JPH09104585A - Automatic hook release preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a hook release preventing mechanism of an automatic hook release preventing device and facilitate operation in the time of driving device failure. SOLUTION: A pneumatic cylinder 3 provided at the neck part of a hook body 1 and one end of a hook release preventing member 4 rotatingly attached the other end to the hook body 1 are connected with a wire 5 and the hook release preventing member 4 is vertically moved by the pneumatic cylinder 3 to make an opening part of the hook body 1 as an open and close mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a hook from coming off an overhead crane or the like,
More specifically, the present invention relates to an automatic hook detachment prevention device that can automatically close and open the opening of a hook body by using a fluid pressure cylinder or an electric cylinder.

[0002]

2. Description of the Related Art As a device for preventing a hook from coming off an overhead crane or the like, for example, as shown in FIG. 3, a hook body 11 is pivoted in the left-right direction above an opening of a hook body 11 which is curved like a hook. Supporting part 12 that can be provided
A mechanism for rotatably mounting an arm 13 for closing and opening the opening, and pressing a base of the arm from above with a holding member 14 mounted on the support 12 to close the hook opening. In addition, there is proposed a hook with a detent device which is provided by engaging a cam mechanism 15 for stopping the supporting portion 12 in a state of rotating the supporting portion 12 in the left-right direction (actually 62-92278). (See the official gazette).

Further, as shown in FIG. 4, a hook drive mechanism 2 for flipping up and rotating a hook body 21 which is curved like a hook.
2 and a wire disengagement prevention member 23 for closing and opening the opening of the hook main body at the neck of the hook main body 21,
An interlocking mechanism (gear) 24 for moving this member to the hook opening position in association with the flip-up rotation of the hook body,
One end is pivotally attached to the tip of the hook body and the other end is connected to the wire disengagement prevention member 23. For removing the wire, the sling wire in the hook hook portion is pushed outward in conjunction with the flip-up rotation of the hook body 21. There has been proposed an automatic sling wire removing device for a hanger equipped with a link member 25 (see Japanese Utility Model Laid-Open No. 1-90782). That is, in this device, the wire detachment preventing member 23 is opened by lifting the hook main body 21 through the wire 26 by the driving device, and the wire removing link member 25
The sling wire hung on the hook is pushed out.

[0004]

However, the conventional hook disengagement preventing mechanism described above has the following drawbacks. That is, the disengagement prevention device in the hook with the disengagement prevention device described in Japanese Utility Model Laid-Open No. 62-92278 has a relatively simple mechanism, but the arm 13 for opening and closing the opening of the hook body 11 is in a closed state. The holding means adopts a method of pressing the base of the arm from above with the pressing member 11 attached to the support 12 pivotally attached to the hook body 14, so that the pressing force is weak and the holding means vibrates during cargo handling work. Alternatively, there is a possibility that the suspension ring or the sling wire in the hook and hook portion may be easily separated due to an impact or the like, which is unsafe. Further, since this disengagement prevention device is of a manual type, it is necessary to manually approach the hook or pull the hook each time when attaching / detaching the hanger or the like, which is troublesome. Not only is it time consuming, but it is even dangerous when the product is a fragile product such as a pipe.

On the other hand, the hook disengagement prevention mechanism described in Japanese Utility Model Laid-Open No. 1-90782 is capable of automatically closing and opening the hook main body opening, which is excellent in that the cargo handling work can be automated. However, not only is the structure complicated and costly, but it is difficult to separate the sling wire removal mechanism and the hook removal prevention mechanism when performing slinging work when the hook drive device fails, and many slinging work are required. It has the drawback of requiring labor and time.

The present invention has been made in order to solve these drawbacks, and simplifies the hook disengagement prevention mechanism, and the automatic hook disengagement enables the slinging work to be performed in a short time even if the drive device fails. It is intended to provide a protection device.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a hook disengagement prevention device for closing and opening an opening of a hook body curved in a hook shape by introducing a fluid pressure cylinder into a power source of the hook disengagement prevention mechanism. It employs a method that opens and closes the hook retaining member via a wire that expands and contracts when the cylinder operates, and its gist is the fluid pressure cylinder or electric cylinder horizontally installed on the back side of the neck of the hook body and the hook. A hook disengagement member mounted on the neck opening side of the main body so as to be rotatable in the vertical direction about a pivot as a fulcrum is connected by a wire through a pulley, and the hook disengagement prevention member is connected to the fluid pressure cylinder or the electric cylinder. Is a mechanism for vertically rotating about a pivot as a fulcrum to close and open the opening of the hook main body.

As the fluid pressure cylinder used as the power source of the hook detachment preventing mechanism, for example, a hydraulic cylinder or an air cylinder is generally used. The fluid pressure cylinder or the electric cylinder can be installed on a support member such as a bracket detachably attached to the neck portion of the hook body. On the other hand, the hook disengagement prevention member has one end pivotally attached to a support member such as the bracket in a vertically rotatable manner, and the other end and the rod tip of the fluid pressure cylinder or the electric cylinder via a plurality of pulleys. It is connected by a wire and is attached as if opening and closing the hook body opening with a fluid pressure cylinder or an electric cylinder. That is, the wire is pulled by the forward movement of a fluid pressure cylinder or an electric cylinder horizontally installed, the hook detachment member is lifted to open the hook main body opening, and conversely, the wire is loosened by the backward movement of the cylinder and the hook is released. The retaining member is lowered by its own weight to close the opening of the hook body.

[0009]

1 is a front view showing an example of an automatic hook detachment preventing device when the present invention is applied to a hook of an overhead crane, FIG. 2 is a side view of the same device, and 1 is a hook body, 2 is a support member, 3 is an air cylinder, 4 is a hook disengagement prevention member, 5 is a wire, 6-1 and
6-2 is a pulley, 7 is a hook body supporting member, 8 is a wire rope for an overhead crane, and 9 is a pulley for the same crane. Here, a case where a fluid pressure cylinder (air cylinder) is used as a drive source will be described as an example.

That is, the automatic hook disengagement prevention device according to the present invention has a neck portion of a hook body 1 rotatably supported by a hook body supporting member 2 of an overhead crane.
The support member 2 is detachably attached. The support member 2 has an openable and closable tubular portion 2-2 at one end of a plate member 2-1 having a width substantially equal to the diameter of the neck portion of the hook body 1, and the tubular portion 2-2 is connected to the neck portion of the hook body 1. It has a structure that can be externally fitted and fixed by bolts. The support member 2 is attached to the neck of the hook body 1 so that the plate member 2-1 projects toward the back side of the neck, and the air cylinder 3 is mounted on the plate member 2-1 in a direction perpendicular to the vertical axis of the neck of the hook body. Install horizontally.

On the other hand, the hook disengagement prevention member 4 has a structure in which two plate members 4-1 having a substantially triangular shape as shown in the figure are integrated via a spacer member 4-2. The distance between the two plate members is slightly wider than that of the hook portion of the hook body 1. When the hook disengagement prevention member 4 is attached, the hook disengagement prevention member 4 is arranged in the opening of the hook body 1 so that one end of the member is located on the back side of the hook body hook.
A bracket 2 in which an upper end portion of the hook disengagement prevention member 4 is projectingly provided on a hook opening side opposite to the air cylinder 3.
-3 is pivotally attached in a vertically rotatable manner.

The opening / closing operation mechanism of the hook detachment preventing member 4 supports a wire 5 having one end connected to the rod tip of the air cylinder 3 via a bracket 3-1 and having the air cylinder 3 attached thereto. Connected to the back side end of the hook main body hook portion of the hook disengagement prevention member 4 via two pulleys 6-1 and 6-2 installed in the member 2 in different directions, and by the forward movement of the air cylinder 3. The wire 5 is pulled and the hook detachment preventing member 4 is lifted to open the hook body opening. Conversely, the backward movement of the cylinder loosens the wire 5 so that the hook detachment preventing member 4 is lowered by its own weight and the hook body opening is closed. It is a mechanism that can be.

As described above, in the automatic hook disengagement prevention device having the above structure, when the air cylinder 3 is moved forward, the hook disengagement prevention member 4 is lifted to open the opening of the hook body 1, and conversely, the air cylinder. When the hook 3 is moved backward, the hook detachment preventing member 4 is lowered by its own weight to close the opening of the hook main body 1. That is,
The automatic hook disengagement prevention device according to the present invention can close and open the opening of the hook main body 1 only by moving the air cylinder 3 forward and backward. The control of the automatic hook disengagement prevention device can be automatically performed by installing a control panel of the air cylinder 3 on an appropriate member of an overhead crane, for example.

[0014]

Since the present invention is constructed as described above, the structure of the automatic hook disengagement prevention device can be simplified, and when the fluid pressure cylinder or the electric cylinder fails, the hook disengagement prevention member is provided. Opening and closing work can be done easily by simply disconnecting the wires. Further, the hook disengagement prevention member is supported at two points of the upper end portion and the lower end portion thereof, and the upper end portion is pivotally mounted above the hook opening portion. Therefore, when the hook opening portion is closed, this pivotally attached portion serves as a stopper. It does not open accidentally, has high safety, and can be easily attached to an existing overhead crane, etc. It has a simple structure and excellent effects, and is extremely useful.

[Brief description of the drawings]

FIG. 1 is a front view showing an automatic hook detachment preventing device when the present invention is applied to a hook of an overhead crane.

FIG. 2 is a side view of the same device.

FIG. 3 is a side view showing an example of conventional hook detachment preventing means.

FIG. 4 is a side view showing another conventional hook detachment preventing means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hook body 2 Support member 3 Air cylinder 4 Hook disengagement member 5 Wires 6-1 and 6-2 Pulley 7 Hook body support member 8 Wire rope for overhead crane 9 Pulley for the same crane

Claims (1)

[Claims] 1. A hook disengagement prevention device for closing and opening an opening of a hook body curved in a hook shape, the device being the same as a fluid pressure cylinder or an electric cylinder horizontally installed on the back side of the neck of the hook body. A hook disengagement prevention member that is attached to the opening of the neck of the hook main body in a vertically rotatable manner about a pivot as a fulcrum is connected by a wire via a pulley, and the hook disengagement prevention is performed by the fluid pressure cylinder or the electric cylinder. An automatic hook disengagement prevention device characterized in that a member pivots up and down around a pivot to close and open a hook body opening.