Intelligent belt flow monitoring system

Abstract

The utility model belongs to the technical field of non-contact measurement, and particularly relates to an intelligent belt flow monitoring system which comprises a supporting beam, a support, a control unit and an upper computer, the supporting beam is in a U shape, the support is located below the supporting beam, a conveying roller is assembled on the top of the support, a conveying belt is assembled on the upper side of the conveying roller, and the control unit is connected with the upper computer. A laser scanner is installed on the top of the supporting beam and located on the upper side of the conveying belt, an exemption type radioactive densimeter is installed on the top of the supporting beam and located on one side of the laser scanner, a densimeter receiver is installed on the support and located on the lower side of the conveying belt, and a speed sensor is installed on the side wall of the support and located on one side of the densimeter receiver. According to the utility model, real-time measurement of information such as the coal passing amount, the coal passing volume and the coal passing density of the belt conveyor can be realized, the maintenance workload is small, and the measurement precision is high.

Description

Technical Field

[0001] The utility model belongs to the field of non-contact measurement, and specifically relates to an intelligent belt flow monitoring system. Background Art

[0002] Belt flow monitoring is a technology used to measure and monitor the flow of materials transported by conveyor belts. It is typically based on a variety of principles and technologies, including load cells and speed sensors. Commonly used weight monitoring devices include electronic belt scales, nuclear scales, and laser scales.

[0003] However, the monitoring accuracy of electronic belt scales is easily affected by many factors, such as ambient temperature and humidity, mechanical equipment vibration, conveyor belt inclination, material viscosity and other factors; nuclear scales have low measurement accuracy, and require a lot of maintenance in the later stage, and the equipment investment cost is high, which is not conducive to long-term use; and laser scales have difficulty in collecting materials accumulated on the conveyor belt evenly, which makes the collected data fluctuate greatly and leads to inaccurate measurement problems. Utility Model Content

[0004] The purpose of this utility model is to provide an intelligent belt flow monitoring system, which can realize the real-time measurement of information such as the coal flow rate, coal volume, and coal density of the belt conveyor with less maintenance workload.

[0005] The technical solutions adopted in this application are as follows:

[0006] An intelligent belt flow monitoring system includes a support beam, a bracket, a control unit and a host computer. The support beam is U-shaped, the bracket is located below the support beam, a conveyor roller is installed on the top of the bracket, a conveyor belt is installed on the upper side of the conveyor roller, a laser scanner is installed on the top of the support beam on the upper side of the conveyor belt, an exempted radioactive densitometer is installed on the top of the support beam on the side of the laser scanner, a density meter receiver is installed on the bracket on the lower side of the conveyor belt, and a speed sensor is installed on the side wall of the bracket on the side of the density meter receiver.

[0007] The control unit includes a main control circuit board with a display screen, a switch and a power supply.

[0008] The host computer is connected to the control unit for synchronization and data exchange.

[0009] The laser scanner, the exempted radioactive density meter and the speed sensor are all connected to the main control circuit board.

[0010] One end of the densitometer receiver is a data processor, and the data processor is connected to the main control circuit board.

[0011] The technical effects achieved by this utility model are:

[0012] This practical intelligent belt flow monitoring system installs multiple sensors on the belt conveyor and adopts a multi-sensor fusion algorithm to realize real-time measurement of information such as the coal flow rate, coal volume, and coal density of the belt conveyor, solving the problem that traditional belt scales need to be calibrated frequently to ensure measurement accuracy and nuclear scale safety management. It also adopts non-contact measurement and multiple quantitative indicators. The system has high sensitivity and long-term stability of measurement parameters, does not require frequent calibration, and has low maintenance workload, saving manpower and material resources. The system is also highly stable and can be used in harsh environments such as large vibration, strong electromagnetic interference, and high dust. The system has a high degree of customization and strong scalability, can be modified according to customer needs, and is simple to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of this practical embodiment;

[0014] Figure 2 This is a schematic diagram of material collection by a laser scanner in this practical embodiment;

[0015] Figure 3 It is a system block diagram of this practical embodiment.

[0016] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0017] 1. Support beam; 2. Bracket; 3. Conveyor roller; 4. Conveyor belt; 5. Laser scanner; 6. Exempt radioactive source; 7. Densitometer receiver; 8. Speed ​​sensor; 9. Control unit; 10. Host computer. DETAILED DESCRIPTION

[0018] In order to make the purpose and advantages of this utility more clear, the utility is described in detail below with reference to the embodiments. It should be understood that the following text is only used to describe one or several specific implementation methods of this utility and does not strictly limit the scope of protection specifically requested by this utility.

[0019] like Figure 1-3 As shown, the intelligent belt flow monitoring system includes a support beam 1, a bracket 2, a control unit 9, and a host computer 10. The control unit 9 includes a main control circuit board with a display screen, a switch, and a power supply. It contains a belt flow meter program and has complete functions such as settings, data display, and statistics. The support beam 1 is U-shaped and can also be replaced with other shapes such as L-shaped and Z-shaped structures according to on-site installation requirements. The bracket 2 is located below the support beam 1. The top of the bracket 2 is equipped with a conveyor roller 3, and the upper side of the conveyor roller 3 is equipped with a conveyor belt 4. A laser scanner 5 is installed on the top of the support beam 1 above the conveyor belt 4. An exempted radioactive source 6 is installed on the top of the support beam 1 to the side of the laser scanner 5. A density meter receiver 7 is installed on the bracket 2 below the conveyor belt 4. A speed sensor 8 is installed on the side wall of the bracket 2 to the side of the density meter receiver 7.

[0020] Among them, the support beam 1, the bracket 2 and the control unit 9 can be adjusted accordingly according to actual installation requirements, and their structure and installation method are not limited to this solution.

[0021] like Figure 1 As shown, a is the scanning range of the laser scanner 5, and b is the accumulated material. The laser scanner 5 can be used according to the width of the conveyor belt 4, and the scanning range covers the entire material surface without measurement blind spots.

[0022] The host computer 10 is connected to the control unit 9 for synchronization and data exchange.

[0023] The laser scanner 5, the density meter receiver 7 and the speed sensor 8 are all connected to the main control circuit board.

[0024] The speed sensor 8 analyzes the measured data to calculate the instantaneous material flow rate, which is then adjusted to optimize the material flow rate on the conveyor belt 4. A densitometer receiver 7 measures the real-time density of the material on the conveyor belt 4 and, combined with the material volume, calculates the material mass. The control unit 9 further analyzes and calculates the collected data to determine data such as the material's cross-sectional area, belt speed, material volume, and instantaneous flow rate. A host computer 10, connected to the control unit 9 via a communication line, further aggregates and generates 3D images of the material, enabling real-time monitoring. The host computer 10 can also track data based on historical data stored by the host computer 10. Historical material curves can also be viewed.

[0025] One end of the density meter receiver 7 is connected to the main control circuit board.

[0026] The laser scanner 5 calculates the distance of the target object by using the time it takes for the laser beam to be emitted to the target object and reflected back. Then, by scanning the surface of the target object, the cross-sectional area of ​​the target object can be obtained, and the volume data of the target object can be calculated based on the speed.

[0027] The exempted radiation source emits gamma rays, which pass through the belt and the measured medium. As the density of the medium changes, the intensity of the radiation received by the receiver also changes. The receiver transmits the radiation intensity signal to the main control circuit board, which calculates the corresponding density value.

[0028] The measurement principle of the speed sensor 8 is: when the measured belt moves, it drives the existing roller to rotate. The diameter of the roller is known. By measuring the number of times (or angle) the roller rotates per unit time, the speed of the object can be calculated. The speed sensor 8 is based on the Hall effect principle (non-contact), that is, the Hall element senses the raised teeth or recessed grooves on the magnetic conductor, and converts it into an analog 4-20mA or communication RS485 output, outputting the number of rotations or angles, thereby achieving non-contact measurement. The magnetic conductor here refers to the roller. If the roller does not have raised teeth or recessed grooves, a magnetic sheet can be fixed on the roller. The specific process of Hall effect to signal conversion is as follows:

[0029] Hall Effect: When current flows through a conductor in a magnetic field, the magnetic field exerts a force on the charges in the conductor, causing them to accumulate on both sides of the conductor, resulting in a potential difference. This phenomenon is known as the Hall Effect. Hall elements are sensors made based on this principle.

[0030] Induction process: In a Hall effect sensor, a Hall element is installed inside the sensor. When a magnetic conductor (such as iron or a magnet) on the object being measured (such as a gear, a bump, or a depression) rotates with the object being measured, the raised or depressed parts of the conductor periodically approach and move away from the Hall effect element. During this process, the changes in the magnetic field are sensed by the Hall effect element.

[0031] Signal conversion: When the Hall element senses changes in the magnetic field, it generates corresponding electrical signals. These electrical signals are processed by the precision circuit inside the sensor and converted into analog signals (such as 4-20mA) or communication signals (such as RS485).

[0032] Specifically, the volume calculation formula is:

[0033]

[0034] Where v represents the speed, unit: m / s; S represents the cross-sectional area of ​​the empty belt, unit: m 2 ;S n Represents the cross-sectional area of ​​the nth scan, unit: m 2 ; In this system, N is 200, that is, it scans 200 times per second and obtains the cross-sectional area 200 times; S-Sn is used to calculate the cross-sectional area of ​​the material.

[0035] like Figure 2 As shown: S is the sector area of ​​the unloaded conveyor belt, S n is the sector area of ​​the loaded conveyor belt. S-Sn calculates the cross-sectional area of ​​the material;

[0036] V is the volume obtained per second, unit: m 3, that is, the cross-sectional area is measured N times per second and the average is multiplied by the velocity v to obtain the volume. In this system, N times is 200 times, and the lidar scans 200 times per second.

[0037] The density calculation formula is:

[0038] ρ=ln(I0 / I) / (μd)

[0039] Where ln is the logarithm with constant e as base; I0 is the intensity of the ray after passing through the empty belt; I is the intensity of the ray after penetrating the material; μ is the mass absorption coefficient of the material to γ ​​rays (cm 2 / g); d is the material thickness in the ray direction (cm); ρ is the material density (g / cm 3 ).

[0040] Mass calculation formula:

[0041] M=PV

[0042] Where P represents density, unit is kg / m 3 , the unit conversion is based on the density ρ to obtain kg / m 3 ; V represents volume, unit is m 3 ; M represents mass, unit is kg.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this application shall be implemented in accordance with conventional means in the art unless otherwise specified or limited.

Claims

1. Intelligent belt flow monitoring system, characterized by: The invention comprises a support beam (1), a bracket (2), a control unit (9) and a host computer (10), wherein the support beam (1) is U-shaped, the bracket (2) is located below the support beam (1), a conveying roller (3) is mounted on the top of the bracket (2), a conveying belt (4) is mounted on the upper side of the conveying roller (3), a laser scanner (5) is mounted on the top of the support beam (1) located on the upper side of the conveying belt (4), an exempted radioactive source (6) is mounted on the top of the support beam (1) located on one side of the laser scanner (5), a density meter receiver (7) is mounted on the bracket (2) located below the conveying belt (4), and a speed sensor (8) is mounted on the side wall of the bracket (2) located on one side of the density meter receiver (7).

2. The intelligent belt flow monitoring system according to claim 1, characterized in that: The control unit (9) comprises a main control circuit board with a display screen, a switch and a power supply.

3. The intelligent belt flow monitoring system according to claim 1, characterized in that: The host computer (10) is connected to the control unit (9) for synchronization and data exchange.

4. The intelligent belt flow monitoring system according to claim 2, characterized in that: The laser scanner (5), the exempted radioactive density meter (6) and the speed sensor (8) are all connected to the main control circuit board.

5. The intelligent belt flow monitoring system according to claim 2, characterized in that: One end of the densitometer receiver (7) is a data processor, and the data processor is connected to a main control circuit board.

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