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05
2019-08
05
2019-08
09
2019-05
Beneficiarymining-Research on Prediction Method of Directional Borehole Trajectory in Coal Mine
Abstract: (Abstract): In view of the problems that the three-point fixed circle method does not consider the force deformation of the drilling tool and the related parameters of the vertical and horizontal bending beam method are difficult to obtain in the traditional drilling trajectory prediction method, a new method of coal mine directional drilling trajectory prediction is proposed, which uses the vertical and horizontal bending beam theory to improve the three-point fixed circle method. According to the theory of vertical and horizontal bending beam, the method analyzes the force of the single-bending screw drill assembly, derives the three-bending moment equation, obtains the second span length L2 formed after the bending deformation of the drill assembly, and substitutes the three-point circle method, calculates the predicted slope of the drill assembly under different force conditions, and realizes the directional drilling of the coal mine near-horizontal kilometer.
2019-05-09
10
2018-07
Rotary digging machine drill pipe correct cleaning method
When cleaning the drill pipe of the rotary excavator, we must first understand the cause of the sediment at the bottom of the hole. 1. Residue between bucket teeth of rotary drilling rig and bottom cover of drilling bucket. 2. The bottom cover is not closed tightly. 3. When drilling into mud and sand and flow plastic formation, the drilling slag in the drilling bucket is seriously lost during lifting, and sometimes even all of it is lost in the drilling hole. 4. The soil cut by the edge of the outer edge of the drilling bucket of the rotary drilling rig remains at the edge of the bottom of the hole because the bottom of the hole is a plane that cannot enter the entrance of the cylinder. 5, drilling bucket teeth are sparse arrangement, leakage between teeth is inevitable. 6. The return footage of the drilling bucket is too large, the loading is too full, and the muck is squeezed out from the drainage hole of the top cover. According to the rotary drilling machine method, we
2018-07-10
10
2018-07
Correct Cleaning Method of Drill Pipe of Rotary Digging Machine-Yikuang Technology
When cleaning the drill pipe of the rotary excavator, we must first understand the cause of the sediment at the bottom of the hole. 1. Residue between bucket teeth of rotary drilling rig and bottom cover of drilling bucket. 2. The bottom cover is not closed tightly. 3. When drilling into mud and sand and flow plastic formation, the drilling slag in the drilling bucket is seriously lost during lifting, and sometimes even all of it is lost in the drilling hole. 4. The soil cut by the edge of the outer edge of the drilling bucket of the rotary drilling rig remains at the edge of the bottom of the hole because the bottom of the hole is a plane that cannot enter the entrance of the cylinder. 5, drilling bucket teeth are sparse arrangement, leakage between teeth is inevitable. 6. The return footage of the drilling bucket is too large, the loading is too full, and the muck is squeezed out from the drainage hole of the top cover. According to the rotary drilling machine method, we
2018-07-10
26
2018-02
Shandong coal mine safety has reached the level of developed countries
In the past five years, the number of accidents, the number of deaths, and the death rate of one million tons in Shandong coal mines have all dropped significantly. As of November, Shandong has had no major accidents for 35 consecutive months and no major accidents for 76 consecutive months. Since 2013, the death rate of one million tons of coal mine has remained below 0.1. Shandong coal mine safety has reached the level of developed countries. According to statistics, in 2011, there were 13 accidents in Shandong coal mines, 46 people died, and the death rate per million tons was 0.3; in 2012, there were 15 accidents, 30 people died, and the death rate per million tons was 0.2; and in 2016, the province's coal
2018-02-26
26
2018-02
Seasonal demand peaked at steam coal prices under downward pressure
Recently, the 1801 contract of thermal coal futures rebounded relatively strongly, once breaking the important pressure level of 620 yuan/ton. In contrast to the futures market, the in stock market was flat. The author believes that the seasonal peak summer has passed, the demand for civil electricity will decline, and the industrial electricity consumption is also lower than in previous years. Meanwhile, coal supply is picking up. The downward pressure on thermal coal prices is greater. The seasonal demand for civil electricity peaks. From the seasonal changes in the demand for thermal coal, there are two peak demand seasons for thermal coal each year, one is the peak summer from July to August, and the other is the heating season in winter. From July to August, due to the hot weather, the demand for civil electricity
2018-02-26
26
2018-02
Although coal prices rise, the road is still long.
Today, coal prices have bottomed out after four years of sharp decline. Some friends think that the price has risen, the industry has got out of trouble, and coal is on fire again. How to understand the current situation and how to face it is indeed a question worth thinking about. First look at the reality of the situation, coal prices rose on the industry to recover? At present, coal prices from the beginning of 2016 of 370 yuan/ton after a year of rebound to 580 yuan/ton, just a year or so up 56.8 percent, have to say that coal prices rose a bit fast. However, it must be rationally seen that the current coal price lasts less than a year compared to the industry's four-year downturn.
2018-02-26
