Comparison of servo hydraulic press and ordinary hydraulic press
Release time:
2022-07-19
Servo hydraulic press The comparison with ordinary hydraulic presses is as follows.
Energy saving of servo hydraulic press:
The power consumption of the servo motor is more than 70% less than that of ordinary hydraulic systems or proportional systems. This is a conservative value from our actual tests. Ordinary hydraulic systems or proportional systems consume power even when the machine is not working after startup; hydraulic systems refer to the motor stopping when the oil cylinder is not moving up and down after the machine starts, and even the current decreases when the load decreases during use.
Knowledge and characteristics of servo hydraulic press:
The failure characteristics of engineering machinery equipment are different, and different characteristics are applied in different usage stages.
(1) Initial failure characteristics of engineering machinery. The failure rate of machinery in the initial use stage (equivalent to the transition time) decreases from high to low (descending curve). The initial failure rate is related to manufacturing or maintenance quality and service life. If the construction machinery is of good quality and can be used and maintained normally, then the initial failure rate is low; otherwise, the early failure rate will be very high. Early failures are mainly caused by loose or loosened connecting bolts; loose or detached pipe joints; residual metal chips or casting sand easily block oil passages or clamps, causing oil leakage; changes in the relative motion friction of traction parts (such as the servo hydraulic press system of the actuator cylinder) caused by adjusting the gap or pressure, making the mechanical parts unable to perform the required capabilities; knowledge and characteristics of servo hydraulic press; oil leakage, seepage, and air leakage in some joints.
(2) Failure characteristics of engineering machinery in the normal use stage. After the completion of mechanical construction, personnel use it normally. In this stage of mechanical operation, as long as the maintenance and use are appropriate, generally no failures will occur. Even if failures are random (this kind of failure is hidden and difficult to find during maintenance or inspection), the failure rate is very low, and the curve rises slightly. If engineering machinery fails during normal use, improper use will cause many sudden events or maintenance.
(3) Repair stage. When the construction machinery is approaching the failure characteristic, when the engineering machinery is used in the overhaul period, the wear and tear of each part increases. The characteristic of technical degradation failure in this stage is a high failure rate. Generally speaking, it is mainly due to aging of parts caused by wear and tear, resulting in more frequent blockages, leaks, and other adverse phenomena.
(4) Failure characteristics of engineering machinery in different seasons. The failure rate of engineering machinery is related to the season. The failure rate in winter is higher than that in summer. For example, due to low temperature, the fuel supply system often has less atomization in winter, the fuel is easy to solidify and block, it is not easy to start, or the engine runs and stalls, the lubricity of lubricating oil, accelerated mechanical wear, battery leakage, etc., make it difficult to start the engine, unreliable braking, and abnormal fluid transmission.
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CNC hydraulic oil pumps generally use internal gear pumps, while traditional hydraulic presses generally use axial piston pumps. At the same flow rate and pressure, the noise of an internal gear pump is 5 dB to 10 dB lower than that of an axial piston pump. The motor of a CNC hydraulic press runs at rated speed during pressing and return, and its noise emission is 5 dB to 10 dB lower than that of a traditional hydraulic press. When the slider rapidly descends and is stationary, the servo motor speed is 0, so the CNC hydraulic press has essentially no noise emission.
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