JPH08333082A - Rocking damping device of cargo handling gear - Google Patents

Abstract

PURPOSE: To damp rocking in travelling without causing any troubles during cargo work by providing a large diameter hydraulic cylinder having the axis directed vertically and a small diameter hydraulic cylinder having the axis below the said axis on the same straight line as said axis. CONSTITUTION: When a wheel is going to part from a rail 7 in rocking during travelling, the lower end 5b of a derailment preventing guide 5 abuts against the lower surface of a head flange 7a of the rail 7 to depress a piston 1a of a large diameter hydraulic cylinder 1. Since a lower oiling port 3d 11 communicate to an upper oiling port 3d of a small diameter hydraulic cylinder 3 through a hydraulic piping 8, an impact absorbing pad 6 abuts against rail earlier than the wheel does in landing to be pushed up by the rail 7. Since oil flowing out of the upper oiling port 3d of the small diameter hydraulic cylinder 3 is throttled by an one-way throttle valve 10, the impact absorbing pad 6 is slowly moved to buffer the impact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocking shock absorber for a cargo handling device having a gate type traveling frame such as a container crane and a serial unloader.

[0002]

2. Description of the Related Art FIG. 2 is a side view of a container crane generally used as a cargo handling device. As shown in the figure, the traveling frame e has a leg a, a horizontal member b connecting them, and a diagonal member c, and is of a gate type. Wheels d are provided under the legs a. f is a girder fixed to the upper part of the frame e, and g is a boom that is connected to the girder f and undulates around the connection point. h is a spreader that holds the container, and i is a trolley that travels on the boom g and the girder f.

FIG. 3 is a view taken along the line AA of FIG. D in the figure
Is a wheel, j is a small rocker beam, k is a medium rocker beam, m
Is a large rocker beam, n is a connecting beam, o is a rail clamp, and p is a rail. As shown in the figure, since the wheel d is supported by the multiple rocker mechanism, the specific wheel d
It is designed not to apply excessive force to. The rail clamp o is a device that resists gusts and the like to prevent runaway or tipping when the vehicle is stopped while carrying out cargo handling work or at rest, and grips the rail with a strong force.

[0004]

There is no problem because there is a rail clamp o at the time of stop, but if the cargo handling device receives a large external force due to an earthquake or a gust of wind during traveling, especially the horizontal force perpendicular to the longitudinal direction of the rail, the whole device will May cause rocking, and the wheel d may momentarily float up from the rail p. When the lifted wheel lands on the rail p again, it may cause a severe impact, and the rail p may be dented or the wheel d may be broken.

It has been proposed to elastically support a wheel as a device for absorbing such shock (for example, in actual exploitation 55-
140082 "Crane traveling device", JP-A-55-1
11388 "seismic crane"). However, if the wheels d are elastically supported, there is a problem that the crane as a whole tilts as the load moves during normal cargo handling.

The present invention has been devised in view of the above problems of the prior art, and provides a rocking shock absorber for a cargo handling device capable of cushioning the rocking during traveling without causing any trouble during the cargo handling work. The purpose is to do.

[0007]

To achieve the above object, a rocking shock absorber for a cargo handling device according to the present invention is a rocking shock absorber for a cargo handling device provided at a lower portion of a leg of a cargo handling device having a gate type traveling frame. A large-diameter hydraulic cylinder whose axial center is oriented in the vertical direction, and below the large-diameter hydraulic cylinder, the axial center is substantially collinear with the axial center of the large-diameter cylinder. A small-diameter hydraulic cylinder, a derailment prevention guide that consists of a pair of members that are pivotally attached to the lower end of the piston rod of the large-diameter hydraulic cylinder and hang down, and the lower end faces the rail abdomen, and the piston of the small-diameter hydraulic cylinder. The large-diameter hydraulic cylinder and the small-diameter hydraulic cylinder have a built-in spring below the piston, and are equipped with a shock-absorbing pad fixed to the lower end of the rod. When in communication and the upper oil supply port of the small-diameter hydraulic cylinder, and the oil supply port below the upper oil supply port and a small-diameter hydraulic cylinder of a large diameter of the hydraulic cylinder is communicated. Further, it is preferable that both the large-diameter hydraulic cylinder and the small-diameter hydraulic cylinder are double rod type.

[0008]

[Operation] When a large load such as an earthquake acts on a cargo handling device such as a crane and the wheels try to separate from the rail, the lower end of the wheel removal prevention guide hits the underside of the head flange of the rail and becomes large. Push down the piston in the hydraulic cylinder of diameter. Since the lower oil supply port of the large-diameter hydraulic cylinder and the upper oil supply port of the small-diameter hydraulic cylinder communicate with each other, the piston of the small-diameter hydraulic cylinder moves downward in conjunction with the piston in the large-diameter hydraulic cylinder. Due to the difference in the bores of the two cylinders, the stroke of the piston in the small-diameter hydraulic cylinder is larger, and the shock absorbing pad attached to the lower end of the piston rod is pushed down greatly. Therefore, at the time of landing, the shock absorbing pad hits the rail earlier than the wheel and the shock absorbing pad is pushed up slowly, so that the shock when the wheel lands is buffered. Both hydraulic cylinders have a built-in spring below the piston and support the piston at a fixed position, so there is no risk of obstructing the traveling during normal traveling.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a rocking shock absorber for a cargo handling device according to the present invention, and FIG.
(B) is a front sectional view. In the figure, reference numeral 1 denotes a large diameter hydraulic cylinder, the axis of which is oriented in the vertical direction, and a pair of trunnions 1d is provided at the center of the cylinder.
It is swingably supported by a pair of brackets 2. A piston rod 1b is vertically attached to both surfaces of a piston 1a of the large-diameter hydraulic cylinder 1, and a derailment prevention guide 5 described later is attached to a lower end of the piston rod 1b. Piston 1 of large diameter hydraulic cylinder 1
A large-diameter spring 1c is built in below a.

Below the large-diameter hydraulic cylinder 1, a small-diameter hydraulic cylinder 3 is provided so that its axis is substantially on the same straight line as the axis of the large-diameter hydraulic cylinder. The hydraulic cylinder 3 having a small diameter has an upper surface fixed and supported by a pair of brackets 4. Piston rods 3b are attached to both sides of the piston 3a of the small diameter hydraulic cylinder 3. A small diameter spring 3c is built in below the piston 3a of the small diameter hydraulic cylinder 3.

Piston rod 1 of large diameter hydraulic cylinder 1
A forked metal object 1g having a pin 1h is fixed to the lower end of b. The lower end 5b of the pin 1h has a rail 7 which will be described later.
Pair of members 5a, 5a facing each other with the abdomen 7b of the
The derailment prevention guide 5 is pivotally attached and hung down.

Piston rod 3 of small diameter hydraulic cylinder 3
A shock absorbing pad 6 is fixed to the lower end of b. An elastic body 6a such as rubber is attached to the lower surface of the shock absorbing pad 6.

A rail 7 is composed of a head flange 7a, a bottom flange 7c, and an abdomen 7b connecting them.

The lower oil supply port 1f of the large-diameter hydraulic cylinder 1 and the upper oil supply port 3d of the small-diameter hydraulic cylinder 3 are connected by a hydraulic pipe 8, and a one-way throttle valve 10 is provided in the middle of the pipe 8. Has been.

An oil supply port 1e above the large-diameter hydraulic cylinder 1 and an oil supply port 3e below the small-diameter hydraulic cylinder 3 are connected by a hydraulic pipe 9. It is preferable to insert a flexible hose (not shown) in the middle of the hydraulic pipes 8 and 9.

Reference numeral 11 is a leg of the cargo handling device. The installation location of this device may be near the rail clamp o at the center of the connecting beam n, as shown by arrows A, B or C in FIG. 3, at the lower surface of the central portion of the large rocker beam m, or at the central portion of the middle rocker beam k. It may be the bottom surface.

Next, the operation of this embodiment will be described. When a heavy load such as an earthquake or a gust of wind acts on the cargo handling device such as a container crane during traveling and the wheels d try to separate from the rail 7, the lower end 5 of the wheel removal prevention guide 5
b hits the lower surface of the head flange 7a of the rail 7, and pushes down the piston 1a of the large diameter hydraulic cylinder 1.

Since the oil supply port 1f below the large-diameter hydraulic cylinder 1a and the oil supply port above the small-diameter hydraulic cylinder 3 are communicated with each other by a hydraulic pipe 8, the small-diameter hydraulic cylinder 1 works in conjunction with the piston 1a. Although the piston 3a of the hydraulic cylinder 3 of FIG. 2 also descends downward, the stroke of the piston 3a in the small-diameter hydraulic cylinder 3 is larger due to the difference in the bores of the cylinders 1 and 3, and the impact absorption fixed to the lower end of the piston rod 3b is absorbed. The pad 6 is largely pushed down. Therefore, at the time of landing, the shock absorbing pad 6 hits the rail 7 earlier than the wheel d, and the shock absorbing pad 6 is pushed up by the rail, but the oil flowing out from the oil supply port 3d above the small diameter hydraulic cylinder 3 is unidirectional. Since it is throttled by the throttle valve 10, the shock absorbing pad b moves slowly and buffers the shock when the wheel d lands on the rail 7. If the piping resistance is high, the throttle valve 10 can be omitted.

The hydraulic cylinders 1 and 3 are both pistons 1.
Since springs 1c and 3c are built in below a and 3a and the pistons 1a and 3a are supported so as to be in a fixed position, the state is as shown in FIG. 1 during normal running, which may interfere with running. There is no danger of becoming.

The present invention is not limited to the above embodiment, but various modifications can be made within the scope of the claims.

[0021]

As described above, the rocking shock absorber of the cargo handling apparatus of the present invention comprises the large diameter hydraulic cylinder and the small diameter hydraulic cylinder, and the shock absorbing pad attached to the lower end of the piston rod of the small diameter hydraulic cylinder at the time of rocking. Since it descends below the wheel and hits the rail earlier than the wheel at the time of landing and absorbs the impact, there is an excellent effect that the impact is almost eliminated when the wheel lands.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rocking shock absorber for a cargo handling device according to the present invention.

FIG. 2 is a side view of a cargo handling device (container crane).

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

[Explanation of symbols]

 1 Large-diameter hydraulic cylinder 1b Large-diameter hydraulic cylinder piston rod 1c Large-diameter spring 1e Large oil-hydraulic cylinder upper lubrication port 1f Large-diameter hydraulic cylinder lower lubrication port 3 Small-diameter hydraulic cylinder 3b Small-diameter Piston rod of hydraulic cylinder 3c Small diameter spring 3e Upper oil supply port of small diameter hydraulic cylinder 3f Lower oil supply port of small diameter hydraulic cylinder 5 Derailing prevention guide 6 Impact absorption pad 7 Rail

Claims (2)

[Claims] 1. A rocking shock absorbing device for a cargo handling device provided at a lower portion of a leg of a cargo handling device having a gate-shaped traveling frame, the hydraulic cylinder having a large diameter, the axis of which is oriented vertically. The small diameter hydraulic cylinder is installed below the large diameter hydraulic cylinder so that its axis is substantially on the same straight line as the large diameter cylinder. And a lowering prevention guide which is composed of a pair of members whose lower ends face each other across the abdomen of the rail,
It consists of a shock absorbing pad fixed to the lower end of the piston rod of a small diameter hydraulic cylinder.The large diameter hydraulic cylinder and the small diameter hydraulic cylinder have a built-in spring below the piston. The port and the oil supply port above the small diameter hydraulic cylinder are in communication,
A rocking shock absorber for a cargo handling device, wherein an upper oil supply port of a large diameter hydraulic cylinder and a lower oil supply port of a small diameter hydraulic cylinder communicate with each other. 2. The rocking shock absorber for a cargo handling device according to claim 1, wherein the large-diameter hydraulic cylinder and the small-diameter hydraulic cylinder are both rod type.