SKT Intelligent High-Efficiency Jig

1. Control of the feeder

In the controller, the two function blocks of coal quality feeding and automatic discharge share the detected thickness values of the first and second heavy material layers for analysis and decision-making; the coal quality feeding function converts the corresponding decision result into an analog signal output to control the frequency of the frequency converter to realize automatic coal feeding. If the feeder does not use automatic feeding control, a frequency conversion adjustment method can be used, and the control of coal feeding is manually adjusted.

2. Air valve system control

The jig has 3 compartments, each with an air chamber, controlled by two sets of pneumatic valve units. The entire machine consists of 6 sets of pneumatic valve units. 1 Pneumatic air source: The pneumatic pipeline from the high-pressure air bag to the air cylinder passes through the air source triplet (air filter, pressure regulator, oil mist) to filter the high-pressure air, regulate the pressure, and send oil mist into the cylinder to drive the cylinder piston to move up and down. 2 Pneumatic valve control: By controlling the two-position four-way solenoid valve to drive the cylinder piston to move up and down to open or close the air valve, the intake valve and exhaust valve are opened and closed. Each air chamber has an intake valve and an exhaust valve. 3 Control of jigging frequency: Adjust the on-off time of the intake and exhaust solenoid valves to change the jigging frequency. The setting of the jigging frequency can be changed through the human-machine interface.

3. Discharge control

The automatic discharge device is composed of a mechanism and a float device. The float device is composed of a float, a counterweight, and a displacement sensor. The height of the float can be adjusted by adjusting the number of counterweights. In normal operation, the float pulsates with the jig, and the height of its layer increases as the heavy material increases. The corresponding 4--20MA electrical signal is output through the displacement sensor as the basis for controlling the actuator. When the heavy material in a given layer increases, the float rises and the output electrical signal is large, and the discharge port increases; otherwise, the float falls and the output electrical signal decreases, and the discharge amount decreases.

4. Measurement system

While outputting the air valve control signal, the controller receives the coal bunker level and the thickness measurement signals of the first and second heavy material layers, which generate feedback on the discharge and coal feeding, and realize the dual optimization control of the first and second discharge systems and coal feeding; it constitutes real-time tracking of the raw coal quality changes entering the washing process, and automatically optimizes and adjusts during dynamic operation.

5. Human-machine interface

The control system uses PLC as the control core and is equipped with a human-machine interface. Operators can set parameters and operate controls on the human-machine operation interface. On the basis of the above-mentioned main functions, it is equipped with communication with the coal preparation plant's centralized control and operation interlock with key equipment on site; at the same time, the control system is equipped with multiple operation modes for manual/automatic switching, forming control operation as the main mode and other operation modes as auxiliary, to adapt to the operation needs under various complex conditions on site.

System configuration

The programmable controller of this system adopts FX2N-40MRRLC produced by Taiwan Delta Company. It has stable performance, powerful functions, simple, flexible and convenient programming, and strong anti-interference ability. It collects standard analog signals from sensors (such as 4--20mA signal from material displacement sensor) through digital input/output modules. It can meet the entire control requirements, and also has a strong network communication function. It connects with other equipment and computers through the network bus, and reflects the things on the industrial site to the upper computer in real time, such as the computer in the control room in the dispatch.

The host computer adopts PWS series 10 touch screen produced by Taiwan Da Company. On the touch screen, you can make pictures to simulate the working status of the equipment and operation buttons to control the operation of the equipment.

System configuration features

1. Can be switched manually/automatically.

2. Parameters can be operated, controlled and changed through the human-machine interface.

3. Closed-loop feeding and discharging control can be implemented through feedback of measurement signals.

4. It can be networked with the distributed control system, and can form interlocking control with other related systems.

Note: The specifications listed in the table are some of the specifications manufactured by our company. Our company can meet the different needs of large, medium, and small coal preparation plants and design various types of specifications.