JPH0519430Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a rotary drilling device for excavating vertical holes or excavating road paved surfaces, etc., and is particularly suitable for excavating relatively small diameter and shallow vertical holes. Regarding what is suitable for use. (Prior Art) A cylindrical bucket, which has a bottom cover with an opening for introduction of earth and sand attached to the bottom so that it can be opened and closed, has been conventionally used as a bucket for earth drills. That is, the bucket is attached to the lower end of a multi-stage telescoping Kelly bar that is rotated by a rotary drive device attached to the front frame of the crane, and by rotating it through the Kelly bar, dirt is moved from the opening of the bottom cover into the bucket. A vertical hole corresponding to the diameter of the bucket is excavated, and the soil can be taken into the bucket, so compared to retractable buckets such as clam shell buckets, there is less spillage and the cross-sectional shape is smaller. It is often used to excavate circular vertical holes, especially vertical holes for piling.

However, in this conventional configuration, the kelly lever that supports the bucket belt plays the role of transmitting the rotational force from the rotary drive device to the bucket belt.
Definitely requires a special kelly bar. Further, since a dedicated kely bar is required, it is not possible to perform excavation according to the excavated layer or excavated location by attaching various excavating tools to a single excavator to which the earth drill bucket is attached.

(Problems to be Solved by the Invention) The present invention does not require a dedicated Kerry bar, can be easily attached to the lower end of the lifting arm of an excavator, and is compatible with other excavating tools, and the functionality of the excavator. It is an object of the present invention to provide a rotary excavating device having a structure that can improve the performance of the excavator, and can be downsized without causing run-out due to rotation.

(Means for solving the problem) In order to achieve this objective, the present invention attaches the excavating tool body to the lower end of the lifting arm via a coupling device, and installs the excavating tool drive device inside the excavating tool body. a rotary excavator rotatably driven by the excavator drive device is attached to the lower part of the excavator main body, and the elevating arm, the excavator drive device, and the rotary excavator are arranged concentrically; In the connecting device, a cylindrical body provided at the upper part of the excavating tool main body and separated from the main body is removably fitted into a rod for attaching the excavating equipment provided at the lower end of the lifting arm, and both the rods and the cylindrical body are connected to each other. The structure is such that the main body is connected to the main body by a pin, and an arcuate bracket is attached to the upper part of the main body, and a protrusion is formed in the circumferential direction around the cylindrical body, and the protrusion is connected to the bracket. A stopper mechanism is provided that is rotatably engaged with the cylindrical body but not vertically movable, and that restricts a rotation range between the cylindrical body and the main body, and a handle that rotates the cylindrical body is provided on the outer periphery of the cylindrical body. It is characterized by becoming.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 and Fig. 2 show a rotary excavation device according to the present invention using an earth drill bucket 1, in which 2 is a rotary excavation device having a cylindrical shape having a top plate portion 2a and a lower flange 2b. The main body 2 is attached directly below the lifting arm 3 via a connecting device 4 to a lifting arm 3 installed on a working vehicle or a working stand, etc., which will be described later.

This connecting device 4 has a pair of arcuate L-shaped cross sections on the top plate 2a of the main body 2, as shown in FIGS. Place the bracket 6 on the top plate part 2a.
The lower end rod 3a of the lifting arm 3 is fixed with bolts 7 so as to face each other across the center.
A disk 9 forming a protrusion is fixed to the lower end of the cylindrical body 8 that is fitted into the cylindrical body 8, and the disk 9 is placed between the brackets 6, 6 and the top plate portion 2a. The cylindrical body 8 is attached to the side surface of the lifting arm 3 by fitting it so that it can rotate freely within the rotation range until the pair of protrusions 9a, 9a provided around the brackets come into contact with the end surfaces of the brackets 6, 6. By grasping and rotating the handle 10, the pin hole 8a of the cylindrical body 8 and the pin hole 3b provided in the rod 3a can be aligned in the same direction. , the pin holes 8a and 3b can be aligned in the same direction without rotating the heavy rotary excavation device A.
In other words, the installation of the drilling equipment is facilitated. The abutment between the protrusion 9a of the disc 9 and the bracket 6 constitutes a stopper mechanism in which the lifting arm 3 receives the rotational reaction force of the excavating tool.

Reference numeral 11 denotes a bucket rotation drive device configured such that a hydraulic motor 12 and a speed reducer 13 are concentric. The drive device 11 is accommodated and mounted inside the main body 2 by aligning the flanges 14 provided at the lower part and fixing them with bolts 15 and nuts 16.

The output shaft 40 of the reducer 13 of the drive device 11 includes:
The center of the top plate 1a of the bucket 1 is fixed by the mechanism described below. That is, the output shaft 40
, a cylindrical body 41 with a flange 41a is fitted in a relatively non-rotatable manner, and the cylindrical body 41 is connected to the output shaft 4.
A fixing plate 43 fixed to the lower surface of 0 with bolts 42
The center hole 1b of the top plate part 1a and the receiving ring 45 are fitted into the cylindrical body 41, and the bolts 46 are fixed to the flange 41a and the top plate part 1.
a and the receiving ring 45, and by screwing and tightening the nut 47, the bucket 1 is attached to the output shaft 4.
It is attached concentrically to 0.

The bucket 1 has a bottom lid 1 attached to the lower opening via a hinge 18, similar to the conventional earth drill bucket.
A locking claw 20 is installed on the opposite side of the hinge 18 to engage with the lower end locking portion 19a of the bottom cover locking rod 19.
c has an opening 1 for introducing earth and sand approximately in the radial direction.
d, and a dirt introducing claw 1 is provided at the edge of the opening 1d.
e is provided. In addition, 19b is the locking rod 1
9 is a rod rotation handle provided at the upper end.

Figure 4 shows an example of an excavator that uses this rotary excavator, and shows an example in which the rotary excavator of the present invention is attached to a work vehicle that the inventor has already developed for underground pipe construction. show. This excavator has a support stand 23 installed on the loading platform of a working vehicle 22, and
A swing ring 24 having a swing motor 24a is mounted on the swing ring 24, and a pinion (not shown) rotated by a hydraulic cylinder drive system or a telescopic motor 25b attached to an outer cylinder 25a as shown in the drawing. The rack 25d is attached to the side of the inner cylinder 25c.
A horizontal telescoping arm 25 is attached that employs a rack and pinion drive system that engages with the shaft. A vertical telescoping arm 26 is attached to the tip of the inner cylinder 25c of the horizontal telescoping arm 25, and the vertical telescoping arm 26 is
an outer cylinder 26a fixed to the inner cylinder 25c; a middle cylinder 26b slidably fitted into the outer cylinder 26a;
The inner cylinder 26 is slidably fitted into the inner cylinder 26b.
c (corresponding to the lifting arm 3), and the middle cylinder 26b has a pinion (not shown) rotated by a telescoping motor (not shown) having a rack (not shown) fixed up and down to the outer cylinder 26a. The operation method is a rack and pinion system that moves up and down by meshing with the middle cylinder 26b and the inner cylinder 26c.
The telescopic cylinder 26d has a head connected to the middle cylinder 26b, a piston rod connected to the inner cylinder 26c, and accommodated in these cylinders 26b and 26c.
It is configured to be expanded and contracted by.

The rotary excavator A of the present invention has the main body 2.
The upper part of the inner cylinder 26c is connected to the inner cylinder 26c via the connecting device 4.
Connecting rod 26e (the rod 3
(equivalent to a) and is attached by pin 5.

Further, the oil passages for supplying and discharging hydraulic oil to and from each hydraulic actuator are configured as follows. A hydraulic system 28 consisting of a hydraulic pump, an oil tank, etc. is mounted on the platform of the work vehicle 22, and a hydraulic hose pulled out from the hydraulic system 28 passes through the support stand 23 and the swing ring 24, and is connected to the swing motor 24a. Some of the hoses 29 and 30 corresponding to the telescopic motor 25b are connected at the part pulled out from the turning ring 24, and the remaining hoses are fixed at one end to a hose connector 31 attached to the horizontal telescopic arm 25, and the other end is fixed to a hose connector 31 attached to the horizontal telescopic arm 25. The end is fixed to the hose connector 32 attached to the outer cylinder 26a of the vertical telescoping arm 26, and the clamping tool 3 is attached to an elastic plate 33 attached by folding back a part.
4, the corresponding hydraulic hose 37 separated from the end of the elastic plate 33 is connected to the telescopic motor 26e of the vertical telescoping arm 26, and the outer cylinder 26a is connected to the telescopic cylinder 26d. and the top of the middle cylinder 26b, the elastic plate 3
Similarly to 3, the elastic plate 33' with a folded portion is attached with a clamp 34, and two corresponding hoses are attached to the hydraulic motor 12 of the rotary excavator A of the present invention. 36 is connected to the hydraulic hose 36 via the hose reel 35 attached to the outer cylinder 26a with an appropriate tension applied by a spring or the like provided on the hose reel 35, and as the vertical telescoping arm 26 expands and contracts, the hose reel 35 The hydraulic hose 36 is wound up and fed out from the hydraulic motor 2.

When using this excavator to bury or connect a new pipe to an existing underground pipe, first install a rotary bit with an opening at the bottom called a hole saw on the rod 26e at the lower end of the inner cylinder 26c of the vertical telescoping arm 26. A paving layer 49 made of asphalt or the like is excavated using a rotary excavator (not shown) consisting of a hydraulic motor as its driving device.

Next, to excavate the lower layer 51 that reaches the paving stone layer 50 below the pavement layer 49 or the underground pipe 54 therebelow, the rotary excavator A according to the present invention is attached to the rod 26e with the pin 5 and the hydraulic motor 12 is operated. To excavate. That is, the hydraulic motor 12 is operated while the telescopic actuator of the vertical telescoping arm 26 is operated to press the bottom of the bucket 1 against the paving stone layer 50, etc.
Excavation is carried out while rotating and taking it into the bucket 1. At this time, the end surface of the bracket 6 rotated by the excavation reaction force comes into contact with the protrusion 9 of the disc 8 of the coupling device 4, and in this state, the excavation reaction force is transmitted to the vertical telescoping arm 26. As the excavation progresses, when the bucket 1 is filled with paving stones and earth and sand, the telescopic actuator of the vertical telescoping arm 26 is moved to the rotary excavation tool A.
1 to the ground, operate the swing motor 24a, and if necessary operate the telescopic motor 25b to move the bucket 1 to the ejection position, and turn the handle 19b by hand. By disengaging the locking portion 19a and the locking pawl 20, the bottom cover 1c is opened by its own weight and the weight of the earth and sand inside to discharge soil. Excavation is performed by repeating these operations. Furthermore, buried pipe 5
In order to excavate the area near 4, rod 26
Excavation is carried out by attaching a non-rotating open/close bucket to e.

In the above embodiment, an earth drill bucket was explained as an example, but the present invention can also be applied to a drilling tool (hole saw) with an opening on the bottom surface for excavating a pavement layer. Although the present invention has been explained by taking construction work as an example, the present invention can be used for other vertical hole excavations and earth and sand discharge that require the excavation of relatively shallow, small-diameter vertical holes. Further, the excavating device of the present invention can be used not only as a working vehicle but also by attaching a vertical arm to the tip of the arm or boom of a hydraulic excavator and supporting the excavating device A on the vertical arm. Furthermore, in the present invention, even though the lifting arm, the driving device, and the excavating tool are concentric, the components other than the excavating tool do not necessarily have to be circular.

(Effects of the invention) As described above, in the present invention, the excavator main body is attached to the lower end of the lifting arm, the excavator drive device is installed inside the excavator main body, and the excavator drive device is attached to the lower part of the excavator main body. Since the rotary excavator is attached, it is possible to perform excavation by attaching the rotary excavator to the non-rotating lifting arm, eliminating the need for a rotary drive device on the top of the lifting arm, and using a dedicated support for the rotary excavator. Doesn't require Rod (Keriba). Therefore, by attaching and detaching the rotary excavation device of the present invention and other excavating tools that do not require rotation to and from the lifting arm in a compatible manner, any lifting arm can be used in common. , provides versatility.

In addition, in the excavation device of the present invention, the lifting arm, the drive device, and the excavation tool such as a bucket are arranged vertically and concentrically, so even if the drive device is relatively large compared to the excavation tool, the drive device can The device does not protrude from the outer periphery of the excavating tool, making the device compact and downsized, and there is no vibration caused by the rotation of the excavating tool when the drive device is offset from the axis of the excavating tool. Excavation can be performed accurately and efficiently. Furthermore, in the present invention, by grasping the handle of the coupling device and rotating the cylindrical body on the main body side, the pin holes can be easily aligned, and there is no need to rotate the heavy excavation tool.
It becomes easy to attach the excavation tool with the pin.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary excavation device according to the present invention, FIG. 2 is a sectional view taken along line E-E in FIG. 1, and FIG. 3 is a plan view showing a coupling device of the embodiment.
FIG. 4 is a side view showing an example of an excavator equipped with the excavator of the present invention.

Claims (1)

[Scope of utility model registration request] An excavator main body is attached to the lower end of the lifting arm via a connecting device, an excavator drive device is installed inside the excavator main body, and a rotary type that is rotationally driven by the excavator drive device is attached to the lower part of the excavator main body. In addition to attaching the excavating tool, the lifting arm, the excavating tool drive device, and the rotary excavating tool are arranged concentrically, and the connecting device is connected to the excavating device mounting rod provided at the lower end of the lifting arm. A cylindrical body provided separately from the main body is removably fitted to the upper part of the excavator main body, and both rods and the cylindrical body are connected by a pin, and an arc shape is formed on the upper part of the main body. attaching a frame bracket, forming a protrusion in the circumferential direction around the cylindrical body, and engaging the protrusion with the bracket in a rotatable but immovable manner;
A rotary excavation device characterized in that a stopper mechanism is provided to restrict a rotation range between the cylindrical body and the main body, and a handle for rotating the cylindrical body is provided on the outer periphery of the cylindrical body.