A soil multi-stage screening device

Abstract

The utility model provides a kind of soil multistage screening device, it is related to soil screening field.The soil multistage screening device includes first screening device, second screening device and material guiding device, wherein, the first sieve box and the second sieve box are vertically misaligned, the first sieve box is located above the material guiding box, the second sieve box is located at the lateral side of the material guiding box;The upper end of the material guiding plate is used to support the soil after the first sieve box screening, and the lower end extends to the feed inlet of the second sieve box.The utility model vertically misaligns the first sieve box and the second sieve box, and realizes the soil conveying between the two by the material guiding device, effectively solves the problem of inconvenient screen replacement caused by the upper and lower stacking of the upper and lower screening devices in the traditional multistage screening device.This structure design makes it unnecessary to move or disassemble the first screening device when replacing the second screen, simplifying the replacement process.

Description

Technical Field

[0001] This utility model belongs to the field of soil screening technology, and in particular relates to a multi-stage soil screening device. Background Technology

[0002] Currently, my country has a large amount of land awaiting development, much of which is polluted to some extent and requires remediation. Ex-situ soil remediation, with its rapid remediation characteristics, is one of the most commonly used methods among various remediation approaches.

[0003] In existing multi-stage soil screening devices, the previous stage screening device is usually placed above the next stage screening device to perform multi-stage screening. Although this design can provide some convenience for soil input and output, in actual screening, if it is necessary to replace the next stage screen, the entire previous stage screening device must be moved or disassembled. The operation process is complicated and time-consuming, which seriously affects the continuity and efficiency of screening operations. Utility Model Content In view of this, the present invention provides a multi-stage soil screening device, which aims to improve the convenience of screen replacement.

[0004] The technical solution of this utility model is implemented as follows: This utility model provides a multi-stage soil screening device, comprising: a first screening device, including a first screen box and a first vibration mechanism for vibrating the first screen box; the first screen box is provided with a first screen for primary screening of soil; a second screening device, including a second screen box and a second vibration mechanism for vibrating the second screen box; the second screen box is provided with a second screen for secondary screening of soil; a material guiding device connected between the first screen box and the second screen box; the material guiding device includes a material guiding box and a material guiding plate inclinedly disposed within the material guiding box; wherein the first screen box and the second screen box are vertically offset, the first screen box is disposed above the material guiding box, and the second screen box is disposed on one side of the material guiding box laterally; the upper end of the material guiding plate is used to receive the soil screened by the first screen box, and the lower end extends to the inlet of the second screen box.

[0005] In one embodiment, the first screening device further includes: a fan for blowing air into the first screening box; and a hook disposed on the inner side wall of the first screening box to collect soft strip-shaped materials inside the first screening box.

[0006] In one embodiment, the hook extends laterally; and / or, a plurality of hooks are provided, the plurality of hooks being spaced apart vertically.

[0007] In one embodiment, the second screening device further includes a magnetic attraction component, which includes an electromagnet disposed inside the second screening box to attract metals in the soil of the second screening box.

[0008] In one embodiment, the magnetic attraction assembly further includes a suspension member, the upper end of which is connected to the top wall of the second sieve box, and the lower end of which is connected to the electromagnet.

[0009] In one embodiment, the first vibration mechanism includes a first motor base, a first motor, and a first eccentric wheel. The first motor base is fixed to the outer side wall of the first screen box 11, the housing of the first motor is fixed to the motor base, and the eccentric wheel is fixedly connected to the output shaft of the first motor. And / or, the second vibration mechanism includes a second motor base, a second motor, and a second eccentric wheel. The second motor base is fixed to the outer side wall of the second screen box, the housing of the second motor is fixed to the motor base, and the eccentric wheel is fixedly connected to the output shaft of the second motor.

[0010] In one embodiment, it further includes: a horizontal conveying device, comprising a first annular belt extending horizontally and a first driving mechanism for driving the belt to rotate, one end of the first annular belt being located below the discharge port of the second screen box; and a pesticide addition device having a pesticide outlet located above the first annular belt for adding pesticide to the soil on the belt.

[0011] In one embodiment, a plurality of drug dispensing devices are provided, and the plurality of drug dispensing devices are spaced apart along the extension direction of the first annular belt. In one embodiment, the device further includes an upward conveying device, comprising a second annular belt extending at an angle, and a second drive mechanism for driving the second annular belt to rotate; the lower end of the second annular belt is disposed below the end of the first annular belt away from the second screen box, and the upper end of the second annular belt extends obliquely upward.

[0012] In one embodiment, a water spraying device is also included, which includes a spray pipe and a water pump for driving water in the spray pipe to flow upward. The spray nozzle of the spray pipe is located above the second annular belt to spray water onto the soil on the second annular belt.

[0013] The multi-stage soil screening device provided by this utility model effectively solves the problem of inconvenient screen replacement caused by the stacking of upper and lower screening devices in traditional multi-stage screening devices by vertically offsetting the first and second screen boxes and using a material guiding device to realize soil transportation between them. This structural design allows for the replacement of the second screen without any movement or disassembly of the first screening device, greatly simplifying the replacement process, significantly shortening the replacement time, thus facilitating the continuity of screening operations and improving overall screening efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the overall soil multi-stage screening device provided by this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. First screening device; 11. First screen box; 12. First vibration mechanism; 121. First motor base; 122. First motor; 123. First eccentric wheel; 13. First screen; 14. Fan; 15. Hook; 2. Second screening device; 21. Second screen box; 22. Second vibration mechanism; 221. Second motor base; 222. Second motor; 223. Second eccentric wheel; 23. Second drying net; 24. Magnetic suction assembly; 241. Electromagnet; 242. Suspension component; 3. Material guiding device; 31. Material guiding box; 32. Material guiding plate; 4. Horizontal conveying device; 41. First annular belt; 5. Reagent adding device; 6. Upward conveying device; 61. Second annular belt; 7. Water spraying device; 71. Spray pipe; 42. Water pump. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0018] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0019] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. "Multiple" refers to two or more. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] Currently, my country has a large amount of land awaiting development, much of which is polluted to some extent and requires remediation. Ex-situ soil remediation, with its rapid remediation characteristics, is one of the most commonly used methods among various remediation approaches.

[0021] In existing multi-stage soil screening devices, the previous stage screening device is usually placed above the next stage screening device to perform multi-stage screening. Although this design can provide some convenience for soil input and output, in actual screening, if it is necessary to replace the next stage screen, the entire previous stage screening device must be moved or disassembled. The operation process is complicated and time-consuming, which seriously affects the continuity and efficiency of screening operations. In view of this, the present invention provides a multi-stage soil screening device, which aims to improve the convenience of screen replacement.

[0022] This multi-stage soil screening device can be used to screen soil particles of different sizes to meet the precise particle size distribution requirements in soil remediation, agricultural planting, and engineering construction. In soil remediation, screening separates large impurities from soil particles of different sizes, facilitating targeted remediation processes for each particle size. In agriculture, the screened soil can have its particle size distribution adjusted according to crop growth needs, optimizing soil structure and improving water and fertilizer retention. Furthermore, screening foundation soil before construction ensures uniform soil particle size, guaranteeing the stability of the foundation.

[0023] Please see Figure 1 The soil multi-stage screening device includes a first screening device 1, a second screening device 2, and a material guiding device 3, with the material guiding device 3 connected between the first screening device 1 and the second screening device 2.

[0024] The first screening device 1 includes a first screen box 11 and a first vibration mechanism 12. The first vibration mechanism 12 drives the first screen box 11 to vibrate. The first screen 13 installed inside the first screen box 11 initially separates the soil into large-diameter impurities and pre-screened soil. The large-diameter impurities remain above the first screen 13, while the pre-screened soil falls through the mesh of the first screen 13 into the bottom of the first screen box 11 and moves towards the guide device 3 under the action of the first vibration mechanism 12. To facilitate the discharge of large-diameter impurities, a large-diameter discharge port can be provided at the end of the first screen box 11 away from the guide device 3, and a collection container can be placed below the discharge port.

[0025] The second screening device 2 includes a second screen box 21 and a second vibration mechanism 22. The second vibration mechanism 22 provides vibration power to the second screen box 21. The second screen mesh in the second screen box 21 has a smaller aperture than the first screen mesh 13. It is used to perform a finer secondary screening of the initially screened soil conveyed by the material guiding device 3, further separating medium-sized soil particles and small-sized soil particles. Soil particles of different sizes are discharged from the corresponding outlets of the second screen box 21. Specifically, medium-sized soil particles remain above the second screen mesh and are discharged from the medium-sized outlet of the second screen box 21 under the action of the second vibration mechanism 22, flowing to the collection box below. Small-sized soil particles flow to the collection box below the small-sized soil outlet of the second screen box 21, or flow to the horizontal conveying device 4 mentioned in the following embodiments for subsequent processing such as adding reagents.

[0026] The material guiding device 3 includes a material guiding box 31 and a material guiding plate 32. A portion of the material guiding plate 32 is inclined inside the material guiding box 31, and the other portion extends outside the material guiding box 31. The top of the material guiding box 31 has an inlet communicating with the bottom of the first screen box 11. The upper end of the material guiding plate 32 receives the pre-screened soil discharged from the first screen box 11, and the lower end extends to the inlet of the second screen box 21. The inclination angle of the material guiding plate 32 can be designed to be 30° to 45°. Due to the inclined setting of the material guiding plate 32, the soil can be smoothly conveyed from the first screen box 11 to the second screen box 21 under its own weight and the guiding action of the material guiding plate 32, avoiding soil accumulation and blockage during the conveying process.

[0027] Springs are installed between the first screen box 11 and the guide box 31, and between the second screen box 21 and the ground, to facilitate the shaking of the first screen box 11 and the second screen box 21.

[0028] The multi-stage screening process is as follows: The soil to be screened is fed into the inlet of the first screen box 11. The first vibration mechanism 12 is activated and drives the first screen box 11 to vibrate. The soil tumbles continuously within the first screen box 11 as the box vibrates. Large-diameter impurities are trapped by the first screen 13. The pre-screened soil falls onto the guide plate 32 of the guiding device 3 through the first screen 13. Under the inclined guiding action of the guide plate 32, the pre-screened soil slides along the guide plate 32 to the inlet of the second screen box 21 and enters the second screen box 21. The second vibration mechanism 22 drives the second screen box 21 to vibrate. The soil entering the second screen box 21 is further screened on the second screen. Medium-diameter soil particles remain on the second screen, while small-diameter soil particles pass through the second screen, completing the secondary screening operation.

[0029] When the second screen needs to be replaced, the first screen box 11 and the second screen box 21 are vertically offset, which facilitates disassembly. Specifically, during disassembly, there is no need to move or disassemble the first screen box 11; the second screen inside the second screen box 21 can be replaced directly. The operator only needs to open the access door of the second screen box 21, loosen the screen fixing components, and then remove the old screen and install the new one.

[0030] The multi-stage soil screening device provided by this utility model effectively solves the problem of inconvenient screen replacement caused by the stacking of upper and lower screening devices in traditional multi-stage screening devices by vertically offsetting the first screen box 11 and the second screen box 21 and using the material guiding device 3 to realize soil transportation between the two. This structural design allows the replacement of the second screen without any moving or disassembling of the first screening device 1, greatly simplifying the replacement process, significantly shortening the replacement time, thus facilitating the continuity of screening operations and improving the overall screening efficiency.

[0031] In some embodiments, please refer to Figure 1 To separate the soft strip-shaped materials, a hook 15 is provided inside the first sieve box 11. Specifically, the hook 15 is provided on the inner side wall of the first sieve box 11 to collect the soft strip-shaped materials inside the first sieve box 11. In addition, a fan 14 is provided outside the first sieve box 11 to blow air into the first sieve box 11.

[0032] Soft, stringy materials can include plant roots, plastic film fragments, fiber rope ends, and strips of cloth in the soil. If these materials are not removed from the soil in time, they will not only become entangled on the screen, affecting screening efficiency, but may also damage equipment components or affect soil remediation during subsequent processing. When the first screen box 11 vibrates under the drive of the first vibration mechanism 12, the soft, stringy materials in the soil will separate from the soil particles under the vibration. Some of the soft, stringy materials will remain suspended or move due to their shape or weak adhesion to the soil particles. At this time, the hook 15 can hook and collect them. At the same time, the blower 14 blows air into the first screen box 11. The airflow can blow lighter soft, stringy materials toward the hook 15, improving the capture rate of the soft, stringy materials by the hook 15. The hook 15 can be designed as a detachable structure. After a certain amount of soft, stringy materials have been collected, the operator can open the inspection cover of the first screen box 11, remove the hook 15 for cleaning, and then reinstall it for continued use. The air inlet of the blower 14 can be equipped with a filter to prevent external dust and debris from entering the first sieve box 11 and contaminating the soil; the air outlet can be equipped with a guide plate to ensure that the blown airflow is evenly distributed within the first sieve box 11, improving the blowing effect on soft strips. By setting up the hook 15 and the blower 14, soft strips in the soil can be effectively removed, further improving the purity of the soil after screening and reducing interference from subsequent processing steps.

[0033] In some embodiments, please refer to Figure 1 To better separate soft strips, the hook 15 has been optimized. The hook 15 extends laterally; and / or, multiple hooks 15 are provided, with the multiple hooks 15 spaced apart vertically.

[0034] The horizontally extending hooks 15 form a transverse interception line within the first sieve box 11, increasing the probability of contact with soft strips. When the soil vibrates and flows within the first sieve box 11, the soft strips are more likely to contact and be hooked by the horizontally arranged hooks 15. Multiple vertically spaced hooks 15 can intercept soft strips in the soil at different heights, preventing them from being uncollected due to their location in different soil layers, further improving the separation effect. Furthermore, the hooks 15 can be made of high-strength stainless steel to ensure they are not easily deformed or broken under long-term vibration. The ends of the hooks 15 can be designed with a rounded structure to prevent excessive cutting when hooking soft strips, facilitating subsequent centralized cleaning.

[0035] In some embodiments, please refer to Figure 1 To separate metal objects, a magnetic attraction component 24 was added. Specifically, the magnetic attraction component 24 includes an electromagnet 241, which is located inside the second sieve box 21 to attract metals in the soil of the second sieve box 21.

[0036] Electromagnet 241 can be fixed to the inner wall or top of the second screen box 21 by a bracket. Its position can be adjusted according to the installation height of the second screen and the soil flow path to ensure that the soil can fully pass through the magnetic attraction area of ​​electromagnet 241 during the vibration flow in the second screen box 21. For example, electromagnet 241 can be placed above the second screen and close to the soil inlet. When the pre-screened soil enters the second screen box 21 and falls on the second screen, the metal impurities in the soil (such as iron nails, iron pieces, metal fragments, etc.) will be turned upwards or moved with the soil under the action of vibration. At this time, the magnetic field generated by electromagnet 241 can generate an attraction force on these metal impurities, separating them from the soil and adsorbing them on the surface of electromagnet 241.

[0037] When using electromagnet 241, energize it. To clean metal impurities, put a plastic bag over electromagnet 241 and then turn off the power. The metal impurities on electromagnet 241 will fall into the plastic bag.

[0038] Furthermore, the electromagnet 241 is located in the second sieve box 21, while the hook 15 is located in the first sieve box 11. That is, the electromagnet 241 and the hook 15 are not located in the same sieve box, which has the following beneficial effects: The first sieve box 11 is mainly used to separate large-diameter impurities and perform preliminary sieving of soil. Soft strips mixed in the soil are easily hooked by the hook 15 during vibration. If the electromagnet 241 is set at the same time, the soft strips may become entangled on the electromagnet 241, affecting the adsorption effect of the electromagnet 241 on metal impurities. Moreover, the soft strips and metal impurities need to be treated at the same time during cleaning, increasing the complexity of operation. When the second sieve box 21 performs secondary sieving, the soil particles are finer, and metal impurities are more easily exposed. At this time, setting the electromagnet 241 can more accurately adsorb metal impurities and avoid mutual interference with soft strips, making the separation process of the two impurities more efficient and the cleaning more convenient.

[0039] In some embodiments, please refer to Figure 1 To enable the electromagnet 241 to better attract metals from the soil, a suspension component 242 is added to the magnetic attraction assembly 24. Specifically, the upper end of the suspension component 242 is connected to the top wall of the second sieve box 21, and the lower end is connected to the electromagnet 241.

[0040] The suspension component 242 can be made of flexible materials, such as springs or elastic ropes. When the second screen box 21 vibrates under the drive of the second vibration mechanism 22, the suspension component 242 can drive the electromagnet 241 to vibrate together with the screen box. Under its own weight and the elasticity of the suspension component 242, the electromagnet 241 will produce a small sway relative to the screen box. This dynamic magnetic attraction method can increase the contact opportunity between the electromagnet 241 and metal impurities in the soil, and prevent metal impurities from not being attracted due to soil particles or dead corners of local vibration of the screen box. At the same time, the length of the suspension component 242 can be adjusted according to actual needs to change the height position of the electromagnet 241 in the second screen box 21, ensuring that the electromagnet 241 is in the active area of ​​soil vibration and flow, further improving the metal adsorption effect. For example, when the soil layer inside the second sieve box 21 is thick, the length of the suspension part 242 can be appropriately shortened so that the electromagnet 241 is closer to the soil surface; if the soil layer is thin, the suspension part 242 can be extended so that the electromagnet 241 penetrates into the soil layer, thereby improving the metal separation efficiency under different working conditions.

[0041] In some embodiments, please refer to Figure 1 To achieve vibration of the first screen box 11 and the second screen box 21, the first vibration mechanism 12 and the second vibration structure adopt the following specific structures: The first vibration mechanism 12 includes a first motor base 121, a first motor 122, and a first eccentric wheel 123. The first motor base 121 is fixed to the outer wall of the first screen box 11, the outer casing of the first motor 122 is fixed to the motor base, and the eccentric wheel is fixedly connected to the output shaft of the first motor 122. The second vibration mechanism 22 includes a second motor base 221, a second motor 222, and a second eccentric wheel 223. The second motor base 221 is fixed to the outer wall of the second screen box 21, the outer casing of the second motor 222 is fixed to the motor base, and the eccentric wheel is fixedly connected to the output shaft of the second motor 222.

[0042] The vibration principles of the first vibration mechanism 12 and the second vibration mechanism 22 are as follows: When the first motor 122 starts, its output shaft drives the first eccentric wheel 123 to rotate at high speed. Because the center of mass of the eccentric wheel is off-center from the rotation center, periodic centrifugal force is generated during rotation. This centrifugal force is transmitted to the first screen box 11 through the first motor base 121, causing the first screen box 11 to vibrate continuously. By adjusting the speed of the first motor 122 or replacing the first eccentric wheel 123 with different eccentricities, the vibration frequency and amplitude of the first screen box 11 can be changed to adapt to the screening requirements of different soils. Similarly, the second motor 222 drives the second eccentric wheel 223 to rotate, generating centrifugal force, which in turn drives the second screen box 21 to vibrate. The vibration parameters of the second vibration mechanism 22 can also be adjusted independently, thereby realizing differentiated control of the vibration state of the first screen box 11 and the second screen box 21, so that the two-stage screening process can be flexibly adapted according to the soil particle characteristics and screening accuracy requirements. For example, for original soil containing a lot of large impurities, the vibration frequency of the first screen box 11 can be adjusted to a higher level to quickly separate large-diameter impurities; while the second screen box 21 can use a lower frequency and larger amplitude vibration mode to promote the full stratification and screening of medium and small-diameter soil particles on the second screen.

[0043] In some embodiments, please refer to Figure 1 To achieve continuous operation of soil screening and remediation agent addition, a horizontal conveying device 4 and an agent addition device 5 are added to the multi-stage soil screening device. Specifically, the horizontal conveying device 4 includes a first annular belt 41 extending horizontally and a first drive mechanism for driving the belt to rotate. One end of the first annular belt 41 is located below the discharge port of the second screen box 21. The agent addition device 5 has an agent outlet located above the first annular belt 41 to add agents to the soil on the belt.

[0044] The first annular belt 41 of the horizontal conveyor 4 is made of wear-resistant rubber, and its surface can be provided with anti-slip texture to prevent soil from slipping due to vibration or tilting during the conveying process. The first drive mechanism includes a drive motor and a transmission roller. The drive motor drives the transmission roller to rotate via a chain or belt, thereby driving the first annular belt 41 to run smoothly at a set speed. To ensure the stability of the conveying process, multiple sets of idlers can be installed below the first annular belt 41. The idlers are evenly distributed along the length of the belt to support the belt and the soil on it, preventing the belt from sagging due to excessive load.

[0045] The agent addition device 5 includes an agent storage tank for storing liquid or solid powdered agents required for soil remediation. The storage tank is mounted above the first annular belt 41, and its bottom has multiple evenly distributed agent outlets, i.e., agent holes. The diameter and spacing of the agent holes can be designed according to the agent addition amount and soil uniformity requirements. When small-diameter soil particles, after being screened by the second screening device 2, fall from the small-diameter outlet of the second screening box 21 into the first annular belt 41, the first drive mechanism drives the belt forward to transport the soil. Simultaneously, the agent in the storage tank is evenly sprayed onto the soil surface from the agent outlets under gravity or through a metering pump. To ensure thorough mixing of the agent and soil, a stirring assembly can be installed above the first annular belt 41 after the agent outlets. The stirring assembly includes multiple sets of horizontally arranged stirring rods. Driven by the drive device, the stirring rods rotate, agitating the soil and agent on the belt to ensure that the agent can penetrate into the gaps between soil particles, achieving uniform mixing. The mixed soil is conveyed to the end via a conveyor belt and falls into subsequent treatment equipment or collection containers, thus completing an integrated operation process from soil screening and impurity removal to reagent addition. This effectively reduces intermediate transfer links and further improves the continuity and automation level of soil remediation treatment.

[0046] In some embodiments, please refer to Figure 1 In order to add multiple different drugs, multiple drug adding devices 5 are provided. Specifically, multiple drug adding devices 5 are arranged at intervals along the extension direction of the first annular belt 41. Each agent dispensing device 5 corresponds to a specific agent. For example, the first agent dispensing device 5 can add an amendment for neutralizing soil pH, the second can add a chelating agent for removing heavy metals, and the third can add a bio-initiator to promote microbial activity. Multiple agent dispensing devices 5 are arranged sequentially along the first annular belt 41, allowing the soil to come into contact with different agents in a preset order during transport, avoiding potential chemical reaction conflicts or uneven mixing problems that might occur when multiple agents are added simultaneously at the same location.

[0047] In some embodiments, please refer to Figure 1 To prevent the soil after final screening from clogging at the soil collection end of the first annular belt 41 and to prevent the first annular belt 41 from overloading and stopping due to excessive soil accumulation, an upward conveying device 6 is added. The upward conveying device 6 includes a second annular belt 61 that extends at an angle and a second drive mechanism for driving the second annular belt 61 to rotate; the lower end of the second annular belt 61 is located below the end of the first annular belt 41 away from the second screen box 21, and the upper end of the second annular belt 61 extends obliquely upward.

[0048] The second drive mechanism is similar in structure to the first drive mechanism, also including a drive motor and a transmission roller. The drive motor drives the transmission roller to rotate, which in turn drives the second annular belt 61. The inclination angle of the second annular belt 61 can be designed to be 45 to 60° according to the actual installation space and conveying height requirements. Its surface can also be provided with anti-slip ridges to enhance the friction between the soil and the belt, ensuring that the soil can be stably conveyed upward without slipping. Baffles can also be installed on both sides of the second annular belt 61 to prevent soil from scattering from the belt edges during conveying. When the soil on the first annular belt 41 is conveyed to the end, it will naturally fall into the lower end of the second annular belt 61, and then be conveyed upward to the set height by the second annular belt 61, finally falling into the collection bin or subsequent processing equipment located below the upper end of the second annular belt 61, thus realizing continuous soil transfer.

[0049] In some embodiments, please refer to Figure 1 Considering the excessive dryness of the soil, water replenishment is necessary, so a water spraying device 7 is added. Specifically, the water spraying device 7 includes a spray pipe 71 and a water pump 72 for driving the water in the spray pipe 71 to flow upward. The spray nozzle of the spray pipe 71 is located above the second annular belt 61 to spray water onto the soil on the second annular belt 61. The spray pipe 71 extends along the width of the second annular belt 61, and has multiple spray holes at its bottom. The diameter and density of the spray holes can be adjusted according to the water replenishment needs to ensure that water is sprayed evenly on the soil surface. The water pump 72 is connected to an external water source, and the flow rate of the spray water is controlled by adjusting the power of the water pump 72 to regulate the soil moisture.

[0050] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A multi-stage soil screening device for screening soil, characterized in that, include: The first screening device includes a first screen box and a first vibration mechanism for vibrating the first screen box; The first sieve box is equipped with a first sieve screen for primary sieving of the soil; The second screening device includes a second screen box and a second vibration mechanism for vibrating the second screen box; the second screen box is equipped with a second screen for secondary screening of the soil. A material guiding device is connected between the first screen box and the second screen box; the material guiding device includes a material guiding box and a material guiding plate inclinedly disposed within the material guiding box; The first screen box and the second screen box are vertically staggered, with the first screen box located above the guide box and the second screen box located on one side of the guide box in the horizontal direction; the upper end of the guide plate is used to receive the soil after screening by the first screen box, and the lower end extends to the feed inlet of the second screen box.

2. The soil multi-stage screening device according to claim 1, characterized in that, The first screening device further includes: A blower is used to blow air into the first screen box; A hook is provided on the inner side wall of the first sieve box to collect soft strip-shaped objects inside the first sieve box.

3. The soil multi-stage screening device according to claim 2, characterized in that, The hook is configured to extend laterally; and / or, The hooks are provided in multiple ways, and the multiple hooks are arranged at intervals in the vertical direction.

4. The soil multi-stage screening device according to claim 1, characterized in that, The second screening device further includes a magnetic attraction component, which includes an electromagnet disposed inside the second screening box to attract metals in the soil of the second screening box.

5. The soil multi-stage screening device according to claim 4, characterized in that, The magnetic attraction assembly also includes a suspension component, the upper end of which is connected to the top wall of the second sieve box, and the lower end of which is connected to the electromagnet.

6. The soil multi-stage screening apparatus of claim 1, wherein, The first vibration mechanism includes a first motor base, a first motor and a first eccentric wheel. The first motor base is fixed to the outer side wall of the first screen box (11), the outer shell of the first motor is fixed to the motor base, and the eccentric wheel is fixedly connected to the output shaft of the first motor. And / or, The second vibration mechanism includes a second motor base, a second motor, and a second eccentric wheel. The second motor base is fixed to the outer wall of the second screen box, the housing of the second motor is fixed to the motor base, and the eccentric wheel is fixedly connected to the output shaft of the second motor.

7. The multi-stage soil screening device according to claim 1, characterized in that, Also includes: A horizontal conveying device includes a first annular belt extending horizontally and a first drive mechanism for driving the belt to rotate, wherein one end of the first annular belt is located below the discharge port of the second screen box. A pesticide addition device has a pesticide outlet located above the first annular belt for adding pesticide to the soil on the belt.

8. The multi-stage soil screening device according to claim 7, characterized in that, Multiple drug dispensing devices are provided, and the multiple drug dispensing devices are spaced apart along the extension direction of the first annular belt.

9. The soil multi-stage screening apparatus of claim 7, wherein, It also includes an upward conveying device, comprising a second annular belt extending at an incline, and a second drive mechanism for driving the second annular belt to rotate; the lower end of the second annular belt is located below the end of the first annular belt away from the second screen box, and the upper end of the second annular belt extends obliquely upward.

10. The soil multi-stage screening apparatus of claim 9, wherein, It also includes a water spraying device, which includes a spray pipe and a water pump for driving the water in the spray pipe to flow upward. The spray nozzle of the spray pipe is located above the second annular belt to spray water onto the soil on the second annular belt.

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