Foreign matter detection device and detection method for roller of coal conveying belt conveyor

Abstract

The invention relates to a foreign matter detection device and a detection method for a roller of a coal belt conveyor, and the foreign matter detection device comprises a gamma-ray densimeter and a microprocessor connected with the gamma-ray densimeter, and the gamma-ray densimeter is installed on a support of the roller of the coal belt conveyor. The gamma ray densimeter is used for emitting gamma rays to coal on a conveying belt in a roller to calculate the density and sending the density to the microprocessor, and the microprocessor is used for receiving the density, comparing the density with a preset coal density range and judging whether foreign matters exist on the conveying belt or not. Compared with the prior art, the method has the advantages of simple principle, low cost, safety, reliability and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of foreign object detection, and particularly to a foreign object detection device and method for a roller of a coal conveying belt conveyor. Background Art

[0002] The roller is an important part of the belt conveyor. The belt winds around the main roller and the tail redirecting roller to form an endless belt, providing a closed running path for the coal conveying belt conveyor, enabling the belt to circulate continuously and convey materials such as coal. The tail roller installed on the coal conveying belt conveyor contacts the surface of the tail roller when the belt runs to the tail. Through its own structure and fixed position, the roller guides the belt to change direction, enabling the belt to turn from a horizontal or inclined conveying direction to a return path, thus realizing the circular movement of the belt.

[0003] Currently, workers need to regularly inspect, maintain and clean the conveyor belt and the roller. The tail roller and the nearby conveyor belt are cleaned during downtime. However, sometimes due to the negligence of the cleaning personnel, large debris such as shovels may enter the roller, bringing various hidden dangers to the belt, such as belt tearing, surface damage, and roller deformation, increasing the safety hazards of the coal conveying system. Therefore, it is urgent to detect debris to improve the safety and service life. Summary of the Invention

[0004] The purpose of the present invention is to provide a foreign object detection device and method for a roller of a coal conveying belt conveyor, which can improve the safety and reliability of the coal conveying process.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A foreign object detection device for a roller of a coal conveying belt conveyor includes a gamma ray densitometer and a microprocessor connected thereto. The gamma ray densitometer is installed on the bracket of the roller of the coal conveying belt conveyor. The gamma ray densitometer is used to emit gamma rays to the coal on the conveyor belt inside the roller, calculate the density and send it to the microprocessor. The microprocessor is used to receive the density and compare it with a preset coal density range to determine whether there is a foreign object on the conveyor belt.

[0007] Further, the gamma ray densitometer includes a transmitter, a receiver and an electrical unit. The transmitter is used to emit gamma rays and pass through the coal on the conveyor belt. The receiver is connected to the transmitter and is used to receive the gamma rays after passing through the coal. The electrical unit is connected to the receiver and is used to convert the gamma rays after passing through the coal into an electrical signal and calculate the corresponding density.

[0008] Further, the transmitter and the receiver are symmetrically arranged on the bracket of the roller of the coal conveying belt conveyor on both sides of the conveyor belt.

[0009] Further, the energy range of the gamma rays is 300 keV - 1.25 MeV, and the spatial resolution of the receiver ranges from 0.2 mm to 1.0 mm.

[0010] Further, a plurality of the gamma ray densitometers are provided.

[0011] Further, the gamma ray densitometer is connected to the microprocessor through a 485 communication cable.

[0012] Further, the gamma ray densitometer adopts the HZ-5300 series microcomputer type gamma ray densitometer.

[0013] Further, an alarm is further included, and the alarm is connected to the microprocessor and is used to send an alarm message when a foreign object is detected.

[0014] Further, the preset coal density range is 1.3 - 1.8 g / cm 3 。

[0015] The present invention also provides a detection method for the foreign object detection device for the roller of the coal conveyor belt according to the above, including the following steps:

[0016] The emitter emits gamma rays and passes through the coal on the conveyor belt;

[0017] The receiver receives the gamma rays after passing through the coal;

[0018] The electrical unit converts the gamma rays after passing through the coal into electrical signals and calculates the corresponding density;

[0019] The microprocessor receives the density and compares it with the preset coal density range. If the calculated density is within the coal density range, it means that no foreign object is detected; otherwise, it indicates that a foreign object is detected, and an alarm message is sent through the alarm.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention utilizes the difference in density between coal and foreign objects, calculates the density after passing through the coal through a gamma ray densitometer, and compares it with the normal range of coal density through a microprocessor, so as to detect whether there is a foreign object, thereby improving the safety and reliability of the coal transportation process.

[0022] (2) The working principle of the present invention is simple, the structure is simple, it is easy to arrange, and the cost is low.

[0023] (3) The present invention can detect smaller and smaller foreign objects and improve the detection accuracy. Description of the Drawings

[0024] Figure 1Schematic diagram of the structure of the present invention;

[0025] Figure 2 Schematic diagram of the roller of the coal conveyor belt of the present invention;

[0026] In the figure: 1. γ-ray densitometer, 11. Transmitter, 12. Receiver, 13. Electrical unit; 2. Microprocessor; 3. Conveyor belt; 4. Alarm; 5. Coal; 6: Transmission shaft. Specific embodiments

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and gives the detailed implementation manner and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, and only represent different instances referring to the same object, rather than implying that the objects described in this way must be in a given order, whether in time, space, sorting or any other way.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] This embodiment provides a foreign object detection device for the roller of a coal conveyor belt. The device is designed by using the different densities of coal and other foreign objects to detect foreign objects in the coal 5 in the roller of the coal conveyor belt.

[0031] As Figure 1 shown, the device includes a γ-ray densitometer 1, a microprocessor 2 and an alarm 4 connected in sequence.

[0032] As Figure 2 shown in the existing structure of the roller of the coal conveyor belt, the conveyor belt 3 in the roller conveys coal 5 under the driving action of the transmission shaft 61.

[0033] In this embodiment, the gamma ray densitometer 1 includes a transmitter 11, a receiver 12 and an electrical unit 13. The transmitter 11 and the receiver 12 are symmetrically arranged on the brackets of the coal conveyor belt rollers on both sides of the conveyor belt 3. The receiver 12 is connected to the electrical unit 13. The transmitter 11 is used to emit gamma rays towards the coal 5 being transported on the conveyor belt 3 and pass through the coal 5 on the conveyor belt 3. Since the intensity of the gamma rays will attenuate due to absorption by the material when passing through the coal 5 and foreign objects in the coal 5, and the attenuation degree is related to the material density, the intensity of the remaining gamma rays received by the receiver 12 is also different due to contact with different materials. The electrical unit 13 converts the remaining gamma rays of different intensities into electrical signals of different signal intensities, and then establishes an association with the material density to calculate the corresponding density.

[0034] To facilitate the gamma ray densitometer 1 to have better detection accuracy, in this embodiment, the energy range of the gamma rays is set between 300 keV and 1.25 MeV, and the spatial resolution range of the receiver 12 is set between 0.2 mm and 1.0 mm to detect both smaller and larger foreign objects in the coal 5.

[0035] This embodiment uses the HZ-5300 series microcomputer gamma ray densitometer, which has a data transmission function. The electrical unit 13 can be connected to the microprocessor 2 through a 485 communication cable to transmit the calculated density to the microprocessor 2. The density transmitted to the microprocessor 2 has a pre-built coal density range of 1.3 - 1.8 g / cm 3 , and the microprocessor 2 matches the received density with the preset coal density range. If the match is successful, it means it is within the preset range, indicating that no foreign object is detected. If the match is not successful, it means it is not within the preset range, indicating that a foreign object is detected. The microprocessor 2 sends a control instruction to the alarm 4, causing the alarm 4 to send an alarm message to prompt the staff to stop the machine for inspection.

[0036] In this embodiment, multiple gamma ray densitometers 1 can be set to prevent missed detection during high-speed transportation.

[0037] According to the design of the above device, the execution steps of the device include:

[0038] The transmitter 11 emits gamma rays and passes through the coal 5 on the conveyor belt 3;

[0039] The receiver 12 receives the gamma rays after passing through the coal 5;

[0040] The electrical unit 13 converts the gamma rays after passing through the coal 5 into electrical signals and calculates the corresponding density;

[0041] The microprocessor 2 receives the density and compares it with a preset coal density range. If the calculated density is within the coal density range, it indicates that no foreign object is detected; otherwise, it indicates that a foreign object is detected, and an alarm message is sent through the alarm 4.

[0042] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0043] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A foreign object detection device for a coal conveyor belt roller, characterized in that, It includes a gamma ray densitometer (1) and a microprocessor (2) connected thereto. The gamma ray densitometer (1) is installed on the bracket of the roller of the coal conveyor belt. The gamma ray densitometer (1) is used to emit gamma rays to the coal (5) on the conveyor belt (3) inside the roller, calculate the density and send it to the microprocessor (2). The microprocessor (2) is used to receive the density and compare it with a preset coal density range to determine whether there is a foreign object on the conveyor belt (3).

2. The foreign object detection device for the roller of a coal conveying belt conveyor according to claim 1, characterized in that, The gamma ray densitometer (1) includes a transmitter (11), a receiver (12) and an electrical unit (13). The transmitter (11) is used to emit gamma rays and pass through the coal (5) on the conveyor belt (3). The receiver (12) is connected to the transmitter (11) and is used to receive the gamma rays after passing through the coal (5). The electrical unit (13) is connected to the receiver (12) and is used to convert the gamma rays after passing through the coal (5) into electrical signals and calculate the corresponding density.

3. The foreign object detection device for a coal conveyor belt roller according to claim 2, characterized in that, The transmitter (11) and the receiver (12) are symmetrically arranged on the brackets of the rollers of the coal conveyor belt on both sides of the conveyor belt (3).

4. The foreign object detection device for the roller of the coal conveying belt machine according to claim 3, characterized in that, The energy range of the gamma rays is 300 keV - 1.25 MeV, and the range of the spatial resolution of the receiver (12) is 0.2 mm - 1.0 mm.

5. The foreign object detection device for the roller of a coal conveying belt conveyor according to claim 1, characterized in that, A plurality of the gamma ray densitometers (1) are provided.

6. The foreign object detection device for a coal conveyor belt roller according to claim 1, characterized in that, The gamma ray densitometer (1) is connected to the microprocessor (2) through a 485 communication cable.

7. The foreign object detection device for a coal conveyor belt roller according to claim 1, characterized in that, The gamma ray densitometer (1) adopts the HZ-5300 series microcomputer type gamma ray densitometer.

8. The foreign object detection device for a coal conveyor belt roller according to claim 1, characterized in that, It further includes an alarm (4). The alarm (4) is connected to the microprocessor (2) and is used to send an alarm message when detecting a foreign object.

9. The foreign object detection device for a coal conveyor belt roller according to claim 1, characterized in that, The preset coal density range is 1.3 - 1.8 g / cm 3 .

10. A detection method for a foreign object detection device for a coal conveyor belt roller according to any one of claims 1-9, characterized in that, It includes the following steps: The transmitter (11) emits gamma rays and passes through the coal (5) on the conveyor belt (3); The receiver (12) receives the gamma rays after passing through the coal (5); The electrical unit (13) converts the gamma rays after passing through the coal (5) into electrical signals and calculates the corresponding density; The microprocessor (2) receives the density and compares it with a preset coal density range. If the calculated density is within the coal density range, it means that no foreign object is detected. Otherwise, it indicates that a foreign object is detected, and an alarm message is sent through the alarm (4).

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