JPH08310785A - Hinged leg structure for cargo handling device - Google Patents

Abstract

PURPOSE: To regulate the abrupt rocking of hinged legs and prevent derailment and collapse of the whole cargo handling device even when the device is rocked and wheels are floated by providing dashpots near the pins connecting a horizontal frame and the hinged legs. CONSTITUTION: A bracket 2a is stretched from a horizontal frame 2, a bracket 3a is stretched from a hinged leg 3, the end section of the piston rod 20b of a dashpot 20 and the bracket 2a are connected by a pin 21, and the end section of the cylinder 20a side of the dashpot 20 and the bracket 3a are connected by a pin 22. When a cargo handling device is rocked by an earthquake and wheels 12 are floated, the hinged leg 3 instantly tends to be rocked. The dashpot 20 is operated, large resistance force proportional to the speed of rocking is applied, and rocking can be regulated. The floated wheels 12 are grounded on rails 11 as before, and no derailment occurs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocking leg structure for a cargo handling apparatus having a gate type traveling frame such as a container crane and a continuous unloader.

[0002]

2. Description of the Related Art FIG. 4 is a front view of a continuous unloader. In the figure, 1 is a gate type traveling frame, 2 is a traveling frame 1
Horizontal frame, 3 is a swing leg, 4 is a rigid leg, 5 is a bucket elevator, 6 is a boom, 7 is a balancing lever, 8 is a swing frame, 9 is a belt conveyor, and 10 is a pin that connects the horizontal frame and the swing leg. , 11 are rails.

As shown in the figure, a gate type traveling frame 1 is adapted to travel on a rail 11. The traveling frame 1 has a horizontal frame 2 and legs on both sides thereof, and is of a gate type. One of the legs is a swing leg 3 and is pin-connected to the horizontal frame 2, and the other is a rigid leg 4 rigidly connected to the horizontal frame 1.

FIG. 5 is a view taken along the line AA of FIG. 1 in the figure
2 is a wheel, 13 is a small rocker beam, 14 is a large rocker beam, and 15 is a rail clamp for preventing runaway. As shown in the figure, the wheels are supported by multiple rocker mechanisms, so that an excessive force is not applied to a particular wheel. In addition, the rail 11 can travel in correspondence with some irregularities. The wheel 12 is a double flange type. One of the legs is the swing leg 3 because the flange of the wheel hits the rail during traveling when the span between the rails 11 is not constant and slightly changes, which makes traveling difficult. If they are kept, both may have rigid legs.

[0005]

When such a cargo handling device receives a large external force, especially a horizontal force perpendicular to the longitudinal direction of the rail, due to an earthquake or the like while the vehicle is running, the entire device causes locking, and the wheels 12 instantaneously move from the rail 11. Sometimes rises. In that case, both legs of the traveling frame 1 are rigid legs 4
If so, there is no problem because the lifted wheel returns to its original state as it is, but if one side is the swing leg 3, the angle formed by the horizontal frame 2 and the swing leg 3 changes at the moment the wheel 12 rises. When the lifted wheel 12 lands, it may not be able to return to the rail 11 and may derail and fall.

The present invention has been devised in view of the above problems, and an object of the present invention is to provide a swinging leg structure of a cargo handling device which makes it difficult to derail even when an earthquake or the like occurs during traveling. .

[0007]

In order to achieve the above object, a rocking leg structure of a cargo handling apparatus according to the present invention has a gate-shaped running frame that runs on a rail, and one leg of the running frame is a rocking leg. The swinging structure of the cargo handling device, wherein the horizontal frame and the swinging leg are connected to each other in the vicinity of a pin connecting the horizontal frame and the swinging leg of the traveling frame, and the swinging leg is rapidly rocked. A dashpot that regulates

The dashpot may have springs on both sides of the piston.

[0009]

[Operation] Since a dashpot that connects the horizontal frame and rocking leg was provided near the pin that connects the horizontal frame and rocking leg of the running frame, rocking occurred due to an earthquake, etc. Even at this time, the dashpot exerts a great effect against sudden movements and tries to stop the movement, so the angle between the horizontal frame and the rocking leg does not change, and the lifted wheels return to their original positions and remain on the rail. Since it lands on No. 11, it will not fall off and therefore will not collapse.

Further, if springs are provided on both sides of the piston of the dashpot, the restoring force is further reinforced, so that the ability to prevent derailment is further increased.

[0011]

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 front view of a rocking leg structure of a cargo handling device of the present invention. In the figure, 2 is a horizontal frame, 3 is a swing leg, 10 is a pin, and 20 is a dashpot. The same parts as those described in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in the drawing, the horizontal frame 2 and the swing leg 3 are connected by a pin 10. A dashpot 20 is attached near the pin 10. The bracket 2a is provided so as to extend from the horizontal frame 2, the bracket 3a is provided so as to extend from the rocking leg 3, and the end portion of the piston rod 20b of the dashpot 20 and the bracket 2a are provided with the pin 2.
1, the end of the dashpot 20 on the cylinder 20a side and the bracket 3a are connected by a pin 22.

FIG. 2 is a conceptual diagram of the dashpot 20. In the figure, 20a is a cylinder, 20b is a piston rod,
20c is a piston and 20d is a small hole provided in the piston 20c. The dashpot 20 is filled with oil, and when the piston rod 20b is moved in and out as shown in the figure, the oil flows in the small hole 20d, but the fluid resistance force when the oil flows is proportional to the flow rate. Further, since the flow rate is proportional to the speed of the piston 20c, a resistance force proportional to the speed of the piston 20c eventually acts on the piston 20c.

FIG. 3 is a conceptual view of a dashpot in which springs are provided on both sides of the piston. In the figure, 20e is a spring on the piston rod side, and 20f is a spring on the cylinder side. Spring 2
Both 0e and 20f press the piston 20c, but the piston stops when the two spring forces are balanced. In this way, the dashpot 20 functions as the springless dashpot 20 shown in FIG.
20f acts to return the piston to its original position.

Next, the operation of the embodiment will be described. When such a cargo handling device normally travels, the swing leg 3 swings in response to a change in rail span, but since the movement is gentle, the resistance of the dashpot 20 is very small,
It does not interfere with the swing.

On the other hand, when the cargo handling device rocks due to an earthquake or the like and the wheels 12 are lifted up, the swing leg 3 tries to momentarily swing, but the dashpot 20 works and a large resistance proportional to the swing speed is generated. Since the force is generated, the swing is restricted. Since the rocking period due to an earthquake or the like is 1 to 2 seconds, the floating time is short and the rocking of the rocking leg 3 is restricted during that time. Since it lands on the rail 11, it does not cause derailment. Since the rail clamp 15 fixes the rail to the rail while the cargo handling device is stopped, the swing leg structure is not necessary. Therefore, the swing leg structure of the present invention is effective for rocking during traveling. The dashpot 20
If the inner piston has springs on both sides, the spring tries to return the piston 20c to the original position, so that the swinging of the swing leg 3 is further restricted. Therefore, derailment is prevented more effectively.

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

[0018]

As described above, in the swing leg structure of the cargo handling apparatus according to the present invention, the dash pot is provided in the vicinity of the pin connecting the horizontal frame and the swing leg to restrict the rapid swing of the swing leg. Therefore, even if the cargo handling device rocks and the wheels float up, it will land on the rails without changing the angle formed by the horizontal frame and the swinging leg, so there will be no derailment and the entire device may collapse. Absent.

[Brief description of drawings]

FIG. 1 is a front view of a swing leg structure of a cargo handling device according to the present invention.

FIG. 2 is a conceptual diagram of a dashpot.

FIG. 3 is a conceptual diagram of a dashpot with a spring.

FIG. 4 is a front view of a conventional unloader.

5 is a view on arrow AA of FIG. 4. FIG.

[Explanation of symbols]

 1 Running frame 2 Horizontal frame 3 Swing leg 10 pins 11 Rail 20 Dashpot 20e Spring 20f Spring

Claims (2)

[Claims] 1. A rocking leg structure of a cargo handling apparatus, comprising a gate-shaped running frame that runs on rails, and one leg of the running frame is a swinging leg, and a horizontal frame of the running frame. A rocking leg structure for a cargo handling device, characterized in that a dashpot that connects the horizontal frame and the rocking leg to restrict sudden rocking of the rocking leg is provided near a pin connecting the rocking leg. 2. The swing leg structure for a cargo handling apparatus according to claim 1, wherein the dashpot has springs on both sides of the piston.