Water Based Polyurethane Resin Mutiple Using Water Based Resin,Water Based Polyurethane,Silica Powder For Water Based Polyurethane Resin Guangzhou Quanxu Technology Co Ltd , https://www.skyelecteflonheater.com
Mining work of stage mining method
When using the stage mining method of horizontal deep hole ore mining, if medium-deep hole ore is used, the rock drilling and blasting work is carried out on the platform and the hanging plate in the rock drilling patio. The minimum resistance line is 1.6~2m. In order to avoid the secondary crushing and dirty airflow affecting the rock drilling work, under normal circumstances, after all the blastholes in a mining room are drilled, the blasting is carried out in several stages. If the YQ-100 drilling rig is used to drill deep holes, the rock drilling and blasting work is carried out in the rock drilling chamber in the courtyard of the room pillar, and the minimum resistance line is 2.5-3.5 m. The diameter of the diverticulum is 3.5 to 4 m. When drilling a row of deep holes, the height of the diverticulum is 2 to 2.2 m, and in the case of two rows, the height is 2.8 m. The upper and lower rock chambers are staggered, and the deep holes can be charged by manual charging or charging, and detonated by a differential electric detonator and detonating cord system or with a non-conducting squib system. The first blasting, due to the lack of space for the bottom and the need to protect the stability of the bottom column, generally first blast 1 to 2 rows of deep holes. Gradually increase the number of blasting rows later. The ore that has collapsed in each blast can be released completely, and it can be temporarily retained in the mine to regulate the mineralization. Scraper ore general use, winch capacity of 28 ~ 55kw, harrow volume of 0.3 ~ 0.5m 3, may also be employed loaders (or scraper) or vibrating the ore mining machine.
When adopting the section rock drilling stage mining method, the mining method is very similar to the section mining method. The difference is that the ore in the section rock drilling stage is directly discharged from the stage level, and the section is segmented. Each part of the mining method has an independent mining system; the stability of the ore is higher than that of the section mining method; the inclination of the ore body must be steeply inclined.
When adopting the stage rock drilling stage mining method, drilling deep holes of ф110～130mm at the top of the mine or drilling deep holes at the bottom of the mine, the ore falling at the full height of the stage can significantly reduce the mining workload. The arrangement of rock drilling roadway is relatively simple, and it is concentrated on one level. Therefore, it is convenient to erect and move the deep hole drilling rig , and the charging blasting work is also labor-saving. The vertical deep hole blasting has less destructive power to the bottom column, which is beneficial to the bottom column. Maintenance. However, the ordinary deep hole drilling rig is not perfect, the deep slope of the deep hole of the drilling is large, the blasting effect is not good, and the large block rate is high, which affects the mining efficiency. In foreign countries (USSR), in order to improve the mining efficiency of the method, the vertical deep hole matching vibrating mining machine is used for testing and popularization, and the vertical deep hole is matched with the flat bottom structure to self-equipment, which has achieved good technical and economic effects. From the 1970s to the 1980s, the United States and Canada, the large-diameter down-the-hole drilling rigs used in open pit mines were changed to narrow-type self-propelled down-the-hole drilling rigs for underground mine applications, such as ROC-306, CMM-1, CMM-2. Wait. These rigs are used to drill down deep holes. The hole diameter is 150-165mm, and the hole depth can reach 60-90 or even 110m. Due to the use of more advanced stabilizer guide and supercharger to increase the pipeline wind pressure to 1.1 ~ 1.8MPa, and use gas-water mixed fluid or dust collector to remove dust, it can control the large-diameter deep hole slope less than 1%, to ensure The accuracy of the drilling has been improved, and the drilling speed and efficiency have been improved, and the working conditions have also been improved.