JPH0442391Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a drilling pick for an excavator that excavates rocks, minerals, etc. while jetting high-pressure water.

[Conventional technology]

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

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 that it can move up and down, the slewing ring is pivotable by a jack, and the boom is also 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 that is being cut is pressed against the rock by the pushing 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,
A rock excavation machine disclosed in Publication No. 22482 is known.

This rock excavator is equipped with a cutter head that is rotated by a motor installed in the support at the front of a support that is propelled underground by a thrust cylinder mechanism. In addition to protruding the cutter and bucket, the tips of the branch pipes are opened toward the bucket on the front of the support, and the watering holes are opened in the front of the cutter head, and the proximal ends of these branch pipes and the watering holes are opened. is connected to a water supply pump through a branch pipe and a water supply pipe provided in the support, and pressure is applied continuously from the opening of the branch pipe and intermittently from the water sprinkling hole as the cutter head rotates. It sprays water in front of the cut head.

In the conventional device described above, as shown in FIG. 4, a pick 4 having a tip 3 at the tip is attached to a pick holder 2 which is fixed by welding or the like to a rotating drum 1 at a predetermined interval. A water passage 6 is formed in this pick holder 2 to flow water to an injection nozzle 5 that injects high-pressure water supplied from a high-pressure pump. It is sprayed towards the tip of the

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional device, in order to accurately hit the tip of the pick 4 with the jet of water, if the spray nozzle 5 is placed close to the pick 4, the energy of the jet water hitting the pick 4 must be There was a problem that the dust was absorbed and the effectiveness of cooling the tip of the pick and preventing dust scattering was reduced.

On the other hand, if the injection nozzle 5 is placed on the outer periphery away from the pick 4, the distance L from the tip of the point pick that the injection water hits becomes large, and the distance S between the injection nozzle 5 and the excavated rock increases. Because of its small size, the nozzle portion 5a easily comes into contact with rocks, resulting in severe wear and durability.

Further, as mentioned above, if the distance L between the point of contact with the sprayed water and the tip of the pick is large, there is a problem in that the cooling of the tip of the pick and the effect of preventing dust scattering are reduced.

The present invention was developed in view of the above circumstances, and by forming a groove on the outer circumferential surface of the pick, the above problems can be solved at once, and the high-pressure water jet can efficiently cool the pick cutting edge and remove dust. The object of the present invention is to provide a digging pick for an excavator that can prevent scattering.

[Means for solving the problem] In order to achieve the above-mentioned purpose, the present invention has a rotating drum attached to the tip of a boom that can swing and move up and down on the excavator body, and a pick is arranged on this rotating drum. In an excavator, a groove through which high-pressure water passes is formed on the outer peripheral surface of a pick provided on a rotating drum, and an injection nozzle is provided behind the pick to inject high-pressure water, and the high-pressure water from the injection nozzle is It is characterized in that it passes through a groove formed in the pick and hits the tip of the pick, and is further characterized in that the groove provided on the outer circumferential surface of the pick is formed of a plurality of grooves.

[Effect]

Next, to explain the operation of the present invention, the rotating drum at the tip of the boom, which is attached to the excavator body so as to be able to rotate and move up and down, is moved to the excavation face surface, and then the pick provided on the rotating drum is pressed against the jack. It then presses against the rock surface. When the rotary drum is driven to rotate to excavate rock, high-pressure water from the high-pressure pump is sprayed from the spray nozzle toward the tip of the pick.

In this case, the high-pressure water jetted from the injection nozzle passes through the groove formed on the outer circumferential surface of the pick and is injected to the tip of the pick, so the injection nozzle can be located behind the pick and placed closer to the pick. Moreover, it can hit rocks close to the pick cutting edge.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. In the figures, parts that are the same or equivalent to those in the conventional example are given the same reference numerals and explanations are omitted.

1 and 2 show an embodiment of the present invention, in which pick holders 2 are fixed to a rotating drum 1 at predetermined intervals by welding or the like. A shank portion 4a of a pick 4 is fitted into a through hole 2a formed in the pick holder 2 and is fixed integrally with a fixing member 9. A tip 3 is provided at the tip of the pick 4 by welding or the like, and a groove 7 is formed on the outer peripheral surface of the pick 4.

On the other hand, the pick holder 2 is provided with a spray nozzle 5 near the rear of the pick 4 that sprays high-pressure water supplied from a high-pressure pump (not shown), and a water passage 6 that supplies high-pressure water to the spray nozzle 5. It is provided to penetrate the pick holder 2.

Therefore, the high-pressure water jet injected from the injection nozzle 5 passes through the groove 7 from the rear of the pick 4 and collides with the rock near the tip 3 at the tip of the pick, making it possible to prevent dust scattering and also to prevent the pick 4 from flying. Removes heat from excavation and cools it down.

Note that point P in FIG. 2 indicates the center of the high-pressure water jet in this case.

When excavating rocks or ores with an excavator equipped with a rotating drum 1 provided with a pick according to this embodiment,
After moving the excavator main body and boom (not shown), a pick 4 provided on the rotary drum 1 is pressed against the excavation face surface, and the rotary drum 1 is driven to rotate.

During this excavation, high-pressure water from a high-pressure pump is injected from the injection nozzle 5, passes through the groove 7 of the pick 4, and is injected onto the rock at the tip of the pick 4.

In this way, in excavation using the pick of this embodiment, even if the injection nozzle 5 is provided near the pick 4 because of the groove 7 formed in the pick 4, the distance L can be made small, and the tip of the pick 4 can be It is possible to apply a high-pressure water jet to nearby rocks, which improves the effect of preventing dust scattering and is also convenient for cooling the pick.

Moreover, since the injection nozzle 5 can be provided near the rear of the pick 4, the distance S can be increased, the nozzle part can be prevented from colliding with rocks, and the durability of the drum can be further improved.

FIG. 3 shows another embodiment of the present invention, in which a plurality of grooves 8, 8 are formed in the groove on the outer peripheral surface of the pick 4, which has the effect of preventing scattering of dust and improving the pick. Cooling performance can be further improved.

It goes without saying that the shape and number of the grooves 7 and 8 are not limited to those shown in the drawings.

[Effect of idea]

As described above, according to the present invention, a groove through which high-pressure water passes is formed in the outer circumferential surface of a pick provided on a rotating drum, and an injection nozzle is provided behind the pick to inject high-pressure water, and the injection nozzle Since the high-pressure water jet from the pick passes through the groove formed in the pick and hits the pick tip, the high-pressure water jet can be sprayed near the pick tip, which has an excellent pick cooling effect and reduces pick wear. This greatly reduces the cost of the picks used. Further, by applying the jet of water to the area where the dust generated near the tip of the pick is generated, the dust is not scattered, and the generation of dust is greatly reduced.

This improves the working environment and allows safe driving without obstructing the driver's view.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially sectional side view of the embodiment, and FIG.
AA sectional view, FIG. 3 is a top view of the pick, and FIG. 4 is a partially sectional side view of a conventional example. 1... Rotating drum, 2... Pick holder, 3...
...Tip, 4...Pick, 5...Injection nozzle,
7, 8...groove.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an excavator in which a rotating drum is attached to the tip of a boom that can freely rotate and move up and down, and a pick is provided on the rotating drum, the outer periphery of the pick provided on the rotating drum. A groove through which high-pressure water passes is formed on the surface, and an injection nozzle is provided behind the pick to inject high-pressure water, and the high-pressure water from the injection nozzle passes through the groove formed in the pick and hits the pick. A digging pick for an excavator, characterized in that it is configured so as to hit the tip. (2) The excavating pick for an excavator according to claim 1, wherein the groove provided on the outer peripheral surface of the pick is formed of a plurality of grooves.