In general, the use of vacuum suction cups is the cheapest way to grab products. There are various types of vacuum suction cups. The suction cups made of rubber can be operated at high temperatures. The suction cups made of silicone rubber are very suitable for grasping rough surface products; the suction cups made of polyurethane are very durable. In addition, in actual production, if the suction cups are required to be oil-resistant, materials such as polyurethane, nitrile rubber or vinyl-containing polymers can be considered to make the suction cups. Usually, in order to avoid scratching the surface of the product, it is best to choose the suction cup material with bellows made of nitrile rubber or silicone rubber to be made of nitrile rubber, which has a large tear-off force, so it is widely used in various vacuum holding equipment. Second, the vacuum suction cup used on the CNC computer gong, the vacuum suction cup is used as a fixture in the CNC lathe machining center. Some workpieces require high surface smoothness, so the fixture of the commonly used CNC computer gong cannot be used. At this time, the vacuum suction cup comes in handy. However, we generally rarely use rubber vacuum suction cups in CNC computer gongs, and more use CNC vacuum suction cups. The so-called CNC vacuum suction cup is a special vacuum suction cup that uses a vacuum generator plus a switch. The suction principle is the same as that of a rubber vacuum suction cup, which creates a vacuum environment so that the atmospheric pressure is strong to press the suction cup on the workpiece. However, the vacuum of the CNC vacuum suction cup is generated by the vacuum generator in the vacuum environment, and there is also a big difference in appearance. The rubber vacuum suction cup is a relatively simple vacuum component, while the CNC vacuum suction cup is like a large plate. CNC computer gongs use vacuum chucks generally because the workpiece being machined has high requirements for surface smoothness or the fixture of CNC computer gongs themselves cannot be used when clamping the workpiece well. It is a relatively inexpensive special fixture in numerical control machine tools.