JP2002096731A - Measurement probe for electrically measuring rail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measurement probe for electrically measuring a rail, capable of surely and stably keeping electrical contact while reducing contact resistance by putting the measurement probe in contact at a constant pressure all times. SOLUTION: The measurement probe comprises a probe body 12 formed in an approximately sectional U-shape, consisting of a contact part 13 mounted on a top 32 of a rail 31 in positional relationship perpendicular to the longitudinal direction thereof and a pair of auxiliary supporting parts 14, 15 separately hung from the contact part 13 and opposed to both side faces 34 of the top 32 in the longitudinal direction, and a conductive screw bar 22 to be threaded and closely applied to a tapped hole 16 provided in at least one of the auxiliary supporting parts 14, 15 and adapted to be pressed against a side face 34 of the top 32. A tapped hole is also provided in the contact part 13 and the conductive screw bar can thus be threaded in press contact with a top face 33 of the top 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring probe for electric measurement of railway rails, which can be suitably used when measuring electric variables such as voltage, current, resistance and the like by fixing to railway rails.

[0002]

2. Description of the Related Art Normally, when measuring electrical variables such as voltage, current and resistance of an object to be measured, as shown in FIG. 1 is pressed against each measurement point of the DUT 3 individually.

[0003]

However, the measuring operation performed by pressing the measuring probe 1 individually on the measuring points of the DUT 3 requires the measuring probe 1 to be manually operated by hand.
Is brought into contact with the object 3 to be measured, so that the optimum contact pressure is not always obtained, and the contact resistance at that time also varies, and the resulting measured value is not stable. there were.

[0004] In particular, when the object to be measured is a railroad rail, if a relatively large measuring probe is pressed against the measuring point only by hand without mechanical force, contact corresponding to the pressing force is caused. There is also a problem that only resistance can be obtained, and as a result, contact resistance cannot be reduced.

[0005] In addition, the surface of the laid railway rail is usually rusted except for the top surface through which wheels frequently pass, and the measuring probe is reliably brought into electrical contact with a predetermined measuring point. In order to do so, it was necessary to remove rust beforehand.

The present invention has been made in view of the above-mentioned problems in the prior art, and has a measurement probe always in contact with a measurement point of an object to be measured with a constant pressure contact force, thereby reducing the contact resistance and maintaining an electrical contact state. It is an object of the present invention to provide a measurement probe for electric measurement of a railroad rail, which can surely and stably obtain a railroad rail.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the first feature of the present invention is the length of a railway rail having a substantially E-shaped cross section. A contact portion placed on the top in a positional relationship perpendicular to the direction, and a pair of side contact portions that are separately provided from the corresponding contact portion and disposed on both side surfaces in the length direction of the top. A probe main body having a substantially U-shaped cross section, and a conductive member formed so as to be freely press-contacted to the side surface of the top portion by being screwed into close contact with a female screw hole provided on at least one side of the side contact portion. It consists of a screw rod.

The second aspect of the present invention is characterized in that a contact portion disposed on the top surface of the rail in a positional relationship orthogonal to the longitudinal direction of the rail having a substantially E-shaped cross section is provided. ,
A probe body having a substantially U-shaped cross-section, comprising a pair of side contact portions which are separately provided from the corresponding contact portions and are disposed on both side surfaces in the length direction of the top portion, and provided on the contact portion. A conductive screw rod formed so that the top portion can be freely pressed into contact with the top surface by being screwed into close contact with the female screw hole; and a female screw hole provided on at least one side of the side contact portion. The top portion is configured to be freely pressed against the side surface by a conductive screw rod formed freely.

In this case, in any of the above inventions,
It is preferable that the probe body is formed so as to have a size which can correspond to at least the rail width of the rail for the Shinkansen. In addition, the conductive screw rod can be formed so as to be freely point-contacted through a dome portion bulging substantially in a hemispherical shape toward the contact side.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing an example of the first invention of the present invention in relation to a railroad rail. A probe body 12 made of a conductive material attached to the side of the railway rail 31;
And a conductive screw rod 22 used for fixing to one side.

The probe body 12 has a contact portion 13 mounted on a top surface 33 of a top portion 32 in a positional relationship orthogonal to the longitudinal direction of the rail 31 having a substantially E-shaped cross section. A pair of armrests 14 and 15 which are provided separately from the corresponding contact portion 13 and are disposed facing both side surfaces 34 in the longitudinal direction of the top 22 are formed to have a substantially U-shaped cross section.

The probe body 12 has inner side surfaces 14a, 15a of the armrest portions 14, 15 from the viewpoint of providing versatility applicable to all railway rails 31 having different standards.
aRailway 3 for Shinkansen with maximum spacing between each other
It is preferable that a clearance t be provided in advance so as to be slightly longer than the lateral width (rail width) of the top 32 of the first member.

In addition, a female screw hole 16 into which the conductive screw rod 22 can be freely screwed is provided in at least one of the side contact portions 14 and 15, that is, on the right side in the illustrated example. Is provided. In addition, the female screw hole 16 can be provided in both the side contact portions 14 and 15 as necessary.

On the other hand, the conductive screw rod 22 formed by the head portion 23 and the male screw portion 24 forms the male screw portion 24 with the female screw hole 16.
The rail 32 is formed so that it can be pressed into contact with the side surface 34 of the top portion 32 of the rail 31 via the front end surface 25 thereof.

In this case, the conductive screw rod 22 is
As shown in FIG. 7A, a thread having a relatively flat distal end surface 25 of the external thread portion 24 can be used.
As shown in (b), a dome portion 27 which is further bulged in a substantially hemispherical shape on the distal end surface 25 may be used.

The male screw portion 24 of the conductive screw rod 22 can be formed even when the longest clearance t is formed by installing the probe main body 12 on a railway rail 31 having a minimum rail width. , Side 3 of top 32
4 is formed with a length sufficient to be able to reliably press-contact it.

FIG. 3 is an explanatory view showing an example of the second invention of the present invention in relation to a railroad rail. The whole of the measuring probe 11 has a substantially E-shaped cross section. The contact portion 13 that is disposed facing the top surface 33 of the top portion 32 in a positional relationship orthogonal to the length direction of the rail rail 31.
And a pair of armrests 1, each of which is vertically provided from the corresponding contact part 13 and is disposed on both side surfaces 34 in the longitudinal direction of the top 32.
A probe body 12 having a substantially U-shaped cross-section consisting of 4 and 15 and a conductive body formed so as to freely press and contact the top surface 33 of the top portion 32 by being screwed into close contact with the female screw hole 17 provided in the contact portion 13. The male screw rod 22 and at least one of the side contact portions 14 and 15, for example, the female screw hole 16 provided in the side contact portion 15 are screwed into close contact with each other to freely press the top portion 32 against the side surface 34. And a conductive screw rod 22 formed. In this case, the second invention differs from the first invention in that it has a conductive screw rod 22 that is screwed into the female screw hole 17 provided in the contact portion 13, but other components are different. Since the configuration is the same as that of the above-described first invention, the description is omitted. The conductive screw rod 22 screwed into the female screw hole 17 of the contact portion 13 is the same as the conductive screw rod 22 shown in FIGS. Things are used.

Next, the operation will be described with reference to the first embodiment of the invention described above as an example. When measuring electrical variables such as voltage, current, resistance, etc. The side contact portion 1 is located at a predetermined measurement position, such as near the position where the seam is located, and extends in a direction along the length direction thereof.
The probe body 12 is arranged by placing the contact portions 13 arranged in a direction orthogonal to the length direction on the top surface 33 of the top portion 32 while arranging the probe bodies 4 and 15.

As a result, each of the side contact portions 14 and 15 of the probe body 12 is arranged on the respective side surfaces 34 of the top portion 32 of the railway rail 31 in a mutually facing positional relationship.

Next, the side contact portion 15 of the probe body 12
The male screw portion 24 of the conductive screw rod 22 is screwed into the female screw hole 16 of the first embodiment. 32 against the side surface 34.

In this state, by further turning the tightening device, the conductive screw rod 22 is forcibly fed into the male screw portion 24, so that the distal end surface 25 of the conductive screw rod 22 strongly presses the side surface 34 of the railway rail 31. The railroad rail 31 in which the side contact portion 14 located on the opposite side relatively moves and faces.
Press contact with the side surface 34.

As a result, the probe main body 12 has the contact portion 13 and the side contact portion 1 with the clearance t formed between the side contact portion 15 and the side surface 34 of the rail 31.
4 and the tip surface 25 of the conductive screw rod 22 are securely fixed to the railway rail 31 under the state of being supported from three directions. For example, when a conductive screw rod 22 having a relatively flat distal end surface 25 shown in FIG. 2A is used, the side surface 34 of the rail 31 and the distal end surface 25 of the conductive screw rod 22 are used. From the viewpoint of further reducing the contact resistance between
It is desirable to polish well beforehand to remove rust.

After the measurement probe 11 is installed on the railroad rail 31, if power is supplied from the side of the conductive screw rod 22, the railroad rail is connected to the railroad rail 31 in a state where the contact resistance is further reduced via the tip surface 25. A current can flow on the side of the rail 31. On the other hand, the current flowing through the rail 31 is connected to the side of the conductive screw rod 22 under the condition that the contact resistance is further reduced through the front end surface 25 pressed against the rust-removed side surface 34. And can be sent to a separately prepared measuring instrument side via a lead wire (not shown) connected to the head 23 of the conductive screw rod 22.

At this time, the conductive screw rod 22 having a dome portion 27 as shown in FIG.
In the case where is used, since the pressure contact can be performed with the apex 27a of the dome portion 27 being in point contact with the side surface 34 of the railroad rail 31, the contact resistance can be reduced more reliably.

When the probe main body 12 is formed with a clearance t applicable to various railway rails 31, the same measuring probe 11 is installed on all the railway rails 31 having different standards. So that it can be more versatile.

Further, when the female screw holes 16 are provided in both the side contact portions 14 and 15, the female screw holes 16 are located on the optimum side in relation to the situation at the time while flexibly corresponding to the work environment at the site. The conductive screw rod 22 is formed using the female screw hole 16.
Can be screwed on, and the working efficiency can be increased accordingly.

On the other hand, in the case of the second invention shown in FIG. 3, first, the conductive screw rod 22 is screwed into the female screw hole 17 provided in the abutting portion 13 and the tip end surface 25 thereof is fixed to the top portion 32.
In the state where the conductive screw rod 22 is in contact with the top surface 33, the conductive screw rod 22 is tightly screwed into the female screw hole 16 of the side contact portion 15 by following the same procedure as in the first invention. The conductive screw rod 22 screwed to the screw 13 is tightened. As a result, the probe main body 12 is provided with the conductive screw rod 22 screwed to the contact portion 13 under the condition that the clearance t is formed between the side contact portion 15 and the side surface 34 of the railway rail 31. A tip surface 25;
It is securely fixed to the rail rail 31 under the state of being supported in three directions by the side contact portion 14 and the distal end surface 25 of the conductive screw rod 22 screwed to the side contact portion 15. Become.

As a result, the conductive screw rod 22 screwed into the female screw hole 17 of the contact portion 13 is repeatedly stepped on by the wheels of the passing train, and the tip surface 25 of the top surface 32 is less rusted than the side surface 34. Can be contacted. Therefore, if power is supplied from the side of the conductive screw rod 22, a current can be made to flow to the rail rail 31 via the distal end surface 25 while the contact resistance is more reliably reduced. Conversely, the current flowing through the rail 31 is applied to the conductive screw rod 22 under the condition that the contact resistance is more preferably reduced through the tip surface 25 pressed against the top surface 32 with less rust. And can be sent to a separately prepared measuring instrument side via a lead wire (not shown) connected to the head 23 of the conductive screw rod 22.

[0029]

As described above, according to the present invention, the measuring probe can be reliably fixed to the railroad rail side while being supported from three directions via the clearances, so that a constant contact can be obtained. It is possible to make electrical contact with the railway rail as the object to be measured under the contact resistance without variation while securing the pressure.

In particular, according to the second aspect of the invention, the conductive screw rod screwed into the female screw hole of the contact portion can be repeatedly stepped on the wheel of the passing train to make contact with the rust-free top surface. The plow part can be brought into electrical contact with the rail rail under favorable conditions.

Further, when a conductive screw rod having a dome portion formed on the tip end surface is used, the dome portion can be pressed against the railroad rail with the dome portion being in point contact, so that the contact resistance can be more surely increased. Can be reduced.

Further, when the probe body is provided with a clearance applicable to various railway rails,
The same measuring probe can be installed on all railway rails having different standards, and the versatility can be improved accordingly.

In the case where the female screw holes are provided in both of the side contact portions, the conductive screw rod can be screwed using the female screw hole located on the optimum side in relation to the situation at the time. , It can increase work efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of the first invention in the present invention in relation to a railroad rail.

FIGS. 2A and 2B are explanatory diagrams showing examples of the structure of a conductive screw rod constituting the present invention for each pattern as FIGS.

FIG. 3 is an explanatory view showing an example of the second invention in the present invention in relation to a railroad rail.

FIG. 4 is an explanatory diagram showing an arrangement relationship between an object to be measured and a measurement probe according to a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Measurement probe 12 Probe main body 13 Contact part 14, 15 Side contact part 14a, 15a Inner surface 16, 17 Female screw hole 22 Conductive screw rod 23 Head 24 Male screw part 25 Tip surface 27 Dome 27a Vertex 31 Railway rail 32 Top 33 Top 34 Side

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Toyama 81, Sakuramachi, Koizumi, Ueda-shi, Nagano Prefecture Within Hioki Electric Co., Ltd. (72) Inventor Tetsuya Ito 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Within the Japan Railway Company (72) Shohei Kanari Inventor 1-term Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture

Claims (4)

[Claims] 1. A contact portion mounted on a top surface of a top portion of a railway rail having a substantially E-shaped cross section in a positional relationship orthogonal to a length direction of the rail, and each of the contact portions is vertically suspended from the contact portion. A probe main body having a substantially U-shaped cross-section comprising a pair of armrests disposed on both sides in the longitudinal direction of the top, and a female screw provided on at least one side of the armrests A measuring probe for electric measurement of railroad rails, comprising: a conductive screw rod formed so as to be screwed into close contact with a hole to freely press against the side surface of the top. 2. A contact portion disposed on the top surface of a top portion of the railway rail having a substantially E-shaped cross section in a positional relationship orthogonal to the longitudinal direction thereof, and each of the abutting portions is vertically suspended from the corresponding contact portion. A probe body having a substantially U-shaped cross section including a pair of armrests arranged on both sides in the longitudinal direction of the top,
A conductive screw rod formed so that the top portion can be freely pressed into contact with the top surface by being screwed into close contact with a female screw hole provided in the contact portion; and a conductive screw rod provided on at least one side of the side contact portion. A conductive screw rod which is screwed into close contact with the female screw hole to freely press-contact the side surface of the top portion. 3. The railway rail according to claim 1, wherein the probe main body is formed to have a size corresponding to at least a rail width of various rails. Measuring probe. 4. The conductive screw rod according to claim 1, wherein the conductive screw rod is formed so as to be capable of making a point contact via a dome portion which protrudes in a substantially hemispherical shape toward the contact side. A measurement probe for electrical measurement of a railway rail according to any one of the above.