WO2011111184A1

WO2011111184A1 - Core wire contact detection device, core wire contact detection method, and core wire contact detection program

Info

Publication number: WO2011111184A1
Application number: PCT/JP2010/053994
Authority: WO
Inventors: 高志奥谷; 悦朗西田; 正谷口; 哲也矢野
Original assignee: 新明和工業株式会社
Priority date: 2010-03-10
Filing date: 2010-03-10
Publication date: 2011-09-15
Also published as: WO2011111238A1; CN102742105A

Abstract

Disclosed is a core wire contact detection device which detects contact between a strip blade and a core wire when the cover of a wire is being striped with a strip blade. The core wire contact detection device is provided with: a vibration detection unit which can detect the vibration within a frequency range containing the vibration frequency generated when the core wire of a wire comes into contact with a strip blade; and a contact state determination processing unit which determines whether or not a periodical contact determination standard is satisfied for each determination period on the basis of vibration detection signals inputted by means of the vibration detection unit, and which determines whether or not the strip blade has come into contact with the core wire on the basis of the periodical determination results.

Description

Core wire contact detection device, core wire contact detection method, and core wire contact detection program

This invention relates to a technique for detecting contact between a strip blade and a core wire when stripping a coating of an electric wire.

Normally, the wire coating is stripped using a strip blade. When the strip blade cuts into the coating of the electric wire, if the strip blade comes into contact with the core wire, the core wire is damaged.

Conventionally, Patent Document 1 discloses a technique for detecting contact between a strip blade and a core wire when stripping a coating of an electric wire.

In Patent Document 1, contact between the strip blade and the core wire of the electric wire is detected by detecting the presence or absence of conduction between the strip blade and the core wire of the electric wire when stripping the coating of the electric wire.

JP-A-6-253430

However, in the technique disclosed in Patent Document 1, in order to detect the presence / absence of conduction between the strip blade and the core of the electric wire, it is necessary to electrically connect the inspection electrode to the core of the electric wire at a portion other than the strip portion. Therefore, how to connect is an important issue. In particular, in order to perform the above-described contact detection with respect to the electric wire cut and cut to a predetermined length, it is necessary to electrically connect an inspection electrode to the core wire for each of the cut electric wires. It was scarce.

Therefore, an object of the present invention is to make it possible to more easily detect contact between a core wire and a strip blade when stripping a coating of an electric wire.

In order to solve the above-described problem, a first aspect is a core wire contact detection device that detects contact between a strip blade and a core wire when stripping the coating of the electric wire with a strip blade. Based on a vibration detection unit capable of detecting vibrations in a frequency range including a vibration frequency generated by the contact of the two and a vibration detection signal input from the vibration detection unit, whether or not a contact determination criterion for each period is satisfied for each of a plurality of determination periods A contact state determination processing unit that determines whether or not there is contact between the strip blade and the core wire based on a determination result for each period.

A 2nd aspect is a core wire contact detection apparatus which concerns on a 1st aspect, Comprising: When the said contact state determination process part exceeds the energy threshold value preset for the vibration energy amount for every period which the said vibration detection signal represents In addition, it is determined that the contact criterion for each period is satisfied.

A 3rd aspect is a core wire contact detection apparatus concerning the 1st or 2nd aspect, Comprising: As for the said contact state determination process part, the number which satisfy | fills the said contact determination criteria for every period exceeds the preset contact determination number Sometimes, it is determined that there is contact between the strip blade and the core wire.

A fourth aspect is the core wire contact detection device according to any one of the first to third aspects, wherein the plurality of determination periods include a period during which the strip blade cuts into the electric wire. .

A fifth aspect is the core wire contact detection device according to any one of the first to fourth aspects, wherein the plurality of determination periods are periods after the strip blade cuts into the electric wire and stops. Is included.

A sixth aspect is the core wire contact detection device according to any one of the first to fifth aspects, wherein the plurality of determination periods include a strip blade cut into the electric wire on the end side of the electric wire. A period for removing the coating by relative movement is included.

A seventh aspect is the core wire contact detection device according to any one of the first to sixth aspects, wherein the vibration detection unit is a resonance type AE sensor having a resonance frequency in a range of 100 kHz to 300 kHz. .

An eighth aspect is a core wire contact detection device according to any one of the first to seventh aspects, wherein a pair of strip blades that can be cut into a sheath of an electric wire, and the pair of strip blades are moved toward and away from each other. And a blade driving section.

A ninth aspect is the core wire contact detection device according to the eighth aspect, wherein the vibration detection unit is provided so as to contact at least one of the pair of strip blades.

A tenth aspect is a core wire contact detection method for detecting contact between a strip blade and a core wire when stripping the coating of the wire with a strip blade, and includes (a) a process of cutting the strip blade into the electric wire. Performing a strip process; (b) detecting a vibration in a frequency range including a vibration frequency generated by the contact between the core wire of the electric wire and the strip blade in the step (a); and (c) detecting the detected vibration. And determining whether or not a contact criterion for each period is satisfied for each of a plurality of determination periods, and determining whether or not there is contact between the strip blade and the core wire based on a determination result for each period.

In the eleventh aspect, when stripping the coating of the electric wire with the strip blade, vibration in a frequency region including a vibration frequency generated by contact between the core wire of the electric wire and the strip blade is detected, and the strip blade is based on the vibration detection signal. A core wire contact detection program for determining whether or not there is contact between the core wire and the computer, (A) based on the vibration detection signal, whether or not a contact criterion for each period is satisfied for each of a plurality of determination periods And (B) a core wire contact detection program for realizing the step of determining the presence or absence of contact between the strip blade and the core wire based on the determination result for each period in the step (A).

According to the first to eleventh aspects, when the strip blade contacts the core wire, the vibration at that time is detected through the vibration detection unit. And based on the vibration detection signal input from a vibration detection part, the presence or absence of a contact with a strip blade and a core wire can be determined. Thereby, when stripping the coating of the electric wire, it is possible to easily detect the contact between the core wire and the strip blade.

Moreover, vibration due to contact between the strip blade and the core wire is observed to some extent continuously. Therefore, based on the vibration detection signal, to determine whether or not to meet the contact criteria for each period for a plurality of periods, by determining the presence or absence of contact between the strip blade and the core wire based on the determination results for each period, The presence or absence of contact between the core wire and the strip blade can be determined more accurately.

According to the second aspect, it is possible to determine the possibility of contact between the core wire and the strip blade for each period based on the magnitude of the vibration energy amount due to noise when the strip blade and the core wire contact each other.

According to the third aspect, the possibility of contact between the core wire and the strip blade for each period can be determined based on the magnitude of the vibration energy amount due to noise when the strip blade and the core wire contact each other and the continuation state thereof.

By the way, if the strip blade contacts the core wire when cutting into the electric wire, a relatively large vibration is detected. Therefore, as in the fourth aspect, when the plurality of determination periods include a period in which the strip blade cuts into the electric wire, it is possible to more accurately determine whether or not the strip blade and the core wire are in contact with each other.

Moreover, even when the strip blade is stopped, vibration due to contact between the strip blade and the core wire is observed. In addition, when the strip blade is stopped, noise generation due to other factors is suppressed. Therefore, as in the fifth aspect, the plurality of determination periods include a period after the strip blade is cut into the electric wire and stopped, thereby more accurately determining whether or not the strip blade and the core wire are in contact with each other. Can be determined.

Furthermore, even when the strip blade removes the coating, if the strip blade and the core wire are in contact with each other, vibrations are observed. Therefore, as in the sixth aspect, the plurality of determination periods include a period when the strip blade cut into the electric wire moves relative to the end side of the electric wire to remove the covering, The presence or absence of contact between the strip blade and the core wire can be determined more accurately.

In addition, the frequency of vibration generated by contact between a strip blade made of metal and a core wire made of metal is usually easily observed within a range of 100 kHz to 300 kHz. Therefore, as in the seventh aspect, the contact between the core wire and the strip blade can be detected more reliably by using a resonance type AE sensor having a resonance frequency in the range of 100 kHz to 300 kHz as the vibration detection unit.

According to the eighth aspect, it is possible to strip the covering of the electric wire while easily detecting the contact between the core wire and the strip blade.

According to the ninth aspect, since the vibration detector is in contact with the strip blade, the contact between the strip blade and the core wire can be detected more reliably.

It is a schematic side view which shows an electric wire strip processing apparatus. It is explanatory drawing which shows a strip blade and an electric wire. It is explanatory drawing which shows the state which the strip blade cut normally into the electric wire. It is explanatory drawing which shows the state which the strip blade contacted the core wire. It is a block diagram which shows the hardware constitutions of a contact state determination process part. It is a functional block diagram of a contact state determination processing unit. It is a flowchart which shows the contact state determination process by a contact state determination process part. It is a figure which shows the example of a time-dependent change of the amplitude waveform and the moving speed of a strip blade, and the example of a determination range. It is explanatory drawing which shows the cutting state of arrow A1 in FIG. It is explanatory drawing which shows the cutting state of arrow A2 in FIG. It is explanatory drawing which shows the cutting state of arrow A3 in FIG. It is a figure which shows the example of an amplitude waveform when a strip can be performed normally. It is a figure which shows distribution of the vibration energy amount when a strip can be performed normally in order of time. It is a figure which shows the example of an amplitude waveform when external noise mixes. It is a figure which shows distribution of the vibration energy amount when an external noise mixes in time order. It is a figure which shows the example of an amplitude waveform when a damage | wound generate | occur | produces in a core wire. It is a figure which shows distribution of the vibration energy amount when a damage | wound generate | occur | produces in a core wire in time order.

Hereinafter, the wire strip processing apparatus including the core wire contact detection apparatus according to the embodiment will be described.

FIG. 1 is a schematic side view showing a wire strip processing apparatus 10. The wire strip processing device 10 includes a wire strip unit 12 and a core wire contact detection device 40.

The electric wire strip unit 12 is a device for peeling the coating Wb at the end of the electric wire W, and a pair of

strip blades

14A and 14B, a blade driving unit 16, an electric wire holding unit 20, and a coating removal driving unit 22. And.

The pair of

strip blades

14A and 14B are formed in a blade shape that can be cut into the coating Wb of the electric wire W. An insulating resin member made of polyvinyl chloride or the like is used for the covering Wb. Here, the tip portions of the pair of

strip blades

14A and 14B are formed in a V-shaped blade shape that is recessed in a substantially V shape (see FIG. 2). And the V-shaped blade-shaped part is formed so as to be able to be cut into the coating Wb of the electric wire W (see FIG. 3). In addition, the shape of

strip blade

14A, 14B is not restricted to the said example, For example, a substantially circular arc-shaped concave blade shape may be sufficient.

The blade driving unit 16 is configured to be able to move the pair of

strip blades

14A and 14B closer to and away from each other. Here, the blade drive unit 16 includes a pair of

blade support portions

17A and 17B, a screw portion 18 that movably supports the

blade support portions

17A and 17B, and a motor 19 that rotates the screw portion 18. .

The screw portion 18 is arranged along a predetermined direction (here, the vertical direction), and is rotatably supported around its central axis. A thread groove along a predetermined spiral direction is formed in one end side portion 18a of the screw portion 18, and a thread groove along a reverse spiral direction is formed in the other end side portion 18b of the screw portion 18. .

The motor 19 is configured by a motor capable of driving and controlling the rotation amount such as a servo motor, and is arranged in a manner capable of transmitting the rotational driving force to the screw portion 18. Here, the drive shaft portion of the motor 19 is directly connected to the screw portion 18. And according to the rotational drive of the motor 19, the screw part 18 is comprised so that rotation in the forward / reverse direction is possible.

The pair of

blade support portions

17A and 17B are formed as long members, and the

strip blades

14A and 14B are fixedly supported at the respective tip portions. In addition, a threaded portion 17Aa that can be screwed with the one end side portion 18a of the screw portion 18 is formed at the base end portion of the one blade support portion 17A, and the base end portion of the other blade support portion 17B is formed at the base end portion. A threaded portion 17Ba that can be threadedly engaged with the other end portion 18b of the threaded portion 18 is formed.

Then, the threaded portion 17Aa of one blade support portion 17A is screwed to the one end side portion 18a of the screw portion 18 in a posture in which the tip portions of the pair of

strip blades

14A and 14B are opposed to each other, and the other blade support portion The threaded portion 17Ba of 17B is threadedly engaged with the other end portion 18b of the threaded portion 18. In this state, the motor 19 is controlled to rotate in the forward direction or the reverse direction, so that the pair of

strip blades

14A and 14B can be moved closer to or away from each other.

However, the blade driving unit is not limited to the above-described configuration, and may be configured to be driven by an air cylinder, a hydraulic cylinder, a linear motor, or the like, and is configured to separately drive the pair of

strip blades

14A and 14B. May be.

The electric wire holding part 20 is configured to hold the electric wire W in a posture in which the end of the electric wire W is disposed between the pair of

strip blades

14A and 14B. As such an electric wire holding part 20, for example, a known chuck mechanism that opens and closes a pair of gripping claws by driving an actuator such as an air cylinder or a hydraulic cylinder can be used. In short, the electric wire can be held. A configuration can be employed.

The sheath removal drive unit 22 is configured as a mechanism that imparts a motion to remove the sheath Wb at the end of the wire W by moving the pair of

strip blades

14A and 14B and the wire holding portion 20 in the separating direction. . Here, the coating removal drive unit 22 is configured by an actuator such as an air cylinder or a hydraulic cylinder, and is configured to move the wire holding unit 20 in a direction in which the wire holding unit 20 is separated from the pair of

strip blades

14A and 14B. ing.

The electric wire strip unit 12 strips the coating Wb at the end of the electric wire W as follows under the control of the strip processing control unit 28.

That is, with the pair of

strip blades

14A and 14B moved away from each other, the end portion of the electric wire W is disposed between the pair of

strip blades

14A and 14B, and the electric wire W is held by the electric wire holding portion 20 ( (See FIG. 2). In this state, the pair of strip blades 14 </ b> A and 14 </ b> B are moved closer to each other by driving the blade driving unit 16. Then, the V-shaped blade-shaped portion cuts into the covering Wb in a state where the core wire Wa is disposed in a region surrounded by the V-shaped blade-shaped portions of the pair of

strip blades

14A and 14B (see FIG. 3). As described above, when the pair of

strip blades

14A and 14B and the electric wire holding unit 20 are moved in the separation direction by driving the coating removal driving unit 22 with the V-shaped blade-shaped portion cut into the coating Wb, the coating is performed. A portion of Wb on the tip side from the V-shaped blade-shaped portion is removed from the portion of the electric wire W held by the electric wire holding portion 20 so that the core wire Wa is exposed at the end portion of the electric wire W. The above operation is performed based on an operation signal given from the strip processing control unit 28 to the wire strip unit 12. In this operation signal, a command related to the operation control of the pair of

strip blades

14A and 14B, for example, a drive start command for the pair of

strip blades

14A and 14B, a state in which the pair of

strip blades

14A and 14B are cut into the coating Wb. The target position command according to the position to be stopped is included. This operation signal is input to the contact state determination processing unit 50 described later as a signal representing the operation timing of the pair of

strip blades

14A and 14B.

Here, when the pair of

strip blades

14A and 14B cut into the coating Wb, the pair of

strip blades

14A and 14B may come into contact with the core wire Wa (see FIG. 4). If the

strip blades

14A and 14B come into contact with the core wire Wa, the core wire may be damaged or the core wire may be broken, which may cause contact failure or disconnection.

The core wire contact detection device 40 is configured as a device that detects the contact between the

strip blades

14A and 14B and the core wire Wa when the coating Wb of the electric wire W is stripped by the

strip blades

14A and 14B as described above.

That is, the core wire contact detection device 40 includes a vibration detection unit 42 and a contact state determination processing unit 50.

The vibration detector 42 is configured to be able to detect vibrations in a frequency range including a vibration frequency generated by contact between the core wire Wa and the

strip blades

14A and 14B.

That is, when the core wire Wa and the

strip blades

14A and 14B come into contact with each other and the core wire Wa is damaged such as scratches, an AE wave is generated by AE (Acoustic Emission). Therefore, the vibration detection unit 42 is configured to be able to detect vibrations in a frequency range including the vibration frequency of the AE wave due to contact between the core wire Wa and the

strip blades

14A and 14B. In the present application, the vibration frequency generated by contact between the core wire Wa and the

strip blades

14A and 14B means a vibration frequency in a main range generated by the contact or a main specific vibration frequency generated by the contact. Yes.

Usually, the core wire Wa is made of metal, and the

strip blades

14A and 14B are also made of metal. An AE wave generated by metal destruction is easy to observe with little attenuation in the range of 100 kHz to 300 kHz. For this reason, it is preferable that the vibration detector 42 can detect vibrations in a frequency range that partially or entirely overlaps the range of 100 kHz to 300 kHz. More preferably, it is preferable that the vibration detection unit 42 can detect vibration with high sensitivity in a range of 100 kHz to 300 kHz. More specifically, the vibration detection unit 42 has a resonance type AE having a resonance frequency in the range of 100 kHz to 300 kHz. A sensor is preferred. More preferably, it is a resonance type AE sensor having a resonance frequency of 200 kHz.

Here, the vibration detector 42 is fixedly attached so as to contact the strip blade 14A. More specifically, the vibration detector 42 is attached and fixed so that the detection surface of the vibration detector 42 is in contact with one main surface of the strip blade 14A. The attachment and fixing of the vibration detection unit 42 can be performed by various attachment structures such as screw fastening and adhesion. Further, the attachment position of the vibration detection unit 42 may be the strip blade 14A itself or a portion holding the strip blade 14A as long as it does not interfere with the strip operation. Thus, by attaching and fixing the vibration detection unit 42 in a manner in which the vibration detection unit 42 is in contact with the strip blade 14A, the vibration of the AE wave generated by the contact between the core wire Wa and the strip blade 14A can be detected more reliably.

Note that the AE wave generated by the contact between the core wire Wa and the strip blade 14B is also transmitted to the vibration detection unit 42 via the electric wire W, the strip blade 14A, and the like. For this reason, the vibration detector 42 can also detect the vibration of the AE wave caused by the contact between the core wire Wa and the strip blade 14B. But the vibration detection part 42 may be provided in each of a pair of

strip blade

14A, 14B.

The vibration detection signal from the vibration detection unit 42 is input to the contact state determination processing unit 50 as an analog signal having a voltage corresponding to the detected vibration, for example.

FIG. 5 is a block diagram showing a hardware configuration of the contact state determination processing unit 50. The contact state determination processing unit 50 determines whether or not the contact determination criterion for each period is satisfied for each of a plurality of determination periods based on the detection signal input from the vibration detection unit 42, and based on the determination result for each period. Thus, the processing as the contact state determination processing unit 50 that determines the presence or absence of contact between the

strip blades

14A and 14B and the core wire Wa is configured to be executable.

More specifically, the contact state determination processing unit 50 is configured by a general computer in which a CPU 52, a ROM 53, a RAM 54, an external storage device 55, and the like are interconnected via a bus line 51. The ROM 53 stores basic programs and the like, and the RAM 54 is used as a work area when the CPU 52 performs predetermined processing. The external storage device 55 is configured by a nonvolatile storage device such as a flash memory or a hard disk device. The external storage device 55 stores a contact detection program 55a for performing a core wire contact detection process described later. Various functions for detecting contact between the

strip blades

14A and 14B and the core wire Wa are realized by the CPU 52 as the main control unit performing arithmetic processing according to the procedure described in the contact detection program 55a. It is configured as follows. The contact detection program 55a is normally stored and used in advance in a memory such as the external storage device 55, but is recorded in a recording medium such as a CD-ROM or DVD-ROM or an external flash memory. It may be provided as a (program product) or provided by downloading from an external server via a network, and may be additionally or exchanged and stored in a memory such as the external storage device 55. Note that some or all of the functions performed by the contact state determination processing unit 50 may be realized by hardware using a dedicated logic circuit or the like.

Further, the external storage device 55 stores a threshold value 55b as an energy threshold value which is a reference when performing the core contact detection process and a specified value 55c as a contact determination number. The threshold 55b and the specified value 55c will be described later.

In the contact state determination processing unit 50, the detection signal input circuit unit 56, the output circuit unit 57a, the input circuit unit 57b, the input unit 58, and the display unit 59 are also connected to the bus line 51.

The detection signal input circuit unit 56 includes an amplifier circuit, a filter circuit, an AD conversion circuit, and the like. When the vibration detection signal obtained by the vibration detection unit 42 is input as an analog signal, the signal is input to an AD conversion circuit through an amplifier circuit and a filter circuit and converted into a digital signal. As the filter circuit, for example, it is preferable to use a band pass filter having a pass region of 100 kHz to 300 kHz corresponding to an AE wave caused by metal destruction. The vibration detection signal converted into a digital signal by the detection signal input circuit unit 56 is stored in, for example, the RAM 54 or the external storage device 55 as waveform data whose amplitude value changes with time, and is used for contact detection processing described later. Is done.

The output circuit unit 57a is an output circuit that outputs control signals and the like to other devices under the control of the CPU 52. Various signals from the outside, here, operation signals from the strip processing control unit 28, are input to the input circuit unit 57b through the input circuit unit 57b.

The input unit 58 includes various switches, a touch panel, and the like, and is configured to receive various instructions for the contact state determination processing unit 50 in addition to the input setting instruction for the threshold value 55b and the specified value 55c.

The display unit 59 includes a liquid crystal display device, a lamp, and the like, and is configured to be able to display various information such as a contact state determination result under the control of the CPU 52.

FIG. 6 is a functional block diagram of the contact state determination processing unit 50. As shown in the figure, the contact state determination processing unit 50 has functions as a comparison unit 52a and a determination unit 52b. Each of these functions is realized by the CPU 52 performing predetermined arithmetic processing according to the contact detection program 55a as described above.

The comparison unit 52a determines whether or not a contact determination criterion for each period is satisfied with reference to the threshold based on the input vibration detection signal. This determination is performed for each divided period by dividing a period that is a determination range in the input vibration detection signal into a plurality of periods. Then, the comparison unit 52a gives the comparison result to the determination unit 52b.

The determination unit 52b determines whether or not the strip blade and the core wire are in contact with each other based on the determination result for each period by the comparison unit 52a, and outputs the determination result. The determination result is used for stop control of the electric wire strip unit 12, display on the display unit 59, and the like.

FIG. 7 is a flowchart showing contact state determination processing by the contact state determination processing unit 50.

After the contact state determination process is started, the contact state determination processing unit 50 generates waveform data representing vibration detected by the vibration detection unit 42 in a predetermined determination range based on the operation signal from the wire strip unit 12 in step S1. Cut out. Here, the determination range preferably includes at least a part of a period during which the

strip blades

14A and 14B cut into the electric wire W. More preferably, the determination range is such that when the

strip blades

14A and 14B cut into the electric wire W, the

strip blades

14A and 14B cut into the electric wire W, for example, during the period when the

strip blades

14A and 14B may come into contact with the core wire Wa. It is set as a period from the middle of the course until stopping or just before stopping. The determination range may be obtained by cutting out a certain period with reference to the operation start command or the operation stop command of the

strip blades

14A and 14B by the wire strip unit 12. Alternatively, when the speed information or the position information of the

strip blades

14A and 14B is fed back, the cutting may be performed based on the speed information or the position information. In the case where the determination range is cut out based on the speed information, for example, the

strip blades

14A and 14B are moved from the maximum speed in view of the fact that the

strip blades

14A and 14B are gradually lowered after the cut into the electric wire W and stop. It is better to cut out during a period of some deceleration.

In the next step S2, the determination range is divided into a plurality of periods based on the sampled waveform data, and the vibration energy amount represented by the vibration detection signal is calculated for each period. The amount of vibration energy detected by the vibration detector 42 is expressed as an amount corresponding to the amplitude of the amplitude waveform. For this reason, the vibration energy amount may be an average value, an integrated value, an effective value (a so-called approximately calculated effective value), or a true effective value of the amplitude value (absolute value) of the waveform data in each period. Or a representative value in each period. In short, an amount corresponding to the vibration energy detected in each period may be acquired based on the vibration detection signal. The determination range may be divided into at least two. In addition, the determination range is usually divided into a plurality of equal parts, but it is not always necessary to divide the decision range evenly.

In the next step S3, the calculated vibration energy amount value is individually compared with the threshold value 55b, and the number of vibration energy amount values exceeding the threshold value 55b is counted. Here, the threshold 55b is a value that is larger (preferably slightly larger) than the amplitude value observed when the

strip blades

14A and 14B cut into the coating Wb, and is determined experimentally and empirically. Stored in the unit 55 in advance. When the value of the vibration energy amount is the same as the threshold 55b, it may be added to the count number or may not be added. Then, when the comparison for all the periods is completed, the process proceeds to the next step S4.

In step S4, it is determined whether or not the count number exceeds a specified value. Here, the specified value 55c indicates how much the ratio of the period during which the value of the vibration energy amount exceeds the threshold 55b in the determination range determines that the

strip blades

14A and 14B are in contact with the core wire Wa. Reference values are shown. The specified value 55c is determined experimentally and empirically according to the length of the period obtained by dividing the determination range, the threshold 55b, and the like, and is stored in the storage unit 55 in advance.

When it is determined that the count number exceeds the specified value, it is determined that there is a contact, and the determination result is output. Based on the determination result, the display unit 59 displays that there is contact. Alternatively, based on the determination result, a signal for stopping the strip processing is given to the electric wire strip unit 12. Thereby, on the electric wire strip unit 12 side, it is good to receive the said signal and to stop strip processing temporarily.

On the other hand, if it is determined that the count does not exceed the specified value, it is determined that there is no contact. Thereby, strip work etc. are performed continuously.

When the count number is the same as the specified value, it may be determined that there is contact or may be determined that there is contact.

According to the core wire contact detection device, the core wire contact detection method, and the core wire contact detection program configured as described above, when the

strip blades

14A and 14B come into contact with the core wire Wa, vibration at that time is detected through the vibration detection unit 42. . And based on the vibration detection signal input from the vibration detection part 42, the presence or absence of contact with

strip blade

14A, 14B and the core wire Wa can be determined. Thereby, when stripping the coating Wb of the electric wire W, the contact between the core wire Wa and the

strip blades

14A and 14B can be easily detected without electrically connecting an inspection electrode to the core wire.

Also, for the following reasons, the contact between the strip blade and the core wire can be more accurately determined while suppressing the influence of noise.

First, the vibration detection signal from the vibration detection unit 42 includes not only vibration due to contact between the strip blade and the core wire but also various other external noises. In general, the other various external noises are larger than the magnitude of vibration caused by contact between the strip blade and the core wire. In addition, when the source of external noise is due to collision or rubbing of metals generated from other parts of the machine, the vibration frequency due to contact between the strip blade and the core wire is similar to the frequency of external noise. . For this reason, it becomes difficult to separate a signal necessary for determination and external noise. Then, when the detected amplitude of vibration exceeds a predetermined value, the method of determining that the

strip blades

14A and 14B are in contact with the core wire Wa cannot eliminate the influence of the external noise and is accurate. It becomes difficult to make a determination.

Incidentally, the vibration caused by the contact between the strip blade and the core wire is continuously generated to some extent during the contact period between the strip blade and the core wire. In contrast, various external noises are generated only during the collision or rubbing period between metals in other parts of the machine, and in a relatively short time compared to the period of vibration generation due to contact between the strip blade and the core wire. It is common.

Therefore, as in this embodiment, based on the vibration detection signal, the vibration energy amount is calculated for each of a plurality of periods, the number of vibration energy amount values exceeding the threshold 55b is counted, and the count number exceeds the specified value. If it is determined that there is contact, even if there is a large external noise, if the generation time is sufficiently short, the influence of the external noise is suppressed, and the

strip blades

14A and 14B and the core wire The contact with Wa can be determined more accurately.

Further, by comparing the value of the vibration energy amount in each period with the threshold 55b, it is possible to determine whether or not the contact criterion for each period is satisfied by a relatively simple process.

Further, when the count value of the vibration energy amount in each period exceeds the threshold value 55b exceeds the specified value 55c, it is determined that there is contact between the

strip blades

14A and 14B and the core wire Wa, thereby determining whether or not there is contact. This can be done relatively easily.

Further, when the operating range includes a period in which the

strip blades

14A and 14B are cut into the electric wire W, it is possible to more accurately determine whether or not the strip blade and the core wire are in contact with each other during that period.

Here, another setting example of the determination range will be described. FIG. 8 shows an amplitude waveform in a period from when the

strip blades

14A and 14B start the strip processing to reach the maximum speed until immediately before the

strip blades

14A and 14B are sufficiently slowed down and cut into the coating Wb. 4 shows an example of change with time of the moving speed of the

strip blades

14A and 14B. In FIG. 8, at the time indicated by the arrow A1, the

strip blades

14A and 14B are in a state immediately before cutting into the coating Wb as shown in FIG. 9, and at the time indicated by the arrow A2, as shown in FIG. The

blades

14A and 14B are in a state of being cut into the covering Wb, and the

strip blades

14A and 14B are sufficiently cut into the covering Wb as shown in FIG. 11 at the time indicated by the arrow A3.

In the above embodiment, the example in which the determination range is set as the period T1 until the

strip blades

14A and 14B are cut into the electric wire W until it stops or just before it stops is described.

The determination range is not limited to such a case, and may be set to various periods during which vibration can occur due to contact between the

strip blades

14A and 14B and the electric wire W.

For example, the determination range may be set to a period T2 including a period Ta after the

strip blades

14A and 14B are cut into the electric wire W and stopped.

That is, even when the

strip blades

14A and 14B are cut into the electric wire W and stopped, it is confirmed that vibration due to contact between the

strip blades

14A and 14B and the core wire Wa is detected for a short period of time.

Therefore, the presence or absence of contact can be determined as described above by the determination period T2 including the period Ta after the

strip blades

14A and 14B are cut into the electric wire W and stopped. Moreover, since the operation of the drive mechanism portion of the

strip blades

14A and 14B is stopped during the period Ta after being cut into the electric wire W and stopped, the generation of external noise is suppressed. Therefore, the presence or absence of contact between the

strip blades

14A and 14B and the core wire Wa can be more accurately determined by including the period Ta as the determination period.

Further, for example, the determination range may be set to a period T3 including a period Ta when the

strip blades

14A and 14B cut into the electric wire W move relative to the end portion side of the electric wire W to remove the covering Wb. Good.

That is, even when the

strip blades

14A and 14B cut into the electric wire W are relatively moved toward the end of the electric wire W to remove the coating Wb, vibration due to contact between the

strip blades

14A and 14B and the core wire Wa is detected. It was confirmed that Therefore, the presence or absence of contact can be determined as described above also by the period T3 including the period Tb for removing the covering Wb.

Note that the determination range may be a period including only the period Ta after the

strip blades

14A and 14B are cut into the electric wire W and stopped, or a period including only the period Tb for removing the coating Wb. That is, any period may be set as long as vibration can occur due to contact between the

strip blades

14A and 14B and the electric wire W.

Also, the determination range may be divided into a plurality of values, and the threshold value may be set to a different value for each category. For example, the threshold value of the period Ta after the

strip blades

14A and 14B are cut into the electric wire W and stopped is set to a smaller value than the threshold value during the period in which the

strip blades

14A and 14B are cut into the electric wire W. It may be.

Here, based on actual experimental results, the relationship between the vibration amplitude waveform that appears during strip processing and the vibration energy amount distribution calculated for each period will be described.

FIG. 12 shows the time (s) and amplitude (V) in the determination range when the strip can be normally performed, that is, when only the coating Wb can be successfully removed without causing damage or cutting to the core wire Wa. (Amplitude waveform). In this case, a portion where the amplitude is exceptionally large is observed at the beginning of the determination range, but a relatively small amplitude waveform is shown as a whole.

FIG. 13 is a diagram in which the determination range is divided into 20 to calculate the vibration energy amount for each period, and the distribution of the calculated vibration energy amount is shown in time order. As shown in the figure, when the strip can be performed normally, the distribution of vibration energy amount is approximately 0.1 (V) or less except that the distribution of vibration energy exceeds 0.1 (V) in two periods. Low value.

FIG. 14 shows an amplitude waveform when stripping can be performed normally and external noise is mixed. In this case, in the middle of the determination range, a part where the amplitude is extremely increased due to the external noise is observed, and a relatively small amplitude waveform is shown in the other part.

FIG. 15 is a diagram showing the vibration energy amount distribution of FIG. 14 in time order. As shown in the figure, a portion where the vibration energy amount is relatively large due to external noise is observed in the middle of the determination range. Other portions are the same as those shown in FIG.

FIG. 16 shows the amplitude waveform when the core wire Wa is damaged during the strip processing. In this case, a relatively large amplitude is observed in the entire determination range.

FIG. 17 is a diagram showing the vibration energy amount distribution of FIG. 16 in time order. As shown in the figure, the vibration energy amount is relatively large in the entire determination range.

As shown in these figures, when the strip can be performed normally, the vibration energy amount in a plurality of periods is relatively small, and even if there is an influence of external noise, the vibration energy amount in a relatively small number of periods. Is confirmed to be only large.

On the other hand, when the

strip blades

14A and 14B are in contact with the core wire Wa, it can be seen that the vibration energy amount due to vibration increases in a longer period.

For this reason, by setting the threshold value 55b, the specified value 55c and the like to appropriate values so as to eliminate the change in the vibration energy amount due to the influence of the external noise, the influence of the external noise is eliminated and the strip blade 14A, It was confirmed that the presence or absence of contact between 14B and the core wire Wa can be determined more accurately.

Note that the threshold values and specified values as described above are actually experimental and experienced, such as the material and shape of the core wire Wa and the covering Wb, the material and shape of the

strip blades

14A and 14B, and the operating conditions of the

strip blades

14A and 14B. Is set.

In the above embodiment, whether or not the vibration energy amount exceeds the threshold value for each period is determined to satisfy the contact criterion for each period, but this is not necessarily required. For example, whether or not the contact criterion for each period is satisfied may be set based on the waveform for each period (for example, the degree of change in amplitude, waveform comparison with a certain reference waveform) or the like.

In short, the determination range may be divided into a plurality, and it may be determined whether or not any determination criterion is satisfied for each divided period.

Even in such a case, it can be determined that the strip blade is in contact with the core wire when the number satisfying the determination criterion exceeds a preset contact determination number.

DESCRIPTION OF SYMBOLS 10 Electric wire strip processing apparatus 12 Electric

wire strip unit

14A, 14B Strip blade 16 Blade drive part 40 Core wire contact detection apparatus 42 Vibration detection part 50 Contact state determination processing part 52 CPU
52a Comparison unit 52b Judgment unit 55 External storage device 55a Contact detection program 55b Threshold value 55c Specified value W Electric wire Wa Core wire Wb Coating

Claims

A core wire contact detection device for detecting contact between a strip blade and a core wire when stripping the coating of the electric wire with a strip blade,
A vibration detection unit capable of detecting vibration in a frequency range including a vibration frequency generated by contact between the core wire of the electric wire and the strip blade;
Based on the vibration detection signal input from the vibration detection unit, it is determined whether or not the contact criterion for each period is satisfied for each of a plurality of determination periods, and the contact between the strip blade and the core wire is determined based on the determination result for each period. A contact state determination processing unit for determining presence or absence;
A core wire contact detection device.
The core wire contact detection device according to claim 1,
The said contact state determination process part is a core contact detection apparatus which determines with satisfy | filling the contact criterion for every period, when the vibration energy amount for every period which the said vibration detection signal represents exceeds the preset energy threshold value.
The core wire contact detection device according to claim 1 or 2,
The contact state determination processing unit
A core wire contact detection device that determines that there is a contact between the strip blade and the core wire when the number satisfying the contact determination criterion for each period exceeds a preset contact determination number.
A core wire contact detection device according to any one of claims 1 to 3,
The plurality of determination periods include a core wire contact detection device including a period during which the strip blade cuts into the electric wire.
The core wire contact detection device according to any one of claims 1 to 4,
The plurality of determination periods include a period after the strip blade has been cut into the electric wire and stopped.
A core wire contact detection device according to any one of claims 1 to 5,
The plurality of determination periods include a period when the strip blade cut into the electric wire moves relative to the end side of the electric wire to remove the coating, and the core wire contact detection device.
The core wire contact detection device according to any one of claims 1 to 6,
The core wire contact detection device, wherein the vibration detection unit is a resonance type AE sensor having a resonance frequency in a range of 100 kHz to 300 kHz.
The core wire contact detection device according to any one of claims 1 to 7,
A pair of strip blades that can be cut into the sheath of the wire;
A blade drive unit that moves the pair of strip blades closer and away from each other;
A core wire contact detection device further comprising:
The core wire contact detection device according to claim 8,
A core wire contact detection device, wherein the vibration detection unit is provided so as to contact at least one of the pair of strip blades.
A core wire contact detection method for detecting contact between a strip blade and a core wire when stripping the coating of the electric wire with a strip blade,
(A) performing a strip process including a process of cutting a strip blade into an electric wire;
(B) in the step (a), detecting vibration in a frequency range including a vibration frequency generated by contact between the core wire of the electric wire and the strip blade;
(C) Based on the detected vibration, it is determined whether or not the contact criterion for each period is satisfied for each of a plurality of determination periods, and the presence or absence of contact between the strip blade and the core wire is determined based on the determination result for each period. Steps,
A core wire contact detection method comprising:
When stripping the sheath of the wire with the strip blade, vibration in the frequency range including the vibration frequency generated by the contact between the core wire of the wire and the strip blade is detected, and the contact between the strip blade and the core wire is detected based on the vibration detection signal. A core contact detection program for determining the presence or absence of a computer,
(A) Based on the vibration detection signal, determining whether or not a contact criterion for each period is satisfied for each of a plurality of determination periods;
(B) determining the presence or absence of contact between the strip blade and the core wire based on the determination result for each period in the step (A);
Core wire contact detection program for realizing