Komatsu PC450-8 PC300-8 Excavator Hydraulic Accumulator 22U-60-21330

Komatsu PC450-8 PC300-8 Excavator Hydraulic Accumulator 22U-60-21330


Specifiion

Description

A hydraulic accumulator is an energy storage device in a hydropneumatic system. It converts the energy in the system into compression energy or potential energy at the appropriate time and stores it. When the system needs it, it converts the compression energy or potential energy into hydraulic or pneumatic energy and releases it, and resupplys the system. When the pressure of the system increases instantaneously, it can absorb this part of the energy to ensure the normal pressure of the whole system. Hydraulic oil is an incompressible liquid, so hydraulic oil cannot accumulate pressure energy, and must rely on other media to convert and accumulate pressure energy. For example, a bladder-type gas-filled accumulator developed using the compressible properties of gas (nitrogen) is a device for accumulating hydraulic oil. The bladder accumulator consists of an oil part and a gas part with an air seal, and the oil around the bladder is connected to the oil circuit. When the pressure rises, the oil enters the accumulator, and the gas is compressed until the system pipeline pressure no longer rises; when the pipeline pressure drops, the compressed air expands and pushes the oil into the circuit, thereby slowing the decline of the pipeline pressure. Hydraulic accumulators serve two purposes. ①When the flow required by the load is less than the flow of the hydraulic pump during low-speed motion, the excess flow of the hydraulic pump is stored in the accumulator. When the flow required by the load is greater than the flow of the hydraulic pump, the liquid is released from the accumulator to make up for the insufficient flow of the hydraulic pump. . ②When the machine stops but still needs to maintain a certain pressure, the hydraulic pump can be stopped and the leakage of the system can be compensated by the accumulator to maintain the pressure of the system.
Hydraulic accumulators can also be used to absorb pressure pulsations from hydraulic pumps or to absorb hydraulic shock pressures generated in the system. The pressure in the accumulator can be generated by compressed gas, weight or spring, and the accumulator is divided into gas type, weight type and spring type accordingly. The gas accumulator in the gas accumulator is in direct contact with the liquid, which is called the contact type. It has a simple structure and a large capacity, but it is easy to mix gas into the liquid, and is often used in hydraulic presses. Gas and liquid are not in contact with the so-called isolation type, commonly used to isolate the bladder and diaphragm, the volume of the bladder changes a large amount, the volume of the diaphragm is small, often used to absorb pressure pulsation. The heavy hammer type has a large capacity and is often used in systems such as rolling mills for energy storage.

Characteristic

1. Store energy
2. Absorb hydraulic shock
3. Eliminate pulsation
4. Noise reduction
5. Recover energy

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