JP2001115482A - Multi-stage expansion arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-stage expansion arm having an equalizer device which is excellent in tension balance effect of a pair of hoisting ropes, excellent in engagement with a pair of sheave for the hoisting rope and easy in adjustment work. SOLUTION: A pair of sheaves 17 for a hoisting rope are mounted on a lower end of one or a plurality of intermediate arms 8 between a base end arm 6 and a tip arm 8. One end of the hoisting rope 15 respectively stretched over the sheaves 17 for the hoisting rope is connected to an equalizer device 16 provided on an arm 7 adjacent to the outer side of the intermediate arms 7 with the sheaves 17 mounted thereon. The other end of each hoisting rope 15 is connected to an upper part of the arm 8 adjacent to the inner side of the intermediate arms 7. The equalizer device 16 comprises an equalizer sheave 22 and an equalizer rope 25 stretched over the equalizer sheave 22 and connected to one end of the hoisting rope 15 having a pair of ends thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage telescopic arm mounted on a deep excavator, and more particularly, to a multi-stage telescopic arm attached to a lower end of one or more intermediate arms between a base arm and a distal arm. A pull-up rope sheave is attached.
One end of each pulling rope hung around each pulling rope sheave is connected to an equalizer device provided on an arm adjacent to the outside of the intermediate arm to which the sheave is attached, and the other end of each pulling rope is The present invention relates to a multistage telescopic arm connected to an upper portion of an arm adjacent to the inside of the intermediate arm, and more particularly to an equalizer device for equalizing tension of a pair of pulling ropes.

[0002]

2. Description of the Related Art In a multi-stage telescopic arm attached to a deep excavator, a lower end of the intermediate arm is provided at a lower end of the intermediate arm in order to prevent an arm below the intermediate arm from dropping due to cutting of a pulling rope.
Attach the sheaves, attach a pulling rope to each sheave, connect both ends to the inner and outer arms adjacent to the pulling rope, and support one of the sheaves with the other pulling rope even if the pulling rope is cut. It is configured as follows. When providing a pair of pulling ropes in this way, it is preferable to equalize the tension of both pulling ropes in order to prolong the life of the pulling ropes. For this reason, in JP-A-8-338042, as shown in FIG. 6, pulling ropes 52 are connected to both sides of an equalizer bar 51 attached by a shaft 50 so as to be able to swing up and down, and left and right pulling ropes 52 are connected. 52 is intended to equalize the tension.

[0003]

However, according to the above prior art, when the equalizer bar 51 is inclined as shown by a two-dot chain line due to the extension of one pulling rope 52, the connection of the equalizer bar 51 to the pulling rope 52. Since the horizontal distance between the point and the shaft 50 is short, there is a problem that the tension balancing action of the pulling rope 52 is reduced. When the equalizer bar 51 is tilted, the pulling rope 52 is tilted and hooked with respect to the pulling rope sheave 53, so that the pulling rope 5
2 has a problem that an excessive force is easily applied. Further, in order to exhibit the effect of the equalizer satisfactorily, it is necessary to adjust the bar 51 so as to be horizontal, and there is a problem that the adjustment operation is difficult.

[0004] In view of the problems of the prior art, the present invention can exert a good tension balance effect of a pair of pulling ropes, and has a good engagement relationship with a pulling rope sheave. It is an object of the present invention to provide a multi-stage telescopic arm having an equalizer device that facilitates adjustment work.

[0005]

The multi-stage telescopic arm of claim 1 is mounted on a deep excavator and forms a pair at the lower end of one or more intermediate arms between a base arm and a distal arm. One end of the pulling rope to which the pulling rope sheave is attached and hung around each pulling rope sheave is communicated with an equalizer device provided on an arm adjacent to the outside of the intermediate arm to which the sheave is mounted, respectively. In a multi-stage telescopic arm, the other end of each pulling rope is connected to an upper part of an arm adjacent to the inside of the intermediate arm, the equalizer device includes an equalizer sheave and the equalizer sheave. And an equalizer rope connected to one end of the pulling rope.

As described above, by using the equalizer sheave, the distance from the axis of the equalizer sheave to the point of application of the tension balancing action is constant on both the left and right sides, and the tension balancing action is favorably exhibited. In addition, the direction of the pulling rope is always constant, and no force is applied to the pulling rope. Further, in the tension adjusting operation, there is no need to make the leveler horizontal like an equalizer bar, so that the adjusting operation is facilitated.

According to a second aspect of the present invention, there is provided a multi-stage telescopic arm according to the first aspect, wherein stoppers are provided at both ends of the equalizer rope, and the stopper is brought into contact with the arm on which the equalizer sheave is mounted by extending or cutting one of the pulling ropes. It is characterized in that a stopper receiver is provided.

As described above, since the stopper mechanism is provided so that the stopper and the stopper receiver come into contact with each other by elongating or cutting the pulling rope, dropping of the pulling rope due to cutting is prevented.

The multistage telescopic arm according to a third aspect is characterized in that, in the second aspect, the stopper receiver has a trunnion structure rotatably supported about support points on both sides.

As described above, by providing the trunnion-type stopper receiver, even if a misalignment occurs between the pulling rope and the equalizer sheave due to a manufacturing error or the like,
No excessive force is applied to the equalizer rope and pulling rope.

According to a fourth aspect of the present invention, in the multistage telescopic arm according to any one of the first to third aspects, the arm for mounting the equalizer sheave is provided with a sensor for detecting displacement of the equalizer rope due to extension or cutting of the rope.
A striker for operating the sensor is provided on the equalizer rope side, and alarm means for generating an alarm by operating the sensor is provided.

By providing such a sensor and alarm means, it is possible to know the cut or extension of one of the paired pulling ropes.

According to a fifth aspect of the present invention, there is provided a multi-stage telescopic arm according to any one of the first to fourth aspects, wherein a bracket for attaching the pulling rope sheave to the intermediate arm is detachably attached to the intermediate arm. .

In this manner, by making the bracket of the pulling rope sheave detachable, the bracket can be easily replaced when the bracket collides with something and is deformed.

[0015]

FIG. 1 is a side view showing a working state of a deep excavator having a multi-stage telescopic arm according to the present invention, and FIG. 2 is a side view showing a schematic configuration of the multi-stage telescopic arm. 1 and 2, reference numeral 1 denotes a self-propelled body of a deep excavator, in which a revolving unit 1c is installed on a traveling unit 1a via a revolving unit 1b, and a driver's cab 1d is mounted on the revolving unit 1c. ing. 2
Reference numeral denotes a boom mounted on the revolving unit 1c so as to be raised and lowered by a boom cylinder 1e. Reference numeral 3 denotes a multi-stage telescopic arm mounted on the end of the boom 2 so as to be turned around a pin 5 by an arm cylinder 4.

The multistage telescopic arm 3 of this embodiment has a three-stage configuration, and includes a bracket 6 attached to the boom 2.
a base arm (outer arm) 6 having a and an intermediate arm (second arm) slidably fitted inside thereof
7 and a tip arm (inner arm) 8 slidably fitted inside.

As shown in FIG. 2, in the multistage telescopic arm 3, telescopic hydraulic cylinders 9 are provided with pins 10, 11 respectively.
The rods and tubes of the cylinder 9 are connected and attached to the arms 7 and 8 respectively. Reference numeral 12 denotes a pushing rope for giving a pushing reaction force to the multi-stage telescopic arm 3. One end of the pushing rope is connected to the base arm 6, the intermediate portion is hung on a sheave 13 attached to the upper end of the intermediate arm 7, and the other end is attached to the other end. It is connected to the upper part of the tip arm 8. The pushing ropes 12 are provided one each for the left and right sides, for a total of two.

Reference numeral 15 denotes a pulling rope.
5 is provided one for each of the left and right, each pulling rope 15
Is connected to each other via an equalizer device 16 attached to the back of the base arm 6, the intermediate portion is hung on a sheave 17 attached to the lower end of the intermediate arm 7, and the other end is attached to the upper end of the distal arm 8. Connected to and mounted.

As shown in FIG. 1, a digging bucket 19 such as a clamshell bucket is attached to the lower end of the tip arm 8. The entire multi-stage telescopic arm 3 expands and contracts with the action of the pushing rope 12 and the pulling rope 15 due to the expansion and contraction of the hydraulic cylinder 9. When excavating, lower the boom 2, extend the multi-stage telescopic arm 3, lower the excavation bucket 19 into the underground excavation section 20, excavate and put excavated earth and sand into the excavation bucket 19, shrink the multi-stage telescopic arm 3, and raise the boom 2. And discharge it to the truck bed on the ground.

FIG. 3 is a side view showing the equalizer device 16, FIG. 4 is a rear view thereof, FIG. 5 (A) is a longitudinal sectional view thereof, and FIG. 5 (B) is a sectional view taken along line EE of FIG. 5 (A). It is. Reference numeral 22 denotes an equalizer sheave. The equalizer sheave 22 has a shaft 24 attached to a bracket 23 fixed to the rear surface of the base arm 6.
It can be installed freely around the center. Reference numeral 25 denotes an equalizer rope to be hung on the equalizer sheave 22. Both ends of the equalizer rope 25 are connected to the pulling rope 15 via stoppers 26.

As shown in FIGS. 5A and 5B, the stopper 26 comprises an outer cylinder 26a and an inner cylinder 26b rotatably fitted therein. Then, a pin 27 is attached to one end of the outer cylinder 26a, and the end 25 of the equalizer rope 25 is connected to the pin 27. A screw rod 15a fixed to the tip of the pull-up rope 15 has a screw hole 29 at the tip of the inner cylinder 26b, and the tip 26d of the inner cylinder has a nut shape.
Is screwed into the screw hole 29 and joined. 30 is a screw rod 1
It is a fastening nut screwed into 5a.

The outer cylinder 26a has a hole 3 in the stopper receiver 31.
1a to be slidably fitted. Reference numeral 32 denotes a pair of brackets fixed to the base arm 6, and a pin 33 penetrating the bracket 32 is rotatably fitted into a circular hole 31b provided on both sides of the stopper receiver 31 as shown in FIG. As shown by an arrow R, the stopper receiver 31 is rotatable about a pin 33 serving as a fulcrum. The outer cylinder 26a has a flange 26c, and a gap G between the flange 26c and the stopper receiver 31.
(See FIG. 5A). When one of the pulling ropes 15 is cut or extended, the cut or extended side stopper 26 rises, while the flange 26 c of the stopper 26 on the unstretched or uncut side of the pulling rope 15 engages the stopper receiver 31. To prevent the pulling rope 15 from dropping, thereby preventing the portion of the multistage telescopic arm 3 below the intermediate arm 7 from falling.

As shown in FIG. 4, the equalizer sieve 22
A sensor 34 for detecting a displacement of the equalizer rope 22 due to elongation or cutting of the pulling rope 15 is provided on the base arm 6 to be attached. And equalizer rope 2
A striker 35 for operating the sensor 34 is provided on the second side. In this example, a striker 35 is attached to a stopper 26 that moves together with the equalizer 22. Also,
In this example, a proximity sensor is used as the sensor 34,
An example in which a magnetic material is used as a striker will be described.
As 4, another sensor such as a limit sensor may be used. If the striker 35 is located at a position facing the sensor 34, the sensor 34
Although the warning by the warning means 36 such as a lamp provided for is not issued, if the flange 26c of the stopper 26 comes into contact with the stopper receiver 31 or is displaced to the opposite side due to extension or cutting of the one pulling rope 15, An alarm is issued by the alarm means 36 by the operation of the sensor 34, thereby notifying the disconnection or extension of the pulling rope 15.

At the lower end of the intermediate arm 7, a pulling rope 15
The mounting seat 37 of the sheave 17 is fixed.
Further, a bracket 40 for attaching the sheave 17 with pins 39 is detachably attached with bolts 41 and nuts 42.

As described above, by using the equalizer sheave 22 as the equalizer device as the equalizer device 16, as shown in FIG. 4, the point of action exerting the tension balance action from the shaft 24, that is, the outer periphery of the equalizer sheave 22. The distance r is constant on both the left and right sides regardless of the elongation of the pulling rope 15, so that the tension balance action is favorably exhibited. In addition, the direction of the pulling rope 15 is constant, and no force is applied to the pulling rope 15. Further, in the tension adjusting operation of the pulling rope 15, the adjustment is performed such that the gap G between the flange 26c of the stopper 26 and the stopper receiver 31 is the same for the left and right stoppers 26. In this case, like the equalizer bar, Since there is no need to make it horizontal, the adjustment operation is facilitated. In addition,
Each connecting portion of the pulling rope 15 and the distal end arm 8 also has a length adjusting mechanism.

The stopper receiver 31 is provided with pins 3 from both sides.
3, the stopper receiver 31 is rotated in accordance with the misalignment even if a misalignment occurs between the pulling rope 15 and the equalizer sheave 22 due to a manufacturing error or the like. By moving, no excessive force is applied to the equalizer rope 22 and the pulling rope 15.

Further, since the bracket 40 for attaching the pull-up rope sheave 17 to the intermediate arm 7 is detachably attached to the intermediate arm 7, the bracket 40 can be easily mounted when the bracket 40 collides with something and is deformed. Can be replaced.

The present invention can be applied not only to the three-stage telescopic arm described above, but also to a multi-stage telescopic arm having four or more intermediate arms 7 having a plurality of stages. Further, the multi-stage telescopic arm 3 can be attached to an arm attached to the tip of a boom of a hydraulic excavator to constitute a deep excavator.

[0029]

According to the first aspect of the present invention, since the equalizer sheave is used as the equalizer device, the distance from the shaft of the equalizer sheave to the application point of the outer periphery that exerts the tension balance action is constant on both the left and right sides, and the tension balance action is achieved. Is exhibited well. Further, the direction of the pulling rope is constant, and no force is applied to the pulling rope. Also,
In the tension adjustment operation, there is no need to make the tensioner horizontal like an equalizer bar, so that the adjustment operation is facilitated.

According to the second aspect, the stopper mechanism is provided so that the stopper and the stopper receiver come into contact with each other by elongating or cutting the pulling rope, thereby preventing the pulling rope from dropping due to cutting.

According to the third aspect of the present invention, since the stopper receiver has a trunnion structure, even if a misalignment occurs between the pulling rope and the equalizer sheave due to a manufacturing error, etc. Unreasonable force is not applied, and the life of these ropes can be extended.

According to the fourth aspect of the present invention, since the sensor and the alarm means for detecting the elongation or breakage of the pulling rope are provided, the operator is notified of the breakage or elongation of one of the pulling ropes and the lifting is performed. It is possible to quickly cope with elongation or cutting of the pull-up rope without leaving the state in which one rope is operated and left alone.

According to the fifth aspect, the bracket of the pulling rope sheave is configured to be detachable, so that if the bracket collides with something and is deformed, the bracket can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a deep excavator equipped with a multi-stage telescopic arm according to the present invention in a working state.

FIG. 2 is a schematic configuration diagram of the multi-stage telescopic arm of FIG. 1;

FIG. 3 is a side view of the equalizer device of the present embodiment.

FIG. 4 is a rear view of the equalizer device according to the present embodiment.

FIG. 5A is a longitudinal sectional view of the equalizer device of the present embodiment, and FIG. 5B is a sectional view taken along line EE of FIG.

FIG. 6 is a diagram illustrating a problem of a conventional equalizer bar.

[Explanation of symbols]

1: body, 2: boom, 3: multi-stage telescopic arm, 4: arm cylinder, 6: base arm, 7: intermediate arm, 8: distal arm, 12: push rope, 13: sheave, 15: pulling rope, 15a: Screw rod, 16: Equalizer device, 17: Sheave, 19: Drilling bucket, 22: Equalizer sheave, 23: Bracket, 24: Shaft, 25: Equalizer rope, 26: Stopper, 26a: Outer cylinder, 26
b: inner cylinder, 26c: flange, 29: screw hole, 30: nut,
31: stopper receiver, 31b: circular hole, 32: bracket, 33: pin, 34: sensor, 35: striker, 3
6: alarm means, 37: mounting seat, 40: bracket

Claims (5)

[Claims] A pair of pulling rope sheaves are mounted on the lower end of one or more intermediate arms between a base arm and a distal arm, the pulling rope sheaves being mounted on a deep excavator; One end of each of the pulling ropes wound around the sheave is connected to an equalizer device provided on an arm adjacent to the outside of the intermediate arm to which the sheave is attached, and the other end of each pulling rope is connected to the intermediate arm. In a multi-stage telescopic arm connected to an upper part of an arm adjacent to the inside, the equalizer device includes an equalizer sheave, and an equalizer rope that is hung on the equalizer sheave and has both ends connected to one end of the pair of pulling ropes. And a multi-stage telescopic arm. 2. The equalizer rope according to claim 1, wherein stoppers are provided at both ends of the equalizer rope, and a stopper receiver is provided on an arm on which the equalizer sheave is mounted, the stopper being brought into contact with the stopper by extension or cutting of one pulling rope. Multi-stage telescopic arm characterized by the following. 3. The multi-stage telescopic arm according to claim 2, wherein the stopper receiver has a trunnion structure rotatably supported around support points on both sides. 4. An equalizer sheave according to claim 1, further comprising: a sensor for detecting a displacement of the equalizer rope due to elongation or cutting of the rope, provided on the arm on which the equalizer sheave is mounted, and the sensor is provided on the equalizer rope side. A multi-stage telescopic arm provided with a striker to be operated and alarm means for generating an alarm by operation of the sensor. 5. The multi-stage telescopic arm according to claim 1, wherein a bracket for attaching the pull-up rope sheave to the intermediate arm is detachably attached to the intermediate arm.