JPH0342362Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a signal measurement electrode suitable for use when measuring insufficient penetration in a welded portion of a tube, for example, by a potentiometric method or the like.

[Prior Art] Conventionally, when measuring the amount of insufficient penetration of a weld in the circumferential direction of a pipe in which two pipes are joined by welding means in a pipeline or the like, an operator measures the weld and After cleaning the area near the weld, install a pair of voltage measurement electrodes equidistantly across the weld and a pair of current supply electrodes outside these electrodes, and then A predetermined current is passed through the tubular body, and the potential difference is measured using another pair of voltage measuring electrodes across the welded portion to measure the amount of weld penetration insufficient.

[Problem that the invention attempts to solve]

However, the above-mentioned potential difference measuring means requires the operator to clean the surface of the tube so that the contact resistance between the electrode and the tube is stable and small, and the operator must directly hold the electrode when installing it. However, if the tube surface is not cleaned, the contact condition will become unstable due to coating, corrosion, or other irregularities, and the contact resistance will fluctuate, making it difficult to accurately measure the potential difference. cannot be measured.

The present invention was developed in view of the above points, and it can be installed on the surface of the object to be measured in a stable state without requiring cleaning by an operator even if the surface of the object to be measured is in bad condition. It is an object of the present invention to provide a signal measurement electrode that allows the electrode to be installed by operation and allows signal measurement work to be performed easily and inexpensively.

[Means for Solving the Problems] The present invention, as a means to solve the above-mentioned problems, has an opening at the tip of an electrode that is brought into contact with the surface of a conductive object to be measured to measure a desired signal. A cylindrical electrode case with an opening, a predetermined flow path formed inside this electrode case, a conductive fluid filled in this flow path, and a conductive fluid contained inside the tip of the electrode case. A movable body has a needle protruding from an opening that moves in a protruding and retracting manner, and a hole is formed inside. Fluid is caused to flow from the hole through the case opening onto the surface of the object to be measured, and a stable contact state is created via this conductive fluid to perform signal measurement.

[Effect]

Therefore, by taking the above measures,
During signal measurement, conductive fluid flows from the outside through the electrode case and connects the measured object and the electrode contact part, so even if the surface condition of the measured object is poor, a tight connection can be achieved. By detecting the measurement location, electrodes can be automatically installed on the surface of the object to be measured.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In these figures 1
0 indicates a pipe body as a measurement target constructed as a pipeline, for example, of which the side 10a is the outside and the side 10b is the inside. usually,
The two tube bodies 10, 10 of a predetermined length are joined by welding portions 11 applied by welding means to the opposing surfaces of both tube bodies, so that the weld portions 11 are formed in the circumferential direction of the tube bodies 10. That will happen. Inside the tube body 10 with the welded parts 11 as described above, a base (not shown) made movable by an automatic traveling trolley or other transportation means is provided with a predetermined interval as shown in FIG. It has a plurality of pairs of electrodes, that is, voltage measurement electrodes 20a, 20a and current supply electrode 20.
b, 20b are placed and moved at a predetermined speed while searching for the welded part 11. The search for the welded portion 11 is performed using, for example, an ultrasonic probe.

Therefore, the electrodes 20, 20a, 20b are
It has a cylindrical electrode case 22 in which a predetermined opening 21 is formed with the circular aperture portion at the tip as the central axis,
A channel 24 for filling conductive fluid 23 from the outside of the electrode is formed inside the electrode case 22, and a curved receiving portion 25 is communicated with the distal end side of this channel. A movable body 26 is housed in a space formed by the inside of the tip of the electrode case 22 and the curved receiving portion 25. This movable body 26
A needle body 27 is protruded outwardly from the tip opening 21 of the electrode case 22, and a hole 28 is formed inside in the same direction as the flow path direction.

Next, the operation of the signal measurement electrode configured as above will be explained. First, while moving an automatic traveling cart or a base in a predetermined direction inside or outside the tube body 10, an ultrasonic probe is used to detect, for example, the welded portion 11.
Explore. When the welding part 11 is detected by this search, the moving body stops moving after moving to a position where the voltage measurement electrodes 20a, 20a and the current supplying electrodes 20b, 20b are sandwiched at an equal distance from the welding part 11. In this way, each electrode 20a, 20a,
After positioning 20b and 20b, Fig. 2A
When the electrode case 22 is pressed from the outside in this state, since the tip of the needle body 27 is in contact with the surface of the object to be measured 10, the electrode case 22 moves forward as a whole, and the movable body 26 bends accordingly. It retreats toward section 25. At this time, the fluid 23 in the flow path 24 and the curved receiving part 25 passes through the hole 28 of the movable body 26 and passes through the tip opening 21 of the electrode case 22.
and leaks out to the outside, and as shown in Figure B, the object to be measured 1
At the same time, the movable body 26 comes into contact with the curved receiving part 25 inside the electrode case 22 and stops, thereby preventing the fluid 23 from flowing out. At this time, since the tip contact portion of the electrode case 22 that contacts the surface of the object to be measured is covered with the conductive fluid 23, the surface of the object to be measured 10 and the electrode case 22 having an electrode function are in close contact. As a result, it is possible to stably supply current to, for example, the object to be measured 10 using the electrode case 22, and it is also possible to accurately and stably measure the potential difference between the two electrodes. After measuring the signal in this manner, when the conductive fluid 23 is supplied from the outside by a pump or the like, the movable body 26 moves forward and returns to the position shown in FIG. 2A, and is set to the next measurement preparation state. I can do it.

Therefore, according to the configuration of the embodiment as described above,
Since the conductive fluid 23 is made to flow out to the electrode contact part using the flow part 24 inside the electrode case 22, the contact resistance can be measured with stable contact resistance even if the surface part of the object 10 to be measured is painted or otherwise corroded. The electrode case 22 can be brought into contact with the surface of the object, and thus a desired signal can be measured without the operator having to particularly clean the object 10 to be measured. Also, the second
If a predetermined number of electrodes as shown in the figure are arranged at predetermined intervals as shown in Fig. 1 and placed on an automatic traveling trolley, each electrode can be easily placed on the desired measurement area by remote control. This greatly contributes to simplifying and increasing the efficiency of work.
Moreover, work costs can be significantly reduced.

In the above embodiment, the movable body 26 is made into a sphere, but if either or both of the tip of the electrode case 22 and the curved receiving part 25 have a square shape, the corresponding side may be changed accordingly. A block body with a square shape may also be used. Further, various conventionally known methods can be used for moving means such as a base. In addition, the present invention can be modified and implemented in various ways without departing from the gist thereof.

[Effect of idea]

As described in detail above, according to the present invention, even if the surface of the object to be measured is bad, it is possible to bring the electrode into contact with the surface of the object to be measured in a stable contact state without requiring cleaning by an operator. It is possible to easily install the electrode on the surface of the object to be measured by operation, and it is possible to provide a signal measurement electrode that allows signal measurement work to be performed easily and at low cost.

[Brief explanation of the drawing]

Figures 1 and 2 are shown to explain one embodiment of the signal measurement electrode according to the present invention, and Figure 1 is a relationship diagram between the object to be measured and the electrode, and Figure 2 is a diagram of the relationship between the object to be measured and the electrode.
(A) is a state diagram inside the electrode when not measuring, and (B) is the same diagram.
is a state diagram inside the electrode during measurement. 10...Measurement target (pipe body), 11...Welded part,
20, 20a, 20b...electrode, 21...opening, 22...electrode case, 24...channel, 25...
... Curved receiving part, 26 ... Movable body, 27 ... Needle body,
28... Hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an electrode that measures a desired signal by contacting the surface of a conductive object to be measured, a cylindrical electrode case with an opening at the tip and the inside of this electrode case A predetermined flow path is formed in the flow path, and a conductive fluid is filled in the flow path, and a needle body is installed inside the tip of the electrode case and protrudes from the opening of the electrode case so as to move forward and backward. A movable body having a hole formed therein, and a needle body of the movable body is pressed against the surface of the object to be measured to cause the fluid to flow out to the surface of the object to be measured. electrode for signal measurement. (2) The signal measurement electrode according to claim 1, wherein the electrode case serves as a signal extraction electrode. (3) The signal measuring electrode according to claim 1, wherein the movable body is a spherical body provided with a hole through which the conductive fluid flows. (4) The signal measurement electrode according to claim 1, wherein the movable body is a rectangular block body provided with a hole through which the conductive fluid flows.