The clamp is of high location precision, strong clamping force, enough rigidity.
The elastic rigidity of rail pad and ballast stiffness of rail and clamping force of fastener are the main factors that cause the widening of gauge.
When jigs and fixtures are designed, the clamping system is designed to ensure that the correct clamping force is applied, and that the clamps can be operated quickly but with safety.
Aiming at these problems, this paper studies how the original error affects the accuracy, works out its allowable values, and finds out the equation between friction of pins and clamping force.
And the same time because of the two-step force-amplifier, lower press result in the smaller clamping force of pneumatic drive system is solved.
It can produce more clamping force by less motive power, and multiplying of force - increasing can be adjusted by the designer in according with the practice situation.
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