Why does the vertical injection molding machine mold not open when it can’t be opened?
First of all, it is certain that this equipment has been used for a long time (but the pressure and flow are basically no problem), and the connecting rods, steel sleeves, copper sleeves, pins and other parts of the opening and closing die mechanism have been seriously worn, the lubrication device is bad, and the parts have been lacking lubrication for a long time. You can try the following methods, but you must overhaul or scrap the equipment later.
It should be noted that the following methods have certain dangers, and maintenance personnel must have certain working hours and maintenance experience before they can operate.
1) First loosen the nut connecting the piston rod of the clamping cylinder and the cross to about two-fifths of the original, and then set the pressure speed of the equipment to a large (pressure 140kg/m2, speed 99kpa) Use the point press (to prevent the mold from opening quickly).
2) If it doesn’t work again, loosen the guide rods on both sides of the clamping base, and it can basically be opened.
3) If it doesn’t work again, use a jack to put it between the crank arm cross and the ejector cylinder, so that it is tightened and then open the machine slightly (this action can be repeated and carried out little by little).
4) If it doesn’t work again, then according to the third work, after stopping the device, remove the oil return pipe of the clamping cylinder (reduce the pneumatic force) and open the vertical injection molding machine mold.