JPS59172382A - Center rest device for hung load of crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crane load swinging device.

A crane, especially an overhead lane, is equipped with a rope transmission system for a club that can move laterally on the gutter, and is used to lift and unload heavy objects, i.e., hanging loads, which are slinged to a sheave block with a hook that is held suspended. However, the suspended load often shakes during this transfer, and operation control to prevent or calm this movement requires skill, especially when attempting to automate crane operation. In such cases, it is essential to steady the suspended load.

This problem can be solved not only by overhead running lanes, but also by suspending and holding the sheave block using a suspended moving frame similar to the above-mentioned club, which moves along a movable or fixed girder, such as a jib crane or hoist. The cases are almost the same.

To prevent such shipping from steadying, for example, a sheave block is provided with at least a pair of restraining arms projecting upward in an angular shape at both ends, so that the angular ends can be fixed at the planned lifting height of the suspended load. By installing a stopper that protrudes from the lower surface of the suspension moving frame, such as the club, and hoisting the sheave block to a position that brings about the collision, the horizontal force that causes the suspended load to swing during transportation can be reduced. When the shipment is particularly heavy, F=W/! according to the weight W and the acceleration α during transportation. J
・α where g: Horizontal force exerted by the acceleration of gravity creates a moment that generates excessive stress on the club or even the girder via the stopper, requiring reinforcement and increasing costs for modification. There are drawbacks.

Therefore, the object of the present invention is to realize an appropriate steady rest without requiring such modification and without causing excessive stress to the club or girder as described above.

In other words, the present invention is directed to a club running horizontally along a track laid on the girder of an overhead lane running along a track laid on a girder of a factory building, or to the underside of a similar suspension moving frame. At least a pair of guide sleeves are installed across the lifting path of the sheave block with a hook by the rope transmission system installed on the frame, and the guide rod, which can be telescopically inserted into and removed from the guide sleeve, has a downward opening at its lower end. The receiver is provided with a mouth, and the receiver has at least a pair of restraining arms with upwardly facing angular ends facing the mouth, and is attached to the sheave block, and a shock absorber is disposed inside the guide sleeve, so that movement of the crane is prevented. The above-mentioned horizontal force F caused by this is counteracted by the damping force generated in the shock absorber, thereby particularly advantageously suppressing the occurrence of rocking.

Fig. 1 shows an embodiment in which the present invention is applied to an overhead running lane, in which 1 is a factory building, 2 is a girder, 3 is a club, and 4 and 5 are their tracks, 4a.

5a is a wheel.

A rope transmission system 7 is installed on the club 3, and the rope is wound around the winding body 8. The rope is wound around the sheave 12 of the sheave block 11, which has a hook 9 pivotally supported by a pin 10, and one end is attached to the club 3. By fixing on the sheave block 1
1 and thus the hook 9 can be raised and lowered. In the figure, the extreme raised position of the sieve block 11 is shown by a solid line, and the imaginary line shows a slightly lowered position.

The sheave block 11 has a sheave 12 supported by a pin 13 at the upper end, and a hook 9 supported by a pin 10 (8 supported yoke 14).
They are combined with a restraining arm 15 extending left and right between them, and upwardly facing angular ends 16 are protruded from both sides of the restraining arm 15.

A pair of guide sleeves 1 are provided on the lower surface of the club 3, sandwiching the lifting path of the sheave block 11 by the rope transmission system 7.
7 is attached to the guide sleeve 17, and a guide rod 18 that can be telescopically moved in and out is assembled inside the guide sleeve 17, and a downward opening is provided at the lower end of this kite rod 18, facing the square end 16 of the restraining arm 15. The receiver is provided with an opening 19.

In the figure, 20 is a joint sleeve extending from the guide sleeve 17 to hold the guide rod 18, 21 is a sleeve to which the guide sleeve 17 is attached, and 22 is a reinforcing angle.

As described above, the guide sleeve 17 and the guide rod 18 do not show any resistance even if one of the restraining arms 16 is tilted by the horizontal force F acting on the suspended load. Guide rod 18
A yoke is provided at the upper end of the relay sleeve 21 and at the partition plate 23 of the relay sleeve 21, and in this example, a shock absorber 24 consisting of a hydraulic cylinder and piston assembly is attached.

For example, as schematically shown in FIG. 2, the shock absorber 24 is connected to a cylinder 28 so that the movement of the piston 25 in one direction is made free by a check valve 26, and a hydraulic damping force is generated by an orifice 27 when the piston 25 moves in the opposite direction. In combination, the receiver causes the damping force to be generated when the corner end 16 is raised relative to the mouth 19.

Therefore, the horizontal force 1 caused by the acceleration α based on the activation of the club 3, for example, is applied to the mass w/g of the hanging load suspended from the hook 9, and the angular end 16 of the restraining arm 15 connects to the socket 19 on one side. When the clubs collide, the damping force creates a gentle resistance, and it is possible to effectively suppress the rocking during shipping while preventing an excessive load from acting on the club 3 itself.

Of course, it is necessary for the sheave block 11 to be hoisted to the above-mentioned position when starting the club 3, and such a position can be controlled by a conventional device such as a limit switch (not shown). Since it can be easily controlled by means, there is no need to explain it in detail.

In another embodiment shown in FIG. 3, a brake shoe 29 that applies a tightening spring force to/against the guide rod 18 and a thrust spring 30 that applies a downward force are arranged inside the guide sleeve 17. It works as a shock absorber. Reference numeral 31 is a brake spring, which is almost the same as the case shown in Fig. 1, except that the friction force generated by the brake shoe 29 and the reaction force of the thrust spring 30 act as a force to stop the vibration and dampen the vibration. be.

Here, the guide rod 18 may be a simple round or square bar, but if it is tapered upward as shown in the figure, the frictional resistance will gradually increase during upward movement, so the guide rod 18
Braking performance can be advantageously improved regardless of wear. Note that 32 in the figure is an adjustment screw.

When the above-mentioned damping effect is produced on one side of the kite rod 18,
The guide rod on the other side is pushed down by a thrust spring, so if the thrust spring 30 is too strong for the tightening force, it will work to increase the deflection, so this thrust spring 30 By limiting the attachment force to an extent that overcomes the chick rubbing resistance, the pushing down force by the thrust spring 30 is almost consumed by the frictional resistance, and the guide rod 18 follows the restraining arm 16 without causing an increase in deflection. It will only be done.

When the tension is reversed, the function of the guide rod 18 is as follows.
On the left and right sides of the figure, it also controls vibration damping.

Therefore, due to the horizontal force F caused by the acceleration α based on the activation of the club 3, the angular end 16 of the restraining arm 15 has one socket on one side. A slow resistance is generated by the damping force on the abutting sides, and it is possible to effectively suppress the Jjt movement of the suspended load while preventing an excessive load from acting on the club 3 itself.

Although we have explained how to suppress the swinging of the suspended load during the lateral movement of the top club 3, we have explained that the vibration of the suspended load that occurs in the direction perpendicular to the paper plane of FIGS. 1 and 3 (when the girder 2 moves) Needless to say, in order to suppress rocking, the arrangement can be carried out in accordance with the arrangement shown in the left and right relationship in FIG.

Thus, according to the present invention, it is possible to eliminate the need for special reinforcing modifications to the lifting and moving frame of a crane, and to eliminate the need for any special reinforcing modifications to the lifting and moving frame of the crane. By incorporating a shock absorber that helps attenuate and absorb the horizontal force, the swinging of the load can be effectively suppressed, and the system can be advantageously used for autopilot operation.

A front view showing an example of FIG. 2 is a sectional view of the buffer.

1... Factory building 2... Garter 3... Club (suspended moving frame) 7... Rope transmission system 11... Sheave block with hook 15... Restraining arm 16... Square end 17...
・Guide sleeve 18... Guide rod 19...
24.29-30...buffer, patent applicant Kawasaki Steel Corporation

Claims (1)

[Scope of Claims] 1. A club or a similar suspension that runs along a track laid on the girder of an overhead lane that runs along a track laid on the girder of a factory building. At least a pair of kite sleeves are installed on the lower surface of the movable frame, sandwiching the lifting path of the sheave block with hooks by the rope transmission system installed on the frame, and the guide rod, which can be telescopically inserted into and removed from the guide sleeve, is equipped with a kite sleeve. A receiver is provided which opens downward at the lower end, and this receiver has at least a pair of restraining arms with upwardly facing angular ends facing the mouth, and is attached to the sheave block, and a buffer is disposed inside the guide sleeve. A crane hanging load resting device, which is characterized by: