JP3225677B2 - Excavator hanging rope guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator for excavating a hole for forming a continuous wall or the like in the ground, and a rope guide device for guiding a suspension rope for suspending the excavator between the tip of the boom and the excavator. It is about.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS.

[0003] In FIG. 7, reference numeral 1 denotes a base machine (body of a crane) of an excavator.
Are mounted so as to be pivotable about a vertical axis X, and a boom 4 is mounted on the upper revolving unit 3.

[0004] Two idler sheaves 5 and four point sheaves 6 are provided at the tip of the boom 4, and one leaving sheave (return guide sheave) 7 is provided at the top of the boom.

On the other hand, an excavator (electric or hydraulic type) 8
Is provided with a running block 9, and the running block 9 is provided with two running sheaves 10.

The upper revolving unit 3 is provided with both winches 11 and 12 for main winding and auxiliary winding. A suspension rope 13 drawn from the winch 11 for main winding is connected to an idler sheave 5 as shown in FIGS. → Point sheave 6 → running sheave 10 → point sheave 6 and then change direction at leaving sheave 7 → point sheave 6, then run sheave 10 → point sheave 6 → idler sheave 5 and make-up winch. 12 is introduced.

In this manner, the suspension rope 13 is driven by both the main winding and auxiliary winding winches 11 and 12, whereby the excavator 8 descends and rises, and a hole H for forming a continuous wall or the like is formed in the ground (FIG. 9). Is excavated.

[0008] By employing such a two-drum system, it is possible to excavate a hole at a high depth.

[0009]

In this type of excavator, since the main body of the crane is used as it is as the base machine 1, the idler sheave 5 and the point provided on the boom 4 as a rope guide member for crane operation are used. The sheave 6 is used as it is as a guide sheave of the hanging rope 13, and only the leaving sheave 7 is added for the excavator.

Here, the point sheave 6 is made as large as possible in order to increase the bending radius of the rope and extend the life of the rope.

On the other hand, since the running sheave 10 of the running block 9 enters the hole H together with the excavator 8, the diameter thereof is set to be equal to or less than the width of the hole H.

Therefore, when a hole H having a particularly small width is excavated, a difference (a> b) occurs between the diameters a and b of the point sheave 6 and the running sheave 10, as shown in FIG. Due to the difference, the hanging rope 13 becomes narrower between the sheaves 6 and 10 when viewed from the side (the rope interval c is not constant).

In this case, during the excavation, the suspension rope 13 interferes with the entrance of the hole H to hinder the excavation work, and the rope 13 is severely worn and damaged.

Conventionally, as a countermeasure against this point, FIG.
Point sheave 6 and running block 9 as shown in
A guide block 14 is attached to the boom 4 between the guide block 14 and a plurality of guide sheaves (not shown) provided in the guide block 14 to reduce the rope interval below the point sheave 6 and to reduce the rope interval below the block. Is equal to the diameter dimension of the running sheave 10.

However, although the problem of interference between the rope 13 and the hole entrance can be solved, a new problem is that the lifting height is reduced by the addition of the guide block 14. For this reason, for example, when the excavator is moved, even if the excavator 8 is lifted to the maximum, a problem such as hitting an obstacle on the ground occurs.

Accordingly, the present invention provides a rope guide device for an excavator that can prevent interference between a suspension rope and a hole entrance portion while increasing a lifting height.

[0017]

According to a first aspect of the present invention, there is provided a base machine, a boom mounted on the base machine,
An excavator having an excavator suspended at the tip of a boom by a suspending rope pulled out from a winch, wherein a point sheave in which the suspending rope is passed through the tip of the boom, the point sheave in the excavator, A pair of running sheaves around which the hanging rope is hung is provided so as to be rotatable about a horizontal axis in the left-right direction, and at a position below the point sheave, a leaving sheave is provided on the front face of the boom tip. A rotatable rope that is rotatable around the horizontal axis in the front-rear direction, and is provided at a position where the hanging rope can be guided in a substantially vertical state or a state in which the rope interval is widened between the running sheave and the leaving sheave in a side view. It is.

According to a second aspect of the present invention, in the configuration of the first aspect, the sheave interval between the two point sheaves, the sheave interval between the two running sheaves, and the diameter dimension of the leaving sheave are the same, and the leaving sheave is pointed in a front view. It is located between two vertical lines connecting the sheave and the running sheave.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the leaving sheave frame to which the leaving sheave is attached is attached to the boom so as to be rotatable about a horizontal horizontal axis. .

According to a fourth aspect of the present invention, in the configuration of the third aspect, mounting portions to which the leaving sheave frame is mounted are provided at a plurality of locations at the end of the boom.

[0021]

According to the above construction, the hanging rope is guided back by the leaving sheave between the point sheave and the running sheave, and guided substantially vertically or downwardly in a side view between the leaving sheave and the running sheave. You.

Therefore, unlike the conventional guide structure in which the rope is tapered downward, there is no possibility that the suspension rope interferes with the entrance of the excavation hole.

Accordingly, since a guide block for reducing the rope interval is not required, the lifting height can be increased.

On the other hand, in an excavator, a hose and a cable may be attached to the excavator, and these may be lowered and raised together with the excavator. In this case, a method is adopted in which a clamp is attached to the suspension rope as the excavation progresses, and a hose or the like is grasped and held by the clamp.

In such a case, the clamp cannot be attached unless the rope interval of the suspension rope is substantially constant in both the side view and the front view.

On the other hand, in the invention of claim 2,
Since the rope interval is substantially constant not only in the side view but also in the front view, the clamp can be attached to the suspension rope at any position.

According to the third aspect of the present invention, when the boom is tilted from the working posture, the leaving sheave is rotated accordingly, and there is a possibility that a trouble such as the rope coming off the sheave may occur. Absent.

Further, according to the configuration of the fourth aspect, the mounting position of the leaving sheave can be changed according to a change in working conditions such as a boom angle at the time of working.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

In the following embodiment, FIGS.
The same parts as in the prior art shown in FIG.
The duplicate description is omitted.

As shown in FIGS. 1 to 3, a pair of left and right point sheaves 6, 6 are provided at the top of the boom 4 so as to be rotatable around a point sheave shaft 6a.

On the other hand, a link 15 is attached to the front face of the boom tip, which is slightly below the point sheaves 6, 6, and a leaving sheave frame 17 with a leaving sheave 16 attached thereto is attached to the link 15,
The rotation center shaft (leaving sheave shaft) 16a is perpendicular to the point sheave shaft 6a and the running sheave shaft 10a, and is mounted to be rotatable about a horizontal axis 18 in the left-right direction.

The link 15 has booms 4 at both upper and lower ends.
The lower end of the link is mounted using a rope end fastening bracket 19 originally provided on the boom 4 to stop the rope end (rope socket) during crane operation.

On the lower surface of the sheave frame 17, a hydraulic tag line 20 for suspending a discharging hose (not shown, a hose reel for feeding the hose in some cases) is provided.
Is attached.

The hanging rope 13 is, as shown in FIG.
After passing from the main winding winch 11 to the one point sheave 6 via the idler sheave 5, it is turned back by one running sheave 10 → leaving sheave 16 → the other running sheave 10, and then the other point sheave 6 and idler It is introduced into the auxiliary winch 12 via the sheave 5.

Here, the positional relationship between the point sheaves 6 and 6, the running sheaves 10 and 10, the leaving sheave 16, and the like are set as follows.

As shown in FIG. 2, the sheave intervals between the point sheaves 6, 6 and the running sheaves 10, 10 are set to be equal, and the sheaves corresponding to the left and right phases are arranged on two vertical lines L1, L2. .

As shown in FIG. 2, the leaving sheave 1
6 has the same diameter as the sheave interval (= rope interval in a front view) W2 of the point sheaves 6, 6 and the running sheaves 10, 10, and between the two vertical lines L1, L2 in a front view. Have been placed.

As shown in FIG. 1, the leaving sheave 16 is attached to a position where the hanging rope 13 can be guided vertically with the running sheave 10 in a side view.

By setting such conditions, the hanging rope 1
3 is guided vertically between the sheaves 6, 10, 16 both in the side view and the front view, so that the rope intervals W1, W2 are constant.

Therefore, as shown in FIG.
As a result of being guided downward in side view,
Since the problem that the rope 13 interferes with the entrance portion of the excavation hole H is eliminated, a rope guide means (the guide block 14 in FIG. 7) for avoiding the problem is not required. Therefore, the lifting height can be increased.

In addition, since the rope interval W2 is constant even when viewed from the front, when the clamp is attached to the hanging rope 13 to hold and hold a hose or the like, the clamp can be attached without any trouble at any rope position. it can.

Further, when the boom 4 is tilted from the working position, the leaving sheave 16 is moved along the horizontal
Since it rotates around 8, there is no possibility that a trouble such as the rope 13 coming off the sheave 16 as in the case where the sheave 16 is fixed to the boom 4 will occur.

Other Embodiments (I) In the above embodiment, the leaving sheave 16 is provided at a position where the hanging rope 13 is vertically guided in a side view. When the clamp is attached to the suspension rope 13, the clamp may be provided at a position where it is guided in a slightly lowered state that does not hinder the attachment of the clamp.

(II) When the clamp is not used, or when the clamp is made telescopic so as to be able to cope with a change in the distance between the ropes, as shown in FIG. 13 may be provided at a position guided downward.

Further, as shown in FIG. 5, the diameter of the leaving sheave 16 is formed to be smaller than the distance W2 between the vertical lines L1 and L2, and the hanging rope 13 is connected to the leaving sheave 16 and the running sheave 10 in a front view. It may be made to be guided in a downward spread between.

(III) In the above embodiment, the link 15 is provided between the rope end fastening bracket 19 and the leaving sheave 16 in order to absorb the difference between the position of the bracket 19 and that of the leaving sheave 16.
Under the condition that there is no deviation between the two positions (boom angle, running sheave diameter, etc.), the leaving sheave 16 (sheave frame 17) is directly attached to the rope end fastening bracket 19 as shown in FIG. It may be mounted so as to be rotatable around the horizontal horizontal axis 18.

(IV) As shown in FIG.
Separately from 9, mounting holes 23 may be provided at a plurality of locations on the front side of the boom front end in the boom length direction so that the mounting position of the leaving sheave 16 can be changed according to the working conditions.

[0049]

As described above, according to the present invention, a leaving sheave is rotatable around the horizontal axis in the front-rear direction and is suspended from the side in front of the boom tip at a position below the point sheave. Since the rope is provided at a position where it can be guided in a substantially vertical state between the running sheave and the leaving sheave or in a state where the rope interval is widened downward, there is no possibility that the suspension rope will interfere with the entrance of the excavation hole.

Accordingly, a guide block for narrowing the rope interval is not required, so that the lifting height can be increased.

According to the second aspect of the present invention, the rope interval is substantially constant not only in a side view but also in a front view. Therefore, in the case of an excavator in which a clamp for holding and holding a hose or the like is attached to a suspension rope, Can be attached to the hanging rope at any position.

Further, according to the third aspect of the present invention, when the boom is tilted from the working posture, the leaving sheave is rotated accordingly, which may cause troubles such as the rope coming off the sheave. Absent.

Further, according to the invention of claim 4, the mounting position of the leaving sheave can be changed in accordance with a change in the boom angle (work radius) during work.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a schematic perspective view for explaining a rope guide state in the embodiment.

FIG. 4 is a side view showing another embodiment of the present invention.

FIG. 5 is a front view showing still another embodiment of the present invention.

FIG. 6 is a side view showing still another embodiment of the present invention.

FIG. 7 is a schematic side view of the entire excavator for explaining the prior art.

FIG. 8 is a schematic perspective view showing a rope guide state according to the related art.

FIG. 9 is a side view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base machine 4 Boom 8 Excavator 6 Point sheave 6a Point sheave axis 10 Running sheave axis 10a Running sheave axis 13 Hanging rope 16 Leaving sheave 16a Leaving sheave axis 17 Leaving sheave frame 18 Horizontal axis for attaching the same frame 19 Mounting of sheave sheave frame Rope end fastening bracket as part 23 Mounting hole as mounting part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E02F 5/02 B66C 23/66 B66D 1/36 E21B 19/02

Claims (4)

(57) [Claims] An excavator comprising a base machine, a boom mounted on the base machine, and an excavating device suspended at a tip of the boom by a hanging rope pulled out from a winch. A point sheave through which the suspension rope is passed, a pair of left and right running sheaves around which the suspension rope is hung between the point sheave and the excavator are provided rotatably around a horizontal axis in the left-right direction. At a position lower than the point sheave, a leafing sheave is provided at the front of the boom tip, and is rotatable around a horizontal axis in the front-rear direction, and the suspension rope is substantially vertical between the running sheave and the leafing sheave in a side view. Characterized in that it is provided at a position where it can be guided in a state or a state where the rope interval is widened downward. Hanging rope guide device for cutters. 2. The sheave interval between both point sheaves, the sheave interval between both running sheaves, and the diameter dimension of the leaving sheave are the same, and the leaving sheave is formed by two vertical lines connecting the point sheave and the running sheave in a front view. The suspension rope guide device for an excavator according to claim 1, wherein the suspension rope guide device is located between the suspension ropes. 3. The suspension rope of an excavator according to claim 1, wherein the leaving sheave frame to which the leaving sheave is attached is attached to the boom so as to be rotatable around a horizontal horizontal axis. Guide device. 4. The suspension rope guide device for an excavator according to claim 3, wherein attachment portions to which the leaving sheave frame is attached are provided at a plurality of positions at the end of the boom.