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BR1 BR2 BR3 Series Middle-low Air Pressure DTH Hammer

Middle-low air pressure DTH hammer ​BR1 BR2 BR3 series DTH hammers are designed to operate efficiently at low air pressures and medium air pressures, using BR series bits.

Middle-low air pressure DTH hammer

BR1 BR2 BR3 series DTH hammers are designed to operate efficiently at low air pressures and medium air pressures, using BR series bits.

The main features are as follows:

1.The operation air pressures are between 0.7Mpa to 1.75Mpa;

2.Valveless hammers;

3.Simple structure, easy to assemble and to disassemble, long life;

4.Higher impact frequency and faster drilling speed;

5.Lower air consumption and lower oil consumption. A hole can be drilled on the check valve to provide more efficient cuttings discharge.

6.Especially suitable for quarrying.


DTH hammer type

BR1

BR2

BR3

Length(less bit)  mm

760

880


889

Weight(less bit) kg

10

14.5

26

External diameter mm

Φ54

Φ62

Φ82

Bit shank

BR1

BR2

BR3

Hole range(mm)

Φ64-76

Φ70-90

Φ90-110

Connection thread

RD40 Box

RD50 Box

API 2 3/8"Reg

Working pressure

0.7-1.75Mpa

0.7-1.75Mpa

0.7-1.75Mpa

Impact rate at 1.4Mpa

27Hz

25Hz

25Hz

Recommended Rotation speed

25-40r/min

25-40r/min

25-40r/min

Air consumption

0.7Mpa

1.5m3/min

2.5m3/min

4.0m3/min

1.0Mpa

2.5m3/min

4.0m3/min

6.0m3/min

1.4Mpa

3.0m3/min

5.0m3/min

8.0m3/min


Breakdown drawing and parts

SN.

Item description

weight(kg)


BR1

BR2

BR3

1

Top sub

1.70

2.60

5.20

2

"O" ring of top sub

/

/

0.01

3

Check Valve

0.1

0.1

0.2

4

Spring

0.05

0.05


0.02

5

Air distributor

0.8

0.6

0.8

6

Internal cylinder

0.8

0.8

1.3

7

Piston

1.20

3.8

5.50

8

External cylinder

4

4.50

9.5

9

Guide sleeve

0.15

0.6

1

10

"O" ring of stop ring

0.05

0.005

0.05

11

Stop ring

0.10

0.10

0.15

12

Drive chuck

0.80

1.20

2.00

13

Drill bits

1.70

2.50

4.00 

1



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