KR102154408B1 - Bit for enlarging excavation hole - Google Patents

Abstract

The present invention proposes a bit for expansion that enables a simpler and quicker operation. The expansion bit of the present invention includes: a cylindrical body 10 having a plurality of entrances 12 communicating inside and outside; A plurality of upper wing bits that are rotatably supported by the support shaft 32 on the inside of the body 10 and can be spread out of the body through the entrance 12; It is rotatably supported by a support shaft 42 on the inner side of the body 10 corresponding to the lower part of the upper wing bit, and can be spread out to the outside of the body through the entrance 12, and further outward than the upper wing bit. A plurality of lower wing bits having an extended length; A hydraulic cylinder 20 installed inside the body 10 and capable of moving the piston 22 in the vertical direction; In addition, according to the elevation of the piston 22 by the drive of the hydraulic cylinder 20, the lower end of the wing bit is configured to be extended to the outside of the entrance or to enter into the inside of the entrance wing bit opening and closing means.

Description

Bit for enlarging excavation hole}

The present invention relates to a bit for expansion used in excavation construction, and more particularly, to a bit for expansion configured to further enlarge the diameter of an excavation hole made of a constant diameter.

In general, it can be said that making excavators in civil engineering mainly depends on bits. However, it can be said that forming a drilling hole using a bit has a direct relationship with the size of the bit, so there is inevitably a limit to the size of the drilling hole that can be drilled. Therefore, the excavation hole of a certain size or more uses special equipment, and in order to excavate a relatively large diameter with such equipment, there is a disadvantage that it takes a long time despite the use of expensive equipment.

In order to solve this disadvantage, a variety of bit assemblies having wing bits have been proposed, and as an example, Korean Patent Application No. 10-2014-0129354 may be cited. In general, a bit having a wing bit for expansion is generally using a structurally complex mechanism or a hydraulic cylinder in order to maintain the wing bit unfolded. 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 expanded, so there is a lot of difficulty in reality.

An object of the present invention is to provide a bit for expansion that is easy to expand the hole formed in a predetermined size to a desired size.

Another object of the present invention is to provide a bit for expansion that is configured to remove a part for expansion from an excavation hole without damage even if the hydraulic device does not operate.

The wing bit of the present invention includes a cylindrical body having a plurality of entrances for communicating inside and outside; A plurality of upper wing bits that are rotatably supported by a support shaft from the inside of the body and can be spread out of the body through an entrance; A plurality of lower wings that are rotatably supported by a support shaft on the inner side of the body corresponding to the lower part of the upper wing bit, can be spread out to the outside of the body through the entrance, and have a length extending more outward than the upper wing bit beat; A hydraulic cylinder installed inside the body and capable of moving a piston in an up-down direction; And, in accordance with the elevation of the piston by the drive of the hydraulic cylinder, the lower end of the wing bit is configured to open to the outside of the entrance or to enter into the wing bit opening and closing means. Here, at least a portion of the upper wing bit or the lower wing bit is a bit body that is rotatably supported about a support shaft, and a bit rotating body that is rotatably supported with respect to the bit body and has a plurality of bent tips on the outer surface. It is desirable to be configured.

According to the present invention as described above, the advantage of making a large excavation hole larger than a certain diameter more convenient is expected. For example, in the case of using a hammer and bit with a large diameter from the beginning, it takes a lot of time and has an economical burden on extra-large equipment. However, the expansion bit of the present invention is relatively inexpensive and can be manufactured quickly. You can also expect.

And looking at the structure of the expansion bit of the present invention, the wing bit is unfolded or folded using a hydraulic cylinder, but it is configured to be sufficiently possible to fold the wing bit even when an abnormality occurs in the hydraulic cylinder. Therefore, it can be said that there is an advantage of being able to quickly cope with an abnormality in the hydraulic system during work. In addition, according to the specific shape and function of the wing bit of the present invention, it is expected that the most effective expansion work is possible to expand while moving upward.

1 is an exemplary cross-sectional view showing a folded or unfolded state of the expansion bit according to the present invention.
Figure 2 is an exemplary view of the wing beat of the first embodiment of the present invention.
3 is an exemplary view of a wing bit according to a second embodiment of the present invention.
Figure 4 is an exemplary cross-sectional view for explaining the operation of the bit for expansion of the present invention.

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

As shown in FIG. 1, 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 unfolded from the inside to the outside by rotation. ). In addition, it is the same as in the related art that the expansion bit itself rotates as a whole (drive motor not shown) to perform the expansion operation.

The upper part of the cylindrical body 10 is provided with a connection part 2 connected to an external device (not shown) in order to put a bit for expansion into the lower part of the drilling hole. Since this connection part 2 is actually a configuration that has been widely applied so far, a description of this part will be omitted.

The hydraulic cylinder 20 is supported in the vertical direction at the center of the inner center of the cylindrical body 10, and the hydraulic cylinder 20 is linearly reciprocated in the vertical direction by entering and exiting the hydraulic cylinder 20 at the bottom of the hydraulic cylinder 20. A piston (or push rod) 22 for performing an exercise is installed. And the wing bits 30 and 40 in the present invention 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, it is preferable that about three upper wing bits 30 are installed at the same height, and the lower wing bits 30 are also the same. The wing bits 30 and 40 are supported on the inner side of the body 10 so as to be rotatable around the support shafts 32 and 42, respectively. Here, it can be seen that the support shafts 32 and 42, which are rotational support points, are set to a height above the middle of the wing bits 30 and 40.

Looking at the unfolding operation of the bit for expansion of the present invention, when the piston 22 descends by the drive of the hydraulic cylinder 20, the wing bits 30 and 40 are centered on the support shafts 32 and 42, and the lower end thereof It rotates, and the state protrudes outward as shown in Fig. 1(c). And, as can be seen from (b) and (c), the upper wing bit 30 is smaller in 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, entrances 12 for entering and exiting the wing bits are formed, respectively.

In addition, various embodiments are possible for a mechanical configuration in which the wing bits 30 and 40 are spread outward according to the descending of the piston 22. In the illustrated embodiment, the piston 20 has an expansion ring 52 and a reduction ring 54 installed at regular intervals in order to enter and exit the wing bits 30 and 40 of each layer through the entrance 12 Has been. The expansion ring 52 and the reduction ring 54 are the same for wing bits of different heights. And between the expansion ring 52 and the reduction ring 54, each wing bit (30, 40) is installed so that the inner ends of the wing bits (30, 40) can be located.

Therefore, even in this embodiment, when the piston 20 descends, the expansion ring 52 descends and pushes the inner upper ends 31 and 41 of the wing bits 30 and 40 downward. Accordingly, the wing bits 30 and 40 are rotated so that their lower ends are spread outwardly around the support shafts 32 and 42, and they are in a state as shown in (c) via (b).

And when the piston 20 rises, the reduction ring 54 rotates the inner upper ends 31 and 41 of the wing bits 30 and 40 upward. Therefore, the wing bits 30 and 40 rotate clockwise around the support shafts 32 and 42, come into the inside of the entrance 12, and return to the state shown in (a). In this embodiment, if the position of the support shafts 32 and 42 of the wing bits 30 and 40 is set to a position that can be brought into the body 10 by the weight of the wing bit, the reduction ring 54 It is expected that it is possible to omit the configuration of.

Next, the wing bits 30 and 40 of the present invention will be described with reference to FIGS. 2 and 3. 2 shows one embodiment of the wing bit 30 installed on the upper part. As shown in the enlarged view of FIG. 1, the wing bit 30 that can be installed on the upper side includes a bit body 33 that is rotatable around the support shaft 32, and the outer side of the bit body 33 It consists of a bit rotation unit 34 that is rotatably supported at the end.

The bit rotation unit 34 can be said to be supported so as to be rotatable about the rotation support shaft 38 between the bit body 33 and the bit body 33. And since a plurality of button tips 36 are installed on the outer surface of the bit rotation part 34, it is clear that the reinforcing operation is further maintained. Here, in the expansion bit of the present invention, the body 10 performs the expansion operation while rotating as a whole by the power transmitted from the top is the same in the prior art.

The bit rotation unit 34 in the present invention rotates in response to a reaction with the ground contacting by such rotation of the body 10. Therefore, it is not necessary to install a separate driving source for the rotation of the bit rotation unit 34. The wing bit 30 having such a configuration is used as an upper wing bit in the illustrated embodiment, but it is natural that it cannot be limited to this position.

Figure 3 shows another type of wing bit 40 that can be used in the present invention. It can be seen that the wing bit 40 of this embodiment has a plurality of button tips 46 installed only on its upper and outer surfaces. It will be appreciated that the mounting portion of the button tip 46 is considered to perform the expansion work while the bit of the present invention rises.

Such a wing bit 40 is used as a lower wing bit in the present invention, but it is natural that the present invention cannot be limited by this embodiment. Therefore, the wing bit 30 or the wing bit 40 described above will be able to selectively determine its position, but the wing bit installed in the lower part must have a more outer position than the wing bit installed in the upper part to be advantageous for the expansion work. It is natural.

Next, an overall operation of the expansion bit of the present invention will be described with reference to FIG. 4. As shown in (a), an excavation hole having a predetermined diameter is formed using a general hammer and a bit, and the existing tool is removed as shown in (b). Next, as shown in (c), the bit for expansion of the present invention is put in, and as shown in (d), it is brought to the lowest surface of the excavation hole.

At the lowest surface of the excavation hole, high pressure oil is supplied to the hydraulic cylinder 20 to move the piston 22 downward. It has been described through a sufficient embodiment above that the wing bits 30 and 40 are spread outward according to the downward movement of the piston 22. In this way, in a state in which the multi-stage wing bits 30 and 40 are unfolded, the external device Rod rotates the inventive bit through the connection part 2.

In the present invention, when the expansion bit is rotated, the wing bits 30 and 40 protruding to the outside of the body 10 perform expansion work to further expand the drilling hole with respect to the inner surface of the drilling hole. In the expansion work of such an excavation hole, the bit rotation unit 34 installed on the outer surface of the wing bit 30 located at the top will perform the work while rotating, and the button tip 36 is more effective among these rotation operations. It is thought to enable excavation. In addition, the wing bit 40 is expected to proceed with effective excavation work by the button tip installed only on the upper and outer surfaces.

In addition, since the expansion bit of the present invention moves upward from the bottom of the excavation hole and the expansion work is in progress, the upper wing bit 30 is preferably 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 more smoothly expand the drilling hole with a larger diameter.

The cross section of the excavation hole in the state in which the expansion work of a certain section is completed is shown in (e). Here, when the expansion work is completed, the wing bits 30 and 40 are folded to the inside of the body 10, and then removed from the excavation hole. And folding the wing bits (30, 40) means that by pulling the piston (22) upward, the wing bits (30, 40) to enter the inside of the entrance (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 when the hydraulic pressure of the hydraulic cylinder 20 is lost and the piston 22 cannot be raised, the bit for expansion can be lifted through an external device (rod) connected through the connection part 2. When the entire expansion bit is lifted, the wing bit in the unfolded state is folded into the inside of the entrance 12 by reaction force with the excavation surface.

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

Within the scope of the basic technical idea of the present invention as described above, other various modifications are possible for those skilled in the art, as well as the scope of protection of the present invention based on the matters described in the appended claims. It can be said that it is self-evident that it should be interpreted.

In the illustrated embodiment, it has been described that the wing bits 30 and 40 are spread outwardly or come inwardly by an expansion ring and a contraction ring installed on the piston 22. However, in connection with the vertical motion of the piston 22, the wing bits 30 and 40 rotate around the support shafts 32 and 42 and are configured to expand outward or enter inward. to be. For example, it is considered natural to those skilled in the art that the same operation can be achieved simply by configuring the link between the inner ends of the wing bits 30 and 40 and the piston 22 to interlock. do.

2 ..... connection
10 ..... body
12 ..... Entrance
20 ..... Hydraulic cylinder
22 ..... piston
26 ..... connecting ring
30 ..... upper wing bit
32, 42 ..... support shaft
40 ..... lower wing bit

Claims (1)

A cylindrical body 10 having a plurality of entrances 12 communicating inside and outside;
A plurality of upper wing bits that are rotatably supported by the support shaft 32 on the inside of the body 10 and can be spread out of the body through the entrance 12;
A plurality of lower wing bits that are rotatably supported by a support shaft 42 at the inner side of the body 10 corresponding to the lower portion of the upper wing bit and can be spread out of the body through the entrance 12;
A hydraulic cylinder 20 installed inside the body 10 and capable of moving the piston 22 in the vertical direction; And
Consisting of a wing bit opening and closing means that allows the lower ends of the upper wing bit and the lower wing bit to spread outward or enter the doorway according to the elevation of the piston 22 by the drive of the hydraulic cylinder 20 Become;
The lower wing bit has a length that extends more outward than the upper wing bit, so that the lower wing bit can perform the expansion work with an excavation hole having a relatively larger diameter than the upper wing bit;
At least a portion of the upper wing bit or the lower wing bit is rotatably supported with respect to the support shafts 32 and 42, and the bit body 33 is rotatably supported with respect to the outer surface. It is composed of a bit rotating body 34 provided with a plurality of button tips, and in a state in which the upper wing bit or the lower wing bit is spread outward of the body 10, the bit rotating part 34 is centered on the rotation support shaft 38 It rotates by reaction with the ground in contact by rotation of the body 10;
The wing bit opening and closing means is composed of an expansion ring 52 and a reduction ring 54 installed on the piston 20 with the inner end of the upper wing bit and the lower wing bit interposed therebetween, and descending like the piston 20 The expansion ring 52 pushes the inner ends of the upper wing bit and the lower wing bit downward so that the lower ends of the upper and lower wing bits are spread outwardly around the support shafts 32 and 42, and the piston ( By pushing the inner ends of the upper wing bit and the lower wing bit upward as shown in 20), the lower end of the upper wing bit and the lower wing bit are at the entrance ( 12) comes into the inside;
When it is impossible to raise the piston 22 due to hydraulic loss of the hydraulic cylinder 20, by lifting the expansion bit through an external device connected through the connection part 2, the upper wing bit and the lower part in the unfolded state The wing bit is a bit for expansion, characterized in that it is folded into the inside of the entrance 12 by a reaction force with the excavation surface.

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