The function of vacuum suction cup, detailed diagram of vacuum suction cup principle

The function of vacuum suction cup

Vacuum suction cups are often called suction cups, also called vacuum spreaders. When the suction object comes into contact, a temporary sealed space will be created. By removing or thinning the air in the sealed space, the vacuum suction cup can quickly make the inside and outside of the space A pneumatic component that operates under a large pressure difference.

The raw materials of vacuum suction cups are generally composed of various rubbers, plastics and metals. According to the type of confined space, it can be divided into pneumatic suction cups and manual suction cups. Using vacuum suction cups to grab products is the cheapest method.



There are various types of vacuum suction cups. Suction cups made of rubber can operate at high temperatures. Suction cups made of silicone rubber are very suitable for grabbing products with rough surfaces. Suction cups made of polyurethane are very durable. In addition, in actual production, if required, chuck can be oil-resistant, you can consider using polyurethane prepolymer, butyl rubber or vinyl polymer materials to make suction cups.

The vacuum suction cups we often see are made of NR, NBR, SI, FKM, PUR, NE, EPDM, SE and other rubbers. If we classify according to the shape, it can be divided into flat chuck, oval chuck, corrugated chuck, and special-shaped chuck, which are further divided into second corrugated chuck chuck, three-layer and multi-layer corrugated chuck suction cups.

Detailed drawing of vacuum suction cup principle

Under normal circumstances, in order to avoid scratches on the product surface, the best choice may be silicone rubber, nitrile rubber and bellows suction cups. When EOAT uses a vacuum suction cup (without clamp), it should be noted that the moving speed of the manipulator cannot be too high, otherwise a shearing force will be generated on the suction cup, making the product easy to fall during rapid changes. . In some cases, clamps can be used to ensure safe product transportation.



Considering the possible adhesion of the product to the mold, a gas clamp can generally be installed to solve this problem. When the surface area of ​​the product is too small or the product is too heavy to use a vacuum suction cup, this problem can also be solved by using clamps.

If the product has strict requirements on appearance, then the clamped part cannot be the surface. After confirming that the clamp or suction cup has grasped the product, the sensor will send a signal to the manipulator so that it can proceed with the next operation.



In cases where the movement capacity of the robot is limited and requires manual twisting or tilting to demould the product or move the product and EOAT out of the molding area, a special cylinder can be added that can move the EOAT independently without relying on the operation of the robot, thereby making this possible. One problem has been improved.

The terminal tool used for in-mold labeling can perform three actions: In a limited space, EOAT first picks up and penetrates the label, and then fixes the label in the mold. This operation can reduce the size of the equipment compared to static labeling equipment.



The final action of EOAT is to remove the branded plastic bottle from the mold. Generally, when molding auto parts, the product must be handled with special care on a horizontal floor. In order to avoid the occurrence of nicks on the surface, the use of vacuum suction cups must be avoided. At this time, you can consider installing a clamp made of acetal on the EOAT, which can effectively avoid scratching the surface of the product.

So, how to use EOAT for complex machining and molding processes? To illustrate this problem, let's take an example of stack injection molding using nylon and rubber. In this example, a versatile End-of-Arm Tool (EOAT) is used to put operators at hand.