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What are the limitations of current rock breaking technology in mines?
Release time:
2022-11-07
Author:
Source:
What are the limitations of current rock breaking technology in mines?
- What are the limitations of current rock breaking technology in mines?
(1) Water jet rock breaking technology mainly uses "water wedge action" to break rock. The most common form of pure water jet type, its structure is simple, easy to maintain, but this form of water consumption, often lead to rock excavation machinery workplace produce a lot of water, resulting in equipment is difficult to work. The effect of pulse jet is better than that of pure water jet when the rock is repeatedly loaded with stress at a certain frequency, but the generation form and device of pulse jet are still problems to be solved. For special conditions, adding abrasives to pure water can greatly increase the impact crushing capacity of the jet, reduce water consumption, and reduce the pressure of the jet system, but the abrasives cannot be recovered, resulting in increased rock crushing costs and increased nozzle wear., Reduce the service life. By adding cavitations in the pure water jet, the collapse of cavitation on the rock can improve the rock breaking ability of cavitation jet, but the form of cavitation in the nozzle still needs to be optimized, and how to solve the cavitation of cavitation on the nozzle needs further research. In addition, high-pressure water jet technology has been maturely applied in the field of coal seam slotted pressure relief technology, but this method cannot be used as a separate means of rock breaking.
(2) Water jet assisted mechanical crushing of rock is of practical significance, the combined effect of water jet impact and mechanical tool to reduce the mechanical tool temperature and cutting load, improve the efficiency of tunneling has a significant effect, its in coal mining, roadway excavation, tunnel engineering and oil drilling and other fields to carry out a lot of research and application, the method has been mature applied to coal and semi-coal rock crushing. Although the relevant research and application of water jet assisted drill bit and hob have been carried out for hard rock crushing, due to the extremely high jet pressure required in the hard rock crushing process, the reliability of the rotary sealing device in the actual field application process is low, and the high pressure can not be effectively sealed for a long time. At the same time, the high-pressure jet requires high power, high energy consumption, nozzle blockage, wear and other problems, maintenance costs are too high, so the technology has not been widely used in hard rock roadway tunneling engineering practice.
(3) The expansion crack auxiliary rock breaking technology uses the rock pre-drilling, and then breaks the rock through the expansion crack device. The existence of rock pre-drilling weakens the overall stress of the rock and provides a free surface for the rock breaking work of the expansion and cracking device. For mechanical expansion and cracking rock breaking, it has simple structure, good crushing effect on hard rock, no thermal stress, no dust, low noise and little damage to surrounding rock during rock breaking. However, a single mechanical expansion and cracking rock breaking device has low efficiency and should be used in combination with an automatic drilling and expansion integrated machine. The water and foam generated in the rock breaking process of high-pressure hydraulic expansion and cracking technology can suppress dust concentration, consume less water, and the rock breaking device can be reused, however, it still needs to be used in combination with the drill-up all-in-one machine. High-pressure gas expansion and rock breaking technology adopts non-explosive gas expansion and rock breaking. No harmful gas is generated during rock breaking. Rock breaking has high energy and controllable energy, but dust and noise are large. Gas compression and storage devices are required.
Source:Research Progress of Mine Coal Rock Breaking Method
Key words:
Current, crushing, rock, jet, device, technology, machinery, water jet, generation, process
