PROBLEM TO BE SOLVED: To provide an apparatus and method for protecting a manual hoisting machine with an electric auxiliary motor in which the weight of a load lifted and lowered can accurately be detected with a simple structure, and the over-hoisting operation of the weight greater than the product rating, the over-speed operation of the speed greater than the product rated speed and the over-work-rate operation more than the product rating total work-rate can be prevented.SOLUTION: An apparatus for protecting a manual hoisting machine with an electric auxiliary motor is provided. Control means (200) stops the rotary support of a load sheave (2) by an electric auxiliary motor (9) when a rotational speed (N) exceeds an allowable upper limit rotation speed, and when a weight value of a load L exceeds a predetermined allowable upper limit weight value. The control means calculates a work rate when not exceeding it, and when the work rate is not beyond an allowable upper limit work rate, the support is executed by an electric motor at a predetermined support rate. When the work rate exceeds the allowable upper limit work rate, the support rate is decreased until it becomes lower than the allowable upper limit work rate, and then the support is executed at a predetermined support rate.SELECTED DRAWING: Figure 1
【課題】昇降させる荷の重量を簡単な構成で精度よく検出でき、製品定格を超える重量の過巻上げ運転、製品定格速度を超える過速度運転、製品定格総仕事率を超える過仕事率運転を防止できる電動補助モータ付き手動巻上機の保護装置、及び保護方法を提供する。【解決手段】電動補助モータ付き手動巻上機の保護装置であって、制御手段(200)は回転速度(N9)が許容上限回転速度を超えた場合、及び荷Lの重量値が所定の許容上限重量値を超えた場合に電動補助モータ(9)によるロードシーブ(2)の回転支援を停止し、超えない場合には仕事率を算出し、仕事率が許容上限仕事率を超えない場合は所定の支援率で電動モータによる支援を実施し、仕事率が許容上限仕事率を超えた場合は支援率を許容上限仕事率以下になるまで減少させてから所定の支援率で支援を行う。【選択図】図1
APPARATUS AND METHOD FOR PROTECTING MANUAL HOISTING MACHINE WITH ELECTRIC AUXILIARY MOTOR
電動補助モータ付き手動巻上機の保護装置、及び保護方法
2017-06-29
Patent
Electronic Resource
Japanese
IPC: | B66D Haspeln , CAPSTANS |
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