KR101629294B1 - Hammer for drilling - Google Patents

Abstract

The present invention relates to a hammer for crushing and crushing underground rock, and more particularly to a hammer for crushing and rocking underground rock, which comprises an air tube, a piston and a bit, the piston supplying compressed air supplied to the air tube to an upper chamber And the lower chamber moving pipe for supplying the lower chamber located at the lower portion of the piston are separately formed so that the piston is repeatedly moved up and down by supplying compressed air from the air tube to the upper chamber and the lower chamber alternately The present invention relates to a drill hammer.
Therefore, the crush hammer of the present invention has a remarkable effect such that the efficiency of the compressed air is increased even when the same compressed air is used, the high striking energy can be obtained by reducing the loss, and the efficiency of the hammer is very high.

Description

[0001] Hammer for drilling [0002]

BACKGROUND OF THE INVENTION Field of the Invention [0002] The present invention relates to a drill hammer, and more particularly, to a drill hammer capable of maximizing a pressure operating surface of a pneumatic internal pressure of a hammer, thereby achieving a relatively improved performance at an operating pressure of the same hammer.

Generally, a hammer excavating the ground obtains the excavating force by using a fluid such as air or water, and also controls the operation of the hammer.

Regarding the conventional hammer structure, Registration Practical Utility Model Registration No. 20-0429346 discloses that when the compressed air supplied from the air compressor reaches the air hammer through the rotary head and the extension pipe, the piston inside the air hammer moves up and down Striking the beat with repetitive action, the bit is broken into various grounds and excavation takes place.

The components of the air hammer used here can be roughly classified into chucks, sheaths, pistons, compressed air distributors, and tops. In the role of each component, the chuck is coupled to the bottom of the shell, The outer shell surrounds the outer periphery of the piston and smoothly reciprocates the piston. The compressed air distributor distributes the air so that the piston reciprocates, the top sub is coupled to the upper side of the shell, and the compressed air And also to an extension pipe for supplying the water.

In addition, in Registration Practical Utility Model Registration No. 20-0273989, an air hammer is provided with a drill bit on a hollow portion of a cylindrical housing constituting the body portion, and a plurality of balls made of a hard material And a large-diameter tooth assembled so as to enlarge outwardly from the fixed tooth is provided. Therefore, by driving the bit provided in the hollow portion in a state where the housing of the air hammer is vertically mounted at a site for excavation, The fixed teeth and the large diameter teeth provided at the lower end of the head portion are integrally projected to the lower end of the housing and the bit is rotated and the high pressure air pressure is injected at the same time in a state in which the enlarged teeth are enlarged by the male body, To be excavated.

However, in the conventional drill hammer, the upper and lower operating pressure surfaces of the piston are limited due to the internal structure for operation, so that the force due to the high pressure for driving the piston up and down is limited. The efficiency of the hammer is low.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a drilling hammer which can reduce the loss of compressed air in a hammer and can achieve a high impact with a small amount of air required for operation of the hammer.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to improve the efficiency of the upward / downward movement of the piston by maximizing the working area of the compressed air in the hammer, The present invention is intended to provide a hammering hammock capable of being used.

The hammer of the present invention is composed of an air tube, a piston and a bit, and the piston supplies the compressed air supplied to the air tube to an upper chamber moving pipe for supplying the upper chamber located at the upper portion of the piston and a lower chamber located at the lower portion of the piston And the piston moves up and down repeatedly by alternately supplying compressed air from the air tube to the upper chamber and the lower chamber.

Therefore, the crush hammer of the present invention has a remarkable effect such that the efficiency of the compressed air is increased even when the same compressed air is used, the high striking energy can be obtained by reducing the loss, and the efficiency of the hammer is very high.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
2 is a schematic view showing the flushing step of the bristle hammer of the present invention.
FIGS. 3 and 4 are schematic views showing a first step of piston rising of a crush hammer of the present invention.
5 is a schematic view showing a second step of piston rising of a crush hammer of the present invention.
6 is a schematic view showing a third step of piston rising of a crush hammer of the present invention.
7 is a first schematic diagram of a piston descent and a final step in the piston ascending of the hammer of the present invention.
8 is a schematic view showing a second step of piston descent of a crush hammer of the present invention.
9 is a schematic view showing a third step of piston descent of the crush hammer of the present invention.
10 and 11 are schematic views showing the first stage of piston descent and the piston ascension of the crush hammer of the present invention.

A piston hammer is composed of an air tube (7), a piston (8) and a bit (12), and the piston (8) moves the compressed air supplied to the air tube (7) The upper chamber moving path 8b for supplying the upper chamber 16 and the lower chamber moving path 8a for supplying the lower chamber 17 to the lower chamber 17 located below the piston 8 are formed separately, The piston 8 is repeatedly raised and lowered by supplying compressed air to the upper chamber 16 and the lower chamber 17 alternately.

The piston 8 has the same upper and lower surfaces.

The piston 8 is formed with a concave groove 8c larger than the outer diameter of the air tube 7 inserted into the hollow portion of the piston 8 at the upper center of the piston 8.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the hammer of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

As shown in FIG. 1, the drilling hammer of the present invention has a structure in which the back head 2 and a part of the lower surface of the bit 12 are welded to the wear sleeve 1 at the upper and lower ends of a hollow sleeve- The buffer ring 3, the check valve 4, the check valve spring 15, and the check valve spring 15 from the upper back head 2 in the inside of the wale sleeve 1, The check valve box 5, the air distributor 6, the air tube 7, the piston 8, the second O-ring 14, the guide bush 9, the bit ring 10 and the chuck 11 are sequentially Respectively.

At this time, the inner diameters of the both ends of the wear sleeve 1 are connected to the back head 2 and the thread formed on the outer peripheral surface of the chuck 11, And serves to support the components constituting the inside of the apparatus.

In addition, the bit ring 10 serves as a latching jaw to prevent the bit 12 from being released to the outside of the wear sleeve 1.

On the other hand, when air is inputted from the upper back head 2, the check valve 4 presses the lower check valve spring 15 by the air pressure and is opened. When the air inputted from the back head 2 disappears The check valve 4 is returned to its original state by the restoring force of the check valve spring 15. [

That is, a portion having a small diameter is formed in a part of the outer peripheral surface of the bit 12, and the bit 12 is supported by the lower chuck 11 at this portion, So that it can move up and down in the interior of the container and can not be released to the outside.

FIG. 2 is a schematic view showing the flushing step of the crush hammer of the present invention.

Flushing refers to cleaning and cleaning dust and small stones by forcing air to the area to be drilled before the hammer works.

Thus, as shown in FIG. 2, when the drill hammer of the present invention is placed in a work area, the bit 12 faces downward by its own weight and comes into contact with the lower work surface.

On the other hand, the bit 12 is a hollow body with a lower surface closed, and a protruding portion for crushing the rock is formed on the closed lower surface, and a discharge port 12a is formed so that the air inside can be discharged to the outside .

Particularly, the air tube 7 is in the form of a hollow body, and a plurality of through holes 7a for radiating air from the hollow to the outside are radially formed at the lower end of the tube 7 from the center of the air tube 7 .

The upper end of the piston 8 is formed as a hollow body with a concave groove 12c which is wider than the outer diameter of the air tube 7 inserted into the upper portion of the piston 8, And an upper chamber moving path 8b communicated with the upper chamber moving path 8b for supplying air to the upper chamber 16 formed in the upper space of the piston 8 and supplying air to the lower chamber 16 formed in the lower space of the piston 8 A lower chamber moving path 8a communicating with the lower chamber moving path 8a is formed.

Accordingly, when the air is forcibly blown into the hollow back-head 2, the air is discharged to the outside through the discharge port 12a of the bit 12 without any resistance as the pipe between all the components is opened and closed like an arrow The part to be drilled is pneumatically cleaned.

That is, the air supplied into the air tube 7 is guided to the upper chamber 16 through the concave groove 8c as the through-hole 7a of the air tube 7 is positioned in the concave groove 8c of the piston 8, And the air is supplied to the lower bit 12 through the upper chamber moving path 8b of the piston 8 communicated with the upper chamber 16 so that the discharge port 12a formed on the lower surface of the bit 12, The air is exhausted to the outside through the vent hole.

Part B of FIG. 2 shows the length of the flow when the bit 12 is dropped.

FIG. 3 is a schematic view showing a first step of lifting a piston of a crush hammer according to the present invention, FIG. 5 is a schematic view showing a second step of lifting a piston of a crush hammer according to the present invention, Fig. 7 is a first schematic diagram of the piston descent of the piston hammer of the present invention and the last stage of the piston descent of the piston hammer of the present invention.

Particularly, FIG. 3 is a cross-sectional schematic view of the piston 8 cut vertically, and FIG. 4 is a cross-sectional outline view of all the components including the piston 8 cut vertically. In order to explain the positional relationship between the upper chamber moving pipe and the lower chamber moving pipe, the vertical planes are different from those of Figs. 3 and 4.

As shown in FIGS. 3 and 4, when the drilling hammer of the present invention is pushed into the wear sleeve 1 of the bit 12 in order to operate the hammer, the channel passing through between the internal components in the flushing step is changed And the piston 8 is instantaneously raised as the air is collected in the lower chamber 18 formed in the lower space of the piston 8 in the wear sleeve 1.

That is, the through-holes 7a of the air tube 7 and the lower chamber moving path 8a of the piston 8 coincide with each other so that the compressed air supplied into the air tube 7 flows through the lower chamber moving path 8a And is sent to the lower chamber 17 located at the lower portion of the piston 8. The compressed air is stored in the lower chamber 17 and the piston 8 is raised.

As shown in FIG. 5, when the piston 8 continues to rise and the lower chamber moving pipe 8a of the piston 8 is positioned above the position of the through hole 7a of the air tube 7, The compressed air supplied to the chamber 17 is shut off, but the compressed air already supplied to the lower chamber 17 is inflated by itself and the piston 8 is further raised.

6, when the piston 8 continues to rise and the upper chamber moving path 8b formed on the lower side of the piston 8 coincides with the through hole 7a of the air tube 7 The compressed air in the air tube 7 is sent to the upper chamber 16 located at the upper portion of the piston 8 through the upper chamber moving pipe 8b.

That is, since the inlet of the upper chamber moving path 8b of the piston 8 is formed to be larger than the diameter of the through hole 7a of the air tube 7, the upper chamber moving path 8b is connected to the upper chamber 16 ) Will serve as a buffer.

At this time, when the piston 8 moves up and moves away from the bit 12, the compressed air stored in the lower chamber 17 is discharged to the outside through the hollow portion of the bit 12 and the discharge port 12a.

7, when the piston 8 reaches the top dead center, all of the compressed air stored in the lower chamber 17 is exhausted, and the upper chamber moving path 8b is filled with the compressed air And the piston 8 starts to descend again.

FIG. 8 is a schematic view showing a second step of descending a piston of a hammer according to the present invention, FIG. 9 is a schematic view showing a third step of descending a piston of a hammer of the present invention, FIG. 10 is a cross- FIG. 11 is a schematic view showing the first stage of piston descent and the piston ascension of the piston hammer of the present invention.

8, when the compressed air is stored in the upper chamber 16, the volume of the upper chamber 16 becomes larger, so that the piston 8 descends and the inner channel 8b of the piston 8 is moved to the air The upper chamber moving path 8b communicating with the upper chamber 16 is shut off while being positioned below the position of the through hole 7a of the tube 7 so that the compressed air is no longer stored in the upper chamber 16 do.

9, when the compressed air is no longer sent to the upper chamber 16, the compressed air stored in the upper chamber 16 is adversely transferred to the upper chamber 16 through the upper chamber moving pipe 8b, And the compressed air that has moved to the hollow portion of the piston 8 starts to be discharged to the outside through the discharge port 12a of the bit 12.

As shown in FIGS. 10 and 11, when the compressed air in the upper chamber 16 is discharged to the outside, the lower chamber moving path 8a of the piston 8 is positioned so that the through-hole 7a of the air tube 7 is the same The compressed air is sent again to the lower chamber 17 through the lower chamber moving pipe 8a to serve as a buffer. When the bit 12 is blown, And the rising and falling of the piston 8 are repeatedly performed.

11 is a sectional schematic view of the remaining components except for the piston in Fig.

The crush hammer of the present invention having such a configuration is a high-performance high-efficiency hammer capable of reducing the loss of compressed air generated in the existing hammer and achieving a high impact with a low CFM.

The maximum leakage amount was checked by confirming the loss period and position of the compressed air in the existing hammer through the structural analysis of the most important parts for operating the crush hammer.

In order to prevent compressed air leaking from existing hammer cylinders, pistons and wear sleeves, spacers, chucks and bit grooves, the cylinder is excluded. Compressed air is injected into the gap of the air tube through the redesign of the piston, Reduced loss of air.

The piston shape of the existing hammer and the inside of the wear sleeve were redesigned to increase the hitting force of the hammer and the impact per second.

In the case of the conventional piston, it was confirmed that the pressure area, expansion and buffer area generated in the rising and falling due to the difference in the diameters of the upper and lower areas were low. Especially, the piston was not kept airtight, In order to compensate for this, the top and bottom areas of the piston have the same shape, and the inside of the wear sleeve has been formed into a straight shape without the existing groove.

Theoretically, the performance of the collapsible hammer of the present invention was improved, and it was confirmed that the pressure area due to the increase in the area of the upper and lower portions of the piston was twice as large as that of the conventional hammer.

This is not simply a rise in pressure area, but also a rise in the number of hits and strikes of the hammer.

As a result of measurement of the amount of air (CFM) and pressure loss required to operate the hammer due to the structural change, the amount of CFM was reduced by about 40% compared to the existing hammer, and the loss of compressed air generated during operation of the hammer And a 25 percent loss compared to CFM.

As a result of confirming the striking value of the hammer, the drilling hammer of the present invention increased the striking force up to the upper dead point and increased the striking force about 2.5 times higher than the existing hammer, And the number of times increased by about 30%.

The working area of the compressed air in the upper chamber can be formed to be larger than that of the conventional hammer (because there is no cylinder), and the working area of the compressed air in the lower chamber is smaller than that of the conventional hammer (because there is no piston bush) The area can be made wide. These characteristics improve the upward and downward motion of the piston, thereby increasing the hitting force.

In addition, this effect is enhanced by effectively forming the expansion and compression ratio of the compressed air in the operating section.

Therefore, the crush hammer of the present invention has a remarkable effect such that the efficiency of the compressed air is increased even when the same compressed air is used, the high striking energy can be obtained by reducing the loss, and the efficiency of the hammer is very high.

1. Wear Sleeve 2. Back Head
3. Buffering 4. Check valve
5. Check valve box 6. Air distributor
7. Air tube 7a. Through-hole
8. Piston 8a. Lower chamber moving tube
8b. Upper chamber moving pipe 8c. Concave groove
9. Guide bushing 10. Bit ring
11. Chuck 12. Bit
12a. Outlet 13. First O-ring
14. Second O-ring 15. Check valve spring
16. Upper chamber 17. Lower chamber

Claims (3)

In a drilling hammer striking an underground rock,
The piston 8 is formed of an air tube 7, a piston 8 and a bit 12, the compressed air supplied to the air tube 7 is supplied to the upper portion of the piston 8 A lower chamber moving path 8a for supplying the upper chamber moving path 8b to the chamber 16 and the lower chamber 17 disposed below the piston 8 are formed separately from the air tube 7 By alternately supplying the compressed air to the upper chamber 16 and the lower chamber 17, the piston 8 is repeatedly lifted and lowered,
The piston 8 has the same upper and lower areas,
Characterized in that a concave groove (8c) is formed in an upper center of the piston (8), the concave groove (8c) being larger than the outer diameter of the air tube (7) inserted into the hollow portion of the piston (8).
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