JPS60122699A - Wire rope end attachment device for hoisting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hoisting machine, and more particularly to a hoisting machine equipped with a wire rope end attachment device for supporting the end of a wire rope.

[Background of the invention]

Hoisting machines require safety measures that take into account accidents caused by falling loads, etc. In particular, the wire rope section from which the cargo is directly suspended is given the greatest importance.

For this reason, laws and regulations require inspection of wire ropes and set wire rope wear limits and wire breakage limits.

However, since hoisting machines are usually installed at high places, inspections at dangerous heights are avoided as much as possible, and the wire rope use limit can be determined only by simple inspections on the floor! There are many cases where it ends up being 7.

For this reason, even though the wire rope end portion attached to the hoisting machine is an important inspection part, inspection may be overlooked for the above-mentioned reason.

Therefore, in order to prevent the accident of dropping the load due to the wire rope buoy in this area, it is necessary to increase the safety factor by increasing the lifespan of the wire rope end, that is, by reducing the stress at the wire rope end. It is.

The conventional wire rope terminal device, which was equipped in two ways, is described in, for example, Japanese Patent Publication No. 101563/1983, and this will be explained with reference to FIGS. 1, 2, and 3. .

FIG. 1 is a front view of the hoist, and FIG. 2 is a side view of the hoist as viewed from direction A in FIG.

That is, one end of the wire rope buoy is attached to the drive stand 2,
The other end is attached to a hanging fitting 6 on a support plate 4 provided on the outer frame 3 via a shaft 5. A load block 7 for hoisting a load is suspended by a wire rope 1.

FIG. 3 is a perspective view of the wire rope terminal device with the wire rope 1 attached to the hanging fitting 6, and the socket 8 attached to the end of the wire rope 1 is connected to the
Several lines are attached to the hanging fitting 6 through the .

In the conventional hoisting machine shown in each of these figures, as shown in No. 11a, when the load is swayed due to movement in the clay/travel direction, the load block 7 is moved by the load block 7, indicated by the dashed line. 7a and Hiff b (7, Swings in the J direction.

In this case, since the hanging fitting 6 is attached to the shaft 5 so as to be fixed, it can follow the inclination of the wire rope 1 when the load swings, and no bending load is applied to the root of the wire rope 1 in the bottom 8 section.

However, as shown in FIG. 2, when the load swings due to movement in the transverse direction like hoisting, the movement of the load block 7 is directed toward the load blocks 7c and 7d.

In this case, the hanging fitting 6 cannot move unless the shaft 5 moves in the axial direction.

Therefore, when the wire rope 1 is tilted due to load swing in the transverse direction, the bending action concentrates on the root of the socket 8 with the wire rope attached. For this reason, wire rope attachments generate excessive bending stress in the roots, which is a factor that significantly reduces the service life.

As described above, the structure of the wire rope end attachment device included in the conventional hoisting machine has a drawback that it has poor ability to follow load swing and shortens the life of the wire rope.

[Purpose of the invention]

The present invention has focused on the above-mentioned drawbacks, and is equipped with a wire rope end attachment device that can follow all load swing directions that occur during load transportation and has a high strength and safety factor. It is an object of the present invention to provide a hoisting machine which is designed to avoid the above problems, extend the life of the wire rope, and improve the safety of the hoisting machine.

[Summary of the invention]

In the hoisting configuration according to the present invention, one end of the wire rope is attached to the drum, the other end of the wire rope is fixed to a socket, and this socket is attached to an outer frame support formed on the outer frame of the hoist. In this structure, a shaft is provided in the outer frame support portion, and the shaft has a substantially T-shaped cross section and a concave curved portion in the center of the lower part of the steel plate bent in an inverted U shape. A window is provided at the bottom of each steel plate bent into an inverted U shape, and a seat support plate having an attachment/detachment hole for the socket is passed through the side window and fixed by welding. A wire rope terminal device, which is hung so as to straddle a hanging metal fitting, a socket cutting seat is attached to the receiving plate of the hanging metal fitting, and the socket seat is formed to receive the socket. It is designed to be equipped with the following.

More detailed information is as follows.

In other words, the hanging fitting, which is a component of the wire rope end attachment device, has a safety design on the bent part of the part where the hanging fitting straddles the shaft so that it can be rotated freely with respect to the shaft. It is configured to be attached to the shaft with a swivel support member interposed therebetween, and furthermore, even if the outer part of the hanging bracket comes into contact with the outer frame support plate of the hoisting machine, the hanging bracket can be freely adjusted. In order to do this, an elliptic arc-shaped projection is formed on both sides of the outer shape of the hanging fitting, centered on the center of the contact area between the swivel support member and the shaft.

[Embodiments of the invention]

An embodiment of the hoisting machine according to the present invention is shown in FIGS. 4 to 10.
This will be explained using figures.

Here 2. FIG. 4 is an enlarged perspective view of a partially opened section of a wire rope end attachment device in a hoisting machine according to an embodiment of the present invention, FIG. 5 is a front view of the hanging fitting, and FIG.
7 is a perspective view of the T-shaped member, FIG. 8 is an explanatory diagram showing the inclination and fallen state of the hanging fitting and socket, Figure 9.10 is an explanatory diagram of the operating state of the hanging fitting when the wire rope is tilted due to load swinging that occurs during use of the first hoisting machine.

The same reference numerals as in FIGS. 1 to 3 indicate the same parts.

In addition, the hoisting machine according to this embodiment has the outer frame described above,
This device is equipped with a wire rope end attachment device which will be described next.

First of all, in Fig. 4, the wire rope terminal attachment device is attached to the support plate 4 related to the two outer frame support members provided on the hoisting-like outer frame 3 shown in Fig. 1.2 described earlier. The shaft 10 is attached, and the hanging fitting 2o is attached so as to span this shaft 1°.
is suspended, and a socket 8 fixed to the end of the wire rope 1 via a socket seat 9 is attached to the hanging fitting 20.

Next, the detailed structure of the hanging fitting 20 will be explained with reference to FIGS. 5 to 7.

The hanging fitting 20 is a steel plate 2 formed by bending it into an inverted U shape.
A flexible T-shaped member 22 is fixed by welding or the like to the inside of the bent part 1, and the concave curved surface 25 provided at the bottom of this T-shaped member 22 is connected to the shaft 10 attached to the previous support plate 4. It is something that locks.

A steel plate 21 is formed by bending the T-shaped member 22 into an inverted U-shape.
By engaging and welding the inner width of the concave curved surface portion 25, the rigidity increases in response to the load applied to the concave curved surface portion 25.
This allows the hanging fitting 20 to have a high safety factor.

In this case, since the T-shaped member 22 slides on the concave curved surface portion 25 and the shaft 10 as the load swings, wear is unavoidable.

As a safety measure, the shaft 10 side is hardened by quenching, and the hanging fitting 20 side is made to wear out to prevent falling accidents.

This is because the width of contact between the worn part of the T-shaped member 22 (FIG. 10) of the T-shaped member 22 of the hanging fitting 20 and the shaft 10 increases significantly, and the progress of wear is stopped.

Further, square windows 21b are formed in the horizontal slopes 21a of the bent steel plates 21 facing each other, and a seat support plate 23 having a hole 26 for attaching and detaching the socket 8 is welded and fixed across the sides.

In addition to this, the outer shape of the bent steel plate 21 is
Notches 27 are provided on both sides so that when the shaft 10 rotates in the axial direction of the shaft 10, it does not hit the lower part of the support plate 4.

In addition, in order to prevent the outer part of the steel plate 21 from coming into contact with the inside of the support plate 4 and become immovable during the angle turning, and rather to make the turning angle smooth, the central part of the concave curved surface part 25 of the T-shaped member 22 is Arc-shaped projecting portions 28 centered at are formed on both sides. Further, rectangular members 2 are provided on both sides of the notch 27.
4 is welded.

Next, the entire operation of the device constructed as described above will be explained.

Figure 8 shows the entire state in which the hanging fitting 20 is tilted and the socket 8 is pushed down to the maximum extent. This is a phenomenon in which the socket 8 collapses when the wire rope 1 becomes slack and is pushed up when the load block lands at a low place.

The reason for this phenomenon is that a gap was created between the lower part of the shaft 10 and the upper part of the socket 8 in order to make the hanging fixture 20 adjustable in the axial direction. It is impossible to prevent the locking metal from collapsing or collapsing the trench.

For this reason, several pieces are fixed on both sides of the rectangular member 24 to prevent the above-mentioned drawbacks. .

Next, FIGS. 9 and 10 show how the above-mentioned hanging fitting 20 follows when the wire rope 3 tilts due to load swinging during transport of the load. This is what is shown.

Generally, the load swing P in the crane traveling direction is I
Although the bending load occurs in a direction perpendicular to Qli 1 o, it is slidable on the circumference of the shaft 10 and on the concave curved surface portion 25 of the T-shaped member 22, and no bending load acts on the wire rope hook root portion 50 of the socket 8.

In addition, the load swing Q in the hoisting mechanism row direction is
occurs in the axial direction, but since the contact width between the shaft 10 and the T-shaped member 22 is kept small, not more than the diameter of the shaft 10,
The outer diameter of the shaft 10 can be used to easily turn the angle.Similarly to the running direction, the wire rope attached to the socket 8 is attached to the root 50.
No bending load acts on it.

When the hanging fitting 20 is turned in the Q direction, the notch 2
7, so it does not hit the lower part of the support plate 4.

Furthermore, since the arc-shaped projecting portion 28 is provided, even if the hanging fitting 20 somehow comes into contact with the inside of the support plate 4, the turning fulcrum and the center of the arc coincide, so that the support It does not get caught on the plate 4 and can be moved without any trouble.

As described above, the wire rope end attachment device of this embodiment has the function of following all load swings during use, and the wire rope end attachment device of socket 8, which is a drawback in the conventional technology, is The bending load on the root 50 can be completely eliminated.

Incidentally, with the hanging fitting 20 of this embodiment, the life of the wire rope support 50 can be made three times or more longer than that of the conventional example.

Furthermore, the hanging fitting 20 of this embodiment has a load swing following function by effectively utilizing the T-shaped member 22, but this function is
This will continue as long as the thickness H (FIG. 10) of the T-shaped part 22 does not disappear due to wear or the like.

Even if the wall thickness H is lost due to wear, the steel plate 21 bent into an inverted U-shape and the remaining base of the T-shaped member 22 will be secured and have a sufficient safety factor in terms of strength. be.

In this respect, the function is significantly improved over the conventional one, and in addition, it has a double safety structure in terms of strength.

Therefore, the arc-shaped protrusion described in the above embodiment can be used in cases where the distance between the support plate and the axial width of the steel plate formed by bending it into an inverted U-shape can be increased. It is not necessary to provide a rectangular member, and it is not necessary to provide a rectangular member, but in cases where the socket is constantly monitored and used with care to ensure that it does not fall too far. It is not necessary to provide this.

〔Effect of the invention〕

As described above, the present invention aims at extending the life of the wire rope,
In addition, as a hanging fitting with improved safety,
It is possible to provide a hoist equipped with a wire rope end attachment device with significantly improved functionality, and it can be said that the invention has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventionally known hoist, and FIG. 2 is a front view of a conventionally known hoist.
FIG. 3 is a perspective view of the wire rope end attachment device, and FIG. 4 is a portion of the wire rope end attachment device in a hoisting machine according to an embodiment of the present invention. FIG. 5 is a front view of the hanging fitting, FIG. 6 is a sectional view taken along line A-A in FIG. 5,
Fig. 7 is a perspective view of the T-shaped member, Fig. 8 is an explanatory diagram showing the inclination and fallen state of the hanging fitting and socket, and Figs. 9 and 10 show the hoisting machine in use. FIG. 3 is an explanatory diagram of the operating state of the hanging fitting when the wire rope is tilted due to load swinging that occurs in the load swing. DESCRIPTION OF SYMBOLS 1...Wire rope, 2...Drum, 3...Outer frame, 4...Support plate, 8...Socket, 9...Socket l-seat, 10...Shaft, 20...・Hanging fittings, 21...
Steel plate, 21a... horizontal slope, 21b... corner window, 22.
... T-shaped member, 23 ... Seat support plate, 24 ... Rectangular part, 25 ... Concave curved surface part, 26 ... Hole, 27 ...
- Notch, 28... arc-shaped protrusion. Agent: Patent attorney Kosaku Fukuda (and 1 other person)] Hikari 2, 10 pages

Claims (1)

[Claims] 1. One end of the wire rope is attached to the drum, the other end of the wire rope is fixed to a socket, and this socket is attached to an outer frame support formed on the outer frame like a hoist. In the product, a shaft is attached to the outer frame support part, and on this shaft,
A support member having a substantially T-shaped cross section and a concave curved surface at the center of the lower part is welded and fixed to the upper part of the bent inner side of the steel plate bent into an inverted T-J shape, and , each having a window, and hanging a hanging bracket which is fixed by welding by passing a seat receiving plate having a removable hole for the socket across both windows, and the seat plate of the hanging fitting. A hoisting machine characterized in that a socket seat is attached to the hoisting machine, and a wire rope terminal attachment device is formed to receive the socket on the socket seat. 2. In the item described in claim 1, each of the opposing steel plate external parts of the upper part of the steel plate bent in an inverted U shape of the hanging fitting is provided with a ring centered at the center of the concave curved surface part of the support member. A hoist that has arc-shaped projections on both sides. 3. In the item described in claim 2, there is a rectangular shape between the seat support plate and the arc-shaped protrusion on the opposing steel plate outer part of the upper part of the steel plate bent in an inverted U shape of the hanging fitting. A hoist that is designed to weld and fix shaped members on both sides.