Coal preparation plant scraper chain fault alarm device and alarm method

Abstract

The invention provides a coal preparation plant scraper chain fault alarm device, and relates to the technical field of coal equipment, the coal preparation plant scraper chain fault alarm device comprises two sensing elements, a signal processing unit, an alarm module and a control module, and the sensing elements adopt proximity switches and are installed through a non-magnetic material substrate transversely arranged above a scraper transmission chain. The signal processing unit is electrically connected with the sensing element, the alarm module and the control module. The alarm module comprises a diode bulb, and the control module is electrically connected with a motor of the scraper. In addition, the device is also provided with a communication module for communicating with an external system, and a power supply for supplying power to each module through a wiring terminal. The time difference between the two ends of the scraper and the sensing area is accurately captured, data analysis is conducted through the signal processing unit, early detection and alarm of the chain mistake phenomenon of the scraper are achieved, negative effects caused by chain mistake are effectively avoided or relieved, and production efficiency and safety are improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal equipment, and in particular to a chain error alarm device for a scraper conveyor in a coal preparation plant. Background Art

[0002] During the washing process of the coal preparation plant, clean coal and medium coal slime usually fall into the corresponding scraper through the filter press discharge trough, and then are transported to the transfer belt by the scraper, and finally transported to the designated location by the transfer belt. Since the clean coal cake after the filter press discharge has a high viscosity, if it falls directly on the belt conveyor, there is a problem that the discharge is too large and easily exceeds the belt width range. Therefore, in order to ensure the effective transportation of materials, chain scrapers are generally used for transportation. Chain scrapers are usually installed in a box to protect the internal structure from the influence of the external environment.

[0003] When conveying materials, the traditional box-type scraper conveyor may be misaligned at any time, but since the scraper conveyor is usually in a closed state, it is difficult to monitor the misalignment in real time. Once misalignment occurs but is not discovered in time, the drive motor will stop, and the filter press will continue to discharge materials, causing the material in the discharge chute to be blocked. At this time, manual entry into the wet and closed space is required for cleaning, which increases the labor intensity and operation risks of workers, and also seriously affects production efficiency.

[0004] When the scraper conveyor is mis-linked, the load on the drive motor will increase, causing the current of the drive motor to increase. Traditional overload protection methods usually rely on the tripping of thermal relays or the action of motor protectors to determine whether a mis-link has occurred. For the tripping of thermal relays, not only is the reaction delayed, but it may also cause frequent tripping or damage to the motor; for the motor protector of the scraper conveyor, if the current protection value is set too small, it is easy to cause frequent tripping due to the unloading of the filter press cake; conversely, if the setting value is too large, it may cause the motor to overheat or even burn out. Summary of the invention

[0005] The purpose of the present invention is to provide a chain misalignment alarm device for a scraper conveyor in a coal preparation plant. Two electronic sensing systems are installed on the scraper conveyor. The time difference between the two ends of the scraper reaching the sensing area is detected, and the signal processing unit is used for analysis to achieve early detection and alarm of chain misalignment. Early detection and alarm of chain misalignment in the scraper conveyor can be achieved, thereby avoiding or reducing the negative impact of chain misalignment and improving production efficiency and safety.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A chain misalignment alarm device for a scraper conveyor in a coal preparation plant, comprising two sensing elements, a signal processing unit, an alarm module and a control module;

[0008] The signal processing unit is electrically connected to the sensing element, the alarm module, and the control module respectively;

[0009] The sensing element is arranged between the transmission chains and close to the transmission chains. The two sensing elements are sensing element 1 and sensing element 2. The sensing element 1 and sensing element 2 are arranged on both sides of the scraper respectively. The connection line between the sensing element 1 and the sensing element 2 is perpendicular to the transmission direction of the scraper.

[0010] The control module is electrically connected to the motor of the scraper;

[0011] The alarm module includes a diode bulb.

[0012] Furthermore, the sensing element is a proximity switch.

[0013] Furthermore, the signal processing unit is a PLC detection system.

[0014] Furthermore, the sensing element is installed through a base plate placed horizontally above the drive chain of the scraper conveyor, and the base plate is made of non-magnetic material, which can avoid interference of magnetic materials on the sensing element.

[0015] Furthermore, the material of the substrate is specifically polyurethane material.

[0016] Furthermore, the sensing element, the signal processing unit, the alarm module, and the control module are all connected to the communication module.

[0017] Furthermore, the communication module is an RS485 communication module.

[0018] Furthermore, it also includes a power supply, and the sensing element, the signal processing unit, the alarm module, the control module, and the communication module are all connected to the power supply through wiring terminals.

[0019] The present invention also provides a method for alarming a chain misalignment of a scraper conveyor in a coal preparation plant, which is applied to the above-mentioned alarming device for alarming a chain misalignment of a scraper conveyor in a coal preparation plant, and comprises the following steps:

[0020] S1: The sensing element detects the scraper of the scraper conveyor. When the scraper passes through the sensing element, the sensing element transmits the signal to the signal processing unit;

[0021] S2: The signal processing unit determines the operating status of the transmission chains on both sides of the scraper according to the time interval between the signals sent by the sensing element 1 and the sensing element 2;

[0022] S3: If the signal processing unit determines that the transmission chains on both sides of the scraper are misaligned, the signal processing unit sends an alarm signal to the alarm module, and sends a control signal to the control module to shut down the scraper motor.

[0023] Further: in step S2, the time interval threshold for sending signals between the sensing element 1 and the sensing element 2 is set to 150 milliseconds to 300 milliseconds. When the time interval is greater than the threshold, it is determined that the scraper has misaligned.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention can accurately capture the time difference between the two ends of the scraper reaching the sensing area through the two sensing elements installed on the scraper, and then perform data analysis through the signal processing unit to achieve early detection and alarm of the scraper misalignment phenomenon, effectively avoiding or reducing the negative impact of misalignment.

[0026] Second, the present invention can realize early detection and alarm, reduce equipment downtime and manual cleaning time caused by wrong chain, and significantly improve production efficiency.

[0027] 3. Timely alarm and automatic shutdown control can effectively reduce mechanical injury accidents caused by chain errors and ensure the personal safety of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a chain misalignment alarm device for a scraper conveyor in a coal preparation plant in one embodiment;

[0029] Figure 2 It is a schematic diagram of the installation and connection of a chain error alarm device for a scraper conveyor of a coal preparation plant on a scraper conveyor in one embodiment;

[0030] In the figure:

[0031] 1. Base plate; 2. Sensing element 1; 3. Scraper; 4. Transmission chain; 5. Scraper; 6. Sensing element 2. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] A chain misalignment alarm device for a scraper conveyor in a coal preparation plant, comprising two sensing elements, a signal processing unit, an alarm module and a control module;

[0035] The signal processing unit is electrically connected to the sensing element, the alarm module, and the control module respectively;

[0036] The sensing element is arranged between the transmission chains 4 and close to the transmission chains 4. The two sensing elements are sensing element 1 2 and sensing element 2 6. The sensing element 1 2 and sensing element 2 6 are arranged on both sides of the scraper 5 respectively. The connection line between the sensing element 1 2 and sensing element 2 6 is perpendicular to the transmission direction of the scraper 5. The distance between the sensing element 1 2 and the sensing element 2 6 and the same scraper 3 on the scraper 5 is the same.

[0037] The control module is electrically connected to the motor of the scraper 5;

[0038] The alarm module includes a diode bulb.

[0039] In some embodiments, the sensing element is a proximity switch.

[0040] In some embodiments, the signal processing unit is a PLC detection system.

[0041] In some embodiments, the sensing element is installed through a substrate 1 placed horizontally above the transmission chain 4 of the scraper 5, and the material of the substrate 1 is a non-magnetic material.

[0042] In one embodiment, the material of the substrate 1 is specifically polyurethane material.

[0043] In some embodiments, the sensing element, the signal processing unit, the alarm module, and the control module are all connected to the communication module.

[0044] In one embodiment, the communication module is an RS485 communication module.

[0045] In another embodiment, a power supply is also included, and the sensing element, the signal processing unit, the alarm module, the control module, and the communication module are all connected to the power supply through wiring terminals.

[0046] In another embodiment, the present invention further provides a method for alarming a chain misalignment of a scraper conveyor in a coal preparation plant, which is applied to the above-mentioned alarming device for alarming a chain misalignment of a scraper conveyor in a coal preparation plant, and comprises the following steps:

[0047] S1: The sensing element detects the scraper 3 of the scraper 5. When the scraper 3 passes through the sensing element, the sensing element transmits a signal to the signal processing unit;

[0048] S2: The signal processing unit determines the operating status of the transmission chains 4 on both sides of the scraper 5 according to the time interval of sending signals between the sensing element 1 2 and the sensing element 2 6; the time interval threshold of sending signals between the sensing element 1 2 and the sensing element 2 6 is set to 150 milliseconds-300 milliseconds. In this embodiment, the preferred threshold is 250 milliseconds; when the time interval is greater than the threshold, it is determined that the scraper 5 has a chain misalignment.

[0049] S3: If the signal processing unit determines that the transmission chains 4 on both sides of the scraper 5 are misaligned, the signal processing unit sends an alarm signal to the alarm module and sends a control signal to the control module to shut down the motor of the scraper 5.

[0050] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A chain misalignment alarm device for a scraper conveyor in a coal preparation plant, characterized in that: It includes two sensing elements, a signal processing unit, an alarm module and a control module; The signal processing unit is electrically connected to the sensing element, the alarm module, and the control module respectively; The sensing element is arranged between the transmission chains of the scraper and close to the transmission chains. The two sensing elements are sensing element 1 and sensing element 2. The sensing element 1 and sensing element 2 are arranged on both sides of the scraper respectively. The connection line between the sensing element 1 and the sensing element 2 is perpendicular to the transmission direction of the scraper. The control module is electrically connected to the motor of the scraper.

2. A coal preparation plant scraper chain misalignment alarm device according to claim 1, characterized in that: The sensing element is a proximity switch.

3. A chain misalignment alarm device for a scraper conveyor in a coal preparation plant according to claim 1, characterized in that: The signal processing unit is a PLC detection system; the alarm module includes a diode bulb.

4. A chain misalignment alarm device for a scraper conveyor in a coal preparation plant according to claim 1, characterized in that: The induction element is installed through a base plate which is horizontally placed above the transmission chain of the scraper conveyor, and the material of the base plate is a non-magnetic conductive material.

5. A chain misalignment alarm device for a scraper conveyor in a coal preparation plant according to claim 4, characterized in that: The material of the substrate is specifically polyurethane material.

6. A chain misalignment alarm device for a scraper conveyor in a coal preparation plant according to claim 1, characterized in that: The sensing element, the signal processing unit, the alarm module and the control module are all connected to the communication module.

7. A chain misalignment alarm device for a scraper conveyor in a coal preparation plant according to claim 6, characterized in that: The communication module is an RS485 communication module.

8. A chain misalignment alarm device for a scraper conveyor in a coal preparation plant according to claim 6, characterized in that: It also includes a power supply, and the sensing element, the signal processing unit, the alarm module, the control module, and the communication module are all connected to the power supply through wiring terminals.

9. A method for alarming chain misalignment of a scraper conveyor in a coal preparation plant, characterized in that: A coal preparation plant scraper chain misalignment alarm device applied to any one of claims 1 to 8, comprising the following steps: S1: The sensing element detects the scraper of the scraper conveyor. When the scraper passes through the sensing element, the sensing element transmits the signal to the signal processing unit; S2: The signal processing unit determines the operating status of the transmission chains on both sides of the scraper according to the time interval between the signals sent by the sensing element 1 and the sensing element 2; S3: If the signal processing unit determines that the transmission chains on both sides of the scraper are misaligned, the signal processing unit sends an alarm signal to the alarm module, and sends a control signal to the control module to shut down the scraper motor.

10. A method for alarming chain misalignment of a scraper conveyor in a coal preparation plant according to claim 9, characterized in that: In step S2, a time interval threshold for sending signals between the sensing element 1 and the sensing element 2 is set to 150 milliseconds to 300 milliseconds. When the time interval is greater than the threshold, it is determined that the scraper has misaligned.

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