How does hydraulic press achieve efficient energy utilization?

2026-03-25 13:53:35

Hydraulic Press is a device that uses liquid as a transmission medium to achieve power transmission, and has the characteristics of efficient energy utilization. The hydraulic transmission system achieves the transmission and conversion of mechanical energy by changing the fluid pressure and flow rate, thereby realizing the action control and working process of the equipment. The reason why hydraulic presses can achieve efficient energy utilization is mainly due to the following reasons.

Firstly, hydraulic presses use liquid as the transmission medium, and the fluid can flow freely during the transmission process without frictional losses in mechanical transmission, thereby reducing energy loss. Compared with traditional mechanical transmission, hydraulic transmission is more stable and reliable, which can reduce energy loss during equipment operation and improve energy utilization efficiency.

Secondly, the transmission system structure of the hydraulic press is simple, and the energy loss during the transmission process is relatively small. The hydraulic transmission system only requires a small number of seals, hydraulic components, and control components, and the entire transmission system has a compact structure, which can reduce energy loss in the transmission chain. In addition, the transmission system of the hydraulic press adopts oil transmission, which has lower viscosity and flow resistance, reducing losses during energy transfer.

Power source optimization: from "constant power" to "on-demand energy supply"

1. Variable frequency drive hydraulic pump (the most mainstream energy-saving solution)

The traditional hydraulic pump motor operates at a constant speed, but still outputs full power during the no-load/low-pressure stage, resulting in a significant waste of energy as thermal energy.

Variable frequency control: Real time adjustment of motor speed and pump flow according to process requirements, achieving "supply as much as needed". When unloaded, the motor runs at low speed or even stops, with an energy-saving rate of up to 30% -60%.

Typical applications: Servo Hydraulic Press, variable frequency four column hydraulic press, especially suitable for intermittent stamping and forming processes.

2. Servo pump control system (advanced energy-saving solution)

Replacing traditional asynchronous motors and variable displacement pumps with servo motors and quantitative pumps results in faster response speed and higher precision in flow/pressure closed-loop control.

No throttling loss, only outputting energy during the working stage, with extremely low energy consumption during standby/holding stage, saving 10% -20% more energy than variable frequency systems. It is a standard configuration for high-end precision hydraulic presses.

2、 Hydraulic system design: reduce throttling and leakage losses

1. Low leakage, high-efficiency valve group and pipeline

Replace traditional slide valves with plug-in valves and logic valves to reduce internal leakage; Pipeline design shortens length, reduces bends, and lowers pressure loss along the way.

Select high-efficiency hydraulic pumps (axial piston pumps, gear pumps) with a volumetric efficiency of ≥ 94% and a mechanical efficiency of ≥ 90% to reduce energy loss inside the pump from the source.

2. Non throttling/low throttling control

Traditional throttle valve speed regulation converts excess energy into heat, while high-efficiency hydraulic presses use volumetric speed regulation (directly adjusting pump flow) to avoid throttling losses.

During the pressure maintenance phase, an accumulator is used to supplement the pressure, replacing the continuous operation of the motor to maintain the pressure, significantly reducing standby energy consumption.

3. Precise load matching

Real time matching of hydraulic system pressure, flow rate, and process load to avoid "big horse pulling small car":

Fast forward/rewind stage: low pressure, high flow, fast movement.

Suppression stage: high pressure, low flow rate, precise molding.

Pressure holding stage: Maintain pressure at extremely low flow rate, with the motor running at low speed or shutting down.