Abstract: A plastic injection mechanism (20) of a plastic injection apparatus used for extruding molten plastic into a mold (16) comprises a fixing base (22); a material injection device (28) pivotably attached to the fixing base (22); and a rotating device (30) disposed between the material injection device (28) and the fixing base (22), the rotating device (30) being connected to the material injection device (28), wherein driving the rotating device (30) causes the material injection device (28) to move in a linked manner, enabling the material injection device (28) to rotate and shift with respect to the fixing base (22). The material injection device (28) of the plastic injection mechanism (20) can be adjusted to be in an inclined state, enabling a user to carry out excess material discharge and cleaning conveniently.

Abstract: A vertical plastic material drying apparatus having an initial dryer, a vacuum drying hopper and a storage hopper, which form a vertical combination. The storage hopper is connected to a molding machine. A control valve is disposed between neighboring two of the initial dryer, the vacuum drying hopper and the storage hopper and controls the falling amount of the granular or powdery plastic material. In addition, a hot air steam device is connected to the initial dryer and provides the high-temperature hot air to enter the initial dryer. A vacuuming device is connected to the vacuum drying hopper and vacuums the gas from the vacuum drying hopper. Because the initial dryer, the vacuum drying hopper and the storage hopper are combined into the vertical form and cannot be moved, the ground area occupied by the drying apparatus is smaller so that the optimization spatial availability is obtained.

Abstract: A vacuum drying apparatus of a circulative preheating type comprises a working area, containing a material-filling-preheating sub-area, a heating sub-area, a drying sub-area, and a material-discharging sub-area; a rotatable frame, rotatably installed in the working area and having four accommodating spaces corresponding to the sub-areas of the working area, respectively; four cylinders, installed in the accommodating spaces of the rotatable frame and corresponding to the sub-areas of the working area; and a driving assembly, connected to and thereby driving the rotatable frame to rotate; wherein when the rotatable frame rotates, each of the cylinders is moved from a currently corresponding sub-area to an adjacent said sub-area. Thereby, since the cylinders have been preheated in the material-filling-preheating sub-area before receiving a heating procedure in the heating sub-area, a required duration of the heating procedure can be reduced.

Abstract: A type of four-way valve, in the technical field of plastic processing, is designed to facilitate easy production and accurate control. The four-way valve has two inlets and two outlets, including: a container main having a movable cover and divided by four partition boards into five spaces. Each sidewall of its foremost space and hindmost space has a through hole that is respectively connected to a three-way pipe, each partition board has a vent groove, so that all spaces are communicating with each other; a cylinder having a spindle that is connected to a fore piston and hind piston penetrating four spaces from the fore part, the fore piston and the hind piston respectively located in the second space and the fourth space.