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1.发明授权Control arrangement for grinding machines for preventing operation under dangerous conditions 失效用于在危险条件下防止操作的磨床的控制装置
公开(公告)号：US3570189A
公开(公告)日：1971-03-16
申请号：US3570189D
申请日：1968-05-01
Applicant: ASEA AB
Inventor： KEDING OLLE , FAHLMAN PER-OLA
Abstract: IN A PROTECTIVE DEVICE FOR A GRINDING MACHINE HAVING A MOTOR DRIVING A GRINDING WHEEL, THE SPEED OF ROTATION OF THE GRINDING WHEEL IS MAINTAINED SUBSTANTIALLY INVERSELY PROPORTIONAL BY A RELAY WHICH IS RESPONSIVE TO THE DIFFERENCE BETWEEN TWO SIGNALS WHICH VARY WITH THE DIAMETER AND SPEED RESPECTIVELY. A SECOND RELAY IS FURNISHED ADDITIONALLY WITH A CONSTANT SIGNAL AND OPENS A SWITCH IN THE CIRCUIT TO THE MOTOR WHEN THE DIFFERENCE BETWEEN THE FIRST TWO SIGNALS IS GREATER THAN THE THIRD SIGNAL. A TIME-DELAY RELAY IS PROVIDED WHICH, WHEN THE MOTOR STARTER BUTTON IS OPERATED, BYPASSES THIS SWITCH FOR A LONG ENOUGH TIME TO ALLOW THE MOTOR TO COME UP TO MINIMUM SPEED.
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