JPH0733231B2 - Rope pulling 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 improvement of a rope pulling device used as a hoisting machine for construction cargo handling such as a gondola, an elevator and a crane, and is intended to improve reliability and maintainability.

[0002]

2. Description of the Related Art One of winding machines for construction cargo handling such as a gondola, an elevator, and a crane does not have to wind or rewind a rope around a drum, but it can be wound around a sheave once to several times. There is a rope towing device that moves up and down along the rope.

For example, as shown in FIG. 7, a rope pulling device used for moving a gondola used for wall work of a building structure or the like has an outer periphery of a drive shaft 2 provided in a machine frame 1. Is provided with a sheave 4 provided via a bearing and driven by a drive mechanism (not shown), and a traction mechanism 6 that pushes the rope 5 wound around the sheave 4 once so as not to slip.

This traction mechanism 6 is provided with a V-shaped swing arm 8 near the portion of the rope 5 on the pulling side away from the sheave 4, and has two rollers 9 at one end thereof.
9 is provided so as to push the rope 5 inward of the tensioned state, and at the other end, presser rollers 10 and 10 for holding the rope 5 wound around the sheave 4 are attached via swinging arms 11. Is configured.

Therefore, when the rope 5 is in a tensioned state, the rollers 9, 9 at one end which are in contact with the rope 5 are pulled in, whereby the swing arm 8 swings, and the pressing rollers 10, 9 at the other end are pulled. Rope 5 in sheave 4 by 10
Will be suppressed.

[0006]

However, in the traction mechanism 6 of such a rope pulling mechanism, the swinging arm 11 is used.
Sheave 4 with two presser rollers 10, 10 attached to
Since the wire rope 5 is pressed down, a bending moment is repeatedly applied to the wire rope 5 at two points in the front and back around the contact point with the V groove of the sheave 4, and the pressing rollers 10 and 10 are laterally twisted by the twist of the wire rope 5. There is a problem in that the life of the wire rope 5 is shortened due to wear of the wire rope 5 due to slipping due to the force in the direction.

When the wire rope 5 is worn and its diameter changes, the state of the swing arm 8 before swinging changes,
Even if the rollers 9, 9 are moved by the wire rope 5, the pressing force obtained, that is, the traction force is changed, which causes a problem of instability.

The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to provide a rope pulling device which can prolong the life of the wire rope without causing wear or the like and can obtain a large pressing force. It is what

[0009]

The rope towing apparatus of the present invention which achieves the above object is a rope towing apparatus for moving a tow rope while winding the tow rope around a sheave that is rotationally driven. Both side plates contacting the side surface are made of an elastic body, and the both side plates are alternately attached to the sheave by bolts in the circumferential direction of the sheave so that the distance between the both side plates becomes smaller than the rope diameter by a predetermined value. It is characterized by that.

Further, in one aspect of the present invention, in the rope pulling device of the present invention, instead of alternately mounting both side plates in the circumferential direction of the sheave with bolts in the above-described structure, they face each other in the circumferential direction of the sheave. It is characterized in that it is attached to the sheave by bolts from both sides in position.

[0011]

[Action] Both side plates made of an elastic body are alternately attached to the sheave by bolts in the circumferential direction of the sheave. When the rope is pushed between the side plates, the space between the side plates is narrower than the rope diameter. The side plate on the side where is not attached bends in the opposite direction, and the side plates on the whole side bend in a wavy shape in the circumferential direction as a result. The frictional force between the rope and the side plates increases, the rope pressing force by the sheave increases, and the power transmission from the sheave is efficiently performed.

When the side plates are attached from both sides at the positions facing each other in the circumferential direction of the sheave by bolts, the rope is deformed by pressure at the bolt attachment portion, while the ropes are not attached by the bolts. Since the rope bends so as to bulge on both sides, a wedge effect is generated in the portion of the rope where the bolt is attached due to the tension of the rope, and the frictional force increases and the rope pressing force by the sheave increases.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 3 and 4 relate to an embodiment of the rope pulling device of the present invention. FIG. 3 is a partially cutaway front view, and FIG. 4 is a sectional view taken along the line AA in FIG. In the rope pulling device 30, the sheave 32 provided in the machine frame 31 is composed of a sheave body 33 and sheave side plates 35, 35 attached to both sides of the sheave body 33 and forming grooves of the wire rope 34.

In the sheave body 33, the outer periphery of the tip portion which is the bottom of the groove is subjected to knurling as one of the concavo-convex processing, if necessary, to increase the friction coefficient. The outer circumference of the outer side of the groove of the sheave body 33 is attached to the machine frame 31 via a ball bearing 36 so as to be rotatable. The sheave side plates 35, 35 attached to the sheave body 33 are formed in a ring shape by using leaf springs.
As shown in FIG. 1B, the reference numerals 5 and 35 are fixed to the sheave body 33 by bolts 37 alternately in the circumferential direction of the sheave.

As shown in FIG. 1C, the bolt 37 fixes the side plate 35 on one side to the sheave body 33, but does not fix the side plate 35 on the other side to the sheave body 33. The side plate on the other side is arranged so that it can be elastically deformed freely. The distance between the side plates 35, 35 is
It is set to be smaller than the diameter of the wire rope 34 by a predetermined value.

The wire rope 3 is placed in the sheave 32.
The guide rollers 38 and 39 (FIG. 4) are provided at equal intervals on the machine frame 31 portion outside the sheave 32 in order to reliably guide the four, and two guide rollers 38 and 39 arranged at the entrance and exit of the wire rope 34 are provided. Each guide roller 3 except 38
The end portion of the wire 9 is arranged so as to enter between the two sheave side plates 35, 35 in a non-contact state, and the two guide rollers 38, 38 arranged at the entrance and exit of the wire rope 34 are the rollers. The width of the sheave side plate 3 is made slightly thicker than the diameter of the wire rope 34 and is made of a leaf spring.
By pushing and opening 5, 35, the wire rope 34 can be easily fed and fed. Also, wire rope 3
A fixed wire guide 40 is provided outside the guide roller 38 on the outlet side of the No. 4 so that the wire guide 40 can be smoothly taken out from the sheave 32.

The sheave 32 is driven by a drive mechanism (not shown) provided via a drive shaft 42 provided in the machine frame 31, but since this drive mechanism is well known, its explanation is omitted. .

Next, the operation of the rope pulling device 30 having this structure will be described. When the sheave 32 is rotationally driven by a drive mechanism (not shown), the wire rope 34 wound almost once is positioned in the sheave groove formed by leaf springs on both sides by the guide rollers 38, 38 attached to the machine frame 31. Then, the wire rope 34 is pinched by the sheave side plates 35, 35, and the driving force is transmitted.

Since the space between the side plates 35, 35 is smaller than the diameter of the wire rope 34 by a predetermined value, the bolt 37
As shown in FIGS. 1 (b) and 1 (c), the side plate 35 on which the wire rope is not attached is pushed by the wire rope 34 and bends in the opposite direction. The face plate is bent in a wavy shape in the circumferential direction. When the sheave 32 is driven here, as shown in FIG. 5, the tension of the wire rope 34 causes a component force in the side plate direction on the bolt mounting side from the center of the wire rope 34 at the mounting position of each bolt 37. Since the frictional force between the wire rope 34 and the side plates 35, 35 increases, the rope pressing force by the sheave 32 increases, and the power transmission from the sheave 32 is efficiently performed.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, as shown in FIG. 2B, the sheave side plates 35, 35 composed of leaf springs are arranged so that the distance between them becomes smaller than the diameter of the wire rope 34 by a predetermined value. The sheave body 33 is provided at a position facing each other in the circumferential direction of the body 33.
Also, it is fixed to the sheave body 33 by a bolt nut 37 inserted into a hole penetrating both side plates 35, 35 and a nut 38 screwed with the bolt nut 37.

In this embodiment, both side plates 35, 3
In No. 5, since the interval is smaller than the diameter of the wire rope 34 by a predetermined value, the wire rope 34 is deformed by being pressed in the bolt attachment portion as shown in FIGS. 2 (b) and 2 (c).
The diameter in the width direction of the rope groove is slightly smaller than the original diameter, while the diameter in the height direction of the rope groove is slightly larger than the original diameter. Also, the sheave body 3 is fixed by the bolt 37.
In the part not attached to 3, the side plate 35
Is flexed on both sides. When the sheave 32 is driven here, as shown in FIG. 6, due to the tension of the wire rope 34, a component force in the direction of both side plates 35, 35 is generated at the portion of the bolt attachment portion where the wire rope is deformed by the pressure, and the wedge is formed. Due to the effect, the frictional force increases and the rope pressing force by the sheave 32 increases.

[0022]

As described above in detail with reference to the embodiments, according to the present invention, the sheave both side plates forming the rope groove are made of an elastic body such as a leaf spring, and the spacing between the both side plates is a rope. Since both sides of the sheave are attached to the sheave with bolts alternately in the circumferential direction of the sheave so that the wire rope can be pressed uniformly from the entire circumference of the sheave, the bending moment can be reduced. In addition, the component force generated by the tension of the rope increases the frictional force between the rope and the side plates, and the rope pressing force by the sheave increases, so that the power transmission from the sheave is performed efficiently.

When the both side plates are attached with bolts from both sides at the positions facing each other in the circumferential direction of the sheave, the rope is deformed by the pressure at the bolt attachment part, while the both side plates are not attached with the bolts. Since the rope bends so as to bulge on both sides, a wedge effect is generated in the portion of the rope where the bolt is attached due to the tension of the rope, and the frictional force increases and the rope pressing force by the sheave increases.

[Brief description of drawings]

FIG. 1 is a view showing a sheave in one embodiment of the present invention,
1 (a) is a perspective view thereof, FIG. 1 (b) is a plan view showing a bolt mounting state, and FIG. 1 (c) is a partial vertical sectional view thereof.

FIG. 2 is a view showing a sheave in another embodiment of the present invention, FIG. 2 (a) is a perspective view thereof, FIG. 2 (b) is a plan view showing a bolt mounting state, and FIG. It is a partial longitudinal cross-sectional view.

FIG. 3 is a front view showing an embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA in FIG. 3 of the same embodiment.

FIG. 5 is a diagram showing an operation of one embodiment of the present invention.

FIG. 6 is a diagram showing the operation of another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a conventional rope towing device.

[Explanation of symbols]

 33 Sheave main body 34 Wire rope 35 Side plate 37 Bolt

Claims (2)

[Claims] 1. A rope towing device for moving a tow rope around a sheave driven to rotate while moving the tow rope, wherein both side plates contacting a rope side surface of the sheave are provided.
A leaf spring , and the side plates are attached to the sheave by bolts alternately in the circumferential direction of the sheave so that the distance between the side plates is smaller than the diameter of the rope by a predetermined value .
And when the rope is pushed between the side plates, the bolt is attached.
The side plates on the side that is not bent bend in the opposite direction
Each side has a thickness such that the plate as a whole bends in a wavy shape in the circumferential direction.
A rope towing device characterized in that a face plate is formed . 2. A rope towing device for moving a tow rope around a sheave driven to rotate while moving the tow rope, wherein both side plates contacting a rope side surface of the sheave are provided.
A leaf spring , and the both side plates are attached to the sheave by bolts from both sides at positions facing each other in the circumferential direction of the sheave so that the distance between the both side plates is smaller than the diameter of the rope by a predetermined value. Low between the side plates
The part that is not attached by the bolt when the
At the thickness so that the both side plates bulge on both sides
A rope towing device characterized in that a face plate is formed .