JP3770987B2 - Co-rotation prevention device for swivel device in excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an excavator equipped with a swivel device for supplying a chemical solution, and more particularly to a co-rotation preventing device for a swivel device.
[0002]
[Prior art]
Conventionally, a long excavation rod is vertically extended through a drive unit that is mounted on a short leader mast so as to be movable up and down. There is an excavator equipped with a swivel device for supplying a chemical solution into the ground through a chemical solution flow hole provided in the ground.
[0003]
In the excavator provided with the swivel device as described above, a co-rotation preventing means is provided to prevent the fixed side member outside the swivel device from co-rotating with respect to the rotation of the excavation rod.
[0004]
The conventional co-rotation preventing means is disclosed in, for example, Japanese Patent Laid-Open No. 5-239983. In the device described in this publication, a cross member extending to both sides of the swivel device is attached to a fixed side member of the swivel device, and the other end of each wire bonded to both ends of the cross member is connected to a work vehicle (base machine) via a joint. ) Is wound around a tension applying drum device mounted thereon, and tension is applied to the left and right wires to prevent rotation of the fixed side member of the swivel device via the cross member.
[0005]
[Problems to be solved by the invention]
Therefore, in the above-described conventional apparatus, the tension of the left and right wires varies depending on the work situation, so it is necessary to always apply tension to both wires, and therefore it is essential to provide special tension applying means and the like. In addition, the device itself must be large, and the right and left wires exist on both sides of the swivel device at the same time. There is a problem in that it causes a significant hindrance during the construction at the corners.
[0006]
[Means for Solving the Problems]
The present invention can prevent the swivel device from co-rotating with a simple structure, and can prevent co-rotation without the need for a member projecting to the side, and can be used without any trouble even in a narrow field. A reaction force receiving arm protruding from the fixed side member of the swivel device to the leader mast side is provided on the fixed side member so as to be rotatable in the vertical direction, and one end of a wire is connected to the reaction force receiving arm. The other end of the wire is connected to a winch, a guide roller is pivotally attached to the reaction force receiving arm, and is formed to be engageable with a guide rail provided on the leader mast. The wire guide sheave is provided at the upper end of the mast.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0008]
FIG. 1 shows an outline of the excavator as a whole. The lower end of a short leader mast 2 is supported by a shaft 3 on a support portion of a base machine 1 capable of self-propelling. The drive unit 6 is illustrated along the guide rail 5 provided in the vertical direction on the front side of the leader mast 2. It is mounted so that it can be raised and lowered by a wire that does not.
[0009]
An excavation rod 7 having a square cross section extends vertically through the drive unit 6 and extends upward. As is well known, the excavation rod 7 is rotated by a hydraulic motor 9 mounted on the drive unit 6 through a rotation transmission mechanism. And lockable. The lower portion of the excavation rod 7 is held by the chuck device 10 in the base machine 1, the excavation head 11 is provided at the lower end of the excavation rod 7, and the stirring blade 12 is provided at the upper position. Show.
[0010]
The excavation rod 7 is provided with a chemical flow hole 13 for passing a chemical solution such as cement milk, and the chemical liquid is jetted and supplied from the excavation head 11 at the lower end of the excavation rod 7 into the excavation ground.
[0011]
A swivel device 14 having a rotary joint structure for supplying a chemical solution to the chemical solution circulation hole 13 is provided at the upper end of the excavating rod 7 and communicates with a base solution 1 or a chemical solution supply source (not shown) installed on the ground. The chemical solution supply hose 15 is connected to the stationary member 14 a of the swivel device 14.
[0012]
The bearing portion 14b of the fixed member 14a of the swivel device 14, shown enlarged in FIG. 2, as shown in the plan view of FIG. 2 in FIG. 3, the reaction force receiver arm 16 projecting leader mast side shaft As shown by a chain line in FIG.
[0013]
Guide rollers 18 and 18 are axially attached to the distal end of the reaction force receiving arm 16 and one end of a wire 19 is connected. The wire 19 is a wire that is rotatably attached to the upper end of the leader mast 2. A guide sheave 20 is connected to a wire winding winch 21 provided below the leader mast 2 so as to be freely wound.
[0014]
The guide rollers 18, 18 have flanges 18a, 18a on one side, and the reaction force receiving arm 16 has a bifurcated tip, and the flange 18a is located on the inner surface side of each bearing portion 16a, 16a. Thus, the bearings 16a and 16a are rotatably attached to the same axis by the shafts 22 and 22, and the wire 19 is connected to the wire connecting part 16b positioned between the bearing parts 16a and 16a. It is connected through.
[0015]
The leader mast 2 is provided with guide rails 23, 23 that can be engaged with the guide rollers 18, 18 at both sides of the side surface facing the excavation rod 8, and the upper ends of the guide rails 23, 23 are It extends upward beyond the wire guiding sheave 20, and the upper end portion of the extended portion 23a is inclined upward of the sheave 20, and when the guide rollers 18, 18 reach the upper end position of the inclined portion 23b, The reaction force receiving arm 16 is configured to have a substantially horizontal posture.
[0016]
Next, the operation of the above embodiment will be described.
[0017]
The wire 19 connected to the reaction force receiving arm 16 is wound by the winch 21 to keep the wire 19 in a tensioned state, the hydraulic motor 9 of the driving unit 6 is driven to rotate the excavating rod 7, and the excavating head 11 The ground is excavated, and the chemical is supplied from the supply hose 15 through the swivel device 14 to the chemical flow hole 13 in the excavation rod 7 and is injected into the ground from the lower end of the excavation rod 7.
[0018]
When excavation by the excavation rod 7 proceeds and the reaction force receiving arm 16 descends and reaches the upper end of the leader mast 2, the guide rollers 18, 18 at the tip of the reaction force receiving arm 16 are moved to the upper ends of the guide rails 23, 23. The reaction force receiving arm 16 descends while rotating upward about the shaft 17 due to the reaction force, and passes through the vertical portion of the extension portion 23a of the guide rails 23, 23 by the reaction force. When the rollers 18 are engaged with each other, the reaction force receiving arm 16 descends along the leader mast 2 while keeping the posture rotated upward as shown in the lower part of FIG. The excavation work can be performed without any problem while the left-right swing of the reaction force receiving arm 16 is restricted by the engagement between the guide rails 23 and 23.
[0019]
Therefore, until the reaction force receiving arm 16 reaches the upper end of the leader mast 2, the reaction force receiving arm 16 is restrained from swinging left and right by the tensile force of the wire 19, and the guide roller 18 of the reaction force receiving arm 16 is suppressed. , 18 are engaged with the guide rails 23, 23 of the leader mast 2 to prevent the swiveling to the left and right by the engagement, thereby preventing the swivel device 14 from rotating together.
[0020]
When the drive unit 6 is lowered to a position close to the ground surface, the excavation rod 7 is held by the lower chuck device 10, and then the drive unit 6 is lifted by releasing the pinching of the excavation rod 7 by the drive unit 6, and the drive unit 6 is predetermined. When the height is raised to the height position, the excavation rod 7 is held again to start the second stroke.
[0021]
【The invention's effect】
As described above, according to the present invention, the reaction force receiving arm that protrudes from the fixed side member of the chemical supply swivel device provided at the upper end of the excavation rod to the leader mast side is provided , and one end is connected to this arm. A wire is wound around the winch to make it tensionable, and a guide roller is pivotally attached to the tip of the reaction force receiving arm so that the guide roller can be engaged with a guide rail provided on the leader mast. Until the upper end of the arm is reached, the reaction force receiving arm is prevented from swinging left and right by the pulling force of the wire, and when the guide roller of the reaction force receiving arm is engaged with the guide rail of the leader mast, As a result, the swivel device can be prevented from swiveling, and the swivel device can be prevented from co-rotating. It is possible to prevent the co-rotation of the swivel device, without adversely any trouble in actual drilling operations, and can be obtained at low cost.
[Brief description of the drawings]
FIG. 1 is a side view showing an outline of an embodiment of the present invention.
FIG. 2 is an enlarged view of an upper portion of the excavation rod in FIG.
FIG. 3 is a plan view of FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base machine 2 Leader mast 6 Drive part 7 Excavation rod 9 Hydraulic motor 10 Lower chuck apparatus 11 Excavation head 12 Agitation blade 13 Chemical solution distribution hole 14 Swivel apparatus 14a Fixed side member 15 Chemical solution supply hose 16 Reaction force receiving arm 18 Guide roller 19 Wire 20 Wire guide sheave 21 Wire winding winch 23 Guide rail 23a Extension portion 23b Inclined portion

Claims (1)

A long excavation rod extends vertically through the drive unit in a drive unit mounted on a short leader mast so as to be movable up and down, and provided above the excavation rod in the rod. In an excavator equipped with a swivel device for supplying a chemical solution through a chemical solution circulation hole, a reaction force receiving arm protruding from the fixed side member of the swivel device to the leader mast side is provided on the fixed side member so as to be rotatable in the vertical direction. One end of a wire is connected to the reaction force receiving arm and hangs down, and the other end of the wire is connected to a winch. A guide roller is pivotally attached to the reaction force receiving arm to a guide rail provided on the leader mast. A swivel prevention device for a swivel device in an excavator, wherein the swivel device is formed so as to be engageable and a wire guiding sheave is provided at an upper end of the leader mast.

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