A coal flow monitoring and control method

Abstract

The present application discloses a coal flow monitoring and control method, which relates to the technical field of coal flow control. The method uses a coal flow monitoring and control system, which includes: a belt conveyor, on which a belt is arranged, and the belt is driven by a motor with a frequency converter; a collection component one, which is fixedly arranged on the belt conveyor, and the collection component one is composed of a weighing roller, a speed sensor, and a signal processing system; a collection component two, which is fixedly arranged on the belt conveyor, and the collection component one is symmetrically arranged into two groups, and the two groups of the collection components two are distributed on both sides of the belt conveyor; a collection component three, which is placed above the belt conveyor through a bracket; the collection component one, the collection component two, and the collection component three are arranged in sequence in the transmission direction of the belt conveyor, and the belt conveyor is also provided with a controller and a centralized controller to reduce the influence of errors and hysteresis and improve the overall transportation efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of coal flow control, and in particular to a coal flow monitoring and control method. Background Art

[0002] Coal is one of the main energy sources in my country. Its production process includes mining, support and transportation, and belt conveyors are an indispensable and important transportation equipment in coal mining. Compared with other conveying equipment, belt conveyors have the characteristics of long conveying distance, large conveying capacity and stable operation. Its operating performance directly determines the economic benefits of coal mines. Belt conveyors generally distribute motors and conveyor belts according to the maximum transportation capacity. However, since underground production is affected by geological structure, gas, water, operating stability of mining equipment and staffing, etc., the production of raw coal has a certain imbalance. Fuzzy belt conveyors are often in a light load or no-load operation state for a long time, which not only wastes energy, but also increases the loss of the conveyor and shortens its service life.

[0003] The coal flow detection system detects the coal flow in real time and can adjust the conveyor belt speed in real time according to the coal flow, thereby improving the efficiency, safety and measurement accuracy of coal transportation. However, how to accurately and quickly monitor the coal flow in real time is the key point. However, due to the influence of errors and hysteresis, the overall effect of improving the transportation efficiency is not obvious.

[0004] Therefore, it is necessary to provide a coal flow monitoring and control method to solve the problems raised in the above background technology. Summary of the invention

[0005] To achieve the above objectives, the present application provides the following technical solutions: a coal flow monitoring and control method, which uses a coal flow monitoring and control system, the coal flow monitoring and control system comprising:

[0006] A belt conveyor, on which a belt is arranged, and the belt is driven by a motor with a frequency converter;

[0007] A collection component 1 is fixedly arranged on the belt conveyor, and the collection component 1 is composed of a weighing roller, a speed sensor, and a signal processing system;

[0008] The collecting component 2 is fixedly arranged on the belt conveyor, and the collecting component 1 is symmetrically arranged into two groups, and the two groups of collecting components 2 are distributed on both sides of the belt conveyor;

[0009] A collecting component three is placed above the belt conveyor through a bracket;

[0010] The collecting component 1, the collecting component 2 and the collecting component 3 are arranged in sequence in the transmission direction of the belt conveyor, and the belt conveyor is also provided with a controller and a centralized controller.

[0011] Further, as a preference, the collection component measures the coal flow value M by weighing the roller. p The belt transmission speed V is obtained by the speed sensor, and M is converted into p and V are transmitted to the centralized controller.

[0012] Further, as a preferred embodiment, the acquisition component 2 includes a high-definition camera and a signal transmitter, wherein the high-definition camera is used to collect the image signal of the coal body passing on the belt, and the signal is transmitted to the centralized controller through the signal transmitter, and the image is analyzed and calculated in the centralized controller to collect the key points of the coal flow section, estimate the coal flow section, and thereby obtain the instantaneous coal flow M st , and calculate the corresponding expected belt speed V st .

[0013] Further, as a preferred embodiment, the acquisition component three includes a laser transmitter, a high-definition camera and a signal transmitter. The laser is projected onto the surface of the conveyor belt by the laser transmitter to form highlight stripes. The image information containing the highlight stripes is collected by the high-definition camera and transmitted to the centralized controller through the signal transmitter. The image is analyzed and calculated in the centralized controller to collect the accurate contour line of the coal flow section, the coal flow section is calculated, and the instantaneous coal flow M is obtained. s , and calculate the corresponding expected belt speed V s .

[0014] Further, as a preference, the control signal is converted by the centralized controller and the controller and transmitted to the frequency converter to regulate the motor.

[0015] Furthermore, as a preferred method, the instantaneous coal flow M is classified into grades M n , the difference in level division is 30%; take M 0 、M 1 、M 2 ...; and correspondingly divide the expected belt speed V expn .

[0016] The coal flow monitoring and control method comprises:

[0017] Ⅰ. M measured by p Determine the appropriate M n , adjust the belt speed V to the corresponding desired belt speed V expn ;

[0018] Ⅱ. If the measured M p The corresponding M n The value does not change, wait and follow the measured M st , the corresponding V st In V expn-1 and Vexpn+1 If V is between V st ;

[0019] III. Wait and follow the measured M s , the corresponding V s In V expn-1 and V expn+1 If V is between V s .

[0020] Further, as a preferred embodiment, wherein V st and V s In the presence of both, V s Priority over V st .

[0021] Furthermore, as a preferred embodiment, V st and V s Not in V expn-1 and V expn+1 In between, V is not adjusted.

[0022] Further, as a preferred embodiment, the measured M p The corresponding M n If the value changes, the belt speed V is changed to the corresponding expected belt speed V. expn .

[0023] Compared with the prior art, the present application provides a coal flow monitoring and control method, which has the following beneficial effects:

[0024] This application is based on the belt scale monitoring system, fuzzy monitoring system and visual monitoring system, and uses multiple monitoring methods to measure the coal flow rate, and gradually converges to determine the coal flow value M, and quickly adjusts the belt speed V close to V exp , and then gradually adjust V dynamically to fit a more precise V st and V s , reducing the impact of coal flow measurement errors and low measurement timeliness, effectively improving regulation efficiency and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0026] Figure 1 It is the overall structural diagram of the coal flow monitoring and control system;

[0027] Figure 2 It is a schematic diagram of the energy-saving control system of the coal flow monitoring and control system;

[0028] Figure 3 A schematic diagram of a coal flow monitoring system for a coal flow monitoring and control system;

[0029] Figure 4 It is a schematic diagram of energy-saving control flow of coal flow monitoring and control method;

[0030] In the figure: 1. Belt conveyor; 2. Collection component 1; 3. Collection component 2; 4. Bracket; 5. Collection component 3; 6. Controller; 7. Centralized controller. DETAILED DESCRIPTION

[0031] See also Figure 1-Figure 4 In an embodiment of the present application, a coal flow monitoring and control method is provided, which uses a coal flow monitoring and control system, and the coal flow monitoring and control system includes:

[0032] A belt conveyor 1, on which a belt is provided, and the belt is driven by an electric motor with a frequency converter;

[0033] A collection component 2 is fixedly arranged on the belt conveyor 1, and the collection component 2 is composed of a weighing roller, a speed sensor, and a signal processing system;

[0034] The collecting components 2 3 are fixedly arranged on the belt conveyor 1, and the collecting components 2 3 are symmetrically arranged in two groups, and the two groups of collecting components 2 3 are distributed on both sides of the belt conveyor 1;

[0035] A collecting component 3 5 is placed above the belt conveyor 1 through a bracket 4;

[0036] The collection component 1 2 , the collection component 2 3 , and the collection component 3 5 are sequentially arranged in the transmission direction of the belt conveyor 1 , and a controller 6 and a centralized controller 7 are also arranged on the belt conveyor 1 .

[0037] As a preferred embodiment, the collection component 2 measures the coal flow value M through the weighing roller. p The belt transmission speed V is obtained by the speed sensor, and M is converted into p and V are transmitted to the centralized controller 7.

[0038] As a preferred embodiment, the acquisition component 2 3 includes a high-definition camera and a signal transmitter, wherein the high-definition camera collects the image signal of the coal body passing on the belt, and transmits it to the centralized controller 7 through the signal transmitter, and the image is analyzed and calculated in the centralized controller 7 to collect the key points of the coal flow section, estimate the coal flow section, and thereby obtain the instantaneous coal flow M st , and calculate the corresponding expected belt speed V st .

[0039] As a preferred embodiment, the acquisition component 3 5 includes a laser transmitter, a high-definition camera and a signal transmitter. The laser is projected onto the surface of the conveyor belt by the laser transmitter to form highlight stripes. The image information containing the highlight stripes is collected by the high-definition camera and transmitted to the centralized controller 7 through the signal transmitter. The image is analyzed and calculated in the centralized controller 7 to collect the accurate contour line of the coal flow section, and the coal flow section is calculated to obtain the instantaneous coal flow M. s , and calculate the corresponding expected belt speed V s .

[0040] It should be explained that the instantaneous coal flow M obtained based on machine vision s The error with the actual instantaneous coal flow M is within 10%, so the fuzzy monitoring is performed through the acquisition component 23 to determine M st As a transition.

[0041] It needs to be explained that due to the harsh operating environment, poor lighting conditions and high dust concentration in the air of the belt conveyor 1, the images obtained by the acquisition component 2 3 and the acquisition component 3 5 have serious noise interference, poor contrast and other problems. Usually, the image edge information is enhanced based on the image grayscale characteristics to segment the coal flow and the conveyor belt; thereby improving accuracy, but the corresponding processing speed is affected and lags are generated.

[0042] As a preferred embodiment, the control signal is converted by the centralized controller 7 and the controller 6 and transmitted to the frequency converter to adjust the motor.

[0043] As a preferred embodiment, the instantaneous coal flow M is classified into grades M n , the difference in level division is 30%; take M 0 、M 1 、M 2 ...; and correspondingly divide the expected belt speed V expn , belt scale obtains coal flow M p The error between the actual coal flow rate and the actual coal flow rate is within 20%, so dividing and taking values ​​according to the 30% difference can reduce the impact of the error.

[0044] A coal flow monitoring and control method, comprising:

[0045] Ⅰ. M measured by p Determine the appropriate M n , adjust the belt speed V to the corresponding desired belt speed V expn ;

[0046] Ⅱ. If the measured M p The corresponding M n The value does not change, wait and follow the measured M st , the corresponding V st In Vexpn-1 and V expn+1 If V is between V st ;

[0047] III. Wait and follow the measured M s , the corresponding V s In V expn-1 and V expn+1 If V is between V s .

[0048] As a preferred embodiment, V st and V s In the presence of both, V s Priority over V st .

[0049] As a preferred embodiment, V st and V s Not in V expn-1 and V expn+1 If V is between 1 and 2, no adjustment is made.

[0050] As a preferred embodiment, the measured M p The corresponding M n If the value changes, the belt speed V is changed to the corresponding expected belt speed V. expn .

[0051] It needs to be explained that the belt scale's judgment value is inaccurate, but the judgment speed is fast. The laser measurement accuracy value is relatively high, but the external environment corresponding to data collection is complex, and the accuracy of the corresponding processing results is positively correlated with the processing time. During the collection process, the coal flow rate changes in real time. Only relying on laser measurement to determine the coal flow rate and then controlling the transmission speed has serious lag, and its monitoring error also exists and cannot be avoided;

[0052] Therefore, this application uses a belt scale monitoring system, a fuzzy monitoring system, and a visual monitoring system to measure the coal flow rate in a variety of monitoring ways, and gradually converges to determine the coal flow rate value M, and quickly adjusts the belt speed V close to V exp , and then gradually adjust V dynamically to fit a more precise V st and V s , reduce the impact of coal flow measurement errors and low measurement timeliness, effectively improve regulation efficiency and reduce energy consumption.

[0053] What has been described above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and application concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. A coal flow monitoring and control method, characterized in that: It uses a coal flow monitoring and control system, which includes: A belt conveyor (1) having a belt disposed thereon, wherein the belt is driven by an electric motor with a frequency converter; A collection component 1 (2) is fixedly arranged on the belt conveyor (1), and the collection component 1 (2) is composed of a weighing roller, a speed sensor, and a signal processing system; A second collecting component (3) is fixedly mounted on the belt conveyor (1), and the second collecting component (3) is symmetrically arranged in two groups, and the two groups of the second collecting components (3) are distributed on both sides of the belt conveyor (1); A collecting component three (5) is placed above the belt conveyor (1) via a bracket (4); The collection component 1 (2), the collection component 2 (3), and the collection component 3 (5) are arranged in sequence in the transmission direction of the belt conveyor (1), and the belt conveyor (1) is also provided with a controller (6) and a centralized controller (7); The acquisition component 2 (3) includes a high-definition camera and a signal transmitter, wherein the high-definition camera collects the image signal of the coal body passing on the belt and transmits it to the centralized controller (7) through the signal transmitter, and the centralized controller (7) analyzes and calculates the image to collect the key points of the coal flow cross section, estimates the coal flow cross section, and thereby obtains the instantaneous coal flow M. st , and calculate the corresponding expected belt speed V st ; The acquisition component three (5) includes a laser transmitter, a high-definition camera and a signal transmitter. The laser transmitter projects laser light onto the surface of the conveyor belt to form highlight stripes. The high-definition camera collects image information containing highlight stripes and transmits it to the centralized controller (7) through the signal transmitter. The centralized controller (7) analyzes and calculates the image to collect the accurate contour line of the coal flow section, calculates the coal flow section, and thereby obtains the instantaneous coal flow M. s , and calculate the corresponding expected belt speed V s ; The collecting component 1 (2) measures the coal flow value M through the weighing roller p The belt transmission speed V is obtained by the speed sensor, and M is converted into p and V are transmitted to the centralized controller (7); The control signal is converted by the centralized controller (7) and the controller (6) and transmitted to the frequency converter to adjust the motor; Classify the instantaneous coal flow M n , the difference of grade division is 30%; take M0, M1, M2...; and divide the expected belt speed V accordingly expn ; The coal flow monitoring and control method comprises the following steps: Ⅰ. M measured by p Determine the appropriate M n , adjust the belt speed V to the corresponding desired belt speed V expn ; Ⅱ. If the measured M p The corresponding M n The value does not change, wait and follow the measured M st , the corresponding V st In V expn-1 and V expn+1 If V is between V st ; III. Wait and follow the measured M s , the corresponding V s In V expn-1 and V expn+1 If V is between V s .

2. A coal flow monitoring and control method according to claim 1, characterized in that: Where V st and V s In the presence of both, V s Priority over V st .

3. A coal flow monitoring and control method according to claim 2, characterized in that: V st and V s Not in V expn-1 and V expn+1 If V is between 1 and 2, no adjustment is made.

4. A coal flow monitoring and control method according to claim 3, characterized in that: Determination of M p The corresponding M n If the value changes, the belt speed V is changed to the corresponding expected belt speed V. expn .

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