The belt pulley is designed with the name of the injection molding machine. The model of the injection molding machine is XS-ZT-1000, and the cavity is designed as one mold and one cavity, which CrWMn be used for small batch production. The whole mold is 17 1 mm high, 250mm wide and 255mm long. The basic material of the overall design is 45 quenched and tempered steel, which is low in price and convenient to purchase. The largest pulley diameter of the product is 88 mm, and the thickness is 2 1.5 mm. The plastic pulley is made of ABS material, which has the advantages of excellent impact strength and no rapid temperature drop. Good mechanical strength, hardness, wear resistance, cold resistance, water resistance, chemical stability and electrical properties. Because of the pulley groove on the side, the core-pulling mechanism of the lateral inclined slider designed by the injection molding machine is composed of left and right molds and positioned by pins, which is simple, reliable and easy to manufacture. The push-out of the open scale uses the oblique thrust to drive the inclined slider to move, and the plastic parts are pushed out, and the lateral ejection and core-pulling actions are completed by the inclined slider. The surface quality of its parts is not very strict, so the requirements for the processing technology of parts are not very high. The design drawing adopts three-dimensional rendering parameters, which greatly improves the recognition ability of complex surfaces and reduces the time for manufacturing workers to look at drawings. Moreover, when parts of different sizes are manufactured, they are quickly modified, eliminated and put into production.