JP2559756Y2 - Rope type telescopic arm of construction equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic arm of a construction machine, and more particularly to a rope type telescopic arm for extending or retracting a main rope wound around multiple sheaves to extend and retract the arm.

[0002]

2. Description of the Related Art A conventional rope-type telescopic arm of this type of construction machine is shown in FIG. An intermediate arm 2 and a distal arm 3 are inserted into a base arm 1 mounted on a construction machine. A fixed sheave 4 for hoisting and a fixed sheave 5 for lowering are paired on the outer surface of the base arm 1. Fixed sheaves 4 and 5
The movable sheaves 6, 7 are arranged between them, and the movable sheaves 6, 7 can be moved by interposing a hydraulic cylinder 8.

[0003] One end 9a of the main rope 9 is fixed to the upper part of the outer peripheral surface of the base arm 1, and the main rope 9 is wound between the movable sheave 6 and the fixed sheave 4, and is provided above the base arm 1. The other end 9b of the main rope 9 via the top sheave 10
To the upper part of the distal arm 3. In addition, lowering rope 1
1 is fixed to the lower part of the outer peripheral surface of the base arm 1 at one end 11a,
Lowering rope 11 between movable sheave 7 and fixed sheave 5
And a bottom sheave 1 provided under the base arm 1.
2, the other end 11 b of the lowering rope 11 is locked to the upper part of the intermediate arm 2. Further, a fixed sheave 13 is provided at a lower portion of the intermediate arm 2, and a lower support rope 14 is wound around the fixed sheave 13, and both ends of the lower support rope 14 are locked to a lower portion of the base arm 1 and an upper portion of the distal arm 3. I do.

When the hydraulic cylinder 8 is contracted, the distance between the fixed sheave 4 and the movable sheave 6 is reduced, the main rope 9 is fed out from the top sheave 10, and the fixed sheave 5 and the movable sheave 7 The distance is extended, and the lowering rope 11 is wound from the bottom sheave 12. Accordingly, as shown in FIG. 5, the intermediate arm 2 and the distal arm 3 are extended from the proximal arm 1, and the entire arm is extended, and the bucket 15 descends. If the hydraulic cylinder 8 is extended after work such as excavation by the bucket 15 or holding of earth and sand, the main rope 9 is wound by the operation opposite to that described above, and the lowering rope 11 is extended to contract the entire arm.

The amount of vertical movement of the distal arm 3 when the entire arm extends or contracts is several times the stroke of the hydraulic cylinder 8. For example, a pair of fixed sheaves 4 and a movable sheave 6, and a series of fixed sheaves 5 In combination with the movable sheave 7, the tip arm 3 moves up and down by a moving amount twice as large as that of the intermediate arm 2.

[0006]

In the conventional rope-type telescopic arm, the tip arm 3 can obtain a moving amount several times as large as the stroke of the hydraulic cylinder 8 as described above. However, if the main rope 9 is broken, the control of the intermediate arm 2 and the tip arm 3 is lost,
3 and the bucket 15 fall, which is extremely dangerous for work safety. When the main rope 9 is converted, the bucket 15 is lifted and the intermediate arm 2 and the distal arm 3 are moved to the proximal arm 1.
A hoisting device such as a crane is required to store the device inside, and a great deal of labor and time is required for repair work, which adversely affects the work process.

In the event that the main rope of the rope-type telescopic arm breaks, the intermediate arm and the tip arm are prevented from dropping to ensure the safety of the operation, and the repair work for replacing the main rope is facilitated. Therefore, a technical problem to be solved arises, and the present invention aims to solve this problem.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and comprises a base arm mounted on a construction machine, and an intermediate arm and a distal arm inserted into the base arm. A pair of fixed sheaves is provided on the outer peripheral surface of the base arm, and a movable sheave movable by a moving means is disposed between the fixed sheaves, and a main rope is wound between the sheaves. In a rope-type telescopic arm having one end of a rope fixed to a base arm and the other end of a main rope fixed to a distal arm, one end of an auxiliary rope is fixed to an outer peripheral surface of the base arm, Auxiliary rope is wound between the fixed sheave and the other end is locked to the intermediate arm, fixed sheaves are provided at the upper and lower portions of the intermediate arm, and the upper support rope is wound around the fixed sheave at the upper part of the intermediate arm, Tip both ends Construction equipment that is locked to the upper part of the arm and to the lower part of the base arm, the lower support rope is wound around the fixed sheave below the intermediate arm, and both ends are locked to the upper part of the distal arm and the lower part of the base arm. The present invention provides a rope-type telescopic arm.

[0009]

When the movable sheave is moved by the moving means, the main rope is wound or pulled out, and the tip arm and the intermediate arm move up and down. The auxiliary rope is hoisted down with the main rope being hoisted down, and the movement of the auxiliary rope follows the vertical movement of the intermediate arm. The upper and lower support ropes with both ends locked to the upper part of the distal arm and the lower part of the proximal arm move symmetrically between the upper and lower fixed sheaves as the distal and intermediate arms move up and down. I do.

If the main rope breaks, the auxiliary rope supports the intermediate arm and the upper support rope supports the distal arm, thereby preventing the intermediate arm and the distal arm from falling.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of explanation, the same components as those of the related art will be described at the same time. 1 and 2 show a rope-type telescopic arm of a construction machine. An intermediate arm 22 and a distal arm 23 are inserted into a base arm 21 attached to a boom (not shown) of the construction machine. A fixed sheave 24 for winding and a fixed sheave 25 for lowering are provided in pairs on the outer peripheral surface of the base arm 21. The movable sheaves 26 and 27 are disposed between the fixed sheaves 24 and 25, and the movable sheave 2 is
6, 27 are movable.

Then, one end 29a of the main rope 29 is fixed to the upper part of the outer peripheral surface of the base arm 21, and the four movable sheaves 2 are fixed.
6, 26, 26, 26 and fixed sheaves 24, 24, 24,
The other end 29b of the main rope 29 is locked to the upper part of the distal arm 23 via the top sheave 30 provided on the upper part of the proximal end arm 21. Further, one end 31a of the lowering rope 31 is fixed to the lower part of the outer peripheral surface of the base end arm 21, and the two movable sheaves 27, 2
The lower rope 31 is sequentially wound between the fixed arm 7 and the fixed sheaves 25, 25, and the other end 31 b of the lower rope 31 is engaged with the upper part of the intermediate arm 22 via the bottom sheave 32 provided below the base arm 21. Stop.

Next, one end 33a of the auxiliary rope 33 is fixed to the upper part of the outer peripheral surface of the base arm 21, and the two fixed sheaves 2 are fixed.
The auxiliary rope 33 is sequentially wound between the movable sheaves 4, 24 and the movable sheaves 26, 26, and the other end 33 b of the auxiliary rope 33 is connected to the upper part of the intermediate arm 22 through the top sheave 30 provided on the upper part of the base arm 21. To lock. And the middle arm 2
2, a fixed sheave 34 is provided on the upper part of the fixed sheave 34.
The upper end of the upper support rope 35 is wound around the lower end of the base arm 21 and the other end 35b is locked.
To the upper part of the tip arm 23. Further, a fixed sheave 36 is provided below the intermediate arm 22, and the fixed sheave 36
The lower end of the lower support rope 37 is wound around the lower end of the base arm 21 and the other end 37b.
To the upper part of the tip arm 23. A bucket 38 is attached to the lower end of the tip arm 23.

1 and 2, when the hydraulic cylinder 28 is contracted, the fixed sheave 24 and the movable sheave 2
6 and the main rope 29 becomes the top sheave 30
And the distance between the fixed sheave 25 and the movable sheave 27 is extended, and the lowering rope 31 is wound from the bottom sheave 32. Accordingly, the intermediate arm 22 and the distal arm 23 are extended from the base arm 21, the entire arm is extended, and the bucket 35 descends. In this embodiment, a pair of four fixed sheaves 24, 24, 2
4, 24 and the movable sheaves 26, 26, 26, 26 and the two fixed sheaves 25, 25 and the movable sheaves 27, 27 are combined. Is doubled, and the distal arm 23 descends by twice the amount of movement of the intermediate arm 22.

As shown in FIG. 3, the auxiliary rope 33 is pulled out from the top sheave 30 as the intermediate arm 22 is lowered. As described above, the upper support rope 3 is moved down to the distal arm 23 by twice the moving amount of the intermediate arm 22.
5 moves the fixed sheave 34 above the intermediate arm 22 in the direction of the arrow X, and the lower support rope 37 moves the fixed sheave 36 below the intermediate arm 22 in the direction of the arrow Y. Then, the upper support rope 35 and the lower support rope 37 move according to the ratio of the descending distance of the intermediate arm 22 and the descending distance of the distal arm 23, and the entire arm smoothly extends.

If the hydraulic cylinder 28 is extended after work such as excavation by the bucket 38 or holding of earth and sand, the main rope 29 is wound by the operation reverse to the above, and the lowering rope 31 is extended to contract the entire arm. I will do it. At that time, the auxiliary rope 33 is entangled with the rise of the intermediate arm 22, and the upper support rope 35 and the lower support rope 37 move in the opposite direction to the above.

If the main rope 29 is broken while the tip arm 23 is moving up and down, the auxiliary rope 33 supports the intermediate arm 22 and the upper support rope 35 Support 23. Thus, even when the main rope 29 is broken, the tip arm 23, the bucket 38, and the intermediate arm 22 can be prevented from falling.

When replacing the main rope 29 after the main rope 29 is broken, the auxiliary rope 33 is wound around the fixed sheave 24 and the movable sheave 26 by extending the hydraulic cylinder 28, and the intermediate arm 22 is moved. As it is raised, the tip arm 23 supported by the upper support rope 35 and the lower support rope 37 also rises integrally with the intermediate arm 22. Therefore, the arm can be contracted without using a lifting device such as a crane, and the replacement work of the main rope 29 can be easily performed.

The number of combinations of the fixed sheave 24 and the movable sheave 26 and the number of the fixed sheave 25 and the movable sheave 27 should not be limited to the above embodiment. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0020]

According to the present invention, as described in detail in the above embodiment, the auxiliary rope extended from the base arm is locked to the intermediate arm, and the distal arm is connected to the intermediate arm by the upper support rope and the lower support rope. Locked to the end arm.
Therefore, if the main rope should break, the auxiliary rope supports the intermediate arm and the upper support rope supports the distal arm, so that the intermediate arm and the distal arm can be prevented from falling.

Thus, the fall of each arm and the bucket of the rope-type telescopic arm can be avoided, which contributes to the improvement of work safety. In the repair work after the main rope breaks,
This is a practically valuable inventor that can contract each arm by itself and can easily and quickly perform a repair operation.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a rope-type telescopic arm of a construction machine according to the present invention.

FIG. 2 is a side view of a main part of a fixed sheave and a movable sheave.

FIG. 3 is a longitudinal sectional front view showing an operation state of a rope-type telescopic arm.

FIG. 4 is a longitudinal sectional front view of a conventional rope-type telescopic arm.

FIG. 5 is a longitudinal sectional front view showing an operation state of a conventional rope-type telescopic arm.

[Explanation of symbols]

 21 Base End Arm 22 Intermediate Arm 23 End Arm 24,25 Fixed Sheave 26,27 Movable Sheave 28 Hydraulic Cylinder 29 Main Rope 33 Auxiliary Rope 34,36 Fixed Sheave 35 Upper Support Rope 37 Lower Support Rope

Claims (1)

(57) [Scope of request for utility model registration] 1. A fixed sheave comprising a base arm mounted on a construction machine, an intermediate arm and a distal arm inserted into the base arm, and a pair of fixed sheaves provided on an outer peripheral surface of the base arm. A movable sheave movable by a moving means is provided between the sheaves, and a main rope is wound between the sheaves and one end of the main rope is fixed to the base arm, and the other end of the main rope is connected to the tip arm. In the locked rope type telescopic arm, one end of the auxiliary rope is fixed to the outer peripheral surface of the base arm,
An auxiliary rope is wound between the moving sheave and the fixed sheave, and the other end is locked to the intermediate arm.Fixed sheaves are provided at the upper and lower portions of the intermediate arm, and an upper support rope is provided at the fixed sheave at the upper portion of the intermediate arm. While winding, both ends are locked to the upper part of the distal arm and the lower part of the proximal arm,
A rope-type telescopic arm for a construction machine, wherein a lower support rope is wound around a fixed sheave below an intermediate arm, and both ends of the lower support rope are engaged with an upper portion of a distal arm and a lower portion of a proximal arm.