Single girder crane FAQ

時間：2013-10-10作者：YuantaiCraneMachinery瀏覽：45

Refers to the single beam crane hoist crane to lift the organization , its trolley hoist means , and its operating principle is equivalent to hoist cranes. Because of its simple layout , ease of operation ( operating mode based mainly on the ground ) , low cost, in the machinery , chemicals, light industry and other occupations are widely used. Because of the special nature of this crane , the operator often a person on the ground several roles together as operations, company search , commanding the mission , there are many unsafe operation risk .

To prepare for this type of single-girder crane lifting attack damage incidents , GB6067-1985 " crane safety regulations " and other requirements associated with electric hoist national norms have been necessary to have safety equipment, such as limit switch, end stops , buffers, safe braking equipment , etc. These safety devices are equipped with improved land hoist cranes , safe, secure , but because depict episodes produced their own shortcomings , and other reasons , the current single- girder crane hoist safety measures Not yet perfect, according to the usual experience of discovery hoist crane inspection at the wrong phase maintenance, preventive maintenance of off-axis , buffer settings, etc. , there are still shortcomings or lack thereof.

Because hoist cranes used conical brake three-phase asynchronous motor as power equipment, while the three-phase asynchronous motor operating direction of the phase sequence of the power supply on . When the power supply phase sequence changes in attack , the motor operating direction opposite to the original direction , at the moment at the door flashlight parade " down" button, spreader rise, and increased extreme position limiter has no effect , because the simple form incidents this year types of crane will attack phase formation due to the wrong drum crushing , kneading hook block deformation , lifting rope pull off such incidents . And the current production and the extensive use of the CD, MD electric hoist maintenance phase did not adopt wrong way ( where is the demand for electric hoist device specification ) , in order to avoid the mistake of lifting injuries caused trouble with the onset of the electric hoist crane control systems to participate in the wrong phase maintenance , and when the attack phase power supply or the wrong phase, since the wrong phase maintainer effect , so that the total power contactor is disconnected , it is necessary to be recovered to normal after the power supply crane caliber continuous operation . This can lead to wrong phase to avoid power winch , motor phase and avoid job is burned. Therefore, dislocation maintain the effect of the phase is very solid .

Electric hoist during operation , because the wheel rim and wheel tread wear , the wheels and the track gradually increase the gap , if not timely conditioning running at the moment the gap , electric hoist can lift themselves out tracks , forming lifting injury incidents ; together because the wheels device orientation particularity axle , axle attack is difficult to detect the crack , the crack can not be useful for manipulation , axles capable of cracking attack , causing trouble falling . To avoid electric hoist thus formed the onset of fall incidents can be a suitable hoist off-axis orientation of additional anti- maintenance equipment , when the hoist derailed or broken shaft , the anti- broken shaft maintenance of equipment can usefully be hung on a track , and then avoid lifting the onset of injury incidents . In accordance with GB6067-1985 " crane safety regulations " rule, the electric hoist operation is necessary to install a terminal trajectory buffer , but there is no specific rule on the installation position . China's current domestic use of electric hoist mounted on the bumper beam is usually the center of the wheel when the hoist operation phase bump the buffer , the buffer effect of absorbed energy to play . But because of the layout of the particularity of electric hoist , running wheel rim when the buffer bump , under the effect of inertia , the wear of the wheel rim so that the buffer is extremely grim, when the electric hoist operation for some time, the buffer will lose the original some depict function, then the electric hoist unsafe elements added during operation , power hoist the smooth functioning drastically reduced . To avoid the problems of rendering buffer device orientation can be selected in the I-beam under the appearance , the use of buffers with electric hoist hanging ear plates bump cushion effect winning usefully extend the use life of the buffer .

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