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Mission30 Mission40 Mission50 Mission60 Mission80 DTH Hammer

Down the hole hammers are rock drilling equipment which takes compressed air as power source to partially transfer impact power into drilling holes. An air distributing device in a top hammer controls a piston to move back and forth. An impact device arranged in the front of the top hammer transfers the impact powderto a down-the-hole bit to crush rocks.

What is the down the hole (DTH) hammer:

 

Down the hole hammers are rock drilling equipment which takes compressed air as power source to partially transfer impact power into drilling holes. An air distributing device in a top hammer controls a piston to move back and forth. An impact device arranged in the front of the top hammer transfers the impact powderto a down-the-hole bit to crush rocks. 

 

1. Based on previous experience of ordinary hammers, combined with the features of reverse circulation hammer, optimized internal structure and ideal energy transfer, thus ensuring the series of hammers drilling 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  integrative  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 conditions such as loose soil, hard rock and plenty of water exists, sampling can be done well.

 

 How to use the Down The Hole (DTH) Hammer function?

 When percussion or hammer drilling the percussion mechanism is called a DTH or down the hole 

hammer. This drilling tool is located directly above the down hole hammer bit. The driller transfers

weight to the bit through the drill pipe as well as provides some rotation. Through the use of a 

compressor, the pressurized air is forced to the down hole hammer. As the drilled hole gets deeper 

the driller adds more drill pipe to the string. The piston strikes the impact zone of the hammer bit; 

hammers are always used as part of a casing advancement system and can be used in reverse 

circulation applications. DTH hammers are common when drilling blast holes and water wells. 

 

Suitable choice of raw material, advanced processing technology and perfect quality warranty. 

With hardened treatment, drilling life can be extended and then cost can be reduced.

Size range 3’’, 3.5’’, 4’’, 5’’, 6’’, 8’’, 10’’, 12’’ etc.

Shank styles: DHD3.5, DHD340, DHD350, DHD360, DHD380; COP44, COP54, COP64, COP84; 

 

TD40, QL50, QL60, QL80; Mission40, Mission50, Mission60, Mission80; SD4, SD5, SD6, SD8.

 

 

- Valveless air distribution. More reliable.
- Simple design of the piston. Long life.
- More efficient energy transfer, fact drilling speed, lower air consumption and lower oil consumption.
- Fewer internal parts, simple structure, long life, less failure and easier to maintain because all the parts are heat treated.
- Easy to disassemble because the top sub, the drive chuck and the external cylinder are connected by multi-step thread.

 

 The working video: how to fix Mission hammers?

M30 M40 M50 M60 M80 DTH hammer specifications:


M30

M40

M50

M60

M80

Length(less bit)

900mm

1005mm

1110mm

1161mm

1338mm

Weight (less bit)

24.0kg

40.0kg

68.5kg

90.0kg

176.0kg

External diameter

82mm

99mm

125mm

146mm

180mm

Bits shank

M30

M40

M50

M60

M80

Bits diameter

90-110mm
 
 

110-135mm

135-155mm

155-203mm

195-254mm

Connection thread

API 2 3/8" Reg

API 2 3/8" Reg

API 2 3/8" Reg

API 3 1/2" Reg

API 3 1/2" Reg

API 4 1/2" Reg

Air pressure

1.0-1.5Mpa

1.0-2.5Mpa

1.0-2.5Mpa

1.0-2.5Mpa

1.0-2.5Mpa

 

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