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Development of DTH hammer
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DTH hammer is divided into a valved air distribution hammer and a valveless air distribution hammer according to the type of the gas distribution device. press The number of pistons is divided into a single piston hammer and a multi-piston hammer. The air pressure is divided into high wind pressure hammer according to the use wind pressure , a medium air pressure hammer and a low wind pressure hammer. But in any case, it's about a purpose, so that the maximum drilling efficiency is achieved with the minimum energy consumption. The purpose of the engineering and technical personnel in China is to A great deal of research has been done and a great deal of results have been achieved. so that a large number of different specifications and models are generated, Hammer device with the same purpose and different characteristics.
1. Through reverse circulation impactor: it is equipped with double wall drill pipe for reverse circulation continuous coring drilling, which is used in ore exploration, engineering geological survey and other fields. It effectively solves the problems of drilling, coring, wall protection, high cost and long cycle in sand gravel complex formation. This drilling method can be used in hydrological and well drilling, which can fundamentally solve the problems of slag discharge, coring, hole pollution and slag blockage of aquifer, affecting the amount of water and so on.
2. Concentric casing system hammer: follow up the wall guard pipe at the same time as the impactor drilling. It solves the drilling problem in soft formation, soil rock formation or other complex and easy to collapse formation. Concentric casing system hammer can be divided into two different forms: concentric casing system with blocks and symmetric overburden drilling equipment. According to the high and low wind pressure, it can be divided into two different forms: high wind pressure casing tubes drilling and low wind pressure casing tubes drilling.
3. Combined DTH hammer:The combined hammer is made up of several hammers bundles, and the maximum drilling diameter can reach 1524mm.
4. Reverse DTH hammer: In the anchoring industry, anchoring pipes are pulled out in most cases. Reverse hammer uses the impact force of the impactor to vibrate and anchor the pipe and pull out the pipe at the same time. This device is also called vibration extubation. Compared with static extubation, it saves 3/4 effort and greatly reduces the cost of extubation. The development of everything has a process of gradual evolution, but there is also a sudden change. For example, the first generation hammer is welded structure, and the second generation hammer is changed to assembly structure. The second generation is valve structure hammer, the third generation is changed to valveless structure hammer. But at the same time, there is inheritance between different generations of hammer. The brazing bit of the fourth generation impact is interchangeable with that of the third generation hammer. It is only that the brazing bit of the fourth generation hammer removes the brazing tail pipe of the third generation hammer.
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