A coal flotation defoaming device

Abstract

The utility model discloses a kind of coal flotation froth removal devices, belong to coal dressing technical field;Including portal support, ultrasonic transducer, ultrasonic generator, liquid level meter, controller;Portal support is installed at the pool mouth of concentrate pool ontology, ultrasonic transducer is vertically suspended below the crossbeam of portal support by suspension mechanism, and ultrasonic transducer and ultrasonic generator are connected by cable;Liquid level meter is installed in concentrate pool ontology, and the output control end of controller is electrically connected with the start-stop control end of ultrasonic generator according to received liquid level signal;The utility model solves the problem that ultrasonic defoaming exists in the field of coal flotation, the sound field is not comprehensive, and the problem that running condition is unstable, poor adaptability.

Description

Technical Field

[0001] This utility model relates to the field of coal beneficiation technology, specifically to a flotation coal beneficiation defoaming device. Background Technology

[0002] Flotation is a crucial step in coal separation, utilizing differences in mineral surface properties to separate target minerals by having air bubbles carry them to the surface. As a gas-liquid-solid three-phase mixture, flotation concentrate often accumulates a large amount of stable foam after entering the concentrate pool due to the effects of residual frothers and shearing during flow. If this foam is not eliminated promptly, it will lead to problems such as concentrate pool overflow, cavitation in the pumping system, and reduced efficiency of subsequent dewatering equipment, severely impacting production continuity and economic efficiency.

[0003] Currently, there are three main defoaming methods: mechanical stirring defoaming suffers from high energy consumption, severe wear, and incomplete defoaming; chemical defoaming agents are effective, but residual agents affect the stability of the flotation process and may cause environmental pollution; and water spray defoaming requires a large amount of water and is prone to overflowing. These traditional methods all have obvious limitations.

[0004] Ultrasonic defoaming, as an emerging technology, breaks down foam through cavitation and sound pressure, offering advantages such as non-contact operation, high efficiency, and no pollution. However, its application in coal flotation is still immature, and existing devices have shortcomings in installation methods, sound field coverage, and adaptability to operating conditions. Therefore, developing a structurally sound, adaptable, and highly efficient ultrasonic defoaming device is of great significance. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and proposes a flotation coal preparation defoaming device to solve the problems of incomplete sound field coverage, unstable operating conditions, and poor adaptability of ultrasonic defoaming in the field of flotation coal preparation.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: A flotation coal preparation defoaming device includes a gantry frame, an ultrasonic transducer, an ultrasonic generator, a level gauge, and a controller. The gantry frame is installed at the mouth of the concentrate pool, with its crossbeam located above the mouth. The ultrasonic transducer is vertically suspended below the crossbeam of the gantry frame via a suspension mechanism used to adjust the height of the ultrasonic transducer. The ultrasonic transducer and the ultrasonic generator are connected by a cable. The level gauge is installed inside the concentrate pool, and the controller's output control terminal is electrically connected to the start / stop control terminal of the ultrasonic generator based on the received level signal.

[0007] Furthermore, the ultrasonic transducer includes a cover, a piezoelectric ceramic, a body, and an amplitude transformer; the piezoelectric ceramic is provided with a cover at its upper end and a body at its lower end, and the piezoelectric ceramic is sealed and compressed by the body and the cover; the lower end of the body is connected to the amplitude transformer.

[0008] Furthermore, the upper end of the cover is connected to an electrical connection point for introducing high-frequency electrical signals via the housing, and the electrical connection point is electrically connected to the piezoelectric ceramic.

[0009] Furthermore, there is a gap between the cover and the piezoelectric ceramic and a cooling channel is provided. The housing is provided with a cooling interface and a cooling outlet is provided at the end of the cooling channel.

[0010] Furthermore, a protective coating is provided on the outer surface of the ultrasonic transducer.

[0011] Furthermore, the ultrasonic generator includes a chassis, inside which a circuit board is installed; the circuit board integrates a high-frequency inductor and a high-frequency transformer.

[0012] Furthermore, heat sinks are installed on the heat-generating components of the circuit board, and a cooling fan is installed at the rear of the chassis.

[0013] Furthermore, the suspension mechanism includes a motor and a threaded rod, with the motor connected to the ultrasonic transducer via the threaded rod connected to the drive end.

[0014] Furthermore, a track is installed on the crossbeam of the portal frame, and an electric push rod is installed at one end of the crossbeam. The ultrasonic transducer is slidably connected to the track through the frame, and the telescopic end of the electric push rod is connected to the frame.

[0015] Furthermore, the ultrasonic generator is fixedly installed on the column of the gantry bracket.

[0016] The beneficial effects of this utility model compared to the prior art are as follows: 1. This utility model adopts ultrasonic defoaming technology, which uses the cavitation effect and sound pressure generated by high-frequency ultrasonic waves to directly break up foam, achieving completely non-contact defoaming. It not only has high defoaming efficiency, but also fundamentally solves the wear problem of traditional mechanical defoaming devices and the interference of chemical defoaming agents on the flotation process.

[0017] 2. This utility model uses a top-suspended installation method with a portal frame and an adjustable suspension mechanism to ensure that the ultrasonic transducer is vertically aligned with the foam accumulation area and that the working height can be precisely adjusted. This ensures that the sound field fully covers the foam layer and that the equipment operates stably above the concentrate pool.

[0018] 3. This utility model integrates a level gauge and a controller to construct a closed-loop automatic control system, which can automatically start and stop the defoaming operation according to the actual liquid level of the concentrate pool, significantly reducing equipment energy consumption and operating costs, while avoiding idling wear of the equipment. Attached Figure Description

[0019] Figure 1 This is an overall schematic diagram of the flotation coal preparation defoaming device described in this utility model; Figure 2 This is an exploded view of the ultrasonic transducer in this invention. Figure 3 This is an exploded view of the ultrasonic generator in this invention. The labels shown in the attached diagram: 1. Concentrate pool body; 2. Gantry support; 3. Ultrasonic transducer; 4. Ultrasonic generator; 5. Level gauge; 6. Controller; 301. Electrical connection; 302. Cover; 303. Piezoelectric ceramic; 304. Body; 305. Amplifier; 306. Cooling channel; 307. Shell; 401. Cooling fan; 402. Heat sink; 403. Circuit board; 404. High-frequency inductor; 405. High-frequency transformer. Detailed Implementation

[0020] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0021] See Figures 1 to 3 This embodiment proposes a flotation coal preparation defoaming device, which is installed as a whole at the mouth of the concentrate pool body 1. The flotation coal preparation defoaming device includes a gantry support 2, an ultrasonic transducer 3, an ultrasonic generator 4, a level gauge 5, and a controller 6.

[0022] Combination Figure 1 As shown, the portal frame 2 serves as the core load-bearing structure, with both ends securely fixed horizontally to the edge of the pool opening via anchor bolts. The ultrasonic transducer 3 is vertically suspended directly below the crossbeam of the portal frame 2 via an adjustable suspension mechanism. By adjusting the suspension mechanism, the vertical distance between the sound wave radiating end of the ultrasonic transducer 3 and the liquid surface of the foam accumulation area in the pool can be controlled. This distance is set to no more than 20 centimeters to optimize sound energy transmission efficiency. In this embodiment, the suspension mechanism is a motor, which is connected to the ultrasonic transducer 3 via a threaded rod connected to the drive end. After starting the motor, the position of the ultrasonic transducer 3 can be adjusted up and down via the threaded rod.

[0023] The ultrasonic generator 4 is wall-mounted on the outside of the column of the gantry bracket 2, with its installation height higher than the operating plane of the pool opening to avoid splashing. A high-frequency coaxial cable is laid along the crossbeams and outside the columns of the gantry bracket 2, protected and fixed by a protective groove. The high-frequency coaxial cable connects the ultrasonic transducer 3 and the ultrasonic generator 4, thereby transmitting the electrical energy of the ultrasonic generator 4 to the ultrasonic transducer 3. A level gauge 5 is installed at the bottom of the concentrate pool body 1 to monitor the slurry level in real time and transmits the level data to the controller 6 via a signal line. The controller 6, based on the received level signal, electrically connects its output control terminal to the start / stop control terminal of the ultrasonic generator 4, thus forming a complete monitoring and execution closed-loop system.

[0024] Combination Figure 2 As shown, the ultrasonic transducer 3 is installed and connected using a compact, layered stacking structure. The ultrasonic transducer 3 includes a cover 302, a piezoelectric ceramic 303, a body 304, and an amplitude transformer 305. The core functional component of the ultrasonic transducer 3 is the piezoelectric ceramic 303. The cover 302 is located on the upper end of the piezoelectric ceramic 303, and the body 304 is located on the lower end. The upper end of the body 304 seals and compresses the piezoelectric ceramic 303 through the cover 302. The upper end of the cover 302 is also connected to an electrical connection 301 for introducing high-frequency electrical signals via a housing 307. The electrical connection 301 is electrically connected to the piezoelectric ceramic 303. The lower end of the body 304 is firmly connected to the amplitude transformer 305. The function of the amplitude transformer 305 is to amplify and focus the mechanical vibrations generated by the piezoelectric ceramic 303, ultimately radiating ultrasonic waves outward from its bottom surface (i.e., the sound wave radiating end). To ensure durability under harsh conditions, the entire outer surface of the acoustic radiating end is covered with a corrosion-resistant and wear-resistant protective coating, such as an organic polymer coating, a ceramic coating, or a cermet coating.

[0025] To enable the ultrasonic transducer 3 to adapt to the temperature environment of coal flotation, a cooling structure is provided inside the ultrasonic transducer 3. Specifically, a gap exists between the cover 302 and the piezoelectric ceramic 303, and a cooling channel 306 is provided. A cooling interface is provided on the housing 307, and a cooling outlet is provided at the end of the cooling channel 306. The cooling method is air cooling. Cooling air passes through the cooling channel 306 to cool the inside of the piezoelectric ceramic 303, further improving the durability of the ultrasonic transducer 3 under coal flotation conditions.

[0026] Combination Figure 3As shown, the internal components of the ultrasonic generator 4 are arranged according to functional zones within the chassis. Its core control and power output functions are handled by the circuit board 403, which integrates power components such as a high-frequency inductor 404 and a high-frequency transformer 405. The ultrasonic generator 4 is configured to drive the ultrasonic transducer 3 to generate high-intensity ultrasonic waves with frequencies of 24kHz and above. To dissipate the large amount of heat generated during operation, heat sinks 402 are installed on the key heat-generating components of the circuit board 403, and forced convection is achieved through a cooling fan 401 installed at the rear of the chassis to expel the heat outside. All these internal components are securely fixed by brackets and rails within the chassis and electrically connected to external high-frequency coaxial cables and controller control cables via wiring ports on the chassis, forming a complete power conversion and drive unit.

[0027] For a relatively long concentrate pool body 1, a track can be set on the crossbeam of the portal frame 2, and an electric push rod can be installed. The ultrasonic transducer 3 is slidably connected to the track through the support. The telescopic end of the electric push rod is connected to the support. The position of the ultrasonic transducer 3 can be adjusted by the electric push rod so that the ultrasonic transducer 3 can perform defoaming at different positions above the concentrate pool body 1.

[0028] The working principle of this utility model is as follows: During system operation, the level gauge 5 installed at the bottom of the concentrate pool continuously monitors the slurry level and transmits the signal to the controller 6 in real time. When the level rises to the preset defoaming start threshold, the controller 6 automatically sends a start command to the ultrasonic generator 4. The ultrasonic generator 4 then operates, outputting a high-frequency electrical signal to drive the ultrasonic transducer 3 to generate ultrasonic waves with a frequency of 24kHz or higher. The piezoelectric ceramic 303 inside the transducer generates mechanical vibration under the excitation of the high-frequency electrical signal, which is amplified by the amplitude transformer 305 and emitted into the foam accumulation area. During this process, by adjusting the suspension mechanism, the distance between the sound wave radiating end and the foam liquid surface is kept to a short distance of no more than 20 cm, allowing the sound energy to be concentrated efficiently, inducing a strong cavitation effect and sound pressure effect in the foam layer, effectively destroying the liquid film structure of the foam and causing it to rupture rapidly, thereby achieving efficient defoaming. When the level drops to the preset stop threshold due to defoaming, the controller 6 automatically shuts down the ultrasonic generator 4, and the system enters standby mode. This cycle repeats to achieve automated, high-efficiency, non-contact defoaming operation.

[0029] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all such deductions or substitutions should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A flotation coal preparation defoaming device, characterized in that, Includes a portal frame (2), an ultrasonic transducer (3), an ultrasonic generator (4), a level gauge (5), and a controller (6); the portal frame (2) is installed at the mouth of the concentrate pool body (1), and the crossbeam of the portal frame (2) is located above the mouth of the pool; the ultrasonic transducer (3) is vertically suspended below the crossbeam of the portal frame (2) by a suspension mechanism, which is used to adjust the height of the ultrasonic transducer (3); the ultrasonic transducer (3) and the ultrasonic generator (4) are connected by a cable; the level gauge (5) is installed inside the concentrate pool body (1), and the controller (6) is electrically connected to the start / stop control terminal of the ultrasonic generator (4) according to the received level signal. The ultrasonic transducer (3) includes a cover (302), a piezoelectric ceramic (303), a body (304), and an amplitude transformer (305). The piezoelectric ceramic (303) is provided with a cover (302) at its upper end and a body (304) at its lower end. The piezoelectric ceramic (303) is sealed and compressed by the body (304) and the cover (302). The lower end of the body (304) is connected to the amplitude transformer (305). The upper end of the cover (302) is also connected to an electrical connection (301) for introducing high-frequency electrical signals through a housing (307). The electrical connection (301) is electrically connected to the piezoelectric ceramic (303). There is a gap between the cover (302) and the piezoelectric ceramic (303) and a cooling channel (306) is provided. A cooling interface is provided on the housing (307), and a cooling outlet is provided at the end of the cooling channel (306).

2. The flotation coal preparation defoaming device according to claim 1, characterized in that, The outer surface of the ultrasonic transducer (3) is provided with a protective coating.

3. The flotation coal preparation defoaming device according to claim 1, characterized in that, The ultrasonic generator (4) includes a chassis, inside which a circuit board (403) is installed; the circuit board (403) integrates a high-frequency inductor (404) and a high-frequency transformer (405).

4. The flotation coal preparation defoaming device according to claim 3, characterized in that, Heat sinks (402) are installed on the heat-generating elements of the circuit board (403), and a cooling fan (401) is provided at the rear of the chassis.

5. The flotation coal preparation defoaming device according to claim 1, characterized in that, The suspension mechanism includes a motor and a threaded rod. The motor is connected to the ultrasonic transducer (3) through the threaded rod connected to the drive end.

6. The flotation coal preparation defoaming device according to claim 1, characterized in that, A track is set on the crossbeam of the portal frame (2), and an electric push rod is set at one end of the crossbeam of the portal frame (2). The ultrasonic transducer (3) is slidably connected to the track through the bracket, and the telescopic end of the electric push rod is connected to the bracket.

7. The flotation coal preparation defoaming device according to claim 1, characterized in that, The ultrasonic generator (4) is fixedly installed on the column of the gantry bracket (2).

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