JPH0115747Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is suitable for use in pavement layer removal work, which is performed as a pretreatment in construction work such as drilling vertical holes in concrete pavement or asphalt pavement. This invention relates to a rotary excavation device used for pavement layer removal work performed as processing.

[Prior Art] When a conventional rotary excavator is fixed to a movable arm and a pavement layer is to be cut, the movable arm is first operated, the excavator is positioned on the pavement layer to be cut, and the rotary bit is rotated by a drive motor. Circular excavation of the pavement layer was performed by gradually pushing down the movable arm while rotating the machine.

[Problems to be solved by the invention] As mentioned above, in the case of conventional equipment in which the excavation equipment is fixed to a movable arm, it is necessary to push down the movable arm in order to perform excavation, and the movable arm and the pavement layer are Since it is naturally rigid, the slightest push down of the movable arm immediately generates a large cutting reaction force, which can make the rotary bit unable to rotate or damage the cutter of the rotary bit.

The object of the present invention is to solve the above-mentioned problems of the rotary bit being unable to rotate and the cutter being damaged.

[Means for Solving the Problems] The present invention for solving the above problems is equipped with a motor-driven rotating bit attached to the tip of a movable arm equipped on a work vehicle, and a part of the pavement layer on the ground. In a rotary excavation device that cuts into a circular shape, there is provided a structure between the movable arm and the rotary excavation device main body that does not restrict relative movement of the rotary bit between the two in a predetermined range in the direction of the rotation axis, and in a direction perpendicular to the axis. The main body is formed hollow, a hollow shaft is fixed to the lower surface of the main body, a rotating cylinder is attached to the outer periphery of the hollow shaft via a bearing, and the rotating cylinder is connected to the rotating cylinder. The center opening of the upper surface of the bit is connected, the drive motor of the rotary bit and the power transmission device to the rotary cylinder are attached to the main body, an excavation water inlet is provided in the main body, and the hollow main body and the hollow shaft are connected to each other. The rotary bit is characterized in that the rotary bit also serves as a downward passage for the excavation water to flow to the rotary bit.

[Function] A connecting means is provided between the movable arm and the rotary excavation device, which does not restrict relative movement between the two in a predetermined range in the direction of the rotating shaft of the rotary bit, and restricts relative movement in the direction perpendicular to the axis. Therefore, by operating the movable arm, the rotary excavator was positioned on the pavement layer with the rotation axis of the rotary bit perpendicular, and after the movable arm was lowered within a predetermined range in the direction of the rotation axis of the rotary bit, the drive motor When the rotary bit is rotated, the rotary bit cuts the pavement layer in a circular shape and descends over a predetermined range due to the weight of the rotary excavator, thereby cutting the pavement layer in a circular shape. At this time, since movement of the rotary bit in the direction perpendicular to the rotation axis is restrained by the connecting means, the rotary bit does not oscillate laterally.
A rotary excavating device that is attached to a movable arm so as to be able to move up and down includes a drive motor and a power transmission device, so that their own weight is also applied to the cutting surface during cutting.

When cutting with a rotary bit, the temperature of the cutting part of the rotary bit increases due to friction, causing problems such as accelerated wear, so drilling water is supplied. The water flows down the hollow shaft provided at the bottom of the main body from the water inlet and reaches the cutting part from inside the rotary bit.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 3 shows a working vehicle 2 equipped with the rotary excavation device 1 of the present invention, 3 is a steering wheel installed on the working vehicle 2 and rotated by a steering motor 3a, and 4 is the steering wheel. 3 is a horizontal telescoping arm that is extended and contracted by a telescoping motor 4a, and 5 is a vertical telescoping arm that is attached to the tip of the horizontal telescoping arm 4 and is extended and contracted in two stages by telescoping motors 5a and 5b. The rotating ring 3 or the vertical telescoping arm 5 constitute a movable arm. The rotary excavation device 1 is attached to the lower end of a vertical telescoping arm 5, which is the tip of a movable arm.

The mounting structure for the vertical telescoping arm 5 of the rotary excavation device 1 is as shown in FIGS. 1 and 2. A flange 6 for attaching working equipment is provided at the lower end of the arm 5, and a flange 8 at the upper end of a connecting tool 7 for attaching a rotary excavator is aligned with the flange 6 and connected with bolts 9 and nuts 10. The connector 7 has a rectangular tube shape and has an elongated hole 7a on opposing surfaces. On the other hand, a connection tool 7 is provided at the upper end of the hollow main body 11 of the rotary excavation device 1.
A rectangular tube portion 12 is integrally fitted into the rectangular tube portion 12 so as to be slidable and non-rotatable, and a pin 13 is inserted into the round hole 12a provided in the rectangle tube portion 12 and the elongated hole 7a. Accordingly, the main body 11 is connected to the elongated hole 7 with respect to the arm 5.
It is free to slide within the range a without being restricted. The connector 7 or the pin 13 constitute a connecting means.

A drilling water inlet 14 is provided on the side surface of the main body 11, and a hollow shaft 16 is fixed to the center of the main body 11 for supplying water from the inlet 14 to the cutting section by the rotary bit 15, and a bearing is attached to the hollow shaft 16. Rotating cylinder 1 via 17
8, and the rotary bit 1 is attached to the rotary cylinder 18.
5 are concentrically connected to each other. The direction of the rotation axis of the rotary bit 15 coincides with the sliding direction of the main body 11. The rotary bit 15 has a cylindrical shape with an opening at the bottom, and a cutter 15d is provided at the bottom end.

Further, the main body 11 includes the rotary cylinder 18 as a bearing 1.
Hollow disc-shaped frame 2 to be held through 9
a hydraulic motor 21 for rotationally driving the rotary bit 15 through the frame 20;
Attach. Then, the small diameter gear 22 fitted on the output shaft of the hydraulic motor 21 is meshed with the large diameter gear 23 fitted on the rotary cylinder 18, and the hydraulic motor 2
1 is decelerated by gears 22 and 23, and the rotating cylinder 1
The cutter 15d of the rotary bit 15 cuts the pavement layer 24 into a circular shape.

In this configuration, as shown in FIG. 3, first the rotation motor 3a and the telescopic motor 4a are operated,
Operate the steering wheel 3 and horizontal telescoping arm 4 to position the rotary excavation device 1 directly above the pavement layer to be cut, then operate the telescoping motor 5a to extend the vertical telescoping arm 5 and move the rotary bit 15. Katsuta 15
When the arm 5 is lowered so that it is in contact with the surface to be cut of the pavement layer 24, and the arm 5 is further lowered, the position of the pin 13 that connects the connector 7 and the rectangular tube part 12 is located in the elongated hole 7a of the connector 7. It will be located in the middle. In this state, when the hydraulic motor 21 is operated to rotate the rotary bit, the rotary bit cuts the pavement layer 24 in a circular shape due to the weight of the rotary excavator, and is guided by the connecting tool 7 vertically, so that the pin 13 is inserted into the elongated hole. 7a, and cut out the pavement layer 24. If deeper cutting is required, the arm 5 is lowered again and cutting is performed using the rotary bit.

By making the length of the elongated hole 7a longer than the thickness of the pavement layer 24, the pavement layer can be cut by setting the arm down once.

During the cutting operation, excavation water supplied from the excavation water inlet enters the rotary bit 15 from the inside of the main body 11 through the inside of the hollow shaft 16, and is led to the cutting part by the cutter 15d.

In the present invention, the structure of the connection means provided between the movable arm and the rotary excavation device is not limited to the embodiment, and can be modified in various ways.

[Effects of the invention] As described above, according to the invention, relative movement between the movable arm and the rotary excavation equipment within a predetermined range in the direction of the rotation axis of the rotary bit is not restricted, and Since a connecting means for restraining relative movement in the direction perpendicular to the axis is provided, the paving layer can be cut by the rotary excavator's own weight without applying the downward force of the movable arm to the rotary excavator, which reduces the rotation of the rotary bit. Cutting can be carried out smoothly without becoming disabled or damaging the cutter of the rotating bit.

In addition, the pavement layer can be cut vertically without sideways movement without using auxiliary devices such as guide pipes, and the movable arm can be cut automatically by gravity while the movable arm is stopped. It is easy to operate because it can be done.

In addition, rotary excavation equipment that is attached to a movable arm so that it can move up and down includes a drive motor and a power transmission device, so when cutting, the weight of these devices is also applied to the cutting surface, so the weight of the drive device is effectively used. This may require an additional weight or an unnecessarily heavy member as a component of the excavation rig.

In addition, the main body is hollow, and a hollow shaft is provided below, which is used as a passageway for the excavation water to flow down into the rotating bit. It can be directly attached without requiring a swivel joint, the water supply mechanism can be simplified, and a durable device can be realized.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the rotary excavation device of the present invention, FIG. 2 is a sectional view taken along line E-E in FIG. 1,
FIG. 3 is a side view showing an example of an excavator to which the present invention is applied. 1...Rotary excavation device, 5...Arm, 7...
Connecting tool, 7a... Long hole, 11... Main body, 12...
Square tube part, 12a...Round hole, 13...Pin, 15...
...Rotating bit, 21...Hydraulic motor.

Claims (1)

[Scope of utility model registration request] A rotary excavation device that is attached to the tip of a movable arm equipped on a work vehicle, is equipped with a motor-driven rotation bit, and cuts out a part of a pavement layer on the ground in a circular shape, wherein the movable arm and the rotary excavation device main body are connected to each other. Provided between them is a connecting means that does not restrict the relative movement of the rotating bit between the two in a predetermined range in the direction of the rotation axis, and restricts the relative movement in the direction perpendicular to the axis;
The main body is formed hollow, a hollow shaft is fixed to the lower surface of the main body, a rotary cylinder is attached to the outer periphery of the hollow shaft via a bearing, a center opening on the upper surface of the rotary bit is connected to the rotary cylinder, A drive motor for the rotating bit and a power transmission device for the rotating cylinder are attached to the main body,
A rotary excavating device characterized in that the main body is provided with a drilling water inlet, and the hollow main body and the hollow shaft also serve as a downward passage for the drilling water to the rotary bit.