JPH0554041B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a contact wire wear amount measuring device that continuously measures and records the wear amount of a contact wire over the entire line.

[Background of the Invention] Contact wires such as contact wires are gradually worn out due to the constant sliding of current collection shoes, and the amount of wear reaches the permissible wear amount of the contact wire (for example, 40% of the outside diameter of the contact wire). When this happens, you will need to replace it.

However, if this wear occurs uniformly over the entire contact wire, it may be possible to manually measure it at several points using a micrometer, etc., but on an actual line, Because the current collector shoe does not always slide uniformly on the contact wire, it may wear abnormally in places, and if this abnormality develops beyond a certain limit, there is a risk that it will eventually lead to a disconnection accident. .

For this reason, it is necessary to periodically check the entire contact wire. However, it is not easy to conduct manual inspections over long distances, and moreover, these inspections need to be carried out late at night when train operations are suspended, which is costly in terms of human resources, labor, and time. In addition to being extremely difficult, it was extremely difficult to thoroughly inspect the entire line.

Therefore, a measuring device (see Japanese Patent Publication No. 43-24125) connects a measuring roller or a pick-up to an operating transformer, moves it in contact with the contact sliding surface of the contact wire, and electrically detects the amount of change. )
However, this type has a structure in which the measuring roller or pick-up directly contacts the sliding surface of the contact wire, which has a rough surface (micro-rugged surface) due to the sliding of the current collection shoe, so the measurement speed is low. This not only makes the measurement work inefficient, but also includes errors in the measuring roller itself (so-called design tolerances), errors due to wear of the rollers and pick-ups due to long-range measurements, and errors in the contact wire. Jumping errors due to the surface roughness of the sliding surface or grease adhesion, and errors due to the contact position of the measuring roller or pick-up to the contact wire (problems may occur if the measuring roller or pick-up always moves in contact with the average wear position of the contact wire) However, if the sliding surface of the contact wire is worn one-sidedly, if the contact wire is shifted to the left or right, the amount of wear may be measured as being too large or too small compared to the actual amount. was difficult to measure.

[Problems to be Solved by the Invention] Therefore, the present invention provides a contact wire wear measurement that makes it possible to quickly perform precise and reliable measurement of wear amount while minimizing the above-mentioned measurement errors. The task is to provide equipment.

[Means for Solving the Problems] The contact wire wear measuring device of the present invention has a measuring arm that projects from the upper part of the measuring wheel so as to be rotatable up and down and left and right, and a rotary base metal fitting is rotatably supported at the tip of the measuring arm.
On the rotating base fitting, two reference rollers each having a groove portion that engages the arcuate surfaces on both sides of the contact wire to be measured are spaced apart by a predetermined interval by a roller frame that is rotatable with respect to the rotating base fitting. A non-contact displacement sensor is mounted on one of the roller frames so as to face the contact sliding surface of the contact wire to be measured that passes between the two reference rollers. A guide roller made of resin is attached to the reference roller frame located at , which serves as a guide for the reference roller supported by the roller frame while being held by a contact wire. In front of the non-contact displacement sensor, a protector made of a mechanically strong resin roller is installed slightly above the contact wire to protect the reference roller, non-contact displacement sensor, and guide roller. By running the measuring car, the displacement between the contactless sliding surface and the non-contact displacement sensor due to changes in the amount of wear on the contact wire is continuously calculated using a self-recording measurement recorder along with the running position of the measuring car. The present invention is characterized in that it is configured so that the wear amount can be measured and recorded continuously over the entire length of the measurement section of the contact wire.

[Examples] Hereinafter, the present invention will be explained in detail with reference to Examples shown in the drawings.

As shown in FIGS. 1, 2, and 4, the contact wire 1 is moved at a constant distance by two reference rollers 2, which are held between circular arc surfaces 101, 101 on both sides of the contact wire 1. One reference roller frame 4b having a guide roller 8 and a protector 3c
, a non-contact displacement sensor 5 is attached so as to face the contact sliding surface 102 of the contact wire 1 in a non-contact manner. The displacement between the contact wires 1 and the running position of the measuring vehicle is continuously calculated and recorded by a self-recording recorder, and the amount of wear can be continuously measured and recorded over the entire length of the measurement section of the contact wire 1. .

In the above, the traveling position of the measuring vehicle is determined by non-contact displacement using a self-recording measurement recorder that uses pulse signals from, for example, an encoder (a device that encodes electrical signals or converts them into other signal formats) connected to its axle. Arithmetic processing is performed together with the eddy current loss information from the sensor 5, and the amount of wear is recorded together with the traveling position.

Further, the guide roller 8 is made of resin such as MC nylon, and has the function of constantly pinching the contact wire 1 and guiding the reference roller 2.

Each protector 3a, 3b, 3c is composed of a roller made of resin with strong mechanical strength such as MC nylon.
are the reference rollers 2, 2 and the non-contact displacement sensor 5.
In addition, the guide rollers 8 are provided before and after the guide roller 8, slightly floating above the contact wire 1, and are used to remove abnormal objects near the contact wire 1. It protects the displacement sensor 5, guide roller 8, etc.

Reference numeral 6 denotes a rotary base metal fitting rotatably supported at the tip of a measuring arm 9 which is protruded from the top of a measuring cart (not shown) so as to be rotatable vertically and horizontally. , 2 roller frames 4a, 4b are rotatably supported.

Further, as shown in FIG. 3, the measuring arm 9 is mounted on a support base 11 of the trolley so as to be rotatable vertically and horizontally, and is attached to the reference roller frame 4 by means of a support spring 10 on the contact wire 1.
It is provided so as to press against a and 4b. 7
is a connection terminal to a wear amount self-recorder (not shown in the drawing).

In order to measure the amount of wear on the contact wire 1 using the contact wire wear measuring device of the present invention, as shown in FIG. roller 2,
2 and guide roller 8 from below.

Note that the measuring vehicle was run in the direction of arrow P shown in FIG.

As shown in FIG. 4, the reference rollers 2, 2 are rotated by sandwiching the arcuate surfaces 101, 101 on both sides of the non-sliding surface of the contact wire 1 through their interlocking grooves 201, and rotate the reference roller frames 4a, 4b. is moved while always keeping a constant distance from the contact wire 1. This is because the trolley (current collection shoe) does not slide on the arcuate surfaces 101, 101 on both sides of the contact wire 1, so it maintains a constant diameter without wearing out, and it always moves a constant width while being in contact with the trolley. This is because the axes of the contact wire 1 and the reference roller 2 are always kept at a constant distance from each other by the reference roller 2 having the holding groove 201.

In this way, the non-contact displacement sensor 5 attached to the reference roller frame 4b
As long as a and 4b move along the contact wire 1, they will always maintain a constant distance from the contact wire 1.

Next, along the trolley wire 1, the reference roller frame 4a,
4b moves and reaches a place where the contact wire 1 is worn, the distance between the non-contact displacement sensor 5 and the contact sliding surface of the contact wire 1 changes according to the amount of wear, and the contact wire 1 is worn. The mold displacement sensor 5 reads the amount of change.

For example, when an eddy current detection type non-contact displacement sensor is used as the non-contact displacement sensor 5, when high-frequency oscillation is applied to the non-contact displacement sensor 5 by a high-frequency oscillator, a high-frequency magnetic field is generated, and the non-contact type An eddy current flows through the metal near the displacement sensor 5, that is, the contact wire 1, in a direction perpendicular to the passage of the magnetic flux, resulting in an eddy current loss.

This eddy current loss increases as the distance between the contact wire 1 and the non-contact displacement sensor 5 becomes closer, and the oscillation amplitude gradually decreases. The separation distance and the oscillation amplitude form a curve that is nearly directly proportional.

This high-frequency oscillation is detected and linearized as a voltage proportional to the distance, and a self-recording measurement recorder is used to detect the change in the separation distance between the contact wire 1 and the non-contact displacement sensor 5, that is, the change in the wear amount of the contact wire 1. ,
This allows continuous recording of calculations.

In the above embodiment, the non-contact displacement sensor 5 is attached to the roller frame 4b of one reference roller 2 with a set screw 501, but this displacement sensor 5 is attached to the mounting base of the other reference roller 2. It may be provided directly on the rotating base metal fitting 6.

Further, in the above embodiment, an eddy current detection type displacement sensor is used as the non-contact type displacement sensor 5, but it goes without saying that a capacitance detection type displacement sensor may be used in the present invention.

[Effects of the Invention] Since the contact wire wear measuring device according to the present invention is configured as described above, it exhibits various effects listed below.

Since the wear amount of the contact wire is fixed without contact, even if the sliding surface of the contact wire is rough, the measurement sensor will not jump due to the roughness, so the speed of the measurement vehicle can be increased, and This makes it possible to speed up measurement work, and it can withstand long-term use.

Unlike conventional contact type sensors, there is no risk of the sensor being worn out, so there is no measurement error caused by sensor wear, and it is possible to measure the wear amount of the contact wire with high accuracy. If wear is measured by the amount of change in eddy current loss of the contact wire caused by high-frequency oscillation, as shown in the example, even if the contact wire is worn out on one side, it can be measured as an average separation distance, which is more advantageous. Become.

Because the two reference rollers are independently supported by rotatable roller frames,
The direction of each roller axis, that is, the contact wire clamping groove, is free to change direction, and the contact wire to be measured is placed in a zigzag pattern on the overhead wire (generally, the contact wire is placed in sliding contact with the sliding surface of the pantograph of the train to avoid local wear. Even if the trolley wire is connected in a zigzag manner, the reference roller can be smoothly passed over the contact wire to be measured, and there is no risk of disturbing the measurement accuracy. Incidentally, if the two reference rollers are integrated, when passing through the zigzag-shaped overhead line, the reference roller will pass through even if it is shifted downward from the predetermined position due to the integration, resulting in poor measurement accuracy. Not only is this turbulent, but it may also cause vertical vibration, causing the reference roller to separate from the contact wire and making measurement impossible.

Since the guide roller made of resin that pinches the contact wire is used as a guide for the reference roller, the presence of this guide roller allows the pinching operation of the reference roller to the arcuate surfaces on both sides of the contact wire to be performed smoothly and stably. , there is no damage to the trolley wire clamping groove of the reference roller, which is the main part of the measurement.

Protectors made of resin rollers with strong mechanical strength are installed at the front and rear positions of the reference roller and at the front position of the non-contact displacement sensor, so when the measuring device is brought into contact with the contact wire at the beginning of measurement work, the It is possible to adopt a method in which either one of the protectors located before or after the contact wire is brought into contact with the contact wire, and then the two reference rollers and the guide roller are brought into contact with the contact wire. You can also eliminate things. Therefore, the reference roller and the non-contact displacement sensor can be effectively protected. Note that since these protectors are provided slightly above the contact wire, they do not have any effect on wear measurement.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the main parts of the contact wire wear measuring device according to the present invention, FIG. 2 is a front view of the same, and FIG. FIG. 4 is an explanatory diagram showing a state in which the contact wire and the reference roller are clamped together. 1 is a contact wire, 101, 101 are arcuate surfaces on both sides,
102 is a trolley sliding surface, 2, 2 is a reference roller, 2
01 is a clamping groove, 3a, 3b, 3c are protectors,
4a and 4b are reference roller frames, 5 is a non-contact displacement sensor, 7 is a connection terminal to an automatic measurement and recording device, 8 is a guide roller, 9 is a measuring arm, 10 is a support spring, 11 is a support stand for the cart, 12 is a rope.

Claims (1)

[Claims] 1. A rotating base metal fitting is rotatably supported at the tip of a measuring arm that protrudes from the top of the measuring wheel so as to be able to freely rotate vertically and horizontally, and on the rotating base metal fitting, a measuring arm that is clamped on both arcuate surfaces of the contact wire to be measured is mounted. Two reference rollers each having a groove are supported at a predetermined distance by a roller frame which is rotatable relative to the rotary base fitting, and either one of the roller frames is provided with the two reference rollers. A non-contact displacement sensor is installed so as to face the contact sliding surface of the contact wire to be measured that passes between the reference rollers, and a displacement sensor is attached to the reference roller frame located on the front side by being held by the contact wire. A guide roller made of resin is attached to guide the supported reference roller, and the reference roller and the non-contact displacement sensor are installed in front and rear positions of the two reference rollers and in front of the non-contact displacement sensor. In addition, a protector made of a mechanically strong resin roller to protect the guide roller is installed slightly above the contact wire, and by running the measurement vehicle, changes in the wear amount of the contact wire can be measured. The displacement between the sliding surface of the trolley and the non-contact displacement sensor is continuously calculated and recorded by a self-recording recorder along with the traveling position of the measuring vehicle. A contact wire wear measuring device characterized by being configured to be able to measure and record amounts.