The advantages of the centralized lubrication system, because there is a supply of pressure oil, it can be lubricated in time with a large number of widely distributed lubrication points, and at the same time, the friction by-products of the friction are removed; mechanical impurities such as metal abrasive particles on the friction surface, With the flow and circulation of the oil, the impurities are taken away and washed away, to achieve good lubrication, reduce friction, reduce wear and reduce the consumption of wearing parts, reduce power consumption, and increase the service life of equipment. However, the maintenance and management of the centralized lubrication system is more complicated and the adjustment is more difficult. Problems in each link may cause the entire lubrication system to fail and stop production. Therefore, it must be continuously improved in future production practices.
Lubrication equipment and devices, control devices and instruments are installed in the entire lubrication system to adjust and control the flow, pressure, temperature, impurity filtration, etc. in the lubrication system to make the equipment lubrication reasonable. In order to make the whole system work reliably, the following automatic control and signal devices should be provided.
1. Host startup control
Before starting the main engine, start the lubricant pump to supply oil to the main engine. The host can only be started when the oil pressure is normal. If the oil pressure fluctuates greatly or the oil pressure does not go up after the lubricant pump starts, the lubrication system is abnormal. At this time, the host cannot rotate even if the operation button is pressed. This is a safety protection measure. There are many ways to control the interlock. Generally, an oil pressure relay is installed on the oil pressure pipeline to control the electrical circuit operated by the host.
2. Automatic start oil pump
In the lubrication system, if the system oil pressure drops below the working pressure (0.05MPa), the standby oil pump starts at this time, and a warning signal is issued at the same time as the startup, the red light is on, and the electric whistle is sounding. At this time, the staff on duty according to the warning signal Check and take action to remove the fault. After the system oil pressure is normal, the standby pump stops working.
3． Force stop host operation
When the standby oil pump is started, if the system oil pressure continues to drop (below the working pressure) (0.08 ~ 1.25MPa), the oil pump will automatically stop running and send a signal; forcing the main engine to stop running at the same time, and an accident alarm signal will be issued. The electric whistle sounded.
4． High voltage signal
When the working pressure of the system exceeds the normal working pressure of 0.05MPa, a high-voltage signal will be issued, the green light will be on, and the electric whistle will beep. The person on duty should check and remove the fault.
Starting the standby oil pump, forcing the main engine to stop, etc., are often controlled by electrical contact pressure gauges and pressure relays.
5. Oil level control of the fuel tank
The oil level control of the fuel tank often uses a float-type liquid level controller with a reed tube. When the oil level of the fuel tank continuously drops to the low allowable oil level, the contact of the liquid level controller is closed, a low liquid level warning signal is issued, the red light is on and the electric whistle is being urged, and the oil pump and the host are stopped. When the oil level of the fuel tank keeps rising (it may be that water or other media enters the fuel tank) and reaches a high oil level, a high liquid level warning signal is issued. The red light is on and the electric whistle is sounding. You should check and take measures to limit it. Remove the fault.
6. Fuel tank heating control
When working in cold areas or winter, the oil in the oil tank should be heated. The temperature of the oil is generally maintained at about 40 ° C to maintain the fluidity of the oil, otherwise the control of the entire system will be difficult due to the low temperature and increased oil viscosity . There are two methods of heating, one is to use steam for heating, which is relatively gentle; the other is to use electric heating elements. The latter heating method is relatively severe, which sometimes causes thermal cracking of the oil, reduces viscosity and generates colloidal precipitates. Both of these methods are equipped with a device that automatically adjusts the temperature. When the oil temperature rises to the specified temperature, the power is automatically cut off or the steam is cut off.
7. System automatic temperature measuring device
The temperature of the relevant parts of the system must be measured regularly during operation in order to grasp the operating situation. Such as the oil tank, drain pipe, oil temperature and water temperature of the cooler, must be measured at any time. For this purpose, an automatic temperature measuring device is used. Commonly used measuring devices are thermal elements and bridge thermometers. You need to twist the switch on the operation panel to measure the temperature of each part.
8. Filter starts automatically
When the pressure difference between the oil flow and the filter is greater than 0.05 ~ 0.06MPa, the filter is blocked. The filter should be activated automatically to remove impurities around the cartridge inside the disc filter. It is usually controlled by an electric contact differential pressure gauge. When the differential pressure decreases (or returns to the allowable differential pressure range), the power is automatically cut off and the cartridge cleaning is stopped
The thin oil centralized lubrication also includes the following two lubrication systems:
1. Centralized circulation lubrication system for oil supply of rotary piston pump
2. Circulating lubrication system for gear oil pump oil supply
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