JPS6251358B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earth removal device for a bucket of an earth drill, and more particularly to a device for discharging earth and sand from the bucket by opening a bottom cover that is openable and closably attached to the bottom opening of the bucket. .

As shown in FIGS. 1 to 3, the earth drill bucket generally has a front frame 2 supported in front of the earth drill (excavator) main body 1, and a Kelly bar drive device 3 supported on the front frame 2. A Kelly bar 4 is rotatably and axially movably attached to the Kelly bar drive device 3, a bucket 5 is attached to the lower end of the Kelly bar 4 with a pin 22, and a bottom cover 6 is attached to the bottom opening of the bucket 5 using a hinge 23. The bucket 5 is attached so that it can be opened and closed freely.
The locking handle 8 is rotatably attached to the locking handle 8, and the latch 9 at the lower end of the locking handle 8 is attached to the locking hole 2 of the bottom cover 6.
4, and the bottom cover 6 is provided with a digging blade (not shown) and a notch (not shown) for taking in the excavated earth and sand. The Kelly bar drive device 3 is driven to drive the Kelly bar 4 and bucket 5.
The excavating blade of the rotating bucket 5 excavates the ground, and the excavated soil is taken into the bucket 5 through the notch, and the bucket 5 is rotated.
When the inside is filled with earth and sand, the rotation of the Kelly bar 4 and the bucket 5 is stopped, the Kelly bar 4 and the bucket 5 are raised and placed on top of the dump truck 7, etc., and the locking handle 8 is rotated to lock them. The latch 9 at the lower end of the handle 8 is released from the locking hole 24, the bottom cover 6 is opened, and the earth and sand in the bucket 5 is discharged into a dump truck 7 or the like.

A bucket 5 earth removal means of such an earth drill,
That is, the means for opening the bottom cover 6 and discharging the earth and sand in the bucket 5 is by the operator 18 grasping and rotating the locking handle 8 as shown in FIG. 2, or by rotating the locking handle 8 as shown in FIG. This is a so-called manual type in which soil is discharged by hooking it onto the locking handle 8 and rotating the locking handle 8. For this reason, a worker other than the operator of the earth drill is required to remove the soil, and since the work is performed in a place with poor footing, there is a risk of injury to the worker.

Therefore, a method of mechanically removing soil was developed. As shown in FIGS. 5 and 6, this means has an operating rod 20 fixed to the front frame 2 or the Kelly bar drive device 3, while an L-shaped lever 21 is rotatably attached to the upper edge of the bucket 5 by means of a pin. A tension spring 25 is interposed between the lever 21 and the bucket 5 to always bias the lever 21 to the state shown by the two-dot chain line. Easy 27 to Bucket 5
is movably mounted, a pin implanted in the rack 27 is engaged with the elongated hole 26, and a pinion 28 fixed to the rotating shaft of the latch 9 is engaged with the rack 27. When the inside of the bucket 5 is filled with earth and sand, the Kelly bar 4 and the bucket 5 are raised and the lever 21 is brought into contact with the operating rod 20. Then,
The lever 21 rotates in the direction of the arrow (from the two-dot chain line to the solid line) against the spring force of the spring 25, and the rack 27 moves in the direction of the arrow, and the pinion 28 and pinion meshed with the rack move in the direction of the arrow. The rotating shaft rotates, and the latch 9 is released from the locking hole 24 of the bottom cover 6, and the bottom cover 6 is opened and the earth and sand in the bucket 5 is discharged.

However, the above-mentioned earth removal device has an operating rod 20 fixed to the front frame 2 or the Kelly bar drive device 3, and a lever 2 attached to the bucket 5 side.
1. Spring 25, Rack 27, Pinion 28
Therefore, the soil removal position is limited, and the bucket 5 must always be raised to the height where the lever 21 touches the operating rod 20 every time soil is discharged. Further, regardless of the height of the dump truck 7, etc., the earth must be removed at a high position near the front frame 2, so that the earth and sand may scatter during earth removal and pollute the surrounding area. Furthermore, when using a large-diameter bucket, the operating rod 20 is connected to the lever 21.
There is a drawback that the bucket hits the front frame 2 before hitting the front frame 2, making it impossible to open the bottom cover 6.

The present invention aims to provide an earth removal device for the bucket of an earth drill which improves the above-mentioned drawbacks.

In the present invention, a cam member is mounted on the front frame so as to be movable in the axial direction of the Kelly bar, and an engaging protrusion is provided at the lower end of the Kelly bar, and when the engaging protrusion is engaged with the cam member, the cam member is moved in the axial direction of the Kelly bar. The member is provided to face the locking means, and the bottom cover is opened by rotating the bucket with the cam member facing the locking means.
Moreover, the present invention is characterized in that the soil discharge height of the bucket can be arbitrarily adjusted while the engaging protrusion remains engaged with the cam member.

An embodiment of the earth removal device in the bucket of the earth drill according to the present invention will be described below with reference to FIGS. 7 to 11.

In the figure, the same reference numerals as in FIGS. 1 to 6 indicate the same parts.

The earth removal device of the present invention in this embodiment has guide tubes 10 fixedly installed on both the left and right sides of the front frame 2 in the vertical direction, that is, in the axial direction of the Kelly bar 4, and the two guide tubes 10 on the left and right sides of the guide tubes 10 on the left and right sides. Two support rods 11 are supported on a cylinder 10 so as to be movable in the axial direction of the Kelly bar 4, and a stopper 12 is provided at the top end of the two support rods 11. This stopper 12
This prevents the support rod 11 from falling off the guide tube 10, and also maintains the height of the cam member 13, which will be described later, from the ground at a predetermined height.

A cam member 13 is attached to the lower ends of the two support rods 11 by pins 15 so as to be non-rotatable with respect to the rotation of the Kelly bar 4 and the bucket 5 and to prevent lateral vibration. That is, the cam member 13 has a substantially rectangular planar shape and a U-shaped cross section, with both ends of the upper bent piece of the main cam plate 130 being attached to the lower ends of the two guide rods 11 by pins 15. The center of the main cam plate 130 is attached to the Kelly bar 4 with a bearing 16 interposed therebetween, so that the rotating force of the Kelly bar 4 is not transmitted to the main cam plate 130. Two auxiliary cam plates 131 are housed between the upper bent piece and the lower bent piece on both sides of the main cam plate 130. Two first engagement holes 132 and two second engagement holes 133 are provided in the bent piece portion in the radial direction of the bucket bag 5, while two engagement holes 132 are provided in the two auxiliary cam plates 131.
4 is provided, and the engagement hole 134 of the auxiliary cam plate 131 is provided.
By engaging the pin 14 with the first engagement hole 132 or the second engagement hole 133 of the main cam plate 130,
Bucket 5 the auxiliary cam plate 131 to the main cam plate 130.
is movable in the radial direction, that is, the auxiliary cam plate 131
The radial length of the bucket belt 5 is configured to be switchable in two stages. Here, the main cam plate 130 and the auxiliary cam plate 131 may be provided at two or more locations on the circumference. Also, the main cam plate 1 that engages the auxiliary cam plate 131
By providing two or more 30 engagement holes, it is possible to accommodate many types of buckets with different diameters. The main cam plate 130 and the auxiliary cam plate 131
A contact surface 135 is formed by chamfering the outer end of the side on which the locking handle 8 is applied and rotated into an arc shape.

On the other hand, an engaging protrusion 17 is integrally provided at the lower end of the Kelly bar 4 below the cam member 13. Furthermore, the locking handle 8 is once bent horizontally toward the center of the bucket 5 and then vertically upward, so that when the engaging protrusion 17 engages the cam member 13, the locking handle 8 is It is configured to face the contact surface 135 of the cam member 13.

The earth removal device of the present invention in this embodiment has the above-mentioned configuration, and its operation will be explained below.

When discharging the earth and sand in the bucket 5, raise the Kelly bar 4 and the bucket 5 and touch the engagement protrusion 17.
is engaged with the lower surface of the bearing 16 of the cam member 13, and while the engagement protrusion 17 remains engaged with the cam member 13, adjust the soil discharge height of the bucket 5 to the height of the dump truck 7, etc., as appropriate. Adjust to Next, turn the bucket 5 in a direction opposite to the operating direction of the locking handle 8 (counterclockwise). Then, the locking handle 8 comes into contact with the contact surface 135 of the cam member 13, and by further turning the bucket 5 counterclockwise, the locking handle 8 rotates in the direction of the arrow (counterclockwise), and the locking handle 8 is rotated in the direction of the arrow (counterclockwise). The latch 9 at the lower end of the stop handle 8 is disengaged from the engagement hole 24, the bottom cover 6 is opened, and the earth and sand in the bucket 5 is discharged. At this time, the height of the bucket 5 can be adjusted arbitrarily within the length of the support rod 11, especially within the length from the lower guide tube 10 to the pin 15 attachment part, so that soil can be removed from a height higher than necessary. There is no risk that the earth and sand will scatter and pollute the surrounding area. In addition, since the soil is removed mechanically, it is very efficient, and it is also safe because the operator does not need to operate a bucket. Furthermore, soil can be removed by simply raising the bucket 5 until the locking handle 8 faces the cam member 13 located below the front frame 2, and the bucket 5 can be lifted until it is located directly below the front frame 2. There's no need to do it. Therefore, even if the bucket 5 has a large diameter, there is no risk that the bucket 5 will hit the front frame 2 before the locking handle 8 faces the cam member 13 and become unable to discharge soil. .

When closing the opened bottom cover 6, it is done by simultaneously rotating the earth drill body 1 and lowering the bucket 5, as in the conventional case. First, the bucket 5 is rotated to align the turning direction of the earth drill body 1 with the closing direction of the bottom cover 6. That is, the hinge portion between the bucket 5 and the bottom cover 6 is aligned with the rotating direction of the earth drill body. Next, the bucket 5 is lowered to bring the bottom cover 6 into contact with the ground. At this time, it is necessary to lower the bucket bag 5 so that the locking handle 8 does not oppose (contact) the cam member 13. In addition, by adjusting the length of the support rod 11 or the mounting position of the stopper 12, it is possible to prevent the cam member 13 from lowering more than necessary and to prevent the locking handle 8 from facing (abutting) the cam member. It's big. This is because if the bucket bag 5 is rotated with the locking handle 8 facing the cam member 13, the opening operation of the bottom cover 6 will work and the bottom cover 6 will not be able to be closed. Then, earth drill body 1
By lowering the bucket 5 while further rotating the bucket, the latch 9 engages with the engagement hole 24 of the bottom cover 6, and the bottom cover 6 is closed.

If the diameter of the bucket 5 changes and, for example, it becomes large and the position of the locking handle 8 is located away from the Kelly lever 4, the pin 14 is inserted between the first engagement hole 132 of the main cam plate 130 and the auxiliary cam plate 13.
1 from the second engagement hole 134 of the auxiliary cam plate 131, the auxiliary cam plate 131 is made to protrude from the main cam plate 130, and the pin 14 is inserted again into the second engagement hole 133 of the main cam plate 130 and the engagement hole 134 of the auxiliary cam plate 131. By engaging, the radial length of the contact surface 135 of the cam member 13 from the center of rotation of the bucket belt 5 can be increased, and the locking handle 8 can be moved away from the Kelly bar 4 with the bucket belt 5 having a large diameter. Earth can be removed even if the soil is contaminated.

As is clear from the above embodiments, the soil removal device of the present invention can adjust the height of the bucket, so if the soil removal height is set higher than necessary, the soil will scatter and pollute the surrounding area. There is no risk of it getting wet. In addition, since the cam member and locking handle are operated below the front frame, even if the bucket has a large diameter, the bucket will hit the front frame and remove soil before the locking handle faces the cam member. There is no risk that it will become impossible to do so.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the entire earth drill, Fig. 2 is a plan view showing a conventional manual bucket soil removal device, Fig. 3 is a sectional view taken along the line - - in Fig. 2, and Fig. 4 is also a conventional earth drill. FIG. 2 is a plan view showing a manually operated bucket. FIG. 5 is a partial side view showing a conventional bucket soil removal device, and FIG. 6 is an enlarged view of a portion of FIG. 5. 7 to 11 show an embodiment of the bucket soil removal device of the present invention, FIG. 7 is a side view, and FIG. 8 is a state before engagement of the cam member and the locking handle. FIG. 9 is a partially cutaway front view showing the state of engagement between the cam member and the locking handle, FIG. 10 is a sectional view taken along the line -- in FIG. 9, and FIG. FIG. DESCRIPTION OF SYMBOLS 1... Earth drill body, 2... Front frame, 3... Kellyba drive device, 4... Kellyba, 5...
Bucket, 6... Bottom lid, 8... Locking handle, 9... Latch, 10... Guide cylinder, 11... Support rod, 12... Stopper, 13... Cam member, 130... Main cam plate, 1
31... Auxiliary cam plate, 132... First engagement hole, 133
...Second engagement hole, 134...Engagement hole, 14...Pin, 1
5... Pin, 16... Bearing, 17... Engaging protrusion,
22...Pin.

Claims (1)

[Scope of Claims] 1. An earth drill body, a front frame supported by the earth drill body, a Kelly bar drive device supported by the front frame, and a device rotatably and axially movably mounted on the Kelly bar drive device. a kelly bar, a bucket attached to the lower end of the kelly bar, a bottom lid attached to the bottom opening of the bucket so as to be openable and closable, and a bottom lid provided on the bucket,
and a locking means removably locked to the bottom cover,
Driving the driving part to rotate the kelly bar and the bucket, excavating the ground by rotating the bucket, and taking the excavated earth and sand into the bucket, and then releasing the locking state of the locking means to the bottom cover. In an earth drill bucket configured so that the bottom cover opens and the earth and sand in the bucket is discharged, a support rod is supported on the frame so as to be movable in the same direction as the axial direction of the Kerry bar, and the top end of the support rod is A stopper is provided on the support rod to prevent the support rod from falling off from the frame, and a cam member is attached to the lower end of the support rod so as to be unrotatable with respect to the rotation of the Kelly bar and the bucket. An engaging protrusion is provided at the location, and the locking means is formed so as to face the cam member when the kely bar and the bucket are raised and the engaging protrusion is engaged with the cam member. By rotating the bucket while facing the cam member, the locking state of the locking means to the bottom cover is released, the earth and sand in the bucket is discharged, and the engaging protrusion engages with the cam member. An earth removal device for a bucket of an earth drill, characterized in that the height of releasing the locking means of the bucket can be arbitrarily adjusted within the movable length of the support rod. 2. The cam member consists of a main cam attached to the support rod and an auxiliary cam attached to the main cam so that it can move in the radial direction of the bucket, so that it can always face the locking means whose position differs depending on the type of bucket. An earth removal device in a bucket of an earth drill according to claim 1, characterized in that: