JPS5854834Y2 - Power supply cable shock mitigation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that prevents excessive tension from being generated in a power supply cable that is passed between two locations that are in a relative movement relationship.

The crane moves by obtaining electric power via a power supply cable provided between a power supply point on the ground and the crane.

In response to this movement, the power supply cable is paid out or wound up from a cable winding drum provided on the crane.

If the power supply point is located at the center of the crane's travel range, the cable winding drum will rotate in reverse every time the crane passes the power supply point, which will momentarily apply a large amount of tension to the power supply cable, causing damage to the power supply cable. Put it away.

Especially in recent years, as traveling speeds have increased, the instantaneous maximum tension of the power supply cable has become a problem.

The conventional solution to this problem was to create a pit underground and use a structure in which the above-ground cable clamp section was moved by a spring.

However, if such a device cannot be installed on the foundation side above ground, a cable shock mitigation device must be installed on the crane side.

An object of the present invention is to safely and efficiently prevent excessive tension in a power supply cable on the moving body side with a simple configuration.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, two guide drums 2 and 3 are attached to a crane 1 that travels in the direction of arrow A.

A power supply cable 6 is strung between a power supply point 4 on the ground and a cable winding drum 5 of the crane 1.

Each of the guide drums 2 and 3 is installed so as to sandwich the part of the power supply cable 6 in the middle of the wire.

A spring motor (not shown) constantly applies rotational force to the cable winding drum 5 to pull the power supply cable 6, and the rotational force is applied to the cable winding drum 5 by winding the slack power supply cable 6 as the crane 1 moves. Then, when the crane 1 moves in the direction away from the power feeding point 4, the power feeding cable 6 is allowed to unwind from the cable winding drum 5.

The guide drum 3 near the cable winding drum 5 side is movable in the direction of arrow A using the take-up unit 7.
The take-up unit 7 is received by a spring 8.

When the crane 1 passes the feed point 4, the feed cable 6 laterally presses the guide drum 3 due to the rapid reversal of the cable winding drum 5.

The energy is absorbed by the spring 8 and no excessive tension is applied to the power supply cable 6.

In this way, in order to prevent the generation of excessive tension in the power supply cable 6, the cable winding drum 5 reverses direction immediately after the guide drums 2, 3 pass the power supply point 4.

In this state, even if the crane 1 travels in either direction from right to left or left to right in FIG. In between, the guide drum 3 is bent at an angle close to 90 degrees, and the excessive tension on the power supply cable 6 caused by the reverse rotation of the cable winding drum can be efficiently absorbed by the spring 8 on only one side.

In addition, the power supply cable 6 is normally sandwiched between the guide drums 2 and 3, so it will not come off.Furthermore, even though the guide drum 3 separates from the guide drum 2 during shock absorption, the power supply cable 6 is attached to the lower guide lie 3. Since the part of the impact force is applied strongly, the power supply cable does not come off from the guide drum at this time, making it safe.

As described above, according to the present invention, the occurrence of excessive tension in the power supply cable on the movable body side can be prevented efficiently and with a simple configuration in any traveling direction by moving the guide drum on one side and using the shock absorber operated by the movement. Moreover, the power supply cable is securely prevented from coming off from the guide drum, resulting in a safe effect.

[Brief explanation of drawings]

FIG. 1 is an overall view of a crane employing an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts of FIG. 1... Crane, 2, 3... Guide drum, 4... Power feeding point, 5... Cable winding drum, 6... Power supply cable, 7...
...Take-up unit, 8...Spring.

Claims (1)

[Scope of utility model registration request] A power supply point on the ground is provided in the middle of the travel range of the mobile body, and the power supply cable fixed to the power supply point is wound up by a cable winding drum attached to the mobile body as the mobile body moves. Alternatively, in a feeding device, at least two cables are arranged in a position where the power supply cable is sandwiched between a part of the movable body that is away from the cable winding drum in the travel direction of the movable body.
Shock mitigation for a power supply cable, characterized in that the guide drum of the guide drums on the side closer to the cable winding drum is movably attached to the movable body via a shock absorber. Device.