JPS63261095A - High-pressure water injection nozzle for assisting excavation pick - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a high-pressure water injection nozzle for assisting a drilling pick of an excavator that excavates hard rock, minerals, etc. while injecting high-pressure water.

[Conventional technology]

Conventionally, this type of excavator, for example, a boom-equipped tunnel excavator (rod header, drum cutter), transmits the driving force from a drive motor to a transmission shaft via a reduction gear, and drives a drum attached to the transmission shaft. Rocks were cut with a rotating cutting pick fixed to a drum.

The boom is attached to the main body via a slewing ring, and the boom is attached to the slewing ring via a trunnion so as to be movable up and down, the slewing ring is pivotable by a jack, and the boom is also pivotable by a jack. It is configured to be able to move up and down.

Based on this configuration, the drum is driven to rotate while injecting high-pressure water, the drum penetrates into the rock, and the slewing ring is rotated to move the boom left and right and up and down, thereby moving the rock left and right and up and down. Cut.

At this time, the pick on the front of the drum is pressed against the rock by the reaction force of the machine, and the side pick during cutting is pressed against the rock by the jack for the boom, and the rock is cut by the rotational torque applied to the tip of the pick.

And, as a proposal of this kind, the Special Publication Publication No. 50-22482
BACKGROUND OF THE INVENTION A rock excavation machine disclosed in the above publication is known.

This rock excavator is equipped with a cutter head rotated by a motor installed in the support at the front of the support that is propelled underground by a thrust cylinder mechanism, and a large number of cutters are installed on the front circumference of the cutter head. In addition to protruding the packet, the tip of the branch pipe section is opened toward the packet on the front surface of the support, and the water sprinkling hole is opened on the front surface of the cutter head, and the proximal end side of the branch pipe section and the water sprinkling hole is opened on the front surface of the cutter head. It is connected to a water supply pump through a branch pipe section and a water supply pipe provided in the support, and pressure is supplied continuously from the opening of the branch pipe section and intermittently from the water sprinkling hole as the cutter head rotates. It sprays water in front of the cutter head.

In addition, the tunnel excavator disclosed in Japanese Patent Publication No. 59-27836 is equipped with an injection nozzle that is located in front of each pick provided on the rotating drum and sprays high-pressure water just before the rotating direction of the cutting edge of the pick tip. The above-mentioned jet nozzles formed in This is a tunnel excavator that applies excavation force using a pick while exciting shock vibrations, allowing efficient crushing and excavation without increasing injection pressure.

Furthermore, the excavation pick proposed by the present applicant in Utility Model Application No. 62-34056 is designed to reduce the distance between the point where high-pressure jet water hits and the tip of the pick, thereby improving the cooling of the tip of the pick and the effect of preventing dust from scattering. A groove through which high-pressure water passes is formed on the outer peripheral surface of the pick provided on a rotating drum, and an injection nozzle is provided behind the pick to spray high-pressure water, and the high-pressure jet water from the injection nozzle is formed on the pick. The pick passes through the groove and hits near the tip of the pick.

[Problem that the invention seeks to solve]

However, in the above-mentioned known excavators, when excavating hard rock, the diameter of the high-pressure water jet for drilling must be small and a large flow rate of water must be supplied. It was necessary to minimize the amount of water and supply a large amount of water.

In particular, a tunnel excavator such as that described in Japanese Patent Publication No. 59-27836 performs crushing excavation by injecting high-pressure water to excite impact vibrations in the excavated rock while applying excavation force with a pick. A larger amount of water has to be supplied, further deteriorating the environment at the face, and since the injection jet is simply a jet nozzle with a smaller nozzle diameter, it rapidly spreads in the radial direction as it moves away from the nozzle and impacts the rock. It also had the disadvantage of not being able to excite vibrations.

Furthermore, if the flow direction of the pressurized water is changed to a right angle and it is ejected from the injection hole through a short nozzle section, turbulence will occur within the nozzle section, the energy of the high-pressure water will be lost, and the energy of the jet water will increase. There was also the problem of attenuation in width.

The present invention has been made in view of the above circumstances, and has a simple structure that sufficiently rectifies high-pressure water from a water supply channel within a short nozzle pipe, and gradually increases the speed of this rectified high-pressure water. The purpose of this invention is to provide a high-pressure injection nozzle that injects a high-speed stream from an injection hole.

[Means for solving problems]

In order to achieve the above object, the present invention includes a boom that can freely rotate and move up and down in the main body of an excavator, a rotating drum is attached to the tip of the boom, a pick is disposed on the rotating drum, and a boom is provided near the tip of the pick. In an injection nozzle that injects high-pressure water to This configuration is characterized by the fact that the fuel is injected.

[Effect]

Next, to explain the present invention in detail, the excavator body has a rotating
After moving the rotary drum at the tip of the boom, which is attached so that it can move up and down, to the excavation face surface, a pick provided on the rotary drum is pressed against the rock surface using a jack or the like.

When excavating rock by rotating the rotating drum, high-pressure water from the high-pressure pump is injected from the injection nozzle toward the tip of the big.

In this case, high-pressure water from the high-pressure pump flows into the nozzle,
After passing through the curved channel, the high-pressure water is immediately introduced into the porous section, and as it passes through the porous section, the high-pressure water is forced into a uniform bundle of small streamlines, and the rectification is almost completed in a short section.

If the above-mentioned porous portion were not present, the individual streamlines would lose their uniformity due to the curvature of the flow path, resulting in turbulent flow, which would require a long straightening section to straighten the flow.

As mentioned above, the high-pressure water rectified in the porous section of the present invention is rectified in the large-diameter low-speed flow section, then gradually increased in speed as it passes through the acceleration section, and finally the necessary flow is carried out in the small-diameter high-speed flow section. Since a high-speed flow is applied, the injection jet does not spread even when ejected over long distances.

If there is no gradual acceleration section in the above injection nozzle passage, turbulence will occur due to rapid contraction, and the energy of high-pressure water will be attenuated, and even if the flow is rectified in the porous section, the effect will be halved. Ru.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Figures 1 and 2 show this embodiment, in which pick holders 1 are fixed to the excavating rotary drum at predetermined intervals by welding or the like, and a pick 2 is fixed to the pick holder 1. It is fixed by a metal fitting 13.

On the other hand, an injection nozzle box 3 that injects high-pressure water supplied from a high-pressure pump (not shown) is fixed to the pick holder 1 with bolts 4.

High-pressure water from the high-pressure pump is fed to the injection nozzle box 3 through the water supply passage 5 of the pick holder 1, and then through the short pipe 6 to the porous pipe section 7 of the injection nozzle box 3.

Inside the injection nozzle box 3, a porous pipe section 7, a large-diameter low-speed flow section 8, a gradual acceleration section 9, and a small-diameter high-speed flow section 10 are linearly arranged in this order from the rear, and are fixed by a nozzle holder 12. There is.

The perforated pipe section 7 is composed of a block with a large number of small holes, and the high-pressure water that has passed through the short pipe 6 and the bent pipe section immediately flows into the perforated pipe section 7. As it passes, it is forcibly formed into a bundle of small uniform streamlines, and the rectification is almost completed in a short section.

This rectified high-pressure water is then transferred to a pipe-shaped large-diameter low-speed flow section 8.
The rectification is completed by the nozzle-shaped gradual acceleration part 9, and finally the high-speed flow rectified by the small-diameter high-speed flow part 1o is injected from the injection port near the tip of the pick 2. Even when sprayed over long distances, it does not spread and turbulence does not occur, so the energy of high-pressure water can be used effectively.

Therefore, according to this embodiment, the jet 11 does not spread out over a long distance because the flow is forcibly rectified in the short nozzle box 3, so there is no need to bring the nozzle so close to the excavation table surface, and the pick is used for rock excavation. In addition, it can suppress the heat generation at the tip of the pick and sufficiently contribute to preventing dust scattering.

〔Effect of the invention〕

According to the present invention described above, the high-pressure water passage is linearly arranged in the order of the porous section, the large-diameter low-velocity flow section, the gradual acceleration section, and the small-diameter high-speed flow section, and the injection is rectified and accelerated within a short section. Since water is sprayed, the jet does not spread out even when spraying over long distances, making it possible to fully utilize the energy of high-pressure water.

Therefore, 1. Even without placing the injection nozzle of the present invention very close to the excavation table surface, it is possible to sufficiently assist the rock excavation of the excavation pick, which prevents heat generation at the tip of the pick during excavation, and also helps prevent dust from scattering. Moreover, it is also advantageous in the production of excavation drums.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway side view, and FIG. 2 is a view taken along the line A--A in FIG. 1. 1...Pick holder, 2...Pick. 3... Nozzle box, 5... Water supply passage, 7...
・Porous pipe section, 8...Large diameter low speed flow section, 9...
Gradual acceleration section, 10... Small diameter high speed flow section, 11...
・Injection jet.

Claims (1)

[Claims] The excavator body is equipped with a boom that can rotate and move up and down, a rotating drum is attached to the tip of the boom, a pick is disposed on the rotating drum, and an injection nozzle that injects high-pressure water near the tip of the pick is provided with the high-pressure water. An excavation pick aid characterized in that the passages are linearly arranged in the order of a porous section, a large-diameter low-speed flow section, a gradual acceleration section, and a small-diameter high-speed flow section, and rectified high-pressure jet water is injected. High pressure water injection nozzle for use.