JPH0426552Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a leader that is used in construction machines for foundation work such as hydraulic excavators and guides the lifting and lowering of working attachments such as earth augers.

B. Prior Art FIG. 6 shows a conventional example in which this type of reader is equipped with an auger reducer. In FIG. 6, a construction machine body 1 for foundation work is provided with a telescopic stay 2, and a first leader 4a is attached to the free end of the stay 2 via a bracket 3. This first
The upper end of the intermediate leader 4b is attached to the lower end of the leader 4a, and the second leader 4c is attached to the lower end thereof. This second leader 4c is connected to the bracket 1
It is fixed to the main body 1 via a. On the other hand, an upper leader 4d is attached to the upper end of the first leader 4a,
The leader 4 is constituted by the first leader 4a, intermediate leader 4b, second leader 4c, and upper leader 4d. The main body 1 is also provided with a winch 12, and the wire rope 9 wound around the winch 12 has its tip connected to the auger reducer 5 via a sheave 11 at the tip of the leader. The auger reducer 5 is guided by the leader 4 and can move up and down, and a screw 6 for excavation is attached to the output shaft of the auger reducer 5 so as to face downward. Power for the auger reducer 5 is supplied through a connecting member 8 from a power source 7 such as a power source or a hydraulic power source installed in the main body 1 . Note that 10 is a top bracket that supports the sheave 11.

To perform excavation work using the earth auger device configured as described above, first, the auger reducer 5 is driven to rotate the screw 6, and then the wire rope 9 is let out to move the auger reducer 5 along the leader. lower it. As a result, the screw 6 is pressed against the ground by the weight of the auger reducer 5, and a hole is bored.

C. Problems to be solved by the invention In the conventional leader, depending on the depth of the hole to be excavated, the intermediate leader 4b and the upper leader 4d are connected or removed at the work site, and the upper and lower parts of the auger reducer 5 are connected or removed. Adjusting the range of motion. Further, during transport, the first leader 4a, intermediate leader 4b, second leader 4c, upper leader 4d, and top bracket 10 are removed. These leaders 4
The installation and removal of the top bracket 10 is done using dozens of bolts, which is troublesome and time-consuming, and cannot be done manually; a crane or the like is required, which increases the cost of the work. It becomes huge. Furthermore, each reader must be disassembled and transported individually, which incurs significant shipping costs.

Furthermore, the digging force during work is reduced by the auger reducer 5.
This is achieved only by the weight of the screw 6, so if the ground is hard, the screw 6 will not dig into the ground and will not be able to dig sufficiently.

An object of the present invention is to provide a telescoping leader for construction machinery that solves the above-mentioned problems by using a multi-stage telescoping leader.

D Means for Solving the Problems To explain with reference to FIGS. 1 and 4 showing an embodiment, the present invention is a construction machine that is attached to a foundation construction machine 1 and guides the lifting and lowering of work attachments 32 and 33. Applicable to mechanical telescopic readers. The above-mentioned problem is caused by the first leader 21 attached to the foundation construction machine 1, the second leaders 22-24 that extend and contract with respect to the first leader 21, and the second leaders 22-24 that extend and contract with respect to the first leader 21. Driving means 4 for expanding and contracting 24
1 to 43, and a mounting member 24a provided on the second leader 24 to which working attachments 32 and 33 are attached, and the first and second leaders 21 to
23 through which the mounting member 24a passes through the guide hole 21d~
23d.

E. Effect An embodiment in which the present invention is applied to an auger reducer and a leader for guiding a screw will be described.

In carrying out excavation work, first, each driving means 41 to 43 is expanded and contracted to move the first and second leaders 21.
24 is determined, and the screw 33 is brought into contact with the ground. Screw 3 by auger reducer 32
3, the second readers 22 to 24 are rotated.
When the mounting portion 24a is contracted, each guide hole 22d
It passes through ~21d and descends. This causes the screw 33 to descend and excavate the ground. During transportation, the second leaders 22 to 24 are contracted to minimize the overall length of the leaders as shown in FIG.

F. Example An example of the present invention will be described based on FIGS. 1 to 5.

In FIG. 1 showing the internal structure of the telescoping leader and FIG. 2 showing its top view, the telescoping leader has a second-stage leader 22 telescopically inserted into the first-stage leader 21, and a three-stage leader 22 in the second-stage leader 22. A stage leader 23 is inserted into the third stage leader 23 so as to be extendable and retractable, and a fourth stage leader 24 is inserted into the third stage leader 23 so as to be vertically movable. Each leader 21 to 24 has a rectangular cross section, and the first cylinder 4
The cylinder 1, the second cylinder 42, and the third cylinder 43 extend and contract each other.

Base ends of a pair of first cylinders 41 are fixed to both ends of the bottom plate 21 a of the first-stage leader 21 . Piston rod 41a of this first cylinder 41
is the side chamber 2 provided at both ends of the two-stage leader 22.
2a is fixed to the top plate 22b, and the piston rod 4
Due to the expansion and contraction of 1a, the second stage leader 22 becomes the first stage leader 2.
Expands and contracts with respect to 1. Bottom plate 22 of two-stage leader 22
c, a pair of second chambers are provided inside the left and right side chambers 22a.
The base end portions of the cylinders 42 are each fixed. The piston rod 42 of this second cylinder 42
The tip a is fixed to a top plate 23b of a side chamber 23a provided at both ends of the third leader 23, and the third-stage leader 23 expands and contracts with respect to the second-stage leader 22 as the piston rod 42a expands and contracts. Here, these 1~
One side P1, P2, P3 of three-stage leaders 21 to 23
A guide hole 21 of the same shape is cut from the upper end.
d, 22d, and 23d are formed respectively, and the first stage ~
When the three-stage leaders 21, 22, and 23 are contracted, the respective guide holes 21d, 22d, and 23d overlap.

Further, the base end of a third cylinder 43 is fixed to the center of the bottom plate 23c of the third stage leader 23, and the tip of the piston rod 43a of the third cylinder 43 is
It is fixed to the four-stage leader 24. The expansion and contraction of the piston rod 43a causes the fourth stage leader 24 to move up and down within the third stage leader 23. 4-stage leader 24
As shown in FIG. 2, an attachment mounting portion 24a that can protrude from the guide holes 21d to 23d of each leader 21 to 23 is provided, and a working attachment AT such as an auger reducer is attached to this attachment mounting portion 24a. It will be done. Furthermore, a stay attachment part 21e and a leader support part 21f are attached to the back surface of the first leader 21, respectively. The above 1st to 4th stage leaders 21 to 24 and the first to third
The cylinders 41 to 43 constitute a telescoping leader.

FIG. 4 shows an example in which the above-mentioned telescopic reader is attached to the main body 1 for foundation work. Upper rotating body 1a of main body 1
The stay 31 provided with the stay attachment part 21e
The upper part of the first stage leader 21 is connected through the bracket 1 provided at the front part of the upper revolving body 1a.
b is connected to the first stage leader 2 via the leader support section 21f.
The lower part of 1 is connected. An auger reducer 32 is attached to the attachment mounting portion 24a of the four-stage leader 24.
is attached, and a screw 33 is attached to its output shaft.

In the above embodiment, the first stage leader 21 is the first
2nd to 4th stage leaders 22 to 24 are the second
The attachment mounting portion 24a constitutes a mounting member, and the first to third cylinders 41 to 43 constitute a driving means.

Next, the operation of the embodiment will be explained.

In order to perform excavation work using the construction machine configured as described above, first, the cylinders 41 to 43 are expanded and contracted to determine the total length of the first to fourth stage leaders 21 to 24, and the screw 33 is set to a predetermined height. The screw 33 is set above the predetermined excavation position. Thereafter, the length of each leader 21 to 24 is adjusted to bring the screw 33 into contact with the ground. Next, after driving the auger reducer 32 and rotating the screw 33,
2 by contracting the first and second cylinders 41 and 42.
The stage and third stage leaders 22 and 23 are contracted, and the third cylinder 43 is further contracted to lower the fourth stage leader 24. As a result, the screw 33 descends while rotating to excavate the ground. At this time, the attachment mounting portion 24a is attached to each guide hole 21d, 22
d, 23d, and as shown in Figure 3, the second stage,
Excavation is possible until the third-stage leaders 22 and 23 are completely retracted and the fourth-stage leader 24 is completely lowered. Note that the expansion and contraction of each cylinder 41 to 43 is adjusted as appropriate depending on the length of the screw 33.

In addition, when transporting the above-mentioned hydraulic excavator,
As shown in the figure, if the 2nd to 4th stage leaders 22 to 24 are completely retracted, there is no need to remove the leaders.
Work efficiency is good. Additionally, safety can be improved by fully deflating the device when moving around the site and at the end of work.

In this embodiment, a cylinder is attached to each reader, but a multi-stage cylinder or a parent-child cylinder may also be used. Further, the number of reader combinations is not limited to four stages. moreover,
The cross-sectional shape of the leader does not have to be rectangular.

G. Effects of the invention According to the invention, since the leader is made multi-stage telescoping, there is no need to disassemble and assemble the reader during work or transportation, improving work efficiency and reducing transportation costs. Further, when the leader is expanded and contracted by the driving means, the weight of the construction machine body can be applied to the working attachment, so that work such as excavation can be easily performed even on hard ground.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 shows a cross section of a reader according to this invention, and FIG.
A sectional view taken along line I-I in the figure, Figure 2 is a plan view of Figure 1,
FIG. 3 is a sectional view showing the leader in a contracted state;
FIGS. 4 and 5 are side views showing the leader mounted on a foundation construction machine, with FIG. 4 showing the leader when it is extended and FIG. 5 showing the leader when it is retracted. FIG. 6 is a diagram showing a conventional example corresponding to FIG. 4. 21...1st stage leader, 21d...1st guide hole,
22...Two-stage leader, 22d...Second guide hole, 2
3...3rd stage leader, 23d...3rd guide hole, 24
...Four stage leader, 24d... Attachment mounting body, 32... Auger reducer, 33... Screw,
41...first cylinder, 42...second cylinder,
43...Third cylinder.

Claims (1)

[Scope of Claim for Utility Model Registration] A telescoping leader for a construction machine that is attached to a foundation construction machine and guides the lifting and lowering of a working attachment, comprising: a first leader that is attached to the foundation construction machine; a second leader that extends and contracts with respect to the first leader; a driving means that extends and contracts the second leader; and a mounting member that is provided on the second leader and to which the working attachment is attached; . A telescoping leader for construction machinery, characterized in that a second leader is formed with a guide hole through which the mounting member passes.