JPS5852184A - Method of protecting feed cable of moving body - 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 running lane having a branch point for a power supply cable on the ground.

Conventionally, as shown in FIG. 1, at a power supply cable branch point, a link mechanism 2 is used to throw a buffer spring 3 onto a cable clamp 1a portion of a power supply cable l, and the cable tension is transmitted through a guide roller 4. A method was adopted in which the fluctuation of the spring was alleviated by compressing the spring 3 using a link morsilon. but.

It is not enough to sufficiently alleviate the shocking cable tension that occurs when the crane passes the power cable branch point 5 at high speed so as not to cause cable damage! there were. That is, when attempting to pass through the branch point 5 at high speed in the direction of arrow A in FIG. 2, the number of the cable 1 on the cable winding reel 1b does not match and the cable 1 changes from the state shown in FIG. 2 to the state shown in FIG. 113. This causes a slack 6, and after passing the first branch point 5, this slack 6 is suddenly pulled, resulting in a large cable tensile force.

The object of the present invention is to sufficiently prevent damage to the power supply cable due to the large cable tensions that occur when a crane passes through the branch point of the power supply cable.

The key point of the present invention is to install a buffer spring in the cable clamp part, and to increase the torque of the control torque motor for cable winding near the power supply cable branch point, and in addition to the buffering effect of the spring, the branch When passing the point, the slack in the cable is removed by ILI using the high torque of the motor □-.
The point is to eliminate Ih.

Hereinafter, one embodiment of the present invention will be described with reference to each of the figures from FIG. 4 to FIG. 7.

A limit switch 9 installed on the reel 8 that winds the crane 70 cable 13 is shown in FIG.
detects the cable winding length, and when the cable is within a distance L from the branch point 5 of the power supply cable, the reel 8 rotates, the torque value 11 of the control torque motor 22 increases to 12, and the cable 13 is rotated. Eliminate slack.

In addition, the spring 15 for relaxation installed at the cable clamp 19 can weaken the sudden cable tension when the crane 7 passes directly above the power supply cable branch point 5.

FIG. 6 shows a detailed view of the limit switch 9, with the lever 1 attached to the cable 13 wound up within the reel 8.
4 is attached to the C bracket 17 via the rotation fulcrum 24, and the striker 16 at the rear end of the lever 14 is turned on by turning the limit switch 9 installed on the bracket 17.

A spring 23 is installed between the lever 14 and the bracket 17 that can be turned off so that the lever 54 always presses against the cable 13.

The block diagram of the control mechanism is shown in FIG. 6. The ON operation timing of the limit switch 9 is set so that it turns ON when the cable is removed from the power supply cable branch point 5 by 13%, and the ON signal S Send it to control@f120 and control! A signal S is sent from the controller 20 to the control torque motor 22 that rotates the reel 8 to increase the rotational torque T.

Figure 7 shows a detailed view of the cable clamp section.

The cable 13 attached to the reel 8 by 1# is fixedly supported by a cable clamp 19 via a cable clamp 18 on the ground. The second spring 15 is interposed between the cable clamp 19 and a bracket 21 which projects horizontally and is fixed at the branch point 5. For this reason, when the cable 13 is pulled upward in FIG. 7, the spring 15 is compressed via the cable clamp 19, so that the tension on the cable is alleviated.

According to this embodiment, as the crane 7 moves and feeds the cable 13 into the reel 8, the winding diameter of the cable 13 gradually increases. With this increase in diameter, the end of the lever 14, which is pressed against the cable 13 by the force of the lever 230, rotates upward about the rotation fulcrum 24. For this reason, the striker 16 formed at the other end of the lever 14 rotates in the direction in which the switch lever of the limit switch 9 is pushed down (from the single line position to the solid line position 1 direction in FIG. 5). Then, when the crane 7 moves to the distance from the first branch point 5 to the inside of L and winds the cable 13 into the reel 8, the rotation of the lever 14 is proportional to the amount of e**- The motor rotates for a long time until the switch lever of the limit switch 9 is pushed down until the limit switch 9 is turned ON. When the limit switch 9 is turned on, the ON signal 8 is sent to the control device j20.
The second input causes the control @f120 to send the generated torque value ll (
Therefore, the reel 8 quickly winds up the cable 13 with a larger rotational force than before, causing the reel 8 to quickly wind the cable 13
This can prevent sagging from occurring. Therefore, an excessive cable tensile force generated as a reaction due to slack in the cable 13 after passing through the branch point 5 is prevented, and the tensile force on the cable 13 is also alleviated by the spring 15, so that the cable is further tightened. The tensile force relaxation effect is improved. When the crane 7 passes the branch point 5 and moves away to the opposite side by a distance exceeding L, the lever 14 is reversed, the limit switch 9 is set to 0PFL, the reel 8 is controlled to rotate with the normal torque value 11, and the normal state is maintained. It becomes quiet. The same applies when the crane 7 is sent backwards.

The high/low switching of the torque generated by the torque motor 22 can be performed automatically and with accurate timing by switching the above-mentioned limit switch 9 ON timing. Another method is to visually measure the moment when the torque generated by the torque motor 22 enters the travel area where the cable 13-2 slack lives, and use this as the switching timing, and manually switch the torque generated by the torque motor 220 to the high torque side. Also good.

Regardless of the torque switching method, the torque is set to high even before slack occurs, and unnecessary tension is not applied to the cable 13, thereby improving economical efficiency.

As described above (according to the present invention), it is possible to prevent the cable from sagging in the vicinity of the power supply cable branching point, thereby preventing the cable tension from becoming excessive, and furthermore, it is possible to prevent the cable tension from becoming excessive. The newly developed safety spring can alleviate the excessive tension that occurs when the crane passes directly above the power supply cable branch point, which has the effect of sufficiently preventing excessive tension on the cable and preventing damage to the cable. It will be done.

[Brief explanation of the drawing]

Is Figure 1 a conventional cable tension relaxation device? 2 is a diagram showing the state of the cable in a normal tensioned part, FIG. 3 is a diagram showing the state of the cable in a slack state, and FIG. 4 is an embodiment of the present invention. Relationship diagram between cable handling *H and cable winding reel drive control motor torque,
5 is an enlarged view of the cable winding reel shown in FIG. 4, FIG. 6 is a control block diagram of the torque motor for drive control of the cable winding reel shown in FIG. 4, and FIG. This is an enlarged view of the cable branch point in Figure 7. Crane, 8.
Reel, 9 Limit switch, 11.12...
...Torque value, 13...Cable, 14...
... Lever, 15 ... Spring, 16 ...
...Striker-11?・・・・・・Bracket, 19
... Cable clamp, 20 ... Control device, 22 ... 4 Torque motor agent Patent attorney Susuki 1) J'1 Figure 31-2 Figure 1'3 Figure 4 Figure 'is figure off m3

Claims (1)

[Claims] 1. A moving object equipped with a reel that is rotationally driven by a motor.
In the method of taking the power supply cable supported by a spring on the ground to the ITle reel, in the traveling area of the moving body where slack occurs in the cable in Item 111, the torque continuously generated by the motor in Item IIJ outside the traveling area is affected. A method for protecting a power supply cable for a moving body, characterized by a rivet that outputs high torque from the motor to take up the slack.