The clamping mechanism is mainly used to install squeeze casting mold

The clamping and locking mechanism is mainly used to install the squeeze casting mold for clamping, opening and ejection. The mechanism is a new type of hydraulic driven mechanical force amplifier with holding brake locking mechanism. It can obtain enough closing force with small hydraulic thrust, so as to save energy and power consumption. The motion characteristics of this mechanism are also very suitable for the requirements of opening and closing action. The mechanism has compact structure, good rigidity and smooth movement. In the locking state, the locking force can be kept unchanged even if the pressure of the closing cylinder disappears.

The holding brake locking mechanism adopts a combined locking positioning oil cylinder. The main part of the holding nut is installed on the upper moving seat plate and moves with it. The holding nut part adopts a split nut mechanism, which can be closed and opened, and is respectively distributed on four pull columns to hold the corresponding pull columns. The serrated thread is used between the holding nut part and the pull column. The designed clearance of the holding thread is 0.2mm. The locking principle is shown in the figure.

1. Pull rod 2. Clutch nut 3. Magnetic head (reading) 4. Grating ruler

When the clamping nut is opened, the upper moving seat plate can move up and down freely along the guide rod and the pull column. When the clamping is completed, the clamping cylinder can adjust the pull column up and down, and its range is controlled within a clamping thread pitch. After the clamping nut of the clamping thread on the pull column is engaged accurately and adjusted to the die clamping locking cylinder, the four clamping nuts are closed to hold the four pull columns respectively, and the upper and lower dies are locked tightly . The clamping force of the new vertical semi-solid metal squeeze casting machine is 3000kN. The four independent clamping cylinders lock the four pull pillars respectively through the four clasps and nuts. Even if there is a certain parallelism error on the parting surface or the upper and lower mounting surfaces of the die, the locking force of each pull rod can be completely the same, and the clamping force can be evenly distributed on the upper moving seat plate. Because the clamping nut is installed on the upper moving seat plate and moves with it, as long as the clamping position is between the clamping thread range of the pull column, the pull column can be slightly adjusted through the clamping cylinder, and the split clamping nut can find the correct position for clamping and locking the pull column, so that the die can be locked according to the set clamping force.

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