JP3863361B2 - Measuring probe for electrical measurement of railway rails - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measurement probe for electrical measurement of a railroad rail, which can be suitably used when measuring electrical variables such as voltage, current, resistance, etc. while being fixed to the railroad rail.
[0002]
[Prior art]
Usually, when measuring electrical variables such as voltage, current, resistance, etc. of the object to be measured, as shown in FIG. This is done by pressing each of the three measurement points separately.
[0003]
[Problems to be solved by the invention]
However, the measurement work performed by pressing the measurement probe 1 against the measurement point of the object 3 to be measured is because the measurement operator makes the measurement probe 1 contact the object 3 with the power of the hand. The optimum contact pressure is not always obtained, and the contact resistance at that time also varies, resulting in inconvenience that the measured value obtained is not stable.
[0004]
In particular, when the object to be measured is a railroad rail, if a relatively large measurement probe is pressed against the measurement point with only hand force without mechanical force, only contact resistance corresponding to the pressing force is obtained. There is also a problem that the contact resistance cannot be reduced as a result.
[0005]
In addition, the rails that are laid are usually rusted except for the top surface where the wheels frequently pass, so that the measurement probe can be in electrical contact with a predetermined measurement point. There was also a complication that had to be removed in advance.
[0006]
In view of the above problems found in the prior art, the present invention ensures that the electrical contact state is reduced while reducing the contact resistance by always contacting the measurement probe to the measurement point of the object to be measured with a constant pressure contact force. And it aims at providing the measurement probe for the electrical measurement of a railroad rail which can be obtained stably.
[0007]
[Means for Solving the Problems]
The present invention has been made to achieve the above object, and the constitutional feature of the first invention is that the top part of the rail is perpendicular to the length direction of the rail having a substantially E-shaped cross section. A probe having a substantially U-shaped cross section comprising an abutment portion placed on the contact portion and a pair of side abutting portions that are separately provided from the corresponding contact portion and are arranged to face both side surfaces in the length direction of the top portion. It is constituted by a main body and a conductive screw rod formed so as to be freely press-contacted to the side surface of the top portion by screwing closely with a female screw hole provided on at least one side of the side pad portion. .
[0008]
Further, the structural feature of the second invention is that the abutting portion arranged facing the top surface of the top portion in a positional relationship orthogonal to the length direction of the railroad rail having a substantially E-shaped cross section and the corresponding contact. A probe main body having a substantially U-shaped cross-section comprising a pair of side abutting portions that are provided separately from each other and are arranged to face both side surfaces in the length direction of the top portion, and a female screw provided in the contact portion Conductive screw rods that are screwed into close contact with the hole to freely press-contact the top surface to the top surface, and screwed into close contact with female screw holes provided on at least one side of the side pad portion. This is because the pressure contact with the side surface of the top portion is constituted by a conductive screw rod formed freely.
[0009]
In this case, In any of the above invention, before Kishirube conductive threaded rod may be formed by freely point contact via a dome portion that substantially swelled in hemisphere shape to the contact side.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory diagram showing an example of the first invention of the present invention in relation to a railroad rail, and the entire measurement probe 11 is attached to the railroad rail 31 side to be measured 3. And a conductive screw rod 22 used to fix the probe main body 12 to the rail 31 side.
[0011]
Among these, the probe main body 12 includes the contact portion 13 placed on the top surface 33 of the top portion 32 in a positional relationship orthogonal to the length direction of the rail 31 having a substantially E-shaped cross section, and the corresponding contact. A pair of side abutting portions 14, 15 that are vertically suspended from the portion 13 and are arranged facing both side surfaces 34 in the length direction of the top portion 22 are formed in a substantially U-shaped cross section.
[0012]
Moreover, the probe main body 12 is for the Shinkansen whose maximum standard is the distance between the inner side surfaces 14a and 15a of the side pad portions 14 and 15 from the viewpoint of providing versatility applicable to all railroad rails 31 having different standards. It is preferable to provide the clearance t in advance so as to be slightly longer than the lateral width (rail width) of the top portion 32 of the railway rail 31.
[0013]
Moreover, a female screw hole 16 that can be screwed with the conductive screw rod 22 is provided in at least one side of the side pad parts 14 and 15, that is, the side pad part 15 located on the right side in the illustrated example. ing. Note that the female screw hole 16 can be provided in both the side pad portions 14 and 15 as necessary.
[0014]
On the other hand, the conductive screw rod 22 formed by the head portion 23 and the male screw portion 24 has the male screw portion 24 screwed into close contact with the female screw hole 16 and has a distal end surface 25 on the side surface 34 side of the top portion 32 of the rail 31. It is formed so as to be able to press-contact through.
[0015]
In this case, as the conductive screw rod 22, one having a relatively flat tip surface 25 of the male screw portion 24 as shown in FIG. 2A can be used, and the tip end as shown in FIG. It is also possible to use a surface provided with a dome portion 27 further bulged in a substantially hemispherical shape on the surface 25.
[0016]
Further, the male screw portion 24 in the conductive screw rod 22 has a top portion 32 even when the longest clearance t is formed by installing the probe main body 12 on the rail rail 31 having the minimum rail width. The side surface 34 is formed with a length sufficient to ensure press contact with the side surface 34.
[0017]
FIG. 3 is an explanatory view showing an example of the second invention of the present invention in relation to the railroad rail, and the entire measurement probe 11 has a substantially E-shaped cross section. The abutment portion 13 that faces the top surface 33 of the top portion 32 in a positional relationship orthogonal to the length direction of the top portion 32, and both side surfaces 34 in the length direction of the top portion 32 that are separately provided from the corresponding contact portion 13. The probe main body 12 having a substantially U-shaped cross section composed of a pair of side abutting portions 14, 15 arranged facing each other, and the top surface 33 of the top portion 32 in screw contact with the female screw hole 17 provided in the contact portion 13. The conductive screw rod 22 that is freely press-contacted to the top side 32 and the top screw 32 are screwed into close contact with at least one side of the side pad parts 14, 15, for example, the female screw hole 16 provided in the side pad part 15. Conductivity that can be freely pressed against the side 34 It is composed of a rod 22. 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 the other invention Since the configuration is the same as that of the first invention described above, description thereof 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. 1 and 2 screwed into the female screw hole 16 of the side pad portion 15. Things are used.
[0018]
Next, the operation of the first invention among the above-described inventions will be described. For example, when measuring electrical variables such as voltage, current, and resistance, first, for example, the joint of the rail 31 is positioned. The abutting portion 13 arranged in the direction orthogonal to the length direction is arranged at the top portion 32 while the side pad portions 14 and 15 are arranged in a direction along the length direction at a predetermined measurement position such as the vicinity of the portion to be performed. The probe body 12 is placed on the top surface 33 of the probe.
[0019]
Thereby, each of the abutting portions 14 and 15 in the probe main body 12 is disposed on the side surface 34 of the top portion 32 of the rail 31 so as to face each other.
[0020]
Next, the male screw portion 24 of the conductive screw rod 22 is screwed into the female screw hole 16 in the side abutting portion 15 of the probe main body 12, and the head 32 is sandwiched with a tightening instrument such as a spanner and sent while being rotated. The front end surface 25 is brought into contact with the side surface 34 of the top portion 32 of the rail 31.
[0021]
In this state, when the tightening device is further turned strongly, the male screw portion 24 of the conductive screw rod 22 is forcibly fed, so that the end surface 25 strongly presses the side surface 34 of the rail 31 so that the conductive screw rod 22 moves to the opposite side. The positioned side pad 14 is relatively moved and comes into pressure contact with the side surface 34 of the rail 31 that faces the rail pad.
[0022]
As a result, the probe main body 12 has the contact portion 13, the abutting portion 14, and the conductive screw rod 22 in a state where a clearance t is formed between the abutting portion 15 and the side surface 34 of the railroad rail 31. It is securely fixed to the rail 31 side while being supported from three directions with the front end surface 25 of the rail. For example, when the conductive screw rod 22 having a relatively flat tip surface 25 shown in FIG. 2A is used, the side surface 34 of the rail 31 and the tip surface 25 of the conductive screw rod 22 are used. From the standpoint of further reducing the contact resistance between the front end surface 25 and the front end surface 25, it is desirable that the side surface 34 of the portion in contact with the front end surface 25 be well polished in advance to remove rust.
[0023]
Thus, after the measurement probe 11 is installed on the railway rail 31, if power is supplied from the conductive screw rod 22 side, the contact resistance of the railway rail 31 is further reduced through the tip face 25. Current can be passed to the side. On the other hand, the current flowing in the rail 31 is on the side of the conductive screw rod 22 in a state in which the contact resistance is further reduced through the tip surface 25 pressed against the side surface 34 that has been rusted. And can be fed to the side of a separately prepared measuring instrument via a lead wire (not shown) connected to the head 23 of the conductive screw rod 22.
[0024]
At this time, when the conductive screw rod 22 having the dome portion 27 as shown in FIG. 2B is used on the front end surface 25, the apex 27 a of the dome portion 27 is set to the side surface 34 of the rail 31. Since contact can be made in a point contact state, the contact resistance can be more reliably reduced.
[0025]
Further, when the probe body 12 is formed with a clearance t applicable to various types of railway rails 31, the same measurement probe 11 can be installed for all railway rails 31 having different standards. Because you can, you can increase the versatility.
[0026]
Furthermore, when the female screw holes 16 are provided in both the side pad portions 14 and 15, the female screw holes 16 positioned on the optimum side in relation to the situation at the time while flexibly responding to the work environment at the site. Thus, the conductive screw rod 22 can be screwed and the working efficiency can be increased accordingly.
[0027]
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 is set to the top surface of the top portion 32. In the state of contact with 33, the conductive screw rod 22 is tightened and screwed into the female screw hole 16 of the side pad 15 by following the same procedure as in the first invention, and finally screwed into the contact portion 13. The attached conductive screw rod 22 is tightened. As a result, the probe main body 12 has the conductive screw rod 22 screwed to the contact portion 13 in a state where a clearance t is formed between the side pad portion 15 and the side surface 34 of the rail 31. Certainly on the side of the rail 31 under the condition that the front end surface 25, the side pad 14 and the front end surface 25 of the conductive screw rod 22 screwed to the side pad 15 are supported from three directions. It will be fixed.
[0028]
As a result, the conductive screw rod 22 screwed into the female screw hole 17 of the contact portion 13 is repeatedly stepped on the wheels of the passing train so that the tip surface 25 comes into contact with the top surface 32 having less rust than the side surface 34. be able to. Therefore, if power is supplied from the conductive screw rod 22 side, current can be passed to the rail rail 31 side through the tip surface 25 in a state where the contact resistance is more reliably reduced. On the other hand, the current flowing in the rail 31 is electrically conductive screw rod 22 in a state in which the contact resistance is more preferably reduced through the tip surface 25 pressed against the top surface 32 with little rust. And can be fed to the side of a separately prepared measuring instrument via a lead wire (not shown) connected to the head 23 of the conductive screw rod 22.
[0029]
【The invention's effect】
As described above, according to the present invention, the measurement probe can be securely fixed to the rail rail side while being supported from three directions through the clearance, so that a constant contact pressure is always secured. It is possible to make electrical contact with a rail as a measurement object under contact resistance without variation.
[0030]
In particular, according to the second invention, the conductive screw rod screwed into the female screw hole of the contact portion can be repeatedly stepped on the wheels of the passing train to contact the top surface with less rust, and the measurement probe portion can be Electrical contact can be made under better conditions on the rail side.
[0031]
In addition, when using a conductive screw rod having a dome formed on the front end surface, the contact resistance can be reduced more reliably because the dome can be pressed against the rail side while being in point contact. be able to.
[0032]
In addition, if the probe body has clearances applicable to various types of railroad rails, the same measurement probe can be installed on all railroad rails with different standards, thus increasing versatility. I can do it.
[0033]
If female screw holes are provided on both sides, the conductive screw hole can be screwed using the female screw hole located on the optimum side in relation to the situation at that time. Efficiency can be increased.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of a first invention according to the present invention in relation to a railroad rail.
FIGS. 2A and 2B are explanatory views showing structural examples of conductive screw rods constituting the present invention as patterns (a) and (b).
FIG. 3 is an explanatory diagram showing an example of a second invention according to 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 side surface 16,17 Female screw hole 22 Conductive screw rod 23 Head 24 Male screw part 25 Front end surface 27 Dome part 27a Vertex 31 Railway rail 32 Top 33 Top 34 Side

Claims (3)

  The abutting portion placed on the top surface of the top portion in a positional relationship orthogonal to the length direction of the railroad rail having a substantially E-shaped cross section, and the length of the top portion separately suspended from the corresponding contact portion A probe body having a substantially U-shaped cross-section composed of a pair of side abutting portions facing each other on both side surfaces in the vertical direction, and a female screw hole provided on at least one side of the side abutting portion and screwed tightly A measuring probe for electrical measurement of a railroad rail, comprising a conductive screw rod that is formed so as to be freely press-contacted to the side surface of the top portion.   The abutting portion arranged to face the top surface of the top portion in a positional relationship orthogonal to the length direction of the railroad rail having a substantially E-shaped cross section, and the length of the top portion separately suspended from the corresponding contact portion The probe main body having a substantially U-shaped cross section composed of a pair of side abutting portions arranged opposite to each other in the direction and the female screw hole provided in the abutting portion are screwed into close contact with the top surface of the top portion. A conductive screw rod that is freely press-contacted and a female screw hole provided on at least one side of the side abutting portion and screwed into close contact with the side surface of the top portion. A measuring probe for electrical measurement of railway rails, characterized by comprising conductive screw rods. The railway rail according to claim 1 or 2, wherein the conductive screw rod is formed so as to be freely point-contactable through a dome portion bulged in a substantially hemispherical shape toward the contact side. Measuring probe for electrical measurement.

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