JPH0634467Y2 - Excavator cutting drum - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cutting drum of an excavator for excavating tunnels, tunnels, and the like, and more particularly to a structure in which the cutting drum is detachably attached to a drive rotating shaft of the excavator. .

[Conventional technology]

Conventionally, as an excavator of this type, for example, a tunnel excavator with a boom (rod header, drum cutter) transmits a driving force from a drive motor to a transmission shaft via a speed reducer, and a cutting drum attached to the transmission shaft. The rock was being cut with a cutting pick fixed to the drum by rotating.

The boom is then attached to the body via a slewing ring, and on the one hand the boom is attached to the slewing ring via a trunnion so that it can be moved up and down, the slewing ring being pivotable by means of a jack and the boom also being It is configured to move up and down from the jack.

With such a structure, the drum is driven to rotate while jetting high-pressure water, the drum is penetrated into the rock, and the slewing ring is swung to move the boom left and right and up and down to move the rock left and right and up and down. To cut.

At this time, the pick on the front surface of the drum is pressed against the rock by the airframe reaction force, and the side pick during cutting is pressed against the rock by the pressing jack for the boom, and the rock is cut by the rotation torque given to the tip of the pick.

A tunnel excavating machine disclosed in Japanese Patent Publication No. 59-27836 is known as a proposal of this kind.

In this tunnel excavator, the boom supporting the transmission shaft is attached to the excavator body via the slewing ring, and the boom and slewing ring can be rotated and moved up and down with respect to the excavator body via the jack. Is attached to.

As shown in FIG. 2, the conventional tunnel excavator has a cutting drum 5 in which a plurality of picks 4 are planted at the tip 3 of the drum driving rotary shaft 2 in the boom 1.

The mounting structure is such that the outer peripheral portion of the flange 7 provided on the base of the cylindrical boss 6 is fixed inside the cutting drum body 5 by welding or the like, and the integrated one is bored in the tip portion 3 of the rotary shaft 2. The ridges on the inner surface of the boss 6 were inserted into and fitted into the spline grooves 8 and then fastened from the surface of the cutting drum body 5 with the bolts 9 via the bosses 6.

[Problems to be solved by the device]

However, in the conventional structure for mounting the cutting drum 5 on the rotary shaft 2, since the main body of the cutting drum is large and the weight is heavy, the protrusion on the inner surface of the boss 3 is formed in the spline groove 8 provided at the tip portion 3 of the rotary shaft 2. There was a problem that workability was poor because it was difficult to match them.

Further, there is a drawback that the fixing bolt 9 is cut due to the shearing force applied due to the abrasion of the spline portion.

Further, since the head of the bolt 9 faces the tip of the cutting drum 5, that is, the face A, it is damaged by rocks or the like, and the bolt 9 loosens, which may result in an unexpected accident during tunnel cutting.

The present invention has been devised in view of the above circumstances, and has a simple structure with good assembling workability, a cutting drum that can be firmly fixed to a drive rotating shaft, and is durable for long-term use. It is intended to be provided.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an excavator in which a cutting boom having a cutting drum attached to the tip thereof can be rotated and moved up and down, and a spline or a key is provided at the tip of a rotary shaft that drives the cutting drum. And a boss is attached by a fixing bolt, a single or a plurality of torque transmission pins are planted on the outer peripheral portion of the boss base, and a cutting drum main body equipped with a plurality of picks is crowned on the outer periphery of the boss to form the boss. Singular with the torque transmission pin of the
Alternatively, it is characterized in that it is inserted and fixed in a plurality of fixing holes, and that the cutting drum main body and the boss are fixed by locking pins, and a cylindrical boss is fixed to the tip of the rotary shaft through a tightening plate. It is characterized by being fastened with bolts.

[Action]

Next, the operation of the present invention will be described. When the drum drive rotary shaft in the boom is rotated by the drive source, the spline groove or key groove provided at the tip of the rotary shaft and the spline of the protrusion on the inner surface of the boss are splined. The boss is rotated integrally with the rotary shaft by the portion, and the torque of this boss is transmitted to the cutting drum by the torque transmission pin embedded in the flange.
The face can be excavated by the pick of the cutting drum. During this excavation, the locking pin prevents the cutting drum from slipping out of the boss.

When removing the cutting drum main body from the boss, remove the protective cover and pull out the locking pin to pull the cutting drum main body forward. They can be mounted by fitting together, and finally can be integrated by a locking pin.

Furthermore, even if the clearance of the spline portion increases due to long excavation, the boss is fastened to the tip of the rotating shaft by the fastening plate, so slippage occurs between the fastening plate and the boss, and Since no shear force is applied to the bolt, the bolt will not be damaged.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to FIG.

In this embodiment, the tip portion 3 of the drum driving rotary shaft 2 in the boom 1 is
Is inserted and capped in a boss 11 having a cylindrical shape and provided with a flange 10 at the base. At this time, a protrusion on the inner surface of the boss 11 is inserted and fitted into the spline groove 8 or the key groove formed in the tip portion 3. Further, a boss 11 is attached to the tip of the rotary shaft 2 via a tightening plate 12 and a fixing bolt 13
Fastened by. On the flange 10 of the boss 11, a single or a plurality of torque transmission pins 14 are planted in the circumferential direction.

Further, the boss 11 fixed to the tip of the rotary shaft 2 is inserted into the hollow portion 16 formed at the center of the back portion of the cutting drum 15 in which a large number of picks 4 are planted, and at the same time, the boss 11 is drilled on the back surface of the cutting drum 15. The torque transmission pin 14 planted in the flange 10 of the boss is inserted into one or more fixing holes provided.

Finally, insert the locking pin 17 into the locking hole that is bored in communication with the cutting drum 15 and the boss 11 to integrate them, and protect the head of the locking pin 17 with a snap ring 18 The cover 19 is fixed with bolts 20, and the head of the locking pin 17 is covered with the protective cover 19.

According to this embodiment having the above configuration, the boom 1
When the drum driving rotary shaft 2 therein is rotated by a drive source (not shown), the boss 11 is rotated by the spline groove 8 provided on the tip end portion 3 of the rotary shaft 2 and the protrusion on the inner surface of the boss 11. The rotating force of the boss 11 is transmitted to the cutting drum 15 by the torque transmission pin 14 planted in the flange 10, and the face A is excavated by the pick 4 of the cutting drum 15. During this excavation, the locking pin 17 prevents the cutting drum 15 from coming out of the boss 11.

In this way, tunnels, tunnels, etc. are excavated. However, even if the clearance of the spline portion increases due to long excavation, the boss 11 is fastened to the tip portion 3 of the rotary shaft 2 by the fastening plate 12, so that tightening is performed. A slip occurs between the plate 12 and the boss 11, and the shearing force is not applied to the fixing bolt 13, so that the bolt 13 is not damaged and the fixing bolt 13 is housed in the hollow portion 16 in the cutting drum 13. Therefore, it will not be damaged by rocks during excavation.

Further, in this embodiment, when removing the cutting drum body 15, the protective cover 19 is removed by the bolt 20 and the locking pin 17
The cutting drum body 15 can be pulled out easily by pulling it out, and when it is mounted in the opposite direction, it can be easily mounted by aligning the torque transmission pin 14 with the fixing hole on the back surface of the cutting drum 15, and at the end. It can be assembled together by the stop pin 17.

[Effect of device]

According to the present invention, the driving rotary shaft of the cutting drum and the boss are connected to each other by the spline portion, and the boss and the cutting drum are connected to each other by a single or a plurality of torque transmission pins. The force is reliably transmitted to the cutting drum, and it is possible to strongly excavate tunnels and tunnels with a pick. Since all the connecting portions and the fixing bolts are housed in the hollow portion provided at the back of the cutting drum, they are not damaged by rocks or the like during the excavation.

When removing the cutting drum main body from the boss, remove the protective cover and pull out the locking pin to pull the cutting drum main body forward. They can be mounted by fitting together and finally assembled easily by the locking pin.

Furthermore, even if the clearance of the spline portion increases due to long excavation, the boss is fastened to the tip of the rotating shaft by the fastening plate, so slippage occurs between the fastening plate and the boss, and Has no effect of shearing force so that the bolt is not damaged.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1 ... Boom, 2 ... Rotary axis, 3 ... Tip, 4 ... Pick, 8 ... Spline groove, 10 ... Flange, 11 ... Boss, 12 ... Tightening plate, 13 ... Fixing bolt , 14 …… Torque transmission pin 15 …… Cutting drum, 16 …… Hollow part, 17 …… Locking pin, 18 …… Snap ring, 19 …… Protective cover.

Claims (3)

[Scope of utility model registration request] 1. In an excavator in which a cutting boom having a cutting drum attached to its tip can be rotated and moved up and down, a boss is attached to the tip of a rotary shaft for driving the cutting drum by a spline or a key and a fixing bolt. A single or a plurality of torque transmission pins are planted on the outer peripheral portion of the boss base, and a cutting drum main body equipped with a plurality of picks is crowned on the outer periphery of the boss to cut the torque transmission pins of the boss. A cutting drum for an excavator, characterized by being inserted and fixed in a single or a plurality of fixing holes formed in a main body, and fixing the cutting drum main body and the boss by locking pins. 2. The cutting drum for a cutting machine according to claim 1, wherein the locking pin is covered with a protective cover. 3. The cutting drum for a cutting machine according to claim 1, wherein a cylindrical boss is fastened to the tip of the rotary shaft by a fixing bolt via a fastening plate.