Analysis of the working principle of four-column hydraulic press

●The basic composition of four-column hydraulic press

The four-column hydraulic press is mainly composed of three parts: main motor, hydraulic control system and electrical control system. The main motor includes a worktable, a guidepost, a slider, an upper cylinder, a knockout cylinder, and other structures; The hydraulic system consists of control elements, operating elements, auxiliary elements, power units, working media, etc .; The electrical control system is mainly composed of relays, contactors, buttons, travel switches, and electrical control cabinets.

●Working principle of four-column hydraulic press

①Four-column hydraulic press main unit composition diagram

②Analysis of the working principle of four-column hydraulic press

The operation sequence of the four-column hydraulic press is controlled by the electrical system and the hydraulic system. The control sequence block diagram is shown in the figure.

As can be seen from the above control sequence block diagram, the working principle of the hydraulic press is controlled by the electrical control system. The hydraulic control system then controls the work of the host. The host's action touches the travel switch, and the signal is fed back to the electrical control system to achieve cyclic control.

③Analysis of the working cycle of a four-column hydraulic press

The working cycle of the four-column hydraulic press is shown in figure (a). The slider quickly descends under the action of its weight. After touching the stroke switch, it changes from fast forward to industrial advance, and then pressurizes and maintains pressure. After the dwell time is completed, the slider returns quickly until it returns to its original position and stops moving; Figure (b) shows the working cycle of the ejection cylinder. After the main cylinder is fast-forwarded, advanced, held, and retracted, the ejection cylinder only moves to eject the work piece.