Hoist by their own petard: The constraints of hierarchical models
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In the context of the motor skill literature on observational learning and hierarchical skill structuring, Byrne & Russon's findings call into question their standpoint that great apes imitate the behaviour of role models at the programme level. The authors impose a hierarchical model on their observations without properly considering alternative explanations. One such possibility, which stems from a constraints perspective that they dismiss, is put forward.Keywords:
Structuring
Hoist (device)
Taking a single-rope winding hoist with two conveyances as an object of study and taking the kinematics and dynamics in hoist operation as theoretical basis, the paper analyzes unstable operation and increased power consumption of the hoist which are caused by the unequilized weight hoisting system, works out the computer simulation program by use of the MATLAB5.3/SIMULINK3.O, explains various unequlized weight operating modes through diagrams, and points out the factors causing unequilized weight hoisting, and puts forward the measures which should be taken, which have directing effect on mine safety production.
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According to application of main hoist control system in jinneng mine,this article introduces design and research of digitizing reform of hoist control system,and then developed a new kind of control system based on PLC and 6RA70.This paper briefly summarized application of DC speed regulating device in mine hoist control system.Emphatically analyzes its structure based on 6RA70 speed regulating device.Through which can give foundation of remote fault diagnosis of hoist control system.
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The hoist being important equipment of coal mine,the failure of it has large effect on production of mine.On basic of detailed analysis of mine hoist work environment and job characteristics,hoist gearbox vibration model is established,article analyzed vibration characteristics of hoist gear box under condition in which speed and load of gears is changed.What's more,list distribution of gearbox fault signal under variable condition,and it is wished that article can provide some theoretical basis for hoist gearbox fault diagnosis.
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