JPH0660557B2 - Excavator sprinkler - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sprinkler for a twin-drum excavator that cuts rocks with high efficiency by using both cutting with a pick and cutting with pressure water. In particular, it relates to an improvement of a sprinkler system for an excavator that can prevent drain water from entering the inside of a planetary speed reducer.

[Conventional technology]

In a conventional twin-drum excavator equipped with rotating drums on both sides of the cutting boom, a water channel for supplying pressurized water to the injection nozzle is provided in a carrier fixed in the frame at the tip of the boom, and the drum body that rotates further It was necessary to provide a watertight rotary seal shaft for supplying pressurized water to a large number of injection nozzles.

As a proposal of this kind, there is an excavating head described in Japanese Patent Publication No. 60-27359. This is because the water supply pipe integrally provided on the shaft of the carrier is opened to the supply chamber and is continuously sealed in the supply chamber of the excavating head body that is rotatably supported, and extends in the axial direction of the excavating head. An annular gap is provided in the drilling head body and is connected to the feed chamber through the passage. This passage is opened to an annular space leading to the cooling water nozzle.

Further, as shown in FIG. 4, in the conventional excavator, a tubular carrier 3 containing a planetary speed reducer 2 is fixed to both sides of a frame 1 at the tip of a boom, and a water channel 4 for pressurized water is provided in the carrier 3.
This water channel 4 is connected to a rotary seal shaft 5 fixed to the tip 3a of the carrier 3, and a water channel 8 formed in a drum cover 7 attached to the side surface of the drum body 6 and An injection nozzle 11 for injecting pressure water to the cutting edge of the excavation pick 10 through the water passage 9 of the drum body.
Are linked to.

Then, in this excavator, when the drive gear 12 in the frame 1 is rotated by the drive motor, the planetary gear 15 meshing with the sun gear 14 of the planetary speed reducer 2 is rotated via the shaft 13 of the gear 12, The inner tooth casing 16 meshing with the planetary gear 15 is decelerated and driven.

Therefore, the friction clutch 1 is attached to the inner tooth casing 16.
The drum body 6 fitted and fixed by 7 is rotated integrally with the inner tooth casing 16. Therefore, the rotary seal shaft 5 fixed to the center of the carrier tip 3a and the drum cover 7 are slid through the rotary seal (packing) 18, and are supplied to the injection nozzle 11 during excavation. When the pressure water is supplied from the pressure water inlet 19 of the frame 1, the water leaks from the rotating portion, and the drain water from the rotary seal 18 has a gap 21 in the drum 6.
And is finally discharged from the drain discharge port 20 formed in the drum cover 7.

[Problems to be Solved by the Invention]

However, in the twin-drum type excavator equipped with rotary drums for excavation on both sides of the tip of the cutting boom, the water channel for supplying the pressure water to the injection nozzle always has a connecting portion with the rotating portion, and water leakage from that portion Is inevitable.

Therefore, in the drilling head 6 described in the above publication, one end of the central pipe 29 fixed to the carrier 11 has a central space 28.
To the feed chamber 3 located at the other end inside the insert 24.
It is open to 0 and is hermetically guided in the insert 24 by a closure 31. However, since the insert 24 rotates around the fixed water supply pipe 29 together with the excavation head 6, water leaks from that portion and is discharged from the passage 41 that is accumulated in the void 37 and opened to the outside of the drum, but the outer periphery of the excavation head. There was a problem that the drain water discharge port opened on the surface was blocked with earth and sand, and eventually the lubricating oil circuit could flood the planetary gears, causing an accident.

Furthermore, in the drilling head described in this publication, both sides of the planetary gear device are fixed by bearings, and the diameter of the bearing is large,
There is a drawback that the inner tooth casing becomes large and the outer shape of the drum becomes large.

Further, in the conventional twin-drum excavator shown in FIG. 4, drain water leaked from the rotary seal 18 between the rotary seal shaft 5 and the drum cover 7 is discharged from the gap 21 to the drain discharge port 20, Since the discharge port 20 is open to the outer surface of the drum cover, there is a drawback that it is easily blocked by excavated earth and sand and water is accumulated inside. Further, since the drum body 6 and the inner tooth casing 16 are fixed by the friction clutch 17, it takes time to disassemble and assemble, and further, the drum body 6 has to be divided into two parts, which causes a cost increase.

The present invention has been completed in view of the above circumstances, and prevents leakage of water from a rotating portion of a water channel by using a rotary seal casing having a simple structure, and a small amount of drain water passes from a carrier base to a frame. It is an object of the present invention to provide a water sprinkler for an excavator that can completely prevent drain water from infiltrating into the planetary reducer due to drainage.

[Means for Solving the Problems]

In order to achieve the above object, the present invention fixes a carrier with a built-in planetary speed reducer in the cutting drum at the tip of the cutting boom,
A twin-drum excavator equipped with a rotary drum that rotatably supports an inner tooth casing with the carrier, and a rotating drum provided with a large number of picks and a jet nozzle for jetting pressure water on the outer circumference of the inner tooth casing. In the water sprinkler, a water passage for supplying pressure water to the injection nozzle is provided inside the carrier,
The water passage is communicated with a rotary seal casing detachably provided at the tip of the carrier, and a rotary seal shaft, which is communicated with the injection nozzle, is watertightly and rotatably fitted in the rotary seal casing. Is provided in contact with a rotary seal shaft in the rotary seal casing, and a rotary seal or a switchable rotary seal is provided at a connecting portion between the water passage and the rotary seal casing. A rotary seal or a switchable rotary seal is provided on both sides of a drain water channel inlet provided in contact with the rotary seal shaft, while the drain water channel passes through the carrier, and its discharge port is provided in the frame of the cutting boom. To do.

Furthermore, the present invention is characterized in that the rotary drum main body is detachably fixed to the inner tooth casing via a pin.

[Action]

 Next, the operation of the present invention will be described.

The sun gear of the planetary gear reducer in the carrier fixed in the cutting drum at the tip of the cutting boom by the drive device is rotated,
The inner tooth casing is rotated at a reduced speed via the planetary gears, and the excavating face is excavated by the multiple picks of the excavating drum integrated with the inner casing. At that time, the pressure water is jetted from the jet nozzle to a position close to the blade edge of the pick, and the pressure water is fed from the water passage in the carrier into the rotary seal shaft through the rotary seal casing, and further in the excavation drum main body. Is supplied to the injection nozzle through the water channel.

On the other hand, the inlet of the drain water channel is provided in contact with the rotary seal shaft and opens between the pair of rotary seals, and the drain water passes through the drainage channel in the carrier from its base to the inside of the frame and the cutting boom. It is discharged from the drain outlet provided on the frame.

Further, since the excavating drum main body is detachably fixed to the carrier via the pin by the bolt, the drum main body can be removed together with the rotary seal shaft by removing the bolt.

〔Example〕

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

This embodiment is shown in FIGS. 1 to 3. In the drawings, the same or equivalent parts as those of the conventional example shown in FIG.

One of the features of this embodiment is that the pressure water passage 4 provided in the carrier 3 is joined to the rotary seal casing 21 fixed to the carrier tip portion 3a via the O-ring 22, and the rotary seal casing 21 is internally provided. There is a vacant chamber 21a, one of which has an open tubular shape, and the open tubular portion 21
A rotary seal shaft 5a fixed to the drum body 6a via a pair of packings 23 is rotatably fitted and inserted in b.

The water passage hole 5b of the rotary seal shaft 5a is provided so as to communicate with the water passage 24 in the drum body 6a. The water passage 24 communicates with a large number of injection nozzles for injecting pressure water near a large number of pick blade edges. Has been done.

On the other hand, the inlet 25a of the drain water channel 25 provided inside the carrier is opened in contact with the rotary seal shaft 5a at the intermediate portion of the pair of packings 23, and the drain water channel 25 is opened from the opening 25b at the base of the carrier 3 to the cutting boom. The water enters the water channel 25c in the frame 1 and is discharged from the discharge port 25d.

To drive the drum 6a of the twin excavator P of this embodiment, a gear 12 is rotated by a driving device (not shown) in the frame 1, and the sun gear 14 of the planetary reducer 2 in the carrier 3 is rotated by this rotational force. This rotational force is applied to the carrier 3
The inner teeth 16a of the inner tooth casing 16 meshing with the planetary gear 15 rotatably mounted on the inner gear 16a.
And the inner tooth casing 16 is rotated at a reduced speed.

The inner tooth casing 16 has an inner periphery rotatably supported by the carrier tip portion 3a by a bearing 26, while the drum body 6a is integrally fitted to the outer periphery via a pin 27. Therefore, the rotary driving force of the gear 12 decelerates and rotates the drum main body 6a having a large number of picks 10, and the picks 10 excavate.

At this time, the pressure water supplied to the injection nozzle 11 that injects the high-pressure water to the position close to the cutting edge of the pick 10 is supplied from the pressure water source (not shown) to the pressure water inlet 19 of the frame 1 and the water channel 28 of the frame 1. It is sent to the water channel 4 in the carrier 3 and enters the empty chamber 21a of the rotary seal casing 21 fixed to the tip 3a of the carrier 3.

Then, the pressure water in the empty chamber 21a is jetted from the water passage 24 of the drum body 6a through the water passage hole 5b of the rotary seal shaft 5a which is rotatably fitted in the opening tubular portion 21b of the rotary seal casing 21. Water is sent to the nozzle 11.

On the other hand, the opening tubular portion 21b of the rotary seal casing 21
The drain water leaked from the rotating contact surface between the rotary seal shaft 5a and the rotary seal shaft 5a is a pair of packings 23 provided on the contact surface.
The drain water channel 25 in the carrier 3 from the inlet 25a of the drain water channel 25 opened in contact with the rotary seal shaft 5a.
To the opening 25b at the base of the carrier 3 and is discharged to the outside from the discharge port 25d through the water passage 25c in the frame 1 of the cutting boom.

In the present embodiment having such a structure, the drain water does not infiltrate into the planetary speed reducer 2 in the carrier 3 and the drain water discharge port is not open to the outside of the drum main body, so that it may be excavated. It is not blocked.

Further, since the drum body 6a of this embodiment is fitted to the carrier 3 via the pin 27 and fixed by the bolt 29, the drum body 6a can be easily removed from the carrier 3 together with the rotary seal shaft 5a by removing the bolt 29. It is possible to pull out, it is easy to divide and assemble, and the rotary seal casing 21 fixed to the tip portion 3a of the carrier 3 by the bolt 30 can be easily removed to easily replace the packing 23.

The shape and structure of the drum main body, the internal tooth casing, the rotary seal portion, etc. are not limited to those shown in the drawings, and are applicable to the scope not departing from the spirit of the present invention, and A switchable rotary seal and a switch valve for injecting water spray only into a limited range on the outer circumference of the drum may be used, and in this case, a plurality of separate and independent water channels may be used.

〔The invention's effect〕

According to the above invention, since the rotary seal casing and the rotary seal shaft are rotatably and watertightly provided in the carrier of the twin drum type excavator, and the drain water channel inlet is provided in contact with the rotary seal shaft, the excavation is performed. At this time, it is possible to completely prevent a small amount of drain water from the rotating sliding surface from being discharged through the drain water channel and infiltrating the inside of the drum of the planetary speed reducer, and the drain water channel provided in the carrier is cut. Since it is connected to the boom frame and the discharge port is not provided on the outer peripheral surface of the drum, it is not blocked by excavated earth and sand.

Moreover, since the inner tooth casing and the rotary drum main body are removably fixed via pins, the drum main body can be easily removed together with the rotary seal shaft, and the assembly and division are easy, and the rotary seal etc. can be replaced. Is also easy.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of the excavating drum of this embodiment, (b).
Is an enlarged half sectional view of the main part, Fig. 2 is a side view of the entire excavator,
FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a sectional view of a conventional excavating drum. 1 ... Frame, 2 ... Planetary reducer, 3 ... Carrier, 4 ... Pressure channel, 5, 5a ... Rotary seal shaft, 5b ... Water passage hole, 6, 6a ... Drum body, 11 ... Injection nozzle, 14 …… Sun gear, 15 …… Planet gear, 16 …… Internal tooth casing, 21 …… Rotary seal casing, 24 …… Drum body pressure channel, 25 …… Drain channel, 25a …… Drain channel Inlet, 25d …… outlet, 27 …… pin, 28 …… frame pressure channel, 29 …… bolt.

Claims (5)

[Claims] 1. A carrier with a built-in planetary speed reducer is fixed in a cutting drum at the tip of a cutting boom, the inner tooth casing is rotatably supported by the carrier, and a large number of picks and pressure water are provided on the outer periphery of the inner tooth casing. In a sprinkler of a twin-drum type excavator equipped with a rotary drum provided with a jet nozzle for jetting, a water channel for supplying pressure water to the jet nozzle is provided inside the carrier, and the water channel is the carrier. A rotary seal casing, which is detachably provided at the tip, communicates with a rotary seal shaft, which communicates with the injection nozzle, is watertightly and rotatably fitted in the rotary seal casing, while the drain water channel inlet is connected to the rotary seal casing. A water sprinkler for an excavator, which is provided in contact with a rotary seal shaft in a casing. 2. The water sprinkler for an excavator according to claim 1, wherein a rotary seal or a switchable rotary seal is provided inside the rotary seal casing. 3. The excavator according to claim 1, wherein the drain water passage of the rotary seal or the switchable rotary seal passes through the inside of the carrier, and the discharge port is provided in the frame of the cutting boom. Sprinkler. 4. A water sprinkler for an excavator according to any one of claims 1 to 3, wherein a rotary drum main body is detachably fixed to the inner tooth casing via a pin. 5. The water sprinkler for an excavator according to claim 1, wherein the inner tooth casing is rotatable at the tip of the carrier.