JPH10167571A - Wire drum support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily measure a wire length while securing a function as a wire feeding device, and to reduce an influence of an error in measuring a wire length due to a winding amount of a wire. . SOLUTION: A support rod 1 which is arranged above a pair of support side plates 11 and is installed in a state of being bridged and rotatably supports an electric wire drum A.
2 and a connecting member 13 disposed over a lower portion of the pair of support side plates 11 are formed of a ferromagnetic material, and a magnetic path forming portion 14 having magnetism is disposed on the support side plate 11 and formed by these. When the exciting coil 3 is interposed in the magnetic path and an exciting current flows through the exciting coil 3, the induced voltage of the electric wire W is measured, and the number of turns of the electric wire W is calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire drum supporting device, and more particularly to a device for measuring a length of an electric wire wound around a drum.

[0002]

2. Description of the Related Art When an electric wire wound around a drum is sent out to extend an electric wire, it is necessary to check how much electric wire remains on the electric wire drum. It is convenient if the winding amount of the electric wire can be easily checked even when the wire is wound.

[0003] In the case of a power cable or a coaxial cable, since a shielding layer having magnetic conductivity is provided around a conductor, the length of the electric wire can be measured using, for example, a pulse radar method. It is.

[0004]

However, in the case of an electric wire having only one conductor, the pulse radar method cannot be applied, and the labor of unwinding the wound electric wire and performing actual measurement is required. In addition to the increase in the number of wires, there is a possibility that a problem that the length of the wires becomes insufficient at the time of laying the wires.

[0005] The present invention has been made in view of the above-mentioned circumstances, and achieves the following objects. 1) To be able to easily measure the length of an electric wire wound around a drum. 2) To reduce the influence of errors when measuring the wire length. 3) To secure the function as a device for sending out electric wires from the drum.

[0006]

SUMMARY OF THE INVENTION A pair of support side plates arranged at an interval and an upper portion of the support side plate is installed in a state of being bridged and inserted into a shaft hole of an electric wire drum to rotatably support the electric wire drum. A drum support device having a support rod;
A connecting member is disposed over a lower portion of the pair of supporting side plates, the supporting rod and the connecting member are formed of a ferromagnetic material, and a magnetic path forming portion having magnetism is disposed on the supporting side plate, and the connecting rod is connected to these supporting rods. A magnetic path is formed by the member and the magnetic path forming portion, and an exciting coil is disposed in the magnetic path in an interposed state. An AC power supply for supplying an exciting current is connected to the exciting coil, and a detection control unit having a function of controlling the exciting current to the exciting coil and a function of displaying the number of turns and the length of the wires is provided on the support side plate. You. The magnetic flux generated when an exciting current flows through the exciting coil is guided by a magnetic path including a support rod, a connecting member, and a magnetic path forming portion, and generates an induced voltage proportional to the number of turns in an electric wire around the support rod. Therefore, the number of turns of the electric wire is calculated from the relationship between the excitation voltage, the induced voltage, and the number of turns of the exciting coil, and the length of the electric wire is obtained from the number of turns of the electric wire and the diameter of the electric wire. When the supporting side plate is made of a non-magnetic material, the magnetic path forming portion is made of a ferromagnetic material, and the magnetic path forming portion magnetically connects the ends of the support rod and the connecting member. Is set.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an electric wire drum supporting device according to the present invention will be described below with reference to FIGS. 1 and 2, reference symbol A denotes an electric wire drum, W denotes an electric wire, 1 denotes a support stand, 2 denotes an AC power supply, 3 denotes an exciting coil, 4 denotes a detection control means, 5 denotes a connector, and 6 denotes a lead wire. I have.

The support stand 1 includes a pair of support side plates 11 arranged on the left and right at an interval, and the support stand 1 is disposed above the support side plate 11 in a state of being erected and inserted into a shaft hole of the electric wire drum A so as to hold the electric wire drum A. A supporting rod (mandrel) 12 rotatably supported, a connecting member 13 disposed over a lower portion of the pair of supporting side plates 11, and an end of the supporting rod 12 and the connecting member 13 disposed on the supporting side plate 11 are magnetically connected. And a magnetic path forming portion 14 in a connected state.
2. The connection member 13 and the magnetic path forming portion 14 are formed of a ferromagnetic material such as silicon steel. The support rod 12 is attached to the support side plate 11 so as to be able to be inserted and removed, and to the upper part of the magnetic path forming portion 14 so as to be magnetically connectable and splittable. When the support side plate 11 is made of a non-magnetic material, the magnetic path forming portion 14 is arranged separately from the support side plate 11, but when the support side plate 11 is made of a ferromagnetic material such as a steel plate. Is the supporting side plate 11
Is used as the magnetic path forming unit 14.

The exciting coil 3 is disposed in the middle of a magnetic path formed in a closed circuit by the support rod 12, the connecting member 13 and the magnetic path forming part 14, and is provided with a magnetic flux by power supply from the AC power supply 2. In the example shown in FIG. 1, it is attached in a wound state around the magnetic path forming portion 14 outside the support side plate 11.

The detection control means 4 is connected to both ends of the electric wire W wound around the electric wire drum A via a connecting tool 5 such as a crocodile clip and a lead wire 6, and has a function of measuring an induced voltage. In addition, a device having a function of measuring the exciting voltage of the exciting coil 3 and a function of adjusting the magnitude of the exciting current of the exciting coil 3 are employed.

Hereinafter, the measurement of the length of the electric wire W wound around the electric wire drum A will be described. As shown in FIG. 1, an electric wire drum A wound with an electric wire W is attached to a support stand 1, and an exciting coil 3
When the magnetic flux is generated by supplying power to the support rod 12, the generated magnetic flux is guided by a magnetic path including the support rod 12, the connecting member 13, and the magnetic path forming portion 14, and is proportional to the number of turns of the electric wire W around the support rod 12. An induced voltage Vs is generated.

At this time, the excitation coil 3 and the support rod 1
2, the connecting member 13, the magnetic path forming portion 14, and the electric wire W form a primary coil, a magnetic path, and a secondary coil of the transformer as shown in FIG. Equation 1]
, The number of turns Ts of the electric wire W can be obtained. Ts = Tp × (Vs / Vp) (1) where Tp is the number of turns of the exciting coil, Vp is the exciting voltage of the exciting coil, Ts is the number of turns of the electric wire W, and Vs is the induced voltage of the electric wire W. . Therefore, if the detection control unit 4 measures the excitation voltage: Vp and the induced voltage: Vs of the electric wire W, the number of turns Ts of the electric wire W can be calculated based on [Equation 1].

If the number of turns is known, the length (strip length) of the electric wire W can be easily obtained from the product of the number of turns and the average diameter.

In the detection control means 4, since the number of turns of the exciting coil 3 is set in advance, the number of turns of the electric wire W can be directly read. In this case, a scale for multiplying the exciting voltage of the exciting coil: Vp by the ratio of Tp / Vp is prepared in advance in the detection control means 4, and the exciting voltage of the exciting coil 3 is set to a predetermined value (constant). Value) and the number of turns may be displayed.

[0015]

According to the wire drum supporting device of the present invention, a magnetic path passing through the center of the wound wire is formed in the portion of the support stand that supports the wire drum, and the exciting current is supplied to the exciting coil. Since the induced voltage of the electric wire is measured when flowing, the number of turns of the electric wire is calculated based on the number of turns of the exciting coil and the exciting voltage. Therefore, the following effects are obtained. (1) The length of the wound wire can be quickly and easily detected by measuring the induced voltage. (2) Since the induced voltage is obtained in proportion to the number of turns of the electric wire, it is possible to reduce the occurrence of errors in measuring the electric wire length. (3) The wire drum is rotatably supported by the support stand, so that the wire can be fed or wound without any trouble, and the winding amount can be measured as necessary. (4) As described above, the electric wire drum can be reliably and easily managed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an electric wire drum supporting device according to the present invention.

FIG. 2 is a connection diagram showing a principle of detecting an induced voltage of the electric wire shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS A Electric wire drum W Electric wire 1 Support stand 2 AC power supply 3 Exciting coil 4 Detection control means 5 Connector 6 Lead wire 11 Support side plate 12 Support rod (mandrel) 13 Connecting member 14 Magnetic path forming part

Claims (3)

[Claims] 1. A pair of supporting side plates (11) arranged at an interval, and a pair of supporting side plates (11) arranged in an upper part of the supporting side plate and inserted into a shaft hole of an electric wire drum (A) so that the electric wire drum can be rotated. A drum supporting device having a supporting rod (12) for supporting, wherein a connecting member (13) is arranged below lower portions of the pair of supporting side plates, and the supporting rod and the connecting member are formed of a ferromagnetic material, A magnetic path forming portion (14) having magnetism is disposed on the supporting side plate, and a magnetic path is formed by the support rod, the connecting member, and the magnetic path forming portion, and an exciting coil (3) is interposed in the magnetic path. An electric wire drum supporting device arranged in a state. 2. A detection control means (4) having a function of indicating the number of turns or the length of an electric wire (W) on a supporting side plate (11).
The electric wire drum supporting device according to claim 1, wherein a wire drum is provided. 3. The supporting side plate (11) is made of a non-magnetic material, the magnetic path forming part (14) is made of a ferromagnetic material, and the magnetic path forming part is formed of a support rod (12) and a connecting member ( The electric wire drum supporting device according to claim 1 or 2, wherein the end of (13) is magnetically connected.