Reverse Circulation DTH HammerReverse Circulation DTH HammerReverse Circulation DTH Hammer
Reverse Circulation DTH HammerReverse Circulation DTH HammerReverse Circulation DTH Hammer

Reverse Circulation DTH Hammer

Length: 1020-1528mm
External Diameter: 99-240mm
Hole Range: 114-370mm
Working Pressure: 1.0-3.5Mpa

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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

 

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