Gravity type soil screening device for soil remediation

Abstract

The invention relates to the field of soil remediation equipment. The gravity type soil screening device for soil remediation comprises an equipment body, the equipment body comprises a recycling base, the upper end of the recycling base fixedly communicates with a discharging pipe, the upper end of the discharging pipe fixedly communicates with a charging barrel, and the side face of the charging barrel is fixedly connected with a fixing box; and a discharging pipe is arranged at the lower end of the fixing box, a filter screen is fixedly connected to the interior of the charging barrel, and a through hole is formed between the charging barrel and the fixing box. According to the soil remediation device, the soil is crushed through the pressing plate, the primarily filtered soil is filtered through the filter screen again, the soil is further subdivided, and in the step, the soil can be screened more accurately according to different particle size ranges according to specific soil remediation requirements and targets, so that the requirement of a subsequent treatment process for the soil granularity is met; and under the assistance of the crushing cutter, the screening efficiency is improved, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of soil remediation equipment, and particularly to a gravity soil screening device for soil remediation. Background Art

[0002] With the rapid development of industrialization and urbanization, the problem of soil pollution has become increasingly serious. Polluted soil not only affects the growth and yield of crops, but also poses a threat to human health through the food chain. At the same time, it will also have a negative impact on the balance and stability of the ecological environment. Therefore, soil remediation has become an important research topic and practical focus in the current field of environmental protection.

[0003] The existing patent (publication number: CN106583435B) discloses a soil remediation screening device, including a box body with an upper and lower through structure. On one inner side wall of the upper part of the box body, a first screening plate is inclined downward through a first hinge member. On the other inner side wall of the lower part of the box body, a second screening plate is inclined downward through a second hinge member. One inner side wall inside the box body is parallel and opposite to the other inner side wall inside the box body; on the side wall of the box body corresponding to the discharge end of the first screening plate, a first discharge channel is opened, and the discharge end of the first screening plate exposes the first discharge channel; on the side wall of the box body corresponding to the discharge end of the second screening plate, a second discharge channel is opened, and the discharge end of the second screening plate exposes the second discharge channel. This invention provides a soil remediation screening device with remarkable screening effect, no clogging phenomenon, and no need to clean the screening holes during the screening process.

[0004] In the process of implementing the present invention, the inventor found that there are at least the following problems in the prior art:

[0005] First, the vibration mode of the vibrating screen may cause excessive fragmentation of soil particles, affecting the physical structure and properties of the soil. Moreover, for soils with relatively high viscosity or humidity, the vibrating screen is prone to clogging, reducing the screening efficiency and effect, and pressure screening is required to ensure productivity;

[0006] Second, when using extrusion-type soil screening treatment, when the soil is extruded, part of the soil will be compacted, resulting in the extruded soil being unable to be screened on the screen. Therefore, generally, after the soil is extruded, a crushing member is required to further crush the extruded soil. However, during the crushing process, due to the excessive density between the soils, the screening holes on the screen are blocked by the soil, affecting the soil screening effect;

[0007] Thirdly, when using the positive pressure and negative pressure methods to assist in screening the soil, usually during the extrusion process of the soil, the blower has already applied positive pressure and negative pressure to the soil. During the extrusion process, the soil is in a high-pressure state, and the air flow blown by the positive and negative pressures will affect the extrusion effect, resulting in the equipment having to bear additional pressure. Moreover, the positive and negative pressures have limited crushing effects on large soil particles and will interfere with the normal stress and movement of soil particles during the extrusion process, affecting the extrusion effect. Summary of the Invention

[0008] The purpose of the present invention is to provide a gravity soil screening device for soil remediation to solve the problems raised in the above-mentioned background technology. To achieve the above purpose, the present invention provides the following technical solutions: A gravity soil screening device for soil remediation, including the equipment body, the equipment body includes a recovery base, the upper end of the recovery base is fixedly communicated with a feeding pipe, the upper end of the feeding pipe is fixedly communicated with a material cylinder, the side surface of the material cylinder is fixedly connected with a fixed box, the lower end of the fixed box is provided with a discharge pipe, a filter screen is fixedly connected inside the material cylinder, a through hole is opened between the material cylinder and the fixed box, a feeding port is opened on the side of the material cylinder, and a blower is arranged inside the fixed box.

[0009] The upper surface of the material cylinder is fixedly connected with a driving motor, a driving mechanism is arranged at the lower end of the driving motor, a clutch crushing mechanism is rotatably connected inside the material cylinder, an auxiliary mechanism is arranged inside the clutch crushing mechanism, and a positive and negative pressure mechanism is rotated inside the material cylinder.

[0010] Preferably, the driving mechanism includes a sliding rod, the sliding rod is fixedly connected to the surface of the material cylinder, the lower end of the output shaft of the driving motor is fixedly connected with a threaded rod, a clamping rod is threadedly connected to the surface of the threaded rod, a sleeve is slidably connected to the surface of the sliding rod, a caliper rod is slidably connected inside the sleeve, a spring block is slidably connected inside the sleeve, a round rod is fixedly connected to the surface of the spring block, the spring block is initially stuck on the outer surface of the clamping rod, and a stop rod is fixedly connected to the surface of the material cylinder.

[0011] Preferably, the clutch crushing mechanism includes a spline rod, the spline rod is fixedly connected to the lower end of the clamping rod, a collar is spline-connected to the surface of the spline rod, a large gear is fixedly connected to the edge of the collar, the large gear is rotatably connected to the upper end inside the material cylinder, the large gear is rotatably connected to the upper end inside the material cylinder, a spring block is slidably connected inside the collar, an extrusion rod is fixedly connected to the surface of the spring block, a conical block is fixedly connected to the lower end of the spline rod, and a pressing plate is fixedly connected to the lower end of the conical block.

[0012] Preferably, a small gear is rotatably connected to the upper end inside the barrel. The large gear meshes with the small gear, and the large gear and the small gear form a gear set. When the large gear rotates, the rotation of the small gear is accelerated.

[0013] Preferably, the auxiliary mechanism includes a spring groove opened inside the pressing plate. A crushing knife is slidably connected inside the spring groove. The other side of the spring block is fixedly connected to a telescopic rod. The surface of the pressing plate is fixedly connected with an L-shaped sliding groove. A T-shaped slider is slidably connected inside the L-shaped sliding groove. Both sides of the T-shaped slider are connected with connecting rods. An L-shaped sliding groove is slidably connected with a pressing block inside, and the side of the pressing block is rotatably connected to the connecting rod.

[0014] Preferably, when the T-shaped slider moves, it will drive the pressing block to move through the connecting rod until the pressing block moves to the inner wall of the L-shaped sliding groove and is squeezed by the inner wall of the L-shaped sliding groove. At this time, the pressing block will deform through the connecting rod.

[0015] Preferably, the positive and negative pressure mechanism includes a gear disc rotatably connected to the upper surface of the barrel. A semi-gear is fixedly connected inside the gear disc. A gear is rotatably connected to the upper surface of the barrel, and a rotating shaft is fixedly connected to the surface of the gear.

[0016] Preferably, the output shaft of the semi-gear is fixedly connected to the output shaft of the small gear. Half a set of teeth are provided inside the gear disc. At the same time, when the gear disc rotates, it will drive the semi-gear to rotate. When rotating, it meshes with the gear alternately. The rotating shaft is connected to the output shaft of the fan blade to drive the fan blade to rotate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] In the present invention, the soil is crushed through two processes of being crushed by the pressing plate and the crushing knife, which is equivalent to crushing the soil in two different ways. The pressing of the pressing plate mainly causes large soil particles to break by pressure, while the crushing knife can further crush the soil by a shearing method. The combination of the two methods can make the soil particles be crushed more fully, obtaining more uniform and finer particles, so as to separate the indestructible inorganic matter particles in the soil, such as solid waste pollution and metal pollutants in the soil, thereby promoting the subsequent soil remediation operation. And during the crushing and screening process of the soil, the soil remediation liquid is continuously sprayed, so that the medicaments containing nutrients and regulating effects are evenly incorporated into the soil, fully promoting the soil remediation and realizing the environmental protection of the land.

[0019] In the present invention, the soil is crushed by a pressing plate, and the initially filtered soil is filtered again through a filter screen to further subdivide the soil. This step can more accurately screen the soil according to different particle size ranges based on specific soil remediation needs and goals to meet the soil particle size requirements of subsequent treatment processes. With the assistance of the crushing knife, the screening efficiency is accelerated and the work efficiency is improved.

[0020] In the present invention, the soil is first squeezed and then crushed. After the soil is squeezed, the pore volume is reduced, which makes the soil more compact. When the squeezed soil is further crushed by the crushing knife, the positive and negative pressures can generate airflow during the screening process, thereby improving the overall screening speed and processing more soil samples per unit time.

[0021] In the present invention, negative pressure is generated by the fan, and the negative pressure environment can reduce the resistance of the air to the soil particles to a certain extent, making the soil particles fall more easily under the action of gravity, promoting the flow of soil particles in the device, and improving the screening efficiency. At the same time, during the screening process, the negative pressure can prevent the air outside the device from carrying impurities into the device, and can also prevent the impurities that have been screened from returning to the screening area due to airflow disturbance, thereby ensuring the screening effect.

[0022] In the present invention, when the positive pressure is generated by the fan, the soil particles in the screening device are subjected to an additional thrust, which helps to overcome gravity and friction, so that the soil moves more smoothly in the device and is transported from the feed pipe to the discharge port, thereby improving the efficiency and continuity of screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional appearance structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the side cross-sectional structure of the device body of the present invention;

[0025] Figure 3 It is a partial enlarged structural diagram of the device body of the present invention;

[0026] Figure 4 Schematic diagram of the internal structure of the barrel of the present invention;

[0027] Figure 5 Schematic diagram of the driving mechanism structure of the present invention;

[0028] Figure 6 This is a partial enlarged structural diagram of the driving mechanism of the present invention. Figure 1 ;

[0029] Figure 7 This is a partial enlarged structural diagram of the driving mechanism of the present invention. Figure 2 ;

[0030] Figure 8 Schematic structural diagram of the clutch and crushing mechanism of the present invention;

[0031] Figure 9 Schematic side sectional view of the clutch and crushing mechanism of the present invention;

[0032] Figure 10 Schematic structural diagram of the auxiliary mechanism of the present invention;

[0033] Figure 11 Schematic bottom view of the positive and negative pressure mechanism of the present invention;

[0034] Figure 12 Schematic enlarged partial view of the positive and negative pressure mechanism of the present invention.

[0035] In the figure: 1, equipment body; 2, driving motor; 3, blower; 4, driving mechanism; 5, clutch and crushing mechanism; 6, auxiliary mechanism; 7, positive and negative pressure mechanism; 8, feeding port; 11, recovery base; 12, feeding pipe; 13, material cylinder; 14, fixed box; 15, discharging pipe; 16, filter screen; 17, through hole; 41, sliding rod; 42, threaded rod; 43, clamping rod; 44, sleeve; 45, caliper rod; 46, spring block; 47, round rod; 48, blocking rod; 51, spline rod; 52, collar; 53, large gear; 54, spring block; 55, extrusion rod; 56, small gear; 57, conical block; 58, pressing plate; 61, spring groove; 62, crushing knife; 63, telescopic rod; 64, L-shaped chute; 65, T-shaped slider; 66, connecting rod; 67, pressing block; 71, gear disk; 72, semi-gear; 73, gear; 74, rotating shaft. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1 to 12, the present invention provides a technical solution: a gravity soil screening device for soil remediation, including the equipment body 1. The equipment body 1 includes a recovery base 11, the upper end of the recovery base 11 is fixedly communicated with a feeding pipe 12, the upper end of the feeding pipe 12 is fixedly communicated with a material cylinder 13, a fixed box 14 is fixedly connected to the side surface of the material cylinder 13, a discharge pipe 15 is opened at the lower end of the fixed box 14, a filter screen 16 is fixedly connected inside the material cylinder 13, a through hole 17 is opened between the material cylinder 13 and the fixed box 14, a feeding port 8 is opened on the side of the material cylinder 13, and a blower 3 is arranged inside the fixed box 14.

[0038] A driving motor 2 is fixedly connected to the upper surface of the material cylinder 13, a driving mechanism 4 is arranged at the lower end of the driving motor 2, a clutch crushing mechanism 5 is rotatably connected inside the material cylinder 13, an auxiliary mechanism 6 is arranged inside the clutch crushing mechanism 5, and a positive and negative pressure mechanism 7 rotates inside the material cylinder 13.

[0039] The driving mechanism 4 includes a slide bar 41, the slide bar 41 is fixedly connected to the surface of the material cylinder 13, the lower end of the output shaft of the driving motor 2 is fixedly connected with a threaded rod 42, a clamping rod 43 is threadedly connected to the surface of the threaded rod 42, a sleeve 44 is slidably connected to the surface of the slide bar 41, a caliper rod 45 is slidably connected inside the sleeve 44, a spring block 46 is slidably connected inside the sleeve 44, a round rod 47 is fixedly connected to the surface of the spring block 46, the spring block 46 is initially stuck on the outer surface of the clamping rod 43, and a stop rod 48 is fixedly connected to the surface of the material cylinder 13.

[0040] The clutch crushing mechanism 5 includes a spline rod 51, the spline rod 51 is fixedly connected to the lower end of the clamping rod 43, a collar 52 is spline-connected to the surface of the spline rod 51, a large gear 53 is fixedly connected to the edge of the collar 52, the large gear 53 is rotatably connected to the upper end inside the material cylinder 13, the large gear 53 is rotatably connected to the upper end inside the material cylinder 13, a spring block 54 is slidably connected inside the collar 52, an extrusion rod 55 is fixedly connected to the surface of the spring block 54, a conical block 57 is fixedly connected to the lower end of the spline rod 51, a pressing plate 58 is fixedly connected to the lower end of the conical block 57, a small gear 56 is rotatably connected to the upper end inside the material cylinder 13, the large gear 53 meshes with the small gear 56, the large gear 53 and the small gear 56 form a gear set, when the large gear 53 rotates, the rotation of the small gear 56 is accelerated, the soil is crushed through the pressing plate 58, so that the initially filtered soil passes through the filter screen 16 again for further subdivision of the soil. This step can, according to specific soil remediation requirements and objectives, screen the soil more precisely according to different particle size ranges to meet the requirements of the subsequent treatment process for soil particle size. With the assistance of the crushing knife 62, the screening efficiency is accelerated and the working efficiency is improved.

[0041] The auxiliary mechanism 6 includes a spring groove 61 which is opened inside the pressing plate 58. A crushing knife 62 is slidably connected inside the spring groove 61. The other side of the spring block 54 is fixedly connected to a telescopic rod 63. The surface of the pressing plate 58 is fixedly connected to an L-shaped sliding groove 64. A T-shaped slider 65 is slidably connected inside the L-shaped sliding groove 64. Both sides of the T-shaped slider 65 are connected to a connecting rod 66. The L-shaped sliding groove 64 slidably connects a pressing block 67 inside. The side of the pressing block 67 is rotatably connected to the connecting rod 66. When the T-shaped slider 65 moves, it will drive the pressing block 67 to move through the connecting rod 66 until the pressing block 67 moves to the inner wall of the L-shaped sliding groove 64 and is squeezed by the inner wall of the L-shaped sliding groove 64. At this time, the pressing block 67 will deform through the connecting rod 66.

[0042] The positive and negative pressure mechanism 7 includes a gear disc 71 which is rotatably connected to the upper surface of the barrel 13. A semi-gear 72 is fixedly connected inside the gear disc 71. A gear 73 is rotatably connected to the upper surface of the barrel 13. A rotating shaft 74 is fixedly connected to the surface of the gear 73. The output shaft of the semi-gear 72 is fixedly connected to the output shaft of the small gear 56. The gear disc 71 is provided with a semi-group of teeth. At the same time, when the gear disc 71 rotates, it will drive the semi-gear 72 to rotate, and when rotating, it will engage with the gear 73 alternately. The rotating shaft 74 is connected to the output shaft of the fan blade of the fan 3 to drive the fan blade of the fan 3 to rotate.

[0043] By generating negative pressure with the fan 3, the negative pressure environment can, to a certain extent, reduce the resistance of the air to the soil particles, making it easier for the soil particles to fall under the action of gravity, promoting the flow of the soil particles in the device, improving the screening efficiency. At the same time, during the screening process, the negative pressure can prevent the air outside the device from carrying impurities into the device, and can also prevent the already screened impurities from returning to the screening area due to air flow disturbance, ensuring the screening effect. When generating positive pressure with the fan 3, an additional thrust is applied to the soil particles in the screening device, which helps to overcome gravity and friction, making the soil move more smoothly in the device, conveying from the feeding pipe 12 towards the discharge port, and improving the screening efficiency and continuity.

[0044] The usage method and advantages of the present invention: The usage method of the gravity-type soil screening device for soil remediation is as follows. The working process is as follows:

[0045] During use, first place the soil into the interior of the barrel 13 through the feed inlet 8, and then start the drive motor 2. The drive motor 2 drives the threaded rod 42 to rotate. When the threaded rod 42 rotates, since the clamping rod 43 is stuck by the spring catch 46 and the sleeve 44 is limited by the slide rod 41, the clamping rod 43 slides downward on the surface of the threaded rod 42, and at the same time drives the sleeve 44 to slide downward. When the sleeve 44 slides downward, it drives the caliper rod 45 to slide downward. When the caliper rod 45 slides downward, it will be blocked by the stop rod 48. The caliper rod 45 slides upward relatively inside the sleeve 44. When the caliper rod 45 slides, it drives the round rod 47 to slide through the V-shaped groove opened on itself. When the round rod 47 slides, it slides outward along the track of the V-shaped groove. When the round rod 47 slides, it drives the spring catch 46 to slide simultaneously and separates from the clamping rod 43. When the clamping rod 43 slides downward, it drives the spline rod 51 to slide downward simultaneously. When the spline rod 51 slides downward, it drives the pressing plate 58 to slide downward and preliminarily crushes the soil on the surface of the filter screen 16. When the restriction on the clamping rod 43 is released, the clutch crushing mechanism 5 restricts the rotational freedom of the clamping rod 43. When the clamping rod 43 is subjected to the acting force of the rotation of the threaded rod 42, it will perform a linear motion on the surface of the threaded rod 42 in cooperation with the slide rod 41. There is friction between the spiral mating surface of the threaded rod 42 and the clamping rod 43. When the screw rotates, the friction force will cause the clamping rod 43 to receive a tangential force, and this tangential force will drive the cylinder to rotate around its own axis;

[0046] When the spline rod 51 moves downward, it slides downward inside the collar 52 and at the same time drives the tapered block 57 to slide downward. When the tapered block 57 slides, it squeezes the extrusion rod 55 through its hypotenuse. The extrusion rod 55 will expand outward along the hypotenuse of the tapered block 57 and at the same time drive the telescopic rod 63 to move. When the telescopic rod 63 moves, it drives the T-shaped slider 65 to slide inside the L-shaped chute 64. When the T-shaped slider 65 slides, it drives the pressing block 67 to slide through the connecting rod 66 until it slides to the inner wall of the L-shaped chute 64 and is squeezed by the inner wall. The T-shaped slider 65 squeezes the extrusion block 67 through the connecting rod 66 to make it slide downward. When the pressing block 67 slides downward, it squeezes the crushing knife 62. The crushing knife 62 slides downward inside the spring groove 61. When the crushing knife 62 slides, it extends to the outside of the bottom of the pressing plate 58. At this time, the threaded rod 42 drives the clamping rod 43 to rotate, the clamping rod 43 drives the spline rod 51 to rotate, the spline rod 51 drives the pressing plate 58 to rotate, and the pressing plate 58 drives the extended crushing knife 62 to rotate for secondary crushing;

[0047] The soil is crushed through two processes: extrusion and crushing by the pressing plate 58 and crushing by the crushing knife 62, which is equivalent to crushing the soil in two different ways. The extrusion by the pressing plate 58 mainly breaks large soil particles through pressure, while the crushing knife 62 can further crush the soil by shear. The combination of the two methods can make the soil particles be crushed more fully, obtaining more uniform and finer particles, better meeting the requirements of soil detection for the particle size of samples;

[0048] When the collar 52 rotates, it drives the large gear 53 to rotate. When the large gear 53 rotates, it drives the small gear 56 to rotate. When the small gear 56 rotates, it drives the semi-gear 72 to rotate. When the semi-gear 72 rotates, it drives the gear disk 71 to rotate. The simultaneous rotation of the semi-gear 72 and the gear disk 71 causes the gears 73 to mesh alternately, and the gears 73 will reciprocate forward and backward. The rotation of the gears 73 drives the fan blades in the fan 3 to rotate forward and backward. When the machine is operating, all ports will be closed to form a closed environment. When the fan blades rotate forward and backward, positive and negative pressures will be generated. When the soil is first squeezed and then crushed, after being squeezed, the pore volume of the soil decreases, which causes the soil to become more compact. When the squeezed soil is further crushed by the crushing knife 62, air flow can be generated during the screening process through positive and negative pressures, improving the overall screening speed and enabling more soil samples to be processed per unit time;

[0049] When the fan 3 generates positive pressure, the positive pressure can make the movement of soil particles on the sieve more active, helping the particles to disperse and stratify better, reducing the agglomeration between particles and the phenomenon of clogging the sieve holes. This enables soil particles of different particle sizes to pass through the corresponding sieve holes more accurately, thereby improving the screening accuracy and effect;

[0050] When the fan 3 generates negative pressure, the negative pressure environment can, to a certain extent, reduce the resistance of air to soil particles, making the soil particles fall more easily under the action of gravity, promoting the flow of soil particles in the device, and improving the screening efficiency. At the same time, during the screening process, the negative pressure can prevent air outside the device from carrying impurities into the device, and can also prevent the screened impurities from returning to the screening area due to air flow disturbance, ensuring the screening effect. When generating positive pressure, an additional thrust is applied to the soil particles in the screening device, which helps to overcome gravity and friction, enabling the soil to move more smoothly in the device, transporting from the feed port to the discharge port direction, and improving the screening efficiency and continuity;

[0051] Finally, by controlling the reverse rotation of the threaded rod 42, the device can be reset to its initial state. When the crushing knife 62 retracts into the spring groove 61, the crushing knife 62 itself will slide in through the bottom of the pressing plate 58. When passing through the bottom of the pressing plate 58, the soil on the surface of the crushing knife 62 will be scraped off, preventing soil from remaining on the surface of the crushing knife 62 and retaining the soil to the greatest extent. The decomposed soil will enter the interior of the recovery base 11 through the filter screen 16, while the impurities are discharged through the discharge pipe 15 for separation.

[0052] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A gravity soil screening device for soil remediation, comprising an equipment body (1). The equipment body (1) includes a recovery base (11). The upper end of the recovery base (11) is fixedly communicated with a feeding pipe (12). The upper end of the feeding pipe (12) is fixedly communicated with a material cylinder (13). The side of the material cylinder (13) is fixedly connected with a fixed box (14). The lower end of the fixed box (14) is provided with a discharge pipe (15). A filter screen (16) is fixedly connected inside the material cylinder (13). A through hole (17) is provided between the material cylinder (13) and the fixed box (14). A feeding port (8) is provided on the side of the material cylinder (13). A blower (3) is arranged inside the fixed box (14). It is characterized in that: A driving motor (2) is fixedly connected to the upper surface of the material cylinder (13). A driving mechanism (4) is arranged at the lower end of the driving motor (2). A clutch crushing mechanism (5) is rotatably connected inside the material cylinder (13). An auxiliary mechanism (6) is arranged inside the clutch crushing mechanism (5). A positive and negative pressure mechanism (7) rotates inside the material cylinder (13).

2. The gravity soil screening device for soil remediation according to claim 1, wherein: The driving mechanism (4) includes a slide bar (41). The slide bar (41) is fixedly connected to the surface of the material cylinder (13). The lower end of the output shaft of the driving motor (2) is fixedly connected with a threaded rod (42). A clamping rod (43) is threadedly connected to the surface of the threaded rod (42). A sleeve (44) is slidably connected to the surface of the slide bar (41). A caliper rod (45) is slidably connected inside the sleeve (44). A spring block (46) is slidably connected inside the sleeve (44). A round rod (47) is fixedly connected to the surface of the spring block (46). The spring block (46) is initially stuck on the outer surface of the clamping rod (43). A stop rod (48) is fixedly connected to the surface of the material cylinder (13).

3. A gravity soil screening device for soil remediation according to claim 2, characterized in that: The clutch crushing mechanism (5) includes a spline rod (51). The spline rod (51) is fixedly connected to the lower end of the clamping rod (43). A collar (52) is spline-connected to the surface of the spline rod (51). The edge of the collar (52) is fixedly connected with a large gear (53). The large gear (53) is rotatably connected to the upper end inside the material cylinder (13). The large gear (53) is rotatably connected to the upper end inside the material cylinder (13). A spring block (54) is slidably connected inside the collar (52). A pressing rod (55) is fixedly connected to the surface of the spring block (54). A conical block (57) is fixedly connected to the lower end of the spline rod (51). A pressing plate (58) is fixedly connected to the lower end of the conical block (57).

4. A gravity soil screening device for soil remediation according to claim 3, characterized in that: A small gear (56) is rotatably connected to the upper end inside the material cylinder (13). The large gear (53) meshes with the small gear (56). The large gear (53) and the small gear (56) form a gear set, and when the large gear (53) rotates, it accelerates the rotation of the small gear (56).

5. The gravity soil screening device for soil remediation according to claim 4, characterized in that: The auxiliary mechanism (6) includes a spring groove (61) which is formed inside the pressing plate (58). A crushing knife (62) is slidably connected inside the spring groove (61). The other side of the spring block (54) is fixedly connected to a telescopic rod (63). The surface of the pressing plate (58) is fixedly connected to an L-shaped sliding groove (64). A T-shaped slider (65) is slidably connected inside the L-shaped sliding groove (64). Both sides of the T-shaped slider (65) are connected to a connecting rod (66). A pressing block (67) is slidably connected inside the L-shaped sliding groove (64). The side of the pressing block (67) is rotatably connected to the connecting rod (66).

6. The gravity soil screening device for soil remediation according to claim 5, characterized in that: When the T-shaped slider (65) moves, it will drive the pressing block (67) to move through the connecting rod (66) until the pressing block (67) moves to the inner wall of the L-shaped sliding groove (64) and is squeezed by the inner wall of the L-shaped sliding groove (64). At this time, the pressing block (67) will deform through the connecting rod (66).

7. A gravity soil screening device for soil remediation according to claim 6, characterized in that: The positive and negative pressure mechanism (7) includes a gear disc (71) which is rotatably connected to the upper surface of the material cylinder (13). A semi-gear (72) is fixedly connected inside the gear disc (71). A gear (73) is rotatably connected to the upper surface of the material cylinder (13). A rotating shaft (74) is fixedly connected to the surface of the gear (73).

8. A gravity soil screening device for soil remediation according to claim 7, characterized in that: The output shaft of the semi-gear (72) is fixedly connected to the output shaft of the small gear (56). Half a set of teeth are provided inside the gear disc (71). At the same time, when the gear disc (71) rotates, it will drive the semi-gear (72) to rotate. When rotating, it meshes with the gear (73) alternately. The rotating shaft (74) is connected to the output shaft of the fan blade of the fan (3) to drive the fan blade of the fan (3) to rotate.

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