JPH0646047U - Rope type telescopic arm for construction machinery - Google Patents

Abstract

(57) [Summary] [Purpose] If the main rope of the rope expansion and contraction arm of construction machinery should break, prevent the arm and bucket from falling and ensure work safety, and also replace the main rope. Make the repair work easier. [Structure] One end of an auxiliary rope 33 is fixed to a base end arm 21 and wound around a movable sheave 26 and a fixed sheave 24 in order. The other end of the auxiliary rope 33 is locked to the intermediate arm 22 to support the intermediate arm 22, and the upper support rope 35 supports the tip arm 23.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a telescopic arm for a construction machine, and more particularly to a rope type telescopic arm that extends or retracts a main rope wound around multiple sheaves to extend and retract the arm.

[0002]

[Prior art]

 A conventional rope type telescopic arm of this type of construction machine is shown in FIG. The intermediate arm 2 and the tip arm 3 are inserted in the base end arm 1 attached to the construction machine, and a fixed sheave 4 for hoisting and a fixed sheave 5 for lowering are paired on the outer surface of the base end arm 1. The movable sheaves 6 and 7 are provided between the fixed sheaves 4 and 5, and the movable sheaves 6 and 7 are movable via a hydraulic cylinder 8.

Then, one end 9 a of the main rope 9 is fixed to the upper part of the outer peripheral surface of the base end arm 1, and the main rope 9 is wound between the movable sheave 6 and the fixed sheave 4, and the upper end of the base end arm 1 is fixed. The other end 9b of the main rope 9 is locked to the upper part of the tip arm 3 via the top sheave 10 provided on the. Further, one end 11a of the hoisting rope 11 is fixed to the lower part of the outer peripheral surface of the base end arm 1, and the hoisting rope 11 is wound between the movable sheave 7 and the fixed sheave 5, and provided on the lower part of the base end arm 1. The other end 11b of the hoisting rope 11 is locked to the upper part of the intermediate arm 2 via the bottom sheave 12. Further, a fixed sheave 13 is provided below 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 connected to the lower portion of the proximal arm 1 and the upper portion of the distal arm 3. Lock.

When the hydraulic cylinder 8 is contracted, the distance between the fixed sheave 4 and the movable sheave 6 is shortened, the main rope 9 is paid out from the top sheave 10, and the fixed sheave 5 and the movable sheave 7 are separated. Is extended and the lowering rope 11 is wound from the bottom sheave 12. Therefore, as shown in FIG. 5, the intermediate arm 2 and the front end arm 3 are extended from the base end arm 1, and the entire arm is in an extended state, 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 the above, and the lowering rope 11 is paid out to contract the entire arm.

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

[0006]

[Problems to be solved by the device]

 As described above, in the conventional rope type telescopic arm, the tip arm 3 can obtain a movement amount several times as large as the stroke of the hydraulic cylinder 8. However, if the main rope 9 were to break, the control of the intermediate arm 2 and the tip arm 3 would be lost and the equal arms 2, 3 and the bucket 15 would fall, which is extremely dangerous in terms of work safety. Further, when converting the main rope 9, a lifting device such as a crane is required to lift the bucket 15 and store the intermediate arm 2 and the distal arm 3 in the proximal arm 1, which is a great repair work. Labor and time are spent, which adversely affects the work process.

Therefore, if the main rope of the rope type telescopic arm is broken, the intermediate arm and the tip arm are prevented from dropping to ensure the safety of the work, and the repair work of the main rope replacement is performed. Therefore, the present invention aims to solve this problem because a technical problem to be solved will arise.

[0008]

[Means for Solving the Problems]

 The present invention has been proposed to achieve the above-mentioned object, and is composed of a base arm mounted on a construction machine, and an intermediate arm and a tip arm inserted in the base arm. A pair of fixed sheaves is provided on the outer peripheral surface, a movable sheave movable by moving means is arranged between the fixed sheaves, the main rope is wound between the equal sheaves, and one end of the main rope is connected to the base arm. In the rope type telescopic arm in which the other end of the main rope is locked to the tip arm, one end of the auxiliary rope is fixed to the outer peripheral surface of the base end arm, and the auxiliary rope is attached between the moving sheave and the fixed sheave. The upper end of the intermediate arm with fixed sheaves, and the upper support rope is wound around the fixed sheaves at the upper part of the intermediate arm. Top and base end A rope-type telescopic arm for construction machinery, which is locked to the lower part of the intermediate arm and the lower support rope is wound around the fixed sheave on the lower part of the intermediate arm, and both ends of which are locked to the upper part of the distal arm and the lower part of the proximal arm. To do.

[0009]

[Action]

 When the movable sheave moves by the moving means, the main rope is wound or unwound and the tip arm and the intermediate arm move up and down. As the main rope is hoisted and lowered, the auxiliary rope is hoisted and lowered, and the movement of the auxiliary rope follows the vertical movement of the intermediate arm. The upper support rope and the lower support rope with both ends locked to the upper part of the distal arm and the lower part of the proximal arm are symmetrical between the upper and lower fixed sheaves as the distal arm and the intermediate arm move up and down. Moving.

If the main rope should break, the auxiliary rope supports the intermediate arm and the upper support rope supports the tip arm to prevent the intermediate arm and the tip arm from falling.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described 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, in which a middle arm 22 and a tip arm 23 are inserted in a base end 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 a pair on the outer peripheral surface of the base arm 21. Movable sheaves 26, 27 are arranged between the fixed sheaves 24, 25, and a movable cylinder 26, 27 is made movable by interposing a hydraulic cylinder 28 as a moving means.

Then, one end 29 a of the main rope 29 is fixed to the upper part of the outer peripheral surface of the base end arm 21, and between the four movable sheaves 26, 26, 26, 26 and the fixed sheaves 24, 24, 24, 24. The main rope 29 is sequentially wound from one side, and the other end 29b of the main rope 29 is locked to the upper end of the distal arm 23 via a top sheave 30 provided on the upper end of the proximal end arm 21. Further, one end 31a of the hoisting rope 31 is fixed to the lower part of the outer peripheral surface of the base end arm 21, and the hoisting rope 31 is sequentially wound between the two movable sheaves 27, 27 and the fixed sheaves 25, 25. The other end 31b of the hoisting rope 31 is locked to the upper portion of the intermediate arm 22 via the bottom sheave 32 provided at the lower portion of the base end arm 21.

Next, one end 33 a of the auxiliary rope 33 is fixed to the upper part of the outer peripheral surface of the base end arm 21, and the auxiliary rope 33 is wound between the two fixed sheaves 24, 24 and the movable sheaves 26, 26 in sequence. The other end 33b of the auxiliary rope 33 is locked to the upper part of the intermediate arm 22 through the top sheave 30 provided on the upper part of the base end arm 21. A fixed sheave 34 is provided above the intermediate arm 22, an upper support rope 35 is wound around the fixed sheave 34, one end 35a of the upper support rope 35 is locked to the lower portion of the proximal arm 21, and the other end 35b thereof is attached to the distal arm 23. Lock to the top of. Further, a fixed sheave 36 is provided below the intermediate arm 22, a lower support rope 37 is wound around the fixed sheave 36, one end 37a of the fixed support sheave 36 is locked to the lower portion of the base arm 21, and the other end 37b is provided at the tip. Lock on top of 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 distance between the fixed sheave 24 and the movable sheave 26 is shortened and the main rope 29 is paid out from the top sheave 30. The distance between the fixed sheave 25 and the movable sheave 27 is extended, and the hoisting rope 31 is wound from the bottom sheave 32. Therefore, the intermediate arm 22 and the tip arm 23 are extended from the base end arm 21, the entire arm is in an extended state, and the bucket 35 descends. In this embodiment, a pair of four fixed sheaves 24, 24, 24, 24 and movable sheaves 26, 26, 26, 26, and two fixed sheaves 25, 25 and movable sheaves 27, 27 are combined. Therefore, the unwinding amount of the lowering rope 31 doubles the unwinding amount of the main rope 29, and the tip arm 23 descends with double the moving amount of the intermediate arm 22.

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

If the hydraulic cylinder 28 is extended after the work such as excavation by the bucket 38 or holding of earth and sand, the main rope 29 is wound by the operation opposite to the above, and the lowering rope 31 is unwound to contract the entire arm. I will do it. At that time, the auxiliary rope 33 is wound as the intermediate arm 22 rises, 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 breaks while the tip arm 23 moves up and down, the auxiliary rope 33 supports the intermediate arm 22 and the upper support rope 35 moves. Supports the tip arm 23. Thus, even if 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 breaks, 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 As 22 is pulled up, 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 retracted without using a lifting device such as a crane, and the main rope 29 can be easily replaced.

The number of combinations of the fixed sheave 24 and the movable sheave 26, and the combination of the fixed sheave 25 and the movable sheave 27 should not be limited to the one embodiment. Further, 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]

[Effect of device]

 As described in detail in the above embodiment, the present invention locks the auxiliary rope extended from the proximal arm to the intermediate arm, and the distal arm uses the upper support rope and the lower support rope to connect the intermediate arm and the proximal arm. Is locked to. Therefore, if the main rope should break, the auxiliary rope supports the intermediate arm and the upper support rope supports the tip arm, so that the fall of the intermediate arm and the tip arm can be prevented.

[0021] Thus, each arm of the rope-type telescopic arm and the bucket can be prevented from falling, which can contribute to the improvement of work safety. In addition, in the repair work after the main rope is broken, each arm can be contracted by itself, which is a practical idea of various kinds such that the repair work can be performed easily and quickly.

[Brief description of 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 vertical sectional front view showing an operating state of the rope type telescopic arm.

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

FIG. 5 is a vertical cross-sectional front view showing an operating state of a conventional rope type telescopic arm.

[Explanation of symbols]

 21 Base Arm 22 Intermediate Arm 23 Tip 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)

[Scope of utility model registration request] 1. A base end arm mounted on a construction machine, an intermediate arm and a tip arm inserted in the base end arm, and a pair of fixed sheaves is provided on the outer peripheral surface of the base end arm. A movable sheave that can be moved by moving means is arranged between the sheaves, and the main rope is wound between the equal sheaves to fix one end of the main rope to the proximal arm and the other end of the main rope to the distal arm. With the rope type telescopic arm locked, one end of the auxiliary rope is fixed to the outer peripheral surface of the base end arm,
An auxiliary rope is wound between the movable sheave and the fixed sheave, and the other end is locked to the intermediate arm, fixed sheaves are provided on the upper and lower portions of the intermediate arm, and an upper support rope is provided on the fixed sheave on the upper portion of the intermediate arm. It is wound, and both ends are locked to the upper part of the tip arm and the lower part of the base arm,
A rope type telescopic arm for a construction machine, wherein a lower support rope is wound around a fixed sheave at a lower portion of an intermediate arm, and both ends thereof are locked to an upper portion of a tip arm and a lower portion of a base end arm.