or “plum blossom spots”, single-head large-caliber DTH hammer is used.
Tables 11.1 and 11.2 are the product parameter tables of single-head large diameter
pneumatic DTH hammer and CD series cluster DTH hammer of Ingersoll-Rand
Company, respectively.
South Korea Dongyu Machinery Company has been producing small DTH and
deep DTH hammer drills for groundwater and hot spring development since 1990,
and has successively introduced large-caliber DTH hammers. Its large diameter
pneumatic DTH hammer products include D. W410, D. W750 and CD series of
cluster DTH hammer. The product parameters of D. W410 and D. W750 DTH
hammers are shown in Table 11.3. Each type of DTH hammer has three kinds of air
supply pressure: low, medium, and high. Among them, the low wind pressure of D.
W410 pneumatic DTH hammer is 10:5 kgf=cm
2 , the consumption of air is
Fig. 11.5 800 mm large diameter pneumatic DTH hammer and matching bits imported from
Japan
Table 11.1 Parameters table of Ingersoll-Rand large diameter pneumatic DTH hammer
Model
Air consumption (m
3 =min)@wind
pressure (kg/cm
2 )
External
diameter
(mm)
Length
(mm)
Weight
(kg)
Aperture
(mm)
Low wind
pressure
Medium
wind
pressure
High wind
pressure
DHD112W
15.3@5.6
28.4@10.5 51.1@17.5
276
1933
598
302*455
DHD112WS 15.3@5.6
28.4@10.5 51.1@17.5
276
1933
674
302*455
DH12
35.5@10.5 52.4@14
65.2@17.5
276
1933
583
302*455
DH11
35.5@10.5 52.4@14
65.2@17.5
254
1933
561
297*445
DH12S
35.5@10.5 52.4@14
65.2@17.5
276
1933
660
508*559
PPD112 L
23.4@7
–
–
276
3200
904
302*445
PPD112 LS 23.4@7
–
–
276
3300
987
508*559
QL200
70.6@10.3 96.1@13.8 124.3@17.2 396.2
1671
816
660*762
11.2 Principle and Classification of Pneumatic DTH Hammer
203