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When hydraulic equipment controls the load movement, the load force to be overcome may sometimes be very large. For example, the load force that a modern large forging press needs to overcome may reach tens of thousands of tons (about hundreds of millions of newtons). Imagine that this force is the weight of tens of thousands of cars or tens of thousands of tons of huge wheels!
Not only is it big, it is also complex, it is also changeable, and there are unexpected disturbances. Nevertheless, certain requirements need to be met. Because motion is actually a very general term, containing multiple elements: displacement, velocity, acceleration, etc.
1. Accurate positioning accuracy
Plate rolling mills, especially thin plate rolling mills, not only need a lot of force to press the rolls to thin the plates, but also need to accurately control the position of the rolls. The deviation must be less than the diameter of the hair strands to obtain plates with qualified thickness.
Hydraulic elevators, regardless of the weight of the people and goods carried, as long as they are within the scope of safety permits, they must stop accurately to the designated floor. The error is within one or two millimeters, otherwise there will be accidents of people tripping in and out. .
2. Higher speed
To drive a load, there is a certain speed requirement, and the speed is different. The faster the speed, the shorter the time to complete the work and the higher the work efficiency.
Speed ​​is very important for free forging presses of tens of thousands of tons. Because of the high speed, the forging can be completed while the workpiece is still hot and easily deformed.
Excavators also attach great importance to speed, because higher speeds can ensure higher work efficiency and have sufficient impact force when digging hard soil.
3. Limited acceleration
For hydraulic elevators, cranes, etc., not only certain positioning accuracy is required, but acceleration and deceleration are also restricted to reduce impact. The car starts and brakes (brakes) too hard, and the passengers leaned back and rushed forward, which is because the acceleration and deceleration are not well controlled.
Respond quickly according to needs, and change from one motion state to another within a desired time, maintaining stability and less vibration. The term is called good dynamic performance.
As already mentioned, what the hydraulic system can do is "refuel" or "drain oil." Under the action of complex and variable load forces, it is necessary to meet the control requirements of position, speed and acceleration through "fueling" and "oil draining". In addition, there are other restrictions on cost, noise, environmental protection, service life, and so on. It's not that simple, and sometimes it seems impossible. However, this is the mission of hydraulic technology and the vitality of hydraulic technology. Under such difficult conditions, it can be particularly manifested that whoever has the real ability can do better.
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