JPH07137991A - Wire rope hoisting device - Google Patents

Abstract

PURPOSE:To prolong the service life of a wire rope by preventing the wire rope from being derailed from a sheave and damaged and also preventing a limit switch from erroneously acting. CONSTITUTION:A drum 8 is installed on the upper side of a trolley 6, a sheave mounting stand 14 is installed on the under side of the trolley 6, and direction converting sheaves 10a and 10b are installed on the sheave mounting stand 14. Also a sheave bracket 15 is installed on the sheave mounting stand 14, and a guide roller 16 is installed on the sheave bracket 15. This guide roller 16 has a clearance which is faced in the direction perpendicular to the sheave shaft and not interfered with a wire rope, and holds the wire rope 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rope hoisting device such as a crane, and more particularly, to a wire rope having a long life and preventing the wheel from coming off from a direction-changing sheave and preventing malfunction of a limit switch. Winding device.

[0002]

2. Description of the Related Art A conventional wire rope hoisting device for an overhead crane will be described. 2 to 3 show a conventional overhead crane. In this overhead crane 1, as shown in FIG. 2, a pair of two crane body girders 3 are connected by saddles 4 on both sides, and a crane body girder 3, 5 is integrally configured. A trolley 6 is movably laid on the crane main body girder 3, and a hook 7 is hung from the trolley 6 so as to be vertically movable.

On the other hand, when the equipment arranging area inside the building 2 is very narrow and the hook 7 cannot approach the wall surface of the building 2, the wire rope 9 hanging from the drum 8 is shown in detail in FIG. Is firmly fixed to the lower surface of the trolley 6 and is bent in the opposite direction through the rope grooves of the direction change sheaves 10a, 10b, and the wire rope 9 is changed in direction and hung down to the hook 7 to the wall surface of the building 2. The structure is such that it can be approached and the operating range of the hook 7 can be expanded.

Also, due to excessive winding, the rope socket
In order to avoid interference between 13 and the lower surface of the trolley 6, a ring-shaped linear motion type limit switch weight 12 is provided at the upper limit position of the rope socket 13 with the wire rope 9 passing through it.
When the rope socket 13 is hoisted from the upper limit position, the rope socket 13
By pushing up, the limit switch is activated and the hoisting operation of the hook 7 is stopped.

[0005]

In the above-mentioned conventional example, the equipment placement area is extremely narrowed by the suspended load suspended in the building 2, and for example, a long suspended load is rotated by the direction change sheaves 10a, 10b. There is a unavoidable situation where they must be arranged in the axial direction. Therefore, in the vertical raising work of the suspended load,
An unillustrated winding motor and speed reducer are operated to rotate the drum 8 so that the hook 7 rises.

However, the hook 7 changes the direction of the sheave.
Since the wire ropes 9 are laterally pulled in the direction of the rotation axes of the wires 10a and 10b, the wire rope 9 may be derailed from the direction-changing sheave 10b, that is, it may come off and drop a suspended load, which is a very dangerous drawback.

Therefore, the wire rope 9 is a sheave for changing direction.
It is possible to provide various kinds of stopper fittings for preventing the stoppers from coming off from 10b, however, since the wire rope 9 is raised or lowered while being in contact with the stopper fittings,
There is a problem that the wire rope 9 is significantly damaged and the service life of the wire rope 9 is extremely shortened.

On the other hand, the weight for the direct acting type limit switch
Since 12 is suspended from the limit switch with 91 wires, it can not be kept horizontal, so it is a weight for direct-acting limit switch.
The wire rope 9 passing through 12 is always in contact with the inner surface of the through hole of the direct acting type limit switch weight 12. Therefore, there is a problem that the contact portion of the wire rope 9 is significantly damaged due to the rising or lowering of the wire rope 9 and the service life of the wire rope 9 is extremely shortened.

Further, when the wire rope 9 is lifted, the weight 12 for the direct-acting type limit switch is caught on the wire rope 9, so that the weight 12 for the direct-acting type limit switch is obtained.
Is lifted and the limit switch malfunctions to stop the hoisting of the hook 7.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to prolong the life of the wire rope, prevent the wheel from deviating from the direction-changing sheave, and prevent malfunction of the limit switch. Another object of the present invention is to provide a wire rope winding device.

[0011]

According to the present invention, a drum around which a wire rope having a hook is wound is installed on a trolley, a sheave mount is provided under the trolley, and a direction-changing sheave is attached to the sheave mount. In a wire rope winding device for rotating the drum, winding the wire rope through the sheave, and feeding the wire rope, a sheave bracket is provided at a wire rope outlet portion under the trolley, and the sheave bracket is provided with the sheave bracket. It is characterized in that a pair of rotary guide rollers are provided so as to hold the wire rope in a direction orthogonal to the axis of the sheave provided on the mounting base and with a gap that does not interfere with the wire rope. .

According to the present invention, a drum around which a wire rope having a hook is wound is installed on a trolley, a sheave mounting base is provided under the trolley, and a direction changing sheave is installed on the sheave mounting base. In the wire rope winding device for rotating the wire rope to wind the wire rope through the sheave and feeding the wire rope, a sheave bracket is provided at the wire outlet portion under the trolley, and the sheave bracket is provided on the sheave mount. A guide roller is provided so as to sandwich the wire rope in a direction orthogonal to the axis of the sheave and does not interfere with the wire rope, and a limit switch weight is suspended from the sheave mount and the sheave bracket. It is characterized by being done.

[0013]

By installing a pair of guide rollers at the wire rope outlet on the lower surface of the trolley, the wire rope can be smoothly retracted in the rotating direction of the direction-changing sheave even if the wire rope is laterally pulled. Therefore, the wire rope does not come off from the sheave, and the wire rope can be safely wound up.

Further, by suspending the direct-acting type limit switch weight from one point to four points, interference with the wire rope is eliminated, malfunction of the limit switch can be prevented, and the life of the wire rope can be extended.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wire rope winding device according to the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in FIG. 3 are designated by the same reference numerals.

That is, in FIG. 1, reference numeral 6 is a trolley, and a drum 8 for winding a wire rope 9 on the trolley 6.
Is firmly mounted on the trolley 6, and the wire rope 9 is hung below the trolley 6 so as to be vertically movable. A sheave mount 14 is installed on the lower surface of the trolley 6, and the direction changing sheaves 10a and 10b are mounted on the sheave mount 14.

A guide roller 16 is provided on the sheave bracket 15 at the wire rope outlet of the lower part of the trolley 6 to change the direction of the sheave 10b.
The wire ropes 9 are provided so as to face each other so as to sandwich the wire ropes 9 at intervals so as not to interfere with the wire ropes 9 in the direction orthogonal to the axis 10c. The guide rollers 16 rotate in contact with the wire rope 9 and guide it, and a pair of guide rollers 16 are provided.

The weight 12 for the direct acting type limit switch is
Two wires 11a connected to the sheave mounts 14 installed on both sides of the direction changing sheave 10b under the trolley 6,
And the wire 11b connected to the limit switch is 2
A total of four wires 11a and 11b are used to hang four points horizontally.

On the other hand, the wire rope 9 is hung from the drum 8 and hung on the direction change sheaves 10a and 10b, passes between the guide rollers 16 and penetrates the direct-acting type limit switch weight 12 to hook the hook 7 onto the rope sheave. It is hanging on 10b.

Next, the operation of the present invention will be described. When hoisting a suspended load of a long object arranged in the direction of the rotation axis of the direction changing sheaves 10a, 10b using a crane, first, the trolley 6
Is moved to the vicinity of the position of the center of gravity of the suspended load, and the winding motor and speed reducer (not shown) are operated to rotate the drum 8 in the downward direction to unload the hook 7 to the proximity of the suspended load. Then, a hanging load is hung on the hook 7 by using a sling wire rope or the like, and a hoisting electric motor or a speed reducer (not shown) is operated to rotate the drum 8 so that the hook goes down.

When the wire rope 9 is pulled laterally in the direction of the rotating shafts of the direction changing sheaves 10a and 10b during the winding operation, the wire rope 9 comes into contact with the guide roller 16, but the guide roller 16 is a rotary type. Since the hook 7 is not pulled laterally in the direction of the rotation axis of the direction changing sheave 10b, and the wire rope 9 is smoothly drawn in the rotation direction of the direction changing sheave 10b, the wire rope 9 is moved to the rope sheave 10b.
It is safe because it prevents you from taking off the bicycle.

When the hook 7 is to be wound up above the upper limit position of the hook, the rope socket 13 of the hook 7 lifts the weight 12 for the direct-acting type limit switch, and the wire 11b is slackened to cause a limit (not shown). Since the switch is actuated to stop the hoisting operation of the hook 7, it is possible to prevent interference between the hook socket 13 and the lower portion of the trolley 6 for safety.

In the above embodiment, the direction changing sheave 10 is used.
Although an example of lifting a long object arranged in the rotation axis direction of a, 10b is shown, the direction change is performed for lifting the long object arranged in the direction orthogonal to the rotation axis of the direction change sheaves 10a, 10b. A guide roller 16 may be provided in the rotation axis direction of the sheaves 10a and 10b.

The direct acting type limit switch 12 is a wire.
Although an example in which four wires are hung by 11a and 11b is shown, either one of the wire 11a from the sheave mount or the wire 11b from the limit switch may be reduced and a total of three wires may be hung. In this case, the direct-acting limit switch weight 12 is kept horizontal, and the wire 9 does not contact the inner surface of the through hole of the direct-acting limit switch weight 12.

[0025]

According to the present invention, it is possible to prevent the wire rope from slipping off the sheave and safely perform the hoisting operation. Further, since there is no interference of the wire rope, malfunction of the limit switch can be prevented, and the life of the wire rope can be extended.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a wire rope winding device according to the present invention.

FIG. 2 is a conceptual diagram showing an installation state of a conventional wire rope winding device.

FIG. 3 is a side view showing a conventional wire rope winding device.

[Explanation of symbols]

1 ... Overhead crane, 2 ... Building, 3 ... Crane body girder, 4 ... Saddle, 5 ... Crane body girder, 6 ... Trolley, 7 ... Hook, 8 ... Drum, 9 ... Wire rope, 10
a, 10b ... Direction changing sheave, 11a, 11b ... Wire, 12 Direct acting type limit switch weight, 13 ... Rope socket, 14 ... Sheave mount, 15 ... Sheave bracket, 16 ...
Guide roller.

Claims (2)

[Claims] 1. A drum around which a wire rope having a hook is wound is installed on a trolley, a sheave mount is provided under the trolley, a direction changing sheave is provided on the sheave mount, and the drum is rotated. In the wire rope winding device for winding and unwinding the wire rope through the sheave, the sheave bracket is provided at the wire rope outlet portion under the trolley, and the sheave bracket is provided on the sheave mount. And a pair of rotary guide rollers for holding the wire rope in a direction orthogonal to the axis of the wire rope with a gap that does not interfere with the wire rope. 2. A drum around which a wire rope having a hook is wound is installed on a trolley, a sheave mount is provided under the trolley, a direction changing sheave is provided on the sheave mount, and the drum is rotated. In the wire rope winding device that winds the wire rope through the sheave and pays it out, a sheave bracket is provided at the wire outlet portion under the trolley, and the sheave bracket is provided with the sheave bracket. A guide roller is provided so as to sandwich the wire rope in a direction orthogonal to the axis and which does not interfere with the wire rope, and a limit switch weight is hung from the sheave mount and the sheave bracket. A wire rope hoisting device characterized in that