An ultrasonic screen unclogging device

Abstract

This utility model discloses an ultrasonic screen unclogging device, comprising: a screen; an ultrasonic generating unit, including an ultrasonic generator and a piezoelectric ceramic transducer, wherein the ultrasonic generator is electrically connected to the piezoelectric ceramic transducer, the piezoelectric ceramic transducer is disposed on the screen, and the piezoelectric ceramic transducer is used to unclogging the screen; a clogging monitoring unit, connected to the screen, for monitoring the clogging status of the screen; and a control unit, electrically connected to both the clogging control unit and the ultrasonic generating unit, for controlling the ultrasonic parameters of the ultrasonic generator. This utility model solves the problems of incomplete screen unclogging, easy damage to the screen, and low unclogging efficiency.

Description

Technical Field

[0001] This utility model relates to the field of material screening technology, and in particular to an ultrasonic screen unclogging device. Background Technology

[0002] In the screening of highly viscous, ultrafine powder materials in industries such as chemicals, food, pharmaceuticals, and electronics, screen clogging is the core problem leading to decreased screening efficiency and even affecting the normal operation of the production line. Existing unclogging technologies mainly use methods such as elastic ball vibration, mechanical vibration, airflow backflushing, or manual unclogging to clean the screen. However, elastic ball vibration can only remove surface dust and cannot remove the adhering substances on the screen holes; mechanical vibration can remove the adhering substances on the screen holes, but its vibration frequency and intensity are difficult to control, which can easily damage the screen and shorten its service life; airflow backflushing systems require additional air sources and pipeline systems, increasing production costs, and the removal effect on adhering substances is not good; manual unclogging is inefficient, labor-intensive, and poses safety hazards. Utility Model Content

[0003] The main purpose of this invention is to provide an ultrasonic screen unclogging device, which aims to solve the problems of incomplete screen unclogging, easy damage to the screen, and low unclogging efficiency.

[0004] To achieve the above objectives, this utility model proposes an ultrasonic screen unclogging device, comprising:

[0005] sieve;

[0006] An ultrasonic generating unit includes an ultrasonic generator and a piezoelectric ceramic transducer. The ultrasonic generator is electrically connected to the piezoelectric ceramic transducer. The piezoelectric ceramic transducer is disposed on the screen and is used to clear blockages from the screen.

[0007] A clogging monitoring unit, connected to the screen, is used to monitor the clogging status of the screen;

[0008] The control unit is electrically connected to both the blockage control unit and the ultrasonic generating unit, and is used to control the ultrasonic parameters of the ultrasonic generator.

[0009] Optionally, the ultrasonic generating unit further includes a frequency converter, which is electrically connected to the ultrasonic generator and used to adjust the parameters of the ultrasonic generator.

[0010] Optionally, the blockage monitoring unit is a differential pressure transmitter, which has a trigger threshold. When the pressure of the screen monitored by the differential pressure transmitter exceeds the trigger threshold, the ultrasonic generating unit begins to clear the blockage.

[0011] Optionally, the trigger threshold is 4 kPa. When the pressure of the screen monitored by the differential pressure transmitter is ≥4 kPa, the ultrasonic generating unit starts to clear the blockage.

[0012] Optionally, a temperature sensor is provided on the piezoelectric ceramic transducer.

[0013] Optionally, the control unit includes a PLC control module and an industrial computer. The input terminal of the PLC control module is electrically connected to the industrial computer, and the output terminal of the PLC control module is electrically connected to the temperature sensor, the blockage monitoring unit, and the frequency converter, respectively.

[0014] Optionally, the surface of the piezoelectric ceramic transducer is coated with a boron nitride thermally conductive coating, the thickness of which is 0.1-0.3 mm.

[0015] Optionally, the piezoelectric ceramic transducer has a sealed housing for encapsulating and protecting the electronic components inside the transducer.

[0016] Optionally, the screen has a plurality of through holes, the aperture of which is 150 μm.

[0017] Optionally, the piezoelectric ceramic transducers are configured to be arranged in zones according to the stress distribution of the screen, wherein the piezoelectric ceramic transducers may be arranged individually in each stress region of the screen, or arranged in an array on the screen.

[0018] The beneficial effects of this utility model are as follows: This application sets the piezoelectric ceramic transducer on the screen, and the ultrasonic generator is electrically connected to the piezoelectric ceramic transducer. The ultrasonic generator transmits the ultrasonic signal to the piezoelectric ceramic transducer. The piezoelectric ceramic transducer uses the piezoelectric effect to convert electrical energy into mechanical energy, generating high-frequency ultrasonic mechanical vibration and directly acting on the screen, thereby preventing materials from sticking to the screen, simplifying the equipment structure, and extending the service life of the screen. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the arrangement structure of the ultrasonic screen unclogging device in this utility model;

[0021] Figure 2This is a schematic diagram of the control principle of the ultrasonic screen unclogging device in this utility model;

[0022] Label Explanation:

[0023] 1. Screen;

[0024] 21. Ultrasonic generator; 22. Piezoelectric ceramic transducer;

[0025] 3. Differential pressure transmitter;

[0026] 4. Control unit; 41. PLC control module; 42. Industrial computer;

[0027] 5. Frequency converter;

[0028] 6. Temperature sensor;

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] One embodiment of this utility model provides an ultrasonic screen unclogging device, referring to... Figure 1 , Figure 2 ,include:

[0034] Screen 1;

[0035] An ultrasonic generating unit includes an ultrasonic generator 21 and a piezoelectric ceramic transducer 22. The ultrasonic generator 21 is electrically connected to the piezoelectric ceramic transducer 22. The piezoelectric ceramic transducer 22 is disposed on the screen 1 and is used to clear blockages from the screen 1.

[0036] A blockage monitoring unit, connected to the screen 1, is used to monitor the blockage status of the screen 1;

[0037] Control unit 4 is electrically connected to both the blockage control unit 4 and the ultrasonic generating unit, and is used to control the ultrasonic parameters of the ultrasonic generator 21.

[0038] This application solves the problems of incomplete cleaning of the screen 1, easy damage to the screen 1, and low cleaning efficiency. By setting a piezoelectric ceramic transducer 22 on the screen 1, and electrically connecting an ultrasonic generator 21 to the piezoelectric ceramic transducer 22, the ultrasonic generator 21 transmits ultrasonic signals to the piezoelectric ceramic transducer 22. The piezoelectric ceramic transducer 22 uses the piezoelectric effect to convert electrical energy into mechanical energy, generating high-frequency ultrasonic mechanical vibrations that directly act on the screen 1, thereby preventing material from adhering to the screen 1, simplifying the equipment structure, and extending the service life of the screen 1. In this embodiment, the piezoelectric ceramic transducer 22 is set along the edge of the screen 1 and is fixedly connected to the screen 1 by welding or riveting. The ultrasonic generator 21 is electrically connected to the piezoelectric ceramic transducer 22. The blockage monitoring unit is set at the edge of the screen 1 and tightly connected to the screen 1. The blockage monitoring unit is used to monitor the pressure difference on both sides of the screen 1 to sense the current blockage status of the screen 1. The control unit 4 receives the differential pressure signal fed back by the blockage detection unit to adjust the output parameters of the ultrasonic generator 21. The control unit 4 controls the ultrasonic generator 21 to transmit ultrasonic signals to the piezoelectric ceramic transducer 22. The piezoelectric ceramic transducer 22 uses the piezoelectric effect to convert electrical energy into mechanical energy and generate high-frequency ultrasonic waves of 20-40kHz. This causes high-frequency, low-amplitude vibration waves to be superimposed on the surface of the screen 1, thereby preventing materials from adhering to the screen 1, simplifying the equipment structure, and extending the service life of the screen 1.

[0039] Furthermore, the ultrasonic generating unit also includes a frequency converter 5, which is electrically connected to the ultrasonic generator 21 and used to adjust the parameters of the ultrasonic generator 21. In this embodiment, the output terminal of the frequency converter 5 is electrically connected to the ultrasonic generator 21, the input terminal is electrically connected to the control unit 4, and the power supply terminal of the frequency converter 5 is connected to an external power supply. Based on the differential pressure signal of the screen 1 fed back by the blockage monitoring unit, the output frequency of the ultrasonic generator 21 is dynamically adjusted by the frequency converter 5. Specifically, the frequency converter 5 achieves precise adjustment of the ultrasonic frequency generated by the ultrasonic generator 21 by changing the power supply frequency input to the ultrasonic generator 21, so that the piezoelectric ceramic transducer 22 always works in the optimal resonance state, thereby controlling the vibration frequency and amplitude of the screen 1. The control unit 4 can adjust the output frequency of the ultrasonic generator 21 in real time through the frequency converter 5 according to the actual degree of clogging of the screen 1, so as to ensure that the piezoelectric ceramic transducer 22 always works in the optimal vibration mode. This not only ensures the peeling efficiency of the high-frequency vibration on the adhered material, but also avoids the screen 1 overload or clogging blind zone that may occur under fixed parameters, and significantly improves the adaptability and energy efficiency of the clogging system.

[0040] Furthermore, the blockage monitoring unit is a differential pressure transmitter 3, which has a trigger threshold. When the pressure of the screen 1 monitored by the differential pressure transmitter 3 exceeds the trigger threshold, the ultrasonic generating unit begins to clear the blockage. In this embodiment, the blockage monitoring unit is a differential pressure transmitter 3, which assesses the current degree of blockage of the screen 1 by monitoring the pressure difference across the screen 1 in real time. Specifically, when the through holes of screen 1 become clogged due to material adhesion, the pressure on the feed side of screen 1 increases while the pressure on the discharge side decreases, resulting in a larger pressure difference across screen 1. Since the pressure difference transmitter 3 has a trigger threshold, when the pressure difference across screen 1 exceeds the trigger threshold, the control unit 4 determines that screen 1 has entered a state requiring unclogging and triggers the ultrasonic generator unit to start the unclogging program. During this process, the control unit 4 dynamically adjusts the output frequency of the ultrasonic generator 21 through the frequency converter 5, causing the piezoelectric ceramic transducer 22 to generate high-frequency vibrations that resonate with the inherent frequency of screen 1, thereby peeling off the adhered material on screen 1. At the same time, it adjusts the vibration amplitude according to the pressure difference signal fed back by the pressure difference transmitter 3 in real time to avoid damage to screen 1 due to excessive vibration and shorten the service life of screen 1.

[0041] Furthermore, the trigger threshold is 4 kPa. When the pressure of the screen 1 monitored by the differential pressure transmitter 3 is ≥ 4 kPa, the ultrasonic generating unit begins to clear the blockage. In this embodiment, the trigger threshold of the differential pressure transmitter 3 is 4 kPa, that is, when the pressure difference between the two sides of the screen 1 monitored in real time by the differential pressure transmitter 3 reaches or exceeds the preset 4 kPa trigger threshold, the control unit 4 will immediately start the blockage clearing procedure.

[0042] Furthermore, a temperature sensor 6 is provided on the piezoelectric ceramic transducer 22. In this embodiment, the temperature sensor 6 is provided on the piezoelectric ceramic transducer 22. The temperature sensor 6 is used to display the temperature of the ceramic transducer in real time and feed it back to the control unit 4. When the temperature of the piezoelectric ceramic transducer 22 is >80℃, the control unit 4 will trigger the overheat protection mechanism and start the automatic power-off protection function to cut off the power to the piezoelectric ceramic transducer 22 and stop its vibration. This avoids the depolarization phenomenon and structural deformation of the piezoelectric ceramic transducer 22 caused by continuous high temperature, extends the service life of the piezoelectric ceramic transducer 22, and avoids safety hazards caused by equipment overheating.

[0043] Furthermore, the control unit 4 includes a PLC control module 41 and an industrial computer 42. The input terminal of the PLC control module 41 is electrically connected to the industrial computer 42, and the output terminal of the PLC control module 41 is electrically connected to the temperature sensor 6, the blockage monitoring unit, and the frequency converter 5, respectively. In this embodiment, the control unit 4 includes a PLC control module 41 and an industrial computer 42. The industrial computer 42 has preset parameters, and the PLC control module 41 has a built-in PID control algorithm. It can receive the differential pressure signal of the screen 1 transmitted by the differential pressure transmitter 3 and the temperature data of the piezoelectric ceramic transducer 22 collected by the temperature sensor 6 in real time. After receiving the data, the PLC control module 41 analyzes and processes the data according to the built-in PID control algorithm. When the differential pressure transmitter 3 receives a signal indicating screen 1 blockage, the PLC control module 41 determines whether to initiate a clearing procedure based on the preset trigger threshold of the differential pressure transmitter 3, and sends a control command to the frequency converter 5 to adjust the operating parameters of the ultrasonic generator 21. Simultaneously, the PLC control module 41 transmits equipment operating data to the industrial computer 42 in real time. The industrial computer 42 integrates and processes the data, then displays information such as the degree of screen 1 blockage, ultrasonic operating parameters, and the temperature of the piezoelectric ceramic transducer 22 on the operating interface, allowing operators to monitor the equipment's operating status promptly. Furthermore, when the temperature of the piezoelectric ceramic transducer 22 exceeds 80℃, the PLC control module 41 immediately issues a power-off command, cutting off the power supply to the piezoelectric ceramic transducer 22 and sending a high-temperature warning to the industrial computer 42.

[0044] Furthermore, the surface of the piezoelectric ceramic transducer 22 is coated with a boron nitride thermally conductive coating, the thickness of which is 0.1-0.3 mm. In this embodiment, the boron nitride thermally conductive coating on the surface of the piezoelectric ceramic transducer 22 has excellent thermal conductivity, which can quickly conduct the heat generated by the piezoelectric ceramic transducer 22 to the transducer substrate, reducing the surface temperature of the piezoelectric ceramic transducer 22 for efficient heat dissipation. Simultaneously, the boron nitride thermally conductive coating also has good corrosion resistance, isolating the piezoelectric ceramic from external conductive media, preventing piezoelectric performance degradation caused by electrochemical corrosion, and extending the service life of the piezoelectric ceramic transducer 22. Specifically, the thickness of the boron nitride thermal conductive coating is 0.1-0.3 mm. When the thickness of the boron nitride thermal conductive coating is <0.1 mm, the coating thickness is too thin, which will lead to an increase in contact thermal resistance and heat accumulation on the surface of the piezoelectric ceramic transducer 22, accelerating the depolarization of the material. When the thickness of the boron nitride thermal conductive coating is >0.3 mm, the coating thickness is too thick, which will increase the equivalent mass of the transducer, reduce the resonant frequency, and lead to a decrease in vibration energy conversion efficiency.

[0045] Furthermore, the piezoelectric ceramic transducer 22 has a sealed housing for encapsulating and protecting the internal electronic components. In this embodiment, the piezoelectric ceramic transducer 22 has a sealed housing with an IP65 protection rating to prevent external dust, moisture, and other impurities from entering the piezoelectric ceramic transducer 22.

[0046] Furthermore, the screen 1 has a plurality of through holes, the aperture of which is 150 μm. Specifically, when the material is potassium carbonate powder, the aperture of the through holes in the screen 1 is set to 150 μm, and the initial ultrasonic value is set to 25 kHz / 120 W. The differential pressure of the screen 1 is monitored in real time by the differential pressure transmitter 3. When the equipment starts, the ultrasonic generator 21 enters the preset initial value mode of 25kHz / 120W. After 30 seconds, the differential pressure transmitter 3 detects that the pressure difference across the screen 1 increases from the initial 1.8kPa to 4kPa, reaching the trigger threshold. The PLC control module 41 determines that the screen 1 is blocked and immediately adjusts the power of the ultrasonic generator 21 to 200W through the frequency converter 5 to increase the intensity of ultrasonic mechanical vibration and break up the material clumps blocking the screen 1. After 60 seconds, the pressure difference drops from 4.2kPa to 3.1kPa, indicating that the material blocking the screen 1 has been partially cleared. At this time, to avoid excessive vibration and damage to the screen 1, the PLC control module controls the frequency converter 5 to adjust the power to 100W, ensuring the unblocking effect while reducing energy consumption. After 90 seconds, the pressure difference stabilizes at 1.8kPa, the screen 1 returns to normal operation, and the PLC control module controls the ultrasonic generator 21 to switch to 50W. In the maintenance mode, ultrasonic vibration is continuously generated at a low power to prevent material from adhering and clogging screen 1 again. When 120s have passed, the system maintains the 50W maintenance mode. At the same time, the PLC control module works in conjunction with the clogging monitoring unit, temperature sensor 6, etc., to continuously monitor the clogging status of screen 1 and the temperature of piezoelectric ceramic transducer 22. Once an abnormality occurs, it will immediately respond and handle the situation according to the preset program.

[0047] Furthermore, the piezoelectric ceramic transducers 22 are configured to be arranged in zones according to the stress distribution of the screen 1. Specifically, the piezoelectric ceramic transducers 22 can be individually arranged in each stress region of the screen 1, or arranged in an array on the screen 1. The position of the piezoelectric ceramic transducers 22 is determined based on the stress distribution of the screen 1. When enhanced local unblocking effect is required, the piezoelectric ceramic transducers 22 are arranged in stress concentration areas, i.e., individually arranged in edge support areas or material impact areas. When the screen 1 has a large area or the stress distribution on the screen 1 is uniform, the piezoelectric ceramic transducers 22 are arranged in an array along the edge of the screen 1 to achieve comprehensive unblocking.

[0048] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An ultrasonic screen unclogging device, characterized in that, include: sieve; An ultrasonic generating unit includes an ultrasonic generator and a piezoelectric ceramic transducer. The ultrasonic generator is electrically connected to the piezoelectric ceramic transducer. The piezoelectric ceramic transducer is disposed on the screen and is used to clear blockages from the screen. A clogging monitoring unit, connected to the screen, is used to monitor the clogging status of the screen; The control unit is electrically connected to both the blockage control unit and the ultrasonic generating unit, and is used to control the ultrasonic parameters of the ultrasonic generator.

2. The ultrasonic screen unclogging device of claim 1, wherein, The ultrasonic generating unit also includes a frequency converter, which is electrically connected to the ultrasonic generator and is used to adjust the parameters of the ultrasonic generator.

3. The ultrasonic screen unclogging device of claim 1, wherein, The blockage monitoring unit is a differential pressure transmitter. The differential pressure transmitter has a trigger threshold. When the pressure of the screen monitored by the differential pressure transmitter exceeds the trigger threshold, the ultrasonic generating unit starts to clear the blockage.

4. The ultrasonic screen unclogging device of claim 3, wherein, The trigger threshold is 4 kPa. When the pressure of the screen monitored by the differential pressure transmitter is ≥ 4 kPa, the ultrasonic generating unit starts to clear the blockage.

5. The ultrasonic screen unclogging device of claim 2, wherein, A temperature sensor is installed on the piezoelectric ceramic transducer.

6. The ultrasonic screen unclogging device of claim 5, wherein, The control unit includes a PLC control module and an industrial computer. The input terminal of the PLC control module is electrically connected to the industrial computer, and the output terminal of the PLC control module is electrically connected to the temperature sensor, the blockage monitoring unit, and the frequency converter, respectively.

7. The ultrasonic screen unclogging device of claim 1, wherein, The surface of the piezoelectric ceramic transducer is coated with a boron nitride thermally conductive coating, the thickness of which is 0.1-0.3 mm.

8. The ultrasonic screen unclogging device of claim 1, wherein, The piezoelectric ceramic transducer has a sealed housing for encapsulating and protecting the internal electronic components.

9. The ultrasonic screen unclogging device of claim 1, wherein, The screen has a plurality of through holes, the diameter of which is 150 μm.

10. The ultrasonic screen unclogging device of claim 1, wherein, The piezoelectric ceramic transducers are configured to be arranged in zones according to the stress distribution of the screen, wherein the piezoelectric ceramic transducers may be arranged individually in each stress zone of the screen, or arranged in an array on the screen.

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