JPS6332224Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a rod support mechanism for a through-hole drilling machine, and in particular, it includes a plurality of rods arranged to be able to drill through-holes, and a striking device that strikes the rods. This rod is inserted into a rod guide integrally formed by connecting cylindrical bodies in parallel, and in a drilling machine in which the rod guide is equipped with a swivel, an annular groove is provided in the shank of the rod, and an annular groove is provided in the annular groove. The rod can be easily exchanged by providing a retainer that can be moved between a support position in which it is engaged to support the rod and a rod exchange position in which it is disengaged.

In tunnel excavation work, etc., when there are houses or other existing facilities or structures near the construction site, the blasting method is subject to strict regulations on the blasting time, number of blasts, and amount of explosives used in one blast, due to environmental issues such as vibration noise during blasting and safety measures against flying stones, and places that would normally be broken up in one blast must be blasted several times to excavate. Furthermore, in areas where the use of explosives is completely impossible, rock breaking work may be done with a breaker, but this is inefficient for excavating hard rock layers. In such cases, continuous hole excavation allows for more efficient breaking work.

Furthermore, even if there are no restrictions on blasting, if a continuous hole is drilled along the outer periphery of the excavation cross section and blasting is performed using this as a free surface, the tensile fracture of the rock will be utilized, and the amount of explosive will be lower than in core blasting. It has the advantage of requiring less and providing a better finished surface.

As shown in FIGS. 1 and 2, a through-hole drilling machine for use in such cases includes a plurality of rods 2 arranged to be able to drill through holes, and a striking device for striking the rods 2. The rod 2 is inserted into a rod guide 7 integrally formed by connecting cylindrical bodies in parallel, and the rear end of the rod guide 7 has a continuous hole provided with a swivel 9 which also serves as a rod holder. A drilling machine has been proposed.

However, this continuous hole drilling machine has a collar 20 on the shank of the rod 2, and a swivel 9 that also serves as a rod holder to prevent the rod from being pulled out forward (left in the figure, same below). for,
There is a striking device 4. Therefore, when the rod 2 is broken and needs to be replaced, it is not possible to pull out only the necessary rod 2 and replace it. After removing the entire rod guide 7 from the carriage 21, the bit 8 attached to the tip of the rod 2 must also be removed, and the rod 2 must be pulled out from the rod guide 7 rearward. Therefore, replacing the rod 2 was troublesome and time consuming.

This invention solves this problem in through-hole drilling machines.

Therefore, the purpose of this invention is to provide a rod support mechanism for a through-hole drilling machine that allows the rod to be pulled out without removing the entire rod or rod guide. An object of the present invention is to provide a through-hole drilling machine that can easily carry out the process in a short time and improve work efficiency.

That is, this invention has a plurality of rods 2 arranged so as to be able to drill continuous holes, as in the illustrated embodiment.
and a striking device 4 for striking the rod 2. The rod 2 is inserted through a rod guide 7 integrally formed by connecting cylindrical bodies in parallel, and a swivel 9 is attached to the rod guide 7. In the provided continuous hole drilling machine, there is a support position where the shank of the rod 2 is engaged with the annular groove 16 to support the rod 2, and an exchange where the rod 2 is disengaged from the groove 16 and the rod 2 can be extracted. The present invention relates to a rod support mechanism for a continuous hole drilling machine, which is characterized by being provided with a retainer 17 that can be moved and switched between positions.

This invention will be explained below based on the illustrated embodiments.

Figures 3 to 7 show an embodiment of this invention, Figures 3 and 4 are a plan view and side view of the through-hole drilling machine, and Figure 5 is an enlarged view of the rod portion. FIG. 6 is a cross-sectional view taken along the - line in FIG.
FIG. 7 is a sectional view taken along the - line in FIG. 5.

The through-hole drilling machine 1 has a plurality of rods 2, a rotating device 3, and a striking device 4 installed on a carriage 21 and mounted on a guide shell 5, and is moved back and forth by a feeding device 6. be able to.

The rod 2 is inserted through a rod guide 7 which is integrally formed by connecting cylindrical bodies in parallel. In this embodiment, there are five rods 2a, 2b, 2c, 2d,
2e is used, but this number can be selected as appropriate. Each rod 2, 2a, 2b, 2c, 2d,
Bits 8, 8a, 8b, and 8 are placed at the tip of 2e, respectively.
c, 8d, and 8e are attached. Adjacent bits 8 are arranged slightly shifted from front to back, and bits 8
By making the diameter of the rod slightly larger than the center spacing of the rods 2, a continuous hole can be bored. The rod guide 7 extends over almost the entire length of the rod 2.
A swivel 9 is provided at the rear end to supply flushing fluid for discharging the powder. This swivel 9 is fixed to the carriage 21 with bolts 22, and a retainer 17 for preventing the rod 2 from being pulled out is provided behind it. The inner surface of the rod guide 7 and the outer peripheral surface of the rod 2 are closely sealed only at the front end, with a slight gap provided in the middle to form a passage 10 for flushing fluid. Bit 8 and Rod 2
Flushing holes 11 and 12 are bored in the center of the front end of the rod 2, and are communicated with a passage 10 through a communication hole 13 of the rod 2, so that flushing fluid is supplied thereto. 14 and 15 are U packskin.

The rotation device 3 provides rotation to the rod 2.

The striking device 4 is a cylinder for a known rock drill equipped with a reciprocating free piston, and a tappet 23 is provided at the front end of the cylinder.
It has a width that allows it to hit all the rear end surfaces of d and 2e.

Here, the shank portion of the rod 2 is provided with an annular groove 16 instead of a collar as in conventional rods, and a retainer 17 engages with this groove 16.
The retainer 17 has a large diameter portion 18a from which the rod 2 can be pulled out, and a groove 16 in the rod 2 that is engaged with the retainer 17 to allow the rod 2 to be pulled out.
The rod hole 1 has a small diameter portion 18b that can support the
8 are arranged in the same number as the rods 2 and at the same pitch as the rods 2. This retainer 17 is
The small diameter portion 18b of the rod hole 18 is connected to the groove 16 of the rod 2.
The rod hole 18 is disengaged from the groove 16, and the large diameter portion 18a
The rod 2 can be moved to a replacement position where it can be extracted from the hole, and is fixed at the support position with a fixing screw 19 during drilling work.

If any of the rods 2 breaks during drilling, the fixing screws 19 are loosened and the retainer 17 is moved to the replacement position, allowing the rod 2 to be easily pulled out forward and replaced with a new rod 2. Therefore, there is no need to remove the bolts 22 and the entire rod guide 7. After replacing the rod 2, the retainer 17 is moved back to the support position and fixed with the fixing screws 19, and drilling is resumed.

As mentioned above, according to this invention, the rod can be easily extracted and replaced in a short time, and since the entire rod guide is not removed, centering after rod replacement can be omitted, improving work efficiency. can be improved.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side sectional view showing the configuration of the rod portion of a conventional through-hole drilling machine, and FIGS. 3 to 7 show an embodiment of this invention, and FIG. is a plan view of the through-hole drilling machine, FIG. 4 is a side view of the through-hole drilling machine, FIG. 5 is an enlarged plan view of the rod portion, and FIGS. 6 and 7 are FIG. FIG. In the figure, 1 is a hole drilling machine, 2 is a rod, 4 is a striking device, 7 is a rod guide, 8 is a bit, 9 is a swivel, 16 is a groove, 17 is a retainer, 18 is a rod hole, and 19 is a screw.

Claims (1)

[Scope of utility model registration request] a plurality of rods arranged to be able to drill through holes;
A through-hole drilling machine comprising a striking device for striking the rod, the rod being inserted through a rod guide integrally formed by connecting cylindrical bodies in parallel, and the rod guide provided with a swivel,
In addition to providing an annular groove in the shank of the rod,
A continuous hole drilling device characterized by being provided with a retainer that can be moved and switched between a support position where it engages with the groove and supports the rod, and a replacement position where it disengages from the groove and allows the rod to be pulled out. Machine rod support mechanism.