A soil and stone separation method and system based on coupling vibration adjustment of water content and particle size

Abstract

The application relates to the technical field of agricultural soil treatment, in particular to a soil and stone separation method and system based on moisture content and particle size coupling vibration adjustment. The method comprises the following steps: conveying a soil and stone mixture to a vibrating screen separation device with first, second and third screen sections, acquiring moisture content and particle size distribution information before entering to determine the vibration parameters of the screen sections; controlling the first screen section to vibrate and loosen to break up soil clumps, controlling the second screen section to screen to make fine soil fall, and controlling the third screen section to vibrate and detach to remove residual soil on the surface of stone blocks; acquiring discharge detection information to identify soil and stone block and soil clump materials, when the proportion of soil and stone blocks exceeds the limit, the vibration of the third screen section is enhanced and the speed is reduced, when the proportion of soil clump materials exceeds the limit, the soil clump materials are returned to the first screen section and the vibration intensity is increased; and finally, the vibration parameters of the screen sections are updated according to the feedback data. The application can effectively solve the problems of incomplete soil and stone separation, high soil rate of stone blocks and loss of tillage soil caused by large soil clumps under wet and sticky soil conditions.

Description

Technical Field

[0001] This application relates to the field of agricultural soil treatment technology, and in particular to a soil-rock separation method and system based on vibration modulation of moisture content and particle size. Background Technology

[0002] In agricultural production activities such as farmland improvement, sandy soil remediation, and reclamation of stony farmland, the topsoil often contains stones, gravel, and large soil clumps. Effective soil-stone separation is crucial for ensuring the smooth progress of subsequent sowing, fertilization, and harvesting operations. Existing soil-stone separation equipment mainly adopts a structure of shoveling, conveying, and using drum screens or vibrating screens. The working process typically involves conveying the excavated soil-stone mixture to the screening device. Utilizing the limited aperture of the screen and the vibration of the screen body, fine soil passes through the screen holes, while stones and large particles are conveyed along the screen surface to the discharge end. Some existing technologies collect material samples to detect particle size distribution and then adjust the screening speed to optimize processing efficiency; other technologies use heating mechanisms to reduce soil moisture content to reduce adhesion, or utilize a single vibration frequency for overall screening of the mixture.

[0003] However, in existing technologies, when faced with complex farmland scenarios involving significant variations in moisture content and a large amount of wet clay, it is often difficult to simultaneously address the multiple needs of soil clump breaking, fine soil sieving, and stone removal. Due to the lack of a zoned differentiated treatment mechanism targeting the adhesion characteristics of materials, wet clay clumps are easily misinterpreted as stones and discharged, leading to soil erosion. Alternatively, the soil covering the stones may not be completely removed, resulting in excessively high soil content in the discharged stones, thus affecting the purity of soil-stone separation and the protection of arable soil. Summary of the Invention

[0004] This application provides a soil-rock separation method and system based on vibration regulation coupled with moisture content and particle size to solve the above-mentioned problems.

[0005] In a first aspect, this application provides a soil-rock separation method based on vibration modulation coupled with moisture content and particle size, the method comprising: S1. The soil-rock mixture is conveyed to a vibrating screening device, wherein the vibrating screening device is provided with a first screen section, a second screen section and a third screen section in sequence along the material movement direction; S2. Before the soil-rock mixture enters the vibrating screening device, the moisture content and particle size distribution information of the soil-rock mixture are obtained, and the vibration parameters corresponding to the first screen section, the second screen section and the third screen section are determined according to the moisture content and particle size distribution information. S3. Control the first screen section to vibrate and loosen the soil-rock mixture according to the corresponding vibration parameters, so that the soil clumps are broken and the soil attached to the surface of the stones is loosened; control the second screen section to screen according to the corresponding vibration parameters, so that the fine soil falls through the screen holes and the stones continue to move to the third screen section; control the third screen section to vibrate and desorb according to the corresponding vibration parameters, so that the residual soil on the surface of the stones falls off. S4. Obtain the detection information of the discharge from the third screening section, and identify the soil-bearing stones and soil clumps in the discharge based on the detection information; S5. When the proportion of soil-bearing stones exceeds the preset range, increase the vibration intensity of the third screen section and reduce the discharge speed to prolong the soil-bearing stones' desoiling time in the third screen section. S6. When the proportion of soil material exceeds the preset range, the soil material is returned to the first screen section, and the vibration intensity of the first screen section relative to the second screen section is increased simultaneously to increase the degree of crushing of the returned soil material in the first screen section. S7. Based on the proportion of soil and stones, the proportion of soil clumps, and the residual stones in the screened soil, update the vibration parameters of the first, second, and third screen sections, and use them for subsequent screening of soil and stone mixtures entering the vibrating screening device.

[0006] Beneficial effects: Using the above scheme, vibration parameters for the three screening sections are set according to moisture content and particle size distribution before feeding. The first screening section is used for loose soil clumps, the second for sieving fine soil, and the third for removing soil adhering to stones. After identifying soil clumps with soil and stones and soil clumps without stones at the discharge end, the vibration frequency and discharge speed of the third screening section are adjusted, or the non-stone soil clumps are returned to the first screening section. Simultaneously, the parameters of the second screening section are adjusted based on the residual stones in the undersize soil. This reduces the misdischarge of soil clumps and soil-carrying stones that occur under fixed vibration parameters, and improves the screening stability under different moisture contents and particle size distributions.

[0007] Optionally, in step S2, the particle size distribution information is obtained by collecting surface images or contour information of the soil-rock mixture, and the proportion of fine soil and large material is calculated according to the equivalent diameter of the material projection. Among them, the proportion of fine soil is the proportion of material areas with a projected equivalent diameter smaller than the first particle size threshold in the collection area, and the proportion of large material is the proportion of material areas with a projected equivalent diameter greater than the second particle size threshold in the collection area, wherein the second particle size threshold is greater than the first particle size threshold.

[0008] Beneficial effects: By calculating the projected equivalent diameter of the material using surface images or contour information, and separately statistically analyzing the proportions of material regions smaller than the first particle size threshold and larger than the second particle size threshold, the content of fine soil and large particles can be converted into quantitative parameters for vibration control. Retaining an intermediate particle size range between the first and second particle size thresholds reduces classification bias caused by directly dividing irregular materials and provides a basis for determining the initial vibration parameters of each screen segment.

[0009] Optionally, the moisture content, fine soil ratio, and large material ratio obtained in step S2 are compared with the corresponding thresholds and used to generate the initial vibration parameters of the first, second, and third screen sections. Among them, when the moisture content is not lower than the first moisture content threshold and the proportion of large pieces of material is not lower than the first large piece proportion threshold, the amplitude of the first screen section is made greater than the amplitude of the second screen section. When the proportion of fine soil is not lower than the first fine soil proportion threshold, the vibration displacement component of the second screen section along the screen surface direction is greater than the vibration displacement component of the first screen section along the screen surface direction.

[0010] Beneficial effects: By comparing the moisture content, fine soil percentage, and large material percentage with corresponding thresholds, the amplitude relationship and displacement component relationship along the screen surface of the first and second screening sections are determined respectively. When the moisture content and large material percentage are high, a larger amplitude is used in the first screening section to increase the loosening effect on soil clumps; when the fine soil percentage is high, a larger displacement component along the screen surface is used in the second screening section to promote material spreading and fine soil penetration. This parameter setting allows clump breaking and penetration to occur in the corresponding screening sections, reducing the mutual influence between the two operational requirements.

[0011] Optionally, during screening in the first screening section, the first screening section is controlled to form a vibration process that includes a vertical vibration stage and an intermittent impact stage, so that the soil clumps entering the first screening section are thrown up, fall back and crack. When the moisture content is not lower than the first moisture content threshold, the vertical amplitude of the first sieve segment after adjustment is greater than the vertical amplitude before adjustment.

[0012] Beneficial effects: The first screening section generates a vibration process combining vertical vibration and intermittent impact, causing the soil clumps to experience being thrown up, falling back, and colliding. When the moisture content reaches the first moisture content threshold, the vertical amplitude of the first screening section is further increased to enhance the loosening effect on the wet clay clumps. Because the increased vibration intensity is concentrated in the first screening section, the possibility of large soil clumps entering subsequent screening sections or clogging the screen openings can be reduced without simultaneously increasing the vibration intensity of each screening section.

[0013] Optionally, during screening in the second and third screening sections, the displacement component along the screen surface in the vibration trajectory of the second screening section is made greater than the displacement component along the screen surface in the third screening section, and the acceleration component perpendicular to the screen surface in the vibration trajectory of the third screening section is made greater than the acceleration component perpendicular to the screen surface in the second screening section. This results in fine soil mainly falling through the screen holes in the second screening section and stones mainly turning over and being de-soiled in the third screening section.

[0014] Beneficial effects: The second screening section has a larger displacement component along the screen surface, which is beneficial for the spread of loosened material along the screen surface and for bringing fine soil closer to the screen holes; the third screening section has a larger acceleration component perpendicular to the screen surface, which is beneficial for the overturning of stones and the removal of surface soil. By setting the vibration trajectories of the second and third screening sections separately, fine soil can pass through the screen and stones can be removed in different sections, reducing the mutual constraints of a single vibration trajectory on the two operational objectives.

[0015] Optionally, in step S4, the image information of the discharge is used to obtain the soil coverage area ratio, and the impact sound information of the discharge is used to obtain the main frequency of the impact sound. When the soil coverage area is less than the first coverage threshold and the main frequency of the impact sound is not lower than the first sound threshold, the discharge is identified as stones. When the soil coverage area is not less than the first coverage threshold and the main frequency of the impact sound is not lower than the first sound threshold, the discharge is identified as soil-bearing rocks. When the soil coverage area is not less than the second coverage threshold and the dominant frequency of the impact sound is lower than the first sound threshold, the discharge is identified as a non-rock clump. The second coverage threshold is greater than the first coverage threshold.

[0016] Beneficial effects: The soil cover area ratio reflects the amount of soil adhering to the surface of the discharge, while the dominant frequency of the impact sound reflects whether the discharge has a hard core. Using both test results together allows for the differentiation between stones with less surface soil, stones with soil, and non-stone clumps, and provides clear triggering conditions for subsequent adjustments to the third sieve parameters or the return of clumps. Compared to judging solely based on appearance or impact sound, this reduces confusion between stones with soil and wet clay clumps.

[0017] Optionally, within a sampling period, when the ratio of the number of soil-bearing stones to the total number of discharged materials is not lower than the first discharge ratio threshold, the vibration frequency of the third screen section after adjustment is set to be greater than the vibration frequency before adjustment, and the discharge speed of the third screen section after adjustment is set to be less than the discharge speed before adjustment, so as to increase the residence time of soil-bearing stones in the third screen section.

[0018] Beneficial effects: When the proportion of soil-bearing stones reaches the threshold of the first discharge ratio, increasing the vibration frequency of the third screen section and reducing the discharge speed can increase the number of vibrations per unit residence time and extend the processing time of the material in the third screen section. This adjustment directly targets the soil-bearing situation at the stone discharge end, without needing to simultaneously change the operating parameters of the first and second screen sections, which helps reduce the amount of residual soil on the stone surface carried out with the discharge.

[0019] Optionally, within a sampling period, when the ratio of the number of non-stone soil clumps to the total amount of discharged material is not lower than the second stone discharge ratio threshold, the non-stone soil clumps are returned to the first screen section, and the amplitude of the first screen section after adjustment is greater than the amplitude before adjustment, and greater than the current amplitude of the second screen section, so that the returned non-stone soil clumps are loosened again before entering the second screen section.

[0020] Beneficial effects: When the proportion of non-stone soil clumps reaches the threshold of the second stone discharge ratio, they are returned to the first screening section. The adjusted amplitude of the first screening section is greater than the original amplitude and the current amplitude of the second screening section, allowing the returned soil clumps to undergo stronger throwing and collision. The loosened fine soil then enters the second screening section for sieving, thereby reducing the continuous discharge of intact soil clumps from the stone discharge end and retaining the soil that can be sieved.

[0021] Optionally, during continuous screening, if the ratio of the number of soil-bearing stones to the total number of discharged materials is not lower than the first stone discharge ratio threshold for at least two consecutive sampling cycles, then the vibration frequency and discharge speed of the third screening section are updated. If the ratio of the number of non-stone soil clumps to the total amount of discharge is not lower than the second stone discharge ratio threshold for at least two consecutive sampling periods, then update the amplitude and number of intermittent impacts of the first sieve segment. If the ratio of the number of residual stones in the screened soil to the total number of screened materials is not lower than the third ratio threshold, then update the vibration direction of the second screen section or the amplitude of the vibration in the direction perpendicular to the screen surface.

[0022] Beneficial effects: Employing a judgment condition of at least two consecutive sampling cycles avoids immediate parameter switching caused by single material fluctuations or detection errors. Based on the detection results of three categories—soil-bearing lumps, non-stone soil clumps, and residual stones under the sieve—the corresponding parameters of the third, first, and second sieve sections are adjusted respectively, ensuring that parameter adjustments correspond to the screening stages where anomalies occur. This reduces frequent and untargeted adjustments and maintains the stability of the continuous screening process.

[0023] Secondly, this application provides a soil-rock separation system based on vibration modulation coupled with moisture content and particle size, the system comprising: A conveying module is used to convey the soil-rock mixture to a vibrating screening device, wherein the vibrating screening device is provided with a first screen section, a second screen section and a third screen section in sequence along the material movement direction; The parameter setting module is used to acquire the moisture content and particle size distribution information of the soil-rock mixture before it enters the vibrating screening device, and to determine the vibration parameters corresponding to the first screen section, the second screen section and the third screen section respectively based on the moisture content and particle size distribution information. The segmented vibrating screen module is used to control the first screen section to vibrate and loosen the soil-rock mixture according to the corresponding vibration parameters, so that the soil clumps are broken and the soil attached to the surface of the stones is loosened; the second screen section is controlled to screen according to the corresponding vibration parameters, so that the fine soil falls through the screen holes and the stones continue to move to the third screen section; the third screen section is controlled to vibrate and desorb according to the corresponding vibration parameters, so that the residual soil on the surface of the stones is removed. The discharge identification module is used to acquire detection information of the discharge from the third screening section and identify soil-bearing stones and soil clumps in the discharge based on the detection information. The soil removal control module is used to increase the vibration intensity of the third screen section and reduce the discharge speed when the proportion of soil-bearing stones exceeds the preset range, so as to prolong the soil removal time of the soil-bearing stones in the third screen section. The return module is used to return the soil clump material to the first screen section when the proportion of soil clump material exceeds a preset range, and simultaneously increase the vibration intensity of the first screen section relative to the second screen section, so as to increase the degree of crushing of the returned soil clump in the first screen section. The parameter update module is used to update the vibration parameters of the first, second, and third screen sections based on the proportion of soil and stones, the proportion of soil clumps, and the residual stones in the screened soil. This update is then used for screening the soil-stone mixture that subsequently enters the vibrating screening device. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A flowchart of a soil-rock separation method based on vibration tuning coupled with moisture content and particle size is provided in one embodiment of this application; Figure 2 This is a schematic diagram of a soil-rock separation system based on the coupling of moisture content and particle size for vibration regulation, provided as an embodiment of this application. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0028] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0029] Example 1 In farmland improvement, sand-stabilized land renovation, and reclamation of stony farmland, the topsoil to be treated typically contains stones, fine soil, and wet clay clumps. When the moisture content increases, the clay clumps are difficult to break up, and the soil adhering to the stones is also difficult to remove. If the same vibration parameters are used for each screening section, it is easy for soil clumps to be discharged with the stones, insufficient screening of fine soil, or stones to be discharged with soil attached. This embodiment controls three screening sections separately according to the feed state and uses the discharge detection results for feedback adjustments.

[0030] See Figure 1 The soil-rock separation method in this embodiment is carried out according to the following steps: Step 1: The soil and rock mixture is conveyed to the vibrating screen device, which is equipped with a first screen section, a second screen section and a third screen section in sequence along the material movement direction; The soil-rock mixture is fed into the vibrating screening device by an upstream conveying mechanism and passes through the first, second, and third screening sections sequentially. The first screening section is used to loosen the soil clumps and remove the attached soil from the surface of the rocks; the second screening section is used to allow fine soil to pass through the screen holes; and the third screening section is used to turn over the rocks and remove residual soil. Each of the three screening sections can be equipped with a separate vibrator, or they can be driven by the same vibration source through different transmission mechanisms, as long as the corresponding vibration parameters can be adjusted separately. In this embodiment, the first screening section uses low-frequency, large-amplitude vibration; the second screening section uses elliptical vibration with a displacement component along the screen surface; and the third screening section uses vibration at a higher frequency than the first screening section.

[0031] Step 2: Before the soil-rock mixture enters the vibrating screen, obtain the moisture content and particle size distribution information of the soil-rock mixture, and determine the vibration parameters corresponding to the first screen section, the second screen section and the third screen section respectively based on the moisture content and particle size distribution information; The feed end is equipped with a moisture content detection unit and a material image or contour acquisition unit. Moisture content is the ratio of water mass to the total mass of the soil-rock mixture; particle size distribution information is obtained from the projected equivalent diameter, including the proportion of fine soil and large particles. The controller compares the above data with preset thresholds and selects amplitude, frequency, vibration direction, vibration trajectory parameters, and conveying speed for each screen segment. In this embodiment, when the moisture content is not lower than the first moisture content threshold and the proportion of large particles is not lower than the first large particle proportion threshold, the amplitude of the first screen segment can be set to 15mm, the frequency to 8Hz, and the frequency of the third screen segment can be set to 25Hz. The above values ​​are used to illustrate the parameter setting method; specific values ​​can be calibrated according to soil type, screen size, and processing capacity.

[0032] Step 3: Control the first screen section to vibrate and loosen the soil-rock mixture according to the corresponding vibration parameters, causing the soil clumps to break up and loosening the soil attached to the surface of the rocks; control the second screen section to screen according to the corresponding vibration parameters, allowing the fine soil to fall through the screen holes and the rocks to continue moving to the third screen section; control the third screen section to vibrate and desorb according to the corresponding vibration parameters, causing the residual soil on the surface of the rocks to fall off. The first screening section uses vertical vibration and intermittent impact to throw soil clumps up and back onto the screen surface, causing them to break down. Simultaneously, it loosens the soil adhering to the stones. After entering the second screening section, the material spreads and moves forward along the screen surface. Fine soil passes through the screen holes under gravity and vibration, while larger stones and partially loosened material continue into the third screening section. In the third screening section, a large acceleration perpendicular to the screen surface causes the stones to tumble and collide. Residual soil falls off and falls through the screen holes or gaps in the screen surface, while the stones are discharged from the stone discharge end.

[0033] Step 4: Obtain the detection information of the discharge from the third screening stage, and identify the soil-bearing rocks and soil clumps in the discharge based on the detection information; The third screening section, at the stone discharge end, is equipped with image and sound acquisition devices. Image information is used to calculate the soil coverage percentage of the discharged material, while sound information is used to acquire the dominant frequency of the discharged material impacting the detection plate. Soil-bearing stones are materials with a hard core and still having soil adhering to the surface; non-stone clumps are aggregated soil without a stone core. The controller classifies the discharged material based on the comparison results of the two detection data points with corresponding thresholds and counts the quantity of each type of material within the sampling period.

[0034] Step 5: When the proportion of soil-bearing stones exceeds the preset range, increase the vibration intensity of the third screen section and reduce the discharge speed to prolong the soil-bearing stones' desoiling time in the third screen section. The ratio of soil-bearing stones to total discharge volume within a sampling period is defined as the ratio of the number of soil-bearing stones to the total discharge volume. When this ratio exceeds a set range, the controller increases the vibration frequency of the third screen section and decreases the discharge speed. In this embodiment, the vibration frequency of the third screen section can be adjusted from 20Hz to 28Hz, and the discharge speed can be reduced by 20%. After adjustment, the residence time and vibration frequency of soil-bearing stones in the third screen section increase to further remove surface soil.

[0035] Step 6: When the proportion of soil material exceeds the preset range, the soil material is returned to the first screen section, and the vibration intensity of the first screen section relative to the second screen section is increased at the same time to increase the degree of crushing of the returned soil material in the first screen section. The proportion of non-rock clumps is the ratio of the number of non-rock clumps to the total amount of effluent within a sampling period. When this ratio exceeds a set range, the return channel, screw conveyor, or scraper conveyor returns the non-rock clumps to the inlet of the first screening section. Simultaneously, the amplitude of the first screening section is increased to be greater than the current amplitude of the second screening section. For example, the amplitude of the first screening section can be adjusted from 10mm to 18mm, while the amplitude of the second screening section remains unchanged, causing the returned clumps to loosen again before entering the second screening section.

[0036] Step 7: Based on the proportion of soil and stones, the proportion of soil clumps, and the residual stones in the screened soil, update the vibration parameters of the first, second, and third screen sections, and use them for subsequent screening of soil and stone mixtures entering the vibrating screening device.

[0037] The undersize soil detection unit is used to count residual stones in the undersize material. The controller adjusts the corresponding screen sections based on three types of feedback: when the proportion of soil-stone mixture is too high, the vibration frequency and discharge speed of the third screen section are adjusted; when the proportion of non-stone soil clumps is too high, the amplitude and number of intermittent impacts of the first screen section are adjusted; when the proportion of residual stones in the undersize is too high, the vibration direction or amplitude perpendicular to the screen surface of the second screen section is adjusted. The updated parameters are used for subsequent continuously entering soil-stone mixtures, ensuring that the adjustments of each screen section correspond to the respective screening anomalies.

[0038] Example 2 This embodiment illustrates the process of obtaining particle size distribution information of soil-rock mixtures.

[0039] Step 1: Obtain particle size distribution information by collecting surface images or contour information of the soil-rock mixture; An industrial camera, linear scan camera, or laser profilometer is installed above the feed conveyor belt to collect surface images or contour data of the soil-rock mixture. After preprocessing and edge extraction of the collected data, the boundaries and projected areas of each material region are obtained. In this embodiment, the soil-rock mixture passes through the detection zone at a speed of 0.5 m / s, and the camera collects images at a frequency of 30 frames per second. This acquisition method does not involve contact with the material and can obtain the data required for particle size statistics during continuous material conveying.

[0040] Step 2: Calculate the proportion of fine soil and large material based on the equivalent diameter of the material projection; The projected equivalent diameter is the diameter of a circle with the same projected area as the material. The controller calculates the projected area of ​​each independent material region within the collection area and converts it into a projected equivalent diameter. Material regions with a projected equivalent diameter smaller than the first particle size threshold are classified as fine soil, while material regions with a projected equivalent diameter larger than the second particle size threshold are classified as large materials. The proportion of each type of region to the total area of ​​the collection area is then calculated. For example, if the projected area of ​​a soil clump is 2500 mm², its projected equivalent diameter is approximately 56.4 mm; when the first particle size threshold is 10 mm and the second particle size threshold is 40 mm, this soil clump is classified as large material.

[0041] Materials with a projected equivalent diameter between the first and second particle size thresholds are categorized as intermediate particle size materials, and are not included in the fine soil ratio or the proportion of large particles. By retaining the intermediate particle size range, materials near the critical particle size can be avoided from being directly divided between fine soil and large particles. The statistically obtained proportions of fine soil and large particles correspond to the moisture content data of the same sampling period and are used as inputs for setting vibration parameters.

[0042] This embodiment uses image or contour data to determine the proportion of fine soil and large material, eliminating the need to stop the machine for screening and sampling. The statistical results are used to determine the current material's screening and agglomeration requirements, and together with the moisture content, are used to determine the initial vibration parameters for the three screening sections.

[0043] Example 3 This embodiment illustrates the method for generating the initial vibration parameters in step S2.

[0044] Among them, when the moisture content is not lower than the first moisture content threshold and the proportion of large pieces of material is not lower than the first large piece proportion threshold, the amplitude of the first screen section is made greater than the amplitude of the second screen section. When the proportion of fine soil is not lower than the first fine soil proportion threshold, the vibration displacement component of the second screen section along the screen surface direction is greater than the vibration displacement component of the first screen section along the screen surface direction.

[0045] Step 1: The moisture content, fine soil ratio, and large material ratio obtained in step S2 are compared with the corresponding thresholds and used to generate the initial vibration parameters for the first, second, and third screen sections. The moisture content is the ratio of the mass of water to the total mass of the soil-rock mixture; the proportion of fine soil and the proportion of large materials are obtained according to the method described in Example 2. The first moisture content threshold, the first large material proportion threshold, and the first fine soil proportion threshold can be pre-calibrated according to the soil to be treated and the screening requirements. The controller compares the above data with the corresponding thresholds, and selects the amplitude, frequency, vibration direction, and vibration trajectory parameters of the first, second, and third screening sections based on the comparison results. For example, if the first moisture content threshold is set to 18% and the first large material proportion threshold is set to 30%, and the detected moisture content is 22% and the proportion of large materials is 35%, then the parameters of each screening section are set according to the relationship of high moisture content and high proportion of large materials.

[0046] Step 2: When the moisture content is not lower than the first moisture content threshold and the proportion of large pieces of material is not lower than the first large piece proportion threshold, make the amplitude of the first screen section greater than the amplitude of the second screen section. When the moisture content is not lower than the first moisture content threshold and the proportion of large pieces of material is not lower than the first large piece proportion threshold, the amplitude of the first screen section is made greater than that of the second screen section. For example, the amplitude of the first screen section is set to 15 mm, and the amplitude of the second screen section is set to 8 mm. The larger amplitude of the first screen section is used to increase the height of the soil clumps thrown up and the impact when they fall back onto the screen surface, while the smaller amplitude of the second screen section is used to maintain the material spreading and the passage of fine soil. This amplitude relationship is used to handle working conditions with a high proportion of wet clay clumps.

[0047] Step 3: When the proportion of fine soil is not lower than the first fine soil proportion threshold, make the vibration displacement component of the second screen section along the screen surface direction greater than the vibration displacement component of the first screen section along the screen surface direction. When the proportion of fine soil is not lower than the first fine soil proportion threshold, the vibration displacement component of the second screen section along the screen surface direction is made greater than that of the first screen section along the screen surface direction. For example, if the displacement component of the first screen section along the screen surface direction is set to 3mm, the corresponding displacement component of the second screen section is set to 6mm. The first screen section is still mainly vertically loose, while the second screen section uses a larger displacement along the screen surface direction to spread and move the material forward, so that the fine soil can approach the screen holes and fall.

[0048] Example 4 This embodiment illustrates the composite vibration control method for the first sieve section.

[0049] Step 1: During the screening process in the first screening section, control the first screening section to form a vibration process that includes a vertical vibration stage and an intermittent impact stage, so that the soil clumps entering the first screening section are thrown up, fall back and crack. The vertical vibration stage causes the first screen section to reciprocate periodically along the direction perpendicular to the screen surface, causing the soil clump to leave the screen surface and fall back. The intermittent impact stage briefly increases the excitation intensity at predetermined intervals. The two stages can be performed alternately, or the intermittent impact can be superimposed during the vertical vibration. In this embodiment, the vertical vibration frequency is set to 8Hz and the amplitude is set to 10mm. An impact lasting 0.2 seconds is superimposed every 2 seconds, and the acceleration during the impact is 3 to 5 times the acceleration due to gravity. The soil clump gradually cracks and loosens during the repeated throwing, falling, and collision processes.

[0050] Step 2: When the moisture content is not lower than the first moisture content threshold, the vertical amplitude of the first sieve segment after adjustment is greater than the vertical amplitude before adjustment.

[0051] The first moisture content threshold can be calibrated based on the soil to be treated. The vertical amplitude before adjustment is the baseline value determined based on the initial particle size distribution. When the real-time moisture content is not lower than the first moisture content threshold, the controller increases the vertical amplitude of the first screen section. For example, if the first moisture content threshold is set to 20%, and the detected moisture content is 25%, the vertical amplitude can be adjusted from 10mm to 18mm. The increased vertical displacement allows the soil clumps to achieve a greater throwing height and receive a stronger impact when falling back onto the screen surface, thereby loosening the wet clay clumps in conjunction with the intermittent impact stage.

[0052] Example 5 This embodiment illustrates the vibration trajectory setting method for the second and third screen sections.

[0053] Step 1: When screening in the second and third screen sections, make the displacement component along the screen surface in the vibration trajectory of the second screen section greater than the displacement component along the screen surface in the third screen section. The displacement component along the screen surface direction is the projected length of the vibration trajectory in the direction parallel to the screen surface. The second screen section is used to spread and move the loosened material forward and complete the screening of fine soil; therefore, its displacement component along the screen surface direction is set to be greater than the corresponding displacement component of the third screen section. When the proportion of fine soil is not lower than the first fine soil proportion threshold, the major axis direction of the elliptical vibration trajectory of the second screen section can be adjusted to be close to the screen surface direction, so that the single-cycle displacement along the screen surface direction is 15mm and the displacement perpendicular to the screen surface direction is 6mm.

[0054] Step 2: Make the acceleration component perpendicular to the screen surface in the vibration trajectory of the third screen section greater than the acceleration component perpendicular to the screen surface in the second screen section; The acceleration component perpendicular to the screen surface is the peak acceleration perpendicular to the screen surface during vibration. The third screen section is used to flip the stones and remove surface soil, therefore its acceleration component perpendicular to the screen surface is set to be greater than the corresponding acceleration component of the second screen section. This acceleration can be changed by adjusting the vibrator speed or eccentricity. In this embodiment, the acceleration perpendicular to the screen surface of the third screen section is 3 to 4 times the gravitational acceleration, and the acceleration of the second screen section is 1.5 to 2 times the gravitational acceleration, causing the stones to be repeatedly thrown up, fallen back, and collided within the third screen section.

[0055] Step 3: This causes the fine soil to fall through the sieve holes in the second sieve section and the stones to be flipped and de-soiled in the third sieve section.

[0056] According to the vibration trajectory settings described above, the second screening section mainly utilizes displacement along the screen surface to spread the fine soil and allow it to pass through the screen holes, while the third screening section mainly utilizes acceleration perpendicular to the screen surface to cause the stones to flip and de-soil. Thus, the fine soil passing through the screen and the stones being de-soiled occur in their respective screening sections, reducing the likelihood of material being discharged from the stone discharge end before it has been fully screened or de-soiled.

[0057] Example 6 This embodiment illustrates the classification method of the discharged materials in step S4.

[0058] Step 1: Use the image information of the discharge to obtain the soil coverage area ratio, and use the impact sound information of the discharge to obtain the main frequency of the impact sound; A visual acquisition device and an acoustic sensor are installed at the stone discharge end of the third screening section. The visual acquisition device acquires images of the discharged material surface, identifies soil characteristic areas after grayscale processing or color segmentation, and calculates the proportion of the soil coverage area to the projected area of ​​the discharged material. When the discharged material falls onto the detection plate, the acoustic sensor collects the impact sound, performs a Fast Fourier Transform on the sound signal, and takes the frequency corresponding to the peak value of the spectrum as the dominant frequency of the impact sound. The dominant frequency of the impact sound of stones is usually higher than that of wet clay clumps, so the two data can be used together to distinguish whether the discharged material surface is covered with soil and whether it has a hard core.

[0059] Step 2: When the soil coverage area is less than the first coverage threshold and the main frequency of the impact sound is not lower than the first sound threshold, the discharge is identified as stones. The first coverage threshold is used to determine the degree of soil adhesion on the surface of the discharge, and the first sound threshold is used to determine whether the discharge has a hard core. When the soil coverage area is less than the first coverage threshold and the dominant frequency of the impact sound is not lower than the first sound threshold, the discharge is identified as a rock. For example, if the first coverage threshold is set to 10% and the first sound threshold is set to 2000Hz, and the soil coverage area of ​​a certain discharge is 5% and the dominant frequency of the impact sound is 2500Hz, then it is counted as a rock.

[0060] Step 3: When the soil coverage area is not less than the first coverage threshold and the main frequency of the impact sound is not lower than the first sound threshold, the discharge is identified as soil-bearing rocks. When the soil coverage area is not less than the first coverage threshold and the dominant frequency of the impact sound is not lower than the first sound threshold, it indicates that the discharge has a hard core but still has soil attached to the surface, and it is identified as soil-bearing rocks. For example, if the soil coverage area of ​​a discharge is 40% and the dominant frequency of the impact sound is 2200Hz, it is included in the number of soil-bearing rocks. This statistical result is used to determine whether it is necessary to increase the vibration frequency of the third screen section and reduce the discharge speed.

[0061] Step 4: When the soil coverage area is not less than the second coverage threshold and the main frequency of the impact sound is lower than the first sound threshold, the discharge is identified as a non-stone soil clump, wherein the second coverage threshold is greater than the first coverage threshold. The second coverage threshold is higher than the first coverage threshold and is used to distinguish materials with a high surface soil cover from general soil-bearing materials. When the soil coverage area is not less than the second coverage threshold and the dominant frequency of the impact sound is lower than the first sound threshold, the discharge is identified as a non-rock clump. For example, if the second coverage threshold is set to 80%, and the soil coverage area of ​​a certain discharge is 90% and the dominant frequency of the impact sound is 800Hz, then it will be included in the number of non-rock clumps and used as the basis for determining whether to initiate a feedback process.

[0062] Example 7 This embodiment illustrates the adjustment method for the third screening section when the proportion of soil and rocks exceeds the limit.

[0063] Step 1: Within a sampling period, when the ratio of the number of soil-bearing rocks to the total amount of discharged material is not lower than the first discharge ratio threshold; The sampling period is the time window during which the controller statistically analyzes the discharge and performs a judgment. It can be set according to the material flow rate and processing volume. In this embodiment, the sampling period is set to 10 seconds, and the first stone discharge ratio threshold is set to 10%. The controller counts the number of soil-bearing stones and the total amount of discharge within this period. When the ratio of the two is not lower than the first stone discharge ratio threshold, it determines that the current soil removal effect of the third screen section is insufficient and triggers parameter adjustment.

[0064] Step 2: Set the vibration frequency of the third screen section after adjustment to be greater than the vibration frequency before adjustment, and set the discharge speed of the third screen section after adjustment to be less than the discharge speed before adjustment, so as to increase the residence time of soil and stone blocks in the third screen section. After triggering the adjustment, the vibration frequency of the third screen section is increased, and the discharge velocity along the material conveying direction is decreased. In this embodiment, the vibration frequency can be adjusted from 20Hz to 25Hz, and the discharge velocity from 0.5m / s to 0.4m / s. Increasing the vibration frequency increases the number of vibrations experienced by the soil-bearing stones per unit time; decreasing the discharge velocity prolongs their residence time within the third screen section. The adjustment amounts for both parameters can be further corrected based on the proportion of soil-bearing stones in subsequent sampling periods.

[0065] Example 8 This embodiment illustrates the method of reprocessing and adjusting the first screening section when the proportion of non-stone soil clumps exceeds the limit.

[0066] Step 1: Within a sampling period, when the ratio of the number of non-rock clumps to the total amount of discharge is not lower than the second stone discharge ratio threshold, the non-rock clumps are returned to the first screening section. Non-rock clumps are aggregated soils that do not contain hard stone cores, determined based on the proportion of soil cover area and the dominant frequency of impact sound. When the ratio of the number of non-rock clumps to the total amount of discharged material within a sampling period is not lower than the second stone discharge ratio threshold, the controller activates the return mechanism. The return mechanism can employ a return conveyor belt or a screw conveyor to send the identified non-rock clumps back from the stone discharge end to the inlet of the first screening section, allowing them to undergo loosening and screening again.

[0067] Step 2: Adjust the amplitude of the first screening section to be greater than the amplitude before adjustment, and also greater than the current amplitude of the second screening section, so that the non-stone soil clumps after being returned are loosened again before entering the second screening section. Upon receiving the feedback signal, the controller increases the amplitude of the first screening section, making the adjusted amplitude greater than the original amplitude and also greater than the current amplitude of the second screening section. For example, if the current amplitude of the second screening section is 6mm and the original amplitude of the first screening section is 10mm, the amplitude of the first screening section can be adjusted to 15mm. The returned soil clumps are subjected to strong throwing and collision within the first screening section before entering the second screening section, allowing the loosened fine soil to pass through the screen openings.

[0068] Example 9 This embodiment illustrates the parameter update method in the continuous screening process.

[0069] Step 1: If the ratio of the number of soil-bearing rocks to the total amount of discharged material is not lower than the first discharge ratio threshold for at least two consecutive sampling periods, then update the vibration frequency and discharge speed of the third screen segment. At the end of each sampling cycle, the controller calculates the ratio of the number of soil-bearing stones to the total amount of discharged material and compares it with the first stone discharge ratio threshold. The vibration frequency and discharge speed of the third screen section are only updated if the ratio is not lower than the first stone discharge ratio threshold for at least two consecutive sampling cycles; if the limit is exceeded only in a single sampling cycle, the current parameters are maintained to reduce frequent adjustments caused by uneven instantaneous material distribution or detection fluctuations.

[0070] For example, if the threshold for the proportion of stones in the first discharge is set to 15%, and the proportion of soil-bearing stones in two consecutive 2-second sampling cycles is 18% and 20% respectively, the vibration frequency of the third screening section can be adjusted from 20Hz to 25Hz, and the discharge velocity can be adjusted from 0.5m / s to 0.3m / s. The updated parameters are used for subsequent materials entering the third screening section, and further judgment is made based on the new sampling results.

[0071] Step 2: If the ratio of the number of non-stone soil clumps to the total amount of discharged material is not lower than the second stone discharge ratio threshold for at least two consecutive sampling periods, then update the amplitude and number of intermittent impacts of the first sieve segment. For non-rock clumps, the controller uses the same continuous periodic judgment method. When the ratio of the number of non-rock clumps to the total amount of discharged material is not lower than the second stone discharge ratio threshold for at least two consecutive sampling periods, it is determined that the current loosening effect of the first screen section is insufficient, and the amplitude and number of intermittent impacts of the first screen section are updated.

[0072] For example, if the threshold for the second run of stones is set to 10%, and the proportion of non-stone soil clumps is 12% for two consecutive sampling periods, the amplitude of the first screening section can be adjusted from 10mm to 15mm, and the number of intermittent impacts per minute can be adjusted from 5 to 8. The adjusted parameters apply to both the returned soil clumps and the newly entered soil-stone mixture, further loosening them before they enter the second screening section.

[0073] Step 3: If the ratio of the number of residual stones in the screened soil to the total number of screened materials is not lower than the third ratio threshold, then update the vibration direction of the second screen section or the amplitude of the vibration in the direction perpendicular to the screen surface.

[0074] The residual stones in the undersize soil are small stones that fall through the sieve holes into the undersize material during the second sieve section. The undersize soil detection unit calculates the ratio of the number of residual stones to the total amount of undersize material detected within a sampling period; when this ratio is not lower than a third ratio threshold, it is determined that the vibration direction of the second sieve section or the amplitude in the direction perpendicular to the sieve surface needs to be adjusted.

[0075] The parameters of the second screening section can be adjusted in one of the following ways: change the phase angle of the vibrator to increase the displacement component of the vibration trajectory along the screen surface; or reduce the amplitude in the direction perpendicular to the screen surface to reduce the possibility of small stones passing through the screen holes. For example, when the third proportional threshold is set to 5% and the detection ratio is 6%, the length of the minor axis of the elliptical vibration trajectory in the vertical direction of the second screening section can be reduced, or the inclination angle of the major axis can be adjusted to make the material move more along the screen surface to the stone discharge end.

[0076] Figure 2 A schematic diagram of a soil-rock separation system based on the coupled vibration regulation of moisture content and particle size is provided in one embodiment of this application, as shown below. Figure 2 As shown, a soil-rock separation system 300 based on moisture content and particle size coupling vibration adjustment in this embodiment includes: a conveying module 301, a parameter setting module 302, a segmented vibrating screen module 303, a discharge identification module 304, a soil removal control module 305, a return module 306, and a parameter update module 307.

[0077] The conveying module 301 is used to convey the soil-rock mixture to the vibrating screening device, which is provided with a first screen section, a second screen section and a third screen section in sequence along the material movement direction; The parameter setting module 302 is used to acquire the moisture content and particle size distribution information of the soil-rock mixture before it enters the vibrating screening device, and to determine the vibration parameters corresponding to the first screen section, the second screen section and the third screen section respectively based on the moisture content and particle size distribution information. The segmented vibrating screen module 303 is used to control the first screen section to vibrate and loosen the soil-rock mixture according to the corresponding vibration parameters, so that the soil clumps are broken and the soil attached to the surface of the stones is loosened; to control the second screen section to screen according to the corresponding vibration parameters, so that the fine soil falls through the screen holes and the stones continue to move to the third screen section; and to control the third screen section to vibrate and desorb according to the corresponding vibration parameters, so that the residual soil on the surface of the stones falls off. The discharge identification module 304 is used to acquire detection information of the discharge from the third screening section and identify soil-bearing stones and soil clumps in the discharge based on the detection information. The soil removal control module 305 is used to increase the vibration intensity of the third screen section and reduce the discharge speed when the proportion of soil-bearing stones exceeds the preset range, so as to prolong the soil removal time of soil-bearing stones in the third screen section. The return module 306 is used to return the soil clump material to the first screen section when the proportion of soil clump material exceeds a preset range, and simultaneously increase the vibration intensity of the first screen section relative to the second screen section, so as to increase the degree of crushing of the returned soil clump in the first screen section. The parameter update module 307 is used to update the vibration parameters of the first, second, and third screen sections based on the proportion of soil and stones, the proportion of soil clumps, and the residual stones in the screened soil, and is used for subsequent screening of soil and stone mixtures entering the vibrating screening device.

[0078] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for soil-rock separation based on coupled vibration regulation of moisture content and particle size, characterized in that, include: S1. The soil-rock mixture is conveyed to a vibrating screening device, wherein the vibrating screening device is provided with a first screen section, a second screen section and a third screen section in sequence along the material movement direction; S2. Before the soil-rock mixture enters the vibrating screening device, the moisture content and particle size distribution information of the soil-rock mixture are obtained, and the vibration parameters corresponding to the first screen section, the second screen section and the third screen section are determined according to the moisture content and particle size distribution information. S3. Control the first screen section to vibrate and loosen the soil-rock mixture according to the corresponding vibration parameters, so that the soil clumps are broken and the soil attached to the surface of the stones is loosened; control the second screen section to screen according to the corresponding vibration parameters, so that the fine soil falls through the screen holes and the stones continue to move to the third screen section; control the third screen section to vibrate and desorb according to the corresponding vibration parameters, so that the residual soil on the surface of the stones falls off. S4. Obtain the detection information of the discharge from the third screening section, and identify the soil-bearing stones and soil clumps in the discharge based on the detection information; S5. When the proportion of soil-bearing stones exceeds the preset range, increase the vibration intensity of the third screen section and reduce the discharge speed to prolong the soil-bearing stones' desoiling time in the third screen section. S6. When the proportion of soil material exceeds the preset range, the soil material is returned to the first screen section, and the vibration intensity of the first screen section relative to the second screen section is increased simultaneously to increase the degree of crushing of the returned soil material in the first screen section. S7. Based on the proportion of soil and stones, the proportion of soil clumps, and the residual stones in the screened soil, update the vibration parameters of the first, second, and third screen sections, and use them for subsequent screening of soil and stone mixtures entering the vibrating screening device.

2. The method according to claim 1, characterized in that, In step S2, the particle size distribution information is obtained by collecting surface images or contour information of the soil-rock mixture, and the proportion of fine soil and large material is calculated according to the equivalent diameter of the material projection. Among them, the proportion of fine soil is the proportion of material areas with a projected equivalent diameter smaller than the first particle size threshold in the collection area, and the proportion of large material is the proportion of material areas with a projected equivalent diameter greater than the second particle size threshold in the collection area, wherein the second particle size threshold is greater than the first particle size threshold.

3. The method according to claim 2, characterized in that, The moisture content, fine soil ratio, and large material ratio obtained in step S2 are compared with the corresponding thresholds and used to generate the initial vibration parameters for the first, second, and third screen sections. Among them, when the moisture content is not lower than the first moisture content threshold and the proportion of large pieces of material is not lower than the first large piece proportion threshold, the amplitude of the first screen section is made greater than the amplitude of the second screen section. When the proportion of fine soil is not lower than the first fine soil proportion threshold, the vibration displacement component of the second screen section along the screen surface direction is greater than the vibration displacement component of the first screen section along the screen surface direction.

4. The method according to claim 3, characterized in that, During the screening process in the first screening section, the first screening section is controlled to form a vibration process that includes a vertical vibration stage and an intermittent impact stage, so that the soil clumps entering the first screening section are thrown up, fall back and crack. When the moisture content is not lower than the first moisture content threshold, the vertical amplitude of the first sieve segment after adjustment is greater than the vertical amplitude before adjustment.

5. The method according to claim 3, characterized in that, During screening in the second and third screening sections, the displacement component along the screen surface in the vibration trajectory of the second screening section is made greater than the displacement component along the screen surface in the third screening section, and the acceleration component perpendicular to the screen surface in the vibration trajectory of the third screening section is made greater than the acceleration component perpendicular to the screen surface in the second screening section. This results in fine soil mainly falling through the screen holes in the second screening section, and stones mainly turning over and being de-soiled in the third screening section.

6. The method according to claim 1, characterized in that, In step S4, the image information of the discharge is used to obtain the soil coverage area ratio, and the impact sound information of the discharge is used to obtain the main frequency of the impact sound. When the soil coverage area is less than the first coverage threshold and the main frequency of the impact sound is not lower than the first sound threshold, the discharge is identified as stones. When the soil coverage area is not less than the first coverage threshold and the main frequency of the impact sound is not lower than the first sound threshold, the discharge is identified as soil-bearing rocks. When the soil coverage area is not less than the second coverage threshold and the dominant frequency of the impact sound is lower than the first sound threshold, the discharge is identified as a non-rock clump. The second coverage threshold is greater than the first coverage threshold.

7. The method according to claim 6, characterized in that, Within a sampling period, when the ratio of the number of soil-bearing stones to the total number of discharged materials is not lower than the first stone discharge ratio threshold, the vibration frequency of the third screen section after adjustment is set to be greater than the vibration frequency before adjustment, and the discharge speed of the third screen section after adjustment is set to be less than the discharge speed before adjustment, so that the residence time of soil-bearing stones in the third screen section is increased.

8. The method according to claim 7, characterized in that, Within a sampling period, when the ratio of the number of non-rock clumps to the total amount of discharge is not less than the second stone discharge ratio threshold, the non-rock clumps are returned to the first screen section, and the amplitude of the first screen section after adjustment is greater than the amplitude before adjustment, and greater than the current amplitude of the second screen section, so that the returned non-rock clumps are loosened again before entering the second screen section.

9. The method according to claim 8, characterized in that, During continuous screening, if the ratio of the number of soil-bearing stones to the total number of discharged materials is not lower than the first stone discharge ratio threshold for at least two consecutive sampling periods, then the vibration frequency and discharge speed of the third screening section are updated. If the ratio of the number of non-stone soil clumps to the total amount of discharge is not lower than the second stone discharge ratio threshold for at least two consecutive sampling periods, then update the amplitude and number of intermittent impacts of the first sieve segment. If the ratio of the number of residual stones in the screened soil to the total number of screened materials is not lower than the third ratio threshold, then update the vibration direction of the second screen section or the amplitude of the vibration in the direction perpendicular to the screen surface.

10. A soil-rock separation system based on vibration modulation coupled with moisture content and particle size, characterized in that, include: A conveying module is used to convey the soil-rock mixture to a vibrating screening device, wherein the vibrating screening device is provided with a first screen section, a second screen section and a third screen section in sequence along the material movement direction; The parameter setting module is used to acquire the moisture content and particle size distribution information of the soil-rock mixture before it enters the vibrating screening device, and to determine the vibration parameters corresponding to the first screen section, the second screen section and the third screen section respectively based on the moisture content and particle size distribution information. The segmented vibrating screen module is used to control the first screen section to vibrate and loosen the soil-rock mixture according to the corresponding vibration parameters, so that the soil clumps are broken and the soil attached to the surface of the stones is loosened; the second screen section is controlled to screen according to the corresponding vibration parameters, so that the fine soil falls through the screen holes and the stones continue to move to the third screen section; the third screen section is controlled to vibrate and desorb according to the corresponding vibration parameters, so that the residual soil on the surface of the stones is removed. The discharge identification module is used to acquire detection information of the discharge from the third screening section and identify soil-bearing stones and soil clumps in the discharge based on the detection information. The soil removal control module is used to increase the vibration intensity of the third screen section and reduce the discharge speed when the proportion of soil-bearing stones exceeds the preset range, so as to prolong the soil removal time of the soil-bearing stones in the third screen section. The return module is used to return the soil clump material to the first screen section when the proportion of soil clump material exceeds a preset range, and simultaneously increase the vibration intensity of the first screen section relative to the second screen section, so as to increase the degree of crushing of the returned soil clump in the first screen section. The parameter update module is used to update the vibration parameters of the first, second, and third screen sections based on the proportion of soil and stones, the proportion of soil clumps, and the residual stones in the screened soil. This update is then used for screening the soil-stone mixture that subsequently enters the vibrating screening device.

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