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Home > Products > DTH Drilling Tools > DTH Hammer > Reverse Circulation DTH Button Bits

Reverse Circulation DTH Button Bits

Basic Info

Model No.:  MIC

Product Description

Model NO.: MIC Manufacturing Process: Forging ODM and OEM: Yes Usage: Coal, Ore, Water Well, for DTH Driller Trademark: BESTLINK Specification: D=140mm HS Code: 82071990 Certification: ISO 9001:2008 Material: High Manganese Steel Condition: New MOQ: 1PC Transport Package: Wooden Box Origin: China RC series reverse circulation DTH Hammer is the latest developed product of our company. It is mainly used for deep exploration drilling and ore grade control.
It has the following characteristics:
1. Based on previous experience of ordinary hammers, combined with the features of recerse circulation hammer, optimized internal structure and ideal energy transfer, thus ensuring the series of hammers deilling with fast smooth and continuous sampling.
2. The internal structure is very simple with components of high rigidity, thus ensuring long life and easy maintenance of the hammer.
3. The collection tube adopts an intergrative design and can be replaced without disassembling the hammer. With carburizing treatment, it has good abrasive resistance.
4. Equipped with bits designed with patent. Simply by replacing the drill bit, the same hammer can drill holes of different sizes ensuring that the sample is not contaminated.
 5. In difficult condition such as loose soil, hard rock and plenty of water exists, sampling can be done well.

Working principle
1. With the piston resting on the percussion bit and the hammer closed up in the drilling position, high pressure air is directed into the bottom chamber of the Hammer and the piston lifts. This commences the piston cycle.

2. As the piston travels upwards it forms the top chamber by forming a seal with the inner tube and the ID the piston. Further movement seals the port that feeds the bottom chamber and also simultaneously releases the seal on the bottom chamber allowing the air to expand and exhaust down the splines of the percussion bit. At the same time the Top chamber port is opened which feeds the high pressure air into the previously formed top chamber thus increasing the pressure above the piston and forcing it back down.

3.During the down cycle or power stroke the piston reseals the bottom chamber on the piston bearing bush thus stopping the exhaust air and creating a chamber of high pressure air below the piston which forces the piston back up the hammer.

4. Lifting the hammer of the bottom of the hole allows the percussion bit to slide down the drive sub also allowing the piston to slide down the hammer and rest on the piston bearing bush. The piston strike face and the strike face of the percussion bit can now not come into contact thus allowing the free flow of high pressure air directly through the hammer without the hammer cycling.
DTH Hammer Type HRC45 HRC55 HRC65 HRC52 RC542 RC543 RC545 RC547
Length (less bit)  mm 1020 1111 1250 1208 1191 1191 1261 1270
Weight (excluding bit)  kg 94 66.5 110 70 57 62 65 71
External diameter  mm 99 126 146 126 109.5 116 117.5 124.5
Bit shank   HRC45 HRC55 HRC65 PR52 RE542 RE542 RE545 RE547
Hole range  mm 114-127 133-152 155-190 133-146 113-130 120-135 122-135 130-146
Connection thread   upon the thread of the drill tube 3.5"-4" remet
4" metzke
4"-4.5" remet
4"-4.5" metzke
4.5" remet
4.5" metzke
working pressure Mpa 1.0-3.0 1.5-3.5 1.5-3.5 1.5-3.5 1.5-3.5 1.5-3.5 1.5-3.5 1.5-3.5
Impact rate at 1.7 Mpa HZ 30 35 28 35 35 35 35 35
Recommended Rotation Speed r/min 25-40 25-40 25-40 25-40 25-40 25-40 25-40 25-40
Air consumption (m3/min 1.0 Mpa 8 16 20 16 12 12 16 16
1.8Mpa 12 22 26 22 18 18 22 22
2.4Mpa 16 28 35 28 26 26 28 28
Drill Bit Bit Dia.
No. Air
Part No.
HRC 115 2 8x14 8x13 14 HRC45-115
140 2 8x16 8x14 16.5 HRC55-140
165 2 8x18 8x16 19.5 HRC65-165
MIC 133 2 8x16 8x14 17.5 MIC-133
140 2 8x16 8x14 18 MIC-140
146 2 8x18 8x14 20 MIC-146
PR5 133 2 8x16 8x14 12.5 PR5-133
140 2 8x16 8x14 13 PR5-140
146 2 8x18 8x14 13.5 PR5-146
PR4 115 2 8x16 8x13 14.4 PR4-115
127 2 8x16 8x14 15 PR4-127
133 2 8x16 8x14 15.5 PR4-133


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Product Categories : DTH Drilling Tools > DTH Hammer

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