JPH0223614Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a rotary excavator used as an excavator for excavating in a circular manner, for example, concrete-paved or asphalt-paved ground, or unpaved ground. .

[Prior art]

Below, the conventional rotary drilling equipment is shown in Figures 4 and 5.
This will be explained with reference to the figures. In the figure, 6 is a stand, and this stand 6 includes a base part 6-1, a ratchet column 6-2 erected on the base part 6-1, and an elevator mounted on the ratchet column 6-2 so that it can be raised and lowered. It consists of a body 6-3 and a handle 6-4 for raising and lowering the elevating body 6-3 attached to the elevating body 6-3,
The handle 6-4 is operated to raise and lower the elevating body 6-3 relative to the ratchet column 6-2. Reference numeral 3 denotes the main body of a rotary excavation device that is integrally attached to the elevating body 6-3 of the stand 6 mentioned above. It is freely supported and has a built-in power transmission mechanism (not shown), and the rotating shaft of the motor 5 and the hollow shaft 2 are linked by the power transmission mechanism.
The above-mentioned hollow shaft 2 is integrally provided with a flange 2-1 at the lower end. 1 is the flange 2- of the hollow shaft 2 mentioned above.
The rotary bit 1 has a shank 1-1 having a cylindrical shape with an open bottom end, and a plurality of chips 1 implanted on the edge of the opening on the lower surface of the shank 1-1. -2.
4 is a water supply pipe fixed to the above-mentioned main body 3, and the upper end of this water supply pipe 4 protrudes slightly from the upper surface of the main body 3, and a water supply hose 7 from a water supply device (not shown) is connected to the upper end. , while the lower end is located in the hollow shaft 2 described above. A water supply port 2-2 is formed at the lower end opening of the above-mentioned hollow shaft 2, that is, at the center of rotation of the rotary bit 1, and is provided toward the inside of the rotary bit 1.

Next, the punching operation will be explained. stand 6
The base part 6-1 is attached to the object 1 to be perforated, such as asphalt, concrete, or pipe, using an anchor bolt or the like.
0, and the rotary bit 1 is positioned at the drilling cylindrical location of the object 10 to be drilled. Next, the operation handle 6-4
to push down the rotary bit 1 onto the object to be drilled. This stand 6 pushes down the bit 1 at an appropriate speed and applies an appropriate pushing down force to the bit 1. Next, the motor 5 is driven to rotate the hollow shaft 2.
While rotating rotary bit 1 through
Cooling water is supplied from -2, and holes are vertically drilled in the object 10 to be drilled. The above-mentioned cooling water cools the heat generated by the friction between the tip 1-2 and the object 10 to be drilled, and also reduces the wear of the tip 1-2 and accelerates the drilling speed.

However, in the above-mentioned conventional rotary excavation equipment, the water supply port 2-2 is simply provided at the rotation center of the rotary bit 1, so even if cooling water is supplied from the water supply port 2-2, the cooling water is not supplied. As shown by the two-dot chain arrow in FIG. 4, the droplets are not transmitted to the inner wall of the rotary bit 1 and fall directly onto the drilling surface of the drilling object 10. Therefore, the cooling effect of the rotary bit 1 is small, and a large amount of water is required to increase the cooling effect. In addition, the perforated object 10
As shown in Figure 5, when the drilling surface is inclined and the hole is drilled perpendicular to the drilling surface, the cooling water flows to the lower part of the drilling surface and flows to the higher part, as shown by the two-dot chain arrow. There is a problem that the cooling effect and drilling efficiency of the tip 1-2 are reduced and the wear of the tip 1-2 is accelerated.

[Problem that the invention attempts to solve]

An object of the present invention is to provide a rotary drilling device that can improve the cooling effect of the tip of the rotary bit, thereby improving drilling efficiency and suppressing wear of the tip.

[Means for solving problems]

The rotary excavation device of the present invention has a rotary bit having a cylindrical shape with an open lower end and a tip provided at the lower end, a main body to which the rotary bit is rotatably attached, and a motor for rotating the rotary bit. In a rotary excavation equipment comprising a water supply port provided at the center of rotation of the rotary bit toward the inside of the rotary bit, and a water supply device connected to the water supply port, a receiver for cooling water splashing is provided opposite to the water supply port. The rotary bit is characterized in that it has an opening between the receiving part and the water supply port for allowing cooling water to scatter onto the inner wall of the rotary bit.

[Effect]

Cooling water supplied from the water supply port into the rotary bit is splashed by the receiving plate toward the inner wall of the rotary bit, thereby cooling the tip of the rotary bit.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary excavation device according to the present invention will be described below with reference to FIGS. 1 to 3. In the figure,
The same reference numerals as in FIGS. 4 and 5 indicate the same parts.

Therefore, the rotary excavation equipment of the present invention in this embodiment has a receiving part 8 for cooling water splashing disposed opposite to the water supply port 2-2, and a connection between the receiving part 8 and the water supply port 2-2. In between, an opening 80 is provided for cooling water to splash onto the inner wall of the rotary bit 1. That is, a disk-shaped receiving portion 8 is provided on the lower surface of the flange 2-1 of the hollow shaft 2, and an opening 80 is provided between the flange 2-1 and the receiving portion 8 so as to face the water supply port 2-2. Attach integrally using small diameter support rods, screws, pins 81, etc. One or more blades 9 are provided radially on the upper surface of the receiving plate 8 described above. In addition, in the figure, three are provided.

Since the rotary excavation equipment of the present invention in this embodiment has the above-described configuration, the rotary bit 1
When cooling water is supplied from the water supply port 2-2 while rotating, the receiving part 8 rotates together with the rotating bit 1,
In addition, since the cooling water is supplied from the water supply port 2-2 toward the receiving part 8, the cooling water flows to the receiving part 8 as shown by the solid arrow.
Due to the centrifugal force and the diffusion action of the blades 9, the particles are scattered from the opening 80 toward the inner wall of the rotary bit 1. Therefore, the tips 1-2 of the rotary bit 1 can be efficiently cooled, thereby improving drilling efficiency and reducing tip wear.

Furthermore, as shown in FIG. 2, even if the drilling surface of the object 10 to be drilled is inclined and the hole is drilled at right angles to the inclined drilling surface, the cooling water flows in the direction of the solid line arrow as described above. As shown, the particles scatter on the inner wall of the rotary bit 1, producing the same effect as described above.

In the above-described embodiment, the rotary excavation device of the present invention is supported on the stand 6, but it may be supported on an arm mounted on a working vehicle.

Further, although the receiving portion 8 is provided on the flange 2-1 of the hollow shaft 2, it may be provided integrally with the rotary bit 1.

Furthermore, although the blades 9 are provided on the receiving portion 8, they may not be provided.

[Effect of idea]

As is clear from the above embodiments, the rotary excavation equipment of the present invention is provided with a receiving part for cooling water splashing facing the water supply port, and a cooling water droplet between the receiving part and the water supply port. Since an opening is provided for water to scatter on the inner wall of the rotary bit, the cooling water supplied from the water supply port is scattered toward the inner wall of the rotary bit by the receiving part, efficiently cooling the tip of the rotary bit. As a result, drilling efficiency can be improved and chip wear can be suppressed.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the drilling machine according to the present invention. Figure 1 is an explanatory diagram of a state in which a hole is drilled vertically, and Figure 2 is an explanatory diagram of a state in which a hole is drilled perpendicularly to an inclined drilling surface. An explanatory diagram of the state of piercing, Fig. 3 is - in Fig. 1.
FIG. Figures 4 and 5 show a conventional drilling machine, with Figure 4 being an explanatory diagram of a state in which a hole is drilled vertically, and Figure 5 being an explanatory diagram in a state in which a hole is being drilled at right angles to an inclined drilling surface. be.

Claims (1)

[Scope of utility model registration request] A rotary bit having a cylindrical shape with an open lower end and a tip provided at the lower end, a main body to which the rotary bit is rotatably attached, a motor for rotating the rotary bit, and a rotary bit located at the center of rotation of the rotary bit. In a rotary excavation equipment equipped with a water supply port provided toward the inside of the water supply port and a water supply device connected to the water supply port, a receiving portion for cooling water splash is disposed opposite to the water supply port, and the receiving portion is provided with a receiving portion for splashing cooling water. 1. A rotary excavation device characterized by having an opening between the part and the water supply port for allowing cooling water to scatter onto the inner wall of the rotary bit.