Screening equipment for soil component detection

Abstract

The invention discloses screening equipment for soil component detection. The screening equipment is composed of a tank body, a cover body and a screening cage. The screening cage is accurately installed in the center of the bottom of the tank body, and an interlayer space is formed between the screening cage and the tank body. And a plurality of ultrasonic transducers are uniformly embedded into the peripheral wall of the tank body and extend into the interlayer. And the bottom side of the tank body is connected with a discharge pipe. A rotating shaft is vertically installed in the screening cage, and a plurality of layers of stirring paddles are fixed to the rotating shaft. The bottom end of the rotating shaft penetrates through the bottom of the tank body and is connected with a motor. And a gas distribution ring is arranged at the lower end of the rotating shaft close to the bottom of the tank body, and is connected with the rotary joint at the top end through a gas channel in the rotating shaft. A plurality of spray pipes are dispersedly arranged in an area corresponding to the screening cage and are connected with a distribution pipe on the upper side of the cover body. The device provided by the invention can efficiently treat a soil sample at one time, reduces the use of acidic substances, and ensures that impurities are not mixed into a final detection sample.

Description

Technical Field

[0001] The present invention relates to a screening device, and particularly to a screening device for soil component detection. Background Art

[0002] Before detecting soil, it is necessary to screen soil samples. This process not only involves removing particulate matters, but more importantly, removing components that do not belong to the soil itself, such as sand, branches, plastics, etc. (It should be noted that the fine mineral sand contained in the soil does not belong to this category and is a component of the soil).

[0003] Currently, the water washing method is one of the commonly used methods. Since the soil forms mud, sand, branches, plastics, etc. can be removed through multiple washings. However, this method has low efficiency, and during the washing process, a high-speed motor is usually used for stirring, which may cause some sand to be further broken into fine particles and be difficult to separate, thus affecting the detection results. In addition, the stirring intensity of the motor is limited. Therefore, during the subsequent acid addition treatment process, more acidic reducing agents still need to be consumed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a screening device for soil detection to solve the technical problems in the above background art.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A screening device for soil component detection includes a tank body, a cover body, and a screening cage; the screening cage is installed at the central position of the bottom of the tank body, and there is an interlayer space between the screening cage and the tank body; a plurality of ultrasonic transducers are evenly embedded in the peripheral wall of the tank body and extend into the interlayer; a discharge pipe is connected to the bottom side of the tank body; a rotating shaft is vertically installed inside the screening cage, and multiple layers of stirring paddles are installed on the rotating shaft; the bottom end of the rotating shaft passes through the bottom of the tank body and is connected to a motor; a gas distribution ring is arranged at a position close to the bottom of the tank body on the rotating shaft, and the gas distribution ring is connected to a rotary joint installed at the top end of the rotating shaft through an air duct inside the rotating shaft; the fixed part of the rotary joint is fixed on the upper side of the cover body through a support frame; on the lower side of the cover body, in the area corresponding to the screening cage, a plurality of spray pipes are dispersedly arranged, and these spray pipes are connected to the upper side of the cover body through a distribution pipe.

[0007] Further, the cage wall of the screening cage is made of metal foam ceramic material or nickel foam metal material, with a wall thickness of 4 - 5 mm, the type of foaming pores is through holes, and the pore diameter is 0.2 - 0.3 mm.

[0008] Further, the ends of the stirring paddles at different layers and in the same corresponding position are connected to the same vertical scraper, and the scraper is close to the cage wall.

[0009] Furthermore, the inner bottom wall of the screening cage is higher than the bottom wall of the interlayer.

[0010] Furthermore, the motor is fixed to the bottom of the tank body through a motor bracket, and a number of elastic brackets are also installed at the bottom of the tank body. The bottom of the elastic bracket is connected to the counterweight seat.

[0011] Furthermore, a flange is arranged inwardly on the top side of the inner wall of the tank body, and the flange and the top of the screening cage form a sealing structure.

[0012] The advantages of the present invention are as follows:

[0013] (1) The application of the present invention can efficiently process soil samples at one time, significantly shortening the time required for detection;

[0014] (2) Through the synergistic effect of ultrasonic oscillation and the compression and expansion of bubbles, the soil is highly liquefied to form extremely fine suspended particles. This process greatly promotes the subsequent acid etching and reduction steps, significantly reducing the amount of acid used for reduction, not only saving costs but also being more environmentally friendly.

[0015] (3) Although a stirrer is used in the present invention to achieve the mixing effect and the ultrasonic power is only for the purpose of liquefaction, impurities that cannot be liquefied such as stone sand and branches will not be mixed into the final detection sample. This ensures the accuracy of soil parameter detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0017] Figure 2 is a cross-sectional view of the present invention.

[0018] In the figure, 1 - tank body, 11 - discharge pipe, 12 - elastic bracket, 13 - counterweight seat, 14 - flange, 2 - screening cage, 21 - interlayer, 3 - rotating shaft, 31 - stirring paddle, 32 - scraper, 33 - gas distribution ring, 331 - air duct, 4 - rotary joint, 41 - support frame, 5 - cover body, 6 - spray pipe, 61 - distribution pipe, 7 - motor, 71 - motor support, 8 - ultrasonic transducer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further describes the specific embodiments of the present invention with reference to the drawings. It should be noted here that the description of these embodiments is for helping to understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the following various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0020] As shown in the figure:

[0021] A screening device for soil component detection, comprising a tank body 1, a cover body 5 and a screening cage; the screening cage is installed at the central position of the bottom of the tank body 1, and there is an interlayer 21 space between the screening cage 2 and the tank body 1; a plurality of ultrasonic transducers 8 are evenly embedded in the peripheral wall of the tank body 1, and these ultrasonic transducers penetrate into the interlayer 21; a discharge pipe 11 is connected to the bottom side of the tank body 1; a rotating shaft 3 is vertically installed inside the screening cage 2, and multiple stirring paddles 31 are installed on the rotating shaft 3; the bottom end of the rotating shaft 3 passes through the bottom of the tank body 1 and is connected to a motor 7; a gas distribution ring 33 is arranged at a position of the rotating shaft 3 close to the bottom of the tank body 1, and the gas distribution ring 33 is connected to a rotary joint 4 installed at the top end of the rotating shaft 3 through an air passage 331 inside the rotating shaft 3; the fixed part of the rotary joint 4 is fixed to the upper side of the cover body 5 through a support frame 41; on the lower side of the cover body 5, corresponding to the area of the screening cage 2, a plurality of spray pipes 6 are dispersedly arranged, and these spray pipes 6 are connected to the upper side of the cover body 5 through a distribution pipe 61.

[0022] When performing soil screening operations, first open the cover body 55, pour the soil sample into the screening cage 2, and then close the cover body 55. The cover body 55 can be screwed or fixed by other means (such as bolts or latches) to ensure that it will not separate from the tank body 1 during operation. During the closing process of the cover body 55, the top end of the rotating shaft 3 will pass through the cover body 55 and dock with the rotating part of the rotary joint 4. It is recommended to choose a rotary joint 4 with a quick-sealing joint to ensure the convenience and tightness of the connection.

[0023] After the cover body 5 is fixed and the top end of the rotating shaft 3 is docked with the rotary joint 4, next, connect the distribution pipe 6161 to the pressurized water supply pipe and connect the inlet of the rotary joint 4 to the compressed air pipe.

[0024] After completing these steps, start the motor to start stirring. The motor can be a stepper motor or a pulse motor to eliminate the gearbox and achieve stepless speed regulation. Control the speed at 60 - 100 r / min and supply water at the same time. Stop supplying water after the water submerges the soil by 2 - 3 cm, and then start the ultrasonic transducers and start supplying air.

[0025] In the subsequent process, the ultrasonic transducer will transmit high-frequency oscillations to the inside of the screening cage 2 through the water in the sandwich layer 21. Ultrasonic waves are elastic mechanical vibration waves, and the whole process of expansion and compression is formed when passing through the medium. In a liquid, the expansion process forms a negative pressure, resulting in the generation of bubbles or the tearing into tiny cavities in the liquid. When these cavities close instantaneously, an instantaneous pressure as high as 3000 MPa is generated, which is called cavitation. The whole process is completed within 400 μs, which can quickly liquefy the soil. Compressed air enters the air duct 331 through the rotary joint 4 and then discharges from the air distribution ring 33, and is dispersed as it rotates. The added air can amplify the compression and expansion process of the ultrasonic waves because the compression ratio of air is much larger than that of the liquid, making the compression and expansion processes more intense, thus promoting the rapid liquefaction of the soil.

[0026] After the liquefaction is completed, open the discharge pipe 11 (it is recommended to use a plunger instead of a valve to avoid clogging the valve with the liquefied mud), and stop the equipment operation until the discharged water is nearly clear.

[0027] As an optimized solution, the cage wall of the screening cage 2 can be made of metal foam ceramics or nickel foam metal, with a wall thickness of 4 - 5 mm, and the foaming pores are through holes with a pore diameter of 0.2 - 0.3 mm. Metal foam ceramics or nickel foam metal have strong physical corrosion resistance, can prevent ultrasonic corrosion, and have good filtering performance and stiffness, which are suitable as the cage body material.

[0028] To increase the speed of discharging the mud, the ends of the stirring paddles 31 at different layers and in the same corresponding position are connected to the same vertical scraper 32. The scraper 32 is close to the cage wall to prevent the pores of the cage wall from being blocked by larger particles. At the same time, the inner bottom wall of the screening cage 2 is higher than the bottom wall of the sandwich layer 21 to ensure that there is no liquid accumulation inside the cage during discharge.

[0029] The motor 7 can be fixed to the bottom of the tank body 1 through the motor bracket 71. Since the ultrasonic waves will generate high-frequency oscillations, several elastic brackets 12 should also be installed at the bottom of the tank body 1. The bottom of the elastic brackets 12 is connected to the counterweight seat 13 to reduce the vibration transmission to the tabletop or the operating platform.

[0030] As an improved solution, a flange 14 is provided inwardly on the top side of the inner wall of the tank body 1, and the flange 14 and the top of the screening cage 2 form a sealing structure to prevent the unfiltered liquefied soil inside from entering the sandwich layer 21.

[0031] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principles and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. A screening device for soil component detection, characterized in that: It includes a tank body, a cover body and a screening cage; the screening cage is installed at the central position of the bottom of the tank body, and there is an interlayer space between the screening cage and the tank body; a plurality of ultrasonic transducers are evenly embedded in the peripheral wall of the tank body, and these ultrasonic transducers extend into the interlayer; a discharge pipe is connected to the bottom side of the tank body; a rotating shaft is vertically installed inside the screening cage, and multiple stirring paddles are installed on the rotating shaft; the bottom end of the rotating shaft passes through the bottom of the tank body and is connected to the motor; an air distribution ring is arranged at a position of the rotating shaft close to the bottom of the tank body, and the air distribution ring is connected to a rotary joint installed at the top end of the rotating shaft through an air passage inside the rotating shaft; the fixed part of the rotary joint is fixed on the upper side of the cover body through a support frame; on the lower side of the cover body, in the area corresponding to the screening cage, a plurality of nozzles are dispersedly arranged, and these nozzles are connected to the upper side of the cover body through a distribution pipe.

2. The screening device for soil component detection according to claim 1, characterized in that: The cage wall of the screening cage is made of metal foamed ceramic material or nickel foam metal material, with a wall thickness of 4-5 mm, the type of foaming pores is through holes, and the pore diameter is 0.2-0.3 mm.

3. The screening device for soil component detection according to claim 1, characterized in that: The ends of the stirring paddles at different layers and in the same corresponding position are connected to the same vertical scraper, and the scraper is close to the cage wall.

4. The screening device for soil component detection according to claim 1, characterized in that: The inner bottom wall of the screening cage is higher than the bottom wall of the interlayer.

5. The screening device for soil component detection according to claim 1, characterized in that: The motor is fixed to the bottom of the tank body through a motor bracket, and a number of elastic brackets are also installed at the bottom of the tank body, and the bottom of the elastic bracket is connected to a counterweight seat.

6. The screening device for soil component detection according to any one of claims 1-5, characterized in that: A flange is arranged inwardly at the top side of the inner wall of the tank body, and the flange and the top of the screening cage form a sealing structure.

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