Ejector cylinder for four-column hydraulic press

When it comes to maximizing efficiency and performance in manufacturing, particularly in metal forming and pressing operations, the ejector cylinder plays a crucial role. This blog delves into the function, benefits, and considerations of ejector cylinders in four-column hydraulic presses.

What is an Ejector Cylinder?

An ejector cylinder is a specialized hydraulic component used to push or eject a workpiece out of a press after it has been formed or pressed. In a four-column hydraulic press, the ejector cylinder ensures that the finished product is smoothly and efficiently removed from the press, which is critical for maintaining high production rates and operational efficiency.

Benefits of Ejector Cylinders in Four-Column Hydraulic Presses

Why does the four-column hydraulic press have a top-out cylinder? If you look closely, you will find that most four-column hydraulic presses have an ejector cylinder. So why should the four-column hydraulic press have an ejector cylinder?This is because many times when we have processed a product that requires a part to pull the product out of the mold, it is necessary to install the ejection cylinder.

Enhanced Productivity: Ejector cylinders significantly reduce the time required to remove finished products, leading to shorter cycle times and increased production rates.

Consistency: They ensure consistent ejection force, which helps in maintaining uniform quality and reducing defects.

Reduced Manual Labor: By automating the ejection process, ejector cylinders minimize the need for manual intervention, thereby reducing labor costs and improving workplace safety.

Minimized Damage: Proper ejection minimizes the risk of damage to the workpiece and the press, as the controlled force prevents unintended impacts.

How Ejector Cylinders Work

Ejector cylinders operate on the principles of hydraulic pressure. They are connected to the hydraulic system of the press and utilize pressurized fluid to generate the force needed to push the workpiece out of the press. The basic operation involves:

Activation: The ejector cylinder is activated either manually or automatically, depending on the press’s control system.

Ejection: The hydraulic fluid creates pressure that extends the cylinder rod, pushing the workpiece out of the press cavity.

Retract: Once the workpiece is ejected, the cylinder retracts, ready for the next cycle.

The function of the four-column hydraulic press ejector cylinder is very simple. In general, it is used for demoulding to lift the workpiece from the die. However, the price of a four-column hydraulic press equipped with an ejection cylinder is more expensive than that of a conventional four-column hydraulic press. Because the cylinder is a relatively important component on a four-column hydraulic press, adding a cylinder is costly.

The first step of the working process of the ejection cylinder is the ejection of the workpiece. The specific realization is that when the main cylinder returns to the movement, the stop button is pressed, and the corresponding three electromagnets are energized, and two of the cartridge valves are opened, 2 The hydraulic oil enters the lower chamber of the ejection cylinder through the valve insertion valve, and the oil in the upper chamber flows back to the oil tank through the valve, and the workpiece is ejected. The second step is to retract the cylinder, first press the retract button, the electromagnet loses power, the other electromagnets are energized, the cartridge valve is opened, the hydraulic oil enters the upper chamber of the ejecting cylinder through the valve, and the oil in the lower chamber passes through the valve. The valve flows back to the tank and ejects the cylinder back. When these steps are completed, the next step is started and a circulation system is formed to maintain the continuous movement of the four-column hydraulic press.

In contrast, the movement process of the four-column hydraulic machine master cylinder is more complicated and the steps are more, but the working process of the ejection cylinder is very simple, two steps only, and the movement of the ejection cylinder occurs when the master cylinder moves. After that, the work process of the ejection cylinder is started immediately, and the two can be said to be closely related.