Array type ultrasonic belt conveying coal flow intelligent measuring equipment
By employing array-type ultrasonic technology, the existing technical problems in the prior art are solved. By using ultrasonic transducers for non-contact measurement, high-precision coal flow measurement is achieved. This results in accurate and stable measurement, enabling precise measurement of the instantaneous and cumulative coal flow of belt conveyors. It also solves the problems of large drift, low accuracy, and the need for frequent calibration in the prior art, achieving high stability and high precision measurement.
Patent Information
- Application Number
- CN202520674236.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-04-10
AI Technical Summary
Existing belt scales suffer from problems such as large drift, low accuracy, frequent calibration, and complex installation when measuring coal flow. Nuclear scales have problems such as high radiation, high management responsibility, and high cost. Laser scales are greatly affected by environmental factors, have high cost, and large accuracy errors.
An array-type ultrasonic belt conveyor coal flow intelligent measurement device is adopted. It uses array ultrasonic transducers for non-contact measurement. Combined with components such as MCU module, power supply module, operational amplifier and comparator, it achieves accurate measurement through timing control logic module and signal processing. It is installed above the belt for distance measurement.
It achieves accurate measurement of instantaneous and cumulative coal flow in belt conveyors, is easy to install, unaffected by the environment, has strong anti-interference ability, simple structure, easy maintenance, and high stability and high precision.
Smart Images
Figure CN223896863U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the belt scale measurement field, concretely relates to a belt conveying coal flow intelligent measurement system. BACKGROUND
[0002] Belt conveying is the main mode of coal transportation in coal mine, electric power, metallurgy, chemical industry and other industries. At present, the belt conveying coal flow measurement is mostly piezoelectric belt scale, and there are also nuclear scale, laser scale and other modes. However, the piezoelectric belt scale has the problems of large drift, low precision, frequent calibration, complex installation and the like in coal flow measurement. The nuclear scale has the problems of large radiation, large management responsibility, high cost and the like. The laser scale has the problems of large influence by environment such as humidity, dust, light and the like, high cost, large precision error and the like, which affect its application. CONTENT
[0003] The utility model aims at providing a kind of array type ultrasonic belt conveying coal flow intelligent measurement equipment, with intelligent, measurement data accurate, measurement signal anti-interference and the like.
[0004] The technical scheme of the utility model is a kind of array type ultrasonic belt conveying coal flow intelligent measurement equipment, including host computer, MCU module, power module, operational amplifier and comparator, two-way signal selector, transmitting signal step-up amplification module, array ultrasonic transducer;The array ultrasonic transducer is alternately arranged by different frequency ultrasonic transducer groups;Each group of ultrasonic transducer group is composed of 2 same frequency transceiving range-finding transducers;
[0005] Power module provides power supply for MCU module, two-way signal selector, transmitting signal step-up amplification module;
[0006] MCU module communicates with host computer by 485 bus, and two-way signal selector is controlled to realize the selection of transceiving range-finding transducer received signal;
[0007] Operational amplifier and comparator are electrically connected with two-way signal selector, amplify and trigger the signal after two-way, and the signal after processing is fed back to MCU module;
[0008] Transmitting signal step-up amplification module is electrically connected with array ultrasonic transducer, and MCU module controls transmitting signal step-up amplification module, converts electric signal into acoustic signal, controls the emission and reception of transceiving range-finding transducer.
[0009] Further, the MCU module is integrated with a timing control logic module, a clock generator / divider, an ultra-low noise preamplifier A1, a high-Q bandpass amplifier A2, a high-Q bandpass amplifier A4, an automatic gain logarithmic amplifier A3, a delay integration amplifier A5, a synchronous phase-sensitive amplifier A6, frequency selective amplifiers A7 and A8, an amplification / high-voltage driving circuit A0, a target distance detection circuit, and a material thickness variation trend detection circuit.
[0010] The timing control logic module realizes communication with the system and controls the timing of the transmitting and receiving pulses of the transducer. The ultra-low noise preamplifier A1 is electrically connected with the high-Q bandpass amplifier A2, the high-Q bandpass amplifier A2 is electrically connected with the automatic gain logarithmic amplifier A3, the automatic gain logarithmic amplifier A3 is electrically connected with the high-Q bandpass amplifier A4 and the synchronous phase-sensitive amplifier A6, respectively, and the delay integration amplifier A5 is electrically connected with the automatic gain logarithmic amplifier A3.
[0011] The different clock signals transmitted by the clock generator / divider and the different timing signals transmitted by the timing control logic module are sent together into the high-Q bandpass amplifier A4 for processing to obtain the phase-sensitive amplification synchronization signal V G (t).
[0012] The timing control logic module processes the different clock signals transmitted by the clock generator / divider and outputs the processed signals. The different clock signals transmitted by the clock generator / divider and the different timing output signals processed by the timing control logic module are sent together into the amplification / high-voltage driving circuit A0 for signal amplification processing to drive the corresponding transducer to emit ultrasonic waves. The different transmitting echo signals received by the transducer are sent into the ultra-low noise preamplifier A1 for noise reduction processing, and then sent together with the different timing signals into the high-Q bandpass amplifier A2 for amplification processing. The processed signals are sent into the automatic gain logarithmic amplifier A3 for processing. The different timing signals transmitted by the timing control logic module are sent into the delay integration amplifier A5, and the processed signals are also sent into the automatic gain logarithmic amplifier A3 for processing. After being processed by the automatic gain logarithmic amplifier A3, the continuous scattering echo signal V C (t) is obtained.
[0013] The continuous scattering echo signal V C (t) and the phase-sensitive amplification synchronization signal V G (t) are sent together into the synchronous phase-sensitive amplifier A6 for processing. After phase-sensitive amplification processing, the output signals of the frequency selective amplifiers A7 and A8 are V D (t) and V E (t), respectively.
[0014] The timing control logic module processes the different timing signals, the different clock signals output by the clock generator / divider, and the f(2w+ω θThe signals are fed into the target distance detection circuit for signal quality and time phase detection; the received continuous scattered echo V is measured. C (t) The instantaneous distance between the transducer and the target under test is obtained relative to the delay time of the transmitted pulse;
[0015] The timing control logic module will combine different timing signals with different clock signals generated by the clock generator / divider, and then combine them with f(ω). θ Simultaneously, the material thickness change trend detection circuit is fed in to calculate the coal flow thickness.
[0016] Furthermore, the array of ultrasonic transducers is installed above the conveyor belt to measure the distance to the coal flow surface on the conveyor belt.
[0017] Furthermore, it also includes a sound velocity calibration transmitting transducer and a sound velocity calibration receiving transducer symmetrically mounted on the two side frames of the belt. The sound velocity calibration transmitting transducer is controlled by the MCU module to emit sound pulses, and the sound velocity calibration receiving transducer pulses are detected and timed, thereby calibrating the air sound velocity in real time.
[0018] This utility model has the following beneficial effects:
[0019] 1. This utility model adopts the non-contact measurement principle of array ultrasonic transducers, effectively solving the problems of large drift, low accuracy, frequent calibration, and complex installation of piezoelectric belt scales in coal flow measurement; nuclear scales suffer from high radiation, heavy management responsibility, and high cost; and laser scales are greatly affected by environmental factors such as humidity, dust, and light, resulting in high cost and large accuracy errors.
[0020] 2. This utility model adopts non-contact measurement, is easy to install, and is not affected by environmental factors such as light, humidity, temperature, and dust, and has a wide range of application prospects.
[0021] 3. This utility model can accurately measure the instantaneous and cumulative coal flow of the belt conveyor in real time, and can also adjust the belt running speed according to the coal flow.
[0022] 4. The equipment of this utility model has a simple structure, is easy to install and maintain, and has many advantages such as intelligence, accurate measurement data, high stability, and strong anti-interference. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the system structure of this utility model;
[0024] Figure 2 This is a ranging logic circuit diagram with a transducer transmitting at a frequency of 75kHz.
[0025] Figure 3 This is a ranging logic circuit diagram with a transducer transmitting at a frequency of 50kHz. DETAILED DESCRIPTION
[0026] The utility model contents will be explained in detail below in combination with the drawings of the specification.
[0027] As Figure 1 The array type ultrasonic wave belt conveying coal flow intelligent measuring equipment, including host computer, MCU module, power module, operational amplifier and comparator, two alternative signal selector, transmitting signal step-up amplification module, array ultrasonic wave transducer, the array ultrasonic wave transducer is by different frequency ultrasonic wave transducer group alternately arranged, each group ultrasonic wave transducer group is by 2 same frequency transceiving dual-purpose ranging transducer composition.
[0028] The power module provides power supply for the MCU module, the two alternative signal selector and the transmitting signal step-up amplification module.
[0029] The MCU module communicates with the host computer through the 485 bus and controls the two alternative signal selector to select the receiving signal of the transceiving dual-purpose ranging transducer.
[0030] The operational amplifier and the comparator are electrically connected with the two alternative signal selector, amplify and trigger the signal after two alternatives, and feed back the processed signal to other circuits in the MCU module.
[0031] The transmitting signal step-up amplification module is electrically connected with the array ultrasonic wave transducer, and the MCU module controls the transmitting signal step-up amplification module to convert the electric signal into the acoustic signal and control the transmission and reception of the transceiving dual-purpose ranging transducer.
[0032] Further comprising the sound velocity calibration transmitting transducer and the sound velocity calibration receiving transducer symmetrically installed on the frame on both sides of the belt, the sound velocity calibration transmitting transducer is controlled to emit the sound pulse through the MCU module, the sound velocity calibration receiving transducer pulse is detected and timed, so that the air sound velocity is calibrated in real time.
[0033] As Figure 2 As shown in the drawings, the MCU module is integrated with a timing control logic module, a clock generator / divider, an ultra-low noise preamplifier A1, a high-Q bandpass amplifier A2, a high-Q bandpass amplifier A4, an automatic gain logarithmic amplifier A3, a delay integration amplifier A5, a synchronous phase-sensitive amplifier A6, a frequency selection amplifier A7 and A8, an amplification / high-voltage driving circuit A0, a target distance detection circuit, a material thickness change trend detection circuit.
[0034] The time sequence control logic module realizes communication with the host computer and controls the time sequence of the transmitting and receiving pulse of the transducer; the ultra-low noise preamplifier A1 is electrically connected with the high Q bandpass amplifier A2, the high Q bandpass amplifier A2 is electrically connected with the automatic gain logarithmic amplifier A3, the automatic gain logarithmic amplifier A3 is respectively electrically connected with the high Q bandpass amplifier A4 and the synchronous phase sensitive amplifier A6, and the delay integration amplifier A5 is electrically connected with the automatic gain logarithmic amplifier A3;
[0035] The CLK13 clock signal transmitted by the clock generator / divider is sent into the high Q bandpass amplifier A4 together with the EN11 time sequence signal transmitted by the time sequence control logic module, and the phase sensitive amplification synchronous signal V G (t) is obtained after processing.
[0036] The CLK11 clock signal transmitted by the clock generator / divider is processed and output by the time sequence control logic module; the CLK13 clock signal transmitted by the clock generator / divider is sent into the amplification / high voltage driving circuit A0 together with the CTRL11 output signal processed by the time sequence control logic module, and the corresponding transducer is driven to emit ultrasonic waves after signal amplification processing; the different transmitting echo signals received by the transducer are sent into the ultra-low noise preamplifier A1 for denoising processing, and then are sent into the high Q bandpass amplifier A2 together with the EN11 time sequence signal for amplification processing, and the signals processed by amplification are sent into the automatic gain logarithmic amplifier A3 for processing; the EN11 time sequence signal transmitted by the time sequence control logic module is sent into the delay integration amplifier A5, and the signal processed by the delay integration amplifier A5 is also sent into the automatic gain logarithmic amplifier A3 for processing.
[0037] The continuous scattering echo signal V C (t) is obtained after simultaneous processing by the automatic gain logarithmic amplifier A3.
[0038] The continuous scattering echo signal V C (t) is obtained after simultaneous processing by the automatic gain logarithmic amplifier A3. G (t) is sent into the synchronous phase sensitive amplifier A6 for processing, and the output signals of the frequency selection amplifiers A7 and A8 after phase sensitive amplification processing are V D (t) and V E (t) respectively.
[0039] The EN12 time sequence signal, the CLK12 clock signal output by the clock generator / divider and f(2w+ω θ ) are sent into the target distance detection circuit together for signal quality detection and time phase detection; the instantaneous distance between the transducer and the measured target is obtained by measuring the delay time of the continuous scattering echo V C (t) relative to the transmitting pulse.
[0040] The timing control logic module sends the EN13 timing signal, the clock generator / divider sends the CLK11, 12 clock signals, and the material thickness variation trend detection circuit receives the signals at the same time, so as to calculate the coal flow thickness.
[0041] When the belt speed is high, in order to improve the measurement accuracy of the array ultrasonic transducer and reduce the interference of adjacent transducers, the adjacent two groups of transducers have different transmission frequencies. Figure 2 As shown in the figure, one is 50KHz, as shown in the figure, Figure 3 Therefore, the Figure 3 will not be described in detail.
[0042] The utility model discloses a non-contact measurement coal flow, support is installed on the both sides bridge of belt conveyor, support height 1~1.5 meters, support top and equipment box connection, install ultrasonic transducer array, main control circuit board etc. in the box.
[0043] The embodiment has 12 transceiving dual-purpose ranging transducers, in order to avoid sound wave scattering and mutual interference of adjacent sound channels, the two transceiving dual-purpose ranging transducers in each group are alternately received and transmitted, i.e. 1, 3, 5, 7, 9, 11 number transducers simultaneously transmit, simultaneously receive; 2, 4, 6, 8, 10, 12 number transducers simultaneously transmit, simultaneously receive, so as to realize fast array measurement in unit time.
[0044] The utility model discloses a ultrasonic ranging principle, utilize the ultrasonic wave of the i th transducer and measure the distance between coal flow upper surface and transducer l ij (i indicates the i th transducer, and j indicates the j th time), subtract l pi ( fixed value) from the distance L ij between the belt and each transducer to obtain the instantaneous height of coal flow, i.e. thickness, and finally calculate the thickness of the belt coal on the sound axis of the 12 transducers.
[0045] Multiply each array measurement time in a fixed time period (for example, 1 minute or 1 hour) with the belt speed, then multiply the instantaneous cross-sectional area of the coal flow, so as to calculate the instantaneous coal flow volume, if multiplied by the average density of coal, the instantaneous flow can be obtained, and the cumulative flow in the fixed time period is accumulated, so as to obtain the cumulative flow in the time period.
[0046] The formula is as follows:
[0047]
[0048] In the formula, q is instantaneous flow, Q is cumulative flow, is average density, and υ is belt speed. In the formula, q is instantaneous flow, Q is cumulative flow, is average density, and υ is belt speed.j - instantaneous belt speed; W i - width measured by the i-th channel; L pi - distance of the i-th transducer from the belt in the axial direction; l ij - distance of the i-th transducer from the coal surface of the belt; L pi - l ij - average coal thickness of the i-th channel; Δt j - sampling time interval; m is the number of instantaneous flow samples in a fixed time period.
[0049] In order to obtain a higher amount of data, to improve the transducer array element density, and to use the same transducer for receiving and transmitting, the sound axis of the transducer is coincident, which creates conditions for using a high directivity index transducer.
[0050] The number of transducers installed above the belt is set according to the width of the belt; the transducers use two frequencies of about 50 kHz and 75 kHz, and the transducers use a horn; one MCU module can control at least 12 transducers, the host computer uses an RS485 interface, the power supply is 12V-24V wide voltage input, and when the height of the rack is 1.5m, the detection height is 1.2m (the maximum measurement distance).
[0051] The array type ultrasonic belt conveying coal flow intelligent measurement device developed by the utility model has good stability, higher dynamic measurement accuracy, and almost no calibration compared with the widely used electronic scale.
Claims
1. An array-type ultrasonic belt conveyor coal flow intelligent measurement device, characterized in that, It includes a main control unit, an MCU module, a power supply module, an operational amplifier and comparator, a 2-to-1 signal selector, a transmit signal boost amplification module, and an array of ultrasonic transducers; the array of ultrasonic transducers consists of alternating groups of ultrasonic transducers of different frequencies; each group of ultrasonic transducers consists of two transceiver ranging transducers of the same frequency. The power module provides power to the MCU module, the 2-to-1 signal selector, and the transmit signal boost amplifier module; The MCU module communicates with the host computer via the 485 bus and controls the two-to-one signal selector to select the signal received by the transceiver ranging transducer. The operational amplifier and comparator are electrically connected to the 2-to-1 signal selector to amplify and trigger the selected signal. The processed signal is then fed back to the MCU module. The transmit signal boost amplification module is electrically connected to the array ultrasonic transducer. It controls the transmit signal boost amplification module to convert the electrical signal into an acoustic signal, and controls the transmission and reception of the transceiver.
2. The array-type ultrasonic belt conveyor coal flow intelligent measurement device as described in claim 1, characterized in that, The MCU module integrates a timing control logic module, a clock generator / divider, an ultra-low noise preamplifier A1, a high-Q bandpass amplifier A2, a high-Q bandpass amplifier A4, an automatic gain logarithmic amplifier A3, a delay integral amplifier A5, a synchronous phase-sensitive amplifier A6, frequency selective amplifiers A7 and A8, an amplification / high voltage drive circuit A0, a target distance detection circuit, and a material thickness change trend detection circuit. The timing control logic module realizes the communication with the system and controls the timing of the transducer's transmit and receive pulses; the ultra-low noise preamplifier A1 is electrically connected to the high-Q bandpass amplifier A2, the high-Q bandpass amplifier A2 is electrically connected to the automatic gain logarithmic amplifier A3, the automatic gain logarithmic amplifier A3 and the high-Q bandpass amplifier A4 are respectively electrically connected to the synchronous phase-sensitive amplifier A6, and the delay integral amplifier A5 is electrically connected to the automatic gain logarithmic amplifier A3. Different clock signals emitted by the clock generator / divider and different timing signals sent by the timing control logic module are fed together into the high-Q bandpass amplifier A4 for processing to obtain the phase-sensitive amplified synchronization signal V. G (t); The timing control logic module processes the different clock signals received from the clock generator / divider and outputs them. Different clock signals emitted by the clock generator / divider and different timing output signals processed by the timing control logic module are fed into the amplification / high-voltage drive circuit A0. After signal amplification, the corresponding transducers are driven to perform ultrasonic transmission. The transducers send the different transmitted echo signals received to the ultra-low noise preamplifier A1 for noise reduction, and then send them together with the different timing signals to the high-Q bandpass amplifier A2 for amplification. The amplified signals are then sent to the automatic gain logarithmic amplifier A3 for processing. The different timing signals sent by the timing control logic module are sent to the delay integration amplifier A5, and the processed signals are also sent to the automatic gain logarithmic amplifier A3 for processing. After simultaneous processing by the automatic gain logarithmic amplifier A3, the continuous scattered echo signal V is obtained. C (t); Continuous scattered echo signal V C (t) and the phase-sensitive amplified synchronization signal V G (t) Simultaneously, the signals are fed into the synchronous phase-sensitive amplifier A6 for processing. After phase-sensitive amplification, the output signals of the frequency selective amplifiers A7 and A8 are V respectively. D (t) and V E (t); The timing control logic module combines different timing signals, different clock signals output by the clock generator / divider, and f(2w+ω) θ The signals are fed into the target distance detection circuit for signal quality and time phase detection; the received continuous scattered echo V is measured. C (t) The instantaneous distance between the transducer and the target under test is obtained relative to the delay time of the transmitted pulse; The timing control logic module will combine different timing signals with different clock signals generated by the clock generator / divider, and then combine them with f(ω). θ Simultaneously, the material thickness change trend detection circuit is fed in to calculate the coal flow thickness.
3. The array-type ultrasonic belt conveyor coal flow intelligent measurement device as described in claim 1, characterized in that, The array of ultrasonic transducers is installed above the conveyor belt to measure the distance to the coal flow surface on the belt.
4. The array-type ultrasonic belt conveyor coal flow intelligent measurement device as described in claim 1, characterized in that, It also includes a sound velocity calibration transmitting transducer and a sound velocity calibration receiving transducer symmetrically mounted on the two side frames of the belt. The sound velocity calibration transmitting transducer is controlled by the MCU module to emit sound pulses, and the sound velocity calibration receiving transducer pulses are detected and timed, thereby calibrating the air sound velocity in real time.