초록 ▼

The present invention discloses method and apparatus of protecting a press from being damaged not only under the pressure overload condition, but also under the torsion, power, and energy overload conditions by detecting means for detecting the angular displacement of the crank shaft or the fly whee

The present invention discloses method and apparatus of protecting a press from being damaged not only under the pressure overload condition, but also under the torsion, power, and energy overload conditions by detecting means for detecting the angular displacement of the crank shaft or the fly wheel of the press, and by means of a digital information processor or a microcomputer for calculating the angular velocity, angular acceleration, pressure, torsion, power, and energy load values, and for monitoring the four overload conditions. When at least one of the overload conditions occurs, the digital information processor will immediately send out an overload signal to effect the proper protecting process, including braking the press and releasing the hydraulic buffer means of the press to reduce the impulse of the press.

대표청구항 ▼

A method of protecting a press, which includes a fly wheel, a crank shaft connected with said fly wheel, a ram connected with said crank shaft having hydraluic buffer means mounted therein, and braking means, from being damaged by a pressure overload, a torsion overload, an energy overload, or a pow

A method of protecting a press, which includes a fly wheel, a crank shaft connected with said fly wheel, a ram connected with said crank shaft having hydraluic buffer means mounted therein, and braking means, from being damaged by a pressure overload, a torsion overload, an energy overload, or a power overload, said method comprising the steps of: (a) detecting an angular displacement of said crank shaft or said fly wheel of said press; (b) calculation an angular velocity based on said detected angular displacement; (c) calculating a pressure load value, a torsion load value, an energy load value, and a power load value based on said calculated angular velocity; (d) respectively determining whether said calculated load values exceed their respective permitted safe load limits; and (e) generating an overload signal sent to said braking means to actuate it to brake said press, and to said hydraulic buffer means to release said hydraulic buffer means when at least one of said calculated values exceeds its permitted safe load limit.