German SCHUNK workpiece clamps SCHUNK model SCHUNK price

SCHUNK workpiece clamps are one of the actuators for vacuum equipment. Generally, using vacuum suction cups to grip products is the most economical method. Vacuum suction cups come in various types; rubber suction cups can operate at high temperatures, silicone rubber suction cups are very suitable for gripping products with rough surfaces, and polyurethane suction cups are highly durable. In addition, in actual production, if oil resistance is required for the suction cups, materials such as polyurethane, nitrile rubber, or vinyl-containing polymers can be considered for manufacturing them. Typically, to avoid scratching the surface of the product, it is best to choose suction cups with bellows made of nitrile rubber or silicone rubber. The suction cup material is made of nitrile rubber, which has high tensile strength, and is therefore widely used in various vacuum holding devices.

SCHUNK workpiece clamp classification

Clamp types can be classified by usage characteristics as follows: (1) Universal general-purpose clamps. Such as machine vises, chucks, suction cups, indexing heads, and rotary tables, which have great versatility and can adapt well to changes in machining processes and workpieces. Their structures are standardized, with dimensions and specifications serialized, and most have become standard accessories for machine tools. (2) Specialized clamps. Designed and manufactured specifically for the clamping needs of certain product parts in specific processes, with a single service object and strong specificity, generally designed by the product manufacturer. Common types include lathe fixtures, milling fixtures, drill jigs (machine tools used to guide drills or reamers on workpieces), boring jigs (machine tools used to guide boring bars on workpieces), and pallet fixtures (movable fixtures used on automated lines of combination machine tools). (3) Adjustable clamps. Specialized clamps whose elements can be replaced or adjusted. (4) Modular clamps. Clamps composed of standardized elements of different shapes, specifications, and uses, suitable for new product prototyping, single-piece and small-batch production with frequent product changes, and temporary tasks. In addition to vises, chucks, indexing heads, and rotary tables, there is a more common type called tool holders. Generally speaking, when the term tool fixture appears, it mostly refers to tool holders.

SCHUNK workpiece clamp structure

The mechanical gripper-type end effectors used in loading and unloading industrial robots are mostly two-finger claw types. According to the motion of the fingers, they can be divided into translational and rotary types. According to the mechanical clamping method, they can be divided into external clamping and internal expansion types. According to the mechanical structural characteristics, they can be classified as electric (electromagnetic), hydraulic, and pneumatic types, as well as their combinations. When the end effector clamps the workpiece, there should be certain force constraints and shape constraints to ensure that the clamped workpiece is completely released during movement, dwelling, and loading processes. In addition, it should ensure that the geometric deviation of the workpiece clamping posture reproduction is within the given tolerance zone.

SCHUNK workpiece clamp classification

The mechanical gripper end-effectors used in loading and unloading industrial robots are mostly two-finger claw types. If classified by finger motion, they can be divided into translational and rotational types. If classified by mechanical clamping method, they can be divided into external clamping and internal expanding types. If classified by mechanical structural characteristics, they can be divided into electric (electromagnetic), hydraulic, and pneumatic types, as well as their combinations. 1) Pneumatic suction type: Pneumatic suction robot end-effectors use the suction force generated by negative pressure inside the suction cup to hold and move workpieces. The suction cup uses soft rubber or plastic bellows to form negative pressure to hold the workpiece. This type of robot end-effector is suitable for handling large, thin, low-rigidity metal or wooden plates, paper, glass, and curved shells. Depending on the application, the end-effector can be made with single, double, multiple, or specially shaped suction cups. Methods for forming negative pressure include: squeeze-type suction cups, airflow negative pressure suction cups, and vacuum pump exhaust suction cups. Squeeze-type suction cups: Squeeze exhaust suction cups expel all air from the suction cup by downward squeezing force, creating a negative pressure state inside to hold the workpiece. They have advantages such as simple structure, light weight, and low cost. However, the suction force is not large, and they are mostly used for workpieces that are not too large in size, thin, and light. Airflow negative pressure suction cups: An airflow control valve injects compressed air from an air pump through a nozzle, forming a high-speed jet that removes air from the suction cup cavity, creating negative pressure to hold the object. If compressed air is available at the job site, using this type of suction cup is convenient and low-cost. Vacuum pump exhaust suction cups: Vacuum pump exhaust suction cups connect the vacuum pump to the suction cup via an electromagnetic control valve. When the control valve evacuates air, the air in the suction cup cavity is removed, forming negative pressure to hold the object. Conversely, when the control valve connects the suction cup to the atmosphere, the suction cup loses suction force and releases the workpiece. The suction force of vacuum pump suction cups mainly depends on the size of the suction area and the vacuum degree inside the suction cup (referring to the thinness of the air in the inner q cavity). This type of suction cup is reliable and has large suction force, but requires a vacuum pump and airflow control system, resulting in higher costs. 2) Mechanical clamping type: Structure of straight-bar dual-cylinder translational grippers. The gripper fingers are installed on straight bars equipped with finger mounting seats. When pressurized gas enters the rod chambers of the two single-acting dual cylinders, the two pistons move towards the center, clamping the workpiece; when no pressurized gas enters, springs push the two pistons outward, releasing the workpiece. To ensure synchronous movement of the two pistons, a flow divider valve is installed on the cylinder intake line. This type of end-effector is used in loading and unloading assembly workstations.

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