Soil screening and grading equipment for reduction treatment of heavy metal contaminated soil

Abstract

The soil screening and grading equipment comprises a main grading device, the top of the main grading device is fixedly connected with a rear material box, the front face of the rear material box is fixedly connected with a water storage tank, and a water injection opening is formed in the top of the water storage tank; a dial gauge is fixedly connected to the side face of the water storage tank, a water tank switch is fixedly connected to the side face of the water storage tank, high-pressure spray heads are fixedly connected to the bottom of the water storage tank, adjusting valves are movably connected to the interiors of the high-pressure spray heads, and the high-pressure spray heads are distributed at the bottom of the water storage tank at equal intervals; according to the soil screening and grading equipment for reduction treatment of the heavy metal contaminated soil, water is sprayed out through a high-pressure spray head, the water can wash downwards through the inclined face of the main grading device, soil blocking the surface of a screen is washed down, and the situation that the grading effect becomes poor due to the fact that the screen is blocked when the soil is screened is prevented; soil which cannot be classified can flow into the waste box, and collection is convenient and fast.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental engineering soil treatment, and specifically relates to a soil screening and grading device for the reduction treatment of heavy metal contaminated soil. Background Art

[0002] With the rapid development of industrialization, the development of mineral resources, the use of various chemical products, and improper treatment of "three wastes" have led to a large amount of industrial wastewater, waste gas, and waste residue entering the soil through various channels, resulting in serious heavy metal pollution in the soil. In particular, the farmland soil near industrial areas and living areas is more serious. Therefore, it is necessary to repair the heavy metal pollution of the soil to ensure that the soil can supply healthy crops for humans.

[0003] The patent document with the publication number CN222240475 in the prior art provides: A soil grading and screening device for monitoring, including a soil crushing device, a grading and screening device, and a sample collection device. The soil crushing device includes a barrel-shaped housing fixed on a support frame; a motor is installed below the housing, blades connected to the motor are arranged inside, an impurity discharge port and a soil discharge port are respectively arranged on the side, and a closed cover is arranged on the top; the grading and screening device includes a cavity composed of a bottom plate with legs, baffles I arranged on both sides of the bottom plate, a screening plate arranged obliquely, a horizontal plate connected to the end of the screening plate, and a sealing cover connected to the baffle I; a sample collection device is arranged inside the cavity; the screening plate is composed of screening sections I - III and a buffer section; buffer sections are arranged between screening section I and screening section II, and between screening section II and screening section III; the front end of screening section I is connected to the soil discharge port; a waste box is arranged below the front of the horizontal plate. The utility model can meet the multi-level screening requirements and improve the soil sample preparation efficiency.

[0004] Although this device has many beneficial effects, there are still the following problems: When screening heavy metal contaminated soil, the screening device uses hierarchical screening. During the screening process, there will inevitably be soil with high humidity, which may adhere to the surface of each screen during the downward screening process. After long-term use, the soil may dry and adhere to the screen, resulting in poor screening quality and affecting the screening effect of contaminated soil. Secondly, the heavy metal contaminated soil will inevitably be mixed with some other substances, and it is also difficult for the screen to screen soil particles with larger particle sizes. These particles and impurities will be separately screened into a waste box. The weight of these collected wastes plus the weight of the waste box is relatively large, and additional manual treatment is required, which is relatively laborious during transportation and movement. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this section, the abstract, and the title. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] 1. Technical problems to be solved:

[0007] In order to solve the problems existing above, when screening heavy metal contaminated soil, the screening device uses hierarchical screening. Inevitably, there will be soil with high humidity during the screening process. During the process of screening down to the lower levels, it may adhere to the surface of each screen. After long-term use, the soil may dry and adhere to the screen, resulting in poor screening quality and affecting the effect of screening contaminated soil. Heavy metal contaminated soil will inevitably be mixed with some other substances, and it is also difficult for the screen to screen soil particles with larger particle sizes. These particles and impurities will be separately screened into a waste bin. The weight of the collected waste plus the weight of the waste bin is relatively large, requiring manual extra processing and being laborious during transportation and movement. The present invention is proposed.

[0008] Therefore, the purpose of the present invention is to provide a soil screening and grading device for the reduction treatment of heavy metal contaminated soil. A water storage tank is provided inside the main grading device. When it is necessary to treat the soil adhering to the screen surface, each grading drawer needs to be pulled out in advance to prevent water from entering the inside of the grading drawer. At the same time, by opening the water tank switch, the high-pressure nozzle can spray the water inside the water storage tank, and the water output of each high-pressure nozzle can also be adjusted through a regulating valve. When the blockage is relatively serious, the flow rate can be adjusted to be relatively large. The water sprayed by the high-pressure nozzle flows downward along the inclined surface of the main grading box body, flushing each screen and washing away the soil adhering to the screen. The flushed sewage will directly flow into the sewage bin at the bottom, facilitating the collection and centralized treatment of the sewage. Secondly, universal wheels are movably connected to the bottom of the waste bin. During the process of screening heavy metal soil, various impurities will also be screened out and sent into the waste bin. When the waste bin is filled, the waste bin is taken out through the cooperation of the sliding plate and the first sliding groove. After taking it out, the push-pull handle is pulled to drive the connecting rod to exert force, thereby driving the waste bin to move, facilitating the transportation and movement of the waste to a designated place for limited treatment, and the transportation is relatively convenient.

[0009] 2. Technical solutions:

[0010] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0011] A soil screening and grading device for the reduction treatment of heavy metal contaminated soil, including a main grading device. A rear material box is fixedly connected to the top of the main grading device. A water storage tank is fixedly connected to the front of the rear material box. A support frame is fixedly connected to the bottom of the water storage tank. A water injection port is opened at the top of the water storage tank. A scale is fixedly connected to the side of the water storage tank. A water tank switch is fixedly connected to the side of the water storage tank. A high-pressure spray head is fixedly connected to the bottom of the water storage tank. A regulating valve is movably connected inside the high-pressure spray head. The high-pressure spray heads are evenly distributed at the bottom of the water storage tank.

[0012] As a preferred scheme of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil in the present invention, a fixing plate is fixedly connected to the front of the main grading device. A first sliding groove is opened inside the fixing plate. A sliding plate is slidably connected inside the first sliding groove. A waste box is fixedly connected to the side of the sliding plate. A fixing rod is fixedly connected to the front of the waste box. The two sides of the fixing rod are connected to a connecting plate through a turntable. The side of the connecting plate is connected to a push-pull handle through a turntable. A universal wheel is movably connected to the bottom of the waste box.

[0013] As a preferred scheme of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil in the present invention, a bottom plate is fixedly connected to the bottom of the main grading device. Foot supports are fixedly connected to the four corners of the bottom of the main grading device.

[0014] As a preferred scheme of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil in the present invention, two driving motors are fixedly connected to the top of the bottom plate. A vertical rod is connected to the top of the driving motor through a turntable. A spiral blade is fixedly connected to the surface of the vertical rod.

[0015] As a preferred scheme of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil in the present invention, a rear baffle is connected to the back of the main grading device through a rotating shaft. A first baffle handle is fixedly connected to the front of the rear baffle. A first magnetic attraction block is fixedly connected to the top of the rear baffle. The surface of the first magnetic attraction block is magnetically connected inside a first magnetic attraction buckle. The back of the first magnetic attraction buckle is fixedly connected to the back of the main grading device.

[0016] As a preferred embodiment of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention, the vertical rod penetrates through the bottom of the rear material box. The back of the rear material box is connected to a top baffle through a rotating shaft. A second magnetic block is fixedly connected to the front of the top baffle. The surface of the second magnetic block is magnetically connected inside a second magnetic buckle. The back of the second magnetic buckle is fixedly connected to the front of the rear material box. A second baffle handle is fixedly connected to the top of the top baffle.

[0017] As a preferred embodiment of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention, an outlet is provided on the front of the rear material box. A guide plate is fixedly connected to the front of the rear material box, and the guide plate penetrates through the front of the rear material box.

[0018] As a preferred embodiment of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention, side baffles are fixedly connected to the top of the main grading device. Three installation slots are provided on the top of the main grading device, and a screen frame can be installed inside the installation slots.

[0019] As a preferred embodiment of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention, a primary screen, a secondary screen, and a tertiary screen can be respectively fixedly connected inside the screen frame. A screen handle is fixedly connected to the top of the screen frame. The small hole diameters of the primary screen, the secondary screen, and the tertiary screen are all different.

[0020] As a preferred embodiment of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention, an inclined groove and a large receiving groove are provided inside the main grading device. Second sliding grooves are provided on both sides of the inclined groove, and a first inclined plate, a second inclined plate, and a third inclined plate can be respectively slidably connected inside the second sliding grooves. The large receiving groove can be movably connected to a sewage tank. A first pull handle is fixedly connected to the side of the sewage tank. Fourth pull handles are fixedly connected to both sides of the first inclined plate. A third pull handle is fixedly connected to the side of the second inclined plate. A second pull handle is fixedly connected to the side of the third inclined plate.

[0021] 3. Beneficial effects:

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil is provided with a water storage tank at the top of the main grading device. During long-term use of the main grading device, it is inevitable that some soil will adhere to the surfaces of the screening meshes at all levels, which will lead to a deteriorating screening effect of the screening meshes. Moreover, the drying speed of fine soil is relatively fast. After the screening is completed, first pull out each grading drawer, and then the switch of the water storage tank can be opened. Water is sprayed by the high-pressure nozzle, and the water flow will flow downward along the inclined surface of the main grading device to wash and clean the soil adhering to the screen, and then flow into the sewage bin for convenient centralized treatment. It is more convenient to clean the adhering soil;

[0024] The soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil is provided with a first chute opened inside the fixed plate. A waste box with a sliding plate fixedly connected to the side is movably connected inside the first chute. Through the waste box, those impurities or soils with larger particle sizes can be caught and accommodated during the screening process of the main grading device. When the waste box is full, the waste box can be taken out and the fertilizer can be transported to a designated location for further treatment. The transportation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0026] Figure 1 It is a schematic diagram of the overall structure of a soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the main grading device of a soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of each grading drawer of a soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to the present invention;

[0029] Figure 4 It is a schematic diagram of the back structure of the main grading device of a soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the waste box of a soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to the present invention;

[0031] Figure 6Schematic diagram of the water storage tank structure of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention;

[0032] Figure 7 Schematic diagram of the structure of the rear material box of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention;

[0033] Figure 8 Schematic diagrams of the structures of each sieve mesh of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention;

[0034] Figure 9 Schematic diagram of the structure of the drive motor of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil according to the present invention.

[0035] Explanation of the reference numerals in the figure: 1, main grading device; 2, foot support; 3, fixed plate; 4, first chute; 5, first pull handle; 6, second pull handle; 7, third pull handle; 8, fourth pull handle; 9, sewage bin; 10, first inclined plate; 11, second inclined plate; 12, third inclined plate; 13, side baffle; 14, large receiving groove; 15, inclined groove; 16, installation groove; 17, primary sieve mesh; 18, secondary sieve mesh; 19, tertiary sieve mesh; 20, sieve mesh frame; 21, sieve mesh handle; 22, rear baffle; 23, first baffle handle; 24, first magnetic block; 25, first magnetic buckle; 26, bottom plate; 27, rear material box; 28, drive motor; 29, vertical rod; 30, spiral blade; 31, top baffle; 32, second baffle handle; 33, second magnetic block; 34, second magnetic buckle; 35, discharge port; 36, guide plate; 37, sliding plate; 38, waste box; 39, fixed rod; 40, connecting plate; 41, push-pull handle; 42, universal wheel; 43, water storage tank; 44, scale; 45, water tank switch; 46, support frame; 47, high-pressure spray head; 48, regulating valve; 49, water injection port; 50, second chute. Detailed implementation manners

[0036] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings.

[0037] The present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structures will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0038] The orientation or positional relationship indicated in the terms is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0039] The connection methods in the terms should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] The embodiments of the present invention will be further described in detail below with reference to the drawings.

[0041] The present invention provides a schematic diagram of the overall structure of an embodiment of a soil screening and grading device for the reduction treatment of heavy metal contaminated soil, including:

[0042] Please refer to Figures 1-9 , a soil screening and grading device for the reduction treatment of heavy metal contaminated soil in this embodiment, includes a main grading device 1. A rear material box 27 is fixedly connected to the top of the main grading device 1. A water storage tank 43 is fixedly connected to the front of the rear material box 27. A support frame 46 is fixedly connected to the bottom of the water storage tank 43. A water injection port 49 is opened at the top of the water storage tank 43. A scale 44 is fixedly connected to the side of the water storage tank 43. A water tank switch 45 is fixedly connected to the side of the water storage tank 43. A high-pressure spray head 47 is fixedly connected to the bottom of the water storage tank 43. A regulating valve 48 is movably connected inside the high-pressure spray head 47. The high-pressure spray heads 47 are evenly distributed at the bottom of the water storage tank 43. By providing the water storage tank 43 at the top of the main grading device 1, the water tank switch 45 can be opened, and then the flow rate of each high-pressure spray head 47 can be adjusted through the regulating valve 48. The water sprayed by each high-pressure spray head 47 is used to clean the soil in the grading and screening part of the main grading device 1, preventing the soil from being blocked in each screen due to the soil particle size during the grading process, resulting in more and more blockage on the screen. Affecting the screening effect, it can also prevent the soil from drying and caking on the screen, and the cleaning effect is better.

[0043] It should be noted that in order to effectively collect waste materials and move them to a designated location for processing, specifically, a fixing plate 3 is fixedly connected to the front of the main grading device 1. A first sliding groove 4 is provided inside the fixing plate 3. A sliding plate 37 is slidably connected inside the first sliding groove 4. A waste bin 38 is fixedly connected to the side of the sliding plate 37. A fixing rod 39 is fixedly connected to the front of the waste bin 38. The two sides of the fixing rod 39 are connected to a connecting plate 40 through a turntable. The side of the connecting plate 40 is connected to a push-pull handle 41 through a turntable. The bottom of the waste bin 38 is movably connected to a universal wheel 42. When the waste bin 38 is filled with waste materials, the entire waste bin 38 can be slid out through a sliding plate, or the push-pull handle 41 can be directly pulled to take it out. With the cooperation of the universal wheel 42 at the bottom of the waste bin 38, convenient movement can be achieved, and there is no need to manually lift the waste bin 38 for transportation. The waste materials generated by screening can be transported to a designated location for processing, and the transportation process is relatively convenient.

[0044] Then, in order to stably place the device on the ground, specifically, a bottom plate 26 is fixedly connected to the bottom of the main grading device 1. Four foot supports 2 are fixedly connected to the four corners of the bottom of the main grading device 1. Through the four foot supports 2 at the four corners of the main grading device 1, the entire device can be stably supported, making its stability better.

[0045] Then, in order to transport the heavy metal contaminated soil inside the rear material box 27 to the screening system of the main grading device 1, specifically, two driving motors 28 are fixedly connected to the top of the bottom plate 26. A vertical rod 29 is connected to the top of the driving motor 28 through a turntable. A spiral blade 30 is fixedly connected to the surface of the vertical rod 29. By the rotation of the two driving motors 28, the spiral blade 30 is driven. The spiral blade 30 rotates continuously from bottom to top, thereby driving the heavy metal contaminated soil to move upward. The soil that falls directly lands on the guide plate 36 penetrating the front of the rear material box 27, so that the heavy metal contaminated soil can be transported to the main grading device 1.

[0046] At the same time, in order to protect and facilitate the maintenance of the driving motor 28, specifically, a rear baffle 22 is connected to the back of the main grading device 1 through a rotating shaft. A first baffle handle 23 is fixedly connected to the front of the rear baffle 22. A first magnetic attraction block 24 is fixedly connected to the top of the rear baffle 22. The surface of the first magnetic attraction block 24 is magnetically connected inside a first magnetic attraction buckle 25. The back of the first magnetic attraction buckle 25 is fixedly connected to the back of the main grading device 1. When maintenance and inspection are required, the rear baffle 22 can be directly pulled open through the first baffle handle, so as to repair and inspect the driving motor 28. At the same time, the rear baffle 22 also has a certain protective effect.

[0047] Meanwhile, to facilitate the filling of heavy metal contaminated soil inside the rear material box 27, specifically, the vertical rod 29 penetrates the bottom of the rear material box 27. The back of the rear material box 27 is connected to a top baffle 31 through a rotating shaft. A second magnetic attraction block 33 is fixedly connected to the front of the top baffle 31. The surface of the second magnetic attraction block 33 is magnetically connected inside the second magnetic attraction buckle 34. The back of the second magnetic attraction buckle 34 is fixedly connected to the front of the rear material box 27. A second baffle handle 32 is fixedly connected to the top of the top baffle 31. When it is necessary to fill heavy metal contaminated soil, the top baffle 31 can be opened through the second baffle handle 32, and then the heavy metal contaminated soil that needs to be classified can be filled inside it. At the same time, the top baffle 31 can be closed to prevent the heavy metal contaminated soil from raising dust due to the rotation of the driving motor 28. The top baffle 31 has a certain dust-proof effect.

[0048] Furthermore, to facilitate the transportation of heavy metal contaminated soil to the main classification equipment, specifically, a discharge port 35 is opened on the front of the rear material box 27. A guiding plate 36 is fixedly connected to the front of the rear material box 27. The guiding plate 36 penetrates the front of the rear material box 27. Through the guiding plate 36 that penetrates the front of the rear material box 27, the heavy metal contaminated soil inside the rear material box 27 can fall onto the guiding plate 36 extending inside the rear material box 27, and then freely fall onto the inclined surface of the main classification and screening device for screening treatment. The guiding is relatively convenient.

[0049] Furthermore, to enable the main classification device 1 to have a specific classification effect, specifically, side baffles 13 are fixedly connected to the top of the main classification device 1. Three installation slots 16 are opened on the top of the main classification device 1. A screen frame 20 can be installed inside the installation slots 16. Screens can be installed inside all three installation slots 16. The screens are installed in the order of small, medium, and large pore sizes from top to bottom, which is convenient for classification screening and has a good screening effect.

[0050] It should be noted that to ensure that the screen does not affect the use of the entire device, specifically, a primary screen 17, a secondary screen 18, and a tertiary screen 19 can be respectively fixedly connected inside the screen frame 20. A screen handle 21 is fixedly connected to the top of the screen frame 20. The small pore sizes of the primary screen 17, the secondary screen 18, and the tertiary screen 19 are all different. By fixedly connecting a screen handle 21 to the top of the screen frame 20 of each screen, the screen frame 20 can be removed on the main classification device 1, and individual replacement can be achieved. At the same time, the surface of the screen handle 21 facing the guiding plate 36 is provided with an inclination angle, so that the heavy metal contaminated soil is not easily stuck at the angle between the screen handle 21 and the side baffle 13, and the replacement of the screen is relatively convenient.

[0051] Finally, in order to take out the sieved soil after the sieving is completed, specifically, an inclined chute 15 and a large receiving tank 14 are provided inside the main grading device. Second chutes 50 are provided on both sides of the inclined chute 15. A first inclined plate 10, a second inclined plate 11, and a third inclined plate 12 can be respectively slidably connected inside the second chutes 50. The large receiving tank 14 can be movably connected to the sewage tank 9. A first pull handle 5 is fixedly connected to the side of the sewage tank 9. Fourth pull handles 8 are fixedly connected to both sides of the first inclined plate 10. A third pull handle 7 is fixedly connected to the side of the second inclined plate 11. A second pull handle 6 is fixedly connected to the side of the third inclined plate 12. By slidably connecting inclined plates of each level in the inclined chute 15, the heavy metal contaminated soil passing through each level of sieve mesh can directly fall to the ground through the inclined plates, facilitating the direct start of the next process. The contaminated soil has a relatively large particle size, which is convenient for distinguishing the heavy metal contaminated soil.

[0052] In addition, the circuits, electronic components, and modules involved in the present invention are all prior arts, which can be fully realized by those skilled in the art without further elaboration. The content protected by the present invention does not involve improvements to the internal structure and method either.

[0053] The device or equipment models involved in this article are as follows:

[0054] Device A: Driving motor 28: YE3160L-4-W;

[0055] Combined with Figures 1-9 , a soil sieving and grading device for reducing the quantity of heavy metal contaminated soil in this embodiment is used as follows:

[0056] 1: When using this kind of soil sieving and grading device for reducing the quantity of heavy metal contaminated soil, first, it needs to be stably placed on the ground. Through the feet 2 at the four corners of the main grading device, this device can be stably placed. After the placement is completed, the waste box 38 can be installed inside the fixed plate 3 through the sliding plate 37 and the first chute 4. At the same time, check the inside of the inclined chute 15 and the large receiving tank 14, and slidably connect the sewage tank 9 to the inside of the large receiving tank 14. Each inclined plate is respectively slid into the second chutes 50 provided on both sides of the inclined chute 15. After confirming that the combination is completed, it can be started to use.

[0057] 2: It is necessary to first fill the inner part of the rear material box with heavy metal contaminated soil that needs to be classified and screened. Open the top baffle 31 by pulling the handle 32 of the second baffle, and fill the inner part with heavy metal contaminated soil that needs to be classified. Then, promptly close the top baffle 31 to prevent dust from being emitted due to the driving motor 28 driving the spiral blade 30 to stir the heavy metal contaminated soil inside. The driving motor 28 drives the spiral blade 30 to turn the heavy metal contaminated soil at the bottom upward inside the rear material box 27, so that the soil can fall on the surface of the guide plate 36 passing through the front of the rear material box 27. At the same time, the guide plate 36 is at an inclined angle, so that the soil can flow upward along the guide plate 36 to the main classification device 1. When the soil passes through each screening mesh, it will pass through the mesh corresponding to the particle size of the soil and fall onto the corresponding inclined plate. The inclined plate has an inclined angle, which will cause the required heavy metal contaminated soil to directly fall on the ground, facilitating the direct progress of the next process and realizing full-automatic screening. Some impurities or heavy metal contaminated soil that does not meet the size requirements will directly fall into the waste box 38 along the inclined surface, and it is also more convenient to collect the waste. After the waste box 38 is filled with waste or the screening work is completed, the waste box 38 can be separately disassembled and the waste can be centrally processed;

[0058] 3: Before the screening is about to be completed, water can be injected into the water storage tank 43 in advance. After the screening is completed, it is possible to check whether there is soil attached to the surface of the screening mesh, and then take out the first inclined plate 10, the second inclined plate 11 and the third inclined plate 12 through the pull handles at all levels. Then, open the switch of the water storage tank 43, and the water flow will spray out along the high-pressure nozzle 47. The flow rate of the high-pressure nozzle 47 can also be adjusted through the regulating valve 48, so as to clean the soil attached to the screening mesh and prepare for the next use. The water flow will flow downward along the inclined surface, washing away the soil attached to the surface of the screening mesh. At the same time, the washed sewage will flow into the sewage storage. When the cleaning process is over, the sewage bin 9 can also be taken out and cleaned together. At the same time, a rear baffle 22 is also connected to the back of the main classification device 1 through a rotating shaft. When the device fails, the rear baffle 22 can be opened to repair the driving motor 28. At the same time, the rear baffle 22 also has a certain protective ability and good protective effect.

[0059] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the disclosed embodiments of the present invention can be combined with each other in any way. The exhaustive description of these combinations is not given in this specification only for the sake of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A soil screening and grading device for the reduction treatment of heavy metal contaminated soil, characterized in that, It includes a main classification device (1), a rear material box (27) is fixedly connected to the top of the main classification device (1), a water storage tank (43) is fixedly connected to the front of the rear material box (27), a support frame (46) is fixedly connected to the bottom of the water storage tank (43), a water injection port (49) is opened at the top of the water storage tank (43), a scale (44) is fixedly connected to the side of the water storage tank (43), a water tank switch (45) is fixedly connected to the side of the water storage tank (43), a high-pressure spray head (47) is fixedly connected to the bottom of the water storage tank (43), a regulating valve (48) is movably connected inside the high-pressure spray head (47), and the high-pressure spray heads (47) are evenly distributed at the bottom of the water storage tank (43).

2. The soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to claim 1, characterized in that, A fixed plate (3) is fixedly connected to the front of the main classification device (1), a first sliding groove (4) is opened inside the fixed plate (3), a sliding plate (37) is slidably connected inside the first sliding groove (4), a waste material box (38) is fixedly connected to the side of the sliding plate (37), a fixed rod (39) is fixedly connected to the front of the waste material box (38), connecting plates (40) are connected to both sides of the fixed rod (39) through turntables, a push-pull handle (41) is connected to the side of the connecting plate (40) through a turntable, and a universal wheel (42) is movably connected to the bottom of the waste material box (38).

3. The soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to claim 1, characterized in that, A bottom plate (26) is fixedly connected to the bottom of the main classification device (1), and foot supports (2) are fixedly connected to the four corners of the bottom of the main classification device (1).

4. The soil screening and grading equipment for reducing the quantity of heavy metal contaminated soil according to claim 3, characterized in that, Two driving motors (28) are fixedly connected to the top of the bottom plate (26), a vertical rod (29) is connected to the top of the driving motor (28) through a turntable, and a spiral blade (30) is fixedly connected to the surface of the vertical rod (29).

5. The soil screening and grading equipment for reducing heavy metal contaminated soil according to claim 1, characterized in that, A rear baffle (22) is connected to the back of the main classification device (1) through a rotating shaft, a first baffle handle (23) is fixedly connected to the front of the rear baffle (22), a first magnetic attraction block (24) is fixedly connected to the top of the rear baffle (22), the surface of the first magnetic attraction block (24) is magnetically connected inside a first magnetic attraction buckle (25), and the back of the first magnetic attraction buckle (25) is fixedly connected to the back of the main classification device (1).

6. The soil screening and grading equipment for reducing the amount of heavy metal contaminated soil according to claim 4, characterized in that, The vertical rod (29) penetrates through the bottom of the rear material box (27), a top baffle (31) is connected to the back of the rear material box (27) through a rotating shaft, a second magnetic attraction block (33) is fixedly connected to the front of the top baffle (31), the surface of the second magnetic attraction block (33) is magnetically connected inside a second magnetic attraction buckle (34), the back of the second magnetic attraction buckle (34) is fixedly connected to the front of the rear material box (27), and a second baffle handle (32) is fixedly connected to the top of the top baffle (31).

7. The soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to claim 1, characterized in that, An outlet (35) is opened on the front of the rear material box (27), a guide plate (36) is fixedly connected to the front of the rear material box (27), and the guide plate (36) penetrates through the front of the rear material box (27).

8. The soil screening and grading equipment for reducing the amount of heavy metal-contaminated soil according to claim 1, characterized in that, A side baffle (13) is fixedly connected to the top of the main classification device (1). Three installation grooves (16) are formed in the top of the main classification device (1), and a screen frame (20) can be installed inside the installation grooves (16).

9. The soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to claim 8, characterized in that, A primary screen (17), a secondary screen (18), and a tertiary screen (19) can be respectively and fixedly connected inside the screen frame (20). A screen handle (21) is fixedly connected to the top of the screen frame (20). The small hole diameters of the primary screen (17), the secondary screen (18), and the tertiary screen (19) are different from each other.

10. The soil screening and grading equipment for the reduction treatment of heavy metal contaminated soil according to claim 1, wherein An inclined groove (15) and a large accommodation groove (14) are formed inside the main classification device (1). Second sliding grooves (50) are formed on both sides of the inclined groove (15). A first inclined plate (10), a second inclined plate (11), and a third inclined plate (12) can be respectively slidably connected inside the second sliding grooves (50). The large accommodation groove (14) is movably connected to a sewage bin (9). A first pull handle (5) is fixedly connected to the side surface of the sewage bin (9). Fourth pull handles (8) are fixedly connected to both sides of the first inclined plate (10). A third pull handle (7) is fixedly connected to the side surface of the second inclined plate (11). A second pull handle (6) is fixedly connected to the side surface of the third inclined plate (12).

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