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 The trailer-mounted drilling rig is divided into mechanical drive, electrical drive and trailer-mounted drilling rig without ground anchor, of which the main characteristics are as follows:
 The drawworks of the trailer-mounted mechanical drive is driven by diesel engine and hydraulic transmission box, which has a proper matching and high transmission efficiency.
 For the electrical drive trailer-mounted rig, the drawworks and rotary table are driven by electrical motors,and the driving control is realized by a digital SCR/VFD system
 These drilling rigs have the following advantages: reasonable structure design, high-integration configuration and they only require a small working space.
 The main unit, drill floor, DP cat walk, generator set, pump set, solid control system, and auxiliary system of this kind rig can all be transported and moved by trailers.
 The drawworks is a double--drum type. The hydraulic disc brake is used as the main brake and water cooling thrust plate pneumatic brake or FDWS brake is used as the auxiliary brake.
 The mast is front-open type, which has a twin-body structure with an inclination angle mode or erective mode and can be raised or laid down and telescoped hydraulically.
 The drill floor has a two-section telescopic structure or parallelogram structure for easy transportation and lifting.
 The mast of the drilling rig without ground anchor is front-open, triple-section and front-inclination type with a height of 154ft, and it can perform triple-setback (columns) round-trip operations. The guyline is fixed on the drilling rig body, which saves disassembly and assembly time and reduces labor intensity.
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