JPS6026064Y2 - Anti-sway device for crane hanging loads - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for stabilizing a suspended load of a crane.

BACKGROUND ART Conventionally, a crane as shown in FIG. 1 is known in which cargo handling work is carried out by running a trolley on a crane girder, and the crane shown in FIG.

A pair of cable hooks separated from each other at the front and rear of the traveling trolley 3 are connected to two pulleys 6 and 8 on one side of the pulley, respectively, for the two wires A and B that are paid out from the winding drum 5 provided at one end of the crane girder 1. After hanging from the rope and wrapping it around the pulleys 11 and 12 of the lifting device 10, the pair of ropes are hung from the other pulleys 7 and 9 of the pulley, and then fixed to the other end of the crane girder 1. It consists of two wires A with a hanging load suspended in the center in a V-shape,
By suspending the load at point B, swinging of the suspended load is suppressed.

Here, the pair of rigging pulleys 6 and 7 are actually attached coaxially as shown in FIG. 2, and the same applies to the rigging pulleys 8 and 9.

Further, the trolley 3 is configured to run on a rail 2 laid on the crane girder 1 by a drive device (not shown).

However, although this device is more effective in suppressing vibration than when a suspended load is suspended with a single wire, a sufficient vibration damping effect could not be obtained.

This idea was created in view of the above-mentioned circumstances, and its purpose is to balance the unbalanced tension that acts on the two wires due to the swinging of the suspended load using a pair of hydraulic dampers installed on the trolley. Therefore, it is an object of the present invention to provide a device for preventing the vibration of a crane suspended load, which is capable of attenuating the swing of a suspended load in a short period of time.

An embodiment of this device will be described below with reference to FIG.

A pair of hydraulic dampers 31 and 32 are provided facing each other before and after the trolley 3, and the corresponding cylinder chambers of both hydraulic dampers 31 and 32 are connected by hydraulic pipes 34 and 35 having throttle valves 34a and 935a in the middle of the pipes, respectively. ing.

And the piston rods 31a of both hydraulic dampers 31, 32
, 32a are connected by a connecting body 33, and this connecting body 3
3 is provided with a wheel 33a on the lower side so that the piston rods 31a and 32a move straight in the horizontal direction.

Furthermore, pulleys 21, 23 are provided at both ends of the connecting body 33.

Then, as in the case of FIG. The rope was hung on pulleys 16 and 17 fixed to the trolley 3, and then, as in the case of FIG. Thereafter, it is wound around the pulley 21 on the connecting body 33, and the final end is fixed to the other end (not shown) of the crane girder 1.

The other wire B is first wound around the pulley 23 on the connecting body 33 in the reverse order of the wire A, then the fixed pulley 24, and then the cable is wound around the pulley 8°9 and the pulley 19 of the hanging device 10. ．．
18, the other end of the crane girder 1 (not shown)
is fixed in the same way as wire A.

Therefore, when the suspended load swings in the right direction (arrow) in FIG. , pulley 2
1, a tensile force is generated which tries to move the connecting body 33 in the left direction opposite to the swing of the suspended load, and this force is applied to the connecting body 3.
3 to the left is damped by the hydraulic tamper 31.

At this time, the piston rods 31a and 32a are integrally connected by an M body 33, and the cylinder chambers of both hydraulic dampers 31, 32 are connected to each other by piping 34, 35, so that
The pulley 23 on the connecting body 33 also moves to the left to remove the slack in the wire B caused by the swinging of the suspended load, thereby balancing the unbalanced tension acting on the wires A and B.

Once the suspended load swings to the right, it swings to the left due to the reaction, the connecting body 33 moves to the right, contrary to the above, and balances the unbalanced tension acting on wires A and B. By repeating this action, the swing of the suspended load is attenuated in a short period of time.

In this case, the strength of the hydraulic dampers 31 and 32 is equal to that of the throttle valve 34a.
, 35 Adjust as appropriate in a.

In addition, a pair of cable hooks provided separately on the trolley 3 are connected to pulleys 6 and 7.
If the distance between the axes of 8 and 9 can be adjusted,
Not only is this convenient for cargo handling in places with small openings, such as ship holds, but the opening angle of the wire suspended in a V-shape can be increased to improve the effect of preventing the suspended load from swaying.

In addition, if the suspended load is long, it is advisable to provide two or more sets of the above devices.

Since the crane suspension device of this invention is constructed as described above, it has the following effects.

1. Since the swinging of the suspended load is actively damped by a pair of hydraulic dampers, the swinging effect of the suspended load is greater than that of the conventional system, and the swinging of the suspended load can be stopped in a short time.

2. Since the piston rods of the pair of hydraulic dampers are connected by a horizontally moving connecting body, the movements of the pistons of both hydraulic dampers correspond perfectly, so the hydraulic dampers can operate reliably, which can prevent malfunctions. do not have.

3. Since a pair of hydraulic dampers are provided on the trolley, maintenance and adjustment around the hydraulic dampers can be facilitated.

4. Since tensile force acts on the connecting body, there is no need for the connecting body to have a rigid structure, and weight reduction can be achieved.

[Brief explanation of drawings]

Figure 1 is a schematic explanatory diagram of a conventional crane suspension device, Figure 2 is an explanatory diagram of the actual arrangement of pulleys in Figure 1, and Figure 3 is a diagram of this invention's crane suspension device. FIG. 2 is an explanatory diagram of main parts showing one embodiment of the device. 1... Crane girder, 2... Girder rail,
3... Trolley, 5... Winding drum, 6
, 7 and 8, 9... The pair of ropes are pulleys, 21,
23... Pulley on connection body, 31.32...
...Hydraulic tamper, 31a, 32a...Piston rod, 33...6 bodies, 34. 35...
...Connection piping, A, B...Wire, L...
...Hanging load.

Claims (1)

[Scope of utility model registration request] A pair of wire hooks, spaced apart before and after the trolley running on the crane's girder rail, suspends the two wires unwound from the winding drum in a V-shape from the pulley in the center to suppress swinging of the suspended load. In the apparatus, a pair of front and rear hydraulic dampers are provided facing each other on the trolley, and the cylinder chambers of the two hydraulic dampers are connected by piping to each other, and the piston rods of the hydraulic dampers are connected to move horizontally between the piston rods. A device for stabilizing a crane suspended load, comprising a pulley on which the above two wires are hung, which are connected by a body and apply a tensile force to the connected body.