JPH03281831A - Multistage expandible arm for construction machine - Google Patents

Abstract

PURPOSE:To increase the force of pressing during an excavation period by a method in which a fixing sheave is provided to both ends of the periphery of the basal end arm, a movable sheave is provided to the middle, the basal end is connected with the intermediate arm by a pressing rope, and the basal end is connected with the tip arm by a tuning rope. CONSTITUTION:Fixing sheaves 7 and 8 are provided to the peripheral both ends of a basal end arm 1 consisting of 3-stages or more expandible arms, and a movable sheave 9 is provided between the sheaves 7 and 8. A fixing sheave 16 is also provided to the tip of the intermediate arm 2. The rear end of the arm 2 is connected with the sheave 9 through the sheave 8 by a pressing rope 14, and the movable sheave 9 is connected to a winding drum 10 through the sheave 7 by a rope 13. The tip of the arm 1 is connected with the rear end of the tip arm 3 through the sheave 16 by a tuning rope 15. The pressing force of the arm 3 can thus be obtained by winding the drum 10.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention includes a boom that can be raised and lowered at the front of an upper revolving body of a hydraulic excavator, etc., and an arm having a packet for performing underground excavation is attached to the boom. The present invention relates to the structure of a multi-stage telescopic arm of an excavator.

(Prior art) This type of multi-stage telescopic arm excavator was developed primarily for foundation work for the construction of power transmission towers, and was originally designed to excavate using the self-weight of the telescopic arm and packet as shown in Figure 7. In other words, multi-stage telescoping arms that cannot exert any pressing force other than their own weight have been the mainstream.

However, when excavating using only the self-weight of the telescopic arm or packet, the amount of penetration changes due to changes in soil quality, and the amount of grip changes, resulting in uneven work and problems such as an extreme reduction in the amount of excavation when the excavated ground is hard. was there.

To solve this problem, the telescoping arm shown in Fig. 8 was developed which applies a pressing force to the multi-stage telescoping arm. However, since a hydraulic cylinder is used as a means of moving the arm to extend and retract, it is necessary to use the hydraulic cylinder to increase the excavation depth. It was necessary to increase the stroke, and a small increase in stroke did not provide the required digging depth.

Therefore, by increasing the number of telescopic stages of the multi-stage telescoping arm, the excavation depth can be increased without increasing the stroke of the hydraulic cylinder too much. It is also necessary to increase the number of ropes that are strung between the movable sheaves, and although the expansion and contraction speed of the multi-stage telescoping arm becomes faster as the number of ropes is increased, there is a problem in that the winding force and pressing force become weaker.

In underground excavation, especially deep excavation, where excavated earth and sand must be frequently transported to the surface, increasing the expansion and contraction speed of the multi-stage telescopic arm will improve work efficiency, but the pressing force will not decrease. In hard excavated ground, it becomes impossible to excavate, which can be fatal.

(Problem to be solved by invention) The present invention has been made in view of the above facts.

The purpose is to provide a multi-stage telescopic arm capable of excavating at a predetermined expansion/contraction speed and sufficient pressing force, and capable of excavating at great depths and pressing.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, fixed sheaves are provided above and below the proximal arm, a movable sheave is arranged between the fixed sheaves, and a rope is wound around the proximal arm. A driving means with a take-up drum attached to the shaft is attached, and the other end of the pull-in rope, which has one end locked to the rope take-up drum, is connected to the movable arm. On the other hand, one press with one end locked on the rope winding drum wraps the other end of the rope between the fixed sheave and the movable sheave, and the other press with one end locked on the movable sheave side wraps the other end of the rope. It is latched to the movable arm via the lower fixed sheave for the proximal arm or the fixed sheaves provided on the upper and lower parts of the intermediate arm, and in combination with the synchronized rope provided between each arm, enables pressing excavation.

(Example) Examples of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, the multi-stage telescopic arm is composed of a proximal arm 1, one or more intermediate arms 2 (2a, 2b, 2c...), a distal arm 3, etc.; The case where there is one will be explained below. The above revolving body 4
A boom 5 is attached to the front of the boom 5, and a proximal arm 1 is attached to the boom 5.
are pivotally mounted to be able to move up and down, respectively, and an arm cylinder 6 is attached between the base end arm 1 and the boom 5.

The proximal arm 1, the intermediate arm 2, and the distal arm 3 are inserted and fitted in a telescopic manner, and an upper fixed sheave 7 for the proximal arm is attached to the upper part of the outer peripheral surface of the proximal arm 1. At the bottom of the lower fixed sheave 8 for the proximal arm.
is installed.

A movable sheave 9 is disposed between the upper fixed sheave 7 for the proximal arm and the lower fixed sheave 8 for the proximal arm, and a driving means 11 having a rope winding drum 10 pivoted on the upper part of the proximal arm 1 is provided. One end of a pull-in rope 12 is locked to the rope winding drum 10, and the pull-in rope 12
The other end is connected to the tip arm 3.

One end of the rope 13 is locked to the rope winding drum 10, and the other end of the rope 13 is passed between the upper fixed sheave 7 for the proximal arm and the movable sheave 9, and then It is locked on the fixed sheave 7 (or base end arm 1) to movable sheave 9 side. In addition, one end of another pressing rope 14 is locked on the movable sheave 9 side;
The other end of 4 is connected to the upper part of the intermediate arm 2 via a lower fixed sheave 8 for the proximal arm.

Further, one end of a tuning rope 15 that synchronizes the expansion and contraction of the proximal arm 1, intermediate arm 2, and distal arm 3 is attached to the lower end of the proximal arm 1, and the other end of the tuning rope 15 is connected via a fixed sheave 16 for tuning. It is connected to the upper part of the tip arm 3.

FIG. 4 is a modification of FIG. 2 in which an upper fixed sheave 17 for the tip arm is provided on the top of the tip arm 3, and the rope winding drum 1o is
The other end of the pull-in rope 12, which has one end locked to, is locked to the base end arm 1 via an upper fixed sheave 17 for the front arm.

Figure 5 is a modification of Figure 4, in which one end of the rope 14 is locked to the movable sheave 9 and the other end of the rope 14 is the lower fixed sheave 8 for the proximal arm and the intermediate arm provided above and below the intermediate arm. After being sequentially wrapped around the upper fixed sheave 18 and the lower fixed sheave 19 for intermediate arm, it is connected to the upper part of the tip arm 3.

Note that the pressing rope 13 and the retracting rope 12 are connected between the upper fixed sheave 7 and the movable sheave 9 for the proximal arm.
The ratio of the number of turns to the number of turns is determined by taking into consideration the number of extension stages of the telescopic arm itself and the position of the pulling rope 12.

In addition, in the above explanation, the pulling rope 12 and the pressing rope 1 are
Although the explanation has been made as separate ropes with the rope winding drum 10 as the source of the rope winding drum 10, the pulling rope 12 and the pushing rope 13 are one continuous rope, and the rope winding drum 10
The rope, which has been wound multiple times, may be fixed with a clamp 20 at an appropriate position on the rope winding drum 10 (Fig. 6).
.

Next, the operation of this embodiment will be explained.

(1) When retracting (retracting) the multi-stage telescopic arm; when the drive means 11 is rotated to the arm retracting side (rotation to the left in FIG. 2) and the retracting rope 12 is wound around the rope winding drum 10, the tip arm 3 is contracted, and at the same time, the tuning rope 15 is also pulled, and the intermediate arm 2 is also trying to contract.

On the other hand, by driving the driving means 11, the pressing rope 13 is unwound from the rope winding drum 10, the other pressing rope 14 is pulled by the contraction of the intermediate arm 2, the movable sheave 9 moves downward, and the The telescoping arm as a whole is balanced and retracts.

(2) When extending the multi-stage telescopic arm; driving means 11
is rotated to the arm extrusion side (clockwise rotation in Fig. 2), and when the pressing winds the rope 13 onto the rope winding drum 10, the movable sheave 9 moves upward, and the other pressing pulls the rope 14, and the intermediate Arm 2 extends.

On the other hand, the retraction rope 12 is unwound from the rope winding drum 10 by driving the driving means 11, and the extension of the intermediate arm 2 causes the tip arm 3 to extend via the synchronized rope 15, and in this case as well, the entire multistage telescopic arm is balanced. and expand.

Although the case where there is one intermediate arm has been described above, it goes without saying that it is also possible to use two or more intermediate arms.

(Effects) With the above configuration, if sufficient capacity of the rope winding drum is ensured, deep excavation and pressing are possible, and it is possible to perform deep excavation and pressing between the fixed sheave and the movable sheave as in the conventional example. Unlike methods that increase the depth of excavation by increasing the number of ropes being turned, sufficient pressing force can be generated without significantly changing the speed of expansion and contraction, resulting in a decrease in gripping amount even in hard excavated ground. Since the work can be carried out without any trouble, it has a remarkable effect in terms of workability.

[Brief explanation of drawings]

FIG. 1 is an overall view of a hydraulic excavator equipped with a multi-stage telescopic arm according to the present invention. FIG. 2 is a side cross-sectional view of the multi-stage telescopic arm according to the present invention. Figure 3 is a front external view of the same. FIGS. 4 to 6 are views showing other embodiments of the multi-stage telescopic arm according to the present invention. FIG. 7 to FIG. 8 are diagrams showing conventional examples. In the figure: 1 base arm 2 intermediate arm 3 tip arm 4 revolving body 5 boom 6 arm cylinder 7 (for base arm) upper fixed sheave 8 (for base arm) lower fixed sheave 9 movable sheave 10 rope winding drum 11
Drive means 12 Pulling rope 13 Pressing is a rope 14 Pressing is a rope 15 Tuning rope 16 (for tuning) Fixed sheave 17 (for tip arm) Upper fixed sheave 18 (for intermediate arm) Upper fixed sheave 19 (for intermediate arm) Lower fixed sheave 20 Clamp diagram Figure 2 Figure 7 Figure 6 Figure 8EJ

Claims (4)

[Claims] (1) In a multi-stage telescoping arm that is constructed of a proximal arm attached to a construction machine such as a hydraulic excavator, one or more intermediate arms, a distal arm, etc., and that extends and contracts via a rope, the outer peripheral surface of the proximal arm An upper fixed sheave for the proximal arm and a lower fixed sheave for the proximal arm are respectively provided at the upper part and the lower part of the proximal arm, and a movable sheave is arranged between the fixed sheaves, and a rope winding drum is pivotally attached to the proximal arm. A retracting rope is fitted with a driving means, one end of which is fixed to the rope winding drum and the other end is connected to a movable arm; After passing it around between the fixed sheave and the movable sheave, connect one pressing rope that is fixed to the upper fixed sheave side (or base end arm) or the movable sheave side, and one end of the rope is fixed to the movable sheave side, and the other end is fixed to the base end arm. The other pressing rope is locked to the movable arm via the lower fixed sheave for the arm, and the synchronization rope is locked to the movable arm via the fixed sheave provided at the bottom of the intermediate arm, with one end locked to the proximal arm or intermediate arm. A multi-stage telescopic arm for construction machinery, characterized by being extendable and retractable using a rope. (2) Claim (2) characterized in that the other end of said retracting rope, which has one end locked to the rope winding drum, is locked to the proximal arm side via a fixed sheave provided at the upper part of the distal arm.
1) The multistage telescopic arm of the construction machine described above. (3) The other end of the other pressing rope, which has one end locked on the movable sheave side, is connected to the lower fixed sheave for the proximal arm, the upper fixed sheave for the intermediate arm and the lower fixed sheave for the intermediate arm, which are provided above and below the intermediate arm. Claims (1) to (2) characterized in that the movable arm is locked after being hung around the movable arm in sequence.
) Multi-stage telescoping arms for construction machinery. (4) Claims (1) to (4) characterized in that the pulling rope and the pressing rope are wound multiple times around a rope winding drum, and the rope is clamped at an appropriate position on the rope winding drum. (3) The multi-stage telescopic arm of the construction machine described above.