JPS6117741B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a reel cable winding defect detection device, and more particularly to a reel cable winding defect detection device suitable for use in a group of captire cables connected to a yard machine. Conventionally, mobile machines such as stackers, reclaimers, and cranes have been operated manually by an operator in a cab while constantly monitoring the surrounding conditions. However, in recent years, automation has progressed, and once the initial settings have been made, subsequent operation is performed according to a predetermined automatic operation program, or it can be controlled remotely while being monitored from a yard center using an industrial TV or the like. methods are beginning to be used. However, none of these methods allows an operator to visually check the operating status as in the conventional method. For this reason, even if the reel cable is damaged due to malfunction of the brake of the cable winding device installed in the yard machine, failure of the electric motor, breakage of the drive chain, etc., it has been overlooked. Additionally, to compensate for the drawbacks of visual inspection, conventional cable winding devices are equipped with an overtension detector that detects when excessive tension is applied to the cable. However, such detectors have the disadvantage that they are only effective when the cable is under tension, and are ineffective when the cable is slack. SUMMARY OF THE INVENTION An object of the present invention is to provide a reel cable winding defect detection device that can prevent cable damage caused by excessive tension being applied to the cable or cable loosening. In order to achieve the above object, the present invention has one end of a cable fixed and the other end wound around a reel mounted on a mobile device, and the cable is unwound or unwound as the mobile device moves. In the reel cable winding device for taking up the reel cable, a first detector generates a signal corresponding to the rotation of the reel;
a second detector that generates a signal corresponding to the rotation of the reel with a time difference with respect to the output of the detector; and a second detector that detects the rotation direction of the reel based on the output signals of the first and second detectors. A rotational direction detection means for determining the rotational direction, and outputting an abnormal signal when the rotational direction of the reel detected by the detection means is different from the normal rotational direction of the reel determined by the positional relationship with respect to the fixed end of the cable of the mobile device and the moving direction. A rotational speed abnormality detecting means for detecting an abnormality in the rotational direction and detecting that the rotational speed of the reel has abnormally increased or decreased based on the generation interval of output signals of the first and second detectors and outputting an abnormality signal. and detecting means, which stops the movement of the moving device when at least one of the abnormal signals is output, thereby quickly detecting a defective reel winding and immediately stopping the moving device. This is intended to prevent damage to the cable due to excessive tension or slack. FIG. 1 is an explanatory diagram showing the principle of the present invention. Power is supplied to the yard machine via cables extending from each reel from a cable supply point S provided in the center of the track bed. As shown in FIG. 1, the reels R _S and R _N attached to the yard machine moving south and north of the track bed rotate in opposite directions depending on the direction of movement. That is, under normal conditions, the reel R _S is rewound when moving southward, and taken up when moving northward. Conversely, when the reel R _N moves northward, it rewinds, and when it moves southward, it winds up. Therefore, when a rotational state different from this is shown, it means that there is a winding abnormality. Therefore, the present invention detects this rotational state by operating a proximity switch provided on the reel, and processes this detection signal to obtain a running stop signal. FIG. 2 is a perspective view of the reel structure according to the present invention, and FIG. 3 is a front view of the reel. The reel 2 on which the cable 1 is wound is driven by the driving force of a motor 5 applied to a gear 3 provided on one side via a chain 4. motor 5
The movement of the yard machine is controlled by a control device (not shown). A current collector 6 is provided on the other side of the reel 2, and the power or information signal supplied from the cable feed point is taken off by means of a brush from a rotating current collector ring. Such a winding device is provided with a detection mechanism for extracting rotation information. That is, adjacent bodies (iron plates) 21, 22, 23, 24 are placed at four locations on the side surface of the reel 2.
are provided, and two proximity switches NLS1 and NLS2 are provided fixed at positions corresponding to these proximity objects to constitute a detection mechanism. As a result of the rotation of the proximity bodies 21 to 24 as the reel 2 rotates, pulse signals corresponding to the rotation are generated in the proximity switches NLS1 and NLS2. In this case, the proximity switch NLS
NLS 1 and NLS 2 are installed at positions such that they do not detect the same proximate object at the same time. The outputs of these proximity switches are processed by the control circuit 7. FIG. 4 is a circuit diagram of the control circuit. The control circuit is NOT circuits 71, 72, and differentiation circuit 7.
3, 74, rotation direction detection means consisting of AND circuits 77, 78 and flip-flop 80; rotation speed abnormality detection means for detecting an abnormal decrease in the number of reel rotations consisting of differentiating circuits 75, 76, OR circuit 79, and timer 81; AND circuits 82, 83, 84, 8 forming a rotational speed abnormality detection means for detecting an abnormal increase in the reel rotation speed consisting of a monostable multivibrator 96 and a timer 97, and a rotational direction abnormality detection means.
5, voltage conversion elements 86, 87, 88, 89,
NOR circuit 90, diodes 91, 92, 93,
It consists of a NOR 94, a timer 95, an amplifier circuit 98, and a relay 99. The respective output signals of the proximity switches NLS1 and NLS2 are inputted to NOT circuits 71 and 72 and inverted, and then applied to each of differentiating circuits 73 and 74, and become one input signal of each of AND circuits 77 and 78. Another NLS output was applied as the other input signal of each AND circuit 77, 78.
AND is taken. The outputs of the AND circuits 77 and 78 serve as set and reset signals for the flip-flop 80, and the outputs are used to perform a logical sum with the north-south position signal and the driving direction signal. On the other hand, the south position, north position,
The output from each detector while traveling south and north is subjected to waveform processing by voltage conversion elements 86 to 89.
Added to AND circuit group. Also, NLS1 and
NLS2 is applied to differentiating elements 75 and 76, respectively, to generate differential signals, which are applied to OR circuit 79 together with the outputs of differentiating circuits 73 and 74. Furthermore, OR circuit 79
The output is applied to a timer 81, and the output is turned off after a certain period of time has passed after the input disappears. The output of this timer 81 becomes one input signal of four AND circuits 82 to 85. The AND circuit 82 has four input signals, namely the Q terminal output of the flip-flop 80 (AND circuit 77
output of the timer 81, voltage conversion element 86,
Each of the 88 outputs is input, and the logical sum of these is output. Similarly, the AND circuit 83 operates based on the Q terminal output of the flip-flop 80, the output of the timer 81, and the outputs of the voltage conversion elements 87 and 89.
The AND circuit 84 includes the Q terminal output of the flip-flop 80 (when the output is generated in the AND circuit 78, it becomes a "1" level output), the output of the timer 81,
Based on each of the outputs of voltage conversion elements 88 and 87, AND circuit 85 converts the Q of flip-flop 80.
Terminal output, output of timer 81, voltage conversion element 8
A logical sum is output based on each of the outputs of 6 and 89. Also, both outputs of voltage conversion elements 88 and 89 are
applied to the NOR element 90, and both inputs are “0”
When the signal is at the level, an output level of "1" is generated. The outputs of the AND circuits 82 to 85 and the NOR circuit 90
The output of is applied to a NOR circuit 94, which generates a "1" output level only when all input signals are all "0" levels. In this case, since the NOR circuit 94 is a three-input type, the AND circuits 84, 85,
Diodes 91 and 9 are connected to each output of the NOR circuit 90.
2 and 93 and send these outputs to the NOR circuit 9.
By connecting to one input terminal of 4, an OR circuit is formed and multi-signal input processing is attempted. In addition,
A NOR circuit 90 is provided to provide an interlock during stoppage. The output of the NOR circuit 94 is applied to a timer 95, which generates an output signal after a certain period of time after the signal is input. This timer 95 is used to take up slack when starting and stopping the reel, and to clip each time of stopping winding when passing the center point, and is
A delay of seconds is set. On the other hand, the output of NLS1 is input to a monostable multivibrator 96 to generate a constant width signal, and an on-delay timer 9
7. This system is for detecting the occurrence of abnormally high speed rotation, but it is necessary to keep the output pulse width of the monostable multivibrator 96 smaller than the time T ₃ of the timer 97. In other words, the waveform at each point in Fig. 4 is the 5th waveform.
As shown in the figure, if the above-mentioned time relationship is satisfied, no output pulse is generated at the point (output of timer 97) during normal operation. However, when an abnormality occurs, the reel rotates faster, and the waveform at each point becomes as shown in FIG. That is, the first input signal (pulse) is the monostable multivibrator 96
Since the pulse point enters the next pulse point before the output (point) of the malte vibrator 96 disappears, the point continues to be at the "1" level, and an output is generated at the point after T ₃ hours have elapsed. This will generate an abnormal signal. This output is taken into the amplifier 98 via the OR circuit in the amplifier 98, and after the required amplification is performed, the relay 99 is energized.
The contact 991 is closed to form a travel stop signal circuit. Note that the output of the timer 95 is also taken in via the OR circuit in the amplifier 98, and thereafter drives the relay 99 through the same path as in the above case. The operation in this case will be described in detail below. In the non-rotating and unwinding state, the waveforms at each point in FIG. 4 are as shown in FIG. 7. When the rotation is normal, the timer 81 is activated as shown in Figure 7.
The output point of is always at the "1" level in response to the input from the proximity switch. However, when not rotating, the pulse waveform at each point becomes a discontinuous output waveform, and after the time _T1 preset in the timer 81 has elapsed, the point becomes "0" level and a stop signal is generated. become. Next, detection of the rotation direction will be described in detail. If the order of generation of output signals from the proximity switch is NLS2→NLS1 during forward rotation, the output waveforms at each point in FIG. 4 will be as shown in FIG. 8. By setting the output pulse widths t ₇₃ and t _{74 of the differentiating circuits 73 and 74} to be sufficiently smaller than the signal pulse widths P ₁ and P ₂ of the proximity switches NLS1 and NLS2, the output (and point) of the flip-flop 80 is always on the Q terminal side. appears only in However, at the time of reversal, the output signal generation order from the proximity switch changes from NLS1 to NLS2, the above-mentioned signal generation is reversed between the NLS1 side and the NLS2 side, and the output of the flip-flop 80 always appears only on the Q terminal side. Therefore, the direction of rotation can be determined depending on which of the output terminals of flip-flop 80 the output signal is generated. The rotation direction of the reel and the position of the yard machine are assumed to be as specified in Table 1.

[Table] If we were to show the operation of AND circuits 82 to 85 for "traveling north on the north road bed", it would be as shown in Table 2 (however, H = "1" level, L =
(means “0” level). Table 2 shows the case under normal conditions, and if an abnormality occurs and even one AND condition of the AND circuit 83 is missing, an output will be generated in the NOR circuit 94 (H level).
A travel stop signal will be output. As is clear from the above, according to the present invention, in view of the fact that the normal rotational direction of the reel is determined by the position and movement direction of the moving device, the rotational direction of the reel is detected, and when the rotational direction is different from the normal rotational direction, the reel is unwound. In addition to determining an abnormality, an abnormal increase in the rotational speed of the reel, which is indicated by cable slack, and an abnormal decrease in the rotational speed of the reel, which may cause excessive tension to be applied to the cable, are detected and determined to be a winding abnormality. This makes it possible to accurately and quickly detect defects in reel winding, and thereby prevent damage to the cable caused by loosening of the cable when excessive tension is applied to the cable. can. Furthermore, specifically, the accompanying effects listed below can be obtained.

[Table] (1) It is possible to prevent the cable from being cut by the running wheels when the captire cable is loose, or from being caught by nearby structures. (2) By being able to prevent cable breakage, it is possible to prevent the aircraft from running out of control. (3) By being able to detect abnormalities in the cable winding device early, it is possible to extend the life of the cable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the principle of the present invention, FIG. 2 is a perspective view of a reel device according to the present invention, FIG. 3 is a plan view of a reel according to the present invention, and FIG. 4 is a diagram of a control circuit according to the present invention. Circuit diagrams, Figures 5, 6, 7 and 8
The figure is a waveform diagram showing the operation of each part of the control circuit of FIG. 4. 1... Cable, 2... Reel, 7... Control circuit, 21, 22, 23, 24... Proximity body, 73,
74, 75, 76... Differential circuit, 77, 78, 8
2, 83, 84, 85...AND circuit, 79...
OR circuit, 80...Flip-flop, 81...
Timer, 90, 94...NOR circuit, 99...
Relay, NLS1, NLS2... Proximity switch.

Claims (1)

[Claims] 1. A reel cable winding device in which one end of a cable is fixed and the other end is wound around a reel mounted on a mobile device, and the cable is rewound or wound as the mobile device moves, a first detector that generates a signal corresponding to the rotation of the reel; a second detector that generates a signal corresponding to the rotation of the reel with a time difference with respect to the output of the first detector; a rotational direction detection means for determining the rotational direction of the reel based on the output signals of the first and second detectors, and a positional relationship between the rotational direction of the reel detected thereby and the fixed end of the cable of the mobile device; rotational direction abnormality detection means for outputting an abnormality signal when the rotational direction is different from the normal rotational direction of the reel determined by the moving direction; and a rotational speed of the reel based on the generation interval of the output signals of the first and second detectors. rotational speed abnormality detection means for detecting an abnormal increase or decrease in rotation speed and outputting an abnormal signal, and stopping movement of the mobile device when at least one of the abnormal signals is output. A reel cable winding defect detection device featuring: