For a tunnel boring machine (TBM), the cutter rockbreaking effect and mechanism are key components of the machine design and construction. Each cutter on the TBM cutterhead is affected by adjacent cutters and exhibits different rockbreaking effects under different rockbreaking sequences. Considering the influence of two adjacent cutters, the target cutter has three rockbreaking sequences ...
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WhatsApp: +86 18838072829When the pipe jacking machine advances in the coal rock formation, the spinning cutterhead drives the disc cutter to break the coal rock. To realize safe and efficient tunneling of collapsed coal rock formation by pipe jacking machine, it is important to study the factors affecting the coal rock breaking effect of the disc cutter.
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WhatsApp: +86 18838072829One feature of the invention is a coal breaking machine of the type specified comprising a screen, a lower toothed breaking element the teeth of which are arranged to penetrate the screen, and an upper breaking element arranged to press upon and break coal that rests upon the top of the teeth of the lower element while they project above the ...
WhatsApp: +86 18838072829: The Continuous Mining Machine. A picture is worth a thousand words. so, let's look at the front of a continuous miner. The cutting drum is about 2' in diameter and perhaps 12' wide. It is laced with carbide cutting bits, and the drum rotates at about 1 revolution per second. The cutting head is sumped into the top of the seam ...
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WhatsApp: +86 18838072829Study on shearer drum structure design and coal‑breaking performance based on multi‑impact picks for hard coal Qiang Zhang1,2 · Cong Wang1,2 · Ying Tian 2 ... expansion technology of expansive agent and coal mining machine to break hard rock. The mining results showed that the hard rock mass after expansion and cracking can reduce
WhatsApp: +86 18838072829The technology of increasing coal seam permeability by highpressure water jet has significant advantages in preventing and controlling gas disasters in lowpermeability coal seam. The structural parameters of a nozzle are the key to its jet performance. The majority of the current studies take strike velocity as the evaluation index, and the influence of the interaction between the nozzle's ...
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WhatsApp: +86 18838072829Abstract: This paper aims to design a suitable method to analyze the relationship between the rockbreaking performance and tunneling performance of the cutters of tunnel boring machine (TBM). Considering the cutting discontinuity in broken coal rock formation, the authors put forward a simulation method for the rockbreaking performance of TBM ...
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WhatsApp: +86 18838072829PDF | On Feb 8, 2021, Linnik and others published ASSESSMENT OF RELIABILITY OF COAL MINING MACHINE CUTTERS | Find, read and cite all the research you need on ResearchGate
WhatsApp: +86 18838072829Rocks breaking in mines during the mining and clearing activities is conducted by special coal mining machines; their working bodies are equipped with cutters. The cutters are placed on the coal ...
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