JPH0442390Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a water sprinkling device for a hard rock excavator used for excavating tunnels and shafts, and in particular to a water sprinkling device for a rotary excavator with a retractable excavating drum section. Regarding.

[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 a drum and using a cutting pick fixed to the 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 that it can move up and down, the slewing ring can be pivoted by a jack, and the boom can also be moved up and down by a jack. It is configured to be movable.

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.

Further, as a proposal for an extension/retraction device for a cutting drum shaft, one disclosed in Japanese Utility Model Publication No. 52-14324 is known.

This cutting drum shaft extension and retraction device is equipped with a drum shaft drive section that is connected to a swivel table that is rotatably supported on the excavator body and is equipped with a drum drive prime mover and a speed reducer, and the front end of the cutting drum shaft It has a relay shaft part that is interlocked with a drum shaft supporting the drum shaft and an output shaft of the speed reducer, and transmits power to the drum shaft so as to be extendable and contractable in the axial direction,
The drum shaft is slidably fitted on the outer periphery of a guide cylinder that guides a movable cylinder that supports the drum shaft while restricting its axial movement, and is fixedly connected to the movable cylinder in the axial direction. It has an outer cylindrical body.

As shown in FIG. 2, in a conventional watering system in which a drilling drum expands and contracts, a water supply hole 4 is bored in a drive shaft 3 of a drilling drum 2 equipped with a plurality of drilling picks 1. Pressure water is injected from the injection nozzle 5 towards the target. On the other hand, an output shaft 7 of a reducer 6 that decelerates the driving force from a drum driving prime mover (not shown) is meshed with a relay shaft portion 8 to transmit rotational force.

The tip tooth portion 8a of the relay shaft portion 8 is spline-coupled to the spline shaft portion 3a of the drum drive shaft 3, and is slidable in the axial direction, and transmits the rotation of the output shaft 7 to the drive shaft 3.

In addition, the tip of the water supply pipe 9 that is provided through the output shaft 7 of the reducer 6 is fitted into a through hole 10 that is bored at the rear of the drive shaft 3. A packing 11 is fixed at the tip.

The excavation drum 2 is expanded and contracted by a hydraulic cylinder (not shown).

[Problem that the invention attempts to solve]

However, the above-mentioned conventional watering device has a water supply pipe 9
A packing 11 fixed to the tip of the excavating drum 2 is fitted into a through hole 10 bored at the rear of the drive shaft 3 of the excavating drum 2, and is adapted to slide on the inner surface of the through hole 10. Therefore, it is necessary to process the inner surface of the through hole 10 to make it smooth and to perform a surface treatment such as plating to provide rust prevention properties, but the through hole 10 is difficult to process because it has a small diameter and is long. Also, there were problems in that precise finishing was very difficult and the cost was high.

Furthermore, if the inner surface of the through hole 10 becomes worn out, which may cause water leakage, the entire drive shaft 3 must be replaced, which is expensive and economically disadvantageous.

The present invention was developed in view of the above circumstances, and provides a water sprinkler device for an excavator that has a simple structure, has no risk of water leakage, and can be easily polished even if the sliding surface of the packing is worn out. It is intended to.

[Means for solving problems]

In order to achieve the above object, the present invention is a rotary drum type excavator in which the excavation drum section is extendable and retractable, in which a drum driving prime mover and a reducer are connected, and the output shaft of the reducer is interlocked with the reducer. The water supply pipe is provided with a relay shaft portion that transmits power in an axially expandable and contractable manner with the drive shaft of the excavation drum, and a tip portion of a water supply pipe provided through the output shaft of the reducer is fitted into the drive shaft of the excavation drum, A feature of the present invention is that the space between the drive shaft and the water supply pipe is made watertight by a packing fixed to the rear part of the drive shaft.

[Effect]

Next, to explain the operation of the present invention, when the excavation drum part rotates and expands during excavation, the packing fixed to the rear of the drive shaft slides on the outer periphery of the tip of the water supply pipe, and the pressure water is released. Water is guided from the tip of the water supply pipe through the central water supply hole of the excavation drum to the inside of the excavation drum, and from the water nozzle attached to the outer circumference of the excavation drum, water is sprayed to the outside of the drum to cool the excavation pick and prevent the generation of dust. .

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In the figures, parts that are the same or equivalent to those of the conventional device are designated by the same reference numerals, and explanations thereof will be omitted.

FIG. 1 is a longitudinal section of this embodiment. A water supply hole 4 is bored in the drive shaft 3 of the excavation drum 2 equipped with a plurality of excavation picks 1, and the pressurized water flows through the water passage inside the excavation drum 2. It is injected from the injection nozzle 5 towards the cutting pick 1 through the injection nozzle 5. On the other hand, an output shaft 7 of a reducer 6 that decelerates the driving force from a drum driving prime mover (not shown) is meshed with a relay shaft portion 8 to transmit rotational force.

The tip tooth portion 8a of the relay shaft portion 8 is spline-coupled to the spline shaft portion 3a of the drum drive shaft 3, and is slidable in the axial direction, and transmits the rotation of the output shaft 7 to the drive shaft 3.

An inner cylinder 12 and an outer cylinder 14 that move together with the excavation drum 2 are provided on the outer periphery of the relay shaft part 8, and a fixed cylinder fixed to the reducer 6 is provided between the inner cylinder 12 and the outer cylinder 14. 13 is interposed therebetween, and serves as a guide when the excavation drum 2 is expanded and contracted by a hydraulic cylinder (not shown).

On the other hand, the tip 9a of the water supply pipe 9, which passes through the output shaft 7 of the reducer 6 and is integrally provided with a flange 9b, is connected to a through hole 10 bored at the rear of the drive shaft 3 of the excavation drum 2. It is inserted. A packing 11 is fitted into a ring-shaped groove cut at the rear end of the through hole 10, and holds the tip 9a of the water supply pipe 9 fitted into the through hole 10 in a watertight manner. There is.

Next, the operation of this embodiment will be described. The rotation of the driving motor is reduced by the reduction gear 6, and the output shaft 7 of the reduction gear 6 is driven. This rotation of the output shaft 7 rotates the relay shaft portion 8, and the tip 8a of the relay shaft portion 8 is rotated.
The rotational driving force is transmitted to the drive shaft 3 by spline connection with the spline shaft portion 3a at the rear of the drive shaft 3 of the excavation drum 2, and the excavation drum 2 is rotated.

On the other hand, the excavation drum 2 expands and contracts with respect to the excavator body by a hydraulic cylinder (not shown), and at this time, the drive shaft 3, the inner cylinder 12, and the outer cylinder 14 also move back and forth together with the excavation drum 2. When the drive shaft 3 moves, the packing 11 slides on the outer peripheral surface of the tip 9a of the water supply pipe 9, so that the pressure water in the water supply pipe 9 does not leak, and the water supply hole 4 of the drive shaft 3 is prevented from leaking.
Water is sprayed from the injection nozzle 5 through the water passage 15.

When excavating with the excavation drum 2 as described above, rotational driving and expansion/contraction are performed at the same time, but since the water supply pipe 9 rotates together with the output shaft 7 of the reducer, the tip 9a of the water supply pipe 9 and the packing 11 are connected to each other. Since the pipes only slide, there is less wear on the water supply pipes and the occurrence of water leakage is greatly reduced.

[Effect of idea]

According to the present invention, the excavation drum is driven in an extensible and retractable manner and rotatably by the relay shaft part which is interlocked with the output shaft of the speed reducer and transmits transmission in an axial direction with respect to the drive shaft of the excavation drum. In addition, the tip of the water supply pipe provided through the output shaft of the reducer is fitted into the drive shaft of the excavation drum, and the space between the drive shaft and the water supply pipe is the rear part of the drive shaft. Since the structure is watertight with packing fixed to the pick, there is no risk of water leaking from the sliding surface, and water can be sprayed directly onto the excavated area from the drilling nozzle, which reduces heat generation in the pick and reduces wear. It is possible to greatly reduce the amount of dust generated by sprinkling water on the dust.

Furthermore, according to the present invention, since the outer circumferential surface of the water supply pipe is a sliding surface, it is very easy to finish it smoothly, and if the outer surface is damaged, only the water supply pipe needs to be replaced, which reduces the cost. can also be significantly reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of the embodiment, and FIG. 2 is a longitudinal cross-sectional view of a conventional example. 1...Drilling pick, 2...Drilling drum, 3...
Drive shaft, 4...Water hole, 5...Injection nozzle, 7...
... Output shaft, 8 ... Relay shaft section, 9 ... Water supply pipe, 10
...Through hole, 11...Patzking.

Claims (1)

[Scope of utility model registration request] In a rotary drum type excavator with an extensible excavation drum section, a drum driving prime mover and a reducer are connected, and the output shaft of the reducer is interlocked so that the excavator can extend and retract in the axial direction of the excavation drum drive shaft. The tip of the water supply pipe, which is provided with a relay shaft for transmitting power and is provided to pass through the output shaft of the reducer, is fitted into the drive shaft of the excavation drum, and the drive shaft is connected between the drive shaft and the water supply pipe. A water sprinkler for an excavator, characterized in that it is constructed watertight by a packing fixed to the rear of the shaft.