Abstract: An injection mold for a high-aspect-ratio double-layer cylindrical plastic part and a molding method using the same. The injection mold includes a support base plate. A movable mold fixing frame and a movable mold base plate are arranged at the middle of a lower surface of the support base plate through positioning screws. A lower core mold is matchingly provided at a center of an upper surface of the support base plate, and is provided with a lower semicircular cavity for accommodating an outer die barrel. One side of the lower semicircular cavity is open, and the other side is provided with a first end wall which is provided with a lower semicircular notch for an inner die rod to pass through. An upper surface of the lower core mold is provided with a positioning protrusion, a lower feeding groove, and a remaining groove.

Abstract: An injection mold for a high-aspect-ratio double-layer cylindrical plastic part and a molding method using the same. The injection mold includes a support base plate. A movable mold fixing frame and a movable mold base plate are arranged at the middle of a lower surface of the support base plate through positioning screws. A lower core mold is matchingly provided at a center of an upper surface of the support base plate, and is provided with a lower semicircular cavity for accommodating an outer die barrel. One side of the lower semicircular cavity is open, and the other side is provided with a first end wall which is provided with a lower semicircular notch for an inner die rod to pass through. An upper surface of the lower core mold is provided with a positioning protrusion, a lower feeding groove, and a remaining groove.

Abstract: The ultrafiltration system for treatment of coal mine water includes an intermediate water pool, an ultrafiltration membrane pool, an adjustment pool, a water production pool, and a water removal pool; wherein the ultrafiltration membrane pool is connected to the intermediate water pool through a water inlet valve and a water inlet pump, connected to the water production pool through a backwashing valve and a backwashing pump, and connected to the water removal pool through a water production valve and water production pump, and the adjustment pool is connected to the ultrafiltration membrane pool; and an ultrafiltration membrane assembly and a cleaning device are disposed in the ultrafiltration membrane pool, an aeration tube is disposed in the ultrafiltration membrane pool below the ultrafiltration membrane assembly, the aeration tube is connected to a blower, and a water production channel in a ceramic membrane assembly is connected to the water production pool.