Heavy metal paint spraying wastewater treatment circulating system

Abstract

This invention relates to the field of wastewater treatment technology and discloses a heavy metal paint spraying wastewater treatment and circulation system, including a frame. A treatment tank for holding wastewater is assembled within the frame. The treatment tank is equipped with a feeding mechanism for adding chemical reagents. The feeding mechanism includes a support frame fixedly installed inside the treatment tank. A movable seat is rotatably mounted within the support frame, and the movable seat has a storage chamber for holding the chemical reagents. Multiple feeding pipes are rotatably mounted on the bottom of the movable seat and arranged in a circumferential array along the central axis of the movable seat. The movable seat is equipped with a feeding unit for quantitatively conveying the chemical reagents from the storage chamber to the feeding pipes. This heavy metal paint spraying wastewater treatment and circulation system effectively solves the problem in existing technologies where the feeding mechanism relies on manual control of the feeding speed and dosage, resulting in significant human error and difficulty in achieving precise quantitative reagent dispensing.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically to a wastewater treatment and recycling system for heavy metal spray painting wastewater. Background Technology

[0002] In the metal surface treatment and coating industry, the painting process generates a large amount of industrial wastewater containing heavy metal ions. This wastewater usually contains heavy metal pollutants such as copper, zinc, nickel, and chromium. If it is discharged directly without effective treatment, it will cause serious harm to the aquatic ecological environment and public health.

[0003] Currently, chemical precipitation is one of the most widely used mainstream processes for treating heavy metal ions in paint spraying wastewater. The core principle of this process is to add specific chemical agents (such as hydroxides, sulfides, chelating agents, etc.) to the wastewater, and through chemical reactions, convert the dissolved heavy metal ions in the wastewater into insoluble precipitates. Then, the precipitates are separated and removed from the water body through solid-liquid separation, thereby achieving the removal of heavy metal ions from the wastewater.

[0004] In the process of treating heavy metal paint spraying wastewater with chemical agents, existing feeding mechanisms mostly use a single fixed feeding pipe or a small number of decentralized feeding pipes for agent addition, with fixed pipe placement. Although some feeding mechanisms have attempted to add multiple sets of feeding pipes to optimize feeding uniformity, they still rely on manual control of the feeding rate and dosage, resulting in significant human error and making it difficult to achieve precise quantitative dosing of the agents. Overdosing not only wastes the agents and increases treatment costs but may also cause pH imbalance in the wastewater, leading to secondary pollution. Underdosing prevents the agents from fully reacting with heavy metal ions in the wastewater, resulting in substandard heavy metal ion removal rates. Consequently, the treated wastewater fails to meet discharge limits and cannot achieve resource recycling. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a heavy metal paint spraying wastewater treatment and recycling system, which effectively solves the problem in existing technologies where the feeding mechanism relies on manual control of the feeding speed and amount, resulting in significant human error and difficulty in achieving precise quantitative dosing of reagents.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a wastewater treatment and recycling system for heavy metal paint spraying, comprising: A frame, in which a treatment tank for holding wastewater is assembled, and an input pipe and an output pipe are fixedly connected from top to bottom on the outer circumference of the treatment tank. The processing tank is equipped with a feeding mechanism for dispensing chemical reagents. The feeding mechanism includes a support frame fixedly installed inside the processing tank. A movable seat is rotatably assembled inside the support frame, and a storage chamber for holding chemical reagents is opened in the movable seat. A feeding tube is rotatably installed at the bottom of the movable seat, and multiple feeding tubes are arranged in a circumferential array along the central axis of the movable seat. The movable seat is equipped with a feeding unit for quantitatively conveying chemical reagents from the storage chamber to the feeding tubes. The processing tank is also equipped with a drive unit for starting the feeding unit.

[0007] Furthermore, it also includes a stirring mechanism located inside the processing tank; The stirring mechanism includes a stirring shaft located inside the processing tank and extending through its top. Multiple stirring shafts are arranged in a circumferential array along the central axis of the processing tank. A power unit for driving the stirring shafts to rotate is located at the top of the processing tank.

[0008] Furthermore, the feeding unit includes a fixed block that is fixedly installed in the movable seat and extends to the liquid storage cavity, and the fixed block has a pressure cavity. The fixed block also has an input channel that communicates with the pressure cavity, and a ball is assembled in the input channel.

[0009] Furthermore, the pressure chamber is equipped with a movable block via a reset spring disposed inside it, and the movable block has an output channel, and a ball is disposed inside the output channel.

[0010] Furthermore, the movable seat has a feeding channel connected to the feeding pipe. The movable block is equipped with a feeding pipe by a mounting bracket on its outer side. One end of the feeding pipe is connected to the output channel, and the other end of the feeding pipe is connected to the feeding channel. An extrusion plate is fixedly connected to the outer circumference of the mounting bracket, and an arc-shaped block is provided on the top of the extrusion plate.

[0011] Furthermore, the drive unit includes a fixed plate fixedly connected inside the processing tank, and a spherical block that fits against the arc surface of the arc block is fixedly installed at the bottom of the fixed plate.

[0012] Furthermore, a transmission gear is fixedly connected to the outer circumference of the movable seat, and a drive gear that meshes with the transmission gear is fixedly installed on the outer circumference of one of the stirring shafts.

[0013] Furthermore, the processing tank is equipped with a gear ring through an annular plate disposed inside it, and a driven gear that meshes with the gear ring is fixedly connected to the outer circumferential surface of the feeding pipe.

[0014] The technical solution provided by this invention has the following advantages compared with the prior art: This invention includes a feeding mechanism. When the movable seat rotates and the arc-shaped block disengages from the spherical block, the return spring pushes the movable block upward, increasing the pressure chamber volume and generating negative pressure. Spherical ball one opens due to the combined effect of negative pressure and reagent hydraulic pressure, while spherical ball two closes under the influence of gravity and pressure difference. The reagent is drawn into the pressure chamber from the storage chamber. When the arc-shaped block contacts the spherical block again and presses down on the movable block, the pressure chamber volume decreases, generating positive pressure. Spherical ball one closes tightly under positive pressure, cutting off the backflow, while spherical ball two is pushed open. The reagent is squeezed into the feeding pipe through the output channel and the feeding pipe. Because the opening and closing frequency of the arc-shaped block and the compression rate of the spherical block are related... The return height of both the process and the return spring remains constant during the cycle, so the volume of reagent discharged from the pressure chamber each time is constant. Furthermore, the movable seat itself is driven by the deceleration of the active gear, carrying all the feeding tubes to rotate around the central axis of the treatment tank. Each feeding tube is equipped with a driven gear, which meshes with a gear ring fixedly installed inside the treatment tank. When the feeding tube revolves with the movable seat, the driven gear is moved by the fixed gear ring, thereby driving the feeding tube to rotate at high speed around its own axis. The centrifugal force and the linear velocity of the revolution work together to make the reagent be thrown out in an umbrella shape along the circumferential tangential direction from the outlet of the rotating feeding tube, spraying and covering the entire liquid surface. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the processing tank according to an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the feeding mechanism according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of the feeding unit according to an embodiment of the present invention; Figure 5 This is an embodiment of the present invention. Figure 4 A magnified structural diagram of part A in the middle; Figure 6 This is a three-dimensional structural diagram of the driving unit according to an embodiment of the present invention; Figure 7 This is an embodiment of the present invention. Figure 6 A magnified structural diagram of section B in the middle; Figure 8 This is a schematic diagram of the planar state transformation structure of sphere one and sphere two in an embodiment of the present invention.

[0017] The labels in the diagram represent: 1. Frame; 2. Processing tank; 21. Inlet pipe; 22. Outlet pipe; 23. Mixing mechanism; 231. Mixing shaft; 232. Power unit; 3. Feeding mechanism; 31. Support frame; 32. Movable seat; 321. Liquid storage chamber; 322. Feeding channel; 33. Feeding pipe; 34. Feeding unit; 341. Fixed block; 342. Pressure chamber; 343. Inlet channel; 34 4. Sphere 1; 345. Return spring; 346. Movable block; 347. Output channel; 348. Sphere 2; 349. Mounting bracket; 3491. Feeding pipe; 3492. Extrusion plate; 3493. Arc block; 35. Drive unit; 351. Fixed plate; 3511. Spherical block; 352. Transmission gear; 353. Drive gear; 354. Ring plate; 355. Gear ring; 356. Driven gear. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments.

[0020] Example: Please see Figures 1-8 This invention provides a technical solution: a heavy metal paint spraying wastewater treatment and recycling system, comprising: The frame 1 is equipped with a treatment tank 2 for holding sewage. The outer circumference of the treatment tank 2 is connected to an input pipe 21 and an output pipe 22 from top to bottom. The processing tank 2 is equipped with a feeding mechanism 3 for dispensing chemical reagents. The feeding mechanism 3 includes a support frame 31 fixedly installed inside the processing tank 2. A movable seat 32 is rotatably mounted inside the support frame 31, and a storage chamber 321 for holding chemical reagents is opened in the movable seat 32. A feeding pipe 33 is rotatably installed at the bottom of the movable seat 32, and multiple feeding pipes 33 are arranged in a circular array along the central axis of the movable seat 32. The movable seat 32 is equipped with a feeding unit 34 for quantitatively conveying the chemical reagents in the storage chamber 321 to the feeding pipes 33. The bottom of the storage chamber 321 adopts a conical structure design, and its inner wall is inclined in a converging manner towards the inlet of the input channel 343. Under the action of gravity, the chemical reagents will naturally flow and gather towards the low potential energy area, providing a continuous and unique flow guide surface for the reagents, ensuring that the reagents in the storage chamber 321 can always converge towards the inlet of the input channel 343 without residue. The processing tank 2 is also equipped with a drive unit 35 for starting the feeding unit 34.

[0021] It also includes a stirring mechanism 23 located inside the processing tank 2; The stirring mechanism 23 includes a stirring shaft 231 located inside the processing tank 2 and extending through its top. Multiple stirring shafts 231 are provided and arranged in a circumferential array along the central axis of the processing tank 2. A power unit 232 for driving the stirring shafts 231 to rotate is provided on the top of the processing tank 2.

[0022] The feeding unit 34 includes a fixed block 341 fixedly installed in the movable seat 32 and extending to the liquid storage chamber 321. A pressure chamber 342 is formed within the fixed block 341, and an input channel 343 communicating with the pressure chamber 342 is also formed within the fixed block 341. A ball 344 is fitted inside the input channel 343. A movable block 346 is fitted into the pressure chamber 342 via a return spring 345 disposed therein. An output channel 347 is formed within the movable block 346, and a ball 348 is fitted inside the output channel 347. When the movable block 346 moves upward, the volume of the pressure chamber 342 increases, generating negative pressure within the chamber. Under the action of its own weight and the internal and external pressure difference, the ball 348 tightly closes the output channel 347, blocking the liquid outlet path. The positive pressure liquid in the liquid storage chamber 321 pushes the ball 344 away. The valve seat opens the inlet channel 343, allowing the reagent to enter the pressure chamber 342. The movable block 346 moves down, reducing the volume of the pressure chamber 342 and causing a sudden increase in pressure inside the chamber. The high-pressure fluid presses the ball 344 tightly against the valve port of the inlet channel 343, achieving input-side cutoff and preventing reagent backflow. At the same time, the high pressure pushes the ball 348 open, opening the outlet channel 347, thus blocking the corrosive gases, water vapor, etc. inside the treatment tank 2 from the pressure chamber 342 and the storage chamber 321.

[0023] The movable seat 32 has a feeding channel 322 connected to the feeding pipe 33. The movable block 346 is equipped with a feeding pipe 3491 via a mounting bracket 349 on its outer side. One end of the feeding pipe 3491 is connected to the output channel 347, and the other end is connected to the feeding channel 322. An extrusion plate 3492 is fixedly connected to the outer circumference of the mounting bracket 349, and an arc-shaped block 3493 is provided on the top of the extrusion plate 3492. The movable seat 32 has an integrated injection port that communicates with the liquid storage chamber 321, used for... The chemical reagent replenishment interface, the storage chamber 321 is constructed with a rated volume. This rated volume is pre-calibrated based on the maximum preset sewage capacity of the treatment tank 2 in a single treatment cycle and the theoretical addition ratio of chemical reagents to the target heavy metal ions in the sewage. Furthermore, the rated volume of the storage chamber 321 is greater than or equal to the total amount of chemical reagents required for the preset amount of sewage in the treatment tank 2, which ensures that there are sufficient chemical reagents in the chamber. This avoids downtime for replenishment due to reagent depletion during the treatment process and ensures the continuity and integrity of single-batch sewage treatment.

[0024] The drive unit 35 includes a fixed plate 351 fixedly connected inside the processing tank 2, and a spherical block 3511 that fits against the arc surface of the arc block 3493 is fixedly installed on the bottom of the fixed plate 351.

[0025] A transmission gear 352 is fixedly connected to the outer circumference of the movable seat 32. A drive gear 353 that meshes with the transmission gear 352 is fixedly installed on the outer circumference of one of the stirring shafts 231. The drive gear 353 on the stirring shaft 231 drives the transmission gear 352 on the movable seat 32 to rotate. Based on the transmission ratio design between the two, the small gear drives the large gear to reduce the speed reduction transmission, thereby reducing the frequency of reagent feeding. Combined with the slow revolution of the feeding pipe 33 driven by the movable seat 32, the reagent that falls into the sewage in one feeding is discharged again in the next feeding. Before it arrives, there is a longer time interval for the water flow driven by the stirring shaft 231 to disperse and transport, and to fully contact the heavy metal ions. In addition, each time the arc block 3493 and the spherical block 3511 come into contact, mechanical collision and instantaneous squeezing friction will occur. The reduced rotation speed directly reduces the number of contact impacts between the two per unit time. At the same time, due to the transmission ratio amplifying the output torque, the force driving the arc block 3493 to climb and squeeze the spherical block 3511 is more "smooth", and the action process tends to be smooth, effectively slowing down the wear rate of the arc surface of the arc block 3493 and the spherical block 3511.

[0026] The processing tank 2 is equipped with a gear ring 355 via an internal ring plate 354. A driven gear 356, meshing with the gear ring 355, is fixedly connected to the outer circumference of the feeding pipe 33. When the movable seat 32 carries the feeding pipe 33 and revolves, the driven gear 356 rolls on the fixed gear ring 355, thereby driving each feeding pipe 33 to revolve around the center of the movable seat 32 while also rotating around its own axis. This combined rotational motion ensures that when the chemical reagent is ejected from the outlets of multiple feeding pipes 33, it is evenly sprayed into the processing tank 2 along the circumferential tangential direction.

[0027] Working principle and advantages of this heavy metal paint spraying wastewater treatment and recycling system: Chemical precipitation is a widely used process for treating heavy metal ions in wastewater from heavy metal painting. The basic principle of this process is to add specific chemical reagents, such as hydroxides, sulfides, or chelating agents, to the wastewater to convert dissolved heavy metal ions into insoluble precipitates. The precipitates are then removed from the water body through solid-liquid separation, thereby purifying the wastewater.

[0028] The operator first transports the wastewater that has been treated by the upper stage into the treatment tank 2 through the input pipe 21 on the treatment tank 2. When the wastewater content in the treatment tank 2 reaches the preset value, the operator stops adding wastewater into the treatment tank 2.

[0029] Aspiration stroke: After the system is started, the power unit 232 drives the stirring shaft 231 to rotate. Through the meshing of the transmission gear 352 and the drive gear 353, the movable seat 32 is driven to rotate within the support frame 31. The support frame 31 is fixedly installed inside the processing tank 2 and will not rotate, thus providing a basis for the stable rotation of the movable seat 32.

[0030] During the rotation of the movable seat 32, the arc-shaped block 3493 mounted on the mounting bracket 349 of the movable block 346 and the spherical block 3511 mounted on the fixed plate 351 gradually separate from the contact state. At this time, the previously compressed return spring 345, under the action of elastic restoring force, pushes the movable block 346 to return to its original position along its axis. The upward movement of the movable block 346 increases the volume of the space formed by it and the pressure chamber 342 of the fixed block 341, thereby forming an instantaneous negative pressure in the pressure chamber 342. Under the action of this negative pressure, the second sphere 348 tightly closes the output channel 347 under the combined action of its own gravity and pressure difference. At the same time, the hydraulic pressure generated by the chemical reagent in the liquid storage chamber 321 is greater than the negative pressure in the pressure chamber 342, forcing the first sphere 344 to open the input channel 343, thereby quantitatively drawing in the chemical reagent in the liquid storage chamber 321 and filling the pressure chamber 342, preparing for the next discharge stroke.

[0031] Schedule: As the movable seat 32 continues to rotate, the arc surface of the arc block 3493 comes into contact with the spherical block 3511 again, generating relative compression. The force applied by the spherical block 3511 is transmitted to the movable block 346 through the arc block 3493, the compression plate 3492, and the mounting bracket 349, overcoming the elastic threshold of the return spring 345 and forcing the movable block 346 to move downward along the axis. The movable block 346 is compressed into the pressure chamber 342, causing the volume of the pressure chamber 342 to decrease sharply and the fluid pressure inside the chamber to increase sharply. Under this positive pressure, the first ball 344 is pressed tightly against the valve port of the input channel 343 to form a seal, blocking the backflow of reagent; at the same time, the high-pressure reagent pushes open the second ball 348, opening the output channel 347. The chemical reagent that has been quantitatively retained in the pressure chamber 342 is transported to the feeding pipe 33 through the opened output channel 347, the flexible feeding pipe 3491, and the feeding channel 322 in sequence.

[0032] It is worth noting that sphere 1 344 and sphere 2 348, together with the input channel 343 and the output channel 347, can form a "one-way valve mechanism". When the movable block 346 moves upward, the volume of the pressure chamber 342 increases, and a negative pressure is generated in the chamber. Under the action of its own gravity and the internal and external pressure difference, sphere 2 348 tightly closes the output channel 347, blocking the liquid outlet path. At the same time, the positive pressure liquid in the liquid storage chamber 321 pushes sphere 1 344 away from the valve seat, opens the input channel 343, and the reagent enters the pressure chamber 342. At this time, the liquid path only allows flow from the storage chamber 321 to the pressure chamber 342, and the outlet channel is physically locked. The movable block 346 moves down, the volume of the pressure chamber 342 decreases, and the pressure inside the chamber increases sharply. The high-pressure fluid presses the ball 344 tightly against the valve of the inlet channel 343, achieving input-side cutoff and preventing reagent backflow. At the same time, the high pressure pushes open the ball 348, opening the outlet channel 347. The reagent enters the feed pipe 33 through the feed pipe 3491 and the feed channel 322. At this time, the liquid path only allows flow from the pressure chamber 342 to the feed pipe 33, and the inlet channel is physically locked. The gaseous environment inside the treatment tank 2 (which may contain corrosive gases, water vapor, etc.) is absolutely blocked from the feed liquid path (pressure chamber 342, storage chamber 321, flexible feed pipe 3491, etc.). Even if pressure fluctuations or foam rise due to chemical reactions occur inside the treatment tank 2, they cannot penetrate the mechanical seal and enter the feed system in reverse.

[0033] Through the continuous rotation of the movable seat 32, the arc-shaped block 3493 and the spherical block 3511 periodically come into contact and separate, driving the movable block 346 to perform reciprocating linear motion in the pressure chamber 342. This allows the movable block 346 to draw from the liquid storage chamber 321 and deliver a constant volume of chemical reagent with each cycle, thereby achieving intermittent, high-precision quantitative addition of chemical reagent.

[0034] During this cycle, the movable block 346 performs reciprocating linear motion within the pressure chamber 342 to create alternating volume changes. To accommodate this dynamic displacement, the feed pipe 3491 connecting the output channel 347 and the feed channel 322 is made of flexible material. Since one end of the feed pipe 3491 is connected to the movable block 346 performing reciprocating linear motion, and the other end is connected to the stationary feed channel 322, a rigid connection would completely constrain the displacement of the movable block 346, leading to jamming or damage to the mechanism. The feed pipe 3491, made of flexible material, can compensate for the displacement difference by its own elastic bending or stretching when relative displacement occurs at both ends, thereby effectively avoiding motion interference and ensuring the smooth execution of the "liquid suction-liquid discharge" reciprocating cycle of the movable block 346, thus ensuring the structural reliability of the intermittent, quantitative conveying function.

[0035] The bottom of the liquid storage chamber 321 adopts a conical structure design, and its inner wall slopes towards the inlet of the input channel 343 in a converging manner. Under the action of gravity, chemical reagents will naturally flow and gather towards the low potential energy area. The conical bottom design utilizes this principle to provide a continuous and unique flow guide surface for the reagents, ensuring that the reagents in the liquid storage chamber 321 can always converge towards the inlet of the input channel 343 without residue. This avoids the failure of "air suction" caused by the input channel 343 sucking in air due to the liquid level being too low, and at the same time minimizes the dead volume residue of reagents in the liquid storage chamber 321.

[0036] Furthermore, the rotation of the stirring shaft 231 requires simultaneous sewage stirring and the rotation of the movable seat 32. If the speeds of the two loads are directly synchronized, when the viscosity of the sewage in the treatment tank 2 changes (such as an increase in sediment) causing fluctuations in the stirring power, it will directly interfere with the feeding rhythm. The deceleration transmission between the two plays a "mechanical buffering" role, allowing the feeding mechanism 3 to operate at a lower and more stable independent rhythm, which is less susceptible to interference from the instantaneous fluctuations of the load at the stirring end. This improves the feeding action's ability to resist changes in the stirring conditions and ensures that changes in the strength of the stirring effect will not lead to inaccurate feeding measurement.

[0037] The process of adding chemical reagents: In pipeline delivery methods, reagents are usually concentrated in a certain area of ​​the wastewater, making it difficult to achieve uniform mixing between the reagents and the wastewater. This results in heavy metal ions in some areas not being able to fully contact and react with the reagents, further reducing the treatment effect.

[0038] In this invention, since the driven gear 356 mounted on the outer circumference of the feeding pipe 33 is always engaged with the gear ring 355 fixed on the inner ring plate 354 of the treatment tank 2, when the movable seat 32 carries the feeding pipe 33 and revolves, the driven gear 356 rolls on the fixed gear ring 355, thereby driving each feeding pipe 33 to revolve around the center of the movable seat 32 while also rotating around its own axis. This combined rotational motion ensures that when the chemical reagent is ejected from the outlet of the feeding pipe 33, it is evenly sprayed along the circumferential tangential direction to the entire liquid surface inside the treatment tank 2, significantly expanding the initial distribution range of the reagent.

[0039] Simultaneously, multiple stirring shafts 231 arranged in a circular array, driven by the power unit 232, continuously agitate and stir the wastewater inside the tank. This not only rapidly carries the sprayed chemical reagents into the wastewater, preventing localized accumulation, but also significantly increases the probability of contact and collision between heavy metal ions and chemical reagent molecules and the reaction rate through macroscopic convection and microscopic shearing. This ensures a thorough and uniform reaction between the two, thereby efficiently generating insoluble precipitates. Ultimately, this achieves efficient and stable removal of heavy metal pollutants from continuously input paint spraying wastewater, providing a foundation for subsequent biological treatment and achieving the goal of cyclical treatment.

[0040] It is worth noting that the drive gear 353 on the stirring shaft 231 drives the transmission gear 352 on the movable seat 32 to rotate. Based on the transmission ratio design between the two, it can realize the deceleration transmission of the small gear driving the large gear. During the reciprocating movement of the movable block 346, it can be ensured that the pressure chamber 342 is completely filled with reagent each time. After the movable seat 32 decelerates, the rotation speed of the movable seat 32 slows down, so that the process of increasing the volume of the pressure chamber 342 in each "liquid suction stroke" lasts longer. The chemical reagent in the liquid storage chamber 321 has more time to fill the pressure chamber 342, avoiding the defects of "empty suction" or "air binding" caused by the liquid not having enough time to fill the pressure chamber 342 due to excessive rotation speed. This ensures that the amount of reagent squeezed out in each discharge stroke is exactly equal to the designed volume.

[0041] After heavy metal ions are removed from the wastewater, the operator can discharge the wastewater in treatment tank 2 to the next wastewater treatment unit through output pipe 22.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heavy metal paint spray wastewater treatment recycling system, characterized by, include: The frame (1) is equipped with a treatment tank (2) for holding sewage. The outer circumference of the treatment tank (2) is connected to an input pipe (21) and an output pipe (22) from top to bottom. The processing tank (2) is provided with a feeding mechanism (3) for dispensing chemical reagents. The feeding mechanism (3) includes a support frame (31) fixedly installed inside the processing tank (2). A movable seat (32) is rotatably assembled inside the support frame (31), and a storage chamber (321) for holding chemical reagents is opened inside the movable seat (32). A feeding pipe (33) is rotatably installed at the bottom of the movable seat (32), and multiple feeding pipes (33) are provided and arranged in a circular array along the central axis of the movable seat (32). The movable seat (32) is provided with a feeding unit (34) for quantitatively conveying the chemical reagents in the storage chamber (321) to the feeding pipe (33). The processing tank (2) is also equipped with a drive unit (35) for starting the feeding unit (34).

2. A heavy metal paint spray wastewater treatment recirculating system according to claim 1, wherein: It also includes a stirring mechanism (23) located inside the processing tank (2); The stirring mechanism (23) includes a stirring shaft (231) located inside the processing tank (2) and extending through its top. The stirring shaft (231) has multiple shafts and is arranged in a circular array along the central axis of the processing tank (2). The top of the processing tank (2) is provided with a power unit (232) for driving the stirring shaft (231) to rotate.

3. A heavy metal paint spray wastewater treatment recirculating system according to claim 1, wherein: The feeding unit (34) includes a fixed block (341) that is fixedly installed in the movable seat (32) and extends to the liquid storage chamber (321). The fixed block (341) has a pressure chamber (342) and an input channel (343) that communicates with the pressure chamber (342). A ball (344) is assembled in the input channel (343).

4. A heavy metal paint spray wastewater treatment recirculating system according to claim 3, wherein: The pressure chamber (342) is equipped with a movable block (346) via a reset spring (345) located inside it, and an output channel (347) is provided in the movable block (346), and a sphere (348) is provided in the output channel (347).

5. The heavy metal paint spraying wastewater treatment and recycling system according to claim 4, characterized in that: The movable seat (32) has a feeding channel (322) connected to the feeding pipe (33). The movable block (346) is equipped with a feeding pipe (3491) through a mounting bracket (349) on its outer side. One end of the feeding pipe (3491) is connected to the output channel (347), and the other end of the feeding pipe (3491) is connected to the feeding channel (322). An extrusion plate (3492) is fixedly connected to the outer circumference of the mounting bracket (349), and an arc-shaped block (3493) is provided on the top of the extrusion plate (3492).

6. The heavy metal paint spraying wastewater treatment and recycling system according to claim 5, characterized in that: The drive unit (35) includes a fixed plate (351) fixedly connected inside the processing tank (2), and a spherical block (3511) that fits against the arc surface of the arc block (3493) is fixedly installed at the bottom of the fixed plate (351).

7. The heavy metal paint spraying wastewater treatment and recycling system according to claim 2, characterized in that: A transmission gear (352) is fixedly connected to the outer circumference of the movable seat (32), and a drive gear (353) that meshes with the transmission gear (352) is fixedly installed on the outer circumference of one of the stirring shafts (231).

8. The heavy metal paint spraying wastewater treatment and recycling system according to claim 1, characterized in that: The processing tank (2) is equipped with a gear ring (355) through an annular plate (354) located inside it, and the outer circumferential surface of the feeding pipe (33) is fixedly connected with a driven gear (356) that meshes with the gear ring (355).

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