JPH0470440U

JPH0470440U -

Info

Publication number: JPH0470440U
Application number: JP11294790U
Authority: JP
Priority date: 1990-10-29
Filing date: 1990-10-29
Publication date: 1992-06-22

Description

[Brief explanation of the drawing]

第１図は本考案の一実例を示す概略構成図、第
２図は本考案に係る自動工具交換装置の動作開始
から動作終了までの１サイクルの電流値の変化を
示す電流波形図で、縦軸に電流値、横軸に時間を
とる。１……数値制御装置、２……設定値設定部、３
……比較演算部、４……速度制御部、５……増幅
器、６……電動機、７……自動工具交換装置、８
……入力電流計測回路、９……速度検出器。 Fig. 1 is a schematic configuration diagram showing an example of the present invention, and Fig. 2 is a current waveform diagram showing changes in current value in one cycle from the start of operation to the end of operation of the automatic tool changer according to the present invention. The axis shows the current value, and the horizontal axis shows time. 1... Numerical control device, 2... Set value setting section, 3
... Comparison calculation section, 4 ... Speed control section, 5 ... Amplifier, 6 ... Electric motor, 7 ... Automatic tool changer, 8
...Input current measurement circuit, 9...Speed detector.

Claims

[Scope of Claim for Utility Model Registration] (1) In an automatic tool changer that automatically changes tools by a single electric motor or the like via a cam mechanism, the operating reference speed of the automatic tool changer is set in advance. . An automatic tool change protection device, characterized in that the load condition is monitored based on the input current value of the electric motor during the tool change operation, and the tool change speed is changed. (2) An overcurrent value determined from the rated capacity of the motor is set in advance, and when the input current value of the motor exceeds the overcurrent value, the tool changing operation is stopped and an abnormality alarm is issued. An automatic tool change protection device according to claim 1 of the utility model registration claim. (3) A request for registration of a utility model characterized in that a dead band that can be determined arbitrarily with respect to the reference current value of the motor is set in advance, and the exchange speed is changed only when the input current of the motor exceeds the dead band. Automatic tool change protection device according to item 1. (4) A utility model characterized in that an abnormal current range that can be arbitrarily determined within the rated capacity of the motor is set in advance, and an abnormality alarm is issued when the input current value of the motor exceeds the abnormal current value. An automatic tool change protection device according to claim 1. (5) Set the minimum speed of the motor in advance,
The automatic tool change protection device according to claim 1, wherein an abnormality alarm is issued when a speed detected by a speed detector provided in the electric motor is lower than the minimum speed.