U.S. patent application number 14/362107 was filed with the patent office on 2014-11-27 for air supplying method for cluster hammer having nozzles installed.
This patent application is currently assigned to CHANG SIN INTERNATIONAL CO., LTD. The applicant listed for this patent is CHANG SIN INTERNATIONAL CO., LTD.. Invention is credited to Chang Rok Kim, Chae Goo Lee.
Application Number | 20140345895 14/362107 |
Document ID | / |
Family ID | 46717257 |
Filed Date | 2014-11-27 |
United States Patent
Application |
20140345895 |
Kind Code |
A1 |
Lee; Chae Goo ; et
al. |
November 27, 2014 |
AIR SUPPLYING METHOD FOR CLUSTER HAMMER HAVING NOZZLES
INSTALLED
Abstract
Disclosed is a method for supplying air to a cluster hammer in
which a nozzle has been installed. An air distribution block 1
including an air distribution nozzle 3 formed therein is disposed
under an air inlet cover 4 of the cluster hammer, into which air is
introduced. The hammers 10 are disposed under the air distribution
block 1 respectively. Compressed air which has passed through the
air distribution nozzle 3 is supplied to each of the hammers 10,
and then the hammer 10 is operated. Even when the hammer 10
installed in the cluster hammer is in a flushing position, the
cluster hammer is smoothly operated without creating the problems
in the operation of the other hammers.
Inventors: |
Lee; Chae Goo; (Seoul,
KR) ; Kim; Chang Rok; (Ulsan, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHANG SIN INTERNATIONAL CO., LTD. |
Ulju-gun Ulsan |
|
KR |
|
|
Assignee: |
CHANG SIN INTERNATIONAL CO.,
LTD
Ulsan
KR
|
Family ID: |
46717257 |
Appl. No.: |
14/362107 |
Filed: |
November 7, 2012 |
PCT Filed: |
November 7, 2012 |
PCT NO: |
PCT/KR2012/009297 |
371 Date: |
May 30, 2014 |
Current U.S.
Class: |
173/1 |
Current CPC
Class: |
E21B 4/14 20130101; E21B
41/0078 20130101; E21B 1/00 20130101 |
Class at
Publication: |
173/1 |
International
Class: |
E21B 4/14 20060101
E21B004/14; E21B 1/00 20060101 E21B001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 2, 2011 |
KR |
10-2011-0128456 |
Claims
1. A method for supplying air to a cluster hammer in which two or
more hammers (10) have been combined, wherein an air distribution
block (1) comprising an air distribution nozzle (3) formed therein
is disposed under an air inlet cover (4) of the cluster hammer,
into which air is introduced, wherein the hammers (10) are disposed
under the air distribution block (1) respectively, wherein
compressed air which has passed through the air distribution nozzle
(3) is supplied to each of the hammers (10), and then the hammer
(10) is operated, and wherein even when the hammer (10) installed
in the cluster hammer is in a flushing position, the cluster hammer
is smoothly operated without creating a problem in the operation of
the other hammers.
2. The method of claim 1, wherein water is used as a working fluid
instead of the compressed air.
Description
TECHNICAL FIELD
[0001] The present invention relates to an air supplying method of
a drilling cluster hammer including two or more combined hammers,
and more particularly to an air supplying method of the drilling
hammer which includes a nozzle capable of uniformly supplying
high-pressure compressed air to each of the hammers.
BACKGROUND ART
[0002] In general, a hammer drilling the ground obtains a drilling
force and controls the operation thereof by using air or fluid like
water.
[0003] The structure of an ordinary hammer is disclosed as follows
in Korean Registered Utility Model Publication No. 20-0429346. When
compressed air supplied from the air compressor reaches the air
hammer through the rotary head and the extension pipe, the piston
within the air hammer hits the bit by performing an up and down
repetitive action. Here, the bit breaks plurality of the ground, so
that the drilling is made.
[0004] Here, the components of the used air hammer may include the
chuck, sheath, piston, compressed air distributor, and top sub. The
function of each of the components is as follows. The chuck is
coupled under the sheath and couples the air hammer and the bit.
The sheath surrounds the outer peripheral surface of the piston and
causes the piston to naturally perform a reciprocating action. The
compresses air distributor distributes air to make the piston
perform the reciprocating action. The top sub is coupled on the
sheath and connects the sheath to the extension pipe for supplying
the compressed air to the air hammer.
[0005] Also, in the air hammer disclosed in Korean Registered
Utility Model Publication No. 20-0273989, the drilling bit is
installed in the hollow of the cylindrical housing constituting the
body of the air hammer, the lower portion of the bit includes the
fixed tooth including a plurality of cemented carbide-material made
balls and the magnified tooth assembled outwardly. In a state where
the housing of the air hammer is disposed vertically at a drilling
place, the bit installed in the hollow of the housing is driven. As
a result, not only the fixed tooth and magnified tooth provided in
the lower portion of the head of the bit protrude integrally toward
the lower portion of the housing from the ready state, but also the
magnified tooth is enlarged outwardly due to its own weight. Here,
the bit sprays the high pressure air simultaneously with rotating,
so that the soil or rock layer is drilled.
[0006] Meanwhile, in the cluster hammer including two or more
combined hammers, the air or water fluid is introduced into the
introduction path and is optionally supplied to each of the hammers
through the storage vessel and the internal structure.
[0007] Particularly, in the configuration of the cluster hammer
including the two or more combined hammers, when the lower end of
the hammer does not reach (that is, flushing) the rock or the
ground, i.e., the drilling target due to the collapse of the lower
ground of some of the multiple hammers, and then an empty space is
generated between the lower end and the drilling target, the
compressed air which is supplied to the hammer is flown to the
lower portion as it is. This causes the reduction of the amount of
the compressed air which is supplied to the other hammers, and has
a bad influence on the powers of the other hammers.
DISCLOSURE
Technical Problem
[0008] The embodiment of the present invention is designed to
overcome the above problems. In the embodiment of the present
invention provides a method for supplying air to the cluster hammer
including nozzles for smoothly operating the cluster hammer without
creating the problems in the operation of the other hammers, even
when the hammer installed in the cluster hammer is in the flushing
position.
TECHNICAL SOLUTION
[0009] The embodiment of the present invention provides a method
for supplying air to the cluster hammer in which the nozzle has
been installed. An air distribution block 1 including an air
distribution nozzle 3 formed therein is disposed under an air inlet
cover 4 of the cluster hammer, into which air is introduced. The
hammers 10 are disposed under the air distribution block 1
respectively. Compressed air which has passed through the air
distribution nozzle 3 is supplied to each of the hammers 10, and
then the hammer 10 is operated. Even when the hammer 10 installed
in the cluster hammer is in a flushing position, the cluster hammer
is smoothly operated without creating the problems in the operation
of the other hammers.
ADVANTAGEOUS EFFECTS
[0010] Therefore, the embodiment of the present invention has an
effect that, even when the hammer installed in the cluster hammer
is in the flushing position, the cluster hammer is smoothly
operated without creating the problems in the operation of the
other hammers.
DESCRIPTION OF DRAWINGS
[0011] FIG. 1 is a perspective view of a device for supplying air
to a cluster hammer in accordance with an embodiment of the present
invention;
[0012] FIG. 2 is a view showing that the device for supplying air
to the cluster hammer has been assembled in accordance with the
embodiment of the present invention;
[0013] FIG. 3 is a cross sectional views of the device for
supplying air to the cluster hammer in accordance with the
embodiment of the present invention;
[0014] FIG. 4 is a cross sectional view of an air distribution
nozzle of the device for supplying air to the cluster hammer in
accordance with the embodiment of the present invention; and
[0015] FIG. 5 is a photograph showing an air operation experiment
of the device for supplying air to the cluster hammer in accordance
with the embodiment of the present invention.
[0016] <Description of reference numerals on main parts of the
drawings>
TABLE-US-00001 1: air distribution block 2: air outlet 3: air
distribution nozzle 4: air inlet cover 5 and 6: bolt 10: hammer
MODE FOR INVENTION
[0017] The embodiment of the present invention provides a method
for supplying air to a cluster hammer in which a nozzle has been
installed. An air distribution block 1 including an air
distribution nozzle 3 formed therein is disposed under an air inlet
cover 4 of the cluster hammer, into which air is introduced. The
hammers 10 are disposed under the air distribution block 1
respectively. Compressed air which has passed through the air
distribution nozzle 3 is supplied to each of the hammers 10, and
then the hammer 10 is operated. Even when the hammer 10 installed
in the cluster hammer is in a flushing position, the cluster hammer
is smoothly operated without creating the problems in the operation
of the other hammers.
[0018] Also, water is used as a working fluid instead of the
compressed air.
[0019] The embodiment of the present invention will be described in
detail with reference to the accompanying drawings. FIG. 1 is a
perspective view of a device for supplying air to the cluster
hammer in accordance with an embodiment of the present invention.
FIG. 2 is a view showing that the device for supplying air to the
cluster hammer has been assembled in accordance with the embodiment
of the present invention. FIG. 3 is a cross sectional views of the
device for supplying air to the cluster hammer in accordance with
the embodiment of the present invention. FIG. 4 is a cross
sectional view of the air distribution nozzle of the device for
supplying air to the cluster hammer in accordance with the
embodiment of the present invention. FIG. 5 is a photograph showing
an air operation experiment of the device for supplying air to the
cluster hammer in accordance with the embodiment of the present
invention.
[0020] In the device for supplying air to the cluster hammer in
accordance with the embodiment of the present invention, the air
distribution block including a plurality of the air distribution
nozzles (orifices) formed therein is disposed under the air inlet
cover into which air is introduced. Also, a plurality of the
hammers are disposed under the air distribution block respectively.
The compressed air which has passed through the air distribution
nozzle is supplied to each of the hammers, and then the hammer is
operated.
[0021] Describing the embodiment of the present invention in
detail, air consumption at a specific operating pressure of each of
the hammers No. 1, 2, 3, 4 . . . is determined in advance in the
design of the hammer.
[0022] This is the unique characteristics of the hammer. For
example, a 4-inch hammer consumes (requires) the compressed air of
about 210 CFM at an operating pressure of 200 psi (CFM stands for
Cubic Feet per Minute).
[0023] Also, in the embodiment of the present invention, the
position of a hammer bit is defined as follows.
[0024] The hammering position means that the bottom surface of the
bit comes in contact with the rock (ground) and the hammer normally
operates.
[0025] Flushing position means that the bottom surface of the bit
does not come in contact with the rock, so that the bit is hung
down from the hammer. At this time, this means that the compressed
air supplied to the hammer does not operate the hammer and is flown
to the outside of the hammer.
[0026] The embodiment of the present invention will be described.
An air pressure generator of the embodiment of the present
invention operates one compressor with a capacity of 900 CFM/350
psi.
[0027] An operating method of the embodiment of the present
invention includes each of the hammers in which the nozzle has been
installed. This may be different from the conventional operating
method without the nozzle.
[0028] First, the conventional operating method without the nozzle
will be described. For example, in a case where four hammers are
operated, when the compressed air is ejected from one compressor
with a capacity of 900 CFM/350 psi and is supplied to the each
hammer, the operating pressure of the hammer is 200 psi.
[0029] However, when three hammers normally operate and one hammer
is in the flushing position, the operating pressures of the three
normally operating hammers are reduced to 120 psi, so that a
drilling efficiency is remarkably reduced.
[0030] Meanwhile, unlike the conventional operating method, in the
embodiment of the present invention, when the orifice-shaped air
supply nozzle is installed in each of the hammers, the operating
pressure of the compressed air which is ejected from one compressor
with a capacity of 900 CFM/350 psi and is supplied to each of the
hammers through the nozzle is 200 psi. Here, even when the three
hammers normally operate and one hammer is in the flushing
position, the operating pressures of the three hammers are
maintained at 200 psi.
[0031] Also, in the embodiment of the present invention, the
maximum amount of air passing through the nozzle is determined
based on the amount of air consumption at a target operating
pressure of the hammer, and the diameter Dn of the nozzle is
determined based on the determined maximum amount of the air. The
above-mentioned method for determining the maximum amount of the
air passing through the nozzle on the basis of the amount of air
consumption at the target operating pressure and for determining
the diameter Dn of the nozzle on the basis of the determined
maximum amount of the air is easily performed by using generated
fluid dynamics equations. Therefore, a detailed description of the
calculation will be omitted.
[0032] Also, in the embodiment of the present invention, when the
nozzle is installed as described above, the pressure loss of the
nozzle itself is slight enough to be ignored.
[0033] Accordingly, according to the embodiment of the present
invention, even when the hammer installed in the cluster hammer is
in the flushing position, the cluster hammer is smoothly operated
without creating the problems in the operation of the other
hammers.
* * * * *