JPS6365599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire rope end attachment device for supporting the end of a wire rope of a hoisting machine.

[Conventional technology]

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 high places are avoided as much as possible, and the wire rope use limit is often easily determined only by floor inspections.

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 the load falling due to wire rope breakage at this part,
It is necessary to extend the life of the wire rope end portion, that is, to reduce the stress at the wire rope end portion, and to increase the safety factor.

Regarding the wire rope end attachment device that was included in conventional hoisting machines, for example, Japanese Patent Application Laid-Open No. 52-101563
This is shown in Figures 1 and 2.
This will be explained with reference to FIG.

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

That is, one end of the wire rope 1 is attached to the drum 2, and the other end is attached to a hanging fixture 6 on a support plate 4 provided on an outer frame 3 via a shaft 5. and,
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 end attachment device showing the state in which the wire rope 1 is attached to the hanging fitting 6. The socket 8 attached to the end of the wire rope 1 is attached to the hanging fitting 6 via the socket seat 9. It is installed in

The conventional hoisting machine shown in each of these figures is
As shown in the figure, when the load swings due to movement in the traveling direction of the crane, the movement of the load block 7 is as follows:
Roadblocks 7a and 7b indicated by dash-dotted lines
is swung in the direction of

In this case, since the hanging fitting 6 is attached astride the shaft 5, it can follow the inclination of the wire rope 1 when the load swings, and no bending load acts on the wire rope base of the socket 8.

In this conventional device, as shown in Fig. 2, when the load swings due to the movement of the hoist in the lateral direction,
The movement of roadblock 7 is roadblock 7c.
and is swung in the direction of 7d.

In this case, the load swing results in an axial movement of the shaft 5, and the hanging fitting 6 cannot move to follow this movement.

On the other hand, rope end attachment devices disclosed in, for example, Japanese Utility Model Publication No. 37-13833 and Japanese Utility Model Publication No. 47-9220, etc., fit a medium-height cylindrical body in the axial direction to a skewer shaft supported by a winding frame. The rope support can be made to swing freely by engaging the rope support with this cylinder, or by fitting a cylinder (rope support) whose inner periphery is tapered or arcuate on both sides to the skewer shaft. It is said that Therefore,
In these conventional examples, the wire rope end can follow load swings in all directions that occur during load transportation, and almost no bending load is applied to the wire rope end.

[Problem to be solved by the invention]

As mentioned above, the wire rope end attachment method described in JP-A No. 52-101563 has the ability to withstand load swings in one direction (for example, in the crane traveling direction).
The rope end can follow the movement through the hanging fitting, but in other directions (for example, the traverse direction of the hoist)
When the load swings, the movement of the rope end cannot follow, and the bending action is concentrated. For this reason, excessive bending stress is generated at the base of the wire rope, which is a factor that significantly reduces the service life.

In addition, the wire rope end attachment method disclosed in Utility Model Publication No. 37-13833 and Publication No. 47-9220, etc., allows the wire rope end to follow load swing in all directions, and bending load is applied to the wire rope end. However, the fitting structure of the rope support (cylindrical body) and the rope support shaft that fits into it is such that the two contact each other almost in a point or line contact state, so the rope support and rope The load during load swing is concentrated on the contact area with the support shaft. Therefore, this contact portion wears out quickly, and as the high points of the contact wear out due to load swing, the contact width widens greatly. Such a widening of the contact width of the fitting portion becomes a factor that deteriorates the swinging function of the rope support.

The present invention has been made focusing on the above points,
The purpose of this is to prolong the life of the wire rope by following all load swings that occur during load transportation, and to slow down the progress of wear at the contact area between the rope support and rope support shaft, thereby reducing wear. To improve the safety, durability, and functionality of a wire rope end attachment device by maintaining a good load swing following function of a rope support even when the load swing occurs.

[Means to solve the problem]

The above objective is achieved as follows. Hereinafter, in order to facilitate understanding of the contents of the present invention, the fourth
The description will be made by referring to the reference numerals of the embodiments shown in FIGS.

The present invention is constructed by attaching one end of a wire rope 1 to a drum, fixing a socket 8 to the other end of the wire rope, and attaching the socket 8 to an outer frame of a hoist, in which a shaft 10 is attached to the outer frame. On the other hand, a hanging metal fitting (rope support) 20 is formed by bending the steel plate 21 into an inverted U-shape, and a T-shaped wall with a T-shaped cross section and a wall thickness protruding downward is formed inside the bent part of the hanging metal fitting 20. The member 22 is fixed by welding, and this T-shaped member 2
2 interposed between the hanging fittings 20 and the shaft 10, and this engagement involves forming a concave curved surface 25 at the center of the lower part of the T-shaped member 22, and connecting this concave curved surface to the shaft 10. The concave curved surface portion 25 is slidably engaged with the outer periphery of the shaft 10 in a surface contact state, and the axial contact width L of the concave curved surface portion 25 with respect to the shaft 10 is determined by the T-shaped The width dimension is such that the member 22 can perform an angle turning operation on the outer periphery of the shaft 10, and the angle turning movement of this T-shaped member 22 with respect to the shaft 10 and the slidable engagement of the concave curved surface portion 25 with respect to the shaft 10 are provided. Depending on the situation, the hanging fitting 20 is set to be able to swing freely in any direction using the T-shaped member 22 as a fulcrum.
The seat support plate 23 is fixed and stretched over the lower part of the T-shaped member 22, and the socket 8 is attached to the seat support plate 23. Furthermore, the thickness L' of the protruding portion of the T-shaped member 22 is
The wall thickness width is set so that the contact width L of the concave curved surface portion 25 with respect to the shaft 10 can maintain the above-mentioned width dimension that allows the rotation angle even when the concave curved surface portion 25 is worn.

[Effect]

With such a configuration, the concave curved surface portion 25 of the T-shaped member 22 and the shaft 10 are slidably engaged, so that when a force in the radial direction of the shaft 10 is applied to the hanging fitting 20, for example, the T-shaped member 22 is slidably engaged with the shaft 10. The movement of the shaped member 22 around the shaft 10 causes the hanging fitting 20 to swing in the radial direction of the shaft 10. In addition, since the contact width of the concave curved surface portion 25 with respect to the axial direction of the shaft 10 is set in advance to a dimension that allows for angle rotation,
When a force acts on the hanging fitting 20 in the axial direction of the shaft 10,
The hanging fitting 20 swings in the axial direction of the shaft 10 through the rotation of the T-shaped member 22. Furthermore, even when force is applied to the hanging fitting 20 from other directions, the hanging fitting 20
0 can swing in the direction of force application using the T-shaped member 22 as a fulcrum. Therefore, the hanging fitting 20 can follow the load swing in all directions of the wire rope that occurs during load transportation, and the wire rope 1 supported by the hanging fitting 20
No bending load is generated at the end of the load even if the load swings in all directions.

Further, since the concave curved surface portion 25 formed on the protruding portion of the T-shaped member 22 makes surface contact with the outer periphery of the shaft 10 with a contact width that allows angle rotation, the distance between the concave curved surface portion 25 and the outer circumference of the shaft 10 that is affected by rope load swing is The load can be distributed.
Therefore, the degree of wear that occurs on the concave curved surface portion 25 of the T-shaped member 22 over time can be slowed down. Furthermore, even if such wear occurs, the wall thickness L' of the protruding portion of the T-shaped member 22 having the concave curved surface portion 25 is set to the width dimension that allows for the above-mentioned turning angle, so that the concave curved surface portion Even if the contact width of the hanging fitting 25 with the shaft 10 does not widen so much and wear occurs on the concave curved surface portion 25, a good load swing following function of the hanging fitting 20 can be maintained.

〔Example〕

An embodiment of the present invention will be explained with reference to FIGS. 4 to 10.

Here, FIG. 4 is a partially opened perspective view of the wire rope end attachment device in this embodiment, FIG. 5 is a front view thereof, and FIG. 6 is a view taken along line A-A in FIG. A sectional view, FIG. 7 is a perspective view of the T-shaped member, FIG. 8 is an explanatory view showing the inclination and fallen state of the hanging fitting and socket, and FIGS.
FIG. 0 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 hoist. The same reference numerals as in FIGS. 1 to 3 indicate equivalent parts.

As shown in FIG. 4, the wire rope end attachment device of this embodiment has a shaft 10 attached to two outer frame support members (support plates) 4 provided on the outer frame 3 of the hoist.
A hanging fitting 20 is suspended so as to span this shaft 10, and a socket 8 fixed to the end of the wire rope 1 is attached to this hanging fitting 20 via a socket seat 9. The hanging fitting 20 is formed by bending a steel plate 21 into an inverted U-shape, and a T-shaped member 22 serving as a freely connecting member is fixed to the inside of the bent portion of the steel plate 21 by welding or the like. This T-shaped member 22 is a thick, downwardly protruding block with a T-shaped cross section.
A concave curved surface portion 25 is formed at the lower center of the protruding portion. The concave curved surface portion 25 is formed in the length direction of the T-shaped member 22 so that its curvature is smaller than the outer circumference of the shaft 10 . Then, the T-shaped member 22 is attached to the shaft 10.
The hanging fitting 20 straddles the shaft 10 in a state where it intersects with the shaft 10, and the concave curved surface portion 25 engages with the outer periphery of the shaft 10 in a surface contact state. The axial contact width L of the concave curved surface portion 25 with respect to the shaft 10 is such that when a force in the axial direction of the shaft 10 is applied to the hanging fitting 20, the T-shaped member 22 follows this force.
is set to a width dimension that allows for turning angle (tilting) in the axial direction on the outer periphery of the shaft 10. usually,
Since the ratio of the contact width L to the height of the hanging fitting 20 is small, when an axial force is applied to the hanging fitting 20, the T-shaped member 22 easily turns as shown in FIG. The hanging fitting 20 swings using the letter-shaped member as a fulcrum.

Furthermore, the wall thickness L′ of the protruding portion of the T-shaped member 22 is
As shown in FIG. 6, the entire surface is formed to be approximately the same as the contact width L, and even when the concave curved surface portion 25 is worn, the contact width L of the concave curved surface portion 25 after wear is the same as the angle turning movement of the T-shaped member. The wall thickness width is set so that it becomes a width dimension that makes it possible.

By the way, since the T-shaped member 22 slides between the concave curved surface portion 25 and the shaft 10 as the load swings,
Wear is inevitable. As a safety measure, axis 10
If the side is hardened by quenching and the side of the hanging fitting 20 is made to wear out, it will prevent falling accidents. This is because when the wall thickness of the T-shaped member 22 of the hanging fitting 20 gradually wears toward the height H portion (Fig. 10), the contact width with the shaft 10 increases significantly, and the progress of wear is slowed. This is to stop it.

A square window 21b is formed in the lower part of the hanging fitting 20, that is, the lower part of the horizontal slope 21a of the steel plate 21, and a seat plate 2 is provided with a hole 26 for attaching and detaching the socket 8.
3 and welded and fixed.

In addition, the outer shape of the bent steel plate 21 is such that when the hanging fitting 20 is rotated in the axial direction of the shaft 10, the notch 21 is formed so that it does not hit the lower part of the support plate 4.
7 are provided on both sides.

Also, at the time of turning the angle, a steel plate 21 is placed inside the support plate 4.
In order to prevent the outer shape of the T-shaped member 22 from coming into contact with each other and to prevent it from moving, and to make the turning angle smoother, arc-shaped projecting parts 28 are formed on both sides of the T-shaped member 22, centering on the center of the concave curved surface part 25. are doing. Furthermore, rectangular members 24 are welded to both sides of the notch 27. This rectangular member 24 is arranged so as to cross both sides of the opening of the steel plate 21, as shown in FIG.

Next, the operation of this embodiment will be explained.

FIG. 8 shows a state in which the hanging fitting 20 is tilted and the socket 8 is tilted to its maximum extent. For example, when the hoist lands on the floor during transportation,
Alternatively, this is a phenomenon in which the socket 8 collapses, which occurs when the load block lands at a low lifting height and the wire rope 1 becomes slack and is pushed up.

This phenomenon occurs because a gap is created between the lower part of the shaft 10 and the upper part of the socket 8 in order to make the hanging fitting 20 adjustable in the axial direction. cannot prevent locking.

In this embodiment, the rectangular member 24 is
to prevent the above situation from occurring.

Next, FIGS. 9 and 10 show that the load sways during the transportation of the load, and the wire rope 1
This figure shows how the above-mentioned hanging fitting 20 follows when the tilt occurs.

Generally, the new cargo P relative to the crane traveling direction occurs in a direction perpendicular to the axis 10, as shown in FIG. In this case, the T-shaped member 22 swings in the radial direction of the shaft 10 through the engagement between the outer periphery of the shaft 10 and the concave curved surface portion 25 of the T-shaped member 22, and the hanging fitting 2
0 also follows this movement, so no bending load acts on the wire rope base 50 of the socket 8.

In addition, the load swing Q in the horizontal direction of the hoisting machine
10, occurs in the axial direction of the shaft 10, but between the shaft 10 and the T-shaped member 22 (concave curved surface
5) is set to a width dimension that allows the T-shaped member 22 to rotate in the axial direction. Similarly, no bending load acts on the wire rope base 50 of the socket 8. When the hanging fitting 20 is turned in the Q direction, it does not hit the lower part of the support plate 4 because the notch 27 is provided.

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 move without any trouble.

Further, due to the cooperative action of the sliding movement of the concave curved surface portion 25 on the shaft 10 and the angle turning movement, the hanging fitting 20 is moved around the T-shaped member 22.
The shaft 10 can be freely swung in directions other than the axial direction and radial direction using the shaft 10 as a fulcrum.

Therefore, the wire rope end attachment device of this embodiment can follow all load swings during use, and can eliminate any bending load on the wire rope root 50 of the socket 8.

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

Further, the concave curved surface portion 25 of the T-shaped member 22
Since it makes surface contact with the outer periphery of the shaft 10, the load between the concave curved surface portion 25 and the outer periphery of the shaft 10, which is applied due to rope load swing, can be distributed. As a result, the progress of wear occurring on the concave curved surface portion 25 can be slowed down.

Furthermore, even if such wear occurs, the T-shaped member 2
Since the wall thickness L' of the protruding portion 2 is set to a width dimension that allows for angle rotation, the contact width of the concave curved surface portion 25 with the shaft 10 after wear is also maintained within the allowable angle rotation width. As a result, the load swing tracking function of the hanging fitting 20 of this embodiment is determined by the height H of the wall thickness of the T-shaped member 22 (FIG. 10).
This will continue unless it disappears due to wear, etc. In the unlikely event that
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 are secured, providing a sufficient safety factor in terms of strength. In this respect, the function has been significantly improved over the conventional one, and in addition, it exhibits a double safety structure in terms of strength.

Note that the arc-shaped protrusion described in the above example is
If 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 this. Also,
The rectangular member does not necessarily have to be provided, but may be omitted if the socket is constantly monitored and used with care to prevent it from falling too far.

〔Effect of the invention〕

As described above, according to the present invention, rope support (hanging fittings) is used to prevent all load swings that occur during load transportation.
follows, prolonging the life of the wire rope, and also slowing down the progress of wear at the contact area between the rope support and the rope support shaft, and maintaining the good load swing following function of the rope support even when wear occurs. , the safety, durability and functionality of the wire rope end attachment device can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view of a conventionally known hoisting machine, FIG. 2 is a side view thereof as seen from direction A in FIG. 1, and FIG.
The figure is a perspective view of the wire rope end attachment device, FIG. 4 is a partially opened enlarged perspective view of a wire rope end attachment device according to an embodiment of the present invention, and FIG.
The front view of the hanging fitting, Figure 6, is A-A in Figure 5.
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, FIG. 9,
FIG. 10 is an explanatory diagram of the operating state of the hanging fitting when the wire rope is tilted due to load swing that occurs during use of the hoist. DESCRIPTION OF SYMBOLS 1...Wire rope, 2...Drum, 3...Outer frame, 4...Support plate, 8...Socket, 9...Socket seat, 10...Shaft, 20...Hanging fitting, 21...
Steel plate, 21a... Horizontal slope, 21b... Corner window, 22
... T-shaped member, 23 ... Seat support plate, 24 ... Rectangular member, 25 ... Concave curved surface part, 26 ... Hole, 27
... Notch, 28 ... Arc-shaped protrusion.

Claims (1)

[Scope of Claims] 1. One end of a wire rope is attached to a drum, a socket is fixed to the other end of the wire rope, and this socket is attached to a part of an outer frame of a hoist, wherein the outer frame Attach the shaft to a part of the
A thick, downwardly protruding T-shaped member with a T-shaped cross section is welded and fixed to the inside of the bent part of the hanging fitting formed by bending a steel plate into an inverted U-shape, and this T-shaped member is interposed. The hanging fitting is engaged in a state spanning the shaft, and this engagement is achieved by forming a concave curved surface at the center of the lower part of the T-shaped member, and bringing this concave curved surface into surface contact with the outer periphery of the shaft. The axial contact width of this concave curved surface portion with respect to the shaft is such that when an axial force is applied to the hanging fitting, the T-shaped member is slidably engaged with the shaft. The width of the T-shaped member is set to allow an angle rotation operation in the axial direction, and the angle rotation operation of the T-shaped member with respect to the shaft and the slidable engagement of the concave curved surface portion with the shaft allow the hanging fitting to be rotated. is set so that it can swing freely in any direction using the T-shaped member as a fulcrum, a seat support plate is fixed and spanned over the lower part of the hanging fitting, the socket is attached to this seat support plate, and the T-shaped member is The wall thickness of the protruding portion of the character-shaped member is such that even when the concave curved surface portion is worn,
A wire rope end attachment device for a hoisting machine, characterized in that the wall thickness width of the concave curved surface portion is set so that the contact width with respect to the shaft can maintain the width dimension that allows for the angle rotation. 2. In what is stated in claim 1,
The hanging fitting has an arc-shaped projection centered on the center of the concave curved surface of the T-shaped member on both sides of the upper outer shape of the steel plate bent into an inverted U-shape. Wire rope end attachment device. 3. In the item described in claim 1 or 2, the hanging fitting has a rectangular frame for preventing the socket from popping out, extending across both sides of the opening of the steel plate bent into an inverted U-shape. A wire rope end attachment device for a hoist that is fixed by welding.