{"id":7375,"date":"2021-09-13T06:31:13","date_gmt":"2021-09-13T06:31:13","guid":{"rendered":"http:\/\/www.condra.co.za\/?p=7375"},"modified":"2021-09-13T06:31:13","modified_gmt":"2021-09-13T06:31:13","slug":"underground-jib-crane-will-recover-spilled-ore","status":"publish","type":"post","link":"https:\/\/condra.co.za\/en\/underground-jib-crane-will-recover-spilled-ore\/","title":{"rendered":"UNDERGROUND JIB CRANE WILL RECOVER SPILLED ORE"},"content":{"rendered":"Condra has designed and manufactured a very large jib crane for bulk recovery underground of ore spilled at an unnamed mine.\r\n\r\nDelivered last week, the 5-ton crane has a lifting height of 9 metres, a slewing radius of 5 metres, and is equipped with an orange-peel grab and electromagnet combination that allows bulk ore to be gathered, lifted and positioned while simultaneously separating out the iron ore within it by means of the electromagnet.\r\n\r\nAfter installation and commissioning at surface level for trials, the crane will play a key role in a prototype ore recovery process. Permanent installation underground will take place after six months of tests.\r\n\r\nThe mine\u2019s surface-level prototype solution comprises five different types of machines working together.\r\n\r\nOre spilled along the conveyor lines will first be recovered by small articulated loaders which will place it on dump trucks for depositing in a purpose-built pit. The jib crane will then retrieve the ore from the pit by means of a combined grabbing, magnetising, lifting, slewing and travel functionality, depositing the ore into a feed hopper from where a secondary conveyor belt will transport it to re-join the main ore stream on its way to the crushing plant.\r\n\r\nThe Condra jib crane is the key to this solution, and has been designed and built to withstand a harsh underground working environment with minimal maintenance. It comprises a pillar-supported double-girder beam topped by the crab-mounted hoist, an arrangement that maximises the grab\u2019s lifting height and optimises productivity in the execution of a repetitive but complex lifting task within the spilled ore recovery process.\r\n\r\n
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Condra\u2019s jib crane for bulk ore recovery underground, shown here at the company\u2019s Johannesburg factory prior to delivery. The five-tine hydraulic grab has an electromagnet to allow bulk ore to be gathered, lifted and positioned while simultaneously separating out the iron ore within it.<\/p><\/div>\r\n\r\nThe crab itself is jam-packed with equipment, holding not only the 5-ton variable-speed-drive hoist, but also the hydraulic power pack, two hydraulic hose reels serving the opening and closing functions of the orange-peel grab, and the cable-reeling drum serving the electromagnet.\r\n\r\nSlewing action is delivered by power from three swivel drives, and limited by rotary limit switches defining and limiting travel extremities.\r\n\r\nThe crane\u2019s lift, swivel and crab movements, and all hydraulic grab and release functions, can be operated by either remote control or back-up pendant.\r\n\r\nCommenting on the newly completed crane, Condra\u2019s managing director Marc Kleiner said that that the large size of the machine and the complex task of designing it to achieve optimal productivity, had excluded most crane manufacturers from competing for the contract.\r\n\r\n\u201cThe jib crane market is very competitive at its entry level or small-machine end, and we do not actively compete in that segment,\u201d he said. \u201cBut as crane size and complexity increases, Condra becomes difficult to beat in terms of engineering and design expertise.\r\n\r\n\u201cWe have worked hard over many years to achieve an ability to align with both end-users and multiple third-party suppliers to deliver the required solution,\u201d he added.\r\n\r\nPrincipal co-suppliers for Condra\u2019s ore recovery crane were Rec-O-Quip, which designed the overall multiple-machine concept process, and MMH Recycling Systems which supplied the five-tine hydraulic grab.\r\n\r\nAsked about Condra\u2019s future plans for the jib crane market, Kleiner said that increasing manufacturing efficiencies within the production process for this type of crane would make the company more competitive in bids for smaller, standardised designs.\r\n\r\n

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Final assembly of the crab at the top of the jib crane, with the 5 ton hoist itself (green, central), hydraulic power pack behind the hoist, two hydraulic hose reels (between power pack and hoist) serving the five-tine orange-peel grab, and the cable-reeling drum serving the electromagnet (foreground).<\/p><\/div>\r\n\r\n\u201cThese efficiencies will also reinforce Condra\u2019s position as the manufacturer of choice for large jib cranes such as the machine just completed,\u201d he said.\r\n\r\nFurther jib crane orders are anticipated.\r\n","protected":false},"excerpt":{"rendered":"Condra has designed and manufactured a very large jib crane for bulk recovery underground of ore spilled at an unnamed mine. Delivered last week, the 5-ton crane has a lifting height of 9 metres, a slewing radius of 5 metres,…","protected":false},"author":4,"featured_media":7376,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7375","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","entry","has-media"],"_links":{"self":[{"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/posts\/7375","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/comments?post=7375"}],"version-history":[{"count":1,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/posts\/7375\/revisions"}],"predecessor-version":[{"id":7386,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/posts\/7375\/revisions\/7386"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/media\/7376"}],"wp:attachment":[{"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/media?parent=7375"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/categories?post=7375"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/tags?post=7375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}