1、英文原文 Discussion on key technology of mine boom type heavy roadheade Abstract:Thepaperproposed the key technological issues of the hard rock cutting for themine boom type heavy roadheader. In combinedwith the research and developmentof theEBZ300TYmineheavy roadheader, the paperdiscussed the technical
2、measuresmade. Accordingto the certain geological conditions of the client, the proposed the alternatives on the rationalmatching of theworking parameters, the cut-terimprovementdesign direction, the selected type cutting head, the stabilization and layout of the roadheader, the development of thekey
3、 parts, the orientation position, the face cross sectionmonitoring and others. Key words:mine heavy roadheader； hard rock cutting； key technology Cantilevered boring machines have made expressfrom 1960s during the 20th centuryinChina, with continued research, testing and improvement in recent 50 yea
4、rs, the performance of machine has increased: cutting power range from 50kWto 220 kW, from light to heavy-duty models of the more than 20 kinds of products, in the coal mine coal and semi-mechanized coal-rock tunnel boring widely used in China in recent years to meet the basic the rapid development
5、of the coal industry needs. Along with the mine working face size and the continuous improvement of production, the modernization of a large number of million-ton mine-building, especially the construction of new wells in the rock to open up the roadway, on whole-rock boring machine demand increases
6、 every year, its technical capabilities and requirements for continuingraised. The development of cutting power reaches 300 kW, the machine to adapt to the quality of over 100t roadway section 30 50 m2, cutting of rock uniaxial compressive strength reached 120MPa heavy hard rock boring machine, it i
7、s in growing demand and rapid advancement of technology boring machine made under the premise. With the development of the past 50 years compared to the boring machine, it is not a simple local improvement, nor is it a successful model of the past, zoom in or out, boring machine technology but a far
8、-reaching changes in many aspects. This is because some of its key technologies will be applied to other products on the boring machine, boring machine and then bring the whole technology industry. The following boring machine at home and abroad according to the present developments and the developm
9、ent experience of heavy hard rock boring machine for cutting the key technologies are discussed. Cutting capacity 1 Cutting capacity is heavy hard rock boring machine restricted the use of the most important factor in the development of heavy-duty boring machine at the heart of the level of their ab
10、ility are usually measured by three indicators, namely, tooth loss cut-off rate (to / m3), production capacity (m3 / h) and cutting energy consumption than the (kW h/m3), which cut the rate of tooth loss is more decisive role. Cutting in hard rock boring machine, if the hardness of rock, or grinding
11、 teeth of a strong lead to the actual loss rate cut more than 1 / m3, then they would pick as a result of consumption of high cost and frequent replacement of the cutter and machine vibration increased increase in maintenance costs compared with the drilling and blasting method becomes uneconomical.
12、 Therefore, heavy boring machines ability to adapt to cutting hard rock cutting is essential, for this body of work needs to choose the parameters, the type of cutting head and cutting tool, such as an in-depth study. 1 1 operating parameters of a reasonable match with the performance prediction Cut
13、ting in the process, and one of the most important parameter is the most basic cutting thickness (coal cutter rock cutting depth), and the rock cutting nature of the cutting is not suitable thickness will reduce cutting efficiency and Pick of the wear and tear, resulting in more dust. Different cut-
14、off in the rock structure, the formation of different mechanical properties. Because of the specificity of cutting hard rock, hard rock boring machine during the design, user-specific nature of the geological conditions of rock parameters for the selection and matching of heavy hard rock boring mach
15、ine is designed to correct the premise. In the different rock types, such as strength, abrasion, and rock types, such as cutting tests conducted on the basis of the combination of dedicated design software for cutting optimization of operating parameters of the design, hard-rock boring machine is cu
16、tting to achieve high performance the only way . In addition, the design parameters for performance prediction of the success of the use of boring machine is an important factor. According to research institutions abroad, the research results 2, can be forecast according to certain formula for the c
17、ut-off rate of tooth loss and to predict cutting capacity. Will be by way of cutting the rock compressive strength, cutting power, boring machine weight, diameter of cutting head as the standardization of parameters such as parameters. Come to the conclusion that the hardness in cutting when the cut
18、ter reached 120MPa consumption rate of a more economical level. 1 2 tool to improve the design The last 50 years, researchers in order to improve Cutting capacity rock tests done a lot of research, such as increasing the weight of the machine, the design of solid rack, a big increase in power, such
19、as cutting. Test shows that the constraints of the main factors driving hard rock is still the pick, as the cut-off performance is good or bad teeth, the length of life boring machine a direct impact on the economy, thus cutting the need for an in-depth study tool. At present, the extensive use of b
20、oring machine with cone-shaped alloy head pick-ho, as they have since the blade and impact resistance and have been affirmed, in a variety of boring machine has been widely used and become standardized. In addition, through the introduction of new welding technology, increasing the diameter of the f
21、irst alloy and improve abrasion resistance, such as cut-off method of tooth roots, pick a larger improvement in the durability of cutter. Despite the ho-shaped cutter to carry out an in-depth research, manufacturing process has been greatly improved, but still can not economically stronger for grind
22、ing of hard rock mining. This is because when the ho-shaped cutter with the rock when the contact area, and in the higher stages of wear and tear become blunt and sharp teeth, the posterior horn of the negative, the plane of the wear and tear and extrusion of rock have a lot of rock powder, work to
23、be larger than the energy, cutting efficiency is very low, if the pick-shaped cutter to stop rotating, then the performance of their cutting the rate of deterioration will be increased. Should improve the design tools to enable the transfer to the rock through the tool of power and energy to achieve
24、 maximum value.Recently developed new tools, the United States of Geology, University of Colorado School of Mines Research Institute of the disc machine cutting tool 3, and mining services company in Australia, the development of the era of chain-shaped cutter head alloy. Before the adoption of a ro
25、tary cutting tool for cutting hard rock, due to large size tools and boring machine cutting head size is limited to use； the latter has a cutting tool than the energy stability, the extent of tool use has been a sharp remain unchanged, less dust, vibration small degree block is characterized by the
26、more hard rock boring machine ideal choice, and the use of broad prospects. 1 3 types of cutting head The design of cutting head usually meet the following requirements: tool consumption in small, even by force, good stability, high cutting efficiency. To achieve this These requirements is the main
27、criteria for the design of each tool rotary cutting head in a week can cut the same materials. Practice shows that in the horizontal boring machine, two kinds of longitudinal cutting head type, the horizontal boring machine is more suitable for hard rock cutting 4-5. This is due to cut-off horizonta
28、l cutting head and cut off the small side, at the same time to participate in cutting the number of teeth less than the cut-off, the machine allows the greatest resistance to the same work, they can force the use of larger single-pole； horizontal cutting head cutting line spacing small , can be cut
29、smaller deep, single-tooth cutting resistance on the smaller, the horizontal than the vertical axis of the high hardness cutting； forward open horizontal cut, as cutting edge and are located in traction with the cantilever axis parallel to the plane, you can take full advantage of the weight of the machine, cutting good stability, and pick and Chip of the effect of Better than the vertical axis type.
