JPH0250040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hoisting machine such as a wire rope hoist, and a hoisting machine having a wire rope end attachment structure for supporting an end of the wire rope. It's about machines.

[Background of the invention]

Regarding wire rope terminal devices equipped in conventional hoisting machines, for example, Japanese Patent Publication No. 52-101563
This will be explained with reference to FIGS. 6 to 8.

First, FIG. 6 is a front view of the hoist, and FIG. 7 is a side view of the hoist as seen from direction A in FIG.

That is, one end of the wire rope 1 is wound around the drum 2, and the other end is wound around the support plate 4 provided on the outer frame 3.
It is attached to the hanging fitting 6 via the shaft 5.

And the road block 7 that lifts the load,
It is suspended by a wire rope 1 via a load sheave.

Here, the term "load sheave" refers to a pulley for winding a wire rope, which is housed within the road block.

FIG. 8 shows a wire rope 1 attached to the hanging fitting 6.
1 is a perspective view of the wire rope end attachment device showing a state in which the wire rope end attachment device is attached. A socket 8 attached to the end of the wire rope 1 is attached to a hanging fitting 6 via a socket seat 9.

The conventional hoisting machine shown in each of these figures is
As shown in the figure, the crane moves in the direction shown by the dashed line, that is, load block 7.
It is swung in the directions of a and 7b.

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

However, as shown in FIG. 7, when the load swings due to the movement of the hoist in the transverse direction, the movement of the load block 7 swings in the direction of the load blocks 7c and 7d. In this case, since the movement is in the longitudinal direction of the shaft 5, the hanging fitting 6 cannot be rotated.

Therefore, when the wire rope 1 is tilted due to lateral load swing, the bending action is concentrated at the base of the wire rope in the socket 8 portion.

For this reason, excessive bending stress is generated at the base of the wire rope, which, depending on the manner in which it is used, can be a factor that reduces the service life of the wire rope.

As described above, the configuration of the wire rope end attachment device included in the conventional hoisting machine has a drawback in that it may shorten the life of the wire rope in terms of its ability to follow load swings.

[Purpose of the invention]

The present invention has focused on the above-mentioned drawbacks, and includes a wire rope end attachment device with a high strength and safety factor that can follow all load swing directions that occur during load transportation. The object of the present invention is to provide a hoisting machine that prevents bending loads from acting on the wire rope parts, extends the life of the wire rope, and improves safety.

[Summary of the invention]

The structure of the hoisting machine according to the present invention is such that a wire rope is wound up by a drum, the end of the wire rope on the opposite side to the winding side is fixed to a socket and held, and the load is moved up and down through a load block. In a hoisting machine with multiple wire ropes,
The wire rope end is fixed to the socket by winding it around a support member having a radius greater than the radius of the load sheave. Further details are as follows.

The structure of the hoist according to the present invention is such that one end of the wire rope is wound around a drum, the other end of the wire rope is fixed to a socket, and the socket is attached to a support part formed on the main frame of the hoist. The socket is fixed to the end of a wire rope that is wound about 1/4 or more around a support member having a radius equal to or greater than the radius of the load sheave, and the support member is Furthermore, the above-mentioned drawbacks are improved by attaching the drum via a shaft so as to be rotatable in the longitudinal direction of the drum so as to be able to follow the swinging of the load in the transverse direction.

Further details are as follows.

When bending force is applied to the base of the socket,
Although it is obvious that this will lead to a reduction in the lifespan, in the present invention, the socket support structure is formed in the tangential direction to the radius portion formed on the support member, so that no bending force is applied to the root portion. It is something.

In addition, regarding wire rope breakage, which can be said to be another life mode, the winding diameter Dφ of the drum or load sheave around which the wire rope is wound is usually of the same diameter, and the wire rope thickness dφ. Ratio (D/
d).

Generally, in the case of hoists, D/d≧20 is legislated to ensure safety.

Therefore, when fixing to the fixed end of a wire rope via a sheave-like support member, the purpose cannot be achieved unless the ratio D/d is greater than or equal to the ratio D/d of the load sheave. Yes, it will be difficult.

In addition, when securing the wire rope after winding it around a sheave-shaped support member, the winding range (1/4
The larger the circumference (circumference, 1/2 circumference, 1st turn, 2nd turn, etc.), the lower the tensile stress of the wire rope at the base of the socket due to friction loss during winding, but the bending angle of the wire rope is large (because the amount of deformation is large), the strength of the wire rope itself becomes weak, which is undesirable, and it can be said that it is preferable to keep it to the necessary minimum.

Based on this idea, in the present invention, the winding is approximately 1/4 turn.

This is because if the winding range is too small, bending force will be applied to the root portion, and from the structural point of view, it is thought that around 1/4 of the circumference is better.

Furthermore, when it is wound around a sheave-shaped support member, it forms a circular contact relationship, and when the rope swings in the direction of the groove,
It is obvious that it is difficult to damage the wire rope. However, when swinging in a direction that rises from the rope groove, the wire rope is likely to be damaged due to the rising action, so in the present invention, the entire support member is further configured to be able to swing in this direction. It is something that exists. This direction is the transverse direction, and can be said to be the direction in which the load swings the most when using a hoist (most hoists are equipped with a transverse trolley, but cranes are used in only a few 10% of cases). be.).

[Embodiments of the invention]

Embodiments of the hoisting machine according to the present invention will be described with reference to FIGS. 1 to 5.

Here, FIG. 1 is a schematic exploded perspective view of a wire rope hoist according to an embodiment of the present invention, FIG. 2 is a cross-sectional front view of the main part thereof, and A of FIG. 3 is an enlarged view of the supporting member. 4 and 5 are perspective views of the support member.

In the figure, 1 is the wire rope, 8 is the socket, and 10 is the wire rope.
is the main frame of the hoist, 11 is a drum for winding wire rope, 12 and 12' are hanging parts, 13 is shaft A,
14 is a hole, 15 is a cover plate, 16 is a support metal fitting, 17 is a shaft B, 18 is a support member, 19 is a socket locking part,
20 is a rope groove, 21 is a hole, and 22 is a rotation stopper.

Therefore, the main frame 10 and the hanging part 1 of the above-mentioned hoist
2, 12', etc. form the frame of the hoist.

Further, this embodiment is of a type in which multiple ropes are hung.

That is, the main frame 10 is provided with hanging parts 12 and 12' that support the fixed end side of the wire rope 1.

A hole 1 for supporting the shaft A13 is provided in the part of the main frame 10 located at the center between the hanging parts 12 and 12'.
4, and the other end of the shaft A13 is supported by a cover plate 15.

Further, a support fitting 16 is rotatably inserted through the shaft A13, and a shaft B17 is inserted into the lower end of the support fitting 16 in a direction perpendicular to the insertion direction of the shaft A13. A support member 18 is attached to this shaft B17.

As mentioned above, 8 indicates a socket, and the wire rope 1 is wound around the support member 18 for about 1/4 turn, and is fixed by hooking the socket 8 using a commonly used neck hanging method. .

The shape of this support member 18 is as shown in FIGS. 3 to 5.

That is, the shape of the portion around which the wire rope 1 is wound has a rounded radius R1 to cope with the swinging of the wire rope 1 in the left and right directions as shown in FIG. The winding diameter Dφ of the guide member, the drum or load sheave around which the wire rope is wound, and the thickness of the wire rope as explained earlier.
(D/d), which is the ratio of
The guide portion 2 is provided with a socket locking portion 19 for accommodating and fixing the socket 8 in the tangential direction of the upper horizontal portion.

The portion around which the wire rope 1 is wound has a rope groove 20 formed therein, similar to a load sheave, and the center portion of the radius R1 has a rope groove 20 formed therein for the shaft B17 to pass through. A hole 21 is formed therein.

As mentioned above, the support member 18 is shown in FIGS. 4 and 5.
As shown in the figure, these are formed with a rotation stopper 22 for locking rotation when a load is applied, and are locked by abutting against the support fitting 16. .

According to this embodiment, the strength of the fixed portion of the wire rope 1 is such that the strength of the fixed portion of the wire rope 1 is determined by the support at the axis A13 against a load in the transverse direction (the front-rear direction toward the drawing in FIG. 2, that is, the direction perpendicular to the plane of the paper). By rotating the metal fitting 16, the application of bending force to the wire rope 1 is avoided.

In addition, with respect to the moving direction of the hoist (left and right direction when facing the diagram in FIG. 2), the rounded portions of the support member 18 with radii R1 and R2 contact in a circular shape, that is,
The wire rope is supported with better strength conditions than those required for winding around the load sheave and drum 11, and the horizontal guidance to the socket 8 makes it possible to avoid bending stress at the base of the wire rope. It is designed to achieve its intended purpose.

Although the above embodiments relate to wire rope hoists, the present invention also relates to general-purpose hoisting machines including cranes, winches, and the like.

〔Effect of the invention〕

According to the present invention, the tensile strength and rocking resistance of the wire rope end portion on the anti-winding side are improved,
Since the winding strength on the load sheave or drum can be maintained at a strength that exceeds the life span, it is possible to maintain the strength of the wire rope near the load block on the floor without inspecting the end of the wire rope, which is difficult to inspect because it is on the ceiling. This invention has a remarkable effect in that it is possible to know whether the wire rope has reached the end of its life by checking the condition of the wire, and can be said to be a highly practical invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic exploded perspective view of a wire rope hoist according to an embodiment of the present invention, FIG. 2 is a sectional front view of a main part thereof, and A in FIG. 3 is an enlarged sectional view of a supporting member thereof. 4 and 5 are perspective views of the supporting member, and 6 and 7 are diagrams explaining the swinging state of the wire rope. is a front view of a conventional hoisting machine, No. 7
This figure is a side view seen from direction A in FIG. 6, and FIG. 8 is a perspective view of a wire rope terminal device showing a conventional method for supporting the wire rope end portion. 1...wire rope, 7...roadblock,
8...Socket, 9...Socket seat, 10...Main frame, 11...Drum, 12, 12'...Hanging part, 1
3... Axis A, 14... Hole, 15... Lid plate, 16...
...Supporting metal fitting, 17... Axis B, 18... Supporting member,
19...Socket locking part, 20...Rope groove, 2
1...hole, 22...rotation stopper.

Claims (1)

[Claims] 1. A wire rope is wound up by a drum, and the end of the wire rope on the opposite side to the winding side is fixed to a socket to hold it, and the load is moved up and down via a load block. A winding machine for hanging multiple wire ropes, characterized in that the end of the wire rope is fixed to the socket through winding around a support member having a radius equal to or larger than the radius of the load sheave. A hoisting machine. 2. In what is stated in claim 1,
In the support member, the wire rope should be wound;
The portion having a radius equal to or greater than the radius of the load sheave is approximately 1/4 of the circumference, and a socket is fixed to the end of the wire rope wound around the wire rope, which extends tangentially in the horizontal direction to the support member. Hoisting machine. 3 In what is stated in claim 1,
Attach the support member so that the wire rope is wound in a direction perpendicular to the longitudinal direction of the drum, and rotate the support member in the direction in which the hoist traverses (usually in the longitudinal direction of the hoist main body) A hoist is a hoist that is attached to a support fitting provided on the frame of the hoist.