Remote control system for filter press of coal preparation plant

Abstract

The invention relates to the technical field of coal preparation, in particular to a remote control system for a filter press of a coal preparation plant, which comprises a filter press field control cabinet and a centralized control system, the filter press field control cabinet comprises a touch screen and a field PLC (Programmable Logic Controller), the touch screen is in communication connection with the field PLC, and the centralized control system comprises a lower PLC and an upper industrial computer which are arranged in a control room and are in communication connection with each other; the lower PLC is in communication connection with the field PLC; the system further comprises a black water detection device, the black water detection device comprises an illuminance sensor and an LED illuminating lamp, the illuminance sensor and the LED illuminating lamp are oppositely arranged on the two side faces of the filter press water receiving tank, and the illuminance sensor is electrically connected with the lower PLC. The illumination intensity detected by the illumination sensor is reduced along with the mixing of the clear water into the material, and when the illumination intensity is reduced to an alarm threshold value, the upper industrial computer gives an alarm and sends a shutdown instruction to the field PLC, so that remote monitoring is realized, and high-pressure oil and high-pressure wind are prevented from hurting people.

Description

Technical Field

[0001] The present invention relates to the technical field of coal preparation, in particular to a remote control system for a filter press in a coal preparation plant. Background Art

[0002] During the production process of a coal preparation plant, the filter press is a key piece of equipment used for dehydration. Currently, our company has a total of 10 filter presses used for dehydration of flotation concentrates and flotation tailings. During operation, if the filter cloth of the filter press fails, particulate matter will be discharged along with the filtered water at the damaged position of the filter cloth, producing black water, which affects product quality. Therefore, it is necessary to arrange for dedicated personnel to regularly inspect each filter press to ensure that the filter cloth can be replaced in time when problems occur to avoid affecting product quality. However, manual inspections are time-consuming and labor-intensive, and there is a risk of injury from high-pressure oil and high-pressure air during the pressure maintenance process of the press. Summary of the Invention

[0003] In response to the above problems, an embodiment of the present invention provides a remote control system for a filter press in a coal preparation plant.

[0004] A remote control system for a filter press in a coal preparation plant provided by an embodiment of the present invention includes a filter press on-site control cabinet and a centralized control system; the filter press on-site control cabinet includes a touch screen and an on-site PLC controller, the touch screen and the on-site PLC controller are communicatively connected, the on-site PLC controller is electrically connected to electrical equipment used to ensure normal operation of the filter press, the centralized control system includes a lower-level PLC controller and an upper-level industrial computer arranged in a control room and communicatively connected to each other; the lower-level PLC controller is communicatively connected to the on-site PLC controller; and also includes a black water detection device, the black water detection device includes an illumination sensor and an LED lighting lamp, the illumination sensor and the LED lighting lamp are arranged relative to each other on both side surfaces of the filter press water receiving trough, so that the light beam emitted by the LED lighting lamp passes through the water in the filter press water receiving trough and illuminates the illumination sensor, and the illumination sensor is electrically connected to the lower-level PLC controller.

[0005] Compared with the prior art, the beneficial effect of the present invention is that the alarm threshold can be set based on the light intensity of the LED lighting detected by the illumination sensor when the water in the water receiving tank of the filter press is in a clean state. As materials are mixed into the clean water, the light intensity detected by the illumination sensor will decrease accordingly. When it drops to the alarm threshold, the lower-level PLC controller can determine that black water is generated. At this time, an alarm can be issued through the upper-level industrial computer and a shutdown command can be sent to the on-site PLC controller, thereby realizing remote monitoring, reducing labor costs, and avoiding injuries from high-pressure oil and high-pressure wind.

[0006] Optionally, it also includes a spray sensor, which is arranged on the beams on both sides of the press filter plate, and the spray sensor is electrically connected to the lower PLC controller.

[0007] Optionally, a plurality of spray sensors are provided and evenly distributed on the beam.

[0008] Optionally, the spray sensor adopts a water immersion detection sensor.

[0009] Optionally, a temperature sensor is provided on the filter press feed pump, and the temperature sensor is electrically connected to the lower PLC controller.

[0010] Optionally, it also includes an on-site secondary instrument box, which includes a digital display and an audible and visual alarm; the temperature sensor is electrically connected to the lower-level PLC controller via the digital display, and the digital display is electrically connected to the audible and visual alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the installation position of the black water inspection device in an embodiment of the present invention; Figure 2 Schematic diagram of the installation position of the injection sensor in an embodiment of the present invention.

[0012] Among them, 1. Illumination sensor; 2. Spray sensor; 3. Temperature sensor. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0014] See also Figure 1 and Figure 2An embodiment of the present invention provides a remote control system for a filter press in a coal preparation plant, comprising an on-site control cabinet for the filter press and a centralized control system. The on-site control cabinet for the filter press comprises a touch screen and an on-site PLC controller, which are communicatively connected to the on-site PLC controller. The touch screen can display the working status of electrical equipment in the filter press. The on-site PLC controller is electrically connected to electrical equipment (such as pull plates, hydraulic pumps, valves, etc.) used to ensure normal operation of the filter press. The centralized control system comprises a lower-level PLC controller and an upper-level industrial computer that are arranged in a control room and communicatively connected to each other. The lower-level PLC controller is communicatively connected to the on-site PLC controller. The centralized control system also comprises a black water detection device, which comprises an illumination sensor 1 and an LED lighting lamp. The illumination sensor 1 and the LED lighting lamp are arranged opposite to each other on both sides of a water receiving trough of the filter press at the bottom of the filter press, so that the light beam emitted by the LED lighting lamp passes through the water in the water receiving trough of the filter press and illuminates the illumination sensor 1. The illumination sensor 1 is electrically connected to the lower-level PLC controller.

[0015] During implementation, the light beam emitted by the LED lighting lamp passes through the water in the water tank of the filter press and shines on the illumination sensor 1. The illumination sensor 1 sends the detected light intensity signal to the lower-level PLC controller. The lower-level PLC controller compares the received light intensity signal with the set alarm threshold. When it is determined that the light intensity signal is less than the alarm threshold, an alarm is issued through the upper-level industrial computer, and a shutdown command is sent to the on-site PLC controller. The on-site PLC controller completes the shutdown operation of the filter press.

[0016] Specifically, the alarm threshold can be set based on the light intensity of the LED lighting detected by the illumination sensor 1 when the water in the water tank of the filter press is in a clean state. As materials are mixed into the clean water, the light intensity detected by the illumination sensor will decrease. When it drops to the alarm threshold, the lower-level PLC controller can determine that black water is generated. At this time, an alarm can be issued through the upper-level industrial computer and a shutdown command can be sent to the on-site PLC controller.

[0017] In one implementation, the alarm threshold can be set to multiple levels. For example, in the clear water state, the light intensity is 100, the first-level alarm threshold is set to 80, and the lower-level PLC controller is used to prompt the alarm. The second-level alarm threshold is set to 60, and the lower-level PLC controller is used to prompt the alarm and send a shutdown command to the on-site PLC controller.

[0018] The illumination sensor 1 and the LED lighting are both waterproof. The power of the LED lighting can be selected according to the actual production environment. For example, it can be selected according to the width of the water tank of the filter press. The wider the tank, the greater the wattage. Our company actually uses a 20W LED lighting.

[0019] During implementation, it also includes a spray sensor 2, which is arranged on the beams on both sides of the press filter plate, and the spray sensor 2 is electrically connected to the lower PLC controller; when the filter press sprays, the material is sprayed onto the beams on both sides of the press filter plate and soaks the spray sensor 2. After being soaked, the spray sensor 2 sends a signal to the lower PLC controller, and the lower PLC controller determines that spraying occurs, thereby issuing an alarm through the upper industrial computer.

[0020] There are multiple spray sensors 2, which are evenly distributed on the beam.

[0021] The spray sensor 2 adopts a water immersion detection sensor.

[0022] A temperature sensor 3 is provided on the filter press feed pump, and the temperature sensor 3 is electrically connected to the lower PLC controller; the temperature sensor 3 is used to detect the real-time temperature of the filter press feed pump and send the detected temperature signal to the lower PLC controller. After the lower PLC controller determines that the received temperature signal is higher than the temperature threshold, it determines that the filter press feed pump is overheated. At this time, an alarm is issued through the upper industrial computer, and the filter press feed pump is locked and shut down.

[0023] In a specific implementation, it also includes an on-site secondary instrument box, which includes a digital display and an audible and visual alarm; the temperature sensor 3 is electrically connected to the lower-level PLC controller via the digital display, and the digital display is electrically connected to the audible and visual alarm; the digital display can use a Hongrun digital display to display the temperature data on-site in real time, and send the temperature data to the lower-level PLC controller at the same time. In addition, the digital display also has an alarm output function. When the filter press feed pump overheats, an on-site warning is issued through the audible and visual alarm connected to it.

[0024] The solution provided by the embodiment of the present invention allows operators to monitor the operating conditions of each filter press and its ancillary equipment in real time through a host industrial computer, and adjust operating parameters in real time according to production needs. This not only ensures the continuity of coal washing production, but also eliminates safety hazards during operator operation and improves washing efficiency.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A remote control system for a filter press in a coal preparation plant, comprising a filter press field control cabinet and a centralized control system; the filter press field control cabinet comprises a touch screen and a field PLC controller, the touch screen and the field PLC controller being communicatively connected, the field PLC controller being electrically connected to electrical equipment for achieving normal operation of the filter press, the centralized control system comprising a lower-level PLC controller and an upper-level industrial computer disposed in a control room and communicatively connected to each other; the lower-level PLC controller being communicatively connected to the field PLC controller; and characterized in that: The system also includes a black water detection device, which includes an illumination sensor and an LED lighting lamp. The illumination sensor and the LED lighting lamp are arranged opposite to each other on both sides of the water receiving tank of the filter press, so that the light beam emitted by the LED lighting lamp passes through the water in the water receiving tank of the filter press and then shines on the illumination sensor. The illumination sensor is electrically connected to the lower-level PLC controller; During implementation, the light beam emitted by the LED lighting passes through the water in the water tank of the filter press and shines on the illumination sensor. The illumination sensor sends the detected light intensity signal to the lower-level PLC controller. The lower-level PLC controller compares the received light intensity signal with the set alarm threshold. When it is determined that the light intensity signal is less than the alarm threshold, an alarm is issued through the upper-level industrial computer, and a shutdown command is sent to the on-site PLC controller. The on-site PLC controller completes the shutdown operation of the filter press. Specifically, the alarm threshold is set based on the light intensity of the LED lighting detected by the illumination sensor when the water in the filter press's water tank is clear. As materials mix into the clear water, the light intensity detected by the illumination sensor decreases. When it drops below the alarm threshold, the lower-level PLC controller determines that black water is present. At this point, the upper-level industrial computer issues an alarm and sends a shutdown command to the on-site PLC controller.

2. The remote control system for a filter press in a coal preparation plant according to claim 1, characterized in that: It also includes a material spraying sensor, which is arranged on the beams on both sides of the press filter plate and is electrically connected to the lower PLC controller.

3. The remote control system for a filter press in a coal preparation plant according to claim 2, characterized in that: There are multiple spray sensors, which are evenly distributed on the beam.

4. The remote control system for a filter press in a coal preparation plant according to claim 3, characterized in that: The spray sensor adopts a water immersion detection sensor.

5. The remote control system for a filter press in a coal preparation plant according to claim 1, characterized in that: A temperature sensor is provided on the filter press feed pump, and the temperature sensor is electrically connected to the lower PLC controller.

6. The remote control system for a filter press in a coal preparation plant according to claim 1, characterized in that: It also includes an on-site secondary instrument box, which includes a digital display and an audible and visual alarm; the temperature sensor is electrically connected to the lower-level PLC controller via the digital display, and the digital display is electrically connected to the audible and visual alarm.

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