JPS623752B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crane rope end support device, and more particularly to a crane rope end support device for a crane having a trolley.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A crane rope end support device conventionally used in a crane having a trolley, such as a container crane or a rubber tire crane, will be explained with reference to FIGS. 1 to 4. Figure 1 shows the application state of the crane rope, a is a plan view, b is a front view, 1 is a trolley frame equipped with a rope winding device on the upper part, 2 is a drum, and 3 is unwound from the drum 2. A crane rope, 4 is a trolley sheave, 5 is a lifting device fixedly provided with a lifting sheave 6, 7 is an end portion of the crane rope 3, and the crane rope 3 is fed out from the drum 2 attached to the trolley frame 1. The terminal portion 7 is supported again at a position on the lower surface of the trolley frame 1 via a hanging sheave 6 provided on the trolley frame 1.

Figure 2 shows a conventional example in which the terminal section 7 is simply supported directly on the trolley frame 1, where a is a side view and b is a side view.
is a front view, and in this terminal support means,
Currently, it is not used except in special cases because it is easy to cause problems due to swinging of the crane rope 3.

Figure 3 shows a currently used crane rope terminal support device, in which a is a top plan view, b is an elevational view with a partial section, c is a side view, 8 is a rope clip, and 9 is a collar. 11 is a bracket of the trolley frame 1, 12 is a spherical thrust bearing, and 13 is provided in the middle of the fork bolt 10. A nut for adjusting the mounting position of the spherical thrust bearing 12.
15 is a lock nut, and 15 is a stopper whose one end is fixed to the upper end of the fork bolt and whose other end is engaged and supported in the elongated hole of the guide 16.

That is, the end portion 7 of the crane rope 3 that moves the lifting tool 5 up and down via the sheave 6 fixed to the lifting tool 5 by the rope winding device on the upper part of the trolley frame 1 is a spherical surface supported by the bracket 11 of the trolley frame 1. A guide 16 is attached to the lower end of a fork bolt 10 with a thrust bearing 12 in the middle, and has one end fixed to the upper end of the fork bolt 10 and the other end fixed to the bracket 11. This structure includes a stopper 15 that is inserted into a long hole.

Figure 4 is an explanatory diagram of the operation when the crane is operated in this structure, where a is a top plan view, b is an elevation view, and c is a top view showing the operating state in figure a with chain lines. When a tension P is applied to the crane rope 3 due to the operation of hoisting a load using the hoisting tool 5, a rotational torque T _R is generated in the direction of untwisting the crane rope 3, and the other end of the stopper 15 is connected to the elongated hole of the guide 16. The untwisting action of the crane rope 3 is prevented by contacting the side surface. When the suspended load swings in the direction A in this state, the fork bolt 10 causes a pendulum movement around the rotation center point C of the spherical thrust bearing 12 due to the horizontal force P _H caused by this swing, causing the stopper 15 to move in the direction shown in c. As shown, there is a problem in that the bending action works and the support function of the crane rope 3 is deteriorated due to bending of the stopper 15 or damage to the attachment portion to the fork bolt 10.

The purpose of the present invention is to solve the above-mentioned difficulties and to provide a system that does not impede the support function of the crane rope 3.
The purpose of the present invention is to provide a crane rope support device.

In the present invention, a fork bolt is installed vertically via a spherical thrust bearing installed on a trolley frame, an end of a crane rope for raising and lowering a hanging device is fixed to the lower end of the fork bolt, and the above-mentioned In a crane rope end support device in which one end of a stopper projecting horizontally is fixed to a fork bolt and the other end of the stopper is inserted into a hole in a guide installed in the trolley frame, rotation of the spherical thrust bearing is provided. A rotation center of the guide is provided horizontally at the same height as the center and below the stopper, and the guide is rotated by being pushed by the stopper. It is characterized by being fixed.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 5 shows an embodiment of the crane rope support device of the present invention, in which a is a top plan view, b is an elevation view, c is a side view, and FIG. In the action explanatory diagram, a is a top plan view, b
1 is an elevational view, and c is a side view, and the same parts or parts that act in the same manner as in FIGS. 1 to 4 are given the same reference numerals. And, conventional figures 1 to 4
The difference from the crane rope end support device shown in the figure is that the guide 18 has a spherical thrust bearing 12.
The support shaft 21 is located at the same height as the rotation center point C of the fork bolt 10, and is provided to swing following the movement of the fork bolt 10.

That is, the guide 18, which has a long hole into which the other end of the stopper 15 is inserted and engaged and supported, swings in the same direction and at the same angle as the fork bolt 10 swings about the rotation center point C of the spherical thrust bearing 12. A support shaft 21 is provided so as to be able to follow the
The guide 18 is fixed by a collar 22, a washer 23, a nut 24, and a lock nut 25 so that it can swing smoothly.

Therefore, unreasonable stress is generated in the stopper 15 due to the rotational torque T _R when tension P is applied to the crane rope 3, and the horizontal force P _H when the suspended load swings in the A direction. It is something that never happens.

That is, the rotation of the fork bolt 10 is prevented in the same way as described above with respect to the rotational torque TR. In addition, when the suspended load swings, the guide 18 moves to the stopper 1.
It rotates with 5. The same applies if the suspended load swings in the opposite direction. Therefore, the stopper 15 does not bend. In this case, since the support shaft 21, which is the rotation center of the guide 18, is located at the rotation center C of the spherical thrust bearing 12, which is the rotation center of the stopper 15, there is no relative movement between the guide 18 and the stopper 15 from this point. Also, bending of the stopper 15 can be prevented.

Therefore, bending of the stopper 15 and damage to the attachment portion to the fork bolt 10 can be prevented.

As explained above, according to the crane rope terminal support device of the present invention, the terminal support function of the crane rope can be maintained for a long period of time, so it has a practical effect that good crane operation can be maintained permanently. can be played.

[Brief explanation of the drawing]

Figure 1 is a diagram of the conventional Keren rope.
a is a plan view, b is an elevation view, Fig. 2 a is a view taken along the line A-A shown in Fig. 1 b, Fig. 2 b is a side view of Fig. 2 a, and Fig. 3 is another conventional view. FIG. 4 is a diagram showing an example rope end support device, in which a is a top view, b is an elevation view with a partial cross section, c is a side view, and FIG. 4 is an operation of the rope end support device shown in FIG. 3. FIG. 5 is a diagram showing the state, in which a is a top view, b is an elevational view, c is a schematic top view showing the state at the time of abnormal operation with chain lines, and FIG. 5 is a rope end support device according to an embodiment of the present invention. FIG. 6 is a top view including a partial cross-sectional view, b is an elevation view including a partial cross-sectional view, c is a side view including a partial cross-sectional view, and FIG. 6 is shown in FIG. FIG. 3 is a diagram showing the operating state of the device, in which a is a top view including a partial cross-section, b is an elevation view, and c is a side view including a partial cross-section. 1... Trolley frame, 3... Crane rope, 5... Hanging tool, 10... Fork bolt, 12
... Spherical thrust bearing, 15 ... Stopper, 1
6,18...Guide.

Claims (1)

[Claims] 1. A fork bolt is vertically installed via a spherical thrust bearing installed on the trolley frame, and the end of a crane rope for raising and lowering a hanging device is fixed to the lower end of the fork bolt, and In the crane rope end support device, one end of a horizontally protruding stopper is fixed to the upper fork bolt, and the other end of the stopper is inserted into a hole in a guide installed in the trolley frame, wherein the spherical thrust bearing The center of rotation of the guide is provided in the horizontal direction at the same height as the center of rotation of the guide and below the stopper, and the guide is centered on the center of rotation so as to be pushed by the stopper and rotated. A crane rope terminal support device, characterized in that it is fixed.