翻译英文原文Gas drainage drilling rigBritish Coal Office owned coal mine in the early 1950s to the mining area of a nearby gas drilling drainage, and now are very small compared to the scale. Flow into the roadway in the gas pressure was general-in ventilation system ruled out. This article will introduce some modern mining technology with the development of the rig. When the increase in coal production, coal face promote optimum fast, high concentration of gas to be ruled out, this will lead to modern gas drainage system development, that a regional gas drilling, drilling connect to the pipeline system, Reply to the surface of gas will be excluded. About 40 to 50 years ago, the British-made drilling rig not a satisfactory. British drilling rig equipment companys decision to meet this requirement. In recent years the design and development work in the United States Department of State Coal help a large number of staff, consultation and cooperation. The successful development of the EDECO Hydrack series rig, the rig used for five years until 1963 the introduction of the new design series Hydrack EDECO micro-drilling rig. This is now the use of the rig, designed after the reform of the review.Drill DesignHydrack gas drilling rig is the first for the electro-hydraulic drilling rig, the rig before most of the air-powered. Drill pipe and bit by a hydraulic motor through the rotating six-speed gear box; to be thrust into power and the trip from 815 mm to achieve the hydraulic cylinders, with rack and pinion system to process will be carried out twice. About the most torque 949 Nm, a way to about 1702 mm bit on the effective thrust of about 2,794 kg. Diameter drill pipe design for the 60.3 mm, for the 1524 mm long with a cone-shaped male connector, commonly known as EF / N-type drill pipe. 1963, the design of the micro-Hydrack rig. This is a very short period of Qinger drilling rig, his trip to 851 mm. A three-speed gear box, the largest of its torque to 691 Nm, effective drilling thrust 2,145 kg. Design drill pipe smaller diameter of 41.3 mm, length of 762 mm, also with cone-shaped male connector, called ET / A-type drill pipe. ET / A-type and the initial ET / N-type drill pipe is the drainage of two standard gas drilling equipment, including in the United Kingdom is now No. 613/1974 of the Ministry of Coal samples. Hydrack drilling rig is installed by the group composed of standard parts; Drill - a rack with skateboards, skateboards support. Bit installed in the sliding seat, by the hydraulic motors, Biansuchilun me and thrust as well as sets of component supply rotary joint. On the rack, slide under the hydraulic cylinder. Bored end of the rack-oriented holder used to support the drill pipe and fixed. Power equipment - which is equipped with a hydraulic oil tank, following a slip-ski, makes it easy to transport. A motor and hydraulic pump and other auxiliary equipment, such as the return to the oil filter, safety valve, and pumps, tank airway and humidity safety switches are installed in the fuel tank above. Control panel - the smallest of the four devices. Bored functions include the control valve, pressure gauge and the instructions of torque on the drilling bit pressure. Rack assembly - when the preparations for drilling, rack supports drilling rig. Rack to adapt to a variety of different forms of drilling terrain changes, H-rack, A-frame and single-bearing pillars. The latter two are based drilling rig users to the requirements of the design. Hydraulic oil through hydraulic flexible hose from the power plant station transmitted to the control panel and then into the rig. General long hose 4 m, to adapt to the positioning devices.Gas DrainageCoal mining, will cause gas from coal mining and coal mining neighbouring not Xiechu. In the United Kingdom in the mine, gas outburst 100 years of history. Gas outburst be an explosive mixture, the lack of oxygen, or the top end of the dramatic movement, and dangerous situation. In mine, now control the gas is to play with coal gas drainage drilling, drilling into the tunnel roof or floor seam. Bored are connected to each pipeline system (known as the steel tube inserted into the borehole ducts and risers), with gas pumps will be out of the ground. Individual pumping gas drilling pure放量consecutive months can be as high as 200 feet 3 / min. Most of the use of tungsten carbide or the rotating cone drill bit bored.Design considerationsMost of the projects are designed with a compromise on an issue of general there are a number of answers, but no one is the ideal answer. Design of gas drainage drilling rig should consider the parameters: As a complete drilling, drilling rigs need to move to a new location. So should the weight of the lightest rig. When the drilling rig in the mine at the time of installation in the roadway should be left as many as possible to facilitate the work of the space and equipment to use. Mine mechanica