JP2002003170A - Extensible arm of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize the space inside an extensible arm by reducing the space exclusive for treating the ends of an extension or retraction rope. SOLUTION: The end 19a of the retraction rope 19 is inserted into a rope insertion hole formed in a pad carrier 29 for attaching a pad 27 and fixed to a carrier end plate 31. The carrier end plate 31 is made to abut to the top surface of an arm body 10 so that the tension force of the rope is shared by the top surface of the arm body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a telescopic arm of a construction machine such as a telescopic arm of a deep hole excavator or a telescopic boom of a crane.

[0002]

2. Description of the Related Art A conventional technique will be described by taking a deep hole excavator as an example.

[0003] In the deep hole excavator, as shown in Fig. 4, an upper revolving unit 2 is mounted on a crawler type lower traveling unit 1 so as to be rotatable around a vertical axis. Mounted and configured.

The excavator A includes a boom 3 attached to the upper swing body 2 so as to be able to move up and down, and a telescopic arm (extendable and retractable) attached to the tip of the boom 3 so as to be rotatable up and down around a horizontal axis 4. Arm) 5, a clam cell type bucket 6 attached to the tip of the arm 5, and a boom cylinder 7, a boom 3 and an arm for raising and lowering the boom 3 between the upper swing body 2 and the boom 3. 5, an arm rotating cylinder 8 for rotating the arm 5 and a bucket cylinder 9 for opening and closing the bucket 6 between the arm 5 and the bucket 6.
Are provided respectively.

[0005] The arm 5 is configured to be telescopically extendable and retractable by a plurality of stages of cylindrical arms. Here, a case of a three-stage system including first, second, and third arm bodies 10, 11, and 12 in order from the base end side is illustrated, and the case of the three-stage system will be described below.

In this excavator, (a) excavating with a bucket 6 with the arm 5 standing as shown by a two-dot chain line in FIG. 4 and (b) a boom 3 and an arm as shown by a solid line in FIG. When the arm 5 is raised, the operation of dumping the scooped soil into the bucket 6 is repeated while expanding and contracting the arm 5 as needed, thereby excavating a deep hole.

As shown in FIG. 5, the arm 5, as shown in FIG. 5, has a first, second, and third arm bodies 10, 11, and 12 which are successively slidably fitted with the base end side outward. It is configured to be extendable and retractable, and is driven to expand and contract by an extendable cylinder 13, a rope-type extending mechanism 14 and a reducing mechanism 15.

The telescopic cylinder 13 has the rod side attached to the first arm body 10 and the cylinder tube side attached to the second arm body 11, respectively. To expand and contract.

The rope-type extension mechanism 14 is configured to
Rope guide sheave 16 for extension provided at the tip of
And an extension rope 17 wound around the sheave 16 in a folded state.

The extension rope 17 has one folded end at the distal end of the first arm body 10 and the other folded end at the third end.
When the second arm 11 is extended by the rope type extension mechanism 14, the extension force is transmitted to the third arm 12 so that the arm 12 is simultaneously extended. Operate.

The rope-type reduction mechanism 15 includes a second arm 1
1 rope guide sheave 18 provided at the base end
And a reduction rope 19 wrapped around the sheave 18 in a folded state.

The reducing rope 19 has one folded end at the tip of the first arm body 10 and the other folded end at the third end.
The rope-type reduction mechanism 15 is fixed to the base end of the arm body 12, and when the second arm body 11 is reduced, the reduction force is transmitted to the third arm body 12 and the arm body 12 is simultaneously reduced. Operate.

[0013]

However, according to the conventional arm 5 using such a rope-type extending / reducing mechanism 14, 15, the following problems have occurred with respect to the terminal processing of the ropes 17, 19.

First arm body 1 in reduction rope 19
A description will be given taking a terminal portion (hereinafter referred to as a rope end) that is fixed to the leading end of the zero as an example.

As shown in FIGS. 6 and 7, the rope end (usually formed by attaching a metal sleeve to the rope end,
The threaded portion 19 a is provided on the distal end side) 19 a is fixed to a rope end bracket 20 attached to the distal end portion of the first arm body 10 by a nut 21.

On the other hand, pads 22, 22 for slidably supporting the second arm body 11 are mounted on the distal end of the first arm body 10 on both right and left sides via pad carriers 23, 23, respectively. ing.

An oil hose 2 for supplying and discharging pressurized oil to and from a bucket cylinder 9 shown in FIG.
4 and 24, one of which is a hose end 24a,
Hose connectors 25, 25 for connecting the arm 24 a to a pipe outside the arm (not shown) are also provided at the distal end of the first arm body 10.

As described above, the distal end portion of the first arm body 10 is a dense portion of a number of members, so that there is no room for space, and the rope end 19a also sewes a gap between other members to sew the distal end of the first arm body. It is fixed to the part.

Therefore, since the reduction rope 19 is disposed close to the oil hose 24 in the first arm body 10, there is a problem that the reduction rope 19 and the oil hose 24 may interfere with each other and be damaged. There is.

The position where the rope end 19a is fixed is restricted to a substantially central portion in the width direction of the first arm body 10 as shown in the figure, and the position of the rope end 19a relative to the position of the guide sheave 18 (one end in the arm width direction) shown in FIG. Due to the difference, the fleet angle of the rope 19 increases, the rope load increases, and the life of the rope decreases.

Among these, as means for preventing the above-mentioned interference between the rope 19 and the oil hose 24, there is disclosed in Japanese Unexamined Utility Model Publication No.
As shown in No. 1, it is conceivable to provide a pipe-shaped rope guard in the arm and pass the rope 19 through the rope guard.

However, according to this means, a space for the rope guard is further required in the arm, so that the method cannot be applied to an arm which cannot take this space. Further, the addition of the rope guard increases the number of parts and the number of assembling steps to increase the cost, and also causes a number of adverse effects such as an increase in the arm weight and a reduction in the working capacity.

Therefore, the present invention can reduce the dedicated space for the terminal treatment of the extension or contraction rope, and can effectively use the space in the cylinder, thereby preventing interference between the rope and other objects (especially oil hoses). An object of the present invention is to provide a telescopic arm of a construction machine that can prevent the fleet angle of the rope and can reduce the fleet angle of the rope, and does not cause any adverse effects such as when a rope guard is added.

[0024]

According to a first aspect of the present invention, a plurality of adjacent cylinders are slidably engaged with each other so as to be telescopically expandable and contractable. A pad for slidably supporting the inner cylinder is attached to the inner surface of the distal end of the outer cylinder of the body via a pad carrier, and a folding guide for extending or contracting a specific cylinder by the telescopic cylinder. In a telescopic arm of a construction machine configured to transmit to another cylinder by a rope that is folded back between the cylinders in a folded state via a member to simultaneously extend or reduce the other cylinder, Of these, a rope carrier is provided in a pad carrier provided at the distal end of the cylindrical body to which the terminal of the rope is fixed, and a rope through hole is provided penetrating in the longitudinal direction of the cylindrical body. It is passed through a through hole in which attached stopped the tubular member distal end.

According to a second aspect of the present invention, in the configuration of the first aspect, a carrier end plate is provided at an end of the pad carrier provided with a rope through hole on the distal end side of the tubular body, and the rope terminal is passed through the rope through hole. Are fixed to the carrier end plate in a penetrating state.

According to a third aspect of the present invention, in the configuration of the second aspect, the end plate of the pad carrier is provided so as to abut on the distal end surface of the cylindrical body provided with the pad carrier.

According to the above configuration, since the rope terminal is fixed to the tip of the cylinder within the space occupied by the pad carrier, it is not necessary to secure a space dedicated to fixing the rope terminal in a narrow cylinder.

Accordingly, the space in the cylinder can be widely used, and a sufficient gap can be secured between the rope and another object (particularly, an oil hose disposed close to the rope). Can be prevented.

Further, since the rope can be disposed on the same side as the rope guide sheave in the width direction of the cylinder, the fleet angle of the rope is reduced as compared with the conventional one, and the load on the rope is reduced. The life can be improved.

In addition, since the pad carrier can also be used as a rope guard, and there is no need to add a dedicated rope guard such as a pipe for preventing interference, the number of parts and the number of assembling steps increase, thereby increasing costs and increasing the arm weight. Does not cause any adverse effects.

According to the second aspect of the present invention, since the end plate of the pad carrier doubles as the retaining bracket of the rope terminal,
The number of parts can be reduced, and space and weight can be reduced.

According to the third aspect of the present invention, since the tension acting on the rope can be shared by the distal end surface of the tubular body, the load on the pad carrier end plate can be reduced, and the end plate can be reduced in size and thickness. can do.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

In this embodiment, the arm 5 of the deep hole excavator shown in FIG.
Rope 1 constituting the rope-type reduction mechanism 15 shown in FIG.
A description will be given of an example in which the rope end 19a of the ninth is fixed to the distal end of the first arm body 10.

As in the conventional case, the second arm 11 is provided on both sides of the distal end of the first arm 10 in the arm width (left / right) direction.
Are slidably supported via pad carriers 28 and 29, respectively.

Of the two pad carriers 28 and 29,
The pad carrier 29 on the same side as the side where the rope guide sheave 18 shown in FIG. 5 is provided (lower side in FIG. 1, right side in FIG. 2).
In a portion corresponding to the back side of the pad 27, a rope through hole 30 is provided so as to penetrate in the arm body length direction.

A carrier end plate 31 is provided at the front end of the pad carrier 29 so as to extend outside the front end of the first arm body 10 and abut against the front end surface of the arm body 10 from the front (see FIG. 3). ing.

Rope end 19a of reduction rope 19
Is passed through the rope through hole 30 of the pad carrier 29 in a state of penetrating the hole 30 and the carrier end plate 31,
This penetrating end (screw portion) is fixed to the carrier end plate 31 via a spherical washer 32 with a nut 33.

As described above, the rope end 19a is passed through the pad carrier 29 (within the space occupied by the pad carrier 29) and is fixed to the distal end of the arm body, so that the following operation and effect can be obtained. it can.

It is not necessary to secure a space dedicated to fixing the rope end in the narrow arm body 10.

Accordingly, since the space dedicated to fixing the rope end can be omitted, the space in the arm body 10 can be extra. Therefore, the rope 19 and other built-in arm bodies, particularly the rope 19 are arranged close to the rope 19. Oil hose 2
4 can be provided with a sufficient gap to prevent such interference.

Since the reduction rope 19 can be arranged in the arm body 10 on the same side as the rope guide sheave 18 shown in FIG. 5 (one side in the arm width direction),
Rope 1 between the sheave 18 and the rope end 19a
The fleet angle of the rope 9 can be made smaller than that of the related art, and the load on the rope 19 can be reduced, and the life of the rope 19 can be improved.

Since the pad carrier 29 can also be used as a rope guard, compared with a case where a dedicated rope guard such as a pipe for preventing interference is added as in the related art,
The number of parts and the number of assembling steps are reduced, and the cost and weight can be reduced.

Since the end plate 31 of the pad carrier 29 also serves as a bracket for fixing the rope end, the number of parts, the number of parts, the space, and the weight can be reduced by the amount of the dedicated bracket.

The tension acting on the reduction rope 19 is applied to the pad carrier 29 via the carrier end plate 31 and is also applied to the tip end surface of the first arm body 10 with which the carrier end plate 31 abuts. This makes it possible to reduce the rope tension load on the pad carrier 29, and to reduce the size and thickness of the pad carrier 29 including the carrier end plate 31.

The present invention is not limited to the above-described arm of a deep hole excavator, but also includes a telescopic arm of a construction machine having a rope type telescopic mechanism including a crane boom and having a pad with a pad carrier. Can be widely applied to.

[0047]

As described above, according to the present invention, the rope terminal is passed through the rope through hole provided in the pad carrier and is fixed to the tip of the arm body in the space occupied by the pad carrier. In addition, the space between the rope and other objects (especially, an oil hose disposed close to each other) can be prevented by widely using the space in the cylinder.

Further, since the rope can be arranged on the same side as the rope guide sheave in the width direction of the cylinder, the fleet angle of the rope is reduced as compared with the conventional one, and the load on the rope is reduced. The life can be improved.

Further, since the pad carrier can also be used as a rope guard, and there is no need to add a dedicated rope guard such as a pipe for preventing interference, the number of parts and the number of assembling steps increase, the cost increases, the arm weight increases, and the like. Does not cause any adverse effects.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first arm body and a rope and the like provided in a first arm body constituting an arm of a deep hole excavator according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is a schematic side view of a deep hole excavator.

FIG. 5 is a schematic sectional view of an arm as a telescopic arm used in the excavator.

FIG. 6 is a view corresponding to FIG. 1 of an arm body showing a conventional technique.

FIG. 7 is a front view of the arm body.

[Explanation of symbols]

 Reference Signs List 5 Arm as telescopic arm 10 First arm body as cylindrical body constituting arm 11 Same second arm body 12 Same third arm body 13 Telescopic cylinder 15 Rope type reduction mechanism 19 Reduction rope 19a Terminal for reduction rope 27a Pad 29 Pad carrier 30 Rope through hole 31 Carrier end plate

Continued on the front page (72) Eiji Shinkotani 3-12-4 Gion, Asaminami-ku, Hiroshima City Kobelco Construction Machinery Co., Ltd. Hiroshima Head Office (72) Inventor Takayuki Oknishi 3-Gion, Asaminami-ku, Hiroshima City 12-4 Kobelco Construction Machinery Co., Ltd. Hiroshima Head Office F-term (reference) 3F205 AA05 AC01 BA01 CA03 CB05 KA02 KA10

Claims (3)

[Claims] 1. An inner surface of a distal end portion of an outer cylindrical body of two adjacent cylindrical bodies, wherein a plurality of cylindrical bodies are adjacently slidably fitted to each other so as to be telescopically expandable and contractible. A pad for slidably supporting the inner cylinder is attached via a pad carrier, and the extension or contraction force of the specific cylinder by the telescopic cylinder is folded between the cylinders via the folding guide member. In a telescopic arm of a construction machine configured to transmit to another cylinder by a bridged rope and extend or reduce the other cylinder at the same time, in the pad carrier, a cylinder of the pad carrier to which a terminal of the rope is fixed. In a pad carrier provided at the tip of the body, a rope through hole is provided so as to penetrate in the longitudinal direction of the tubular body, and the rope end is passed through the rope through hole and stopped at the tubular body tip. A telescopic arm of a construction machine characterized by being attached. 2. A pad carrier provided with a rope through-hole, a carrier end plate is provided at an end portion on a tip end side of the cylindrical body, and a rope terminal passed through the rope through-hole is fixed to the carrier end plate in a penetrating state. The telescopic arm of a construction machine according to claim 1, wherein the telescopic arm is provided. 3. The telescopic arm of a construction machine according to claim 2, wherein the end plate of the pad carrier is provided so as to abut on a distal end surface of the cylinder provided with the pad carrier.