of the second motor (61), thereby rotating the pinion gear (62); the meshing movement of the pinion gear (62) and the large gear (63) causes the large gear (63) to rotate, thereby rotating the annular filter disc (64), thereby driving the lifting blades (65) to rotate, and lifting the wastewater to the upper part of the hollow interlayer; The stirring mechanism (7) further comprises a stirring frame (71), a docking column (72), a sliding rod (73) and a stirring rod (74); a plurality of stirring frames (71) are connected to the motor output shaft; the lower part of the lowest stirring frame (71) is connected to the docking column (72); the lower part of the docking column (72) is slidably connected to the sliding rod (73); the right side of the sliding rod (73) is a U-shaped structure; the left side of the sliding rod (73) is connected to the stirring rod (74); after the first motor (52) is started to rotate the rotating shaft (53), the stirring frame (71) on the rotating shaft (53) is driven to rotate, and the heavy metal wastewater is stirred, so that the docking column (72) is rotated, and the sliding rod (73) is rotated to drive the stirring rod (74) to rotate; when the stirring frame (71) and the stirring rod (74) rotate, the heavy metal is stirred; The invention also comprises a reciprocating mechanism (8), the reciprocating mechanism (8) comprising a spiral frame (81), a rotary valve (82), a bottom valve (83) and a reset torsion spring (84); the spiral frame (81) is connected to the upper side of the discharge pipe (4); the spiral frame (81) is in contact with the sliding rod (73); the discharge pipe (4) is rotatably connected to the rotary valve (82); the rotary valve (82) is extruded and matched with the sliding rod (73); the upper part of the discharge pipe (4) is connected to the bottom valve (83); the bottom valve (83) is rotatably connected to the rotary valve (82); a reset torsion spring (84) is connected between the bottom valve (83) and the rotary valve (82); when the sliding rod (73) slides outward, the sliding rod (73) contacts the rotary valve (82), drives the rotary valve (82) to rotate, and causes the rotary valve (82) to rotate and open, so that the heavy metal wastewater flows into the bottom frame (3) for circulation treatment.

2. A heavy metal wastewater treatment device with self-circulation function according to claim 1, characterized in that: The scale collecting plate (55) is arc-shaped, which is convenient for collecting heavy metal sediments.

3. A heavy metal wastewater treatment device with self-circulation function according to claim 2, characterized in that: The rotary valve (82) is provided with a protrusion to facilitate extrusion fit with the sliding rod (73).

4. A heavy metal wastewater treatment device with self-circulation function according to claim 3, characterized in that: The device also comprises a screening mechanism (9), the screening mechanism (9) comprising a cross filter plate (91), a fixed disk (92) and a latch (93), the upper portion of the inner cylinder (1) being rotatably connected to the cross filter plate (91), the upper right portion of the inner cylinder (1) being connected to the fixed disk (92), the fixed disk (92) being rotatably connected to the cross filter plate (91), a latch (93) being clamped between the cross filter plate (91) and the fixed disk (92), the latch (93) being pulled out, the cross filter plate (91) being rotated 90 degrees, the filtration aperture being changed, and the latch (93) being inserted, the cross filter plate (91) being fixed to the fixed disk (92).

5. The heavy metal wastewater treatment device with self-circulation function according to claim 4 is characterized in that: The cross filter plate (91) is composed of filter plates with filter apertures of different sizes.

6. The heavy metal wastewater treatment device with self-circulation function according to claim 5 is characterized in that: The invention also comprises a temperature control mechanism (10), the temperature control mechanism (10) comprising a heater (101) and a heating tube (102), the heater (101) being connected to the left side of the outer tube (0), the heating tube (102) being connected inside the outer tube (0), the heater (101) being connected to the heating tube (102), and the heater (101) on the outer tube (0) being started to heat the heating tube (102), so that the heating tube (102) heats the heavy metal wastewater to a specified temperature.

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