Automatic electrostatic fine particle screening machine

Abstract

The invention provides an automatic electrostatic fine particle screening machine which is mainly applied to geotechnical tests, can efficiently screen out soil particles with the particle size being 0.075 mm or below, and greatly improves the efficiency of preparing mucky soil samples. The automatic screening machine mainly comprises a feeding port, a discharging port, a screen, a coarse particle outlet, a dust raising device, an air blower, a corona electrode and a dust collecting electrode. Firstly, a soil sample enters the equipment through the feeding port, fine particles in the soil sample are suspended through the dust raising device, and then the suspended fine particles are conveyed to the filter screen through the air blower. And then, the soil particles passing through the filter screen can obtain negative charges, and the soil particles with the negative charges can be gathered together under the action of the corona electrode. And finally, under the action of the dust collecting electrodes, the soil particles with negative charges can be attracted and deposited, and therefore efficient screening of the soil particles is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of indoor geotechnical tests, and particularly relates to an electrostatic fine particle automatic screening machine. Background Art

[0002] The screening test is one of the important contents in indoor geotechnical experimental techniques. Screening analysis is one of the oldest particle size analysis methods and also the most widely used particle size analysis method in experimental research and production practice. With the development of China's infrastructure construction, many soft soil areas have been correspondingly developed. In order to obtain the physical and mechanical indexes of soft soil, indoor tests of soft soil need to be carried out. Screening of soil particles is an essential step in preparing soft soil specimens. However, the current experimental equipment and methods for soil sample screening are still relatively backward. Usually, manual screening and vibrating screen machines are used for screening. These two screening methods have the disadvantages of low screening efficiency, cumbersome operation, and easy inhalation of dust by people. Therefore, in order to improve the screening efficiency, convenience, and safety of fine particles, it is necessary to adopt a suitable and reliable automatic screening machine for fine soil particles. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an automatic screening machine for fine soil particles, which solves the problems raised in the above background art by setting up a dust generator, a blower, a screen, a corona electrode, and a dust collecting electrode.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] An automatic screening machine for fine soil particles, including a feed inlet, a discharge outlet, a screen, and a coarse particle outlet. It is characterized in that it further includes a dust generator for suspending fine soil particles in the soil sample, a blower for sending the suspended fine soil particles to the screen, a corona electrode for making the soil particles that have passed through the screen obtain a negative charge, and a dust collecting electrode for aggregating the soil particles with a negative charge. The dust generator and the blower are arranged on one side, the corona electrode and the dust collecting electrode are arranged on the other side, and the screen is arranged in the middle, and each part forms an integral whole;

[0006] Preferably, the dust generator is composed of a rotating shaft and fan blades. The fan blades are connected to the shaft. There is a gap between every two adjacent fan blades, and each fan blade is distributed in a staggered manner, one up and one down, which can effectively lift and suspend the fine particles in the soil sample;

[0007] Preferably, the blower is arranged on one side of the dust generator. One side of the blower is connected to the dust generator, and the other side is communicated with the external environment. The whole is in the shape of a spiral fan blade, which can effectively send the suspended fine soil particles to the screen;

[0008] The sieve is arranged between the dust-raising device and the corona electrode. The aperture of the sieve holes is 0.075 mm. Fine soil particles with a particle size less than 0.075 mm pass through the sieve and enter the side of the corona electrode.

[0009] Preferably, the corona electrode is a cathode plate, which ionizes the nearby air, causing the fine soil particles that have passed through the sieve to acquire negative charges.

[0010] Preferably, the dust collection electrode is an anode plate, which causes the negatively charged soil particles to aggregate, realizing the collection of fine particles and enabling the fine soil particles to enter the discharge port. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention. Figure 2 It is an exploded view of the box body of the present invention.

[0012] In the figure: 1, feed inlet; 2, blower; 3, dust-raising device; 4, coarse particle outlet; 5, sieve; 6, discharge port; 7, dust collection electrode; 8, corona electrode; 9, motor. Detailed Embodiments

[0013] The present invention will be further described in detail below in conjunction with the embodiments and the drawings, but the embodiments of the present invention are not limited thereto.

[0014] Please refer to Figure 1 , Figure 2 , the present invention provides a technical solution:

[0015] A fine soil particle automatic screening machine includes a feed inlet 1, a discharge port 6, a sieve 5, and a coarse particle outlet 4. It is characterized in that it further includes a dust-raising device 3 for suspending fine soil particles in the soil sample, a blower 2 for sending the suspended fine soil particles to the sieve, a corona electrode 8 for causing the soil particles that have passed through the sieve 5 to acquire negative charges, and a dust collection electrode 7 for aggregating the negatively charged soil particles. The dust-raising device 3 and the blower 2 are arranged on one side, the corona electrode and the dust collection electrode are arranged on the other side, and the sieve is arranged in the middle, and each part forms an integral whole.

[0016] Put an appropriate amount of dry soil sample with a particle size less than 2 mm into the screening machine through the feed inlet 1, place a container containing a soil sample with a particle size less than 0.075 mm at the bottom of the discharge port 6, start the screening machine, and wait for 30 minutes.

[0017] Turn off the power of the screening machine, place a container for containing the coarse particle soil sample at the bottom of the coarse particle outlet 4, open the switch of the coarse particle outlet 4 to let the coarse particles fall into the container for containing the coarse particle soil sample, take away the soil sample in the container for containing the soil sample with a particle size less than 0.075 mm, and repeat the above steps to continue the screening.

[0018] The above is a preferred embodiment of the present invention. However, the embodiments of the present invention are not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. An electrostatic fine particle automatic screening machine, comprising a feed inlet, a discharge outlet, a screen, and a coarse particle outlet, characterized in that It also includes a dust-raising device for suspending fine soil particles in the soil sample, a blower for sending the suspended fine soil particles to the screen, a corona electrode for imparting a negative charge to the soil particles that have passed through the screen, and a dust collecting electrode for aggregating the negatively charged soil particles. The dust-raising device and the blower are arranged on one side, the corona electrode and the dust collecting electrode are arranged on the other side, and the screen is arranged in the middle, with each part forming an integral whole.

2. The screening machine according to claim 1, wherein The dust-raising device consists of a rotating shaft and fan blades. The fan blades are connected to the shaft, there is a gap between every two adjacent fan blades, and the fan blades are staggered up and down, which can effectively raise and suspend the fine particles in the soil sample.

3. The screening machine according to claim 1, characterized in that The blower is arranged on one side of the dust-raising device. One side of the blower is connected to the dust-raising device, and the other side is communicated with the external environment. The whole is in the shape of a spiral fan blade, which can effectively send the suspended fine soil particles to the screen.

4. The screening machine according to claim 1, characterized in that, The screen is arranged between the dust-raising device and the corona electrode. The aperture of the screen holes is 0.075 mm, and the fine soil particles with a particle size less than 0.075 mm pass through the screen and enter the side of the corona electrode.

5. The screening machine according to claim 1, characterized in that, The corona electrode is a cathode plate, which ionizes the nearby air and imparts a negative charge to the fine soil particles that have passed through the screen.

6. The screening machine according to claim 1, wherein The dust collecting electrode is an anode plate, which aggregates the negatively charged soil particles, realizes the collection of fine particles, and enables the fine soil particles to enter the discharge port.

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