Manual clamping
Clamps that position and clamp the workpiece manually. When operating manual clamps, the auxiliary time is longer, which relatively affects production efficiency, is more laborious, and requires higher labor intensity for workers. big. On the other hand, the clamping force is uncertain when manually clamping the workpiece, which sometimes affects the machining accuracy.
However, manual clamps are still widely used due to their simple design, easy manufacturing and low cost. Manual clamps can adopt various mechanisms, so manual clamps are highly adaptable.
Pneumatic clamping
During pneumatic clamping, the pneumatic clamping device uses compressed air as the power source to push the clamping mechanism to clamp the workpiece. At present, it is mainly used in floor-standing electronic universal testing machines. The commonly used cylinder structures are piston type and membrane type. Piston cylinders are classified into three types according to the cylinder clamping method: fixed, swing and rotary. According to the working mode, they are classified into two types: one-way action and two-way action. The most widely used is the double-action fixed cylinder.
1. Pneumatic transmission responds quickly and moves quickly (the average movement speed of the piston or cylinder is generally 0.5~1m/s, and can reach 10 m/s at high speed). Therefore, in production, it is necessary to assist Short time, high production efficiency
2. Simple transmission circuit, easy operation, convenient system and maintenance
3. Strong adaptability to working environment, can be used in flammable, explosive, It works reliably and is safe to use in environments with strong magnetism, radiation, moisture, vibration and large temperature changes
4. Using air as the medium, the energy supply is convenient. After use, it is discharged into the atmosphere, without the need for pipelines and recovery devices
5. Since the compressed air is convenient for centralized supply and long-distance transportation, it is convenient for centralized control, program control and overload protection
6. The medium is clean and leakage will not cause pollution
Hydraulic clamping
The hydraulic clamping device uses liquid pressure to position and clamp the workpiece. Mainly used in hydraulic universal testing machines. As a type of fixture, hydraulic clamps use standard hydraulic components. The working medium used is pressure oil. The mechanical components are designed according to the characteristics of the processed parts and are organically assembled and connected together.
Hydraulic clamping has the following advantages:
1) The transmission force is large and the clamp structure is relatively small;
2) The oil is incompressible and the clamping is reliable , work smoothly;
3) Low noise. Its disadvantage is that it requires a special hydraulic system and its application range is limited.
4) Small time constraints during clamping
5) Able to maintain constant clamping force