High pressure and high flow demand:
Piston pumps have a high pressure rating to meet the needs of high-pressure, high-flow lubrication systems. This property gives piston pumps a significant advantage in lubrication systems where a stable, continuous oil supply is required.
Long life and high efficiency:
The bearing life of the piston pump is long, the total efficiency of the pump can reach 90% and above, and the volumetric efficiency can reach more than 95%. This high performance and long life feature reduces maintenance costs and increases the reliability of equipment operation.
Strong media adaptability:
Piston pumps can be used with a variety of operating media, including mineral oil, emulsions, and other synthetic media. This wide range of media adaptability allows the piston pump to be adapted to different lubrication conditions and requirements.
High adjustment parameters:
The piston pump has a wide range of adjustable working pressure and displacement, which can meet the lubrication needs under different working conditions. For example, working pressures of up to 70 MPa and above, and displacements from a few milliliters per revolution to 1000 ml/r and more, make it possible to precisely control the lubrication system.
Variable Convenience:
Variable displacement piston pumps enable power regulation and infinitely variable speed in hydraulic systems, providing important flexibility for hydraulic drivetrains. In lubrication systems, this feature helps to adjust the lubricant supply in real time according to the operating status of the equipment.

The working principle of the piston pump.

The working principle of the piston pump is mainly based on the reciprocating motion of the plunger in the cylinder to achieve the suction and discharge of liquid. The specific process is as follows:
Oil Suction Process:
When the plunger moves to the right (or when pulled out), the volume of the sealing working chamber in the cylinder block increases and the pressure decreases. At this point, the inlet valve opens and draws the hydraulic oil from the low-pressure area into the working chamber.
Oil pressing process:
When the plunger moves to the left (or pushes inward), the volume of the sealing working chamber decreases and the pressure increases. When the pressure is higher than the outlet pressure, the outlet valve opens to drain the hydraulic oil from the high-pressure area.
Reciprocating motion:
The plunger carries out reciprocating motion under the action of spring or transmission shaft, and continuously repeats the above oil suction and oil pressing process, so as to realize the continuous supply of hydraulic oil.
Variable Adjustment:
Some piston pumps are also equipped with a variable mechanism that regulates the pump’s displacement by changing the inclination of the swash plate. This adjustment allows the piston pump to flexibly adjust the lubricating oil supply according to the actual operating conditions.

The characteristics and application of various types of lubrication pumps

Electric lubrication pump
Features: electric lubrication pump with good lubrication effect, easy to realize the advantages of centralized control. Driven by electricity, can realize the timing, quantitative automatic lubrication, greatly improving the lubrication efficiency and equipment reliability.
Application: It is suitable for large-scale, highly automated mining equipment, such as large coal mining machine, roadheader, etc.. However, because the electric lubrication pump needs electric power support, and the working environment is often complex and changeable, there are certain safety hazards, so in some special environments need to be used with caution.
Manual lubrication pump
Features: manual lubrication pump is easy to operate, without power support, suitable for small equipment or temporary lubrication needs. It is relatively low cost and simple to maintain.
Application: In the routine maintenance of mining equipment, manual lubrication pumps are often used to lubricate small parts or parts that are difficult to automate. Although less efficient, they are irreplaceable in specific scenarios.
Hydraulic lubrication pump
Features: The hydraulic lubrication pump takes hydraulic pressure as the power source and realizes lubricant delivery through hydraulic transmission. It combines the advantages of electric lubrication pumps and manual lubrication pumps, both with high lubrication efficiency, but also to a certain extent to avoid the safety hazards of electric lubrication pumps.
Application: The hydraulic lubrication pump is especially suitable for mining equipment with harsh working environment and high requirements for safety performance. For example, in coal mines and other flammable and explosive environments, hydraulic lubrication pumps are not easy to produce electric sparks and has a higher level of safety. In addition, the liquid lubrication pump is also suitable for the need to frequently adjust the amount of lubrication or lubrication parts of the equipment.

The lubrication pump selection principles

Applicability: according to the specific type of equipment, working environment and lubrication needs to choose the right type of lubrication pump.
Safety: consider the safety performance of the lubrication pump in the process of use, to avoid the selection of lubrication pump there are security risks.
Efficiency and cost: under the premise of ensuring the lubrication effect, try to improve the lubrication efficiency and reduce the cost of use.
Maintenance and maintenance: choose the type of lubrication pump is easy to maintain and repair, in order to reduce maintenance costs and improve equipment reliability.
In summary, mining equipment in the selection of lubrication pumps, should take into account the specific needs of the equipment, the working environment, safety performance and cost-effectiveness and other factors. Through reasonable selection and configuration of lubrication pumps, can ensure the normal operation of mining equipment and efficient production.

Types and classifications
Centralized lubrication systems can be divided into various types according to their characteristics and application needs. According to the lubrication pump oil supply mode, there are manual oil supply system and automatic electric oil supply system; According to the lubrication mode, there are intermittent oil supply system and continuous oil supply system; According to the transportation medium, there are dry oil centralized lubrication system and thin oil centralized lubrication system; According to the lubrication function, there are resistance centralized lubrication system and volumetric centralized lubrication system; According to the degree of automation, there are ordinary automatic lubrication systems and intelligent lubrication systems. In addition, there is a hybrid centralized lubrication system that combines the above systems.

How it works
The working principle of a centralized lubrication system usually involves the following steps: first, the oil or grease is pumped out from the supply source; These lubricants are then conveyed to the various lubrication points via distributors and distribution lines; During the conveying process, the oil gauge ensures that the right amount of lubricant is available at each lubrication point; Finally, the system monitors and adjusts the parameters of the lubricant to ensure the effectiveness of the lubrication and the safe operation of the equipment.

Benefits & Applications
The centralized lubrication system has many advantages, such as timing and quantification, automatic and efficient, labor and cost reduction, and prolonging the life of equipment. It can significantly reduce the wear and failure rate of equipment, and improve the operational efficiency and safety of equipment. At the same time, due to the reduction of lubricant waste and energy consumption, the centralized lubrication system also has a certain environmental protection and energy-saving effect. Therefore, it is widely used in wind power, construction machinery, food processing machinery, metallurgical mining, mechanical processing, port machinery, automobile manufacturing, military vehicles, nuclear power plants and other fields.

Precautions
However, there are some issues that need to be noted with centralized lubrication systems. First of all, it is more costly and may not be cost-effective for some small businesses or occasions with less equipment. Secondly, the system has high technical requirements and requires professional technicians to install, debug and maintain. In addition, the system has centralized control over the lubrication status of the equipment, and if the system fails, it may lead to the lubrication of all equipment being out of control, so regular inspection and maintenance are required.