Drive system for operating a crusher and method for operating a crusher
A drive system for driving a crusher of a material crusher plant having a main drive and a power transfer unit driven by the main drive, wherein the power transfer unit drives at least one generator and a first hydraulic pump which is connected to the power transfer unit in a shiftable manner. It is provided that a shiftable fluid coupling is installed in the transmission path from the power transfer unit to the crusher, that the shiftable fluid coupling and a pump are interconnected in a fluid conveying manner in a pump circuit and that a fluid can be supplied to the shiftable fluid coupling by means of the pump. A method of operating such a crusher is also provided.
1. A drive system for driving a crusher of a material crusher plant, comprising:
a main drive;
a power transfer unit driven by the main drive;
at least one generator driven by the power transfer unit:
a first hydraulic pump driven by the power transfer unit and connected to the power transfer unit in a shiftable manner;
a shiftable fluid coupling configured to be interposed in a path of power transmission from the power transfer unit to the crusher; and
a further pump interconnected with the shiftable fluid coupling in a pump circuit such that the further pump supplies a flow of fluid to the shiftable fluid coupling.
2. The drive system of claim 1 , wherein:
the shiftable fluid coupling is configured such that a transmission of power of the shiftable fluid coupling is adjustable by adjusting a filling quantity of the fluid in the shiftable fluid coupling.
3. The drive system of claim 2 , wherein the drive system is configured such that:
in a first operating state a volume flow of fluid supplied to the shiftable fluid coupling is greater than a volume flow of fluid discharged from the shiftable fluid coupling;
in a second operating state the volume flow of fluid supplied to the shiftable fluid coupling is equal to the volume flow of fluid discharged from the shiftable fluid coupling; and
in a third operating state the volume flow of fluid supplied to the shiftable fluid coupling is smaller than the volume flow of fluid discharged from the shiftable fluid coupling.
4. The drive system of claim 1 , further comprising:
at least one valve arranged in the pump circuit to interrupt the flow of fluid to the shiftable fluid coupling.
5. The drive system of claim 1 , wherein:
the further pump is driven by the power transfer unit or by a drive shaft of the main drive or by a shaft of the shiftable fluid coupling.
6. The drive system of claim 1 , wherein:
the shiftable fluid coupling includes holes through which the fluid is routed out of the shiftable fluid coupling due to centrifugal force present inside the shiftable fluid coupling, the fluid subsequently being routed to the further pump.
7. The drive system of claim 6 , wherein:
the further pump has a deliver rate greater than a volume flow through the holes of the shiftable fluid coupling caused by the centrifugal force.
8. The drive system of claim 1 , further comprising:
a control unit configured to detect an overload or a blockage of the crusher, and in event of a detected overload or blockage to output a control signal configured to cause the further pump to be switched off and/or to cause the fluid supplied to the shiftable fluid coupling to be interrupted.
9. The drive system of claim 8 , further comprising:
at least one valve arranged in the pump circuit to interrupt the flow of fluid to the shiftable fluid coupling;
wherein the control unit is configured to control the further pump and/or the at least one valve such that a filling quantity of the fluid in the shiftable fluid coupling increases when a rotational speed of the main drive is increased after a start of the main drive and/or when a rotational speed of the crusher is increased.
10. The drive system of claim 1 , further comprising:
at least one second hydraulic pump connected to the power transfer unit in a non-shiftable manner, the at least one second hydraulic pump being driven by the power transfer unit.
11. The drive system of claim 1 , further comprising:
a belt drive including a drive pulley connected to the shiftable fluid coupling, the belt drive being configured to connect the drive system to the crusher.
12. The drive system of claim 1 , further comprising:
an auxiliary drive operatively connected with the drive system downstream of the shiftable fluid coupling, the auxiliary drive being configured to drive the crusher.
13. The drive system of claim 12 , wherein:
the auxiliary drive includes a hydraulic motor, the hydraulic motor being driven by a hydraulic pump driven by the power transfer unit.
14. The drive system of claim 1 , further comprising:
a cooler arranged in the pump circuit such that the fluid flows through the cooler.
15. The drive system of claim 1 , further comprising:
an interim reservoir arranged in the pump circuit to receive return flow from the shiftable fluid coupling to the further pump.
16. A method of operating a crusher of a material crusher plant, the method comprising:
providing a material crusher plant having a drive system driving the crusher, the drive system including at least one main drive, a power transfer unit, and a shiftable fluid coupling arranged between the power transfer unit and the crusher;
reducing a fluid level of fluid in the shiftable fluid coupling in an event of a blockage of the crusher; and
increasing the fluid level of fluid in the shiftable fluid coupling as a load on the crusher is increased.
17. The method of claim 16 , further comprising:
reducing the fluid level of fluid in the shiftable fluid coupling for starting the main drive.