JPH0324709Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an earth drill bucket, which has a bottom cover that is openable and closable and has an opening for introducing earth and sand on the lower surface, and has a motor for rotating the bucket.

(Problems to be Solved by Prior Art and Ideas) Conventional earth drill buckets are generally 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. By rotating the bucket, dirt is drawn into the bucket through the opening in the bottom cover, and a vertical hole corresponding to the diameter of the bucket is dug. Compared to open/close type buckets such as
Vertical notches with a circular cross-sectional shape are often used, especially when excavating vertical holes for pile driving.

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.

As a conventional earth drill bucket,
- Like the one proposed in Publication No. 38466, a rope hanging type motor is installed on the top of the bucket concentrically with the bucket, and the reaction force receiving member is driven into the hole wall by the excavation reaction force itself. There is one that is constructed so that the excavation reaction force is absorbed by the hard hole wall. Furthermore, in Japanese Patent Application Laid-open No. 55-59293, a motor is attached to the lower end of a non-rotating Kelly bar supported on the ground concentrically with the Kelly bar, and an output shaft of the motor that protrudes downward is detachably attached to a bucket shaft. A combination is proposed.

However, these conventional earth drill buckets with a motor have a structure in which the bucket shaft is directly connected concentrically with the output shaft of the motor, and the rotational speed and output torque are determined by the motor, depending on the soil quality. Therefore, there is a problem in that it is necessary to provide a large motor with a large output to match the hard soil. Further, since the motor is connected in series with the connecting part to the supporting member such as the kely bar, the total height is increased and stability is deteriorated.

In view of the above-mentioned problems, the present invention provides an earth drill bucket with a motor that can easily provide various torques and rotation speeds depending on the soil quality, has good stability, and can use a small motor. The purpose is to

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a connecting shaft that is removably connected concentrically to the lower end of the lifting arm;
A bucket belt rotating motor is attached adjacent to the side of the connecting shaft via a bracket fixed to the connecting shaft, and a bucket belt shaft is installed below the connecting shaft coaxially with the connecting shaft via a bearing. , comprising a reduction gear provided between the bucket shaft and the motor, and an earth drill bucket main body coupled to a lower part of the bucket shaft.

(Example) An example of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of the earth drill bucket with a motor of the present invention. Reference numeral 1 denotes a connecting shaft connected to the lifting arm, and the connecting shaft 1 has a cylindrical part 1b provided with a pin hole 1a in the upper part for attachment to the lifting arm of an excavator, and the lower end of the cylindrical part 1b. It has a structure in which a rotation drive device mounting bracket 1c is formed to protrude from one side.

Reference numeral 2 denotes a hydraulic motor for rotating the bucket.The hydraulic motor 2 is fixedly attached to the bracket 1c by a bolt 3 by fitting a part into a mounting hole 1d provided in a protruding portion of the bracket 1c.

4 and 5 are gears that reduce and transmit the rotation of the hydraulic motor 2 to the earth drill bucket main body 6;
One gear 4 is the output shaft 2a of the hydraulic motor 2.
The other gear 5 is fitted onto a bucket shaft 17 fixed by a bolt 12 to the center of the upper plate 6a of the cylindrical bucket main body 6, and these gears 4 and 5 are fitted onto the bracket 1c. They are housed in the upper and lower frames 8 and 9 to be attached, and are attached so as to mesh with each other. That is, the upper frame 8, which has a cylindrical shape with a bottom, is attached to a flange portion 8a by bolts 7, 3 to a bracket 1c fixed to the connecting shaft 1.
The bottomed cylindrical lower frame 9 is attached by aligning the flange portion 9a with the lower flange 8b of the upper frame 8, and tightening bolts 10 and nuts 11.
The hydraulic motor 2
The gear 4 fitted onto the output shaft 2a is prevented from coming off by a shaft 2b coaxially connected to the shaft 2a,
Positioning is performed by a cylindrical body 4a that contacts the top surface of the gear 4 and is fitted onto the output shaft 2a (the cylindrical body 4a is rotatably inserted into a circular hole 8d provided in the bottom plate portion 8c of the upper frame 8). The lower end of the shaft 2b is rotatably supported by a bearing 13 attached to the bottom plate portion 9b of the lower frame 9. bucket shaft 1
7 is rotatably supported by a bearing 14 provided on the bottom plate 8c of the upper frame 8 and a bearing 15 provided on the bottom plate 9b of the lower frame 9.
A ring 16 fixed to the upper end of the bearing 14 is placed on the upper surface of the inner peripheral side of the bearing 14 to prevent it from coming off.

Similar to the conventional earth drill bucket, the bucket body 6 has a bottom lid 6b attached to the bottom opening via a hinge 18 so as to be openable and closable, and on the opposite side of the hinge 18 is a bottom lid locking rod 19 at the lower end. Locking part 19a
A locking pawl 20 is attached to the bottom cover 6b, and the bottom cover 6b has an opening 6c for introducing earth and sand in the radial direction thereof, and a pawl 6d for introducing earth and sand is provided on the edge of the opening 6c. There is. In addition, 19b is a handle for rotating the rod provided at the upper end of the locking rod 19;
Reference numeral 21 denotes a spring that biases the rod 19 in the direction of engaging the locking pawl 20.

Figures 2 and 3 are examples of excavators that use this earth drill bucket with a motor. An example is shown below. This excavator has a support stand 23 installed on the loading platform of a traveling vehicle 22, a swing wheel 24 having a swing motor 24a mounted on the support stand 23, and a hydraulic cylinder drive system or a The telescopic motor 25 attached to the outer cylinder 25a as shown in
A horizontal telescoping arm 25 is attached that employs a rack and pinion drive system for engaging a pinion (not shown) rotated by a pinion (not shown) with a rack 25d attached to the side surface of the inner cylinder 25c. The horizontal telescoping arm 2
At the tip of the inner cylinder 25c of No. 5, there is a vertical telescoping arm 26.
is attached, and the vertical telescoping arm 26 is attached to the inner cylinder 2.
an outer cylinder 26a fixed to the outer cylinder 5c; a middle cylinder 26b slidably fitted into the outer cylinder 26a;
The inner cylinder 26c is slidably fitted into the outer cylinder 26a.
The operating system is a rack and pinion system in which the rod is moved up and down by meshing with a pinion 26f that is rotated by the rod.The expansion and contraction of the middle cylinder 26b and the inner cylinder 26c is achieved by connecting the head to the middle cylinder 26b and connecting the piston rod to the inner cylinder 26c. These cylindrical bodies 26b are connected together,
It is configured to be expanded and contracted by a telescopic cylinder 26g housed within 26c. In the motorized earth drill bucket of the present invention, the upper cylindrical portion 1b of the connecting shaft 1 is fitted into a connecting rod 26h provided at the lower end of the inner cylinder 26c, and is attached by a pin 27.

Further, the oil passages for supplying and discharging hydraulic oil to and from each hydraulic actuator are configured as follows. A hydraulic system 28 including a hydraulic pump and an oil tank is installed on the platform of the traveling vehicle 22, and a hydraulic hose pulled out from the hydraulic system 28 is connected to a support stand 23.
and the inside of the turning wheel 24, and the turning 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 a part is folded back and fixed to the elastic plate 33 attached at intervals with a clamping tool 34. The corresponding hydraulic hose 37 separated from the end of the elastic plate 33 is connected to the telescopic motor 26e of the vertical telescopic arm 26, and the outer cylinder 26a is connected to the telescopic cylinder 26g.
The elastic plate 33', which has a folded part similar to the elastic plate 33, is attached between the top of the middle cylinder 26b and the top of the middle cylinder 26b, and is attached to the elastic plate 33' by a clamping tool 34. For the motor 2, two corresponding hoses 36 are connected to the hydraulic motor 3 via a hose reel 35 attached to the outer cylinder 26a.
The hydraulic hose 36 is connected to the hose reel 35 with an appropriate tension by a spring or the like provided on the hose reel 35, so that the hydraulic hose 36 is wound up and fed out from the hose reel 35 to the hydraulic motor 2 as the vertical telescoping arm 26 expands and contracts. It's getting old.

In this excavator, when burying or connecting a new gas pipe to an existing gas pipe, first attach the pin 27 to the rod 26h at the lower end of the inner cylinder 26c of the vertical telescoping arm 26, as shown in FIG. A rotary excavator 38 consisting of a rotary bit 38a with an opening at the bottom and a hydraulic motor 38b serving as its driving device.
The pavement layer 39 made of asphalt or the like is excavated using the excavator.

Next, the paving stone layer 4 under which excavated material cannot be discharged by the rotary excavator 38 under the paving layer 39.
0, and the earth drill bucket A with a motor according to the present invention is replaced with the rotary drilling tool 38 by the rod 26.
h by a pin 27 and excavation is performed by operating the hydraulic motor 2. That is, either the telescopic motor 26f of the vertical telescoping arm 26 is operated to lower the middle cylinder 26b, or the hydraulic cylinder 26
By extending g, the hydraulic motor 2 is pressed while pressing the bottom part of the bucket main body 6 against the paving stone layer 40.
This causes the bucket 6 to rotate via the gears 4 and 5, and while the paving stones are dug up by the claws 6d, they are taken into the bucket 6 through the opening 6c and excavated. During this excavation, the excavation reaction force is received by the horizontal telescoping arm 25 via the vertical telescoping arm 26. As the excavation progresses, when the bucket main body 6 is filled with paving stones, the bucket main body 6 is raised above the ground by operating the telescopic motor 26f in the upward direction of the motorized earth drill bucket A or by contracting the hydraulic cylinder 26g. , operate the swing motor 24a and, if necessary, operate the telescopic motor 25b to move the bucket main body 6 to the soil unloading position, and rotate the handle 19b by hand to connect the locking portion 19a and the locking pawl 20. By releasing the engagement, the bottom cover 6b is opened by its own weight and the weight of the earth and sand inside, and the earth is discharged.

After excavating and removing the earth from the paving stone layer 40, the paving stone layer 41 is excavated using a motorized earth drill bucket A, and a casing 43 as shown in FIG. 5 is fitted into the excavated vertical hole. After excavating with the motor-equipped earth drill bucket A to a depth close to the existing gas pipe 44 (the position of the gas pipe 44 has been checked in advance before excavation), As shown in Figure 5, to the depth reaching the existing gas pipe 44, a vertical push type opening/closing bucket 42, which is less likely to damage the gas pipe, is attached to the rod 26h instead of the motorized earth drill bucket A. Carry out excavation. Thereafter, both sides of the gas pipe 44 are excavated by attaching to the rod 26h a special excavation bucket developed by the present inventor, which has a structure that straddles the gas pipe 44. A remote-controlled horizontal hole drilling device for inserting a new gas pipe using a U-Drill may be installed and guided by the casing 43 to move it up and down.

In this way, the earth drill bucket with motor A
Since the rotation drive device (hydraulic motor 2 and reduction gears such as gears 4 and 5) for the bucket main body 6 is provided on the connecting shaft 1 of the It is possible to perform excavation, there is no need to provide a rotary drive device to the vertical telescoping arm 26, which is an elevating arm, and there is no need for a support rod (Keriver) dedicated to the earth drill bucket. Therefore, the vertical telescoping arm 2
6, by interchangeably attaching and detaching the rotary excavator 38 dedicated to the pavement layer, the motorized earth drill bucket A of the present invention, and other excavating tools 42 that do not require rotation, Vertical telescoping arms 26 can be used in common.

FIG. 6 shows another embodiment of the present invention, in which the shaft 17 of the bucket main body 6 is provided coaxially with the connecting shaft 1, and two hydraulic motors 2, 2', these hydraulic motors 2,
Gears 4 and 4' that are fitted onto and rotated by the output shafts 2a and 2a' of 2' and meshed with the gear 5 are arranged symmetrically with respect to the bucket shaft 17. The structure is such that the center of gravity of the excavating tool does not become eccentric. With this structure, there is no fear that the bucket main body 6 will be misaligned, and the hole can be drilled in the desired direction. Therefore, a small hydraulic motor 2 can be used.

In the above embodiments, the present invention has been explained by taking gas pipe construction as an example, but the present invention can be used for other types of vertical hole excavation.

(Effects of the invention) As described above, in this invention, since the earth drill bucket is equipped with a motor for rotating the bucket, the lifting arm can be used interchangeably with other excavating tools that do not require rotation. By attaching and detaching it, you can use any lifting arm in common, which not only provides versatility, but also has a motor on the side of the connecting shaft, which connects the bucket main body via a speed reduction device. Since it is configured to rotate, by selecting the reduction ratio of the reduction gear, the rotational speed and torque of the bucket main body can be set to those suitable for the soil quality. In addition, since a reduction gear was used,
A small motor can be used and the motor can be easily installed within the radius of the bucket body. Also,
Since the motor is attached to the side of the connecting shaft, the total height of the earth drill bucket including the motor can be reduced, resulting in good stability.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of an earth drill bucket with a motor according to the present invention, Fig. 2 is a side view of an excavator equipped with the earth drill bucket with a motor according to the embodiment, and Fig. 3 is a side view of an excavator equipped with the earth drill bucket with a motor according to the present invention. Rear view of Figure 2, No. 4
5 and 5 are cross-sectional views showing the vertical telescoping arm of the excavator shown in FIGS. 2 and 3 with other digging tools attached, and FIG. 6 is another example of the earth drill bucket with a motor according to the present invention. FIG. 3 is a longitudinal cross-sectional view showing an example.

Claims (1)

[Scope of utility model registration request] A connecting shaft concentrically and removably connected to the lower end of the lifting arm, a bucket rotation motor attached adjacent to the side of the connecting shaft via a bracket fixed to the connecting shaft, a bucket shaft coaxially attached to the connecting shaft via a bearing;
1. An earth drill bucket cart with a motor, comprising: a reduction gear provided between the bucket shaft and the motor; and an earth drill bucket main body coupled to a lower part of the bucket shaft.