Sintokogio, Ltd.

Yoichiro Shirai

Masahiko Nagasaka

The invention realizes a method for controlling an electric cylinder and a control system for the cylinder that can prevent a load for pressurizing from significantly exceeding a target load and can shorten the time for the pressurization. A servo controllercan set the speed of the rodand a load for stopping Ps that is used for determining whether the rodshould be stopped so that the load for pressurizing Pm does not significantly exceed the target load Pt. The servo controllerdrives the rodunder the position control mode and determines whether the load for pressurizing Pm that is detected by a load detectoris bigger than or equal to the load for stopping Ps. If it determines that the load for pressurizing Pm is bigger than or equal to the load for stopping Ps, the servo controllerprovides a reverse command pulse signal to a servo amplifierand causes stored pulses in the servo amplifierto decrease, to thereby stop the rod at the load that does not significantly exceed a target load Pt.

Method for controlling an electric cylinder and a control system for the electric cylinder

The present invention is aimed to realize a method and a system for controlling an electric cylinder by which the load detector that is attached to an electric cylinder and the rod of the cylinder can avoid being overloaded. An unexpected bump between the rod of the cylinder and the material to be pressed can cause that overload. A servo controllerdetermines whether the load for pressurizing Pm detected by the load detectoris larger than or equal to the load for detecting a bump Pc. If it is determined that the load for pressurizing Pm is larger than or equal to the load for detecting a bump Pc, the servo controllerdetermines whether the flag for stopping is ON. Also, the controllerdetermines whether the speed Sm of the rodis greater than or equal to an allowable speed to bump Sc. If it is determined that the flag for stopping is ON or if it is determined that the speed Sm of the rodis greater than or equal to an allowable speed to bump Sc, then the rodis crash stopped by providing to a servo amplifiera command pulse signal for positioning in the reverse direction and by decreasing the number of stored pulses in the amplifier

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Shinshiro, Japan

Yoichiro Shirai