JPS5821681B2 - Wire rope position determination and detection device using electromagnetic flaw detection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for identifying and detecting a plurality of specific positions on a moving wire rope or a stationary wire rope.

As shown in FIG. 1, annular magnetic poles 7 are arranged at both ends of a yoke 6 into which an excitation coil 5 connected to an AC power source 4 is fitted, so that their centers are aligned in a straight line. is fixed, and a pair of detection coils 8 having the same shape and the same number of turns is installed between each magnetic pole 7, and the wire rope 1 is connected to each magnetic pole 7.
When the wire rope 1 is run on the center line of the detection coil 8, an alternating magnetic field is applied to a predetermined section of the wire rope 1 by the AC power supply 4 via the excitation coil 5, the yoke 6, and the magnetic pole 7.

In this case, the voltage and phase of each detection coil 8 generated by the magnetic flux changing through the wire rope 1 are the same, and when connected in such a way that the potential directions cancel each other out, the potential generated at the connection end shows the difference.

For this reason, in the case of an ordinary wire rope, the voltages of each detection coil 8 are canceled out as shown in FIG. 2, so no detection signal appears.

In order to detect a specific position of the wire rope 1, a part or all of the core material 2 at that position in the wire rope 1 is removed, or a magnetic body 9 is inserted at that position without removing the core material 2. Then, signals as shown in FIGS. 3 to 5 are generated in the detection coil 8.

That is, when the magnetic body inserted portion of the wire rope 1 enters the detection coil 8, the cross-sectional area of the magnetic body 9 is added to the cross-sectional area of the wire rope, so that the magnetic flux passing through the detection coil 8 is The detection potential generated by the magnetic flux, which is larger by Δψ compared to the magnetic flux passing through a portion without magnetic material, is taken out to the outside as a detection signal without being canceled out between the detection coils 8.

Then, the signal taken out to the outside is subjected to full-wave rectification, and the relationship between this and the detection coil 8 is shown in FIG.

It is possible to detect multiple specific positions on the wire rope using such a detection method, but simply inserting multiple magnetic bodies of the same standard in the wire rope will not be able to distinguish between the multiple magnetic body insertion positions. Since the wire rope cannot be detected, it is difficult to perform various types of operational control using the wire rope.

This invention focuses on the fact that the signal generated in the detection coil can be changed by changing the magnitude of △ψ, and has completed a method that can discriminate and detect a plurality of specific positions on a wire rope, The core material 2 at a plurality of predetermined locations in the wire rope is removed, and magnetic materials having the same length and different amounts of magnetic flux passing through the inside are inserted into the core material removed portions, and the wire rope 1 and the core material 2 are inserted into the wire rope 1. By relatively moving the electromagnetic flaw detection device 3 facing the wire rope 1 in the longitudinal direction of the rope, the electromagnetic flaw detection device 3 detects the position of each magnetic body and the level difference of each magnetic body. The present invention relates to a wire rope position determination and detection method using an electromagnetic flaw detection device, which is characterized in that a plurality of specific positions are discriminated and detected.

As mentioned above, in order to obtain multiple magnetic bodies that have a constant length but differ in the amount of magnetic flux that passes through them, when using magnetic bodies made of the same material, it is sufficient to change the cross-sectional area of each magnetic body.
Further, when using magnetic bodies having the same cross-sectional area, each magnetic body may be made of a material having a different magnetic permeability.

FIG. 7 shows the relationship between an example of a wire rope with a magnetic material inserted therein used in the present invention and the detection signal level. A small magnetic permeability magnetic body 10A and a medium magnetic permeability magnetic body 10 each having the same length in the material removed portion.
B and the high magnetic permeability magnetic body 10C are inserted, and when this magnetic body inserted wire rope 1' is run along the center of the magnetic pole 7 and the detection coil 8 in the electromagnetic flaw detection device 3 as described above, the magnetic body 10A , IOB, and 10C, a signal with a level proportional to the magnetic permeability can be detected.

FIG. 8 shows the relationship between an example of a wire rope with a magnetic material inserted therein used in the present invention and the detection signal level. A small cross-sectional area magnetic body 11A and an interrupted area magnetic body 11 each having the same length are placed in the material removed portion.
B and a large cross-sectional area magnetic material 11C are inserted, and this magnetic material inserted wire rope 1' is run along the center of the magnetic pole 7 and the detection coil 8 in the electromagnetic flaw detection device 3 as described above, and the magnetic bed In the portion where 11A, 11B, and 11C are located, a signal with a level proportional to the size of the cross-sectional area can be detected.

FIG. 9 shows an example of a wire rope position determination detection control circuit in which three types of magnetic materials are inserted as shown in FIGS. 7 and 8. A level discrimination circuit 13 consisting of a Schmitt circuit is connected via an amplifier 12, and the level discrimination circuit 13 is activated by a signal when a small permeability magnetic material 10A or a small cross-sectional area magnetic material 11A is detected. A low level signal activated relay RYS, a medium level signal activated relay RYM activated by a signal when a medium speed magnetic material 10B or an interrupted area magnetic material 11B is detected, and a high magnetic permeability magnetic material 10C or a large cross section magnetic material 1C A high level signal activated relay RYL is connected to the high level signal operated relay RYL which is activated by a signal when the signal is detected.

10 to 13 show a first application example of the position determination and detection method of the present invention, in which a wire rope 1 is stretched along a crane track, and the wire rope 1
The core portions at both ends are made of magnetic materials with different amounts of magnetic flux passing through the inside, that is, a magnetic material 14A with a small amount of internally passing magnetic flux, a magnetic material 14B with a medium amount of internally passing magnetic flux, and a magnetic material 14B with a large amount of internally passing magnetic flux. A magnetic body 14C is inserted sequentially at intervals toward the end of the rope, and a position discrimination detection control device 16 shown in FIG.
is fixed, and rope guide rollers 17 are attached to both the front and rear sides thereof.

When the position discrimination detection control device 16 in the crane body 15 traveling toward the end of the rope detects a bottom level signal from the magnetic body 14A with a small amount of internally passing magnetic flux, the bottom level signal activation relay RYS activates the crane traveling device. A deceleration command is given to the magnetic body 14B, and then, when a medium level signal is detected by the magnetic material 14B with a medium amount of internally passing magnetic flux, an alarm command is given by the medium level signal activation relay RYM, and the magnetic material 14B with a large amount of internally passing magnetic flux When a high-level signal from the body 14C is detected, a stop command is given by the high-level bell signal activation relay RYL, and the vehicle is controlled so that only reverse direction travel is possible.

Next, the travel control action will be explained in detail with reference to FIG. 13.

First, when the power is turned on when the position discrimination detection control device 16 is located at the middle of the wire rope, an initial reset signal is sent to the flip-flops FF1 and F, which are memory elements.
F2 and FF3 are all reset.

Next, when the right-hand push button switch PB1 is pressed to turn it on, the crane main body 15 travels to the right.

When this running in the right direction continues and a bottom level signal is detected by the magnetic body 14A with a small amount of internally passing magnetic flux on the right side,
The two inputs to the logical product element AND1 both become 1, the output also becomes 1, and FF1 is set.

The set output terminal of this FF1 is a deceleration command.

Even if the crane main body 15 further travels to the right while being decelerated by this deceleration command and the bottom level signal disappears, this deceleration command is still stored in the flip-flop FF1.

Next, when an intermediate level signal is detected by the magnetic material 14B with an intermediate amount of internally passing magnetic flux, all three inputs of the AND element AND2 become 1, the input condition is satisfied, an output of 1 is output, and the flip-flop 7'FF2 is set.

The set-side output signal of this flip-flop FF2 is a warning command to notify that rightward travel has approached the limit, and this command signal is held by the flip-flop FF2 even if the medium level signal disappears.

When the crane main body 15 moves further to the right, a high level signal is detected by the magnetic body 14C with a large amount of internally passing magnetic flux, so AND3 satisfies the input conditions and outputs 1 and flips the flip-flop in the same way as in the previous case. FF
Set 3.

This set signal is a stop command and a rightward travel restriction signal, and when a high level signal is detected, the crane main body 15 stops.

Next, when the crane body 15 is moved to the left, the two signals, the middle level detection signal and the left direction command signal PB2, are both one, so the AMD5 outputs an output of 1 and resets the flip-flop FF3. .

If the left direction continues and a small level signal is detected, the AN
D4 outputs an output of 1 to reset the flip-flop FF2, and the timer TD outputs a signal immediately after the set time (which may be a very short time), and this signal is further converted into a short pulse by the differentiating element DIF and then output to the flip-flop. Reset FF1.

In this way, when the crane body travels from left to right, set the flip-flops in the order of FF1 → FF2 → FF3, and conversely, when travel from the right limit position to the left, set the flip-flops in the order of FF3 → FF2. →FF1
Reset in this order.

14 and 15 show a second application example of the position determination and detection method of the present invention, in which three types of wire ropes as described above are attached to the core of the hoisting wire rope 1 of the hoisting machine 18. At the tip of the boom 20 into which the magnetic bodies 14A, 14B, and 14C are inserted and which supports the head sheave 19, a position discrimination detection control device 16 and a guide sheave pair 2 shown in FIG. 9 are installed.
1 is attached, and each magnetic body 14A, 14B is attached as described above.
.

By sequentially detecting the signals from 14C, a deceleration command, an alarm command, and a stop command are sequentially given.

16 and 17 show a third application example of the position discrimination detection scattering of the present invention, in which a predetermined length is attached to the core of the wire rope 1 disposed along the trajectory of the mobile machine 22. A magnetic body 14A with a small amount of internally passing magnetic flux is inserted at each position (for example, every 1 m), and a magnetic body 14B with a medium amount of internally passing magnetic flux is inserted every 10th position, and the position discrimination detection control device 16 Detects each magnetic body 14A with a small amount of internally passing magnetic flux, and counts the detection signal with a counter.

Further, the signal generated by the magnetic body 14B having a medium amount of internally passing magnetic flux that arrives every 10th is a count signal and a count correction signal.

Next, this count correction function will be explained with reference to FIG.

The count value of the counter becomes 39 at the moment when the medium level signal is detected.
Assuming that, immediately after the set time of the timer TD (a time that can be ignored compared to the pulse interval time) has elapsed, terminals 1 and 8 of the four output terminals 1, 2, 4, and 8 of the counter A signal is coming from.

Therefore, the input condition of AND4 is satisfied and an output of 1 is output from AND4.

This signal serves as an input signal to the upper 10-digit counter, and at the same time, the 1-digit counter is reset, and the 1.2 and 4.8 output terminals are all set to zero.

In other words, round up. For example, if the count value of the counter reaches 42 at the moment when a medium level signal is detected, immediately after the set time of the timer TD has elapsed, output terminal 2 of the output terminals 1, 2, and 4.8 of the counter There is output only.

In this case, since the input condition of ANDl is satisfied, the logical sum element -mR1 and the logical product element AND
The OH2 signal is output from 3 and resets the 1 digit counter.

In other words, devaluation.

In this way, each time a medium level signal arrives, the count is rounded up or down depending on the value of the output signal of the counter, and the count is corrected.

When carrying out this invention, examples of electromagnetic flaw detection equipment include the well-known Rope Tester (trade name) and the Japanese Patent Publication No. 48-279
The type shown in No. 56 or Japanese Patent Publication No. 48-39756 can be used.

In addition, as the plurality of magnetic materials of the same material, a single strand of wire rope, an iron bar, or an aggregate of straight iron wires can be used.Furthermore, as magnetic materials with different magnetic permeability, for example, the ratio of carbon to iron can be used. You can use a modified version of .

Furthermore, four or more types of magnetic materials may be used, each having a different amount of magnetic flux passing through the inside.

According to the present invention, magnetic materials having different amounts of magnetic flux passing through the core are installed in a plurality of predetermined core portions of the wire rope 1, and the wire rope 1 and the electromagnetic flaw detection device 3 are placed relative to each other in the longitudinal direction of the rope. Since the electromagnetic flaw detection device 3 detects the position of each magnetic body and the signal level difference between the magnetic bodies, it is possible to easily and accurately identify and detect a plurality of specific positions on the wire rope 1. Therefore, the deceleration position, control position, or stop position of the hoisting rope or traction rope can be easily and accurately detected. By fixing the device to mobile machinery and equipment, effects such as being able to easily and accurately distinguish and detect a plurality of moving positions of the mobile machinery and equipment and perform various operational controls can be obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the relationship between the electromagnetic flaw detection device and the wire rope, Fig. 2 is a schematic vertical side view showing the voltage detection state of an ordinary wire rope without a magnetic material inserted, and Figs. 3 to 5 6 is a schematic longitudinal sectional side view showing the state of voltage detection of a wire rope with a magnetic material inserted therein, FIG. FIG. 8 is a diagram showing the relationship between the magnetic material inserted wire rope and the detection signal used in the present invention, and FIG. 9 is a diagram showing the position discrimination detection control circuit. 10 to 13 show a first application example of the present invention, in which FIG. 10 is a schematic plan view showing the arrangement, FIG. 11 is a front view thereof, and FIG. 12 is a partial view. Side view showing,
FIG. 13 is a control circuit diagram. Fig. 14 is a side view showing a second application example of the present invention;
The figure is a front view showing a part of it, and FIG. 16 is a third view of this invention.
A schematic side view showing an application example, and FIG. 17 is a count correction circuit diagram in a third application example. In the figure, 1 is a wire rope, 2 is a core material, 3 is an electromagnetic flaw detector, 4 is an AC power supply, 5 is an excitation coil, 6 is a yoke, 7
1 is a magnetic pole, 8 is a detection coil, 12 is an amplifier, 13 is a level discrimination circuit, 14A is a magnetic material with a small amount of internally passing magnetic flux, 1
4B is a magnetic material with a medium amount of internally passing magnetic flux, 14C is a magnetic material with a large amount of internally passing magnetic flux, 15 is the crane body, 16
17 is a position discrimination detection control device, 17 is a rope guide roller,
18 is a hoisting machine, 22 is a mobile machine, RYS is a low level signal activated relay, RYM is a medium level signal activated relay, RYL
is a high level signal activated relay.

Claims (1)

[Claims] 1 At the core of the wire rope 1 at a plurality of predetermined locations,
Installing magnetic materials with different amounts of magnetic flux passing through the inside,
The wire rope 1 and the electromagnetic flaw detection device 3 facing the wire rope are moved relatively in the longitudinal direction of the rope, and the electromagnetic flaw detection device 3 detects the position of each magnetic body and the signal level difference of each magnetic body. A wire rope position determination and detection method using an electromagnetic flaw detection device, characterized in that a plurality of specific positions on the wire rope 1 are discriminated and detected by the following.