Faodar dubhan a roinn ann an dà sheòrsa a rèir an cumaidhean: dubhan singilte agus dubhan dùbailte. Faodaidh iad cuideachd a bhith air a roinn ann an trì seòrsaichean stèidhichte air a 'phròiseas saothrachaidh: dubhan lannaichte, dubhan air an cruthachadh, agus tilg dubhan. An-dràsta, 'S e dubhan singilte a th' anns na dubhan a chithear gu cumanta. Chan eil dubhan tilgeadh ceadaichte airson an cleachdadh air crann. Dubhan […]
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Caractaran so-ghiùlain Tha toraidhean an t-sreath inneal-togail beag beag ann am meud, aotrom ann an cuideam, cruinn, agus air a dheagh structaradh, gan dèanamh gu math so-ghiùlain. Tha na h-innealan-togail sin air an dealbhadh airson a bhith furasta an giùlan timcheall, a tha air leth freagarrach airson diofar làraich obrach. Ge bith an e pròiseact beag ùrachadh dachaigh a th’ ann no obair càraidh sgiobalta air an làrach, an comas giùlain […]
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(1) Requirements for Elastic Base Plates The elastic base plates are made of rubber sheets, and their properties should meet the following requirements: a Shore hardness of 70 – 80 ceuman, a tensile strength greater than 130 kg/cm², an elongation at break greater than 300%, and a compressive elastic modulus of 700 – 1200 kg/cm². […]
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I. Principles for Developing Safety Measures in Crane Operations To ensure that the — Viaduct Mainline Bridge Project is executed strictly in accordance with the approved construction organization design, the hoisting and lifting process is effectively controlled, and all operations conform to relevant operational regulations, this document outlines safety measures with a focus on maintaining […]
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1. Safe Positioning During crane operations, it is extremely hazardous to stand under the boom, beneath the load, in the lifting zone before the object is hoisted, in the triangular area formed by guide pulley cables, around fast-moving cables, or in the direction of tension from inclined hooks or guide pulleys. If an emergency arises, […]
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Section I: Acquisition and Rental of Tower Cranes 1. Purchasing New Tower Cranes To ensure operational safety and compliance, all new tower cranes must be procured from manufacturers with valid production licenses. The following documentation is mandatory upon purchase: Equipment compliance certificates. Warranty certificates for critical components, including high-strength connecting bolts and hoisting wire ropes. […]
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To ensure that gear reducers pass factory testing, it is essential to address the issue of intermittent high noise levels. Tests using the ND6 precision sound level meter indicate that low-noise gear reducers register 72.3 dB(A), meeting factory standards, while high-noise gear reducers reach 82.5 dB(A), failing to meet the requirements. Through repeated testing, analysis, […]
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The installation of crane tracks is a crucial process that ensures the proper alignment and operation of overhead cranes. The following detailed steps outline the installation procedure: 1. Line Marking Using the crane girder’s positioning axis as a reference, deploy a theodolite to establish baseline points. At a distance of 60mm from the track centerline, […]
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Introduction Grounding is an essential aspect of crane safety, ensuring the protection of both personnel and equipment from electrical hazards. Proper grounding mitigates the risks of electric shock, fire, and equipment damage by providing a reliable path for electrical currents to flow safely into the earth. This guide provides a comprehensive overview of grounding requirements […]
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Introduction Beam cranes are one of the most widely used types of lifting equipment in industrial and construction environments. They are characterized by their ability to move loads horizontally along a pair of rails or a single track. This guide provides an in-depth exploration of the types and structures of beam cranes, including their operational […]