JPS58186061A - Portable disconnection testing machine - Google Patents

Abstract

PURPOSE:To obtain a portable disconnection testing machine which can be used in a job site for laying a cable, by forming a core wire extracting part for automatically extracting a core wire of the cable and connecting it to a necessary electrode, by an electric disk, as one body with the testing machine. CONSTITUTION:An electric disk 13 provided as one body on a housing 1 is turned by connecting one core wire of a cable to an earth terminal 33 provided on the testing machine housing 1. As a result, the core wire is extracted successively to a groove 13a of the disk 13, and the core wire whose extraction is detected by an edge-like electrode is connected to a fixed electrode 25 through a spring electrode 23. Subsequently, the core wire is brought to a disconnection test successively. By this small-sized constitution formed as one body, by which the core wire is extracted and connected automatically, it is possible to obtain a portable disconnection testing machine which can be used in a job site for laying a cable in a narrow space, too.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a portable disconnection tester, and particularly to a portable disconnection tester for testing each of multi-core cables, such as communication cables, which have a large number of core wires (each including a conductor and a sheath for insulating it). This invention relates to a portable wire breakage tester that automatically separates core wires one by one and tests the wires for wire breakage.

The applicant previously proposed a very effective disconnection tester that can automatically detect disconnections in each core of a multi-core cable.

Such a conventional disconnection tester is disclosed in, for example, Japanese Patent Application Laid-Open No. 53-53789 published on May 16, 1978.
Disclosed in the issue.

Conventional disconnection testers are basically H-type, which consists of three independent parts: a core extraction part, an operation part, and a control part. It was intended to be used in factories that shipped products.

However, in recent years, there has been a new demand for conducting disconnection tests on cables after laying IQ at cable laying construction sites. Conventional disconnection testing machines are not intended for use at such construction sites, and therefore it is extremely difficult to transport them as they are to construction sites such as inside manhole tunnels. In the disconnection testing machine, there were 8 machines that installed the test M machine on the near end side of the group, connected the core wire group at the far end all at once, and then electrically connected it to the disconnection test rA tsuki. As it was, it was unsuitable for use at cable-laying construction sites.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a portable wire breakage tester that can be effectively used at cable installation sites and has an inspection III function equivalent to that of conventional wire breakage testers.

A portable disconnection tester according to the present invention includes a housing;
A fiber extraction mechanism including a motor provided inside the housing, a moving member provided outside the housing and to which a driving force is applied by the motor, an electrode provided in association with the fiber extraction mechanism, and a proximal end. It includes a ground terminal for connecting one wire of the side core wire group thereto, and an electric circuit connected to each electrode inside the housing to perform core wire extraction and disconnection detection.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention. A portable wire breakage tester has a portable size, for example, 130x.
It includes a housing 1 having a size of 140x185mm). This housing 1 can be hung from, for example, the operator's neck by means of a strap 3 attached at an appropriate location. A core wire extraction/detection unit 5 is provided outside one side of the housing 1 . Moreover, the motor 7, the speed reducer 119, and related electric circuits are housed inside the housing 1. The core wire extraction/detection unit 5 includes a cover 11, and a disk 13 is provided covered by the cover 11. The disk 13 is for sequentially separating and extracting each core wire one by one from the near-end side core wire group of the multi-core cable, and its rotation center is inserted into and fixed to the rotating shaft 98 of the reducer 819. A portion of the cover 11 is cut out.

That is, the cover 11 includes a fiber group input part 15 for collectively holding the proximal fiber group and bringing it to the circumferential surface of the disk 13, and a fiber group input part 15 for collectively holding the fiber group on the proximal end side and bringing the fibers extracted by the disk 13 and then tested. A core wire discharge section 17 for discharge is formed. The disk 13 may be formed as shown in Japanese Patent Laid-Open No. 53-53789, and a plurality of core wire extraction grooves 138, 15-3a, . . . are formed on the circumferential side thereof.

A core wire holding block 19 and an insulating block 21, which are lids, are provided outside the disk 13, with their inner peripheral surfaces close to the disk and with a very small gap therebetween. The lid body, ie, the two blocks 19 and 20, prevent the core wire caught in the core wire extraction groove 13a from falling out from the groove. These blocks 19 and 21 cover 1
It is fixed to the edge of 1. The insulating block 21 is provided with a spring electrode 23 for detecting whether a core wire is taken into the core wire extraction groove '13a. The spring electrode 23 is fixed at one end between the insulating blocks 21 and is swingable at the other end. This splash electrode 23 is normally located inward from the circumferential side of the disk 13, and is pushed outward by the core wire taken into the core wire extraction groove 13a during core wire extraction. A fixed electrode 25 is provided on the insulating block 21 at a position where it can come into contact with the spring electrode 23 pushed outward in this manner. A bolt is provided at the rear end of the fixed electrode 25 so that the contactable position can be adjusted depending on the diameter of the core wire.

Along the circumferential side path of the disk 13, in front of the spring electrode 23 when viewed from the rotational direction of the disk, a blade-shaped electrode 27 whose tip is directed inward is fixed to the insulating block 21. This blade-shaped electrode 27 is used to apply a voltage to the conductor by breaking the coating of the core wire extracted by the disk 13, and is provided with a blade-shaped portion at the tip slightly protruding inward from the outer periphery of the disk 13. It will be done. This blade-shaped electrode 27
A bolt is provided at the rear end to change the protruding state depending on the diameter of the core wire. Since test voltages are applied to the fixed electrode 25 and the blade-like electrode 27 as described later, an insulating cover 29 is provided to cover their live parts.

A block 31 is further provided on the cover 11, and a tip 31a of the block 31 is formed as a separator. That is, the separator 31a is formed, for example, in the shape of a comb, and is used to take out the core wire that has been moved while being restrained by the groove 138 of the disk 13, and the core wire taken out by this separator 31a is used for wire discharge. It is discharged at section 17. In this way, the core wire extraction/detection unit 5 is subjected to 1IIR.

A ground terminal 33 is provided outside the housing 1 near this unit 5. This ground terminal 33 is for connecting one wire of the near-end side core wire group thereto. This ground terminal 33 must be used to conduct the core wire group on the far end side, and then electrically connect it to the testing machine provided on the near end side using another connecting wire.
This inconvenience can be resolved.

A power switch 35 and a pylon 1 to a lamp 37 are attached to the other side of the housing 1.

The counter 39 is for counting the number of broken wires and/or the number of detected wires, and is reset by pressing the reset switch 41.

Another reset switch 43 resets the test circuit, including the control circuit (described later), to the initial state after detecting the disconnection.
, t, to make it ready for testing again. Switches 45 and 47 are for turning motor 7 off and on, respectively.

The disconnection indicator 49 is made of, for example, a light emitting diode,
Lights up when a broken core wire is detected.

FIG. 2 shows a preferred embodiment of the electrical circuit of the FIG. 1 embodiment. The multi-core cable 10 includes a large number of insulated core wires, and each of the core wires of the distal end core wire group 10a is conducted into the handle by the collective conduction means 10b, that is, all the distal end core wires are connected to each other. The conductors of the group are interconnected. The portable breakage tester is brought near the near-end core group 10C of the multi-core cable 10. That is, the operator of this wire breakage tester can perform a wire breakage test on each core wire by introducing the near-end side core wire group 10c into the aforementioned wire inserting section 15 (FIG. 1). The circuit configuration shown in FIG. 2 is provided within the housing 1.

Terminals 101 and 103 are connected to a test power supply. For example, 5 volts DC may be used as the test power source. Two resistor series circuits are connected in parallel between terminals 101 and 103, and terminal -9=101 is further commonly connected to fixed electrode 25 and blade-like electrode 27 through resistor 105. One resistor series circuit includes resistors 107 and 109, and the other resistor series circuit includes resistors 111 and 113. Resistor 107 and 1
The series connection point with 09 connects comparator 1 to provide a reference voltage.
The series connection point of resistors 111 and 113 is connected to one input of comparator 119 to provide another reference voltage. The other input of the comparator 117 is connected to the blade electrode 27 and the fixed I&pole 25. The comparator 117 is for determining whether there is a conduction state, that is, a disconnection, and the comparator 11119 is for determining whether the core wire has been reliably extracted in the core wire extraction/detection unit 5 (FIG. 1). It is something to do. Note that the spring electrode 23 is grounded via a resistor 115. The other input of the comparator 119 is connected to the connection point between the spring electrode 23 and the resistor 115. The control circuit 125 has a terminal 12
1 and 123 provide power for the control circuit.

The control circuit 125 performs core wire extraction and wire breakage determination based on signals provided from the comparators 117 and 110-119. Control circuit 125 is further provided with signals from switches 41, 43, 45 and 47, from which signals are provided to disconnection indicator 49 and counter 39. Control circuit 125 controls motor control circuit 131 to deenergize or energize motor 7 based on signals from switches 45 and 47.

A motor IIm is applied to the motor control circuit 131 from terminals 127 and 129.

In operation, the operator connects the wire 10d included in the proximal end group 11I group 10C of the multi-core cable 10 to the housing 1.
Connect to the ground terminal 33 provided above! do. This earth terminal 33 is naturally grounded. The test power supply voltage is divided by resistors 107 and 109 and the comparator 11
7 as a reference voltage, the test power supply voltage is divided by resistors 111 and 113, and the comparator 119
is applied as a reference voltage to one input of the

As the disk 13 rotates, the core wire 10fl restrained by the disk 13a is brought to the position of the spring electrode 23. Then, this spring electrode 23 is pushed outward, and the spring electrode 23 comes into contact with the fixed electrode 25. As a result, resistance 105
A current flows in the path of → fixed electrode 25 → spring electrode 23 → resistor 115 → ground, and a voltage obtained by dividing the test power supply voltage by resistors 105 and 115 is applied to one input of comparator 119. Resistors 105°, 115 .
Since the values 111 and 113 are chosen, comparator 1
The output of 19 is inverted from its previous state. This inversion of the output of comparator 119 is detected by control circuit 125, and I control circuit 125 increments counter 39 as necessary.

According to the rotation of the disc] 3, the core wire 108G restrained by the groove 138 is then brought to the position of the blade-shaped electrode 27. When the conductor of the extracted core 1i108 contacts the blade-like electrode 27, a current flows through the path of the far end core wire group 10a of the multi-core cable 10→one core 411110cl→the ground terminal 33. That Ii! iJi! , the potential applied to the other input of the comparator 117 is applied to the resistor 105 and the core wire 10.
The voltage drops to the potential divided by the conductor resistances 6 and 10d. That is, when the blade electrode 27 does not contact the core conductor, the other input of the comparator 117 is connected to the resistor 105.
The power supply voltage is stepped down by .

This voltage is chosen to be higher than the reference voltage provided by resistors 107 and 109. However, when the blade electrode 23 contacts the core Iil conductor of the core wire 10e, this comparator 117
The other input voltage becomes a value sufficiently lower than the reference voltage, and as a result, the output of the comparator 117 is inverted. This comparator 11
7 is detected by the control circuit 125.

That is, in the control circuit 125, the comparator 11
When the core conductor signal is input from 7, it is determined that the extracted core is normal. If the output of the comparator 117 does not invert within a certain period of time from the inversion of the output of the comparator 119, then the control circuit 125 detects that the extracted core wire is in a disconnection state and detects the disconnection. The display 49 is turned on and a stop signal is sent to the motor control circuit 131. Accordingly, braking is applied to the motor 7, and the motor 7 stops instantaneously.

Thereafter, when the reset switch 43 is pressed to restart the test, the disconnection indicator 49 is turned off and the control circuit 125 and the like are returned to their initial states. When switch 41 is pressed, I
The IIJIIp circuit 125 resets the counter 39,
It is returned to its initial state.

Note that as the motor 7, a normal induction motor can be used when the power supplied to the terminals 127 and 129 is AC.

Since it is portable, it is more preferable to use a direct current power source, but if the terminals 127 and 129 are supplied with, for example, 12 volts direct current from a car battery, a stepping motor can be used as the motor 7. . When using a stepping motor, there is no need to use a speed reducer, so there is no backlash that tends to occur in speed reducers, and there are no problems with stopping when a disconnection is detected and restarting after that. -14 including conventional disconnection tester
= If an induction motor is used, the inertia of the motor will cause a significant overrun when detecting a wire breakage, and problems such as a backlash of the reducer and a delay in the start-up time will cause problems such as a lag in the timing of wire breakage detection. There are cases.

On the other hand, if a stepping motor is used, overruns can be avoided and malfunctions due to time lags will not occur. In addition, since the stepping motor has a good response when starting and stopping, it is possible to provide more extraction grooves on the outer circumference of the disk, thereby increasing the testing speed without increasing the rotational speed of the motor, that is, the circumferential speed of the disk 13. I can do it.

Further, in the above-described embodiment, the explanation was given that the camera is used by being hung from the operator's neck using the strap 3, but it may also be possible to use it by attaching it to a commercially available camera tripod.

As described above, according to the present invention, it is possible to obtain a breakage tester that is portable and has test performance equivalent to that of the conventional one, so it can be used especially in tunnels and other multi-core cable installation sites. It is very useful because it can also be used to inspect each core wire for breaks.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an embodiment of the present invention. FIG. 2 is a preferred electrical circuit diagram of the embodiment of FIG. In the figure, 1 is a housing, 3 is a strap, 5 is an extraction/detection unit, 7 is a motor, 13 is a disk, 23
25 is a fixed electrode, 27 is a blade electrode, and 33 is a ground terminal. The rest

Claims (1)

[Scope of Claims] A portable disconnection tester for testing disconnection of each core wire of a multi-core cable in which the far end sides of a plurality of insulated core wires are collectively conducted, comprising: a portable housing; an interior of the housing; a motor housed in the housing, a movable member provided on the outside of the housing and having one or more grooves on its surface that are driven by the motor and capable of accommodating core wires one by one, and movement of the movable member. It consists of a lid body provided along and close to the route,
a core wire extracting means for sequentially extracting core wires one by one from m groups of adjacent cores of a multi-core cable into the groove; an extraction detection electrode for detecting whether or not the proximal-end core wire has been extracted; a measurement electrode that is provided along the moving path of the moving member and can come into contact with the conductor of the extracted proximal-end core wire; a ground terminal provided on the outside of the housing for connecting one wire of the proximal end core group of the multi-core cable thereto; a ground terminal provided inside the housing and coupled to the extraction detection electrode on the proximal end a first electric circuit means for determining whether or not a core wire has been extracted; and a first electric circuit means provided inside the housing, and configured to detect when a conductor of the extracted proximal core wire comes into contact with the measurement electrode. A portable disconnection test* comprising a second electrical circuit means for detecting a continuity state between the terminal and the ground terminal.