WO2022174837A1 - 错床复试筛分装置及土壤筛分方法 - Google Patents

错床复试筛分装置及土壤筛分方法 Download PDF

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Publication number
WO2022174837A1
WO2022174837A1 PCT/CN2022/077230 CN2022077230W WO2022174837A1 WO 2022174837 A1 WO2022174837 A1 WO 2022174837A1 CN 2022077230 W CN2022077230 W CN 2022077230W WO 2022174837 A1 WO2022174837 A1 WO 2022174837A1
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Prior art keywords
screen
bed
staggered
mesh
retest
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PCT/CN2022/077230
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English (en)
French (fr)
Inventor
张辰
谭学军
王磊
钱赵秋
朱煜
高耘飞
邱月峰
徐伟
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上海市政工程设计研究总院（集团）有限公司
上海申环环境工程有限公司
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Publication of WO2022174837A1 publication Critical patent/WO2022174837A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning

Definitions

  • the invention relates to the field of screening equipment, in particular to a staggered-bed retest screening device and a soil screening method.
  • Soil is usually composed of gravel, sand, silt, clay, and other impurities.
  • the components of the soil have the characteristics of wide particle size range and high viscosity.
  • the existing screening equipment is very prone to screen blockage in the actual operation process. The clogging of the screen not only reduces the screening efficiency, but also increases the workload of screen cleaning.
  • critical plugging the soil contains a large number of particles with a particle size close to the mesh diameter of the screen. During the screening process, such particles are stuck in the mesh, so that such particles cannot pass through the mesh smoothly.
  • viscous plugging the moisture content of soil particles is too high and the viscosity is too large. Cohesive clumps of soil adhere to the mesh, making it difficult to pass through the mesh.
  • the diameter of the steel wire of the woven screen is too thick, and there are many contact points between the soil and the screen holes, and the soil is easily blocked by the steel wire, so that the soil cannot pass through the mesh holes smoothly.
  • Mesh blockage caused by the second and third reasons above can be improved by reducing soil moisture content and reducing wire diameter.
  • conventional screening equipment generally uses a screen with a fixed mesh, which cannot effectively overcome the blocking of the screen hole by the critical material particles, resulting in a low efficiency of vibrating screening, even if the amplitude is increased. Effectively solve the problem of critical hole plugging, in addition, increasing the amplitude may shorten the service life of the screening equipment.
  • the technical problem to be solved by the present invention is to provide a staggered-bed retest screening device and a soil screening method in order to overcome the above-mentioned defect that the screen mesh of the screening device in the prior art is prone to critical hole blocking.
  • a staggered-bed retest screening device for soil screening characterized in that the staggered-bed retest screening device comprises a shell, a first screen, a first power part, a second screen, and a second power department;
  • the top of the shell is provided with a feeding port, the bottom of the shell is provided with a discharge port for under-sieves, and the side of the shell is provided with a discharge port for over-sieves;
  • the inside of the shell is arranged on the first screen and the second screen in sequence from top to bottom, and the oversize of the second screen leaves the shell through the oversize outlet
  • the mesh surface of the first screen mesh is parallel to the mesh surface of the second mesh mesh, and the angle between the mesh surface of the first mesh mesh and the horizontal plane ranges from 15° to 30°;
  • the first power part and the second power part act on the first screen and the second screen respectively, so that the first screen and the second screen have the same amplitude and The frequency reciprocates up and down, and the mesh surface of the second screen is parallel to the mesh surface of the first screen.
  • the first screen and the second screen are arranged in the casing in sequence from top to bottom, and the first and second power parts are used to drive the first screen and the second screen to make the same
  • the amplitude and frequency vibrate up and down so that the screen with a fixed two-dimensional aperture in the plane can be expanded into a screen with a three-dimensional variable aperture.
  • the continuous change of the screen aperture during the screening process is realized, thereby effectively eliminating the problem of critical hole blocking and significantly improving the the screening efficiency.
  • the inclinedly arranged first screen and second screen can also bounce or sieve the foreign matter stuck in the screen, and can also break the soil mass stuck in the screen hole, which can realize Self-cleaning effect.
  • the first screen, the second screen, the first power part and the second power part are relatively static in the vertical direction, and all are located on the vibration platform of the staggered-bed retest screening device.
  • the first power part and the second power part are both arranged on the vibration platform; the first power part is drivingly connected to the first screen, and the second power part is drivingly connected to the second screen.
  • the cross-section of the casing gradually decreases from the lower side of the second screen to the outlet for the undersize.
  • the first power part and the second power part are respectively a first vibration motor and a second vibration motor, and the amplitudes of the first vibration motor and the second vibration motor are both not less than 8 mm, And the vibration frequency is not less than 1000r/min.
  • the distance between the feed port and the first screen is not greater than 300mm.
  • the mesh aperture of the second screen is not larger than the mesh aperture of the first screen.
  • the mesh aperture of the first screen is 30mm.
  • the mesh aperture of the second screen is 15mm.
  • a soil screening method characterized in that the soil screening method uses the above-mentioned staggered-bed retest screening device;
  • the thickness of the soil on the first screen is not greater than 5 times the mesh aperture of the first screen; and/or,
  • the particle size of the soil at the outlet of the oversize material is not greater than 5 times the particle size of the soil at the outlet of the undersize material.
  • the first screen and the second screen are sequentially arranged in the casing from top to bottom, and the first power part and the second power part are used to drive the first screen and the second screen at the same amplitude and frequency.
  • Up and down reciprocating vibration so that the screen with a fixed two-dimensional aperture in the plane is expanded into a screen with a three-dimensional variable aperture.
  • the continuous change of the screen aperture during the screening process is realized, thereby effectively eliminating the problem of critical hole blocking and significantly improving the the screening efficiency.
  • the inclinedly arranged first screen and second screen can also bounce or sieve the foreign matter stuck in the screen, and can also break the soil mass stuck in the screen hole, which can realize Self-cleaning effect.
  • FIG. 1 is a schematic structural diagram of a staggered-bed retest screening device according to a preferred embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of the vibration platform of the staggered-bed retest screening device in FIG. 1 .
  • the second power unit 15 The second power unit 15
  • the present embodiment is a staggered-bed retest screening device 100 for soil screening.
  • the staggered-bed retest screening device 100 includes a shell 11 , a first screen 12 , a first The power part 13 , the second screen 14 , and the second power part 15 ; the top of the casing 11 is provided with a feeding port 111 , the bottom of the casing 11 is provided with a sieve discharge port 112 , and the side of the casing 11 is provided with a feeding port 111 .
  • the oversize discharge port 113 the interior of the housing 11 is arranged on the first screen 12 and the second screen 14 in order from top to bottom, and the oversize of the second screen 14 leaves the screen through the oversize discharge port 113 Housing 11;
  • the mesh surface of the first screen 12 is parallel to the mesh surface of the second screen 14, and the angle between the mesh surface of the first screen 12 and the horizontal plane ranges from 15° to 30°;
  • the first power unit 13 and the second power part 15 act on the first screen 12 and the second screen 14 respectively, so that the first screen 12 and the second screen 14 reciprocate up and down with the same amplitude and frequency, and the second screen 14
  • the mesh surface of 1 is parallel to the mesh surface of the first screen mesh 12 .
  • the first screen 12 and the second screen 14 are sequentially arranged in the casing 11 from top to bottom, and the first screen 12 and the second screen 14 are driven by the first power part 13 and the second power part 15 It vibrates up and down with the same amplitude and frequency, so that the screen with a fixed two-dimensional aperture in the plane is expanded into a screen with a three-dimensional variable aperture.
  • the continuous change of the screen aperture during the screening process is realized, thereby effectively eliminating the problem of critical hole blocking, significantly to improve the screening efficiency.
  • the inclinedly arranged first screen 12 and second screen 14 can also bounce or sieve the foreign matter stuck in the screen, and can also break the soil mass stuck in the screen hole, Able to achieve self-cleaning effect.
  • the first screen 12 , the second screen 14 , the first power part 13 and the second power part 15 are relatively static in the vertical direction, and all are located on the vibration platform 20 of the staggered-bed retest screening device 100 .
  • the first power part 13 and the second power part 15 are both arranged on the vibration platform 20, the first power part 13 is drivingly connected to the first screen 12, and the second power part 15 is drivingly connected to the second screen 14
  • the first screen 12 and the second screen 14 perform reciprocating and opposite parallel vibrations.
  • the first screen 12 moves to the left in the arrow direction
  • the second screen 14 moves to the right in the direction of the arrow.
  • the vibrating platform 20 in the figure is a frame structure, and the vibrating platform 20 is arranged on the first strengthening rod 21 and the second strengthening rod 22 from top to bottom.
  • the first power part 13 is provided on the first strong rod 21
  • the second power part 15 is provided on the second strong rod 22 .
  • the cross section of the casing 11 gradually decreases from the lower side of the second screen 14 to the undersize outlet 112 .
  • the first power part 13 and the second power part 15 are respectively a first vibration motor and a second vibration motor, the amplitudes of the first vibration motor and the second vibration motor are both not less than 8 mm, and the vibration frequencies are both Not less than 1000r/min.
  • the first power part 13 and the second power part 15 may also be other power components, such as a cylinder assembly, or a motor assembly combined with a transmission assembly, such as a motor assembly erecting a multi-link assembly or a cam assembly .
  • the distance between the feeding port 111 and the first screen 12 is not greater than 300mm. If the height is too high, it is easy to cause accumulation of soil, which is not conducive to soil screening. If the height is too low, it is easy to cause insufficient material supply, thereby causing the staggered bed retest screening device 100 to be unloaded.
  • the mesh aperture of the second screen 14 is not larger than the mesh aperture of the first screen 12 .
  • the mesh aperture of the first screen 12 can be determined according to the target particle size of the undersize, specifically, it can be equal to the target particle size of the undersize, or slightly larger than the target particle size of the undersize.
  • the mesh aperture of the first screen mesh 12 is 30 mm.
  • the mesh aperture of the second screen 14 is 15 mm.
  • This embodiment can also be a soil screening method, and the soil screening method uses the above-mentioned staggered-bed retest screening device 100; the thickness of the soil on the first screen 12 is not greater than 5 times; the particle size of the soil at the discharge port 113 of the oversize material can also be set to be no greater than 5 times the particle size of the soil at the discharge port 112 of the undersize material at the same time or separately.
  • the mesh aperture of the first screen 12 is 30 mm
  • the mesh aperture of the second screen 14 is 15 mm. Then, the thickness of the soil on the first screen 12 is not greater than 150 mm, and the particle size of the soil at the outlet 113 of the sieve is not greater than 75 mm.

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  • Combined Means For Separation Of Solids (AREA)

Abstract

一种错床复试筛分装置和土壤筛分方法，错床复试筛分装置包括壳体（11）、进料口（111）、筛下物出料口（112）及筛上物出料口（113）；壳体的内部自上向下依次设于第一筛网（12）及第二筛网（14）；第一筛网的网面平行于第二筛网的网面；第一动力部（13）及第二动力部（15）分别作用于第一筛网及第二筛网，以使第一筛网及第二筛网以相同的振幅和频率上下往复振动。该筛网在平行于网面的方向的往复相对运动，实现了筛网孔径在筛分过程中的不断变化，进而有效地消除了临界堵孔的问题，提高了筛分效率。

Description

错床复试筛分装置及土壤筛分方法
本申请要求申请日为2021年2月22日的中国专利申请2021101998388的优先权。本申请引用上述中国专利申请的全文。
技术领域
本发明涉及筛分设备领域，特别涉及一种错床复试筛分装置及土壤筛分方法。
背景技术
随着我国经济的发展以及产业结构的调整，中心城市大量工业企业搬迁转移，所遗留下的工业污染地块存在较大的环境和健康风险，针对污染地块进行修复及再利用成为城市发展中亟需面对的问题。
针对污染土壤进行化学氧化、热脱附、淋洗等异位修复时，通常需要先对土壤进行筛分预处理，以提高土壤的均质性，并防止石块、杂物等损坏后续处理设备。土壤通常由砾石、砂粒、粉土、粘土以及其他杂质等组成。土壤的组分具有粒径范围广、粘性大等特点，现有的筛分设备在实际运行过程中极易产生筛网堵塞现象。筛网堵塞既降低了筛分效率，又增加了筛网清理工作量。
土壤筛分过程中，筛网堵塞的原因主要有以下几个方面。
第一，临界堵孔：土壤中含有大量粒径接近筛网的网孔直径的颗粒，筛分过程中这类颗粒卡在网孔中，从而造成这类颗粒无法顺利通过网孔。第二，粘性堵孔：土壤颗粒含水率偏高，粘性过大。黏结成团土壤附着在网孔上，从而让难以通过网孔。第三，编织筛网的钢丝的直径过粗，土壤与筛孔的接触点较多，土壤易被钢丝阻挡，从而造成土壤无法顺利通过网孔。
上述第二种和第三种原因所造成的网孔堵塞可通过降低土壤含水率和 降低钢丝直径等途径得以改善。
对于第一中临界堵孔而言，常规筛分设备一般采用固定网孔的筛网，无法有效克服临界物料颗粒对筛孔的堵塞，从而造成振动筛分效率不高，即使加大振幅也不能有效解决临界堵孔问题，另外，加大振幅可能会缩短筛分设备的使用寿命。
发明内容
本发明要解决的技术问题是为了克服现有技术中筛分装置的筛网易发生临界堵孔的上述缺陷，提供一种错床复试筛分装置及土壤筛分方法。
本发明是通过下述技术方案来解决上述技术问题：
一种错床复试筛分装置，用于土壤的筛分，其特点在于，所述错床复试筛分装置包括壳体、第一筛网、第一动力部、第二筛网、第二动力部；
所述壳体的顶部设有进料口，所述壳体的底部设有筛下物出料口，所述壳体的侧面设有筛上物出料口；
所述壳体的内部自上向下依次设于所述第一筛网及所述第二筛网，所述第二筛网的筛上物经所述筛上物出料口离开所述壳体；所述第一筛网的网面平行于所述第二筛网的网面，所述第一筛网的网面与水平面的夹角的范围为15°-30°；
所述第一动力部及所述第二动力部分别作用于所述第一筛网及所述第二筛网，以使所述第一筛网及所述第二筛网以相同的振幅和频率上下往复振动，且所述第二筛网的网面平行于所述第一筛网的网面。
在本方案中，通过将第一筛网及第二筛网自上向下依次设于壳体内，并利用第一动力部和第二动力部驱动第一筛网和第二筛网以相同的振幅和频率上下往复振动，从而使得平面二维孔径固定的筛网扩展为立体三维可变孔径的筛网。利用第一筛网与第二筛网在平行于网面的方向的往复相对运动，实现了筛网孔径在筛分过程中的不断变化，进而有效地消除了临界堵孔的问 题，显著的提高了筛分效率。同时，倾斜设置的第一筛网与第二筛网还可以将卡塞于筛网中的异物弹起或使之过筛，也可以将卡塞于筛孔中的土壤团块破碎，能够实现自清理的效果。
较佳地，所述第一筛网、所述第二筛网、所述第一动力部及第二动力部在垂直方向上相对静止，且均位于所述错床复试筛分装置的振动平台，第一动力部及第二动力部均设置于所述振动平台；所述第一动力部驱动连接于所述第一筛网，所述第二动力部驱动连接于所述第二筛网。
较佳地，所述壳体的横截面自所述第二筛网的下侧面至所述筛下物出料口逐渐变小。
较佳地，所述第一动力部及所述第二动力部分别为第一振动电机及第二振动电机，所述第一振动电机及所述第二振动电机的振幅均不少于8mm，且振动频率均不少于1000r/min。
较佳地，所述进料口与所述第一筛网之间的距离不大于300mm。
较佳地，所述第二筛网的网孔孔径不大于所述第一筛网的网孔孔径。
较佳地，所述第一筛网的网孔孔径为30mm。
较佳地，所述第二筛网的网孔孔径为15mm。
一种土壤筛分方法，其特点在于，所述土壤筛分方法使用如上所述的错床复试筛分装置；
所述第一筛网上的土壤的厚度不大于所述第一筛网的网孔孔径的5倍；和/或，
所述筛上物出料口的土壤的粒径不大于所述筛下物出料口的土壤的粒径的5倍。
在本方法中，通过采用上述错床复试筛分装置，有效地解决了临界堵孔的问题，显著的提高了筛分效率。
在符合本领域常识的基础上，上述各优选条件，可任意组合，即得本发明各较佳实例。
本发明的积极进步效果在于：
本发明通过经第一筛网及第二筛网自上向下依次设于壳体内，并利用第一动力部和第二动力部驱动第一筛网和第二筛网以相同的振幅和频率上下往复振动，从而使得平面二维孔径固定的筛网扩展为立体三维可变孔径的筛网。利用第一筛网与第二筛网在平行于网面的方向的往复相对运动，实现了筛网孔径在筛分过程中的不断变化，进而有效地消除了临界堵孔的问题，显著的提高了筛分效率。同时，倾斜设置的第一筛网与第二筛网还可以将卡塞于筛网中的异物弹起或使之过筛，也可以将卡塞于筛孔中的土壤团块破碎，能够实现自清理的效果。
附图说明
图1为本发明较佳实施例的错床复试筛分装置的结构示意图。
图2为图1中错床复试筛分装置的振动平台的结构示意图。
附图标记说明：
错床复试筛分装置100
壳体11
进料口111
筛下物出料口112
筛上物出料口113
第一筛网12
第一动力部13
第二筛网14
第二动力部15
振动平台20
第一固强棒21
第二固强棒22
具体实施方式
下面通过实施例的方式并结合附图来更清楚完整地说明本发明，但并不因此将本发明限制在实施例的范围之中。
如图1及图2所示，本实施例为一种错床复试筛分装置100，用于土壤的筛分，错床复试筛分装置100包括壳体11、第一筛网12、第一动力部13、第二筛网14、第二动力部15；壳体11的顶部设有进料口111，壳体11的底部设有筛下物出料口112，壳体11的侧面设有筛上物出料口113；壳体11的内部自上向下依次设于第一筛网12及第二筛网14，第二筛网14的筛上物经筛上物出料口113离开壳体11；第一筛网12的网面平行于第二筛网14的网面，第一筛网12的网面与水平面的夹角的范围为15°-30°；第一动力部13及第二动力部15分别作用于第一筛网12及第二筛网14，以使第一筛网12及第二筛网14以相同的振幅和频率上下往复振动，且第二筛网14的网面平行于第一筛网12的网面。通过将第一筛网12及第二筛网14自上向下依次设于壳体11内，并利用第一动力部13和第二动力部15驱动第一筛网12和第二筛网14以相同的振幅和频率上下往复振动，从而使得平面二维孔径固定的筛网扩展为立体三维可变孔径的筛网。利用第一筛网12与第二筛网14在平行于网面的方向的往复相对运动，实现了筛网孔径在筛分过程中的不断变化，进而有效地消除了临界堵孔的问题，显著的提高了筛分效率。同时，倾斜设置的第一筛网12与第二筛网14还可以将卡塞于筛网中的异物弹起或使之过筛，也可以将卡塞于筛孔中的土壤团块破碎，能够实现自清理的效果。
作为一种实施方式，第一筛网12、第二筛网14、第一动力部13及第二动力部15在垂直方向上相对静止，且均位于错床复试筛分装置100的振动平台20，第一动力部13及第二动力部15均设于振动平台20，第一动力部 13驱动连接于第一筛网12，第二动力部15驱动连接于第二筛网14在图1中，第一筛网12与第二筛网14进行往复相对相反的平行振动，当第一筛网12沿箭头向左时，第二筛网14沿箭头方向向右。
在图2中，图中的振动平台20为框架结构，振动平台20自上向下设于第一固强棒21及第二固强棒22。第一动力部13设于第一固强棒21上，第二动力部15设于第二固强棒22上。
在图1中，壳体11的横截面自第二筛网14的下侧面至筛下物出料口112逐渐变小。
作为一种实施方式，第一动力部13及第二动力部15分别为第一振动电机及第二振动电机，第一振动电机及第二振动电机的振幅均不少于8mm，且振动频率均不少于1000r/min。在其他实施例中，第一动力部13及第二动力部15也可以为其他动力部件，比如气缸组件，也可以为电机组件与传动组件相结合，比如电机组件架设多连杆组件或者凸轮组件。
为了提高筛分效率，进料口111与第一筛网12之间的距离不大于300mm。如果该高度过高，则易造成土壤的堆积，从而不利于土壤的筛分。如果高度过低，则易造成供料不足，从而造成错床复试筛分装置100空载。
作为一种实施方式，第二筛网14的网孔孔径不大于第一筛网12的网孔孔径。第一筛网12的网孔孔径可以根据筛下物目标粒径确定，具体地，可以等于筛下物目标粒径，也可以稍大于筛下物目标粒径。
作为一种具体的实施方式，第一筛网12的网孔孔径为30mm。第二筛网14的网孔孔径为15mm。
本实施例还可以为一种土壤筛分方法，土壤筛分方法使用如上的错床复试筛分装置100；第一筛网12上的土壤的厚度不大于第一筛网12的网孔孔径的5倍；也可以同时或单独将筛上物出料口113的土壤的粒径设定为不大于筛下物出料口112的土壤的粒径的5倍。通过采用上述错床复试筛分装置100，有效地解决了临界堵孔的问题，显著的提高了筛分效率。
如果第一筛网12的网孔孔径为30mm，第二筛网14的网孔孔径为15mm。那么，第一筛网12上的土壤的厚度不大于150mm，筛上物出料口113的土壤的粒径不大于75mm。
虽然以上描述了本发明的具体实施方式，但是本领域的技术人员应当理解，这仅是举例说明，本发明的保护范围是由所附权利要求书限定的。本领域的技术人员在不背离本发明的原理和实质的前提下，可以对这些实施方式做出多种变更或修改，但这些变更和修改均落入本发明的保护范围。
虽然以上描述了本发明的具体实施方式，但是本领域的技术人员应当理解，这些仅是举例说明，在不背离本发明的原理和实质的前提下，可以对这些实施方式做出多种变更或修改。因此，本发明的保护范围由所附权利要求书限定。

Claims (9)

  1. 一种错床复试筛分装置，用于土壤的筛分，其特征在于，所述错床复试筛分装置包括壳体、第一筛网、第一动力部、第二筛网、第二动力部；
    所述壳体的顶部设有进料口，所述壳体的底部设有筛下物出料口，所述壳体的侧面设有筛上物出料口；
    所述壳体的内部自上向下依次设于所述第一筛网及所述第二筛网，所述第二筛网的筛上物经所述筛上物出料口离开所述壳体；所述第一筛网的网面平行于所述第二筛网的网面，所述第一筛网的网面与水平面的夹角的范围为15°-30°；
    所述第一动力部及所述第二动力部分别作用于所述第一筛网及所述第二筛网，以使所述第一筛网及所述第二筛网以相同的振幅和频率上下往复振动，且所述第二筛网的网面平行于所述第一筛网的网面。
  2. 如权利要求1所述的错床复试筛分装置，其特征在于，所述第一筛网、所述第二筛网、所述第一动力部及第二动力部在垂直方向上相对静止，且均位于所述错床复试筛分装置的振动平台，第一动力部及第二动力部均设置于所述振动平台所述第一动力部驱动连接于所述第一筛网，所述第二动力部驱动连接于所述第二筛网。
  3. 如权利要求1或2所述的错床复试筛分装置，其特征在于，所述壳体的横截面自所述第二筛网的下侧面至所述筛下物出料口逐渐变小。
  4. 如权利要求1-3中至少一项所述的错床复试筛分装置，其特征在于，所述第一动力部及所述第二动力部分别为第一振动电机及第二振动电机，所述第一振动电机及所述第二振动电机的振幅均不少于8mm，且振动频率均不少于1000r/min。
  5. 如权利要求1-4中至少一项所述的错床复试筛分装置，其特征在于，所述进料口与所述第一筛网之间的距离不大于300mm。
  6. 如权利要求1-5中至少一项所述的错床复试筛分装置，其特征在于，所述第二筛网的网孔孔径不大于所述第一筛网的网孔孔径。
  7. 如权利要求1-6中至少一项所述的错床复试筛分装置，其特征在于，所述第一筛网的网孔孔径为30mm。
  8. 如权利要求1-7中至少一项所述的错床复试筛分装置，其特征在于，所述第二筛网的网孔孔径为15mm。
  9. 一种土壤筛分方法，其特征在于，所述土壤筛分方法使用如权利要求1-8中任意一项所述的错床复试筛分装置；和/或，
    所述第一筛网上的土壤的厚度不大于所述第一筛网的网孔孔径的5倍；
    所述筛上物出料口的土壤的粒径不大于所述筛下物出料口的土壤的粒径的5倍。
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