KR20200037981A - Bit for enlarging excavation hole - Google Patents

Abstract

According to the present invention, suggested is a bit for hole expansion, capable of enabling simpler and quicker work. The bit for hole expansion includes: a cylindrical body (10) including a plurality of inlets (12) connecting the inside and the outside; a plurality of wing bits (30, 40) supported inside the body (10) by a support shaft to be rotatable, thereby being unfolded to the outside of the body through the inlets (12); a hydraulic cylinder (20) installed in the body (10) to move a piston (22) in a vertical direction; and a connection link (24) enabling the bottom of the wing bits to be unfolded to the outside of the inlets as the piston (22) is moved down by the operation of the hydraulic cylinder (20). According to the present invention, the wing bits (30, 40) are formed vertically as multiple stages, for example, the wing bit (40) in the lower part is formed to be longer, so a larger excavation hole can be formed.

Description

Bit for enlarging excavation hole

The present invention relates to a bit for expansion, which is used for excavation construction, and more particularly, to a bit for expansion, which is configured to further expand the diameter of a drilling hole made of a constant diameter.

In general, it can be said that the construction of excavators in civil works mainly depends on bits. However, since it can be said that forming an excavation hole using a bit is directly related to the size of the bit, there is no limit to the size of the excavation hole that can be excavated. Therefore, a specific size or more of the excavator uses special equipment. In order to perform a relatively large-diameter excavation with such equipment, there is a disadvantage that it takes a long time despite using expensive equipment.

In order to solve this disadvantage, various bit assemblies having wing bits have been proposed, and as an example, Korean Patent Application No. 10-2014-0129354 can be cited. In general, a bit having a wing bit for expansion, it is common to use a structurally complicated mechanism or a hydraulic cylinder to maintain the state in which the wing bit is extended. And, for example, in the case of using a hydraulic cylinder, if the hydraulic cylinder breaks down, there is no way to fold the wing bit that was being constructed, which is causing many difficulties in reality.

An object of the present invention is to provide an easy-to-expand bit for expanding an excavation hole formed to a desired size.

Another object of the present invention is to provide a drilling bit configured to remove the drilling component from the excavation hole without damaging the hydraulic device even if it does not operate.

The wing bit of the present invention includes a cylindrical body having a plurality of entrances to communicate with the inside and the outside; A plurality of wing bits that are rotatably supported by a support shaft on the inside of the body and can be extended to the outside of the body through the doorway; A hydraulic cylinder installed inside the body and capable of moving the piston in the vertical direction; And according to the lowering of the piston by the driving of the hydraulic cylinder, the lower end of the wing bit is configured as a wing bit spreading means to spread out of the doorway.

According to an embodiment of the wing bit spreading means in the present invention, the coupling ring is fixed to the piston, and the upper end is pin-connected to the connecting ring, and the lower end is pin-linked to the inner side of the wing bit, and the piston is lowered. According to the lower end of the wing bit is configured to protrude through the doorway.

And according to another embodiment of the wing bit spreading means, it is configured to include an expansion ring fixed to the piston, the expansion ring is configured such that the lower end of the wing bit protrudes through the doorway by pressing the inner upper end of the wing bit downward. do. In this embodiment, the contraction ring fixed to the piston at the bottom of the expansion ring is further configured, and the contraction ring is configured to pull the inner lower end of the wing bit into the inside of the doorway.

According to another embodiment of the wing bit in the present invention, the wing bit unfolding means, the outer end has a fork-shaped connecting ring fixed to the piston, and is installed inside the fork as a pin connected to the upper inner side of the wing bit It is configured, and the lower end of the wing bit spreads outwardly through the pin through the lowering of the piston.

In the present invention, it is preferable that multiple wing bits are installed in multiple stages. In addition, the lower wing bit is molded longer than the upper wing bit, and when opened, it is preferable to construct a relatively large expansion work.

According to another embodiment of the present invention, the body is provided with a plurality of injection nozzles, for example, it is configured to inject compressed air outward from an air tank formed inside the body.

According to the present invention as described above, it is expected that the advantage of making a large borehole more than a certain diameter more convenient. For example, in the case of using a hammer and a bit of a large diameter from the beginning, it took not only a lot of time, but also had an economical burden on the super-large equipment, but the expansion bit of the present invention was relatively inexpensive to manufacture and was fast. You can also expect.

And when looking at the structure of the expansion bit of the present invention, although the wing bit is extended or folded using a hydraulic cylinder, it is configured to be able to fold the wing bit even when the hydraulic cylinder malfunctions. Therefore, it can be said that there is an advantage that can be quickly dealt with in the event of an abnormality in the hydraulic system during work.

1 is a cross-sectional illustration of a bit for expansion according to the first embodiment of the present invention.
Figure 2 is an exemplary cross-sectional view of the bit for expansion according to the second embodiment of the present invention.
Figure 3 is an exemplary cross-sectional view of the bit for expansion according to the third embodiment of the present invention.
Figure 4 is an exemplary cross-sectional view for explaining the operation of the expansion bit of the present invention.
Figure 5 is an exemplary cross-sectional view of another embodiment of the present invention.
6 is a plan view of another embodiment of the present invention.

Next, the present invention will be described in more detail based on the embodiment illustrated in the drawings.

The embodiment illustrated in FIG. 1 will be described first. The expansion bit of the present invention includes a cylindrical body 10 and a plurality of wing bits 30 and 40 that are installed on the body 10 and can be expanded from inside to outside by rotation. The upper portion of the cylindrical body 10 is provided with a connecting portion 2 that is connected to an external device (not shown) in order to put the bit for the expansion into the lower part of the excavation hole. Since the connection part 2 is a configuration that has been widely applied so far, description of this part will be omitted.

In the center of the cylindrical body 10, a hydraulic cylinder 20 is supported in the vertical direction, and a lower portion of the hydraulic cylinder 20 is linearly reciprocated in the vertical direction by hydraulic in and out of the hydraulic cylinder 20. A piston 22 that performs movement is installed. And in the present invention, the wing bits 30 and 40 are installed in multiple stages, and in the illustrated embodiment, they are installed in two stages, and are composed of an upper wing bit 30 and a lower wing bit 40. Able to know.

For example, three upper wing bits 30 are preferably installed at the same height, and the lower wing bits 30 are the same. The wing bits 30 and 40 are rotatably supported around the support shafts 32 and 42 on the inner surfaces of the body 10, respectively. Here, it can be seen that the support shafts 32 and 42, which are rotational support points, are set to the upper portions of the wing bits 30 and 40.

Next, by the driving of the hydraulic cylinder 20, when the piston 22 is lowered, the wing bit (30,40) is rotated to the outside at the lower end around the support shaft (32,42), Figure 1 ( As shown in c), the state protrudes outward. And, as can be seen from (b) and (c), it can be seen that the upper wing bit 30 has a smaller length than the lower wing bit 40, so that the unfolded outer diameter is small. In the body 10 of the portion where the wing bits 30 and 40 are installed, doorways 12 for entering and exiting the wing bits are respectively formed.

In addition, it can be said that various configurations as shown in FIGS. 1 to 3 are possible in the mechanical configuration in which the wing bits 30 and 40 are expanded outward as the piston 22 descends. First, in the embodiment shown in Figure 1, the piston 22 is provided with a connection ring 26 in two stages at an appropriate height. And the interlocking link 22 is connected to the inner upper ends of the connecting ring 26 and the wing bits 30 and 40, respectively, and is connected to the pins Pa and Pa so as to be rotatable.

Therefore, in the configuration of the embodiment shown in FIG. 1, by the lowering of the piston 22, the linking link 26 and the link link 24, which is connected to the upper end pin, are supported as shown in (b) and (c). It is rotated close to the horizontal about the shafts 32 and 42, and accordingly, the lower ends of the wing bits 30 and 40 are spread outward.

In the embodiment shown in FIG. 1 as described above, all the wing bits 30 and 40 composed of a plurality of stages and a plurality of stages in accordance with the descending of the piston 22 are substantially unfolded while the lower end is extended outward. 10) is spread outward. And in the unfolded state, it can be seen that the length of the lower wing bit 40 is set larger so that it can occupy the outside more than the upper wing bit 30.

In this embodiment, the wing bits 30 and 40 are configured to unfold along the descending of the piston 22. However, it can be said that the configuration of the wing bits 30 and 40 to be unfolded according to the rise of the piston 22 is substantially the same. The piston 22 shown in FIG. 1, the coupling ring 26, and the link 22 ) And the wing bit (30,40) is designed to reverse the up and down direction, the wing bit (30,40) will be configured to spread out of the body 10 according to the rise of the piston.

And in order to fold the wing bit (30,40) to the inside of the entrance (12), the piston 22 is raised. As the piston 22 rises, the lower end of the interlocking link 24 raises the pins Pa and Pb, so that the wing bits 30 and 40 rotate inward around the support shafts 32 and 42, and the body (10) inside. And this state is shown in Fig. 1 (a).

It can be seen that the embodiment shown in FIG. 1 is configured such that the linkage link 24 is able to open the wing bits 30 and 40 as the piston 22 descends. Next, the embodiment illustrated in FIG. 2 will be described. The configuration diagram of the embodiment of FIG. 2 is only different from the embodiment illustrated in FIG. 1 only in a mechanical configuration in which the wing bits 30 and 40 are expanded outward as the piston 22 descends. Here, the same components will be described with reference to the same reference numerals.

In this embodiment, the piston 20, the expansion ring 52 and the reduction ring 54 is installed at regular intervals in order to let the wing bit (30, 40) of each layer through the entrance (12) have. The expansion ring 52 and the reduction ring 54 are installed in the same manner for the wing bits of different heights, respectively. And between the expansion ring 52 and the reduction ring 54, each wing bit (30,40) is provided so that the inner end (32,42) of the wing bit (30,40) can be located.

Therefore, even in the present embodiment, when the piston 20 descends, the expansion ring 52 descends and pushes the inner upper ends 34 and 44 of the wing bits 30 and 40 downward. Therefore, the wing bits (30, 40) are rotated so that the lower end of the support shafts (32, 42) spread outwardly, and are in a state as shown in (c) via (b).

And when the piston 20 is raised, the reduction ring 54 rotates the inner upper ends 34 and 44 of the wing bits 30 and 40 upward. Accordingly, the wing bits 30 and 40 rotate clockwise around the support shafts 32 and 42 to enter the inside of the doorway 12 and return to the state shown in (a). In this embodiment, when the position of the support shafts 32 and 42 of the wing bits 30 and 40 is set to a position that can enter the body 10 by the weight of the wing bit, the reduction ring 54 It is expected that it is also possible to omit the configuration of.

Next, the embodiment illustrated in FIG. 3 will be described. In this embodiment, the piston 22 is provided with a connecting ring 26, and the outer end of the connecting ring 26 has a fork 26a shape. And the pins (Pc, Pd) and the fork (26a) are coupled to each other on the upper inner side of the wing bits (30, 40) disposed in two stages. Accordingly, when the piston 22 descends, the wing bits 30 and 40 rotate about the support shafts 32 and 42 through the forks 26a and the pins Pc and Pd. This rotation substantially extends the wing bits 30 and 40 outward as shown in (b). And the rise of the piston 22 will cause the wing bit (30,40) to enter the entrance (12) inside.

According to the configuration as described above, the lifting and lowering of the piston 22 causes the wing bits 30 and 40 to expand outside the body 10 or enter the inside of the body 10. However, it can be seen that the wing bits 30 and 40 are rotated around the support shafts 32 and 42, and the doorway 12 is formed so as not to cause interference with the rotation of the wing bits 30 and 40.

Next, with reference to Figure 4 will be described with respect to the drive and operation of the expansion bit of the present invention. As shown in (a), an excavation hole having a predetermined diameter is formed using a general hammer and bit, and an existing tool is removed as shown in (b). Next, as shown in (c), the expanding bit of the present invention is introduced to reach the lowest surface of the drilling hole as shown in (d).

On the lowest surface of the excavation hole, the high pressure oil is supplied to the hydraulic cylinder 20 to move the piston 22 downward. The wing bit (30,40) is spread outward according to the downward movement of the piston 22 has been described through a sufficient embodiment above. Then, the multi-stage wing bit (30, 40) in the unfolded state through the connecting portion 2, the external device (Rod) is to rotate the present invention bit.

When the bit for expansion of the present invention is rotated, the wing bits 30 and 40 in a state protruding outward of the body 10 perform an expansion operation to further expand the drilling hole with respect to the inner surface of the drilling hole. Although a detailed illustration is omitted here, it can be said that it is natural that a plurality of tips should be mounted on a portion of the outer surfaces of the wing bits 30 and 40 that are in contact with the ground to perform excavation, for example, wing bits. A plurality of tips are installed on the upper and outer surfaces of (30, 40) to perform excavation work.

In addition, it is preferable that the expansion work is carried out while moving upward from the bottom of the drilling hole. Therefore, it can be seen that the upper wing bit 30 is desirably designed to have a shorter length than the lower wing bit 40. By designing the wing bits 30 and 40 to have such a length, it will be possible to smoothly construct a hole with a larger diameter.

A cross section of an excavation hole in a state in which a certain section of expansion work is completed is shown in (e). Here, when the expansion operation is completed, the wing bits 30 and 40 are folded and folded into the body 10, and then taken out from the excavation hole. And folding the wing bit (30,40) means that by pulling the piston 22 upward, the wing bit (30,40) enters the inside of the doorway (12).

Here, an important point in the configuration of the present invention is when a failure of the hydraulic cylinder 20 occurs. For example, even if the hydraulic cylinder of the hydraulic cylinder is lost and the piston 22 cannot be raised, the bit for expansion can be lifted through an external device (rod) connected through the connecting portion 2. When the entire expansion bit is lifted, the wing bit in the unfolded state is folded into the inside of the doorway 12 by reaction force with the excavation surface.

In this way, the wing bit (30,40) is folded into the inside of the entrance (12), the reaction force of the excavation surface acting on the rising wing bit (30,40), such as the body (force pressing the wing bit downward) This is because the entrance 12 is formed so that the wing bits 30 and 40 can enter the inside of the body 10. Since the hydraulic cylinder 20 is designed to pass through the doorway 12 while rotating around the support shafts 32 and 42 as the piston 22 moves only in the vertical direction, the reaction force of the excavation surface As the wing bit is folded, it is possible to enter the doorway 12 inside.

Next, another embodiment of the present invention will be described with reference to FIGS. 6 and 7. This embodiment is based on the configuration of the wing bit (30,40) and the hydraulic cylinder (20) as a driving source having a configuration that can be expanded to the outside of the body 10 as described above, but the slime generated by the operation It is an embodiment further comprising an air nozzle that can blow. Therefore, in the description of this embodiment, description of the same configuration as described above will be omitted.

6 and 7, an air tank 56 is formed on one side of the body 10, and in the illustrated embodiment, a support plate for supporting the hydraulic cylinder 20 at the upper end of the body 10 is shown. It is formed by (58). The air tank 56 made in the airtight state by the support plate 58 is connected to the injection nozzle 52 through the connection pipe 54.

The injection nozzle 52 is installed on the surface of the body 10 at the portion where the above-described wing bits 30 and 40 do not interfere, and blows air outward. The air jet of the jetting nozzle 52 quickly drops the slime generated in the work downward. In addition, it is expected that the air flow generated from the injection nozzle 52 may perform a function of preventing the slime from being caught around the wing bits 30 and 40.

Various modifications can be made to those skilled in the art within the scope of the basic technical idea of the present invention as described above, and of course, the protection scope of the present invention is based on the matters described in the appended claims. It can be said that it should be interpreted.

2 ..... connections
10 ..... Body
12 ..... Entrance
20 ..... Hydraulic cylinder
22 ..... piston
24 ..... Link
26 ..... connecting ring
30 ..... upper wing bit
32, 42 ..... Support shaft
40 ..... lower wing bit
Pa, Pb, Pc, Pd ..... pin

Claims (7)

A cylindrical body (10) having a plurality of entrances (12) communicating inside and outside;
A plurality of wing bits that are rotatably supported by a support shaft inside the body 10 and can be extended to the outside of the body through the doorway 12;
A hydraulic cylinder 20 installed inside the body 10 and capable of moving the piston 22 in the vertical direction; And
According to the lowering of the piston 22 by the driving of the hydraulic cylinder 20, the expansion bit consisting of a wing bit spreading means to expand the lower end of the wing bit to the outside of the doorway.
According to claim 1, The wing bit spreading means,
It consists of a connecting ring fixed to the piston, and an upper end of which is pin-coupled to the connecting ring and a lower end is pinned to the inner side of the wing bit, so that the lower part of the wing bit protrudes through the doorway 12 as the piston descends. Bits for expansion.
According to claim 1, The wing bit spreading means,
It is configured to include an expansion ring fixed to the piston, the expansion ring is a bit for expansion that protrudes through the entrance (12) of the lower portion of the wing bit by pressing the inner upper end of the wing bit downward.
According to claim 3, The wing bit spreading means,
The expansion ring further comprises a contraction ring fixed to the piston at the bottom of the expansion ring, wherein the reduction ring pulls the inner lower end of the wing bit, so that the lower portion of the wing bit enters the doorway.
According to claim 1, The wing bit spreading means,
The outer end consists of a connecting ring fixed to the piston with a fork shape, and a pin installed inside the fork and connected to the upper inner side of the wing bit, so that the lower part of the wing bit through the pin is lowered by the piston downwards. The expansion bit that extends outward.
According to claim 1, A plurality of wing bits are installed in multiple stages, the lower wing bit is molded longer than the upper wing bit, and a spreading bit capable of relatively large expansion work when unfolded.
The bit for expansion according to any one of claims 1 to 6, further comprising a plurality of injection nozzles installed on the body to discharge air to the outside of the body.

Images