Reverse Circulation DTH Hammer

overview

Reverse Circulation Drilling

Reverse circulation drilling is also called central sample collection or double-wall drilling. This type of drilling usually uses a double-wall drill pipe. Drilling force is high wind pressure gas, which enters into the hammer through the gap between the outer pipe and the inner pipe. The hammer hit the drill bit to break rock, and the broken rock is collected into the pores on the drill bit surface, and then the rock samples are collected through the sample collection pipe and the drill pipe.

Advantages

1. No pollution, the reverse-circulation DTH hammer can quickly pick up samples on the drill bit surface at the moment of rock fragmentation. The sample does not need to pass through the hammer length, thus avoiding sample contamination and loss.

2. High productivity. In broken and fractured rock, the penetration speed is superior to the ordinary hammer.

3. Dry samples can be collected even in water condition, because drilling cuttings are collected as soon as they produced on the drill bit surface.

4. High sample recovery. Samples are collected from the drill bit surface, so samples loss can be avoided in broken and fractured rock formations. Since the bit diameter is almost equal to the external diameter of the wear sleeve, the sample collection recovery rate can reach 98%.

Features

1. Simple internal structure, good rigidity of parts, ensuring the long service life and convenient maintenance.

2. Collection tube is an integral type, which can be replaced without removing the hammer. After carburizing treatment, the collection tube is good in wear resistance.

3. With the patented design of the drill bit, it only needs to replace the drill bit. The same hammer can be used for holes of different sizes, and the samples can be guaranteed to be free from contamination.

4. The sampling work can be done well, even under various difficult conditions such as loose soil, hard rock and large amount of water.

Technical Data

Length (bit excluded)	Weight (bit excluded)	External diameter	Hole Range	Working pressure	Impact Frequency	Recommended rotation speed	Air Consumption
1020mm	94kg	99mm	114-127mm	1.0-3.0Mpa	30HZ(1.7Mpa)	25-40r/min	1.0Mpa	1.8Mpa	2.4Mpa
							8m3/min	12m3/min	16m3/min
1111mm	66.5kg	126mm	133-152mm	1.5-3.5Mpa	35HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							16m3/min	22m3/min	28m3/min
1120mm	48kg	100mm	104-120mm	1.0-3.0Mpaa	30HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							8m3/min	12m3/min	16m3/min
1165mm	47kg	107mm	111-127mm	1.0-3.0Mpaa	30HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							8m3/min	12m3/min	16m3/min
1191mm	57kg	109.5mm	113-130mm	1.0-3.0Mpaa	30HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							12m3/min	18m3/min	26m3/min
1191mm	62kg	116mm	120-135mm	1.5-3.5Mpaa	35HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							12m3/min	18m3/min	26m3/min
1208mm	70kg	126mm	133-146mm	1.5-3.5Mpa	35HZ(2.4Mpa)	20-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							16m3/min	22m3/min	28m3/min
1225mm	65kg	124mm	130-146mm	1.5-3.5Mpa	35HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							16m3/min	22m3/min	28m3/min
1227mm	68.5kg	121mm	126-142mm	1.5-3.5Mpa	35HZ(2.4Mpa)	20-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							16m3/min	22m3/min	28m3/min
1250mm	110kg	146mm	155-190mm	1.5-3.5Mpa	28HZ(2.4Mpa)	20-40r/min	1.7Mpa	2.0Mpa	3.0Mpa
							20m3/min	26m3/min	35m3/min
1252mm	52kg	107mm	111-127mm	1.0-3.0Mpaa	30HZ(2.4Mpa)	20-40r/min	1.7Mpa	2.0Mpa	3.0Mpa
							8m3/min	12m3/min	16m3/min
1261mm	65kg	117.5mm	122-135mm	1.5-3.5Mpaa	35HZ(2.4Mpa)	20-40r/min	1.7Mpa	2.0Mpa	3.0Mpa
							16m3/min	22m3/min	28m3/min
1270mm	71kg	124.5mm	130-146mm	1.5-3.5Mpa	35HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							16m3/min	22m3/min	28m3/min
1294mm	84.5kg	130mm	135-150mm	1.5-3.5Mpa	35HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							16m3/min	22m3/min	28m3/min
1320mm	110kg	146mm	152-190mm	1.5-3.5Mpa	28HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							20m3/min	26m3/min	35m3/min
1362mm	80.5kg	120.5mm	124-142mm	1.5-3.5Mpaa	35HZ(2.4Mpa)	20-40r/min	1.7Mpa	2.0Mpa	3.0Mpa
							16m3/min	22m3/min	28m3/min
1362mm	90kg	132mm	136-150mm	1.5-3.5Mpa	35HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							18m3/min	24m3/min	32m3/min
1395mm	185kg	180mm	190-250mm	1.5-3.5Mpa	24HZ(2.4Mpa)	25-40r/min	1.7Mpa	2.4Mpa	3.0Mpa
							28m3/min	38m3/min	52m3/min
1528mm	328kg	240mm	250-370mm	1.5-3.5Mpa	20HZ(2.4Mpa)	15-20r/min	1.7Mpa	2.4Mpa	3.0Mpa
							36m3/min	48m3/min	65m3/min