Crusher load and automatic control of discharge port

Use the microcomputer or analog meter to automatically adjust the size of the discharge port, adjust the ore amount reasonably, make the crusher run at full load, effectively use the input energy, and produce the most qualified products. The crushing operation productivity can be increased by 12%. The product size is reduced by 13 to 28%, the unit energy consumption is reduced by 1.1 to 1.4%, and the wear material loss is reduced by 5 to 7%.

The hydraulic cone crusher load and discharge automatic control system is implemented on the basis of the hydraulic cone crusher, such as the system shown in Figure 1. The crusher load of the system is detected based on the oil pressure in the cylinder and the motor current driving the crusher. Change the speed of the belt to the mining machine to change the amount of the ore and adjust the load of the crusher. The size of the discharge port of the crusher is determined by the amount of oil entering the high pressure cylinder. The oil quantity is converted into the oil level in the low-pressure equal-section oil calculation, which is proportional to the size of the discharge port and is converted into a signal of the size of the discharge port by the liquid level sensor. When controlling the operation of the high pressure oil pump and the solenoid valve, the amount of oil in the high pressure cylinder can be changed to adjust the discharge port of the crusher. Considering the large lag of the system, the load and discharge port adjustment adopts an intermittent adjustment device with adjustable duty cycle. The control characteristics are shown in Table 1.

Figure 1 Block diagram of crusher load and discharge port automatic control system

Table 1 Crusher control characteristics
Drainage port indication
My instructions
Giving amount
Drainage port
Adjustment result
Work area
Upper limit adjustment zone
Lower limit adjustment zone
Work area
Upper limit adjustment zone
Lower limit adjustment zone
increase
cut back
Increase
Decrease
load
Instruction
Return work
Work area
Drainage port
Instructed back
Work area
∆δ=δ 2 -δ 1
∆δ 2 =δ-δ 1
∆δ 1 =δ 1 -δ
∆I=I 2 -I 1
∆I 2 =I-I 2
∆I 1 =I 1 -I
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
-
-
In the table, δ 2 , δ 1 , I 2 and I 1 are the upper and lower limits of the discharge port and the load indication, respectively, which vary with the coarse crusher, the medium crusher and the fine crusher, and the corresponding ∆δ and ∆ I is also different. √ indicates the state of the discharge port and the load indication.

The adjustable working area and the upper and lower limit adjustment areas are set on the discharge port indicator, and the discharge port is not adjusted in the working area. In the upper and lower limit adjustment intervals, the discharge port is adjusted in accordance with the indication value of the load indicator. Adjustable working area, upper and lower limit adjustment area and upper and lower limit area are set on the load indicator, ie pressure gauge and ammeter. The indicator value does not make any adjustments on the work area. The current meter or pressure gauge indicates that the value is adjusted during the upper limit adjustment zone; when the upper limit zone is increased, the discharge port is increased and an alarm signal is issued. When the indicator values ​​of the ammeter and the pressure gauge are in the lower limit adjustment zone, the adjustment action is generated (only one of them does not move); when the indicator value of the electric gauge or the pressure gauge is in the lower limit zone, the system is transferred to the manual and is increased by the operator. Give ore or reduce the discharge port.

On the basis of the above adjustment action, depending on the state of the discharge port and the load indication value, it is decided to change the amount of the ore or change the size of the discharge port. When the discharge port and the load indication value are of the same polarity (both enter the upper limit adjustment zone or both enter the lower limit adjustment zone), the ore amount is first adjusted, the load indication value is returned to the working area, and then the adjustment action of the next step is determined.
When the discharge port and the load indication value are reverse polarity (one in the upper limit adjustment zone and one in the lower limit adjustment zone), the discharge port is first adjusted to return the indication value of the discharge port to the work area. The adjustment action is then determined by the load indication value.
If the load indication value is in the working area, even if the indication value of the discharge port enters the upper or lower limit adjustment area, or the indication value of the discharge port is in the work area, the load index value enters the upper or lower limit adjustment area, and the system generates corresponding adjustment action. Return its indicator value to the work area.
For example, both the discharge port and the load indication value enter the upper limit adjustment zone. The system first reduces the amount of the ore and returns the load indication value to the work area; then the system reduces the discharge port and the discharge port index value returns to the work area. If the load indication value crosses the work area and enters the upper adjustment area, the system reduces the ore supply amount and returns the load index value to the work area.

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