WO2013005899A1

WO2013005899A1 - Rod for a bedrock boring apparatus

Info

Publication number: WO2013005899A1
Application number: PCT/KR2011/009397
Authority: WO
Inventors: 정노조
Original assignee: Jung No Jo
Priority date: 2011-07-04
Filing date: 2011-12-06
Publication date: 2013-01-10
Also published as: KR20130004872A; KR101352581B1

Abstract

The present invention relates to a rod for a bedrock boring apparatus which provides a structure for injecting compressed air into a work site, wherein the ratio of the inner diameter to the outer diameter of the rod for the bedrock boring apparatus is optimized, so as to maximize the strength of the rod in the structure. For this purpose, the present invention relates to the rod for the bedrock boring apparatus, consisting essentially of: a boring bit having high strength projections formed thereon for boring the bedrock; and the rod having one end connected to the boring bit and the other end connected to external equipment, wherein a spray hole is formed in the boring bit in order to suction impurities that are released during bedrock boring, a supplying hole is formed in the rod for supplying and spraying compressed air toward the spray hole, the rod is formed in a hollow shape having the outer diameter and the inner diameter, and the ratio of the outer diameter to the inner diameter of the rod is selected within a range of 2.16:1 to 3.25:1.

Description

Rod of rock drill

The present invention relates to a rod of a rock drilling device.

In detail, the present invention provides a configuration in which the ratio of the inner diameter and the inner diameter of the rod of the rock drilling apparatus is optimized to inject compressed air into the work point, and the rod of the rock drilling apparatus which can maximize the strength of the rod in the configuration. It is about.

In general, rock drilling mills are used to drill holes in rocks or relatively hard ground, so that the drilling unit and the drilling unit formed with a cemented protrusion to be drilled in close contact with the drilling target can be driven to a desired depth and length. The rod is connected to an external device such as a crawler drill or an excavator and transmits a driving force to the drilling portion.

On the other hand, the rock drilling plant as described above is provided with a compressed air injection means for blowing the foreign matter to the outside from the drilling operation point in order to prevent the work interference by the foreign matter generated in the drilling process.

A hole is formed in the rod by the compressed air injection means, and after compressed air proceeds through the hole, the compressed air is jetted to the front of the drill bit for drilling the rock, so that the foreign material is drilled at the working point. To avoid interference with the work point.

However, in the case of the conventional rock drilling apparatus as described above, since there is no deep consideration on the structure of the rod, the efficiency for injecting compressed air is reduced, or the inner diameter of the hole formed for injecting the compressed air is excessive and the strength of the rod is increased. As the rod was lowered frequently, the rod was easily broken.

That is, in the ratio of the outer diameter and the inner diameter of the rod, when the value of the inner diameter to the outer diameter is small (when the inner diameter of the hole is small), there is a problem that the strength of the rod is high but the compressed air injection efficiency is lowered. On the contrary, when the value of the inner diameter to the outer diameter is large (when the inner diameter of the hole is large), a problem of high dust collection efficiency but low strength of the rod is exposed.

The present invention is invented to solve the above problems.

Accordingly, an object of the present invention is to provide a rod of a rock punching device which can maximize the strength of the rod and the efficiency of optimizing the ratio of the outer diameter and the inner diameter of the rod to inject compressed air to the working point.

In order to achieve the above object, the present invention has the following configuration.

The present invention, the drill bit for forming a carbide projection for drilling the rock, one side is connected to the drilling bit and the other side rock drilling device comprising a rod connected to the external equipment, the drilling bit at the rock drilling Injection holes are formed to suck the foreign substances generated, and the rod is provided with a supply hole for supplying compressed air to the injection hole side to be injected, the rod is made of a hollow shape having an outer diameter and an inner diameter, The ratio of the outer diameter and the inner diameter of the rod is selected and configured in the range of 2.16: 1 to 3.25: 1.

Here, the length of the outer diameter with respect to the inner diameter of the rod has a larger value as the outer diameter of the drill bit is larger.

At this time, when the outer diameter of the drill bit is in the range of 76mm ~ 95mm, the outer diameter of the rod is 39mm, the inner diameter is applied to 14mm. In addition, when the outer diameter of the drill bit falls within the range of 76mm ~ 95mm, the outer diameter of the rod is 46mm, the inner diameter is applied to 17mm. In particular, when the outer diameter of the drill bit is in the range of 76mm ~ 95mm, the outer diameter of the rod is 52mm, the inner diameter is applied to 20mm.

As described above, the present invention has an effect of optimizing the ratio between the inner diameter and the inner diameter of the rod to maximize the efficiency of the compressed air and the strength of the rod at the same time. Accordingly, there is an economic effect that can maximize the work efficiency and durability of the device.

1 is a schematic view showing a rock mill factory;

2 is a cross-sectional view showing a drilling bit of the rock drilling device according to the present invention;

Figure 3 is a cross-sectional view showing a rod in the rock drilling device according to the present invention,

Figure 4 is a cross-sectional view showing a combined state of the drilling bit and the rod in the rock drilling device according to the present invention.

1: external equipment 10: punching bit

11: B player 13: Carbide protrusion

15: injection hole 20: rod

21: coupling portion 23: supply hole

L1: Outer diameter (rod) L2: Inner diameter (rod)

L3: Outer Diameter (Perforated Bit)

Embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

Figure 1 is a schematic diagram showing a rock drilling mill, Figure 2 is a cross-sectional view showing a drilling bit of a rock drilling device according to the invention, Figure 3 is a cross-sectional view showing a rod in a rock drilling device according to the invention, Figure 4 In the rock drilling device according to the invention is a cross-sectional view showing a combined state of the drilling bit and the rod.

Prior to the description, the gist of the present invention is in the rod for rock drilling device, the description of the known components and coupling relationship of the rock drilling factory will be limited.

Rock drilling mill according to the invention comprises a drill bit 10, the rod 20. The drilling bit 10 includes a cemented carbide projection 13 formed to drill a rock on the surface of one side. Carbide protrusion 13 may be applied to a material such as cemented carbide, artificial diamond having a very high hardness. The rod 20 connects the drilling bit 10 with an external device 1 such as a hydraulic or pneumatic crawler drill or an excavator. To this end, the rod 20 is coupled to one side of the drilling bit 10, the other side is coupled to the external device (1).

Combination of the rod 20 and the punch bit 10 may be made through screwing. In the present embodiment, a female threaded portion 11 is formed inside the punching bit 10, and an overlapping portion 21 having a male screw shape is formed outside the rod 20 to form the drilling bit 10. And it illustrates that the rod 20 is screwed through the threaded portion 11 and the overlapping portion 21. At this time, the rod 20 and the punch bit 10 may be coupled via a separate adapter (not shown).

Here, the rod 20 should be able to extend in accordance with the use environment, in this case, a plurality of rods 20 may be coupled to each other in the longitudinal direction to have a length suitable for use. In the method in which the rods 20 are coupled, a screw coupling such as the rod 20 and the drilling bit 10 may be utilized. (The coupling method of the rods 20 may be easily devised and implemented by those skilled in the art. Not shown)

In the configuration as described above, the rod 20 is a rock fragment (described as foreign matter) generated by a continuous drilling operation between the drilling bit 10 and the working surface in the process of drilling the rock by the drilling bit 10 In order to prevent the phenomenon of interfering with the working point to reduce the drilling efficiency, it is configured to spray compressed air to the drilling bit 10 side to scatter foreign matters at the working point to the rear of the working point.

To this end, the drilling bit 10 is formed with a spraying hole 15 for first sucking the foreign substances generated during the drilling, and the rod 20 for supplying the compressed air to the spraying hole 15 to proceed. The supply hole 23 is formed. At this time, one side of the supply hole 23 of the rod 20 is in communication with the injection hole 15 of the drilling bit 10, the other side is in natural communication with an external suction device (not shown).

In summary, the rod 20 has a supply hole 23 formed therein, so that the rod 20 has an outer diameter L1 and an inner diameter L2, respectively. At this time, the outer diameter (L1) and the inner diameter (L2) of the rod 20 should be preferably set in consideration of the supply efficiency of the compressed air and the strength of the entire rod 20, which is the optimal value through the following experiment Could be derived.

Experiment 1

Table 1 shows the dust collection efficiency according to the ratio between the rod outer diameter and the inner diameter and the outer diameter of the drill bit. As shown in Table 1, compressed air was changed by varying the outer diameter L3 of the drill bit 10 from 76 mm, 85 mm, and 95 mm while changing the inner diameter L2 of the rod 20 having an outer diameter L1 of 39 mm from 10 mm to 20 mm. Was injected and injected efficiency was measured.

The injection efficiency is that the amount of the foreign matter interfered with the front end of the drilling bit 10, that is, the sensor is mounted inside the front end of the drilling bit 10, that is, the foreign matter remaining between the drilling bit 10 and the working surface As the amount of residual foreign matter corresponding to the amount scattered to the rear of the work point decreases, the injection efficiency is detected as high.

As a result of the experiment, as shown in Table 1, the inner diameter (L2) increases with the ratio of the outer diameter (L1) and the inner diameter (L2) of the rod 20 to 3.25: 1 (set the standard injection efficiency to 50%). It can be seen that the higher the compressed air injection efficiency.

Table 1

Psalter		Outer diameter of drill bit
Rod inner diameter (mm)	Ratio (outer diameter: inner diameter)	76 mm	85 mm	95 mm
10	3.9: 1	37%	30%	30%
11	3.54: 1	41%	36%	37%
12	3.25: 1	51%	45%	43%
13	3.0: 1	57%	54%	51%
14	2.78: 1	66%	64%	60%
15	2.6: 1	75%	73%	70%
16	2.43: 1	84%	82%	79%
17	2.29: 1	92%	90%	88%
18	2.16: 1	95%	95%	92%
19	2.05: 1	97%	97%	97%
20	1.95: 1	100%	100%	100%

Experiment 2

Table 2 shows the strain according to the ratio of the rod outer diameter to the inner diameter. Table 2 shows various specimens by changing the inner diameter L2 of the rod 20 having an outer diameter L1 of 39 mm from 10 mm to 20 mm, as in the case of Experiment 1, and each specimen was twisted using a torsional strength meter. Intensities were measured.

As a result of the experiment, as shown in Table 2, the inner diameter (L2) of the rod 20 has a small inner diameter (L2) with a ratio of 2.16: 1 (the reference strain is set to 30%) based on the ratio of 2.16: 1. It can be seen that the lower the strain is.

TABLE 2

Psalter		Strain
Rod inner diameter (mm)	Ratio (outer diameter: inner diameter)	Strain
10	3.9: 1	3%
11	3.54: 1	5%
12	3.25: 1	7%
13	3.0: 1	8%
14	2.78: 1	10%
15	2.6: 1	15%
16	2.43: 1	18%
17	2.29: 1	21%
18	2.16: 1	27%
19	2.05: 1	36%
20	1.95: 1	46%

Based on the above experimental results, the section where the injection efficiency of compressed air is at least 50% (the injection efficiency that does not interfere with the work by the foreign matter at the work point) and the section where the strain less than 30% is generated (the load of Considering the section in which the work is not stopped by the deformation), the ratio of the outer diameter L1 and the inner diameter L2 of the rod 20 is most preferably in the range of 2.16: 1 to 3.25: 1. In addition, in consideration of the stress applied as the outer diameter L3 of the drilling bit 10 increases, the length of the outer diameter L1 with respect to the inner diameter L2 of the rod 20 preferably has a large value.

In addition, considering the optimum ratio of the outer diameter (L1) and the inner diameter (L2) of the rod 20 and the outer diameter (L1) of the rod 20 according to the outer diameter (L3) of the drilling bit (10) the drilling bit ( If the outer diameter (L3) of 10) falls within the range of 76mm to 95mm,

When the outer diameter L1 of the rod 20 is 39 mm, the inner diameter L2 of the rod 20 is preferably 14 mm, and when the outer diameter L1 of the rod 20 is 46 mm, the rod ( The inner diameter L2 of 20 is preferably 17 mm, and when the outer diameter L1 of the rod 20 is 52 mm, the inner diameter L2 of the rod 20 is 20 mm to obtain the most economical and high rigidity. And the highest injection efficiency of compressed air was obtained.

Claims

Rock drilling, which comprises a drill bit (10) having a cemented protrusion (13) for drilling a rock, one side is connected to the drilling bit (10) and the other is connected to an external device (1). In the apparatus,

Injection holes 15 are formed in the drilling bit 10 to suck foreign substances generated during rock drilling, and the rods 20 supply holes for supplying compressed air to the injection holes 15 for injection. 23 is formed,

The rod 20 is made of a hollow shape having an outer diameter (L1) and the inner diameter (L2), the ratio of the outer diameter (L1) and the inner diameter (L2) of the rod 20 is 2.16: 1 to 3.25: 1 Rod of rock drilling device, characterized in that selected within the range.
The method of claim 1,

The length of the outer diameter (L1) to the inner diameter (L2) of the rod (20) is a rod of the rock drilling device, characterized in that the larger the outer diameter (L1) of the drilling bit (10).
The method of claim 1,

When the outer diameter L3 of the drilling bit 10 is in the range of 76 mm to 95 mm,

The outer diameter (L1) of the rod 20 is 39mm, the inner diameter (L2) is a rod of the rock drilling device, characterized in that 14mm.
The method of claim 1,

When the outer diameter L3 of the drilling bit 10 is in the range of 76 mm to 95 mm,

The outer diameter (L1) of the rod 20 is 46mm, the inner diameter (L2) is a rod of the rock drilling device, characterized in that 17mm.
The method of claim 1,

When the outer diameter L3 of the drilling bit 10 is in the range of 76 mm to 95 mm,

The outer diameter (L1) of the rod 20 is 52mm, the inner diameter (L2) is a rod of the rock drilling device, characterized in that 20mm.