The “suction machine” is widely used for conveying raw materials in injection molding, and can automatically feed materials to the injection molding machine. When there is a shortage of material in the barrel of the injection molding machine, a signal will be given to the suction machine. The suction machine uses the principle of suction to transport plastic raw materials to the material barrel of the injection molding machine. When the material reaches a certain level, the suction machine stops, and when the material is insufficient, it can be transported again. The suction machine, also known as a plastic suction machine, is suitable for short materials. If the material is too long, it can easily wrap around the shaft and cannot be used. When crushing materials, the size of the bottom hole of the crusher can be adjusted appropriately according to the usage situation.