Spiral adjustable vibration screening instrument and screening optimization method thereof

Abstract

The invention discloses a spiral adjustable vibration screening instrument and a screening optimization method thereof, and belongs to the technical field of soil screening. A vibration screening box comprises a vibration adjusting frame and a multi-layer spiral screening assembly; the vibration adjusting frame comprises a vibration tray, a screw rod, a central column and a fixing ring; the multi-layer spiral screening assembly comprises a single-pipe spiral flow guide channel and a multi-layer spiral screening ring which communicate with each other from top to bottom, the single-pipe spiral flow guide channel is arranged in the annular space and fixedly connected to the top of the center column, and the multi-layer spiral screening ring is connected to the center column in a penetrating and sleeving mode and connected to the screw. At least three layers of screening channels are arranged in the multi-layer spiral screening rings, the diameters of screening holes of the screening channels are sequentially reduced from top to bottom, a telescopic sleeve with the adjustable length is arranged between every two adjacent multi-layer spiral screening rings on the same screw, and an adjusting spring is arranged between every two adjacent screening channels. The screening instrument can adjust screening parameters in real time, so that the screening precision and the screening efficiency are improved, and the cost consumption is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of soil screening, and in particular relates to a spiral adjustable vibration screening device and a screening optimization method thereof. Background Art

[0002] Soil screening is an important preparatory process for soil testing and is crucial to ensure the accuracy and reliability of soil testing. The aggregates in the soil sample are broken up to make the sample more uniform and convenient for subsequent chemical, physical and biological analysis. Soil is graded according to different particle sizes to study the physical properties of the soil, such as particle size distribution, porosity, water retention capacity, etc. It also provides a suitable sample state for soil analysis, such as organic matter content, nutrient level, heavy metal content, etc.

[0003] The general steps of soil screening are: collect soil samples from the field or designated locations, air-dry the collected soil samples to remove excess moisture, break up soil aggregates manually or mechanically, sieve the soil samples using standard sieves (such as 2mm, 1mm, 0.5mm, 0.25mm, etc.), weigh the sieved and unsieved materials separately, record the data, and finally properly store and reserve the sieved soil samples for future use.

[0004] In the field of soil screening, especially in the screening process of soil samples, a vibration screening instrument with a standard soil sieve is usually used. The apertures of the standard soil sieves are 0.075mm, 0.25mm, 0.5mm, 1mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 13mm, 20mm, 40mm, and 60mm. At present, although traditional or commercially available vibration screening instruments can complete basic screening tasks, they have some limitations. For example, the screening efficiency is limited by the spatial design of the soil sieve, and it is impossible to dynamically optimize and adjust soil samples of different particle sizes. Traditional sieving instruments usually have multiple layers of horizontally arranged soil sieves (screens) in the sieving box. Under the control of a vibration motor, soils of different particle sizes are separated through the sieve holes after being vibrated up and down and subjected to gravity in the space formed by the same soil sieve. The interaction and influence of spatial channel slope, sieve hole size density, vibration parameters, etc. during the sieving process are not considered, which limits the adaptability to soil samples with different characteristics. Therefore, a sieving instrument that can adjust the sieving parameters in real time according to the characteristics of the soil sample is needed to improve the sieving efficiency and accuracy. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a spiral adjustable vibrating screener and a screening optimization method thereof, which is capable of adjusting screening parameters in real time to improve screening efficiency and accuracy.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions.

[0007] In a first aspect, the present invention provides a spiral adjustable vibrating screening instrument, comprising a control seat, wherein the control seat is equipped with a control unit having an external physical control button and a touch screen, a vibrating motor electrically connected to the control unit, and a vibrating screening box connected to the vibrating motor: The vibration screening box includes a vibration adjustment frame and a multi-layered spiral screening assembly; The vibration adjustment frame includes a vibration tray, a screw rod, a center column and a fixing ring. The bottom of the vibration tray is connected to the vibration motor. The center of the vibration tray is provided with a center column extending upward, and at least three screw rods extending upward are evenly arranged along the circumference with the center column as the center. The fixing ring is passed through and fixed to the top of the screw rod. The multi-layered spiral screening assembly comprises a single-tube spiral guide channel and a multi-layered spiral screening ring which are connected from top to bottom. The single-tube spiral guide channel is spirally arranged in the annular space between the fixed ring and the central column and is fixedly connected to the top of the central column. The multi-layered spiral screening ring is spirally connected to the central column through the inner sleeve and connected to the screw rod on the outer side which can be adjusted up and down. The multi-layered spiral screening ring is provided with at least three layers of screening channels with the diameters of the screen holes decreasing from top to bottom. An adjustable telescopic sleeve is provided between adjacent multi-layered spiral screening rings on the same screw, and an adjusting spring is provided between adjacent screening channels.

[0008] Furthermore, at the discharge port of the multi-layered spiral screening ring, the screening channels extend in a step-like decreasing manner, and each of the screening channels is connected to a recovery conduit.

[0009] Furthermore, the vibration screening box also includes a box shell mounted on the vibration adjustment frame, and the lower part of the box shell and the vibration tray together form a bottom storage cavity; the outer side of the screening channel and the inner side of the box shell are squeezed and sealed by a sealing strip, and the discharge port of the recovery duct passes through the side wall of the box shell.

[0010] Furthermore, a support block is provided on the upper side wall of the central column, and the support block is supported on the lower outer side of the discharge port of the single-tube spiral guide channel and is fixedly connected to the side end face of the feed port of the multi-layered spiral screening ring.

[0011] Furthermore, the inner side of the spiral of the multi-layered spiral screening ring is connected to the side of the central column through a plastic elastic strip.

[0012] Furthermore, the cross section of the screening channel of the multi-layered spiral screening ring is semicircular or arc-shaped.

[0013] Furthermore, a grinding mill and a material hopper connected to the grinding mill are connected above the single-tube spiral guide channel. The grinding mill is arranged on the control seat through a plurality of vertical support rods and is electrically connected to the control unit.

[0014] In a second aspect, the present invention provides a screening optimization method of the spiral adjustable vibrating screening instrument as described in any one of the first aspects, comprising the following steps: According to the predetermined screening efficiency standard rules, the length of the telescopic sleeve between adjacent multi-layer spiral screening rings on the same screw is set in advance, so as to achieve the sliding slope value of the adjustment channel; Select a certain amount of soil samples to be screened, put them into the grinding machine through the material hopper, and the control unit of the control seat controls the grinding machine to grind and crush; Vibration parameters (frequency and amplitude) are input through the external physical control buttons and touch screen, and the control unit controls the vibration motor to start and drive the vibration tray to perform vibration screening; After grinding, the soil sample flows downward through the single-tube spiral guide channel and falls into the uppermost screening channel with a larger diameter screen hole in the multi-layered spiral screening ring. The sliding slope, vibration parameters, and screening aperture constrained by the predetermined screening efficiency standard rules are adjusted according to the real-time monitoring of the screening efficiency, so that the soil is gradually screened downward along the spiral channel. After screening through the channel, at the discharge port of the multi-layered spiral screening ring, the recovery duct connected by the screening channel extending in a step-like decreasing manner is led out for classification and collection, and the soil screened through the bottom screening channel falls into the storage cavity below which is surrounded by the lower part of the box shell and the vibration tray.

[0015] Furthermore, the method steps for parameter constraint and real-time adjustment according to the predetermined screening efficiency standard rules are as follows: Determine the particle size range and average particle size of the soil sample to be tested, and select multiple screening channels and their different sieve hole diameters that can allow the soil of the particle size to be tested to pass through according to the average particle size of the soil sample; Based on the screening efficiency parameter relationship determined by the test, select the appropriate sieve hole distribution density, adjust the length of the adjusting spring and / or telescopic sleeve between each layer of spiral channel to change the channel slope and initially set the vibration frequency and amplitude to achieve a balance between soil particle screening speed and screening accuracy; Monitor the soil particle screening efficiency in real time, and adjust the vibration parameters of the vibration motor to optimize the screening efficiency by controlling the physical buttons and touch screen of the control unit according to the monitoring results and the relationship between the screening efficiency parameters: In the same test process, if the actual screening efficiency is lower than the predetermined screening target, increase the amplitude or increase the vibration frequency; if the screening efficiency is too high, reduce the amplitude or reduce the vibration frequency; Record the channel slope and sieve hole parameters in each screening process. Adjust the screening effect under different vibration parameters and select the optimal channel slope, vibration parameters and sieve hole parameter relationship corresponding to different soil particles.

[0016] Furthermore, the screening efficiency parameter relationship is expressed by the formula: ; Where K is the screening efficiency evaluation index; N is the normalization constant, which is used to adjust the K value range according to different soils; , , They are the efficiency evaluation influencing weight factors of vibration parameters, channel slope, and screening aperture; , are the amplitude and frequency of the vibration parameters respectively; is the channel slope α evaluation impact index function, is the expansion coefficient; D is the sieve hole diameter of the screening channel; m is the number of screening channel layers; is the experimental average diameter of the particles after grinding the soil sample to be screened; is the sieve hole distribution density of the screening channel.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the spiral adjustable vibration screening instrument and the screening optimization method thereof provided by the present invention adopt a vibration adjustment frame and a multi-layered spiral screening assembly, in which a vibration tray, a screw, a central column and a fixed ring are arranged to support, fix and accommodate the single-tube spiral guide channel and the multi-layered spiral screening ring of the multi-layered spiral screening assembly; at least three layers of screening channels with successively smaller sieve hole diameters from top to bottom are arranged in the multi-layered spiral screening ring, an adjustable-length telescopic sleeve is arranged between adjacent multi-layered spiral screening rings on the same screw, and an adjusting spring is arranged between adjacent screening channels; soil samples of different particle sizes are continuously graded and screened through a multi-layer spiral screening channel layout; the screened soil samples are continuously graded and collected through a step-like decreasing and extending screening channel structure; the slope of the screening channel is adjusted by adjusting the telescopic sleeve on the sleeved screw. In addition, based on the screening efficiency rules and real-time screening monitoring, the vibration parameters of the vibration motor are adjusted in real time through the control unit and physical control buttons to optimize the parameter relationship between the screening channel, vibration parameters and channel slope, which significantly improves the soil screening efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional schematic diagram of a spiral adjustable vibrating sieving device provided in an embodiment of the present invention.

[0019] Figure 2 A side view of a spiral adjustable vibrating screening machine provided in an embodiment of the present invention.

[0020] Figure 3 A cross-sectional view of a spiral adjustable vibrating screening device provided in an embodiment of the present invention.

[0021] Figure 4 A three-dimensional schematic diagram of a vibrating screening box provided in an embodiment of the present invention.

[0022] Figure 5 A front view of a vibrating screening box provided in an embodiment of the present invention.

[0023] Figure 6 A flow chart of a screening optimization method for a spiral adjustable vibrating screening machine provided in an embodiment of the present invention.

[0024] In the figure: 1. Control seat; 2. Physical button; 3. Touch screen; 4. Vibration motor; 5. Support rod; 6. Grinding mill; 7. Material hopper; 8. Vibration screening box; 9. Vibration tray; 10. Center column; 11. Screw; 12. Fixed ring; 13. Single-tube spiral guide channel; 14. Multi-layered spiral screening ring; 15. Adjustment spring; 16. Telescopic sleeve; 17. Support block; 18. Recovery duct; 19. Storage chamber. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Example

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a spiral adjustable vibration screening instrument, including a control seat 1, a control unit configured with external physical control buttons and a touch screen 3, a vibration motor 4 electrically connected to the control unit, and a vibration screening box 8 connected to the vibration motor 4.

[0027] A mill 6 and a material hopper 7 connected to the mill 6 are connected above the single-tube spiral guide channel 13, wherein the lower end discharge port of the material hopper 7 is connected to the feed port of the mill 6 through a retractable soft rubber tube. The mill 6 is arranged on the control seat 1 through a plurality of vertical support rods 5 and is electrically connected to the control unit.

[0028] The vibration screening box 8 comprises a vibration adjustment frame and a multi-layered spiral screening assembly.

[0029] like Figure 4 , Figure 5As shown, the vibration adjustment frame includes a vibration tray 9, a screw rod 11, a center column 10 and a fixing ring 12. The bottom of the vibration tray 9 is connected to the vibration motor 4. An upwardly extending center column 10 is arranged at the center of the vibration tray 9, and at least three upwardly extending screw rods 11 are evenly arranged along the circumference with the center column 10 as the center. The fixing ring 12 is passed through and fixed to the top of the screw rod 11.

[0030] The multi-layered spiral screening assembly includes a single-tube spiral guide channel 13 and a multi-layered spiral screening ring 14 which are connected from top to bottom. The single-tube spiral guide channel 13 is spirally arranged in the annular space between the fixed ring 12 and the central column 10 and is fixedly connected to the top of the central column 10. The multi-layered spiral screening ring 14 is spirally connected to the central column 10 through the inner side and is connected to the screw 11 in an outer side which can be adjusted up and down.

[0031] The feed port of the single-tube spiral guide channel 13 is connected to the discharge port of the grinding machine 6 through a retractable soft rubber tube to facilitate buffering and adaptation to deformation during vibration.

[0032] The multi-layered spiral screening ring 14 is provided with at least three layers of screening channels with the diameters of the screen holes decreasing from top to bottom. An adjustable-length telescopic sleeve 16 is provided between adjacent multi-layered spiral screening rings 14 on the same screw 11, and an adjusting spring 15 is provided between adjacent screening channels.

[0033] In this embodiment, if Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, at the discharge port of the multi-layered spiral screening ring 14 , the screening channels extend in a step-like decreasing manner, and each screening channel is connected to a recovery conduit 18 .

[0034] like Figure 3 As shown, the vibration screening box 8 also includes a box shell mounted on the vibration adjustment frame, and the lower part of the box shell and the vibration tray together form a bottom storage cavity 19; the outer side of the screening channel and the inner side of the box shell are squeezed and sealed by a sealing strip, and the discharge port of the recovery conduit 18 is arranged through the side wall of the box shell.

[0035] like Figure 4 As shown, a support block 17 is provided on the upper side wall of the central column 10 , and the support block 17 is supported on the lower outer side of the discharge port of the single-tube spiral guide channel 13 , and is fixedly connected to the side end face of the feed port of the multi-layered spiral screening ring 14 .

[0036] In this embodiment, the inner side of the spiral of the multi-layered spiral screening ring 14 is connected to the side of the central column 10 via a plastic elastic strip.

[0037] The cross section of the screening channel of the multi-layered spiral screening ring 14 is semicircular or arc-shaped.

[0038] like Figure 6 As shown, the embodiment of the present invention also provides a screening optimization method of the above spiral adjustable vibrating screening instrument, comprising the following steps: According to the predetermined screening efficiency standard rule, the length of the telescopic sleeve 16 between the adjacent multi-layered spiral screening rings 14 on the same screw 11 is set in advance, so as to achieve the sliding slope value of the adjustment channel; Select a number of soil samples to be screened, and put them into the grinding machine 6 through the material hopper 7. The control unit of the control base 1 controls the grinding machine 6 to grind and crush. Vibration parameters (frequency and amplitude) are input through the external physical control buttons and the touch screen 3, and the control unit controls the vibration motor 4 to start and drive the vibration tray 9 to perform vibration screening; After grinding, the soil sample flows downward through the single-tube spiral guide channel 13 and falls into the uppermost screening channel with a larger diameter of the multi-layered spiral screening ring 14, and the vibration parameters are adjusted according to the sliding slope, vibration parameters, and screening aperture constrained by the predetermined screening efficiency standard rules, and the screening efficiency is monitored in real time, so that the soil is gradually screened downward along the spiral channel; After screening through the channel, at the discharge port of the multi-layered spiral screening ring 14, the recovery duct 18 extending in a step-like decreasing manner through the screening channel is led out for classification and collection, and the soil screened through the bottom screening channel falls into the storage cavity 19 below which is surrounded by the lower part of the box shell and the vibration tray.

[0039] In this embodiment, the method steps for parameter constraint and real-time adjustment according to the predetermined screening efficiency standard rule are as follows: Determine the particle size range and average particle size of the soil sample to be tested, and select multiple screening channels and their different sieve hole diameters that can allow the soil of the particle size to be tested to pass through according to the average particle size of the soil sample; Based on the screening efficiency parameter relationship determined by the experiment, the appropriate sieve hole distribution density is selected, and the length of the adjusting spring 15 and / or the telescopic sleeve 16 between each layer of the spiral channel is adjusted to change the channel slope and the initial setting of the vibration frequency and amplitude to achieve a balance between the soil particle screening speed and the screening accuracy; The soil particle screening efficiency is monitored in real time, and according to the relationship between the monitoring result and the screening efficiency parameter, the vibration parameters of the vibration motor 4 are adjusted by controlling the physical buttons and the touch screen 3 of the control unit to optimize the screening efficiency: In the same test process, if the actual screening efficiency is lower than the predetermined screening target, increase the amplitude or increase the vibration frequency; if the screening efficiency is too high, reduce the amplitude or reduce the vibration frequency; Record the channel slope and sieve hole parameters in each screening process. Adjust the screening effect under different vibration parameters and select the optimal channel slope, vibration parameters and sieve hole parameter relationship corresponding to different soil particles.

[0040] It should be noted that the above screening efficiency parameter relationships and strategies are only adopted and exemplified in this embodiment. In addition, other feasible parameter relationship models can be set according to actual screening optimization conditions and requirements, so that the screening instrument in this application can obtain a wider application prospect.

[0041] In this embodiment, the vibration parameters , The relationship with screening efficiency is linear, and the channel slope α The relationship with screening efficiency is exponential, and the particle size The relationship with screening efficiency is inversely proportional to the mesh density. D、 density The relationship with screening efficiency is linear.

[0042] In this embodiment, considering the vibration parameters The linear relationship with the screening efficiency and the weight relationship of the parameters in the entire evaluation system are given as weight factors , the formula is: V= .

[0043] Influence function of channel slope f ( α ) using an exponential function: , and considering the influence of the number of screening channels from top to bottom m and the weight factor , the final impact formula is: .

[0044] The influence function of the distribution density and diameter of the sieve holes mainly considers the influence of density, diameter and number of channel layers. Among them, it is found through experiments that the difference between the diameters of different channel layers reflects the range and efficiency of soil particle size screening from top to bottom, so the influence function is: hD ( D )= .

[0045] Normalization constant N Determine through experimental data or theoretical analysis the value that reflects the maximum possible contribution of all the above influencing factors under ideal conditions. For example, the screening efficiency under optimal conditions can be measured experimentally, and then set N Make K The value of is 1. In this embodiment, adjust NThe value is adapted to different operating conditions and equipment configurations, and is verified and adjusted through experimental data. K The validity of the formula ensures that it can accurately reflect the screening efficiency.

[0046] In summary, the relationship between screening efficiency parameters is expressed as follows: ; Where K is the screening efficiency evaluation index; N is the normalization constant, which is used to adjust the K value range according to different soils; , , They are the efficiency evaluation influencing weight factors of vibration parameters, channel slope, and screening aperture; , are the amplitude and frequency of the vibration parameters respectively; is the channel slope α evaluation impact index function, is the expansion coefficient; D is the sieve hole diameter of the screening channel; m is the number of screening channel layers; is the experimental average diameter of the particles after grinding the soil sample to be screened; is the sieve hole distribution density of the screening channel.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A spiral adjustable vibrating screening instrument, comprising a control seat, the control seat is equipped with a control unit with a plurality of external physical control buttons and a touch screen, a vibration motor electrically connected to the control unit, and a vibration screening box connected to the vibration motor, characterized in that: The vibration screening box includes a vibration adjustment frame and a multi-layered spiral screening assembly; The vibration adjustment frame includes a vibration tray, a screw, a center column and a fixing ring. The bottom of the vibration tray is connected to the vibration motor. The center of the vibration tray is provided with an upwardly extending center column and at least three upwardly extending screws are evenly arranged along the circumference with the center column as the center. The fixing ring is passed through and fixed to the top of the screw. The multi-layered spiral screening assembly comprises a single-tube spiral guide channel and a multi-layered spiral screening ring which are connected from top to bottom. The single-tube spiral guide channel is spirally arranged in the annular space between the fixed ring and the central column and is fixedly connected to the top of the central column. The multi-layered spiral screening ring is spirally shaped, the inner side of the channel is sleeved and connected to the central column, and the outer side of the channel can be adjusted up and down and connected to the screw. The multi-layered spiral screening ring is provided with at least three layers of screening channels with the diameters of the screen holes decreasing from top to bottom. An adjustable telescopic sleeve is provided between adjacent multi-layered spiral screening rings on the same screw, and an adjusting spring is provided between adjacent screening channels.

2. The spiral adjustable vibrating sieving device according to claim 1, characterized in that: At the discharge port of the multi-layered spiral screening ring, the screening channels extend in a step-like decreasing manner, and each of the screening channels is connected to a recovery conduit.

3. The spiral adjustable vibrating sieving device according to claim 2, characterized in that: The vibration screening box also includes a box shell mounted on the vibration adjustment frame, and the lower part of the box shell and the vibration tray together form a bottom storage cavity; the outer side of the screening channel and the inner side of the box shell are squeezed and sealed by a sealing strip, and the discharge port of the recovery duct passes through the side wall of the box shell.

4. The spiral adjustable vibrating sieving device according to claim 1, characterized in that: A support block is arranged on the upper side wall of the central column, the support block is supported on the lower outer side of the discharge port of the single-tube spiral guide channel, and is fixedly connected to the side end face of the feed port of the multi-layered spiral screening ring.

5. The spiral adjustable vibrating sieving device according to claim 2, characterized in that: The inner side of the spiral of the multi-layered spiral screening ring is connected to the side of the central column through a plastic elastic strip.

6. The spiral adjustable vibrating sieving device according to claim 1, characterized in that: The cross section of the screening channel of the multi-layered spiral screening ring is semicircular or arc-shaped.

7. The spiral adjustable vibrating sieving device according to claim 1, characterized in that: A grinding mill and a material hopper connected to the grinding mill are connected above the single-tube spiral guide channel. The grinding mill is arranged on the control seat through a plurality of vertical support rods and is electrically connected to the control unit.

8. A screening optimization method for a spiral adjustable vibrating screening instrument as claimed in any one of claims 1 to 7, characterized in that: The steps include: According to the predetermined screening efficiency standard rules, the length of the telescopic sleeve between adjacent multi-layer spiral screening rings on the same screw is set in advance, so as to achieve the sliding slope value of the adjustment channel; Select a certain amount of soil samples to be screened, put them into the grinding machine through the material hopper, and the control unit of the control seat controls the grinding machine to grind and crush; Vibration parameters (frequency and amplitude) are input through the external physical control buttons and touch screen, and the control unit controls the vibration motor to start and drive the vibration tray to perform vibration screening; After grinding, the soil sample flows downward through the single-tube spiral guide channel and falls into the uppermost screening channel with a larger diameter screen hole in the multi-layered spiral screening ring. The sliding slope, vibration parameters, and screening aperture constrained by the predetermined screening efficiency standard rules are adjusted according to the real-time monitoring of the screening efficiency, so that the soil is gradually screened downward along the spiral channel. After screening through the channel, at the discharge port of the multi-layered spiral screening ring, the recovery duct connected by the screening channel extending in a step-like decreasing manner is led out for classification and collection, and the soil screened through the bottom screening channel falls into the storage cavity below which is surrounded by the lower part of the box shell and the vibration tray.

9. The screening optimization method of the spiral adjustable vibrating screening instrument according to claim 8, characterized in that: The method steps for parameter constraint and real-time adjustment according to the predetermined screening efficiency standard rules are as follows: Determine the particle size range and average particle size of the soil sample to be tested, and select multiple screening channels and their different sieve hole diameters that can allow the soil of the particle size to be tested to pass through according to the average particle size of the soil sample; Based on the screening efficiency parameter relationship determined by the test, select the appropriate sieve hole distribution density, adjust the length of the adjusting spring and / or telescopic sleeve between each layer of spiral channel to change the channel slope and initially set the vibration frequency and amplitude to achieve a balance between soil particle screening speed and screening accuracy; Monitor the soil particle screening efficiency in real time, and adjust the vibration parameters of the vibration motor to optimize the screening efficiency by controlling the physical buttons and touch screen of the control unit according to the monitoring results and the relationship between the screening efficiency parameters: In the same test process, if the actual screening efficiency is lower than the predetermined screening target, increase the amplitude or increase the vibration frequency; if the screening efficiency is too high, reduce the amplitude or reduce the vibration frequency; Record the channel slope and sieve hole parameters in each screening process. Adjust the screening effect under different vibration parameters and select the optimal channel slope, vibration parameters and sieve hole parameter relationship corresponding to different soil particles.

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