The function of the high-pressure oil pump in a rod mill (prize for replies)

Before the mill is started or simultaneously when it is stopped, high-pressure oil is supplied to the bottom of the main bearings, thereby creating an oil film of a certain thickness and strength between the spindle and the bearing shells. This helps to reduce the starting torque and the starting current, prevents direct contact between the spindle and the bearing shells, and extends the service life of the bearing shells, serving as a form of hydrostatic lubrication. Operation method: Before starting the mill, the high-pressure oil pump must be started manually; it starts automatically when the mill stops.

Its main function is to lift the main bearing when starting and stopping the rod mill. In terms of operation, our factory uses the control panel in the central control room to activate the pre-stop grinding control button

Used before starting and stopping the mill to reduce the starting current load on the main motor.

The high-pressure oil pump, also known as the thrust oil pump, is a design element designed to protect the bearing shells

The function of the high-pressure oil pump is to lift the mill bearings before starting the mill, thereby preventing friction between the bearings and the bearing shells during startup. Our factory’s oil pumps come in both total start and single-act types.

What is the function of the high-pressure oil pump in a rod mill? What is the procedure? Before the mill is started or simultaneously when it is stopped, high-pressure oil is supplied to the bottom of the main bearings, thereby creating an oil film of a certain thickness and strength between the spindle and the bearing shells. This helps to reduce the starting torque and the starting current, prevents direct contact between the spindle and the bearing shells, and extends the service life of the bearing shells, serving as a form of hydrostatic lubrication. Operation method: Before starting the mill, the high-pressure oil pump must be started manually; it starts automatically when the mill stops.

After the high-pressure oil pump starts, it lifts the bearing shells, creating a layer of hydrostatic oil film on them, which reduces the starting torque of the mill and prevents damage to the bearing shells. The high-pressure oil pump of the coal grinder stops automatically 10 minutes after the grinder is started or stopped.

The high and low pressure light oil stations are primarily used for lubricating the hydrostatic and hydrodynamic bearings of coal mills. They are designed based on the principles of hydrostatic and hydrodynamic bearing lubrication, and consist of both low-pressure and high-pressure systems. The main unit is lubricated by the low-pressure system when it is operating normally, while the high-pressure system is used only for starting and stopping the main unit. Before starting the main engine, turn on the low-pressure oil pump first; once the low-pressure oil pump is operating stably, then start the high-pressure pump. The high-pressure system does not have a separate oil tank; the oil is drawn from the tank and supplied to the bearings. When the pressure reaches a certain value (i.e., the set pressure), the main shaft will rise under the action of the pressure oil. At this point, the main engine can be started; once the engine is running smoothly, the high-pressure oil pump stops automatically, and the low-pressure oil pump takes over to supply oil for lubrication. The high-pressure system is also used when the main engine is shut down: the high-pressure pump is started first, and only once the pressure reaches a certain stable level can the main engine be stopped ； After coming to a safe stop, shut down the high-pressure pump first, then the low-pressure pump. This device is highly effective; it ensures a smooth startup of the engine, provides excellent lubrication, and prevents bearing wear. The lubrication station is equipped with an oil filter, cooler, electric heater, oil tank, etc., as well as control elements for oil pressure, oil temperature, oil level, liquid level, and filter pressure difference, enabling interlocked control with the electronic control system.

Its main function is to support the front and rear shafts of the grinder; the low-pressure oil pump should be started first before the high-pressure oil pump, as the outlet of the low-pressure oil pump serves as the inlet for the high-pressure oil pump

The high-pressure oil pump is used when starting and stopping the mill. The mill’s own weight, which includes the steel rods, material, and casing, exceeds 200 tons. Such a heavy rotating body relies mainly on two 120° shaft bearings at the front and back; therefore, lubricating the surfaces of the hollow shafts at the front and back of the mill as well as those of the corresponding shaft bearings poses a challenge. Low-pressure oil spray can only reach the surface of the hollow shafts, and due to the heavy weight, it is difficult for lubricant to reach the friction surfaces between the shafts and bearings. In such cases, high-pressure oil is needed to be applied to these friction surfaces, using the oil pressure to create a small gap between them so that lubricant can fill this gap and form an oil film on the friction surfaces. This oil film prevents direct contact between the shafts and bearings, reduces wear, and extends their service life!