JPS63173953A - Checking of continuity for probe and probe with continuity checking function - Google Patents

Abstract

PURPOSE:To detect the presence of a disconnection simply, by arranging a lead for checking continuity between a reference pole side lead and a measuring side electrode for a concentration battery to make a component measuring circuit as a closed circuit with the short-circuiting of both. CONSTITUTION:An oxygen concentration battery 1 has a solid electrolyte 5 filled with a reference pole substance 3 and a filler 4 and a thermocouple 8 sealed into a U-shaped pipe 7 is arranged. The oxygen concentration battery 1 and the thermocouple 8 are mounted in a housing 10 through a refractory material 9 and a measuring side electrode 11 is fitted into the tip of a housing 10. Then, a connector 14 is fitted into a heat resistant protective tube B, to which B is connected an insert A to form a probe. A lead 16 for checking continuity which comprises a low-melting point metal fine wire with a fuse section formed at a part thereof is imbedded into the refractory material 9 to be connected to a reference pole side lead 2 and the measuring side electrode 11. A component measuring circuit in the probe forms a closed circuit with the lead 16 for checking continuity; thus, the presence of a poor continuity point can be learned by inspecting the continuity of this circuit.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a probe using a concentration battery used for measuring various components contained in metals at metal smelting sites, in which the internal wiring is The present invention relates to a method for confirming whether or not there is normal continuity, and a probe with a continuity confirmation function that specifically implements the method.

[Conventional technology]

For example, it is extremely important to measure the components of molten steel in a converter at a steel smelting site during blowing in order to obtain high-quality products. Conventionally, one of the methods for measuring these components is to construct a probe with a concentration battery such as an oxygen concentration battery or a sulfur concentration battery attached to the tip, and connect this probe to a holder and immerse it in molten steel to detect oxygen in the molten steel. The concentration and sulfur concentration are detected, and based on these values, the content ratio of other elements such as phosphorus and manganese is estimated.

[Problem that the invention seeks to solve]

However, when attaching the probe to the holder, slag or the like may adhere to the contact portion, which often causes poor contact and makes measurement impossible. In addition, since the probe is long and has a complicated component structure, internal wiring may occasionally break due to impact during transportation. By the way, in converter operation, temperature and components are measured during blowing, and dynamic control is performed based on this data to control operating conditions so that the components and temperature at the end of blowing are at target values.

Therefore, if the measurement during blowing fails due to the above reasons, it is necessary to reinstall the probe and take the measurement again, but in this case, the situation inside the furnace will change even before the remeasurement. It becomes difficult to accurately perform end point control based on the obtained data. Therefore, in order to accurately control the end point, it is desirable to check the continuity of the wiring inside the probe before immersion, but since the component measuring circuit consisting of a concentration battery is an open circuit before immersion in molten steel,
Unlike temperature measuring circuits made of thermocouples, continuity tests cannot be performed, and the presence or absence of disconnection cannot be confirmed before immersion.

[Means for solving problems]

The present invention has been made in view of the current situation, and a continuity check lead made of a low melting point metal is placed between the standard electrode side lead and the measurement side electrode of the concentration battery to short-circuit the two, thereby closing the component measuring circuit. By doing so, the presence or absence of a disconnection in the wiring of the component measuring circuit is detected by inspecting the continuity of the circuit. After inserting it into a substance to be measured such as molten steel, the conductivity confirmation lead is fused by the heat of the substance to be measured, thereby eliminating the short circuit between the two and allowing component measurements to be performed as before. Furthermore, we aim to provide a probe suitable for this purpose, the gist of which is to provide a probe having a concentration battery using a solid electrolyte installed in a housing via a refractory material at the tip. A continuity check lead made of a low melting point metal that electrically shorts the standard electrode side lead and the measurement side electrode is disposed within or outside the refractory material at a suitable location, and at least the entire length of the continuity check lead is One part of this is that the probe with a continuity check function is constructed by disposing the probe at a position where a portion of the probe is fused by the heat of the substance to be measured when inserted into the substance to be measured.

[For production]

According to such a method and device, the measurement circuit can be closed before being immersed in the substance to be measured, so that continuity between the standard electrode side lead and the measurement side electrode can be established when the probe is attached to the holder. By inspecting the component measurement circuit, it is possible to check whether there are any poor connections or disconnections in the component measurement circuit, and it is possible to prevent measurement errors caused by broken probes or poor contacts before immersion. be. This test can be performed by checking the continuity between the lead wires connected to the recorder at the base end of the holder, so existing connectors and holders can be used as is without the need for additional wiring. be.

Also, when the probe is inserted into the substance to be measured, the appropriate part of the continuity check lead is fused by the heat of the substance to be measured, and the short circuit between the standard electrode side lead and the measurement side electrode is eliminated, so the concentration battery is It functions normally and the components in the substance to be measured can be measured accurately as before.

〔Example〕

Next, details of the present invention will be explained based on illustrated embodiments.

What is shown in FIG. 1 is an embodiment of the probe with a continuity check function according to the present invention, and is a longitudinal cross-sectional view of the main part of the probe for measuring the oxygen concentration in molten steel. What is shown as A in the figure is an insert in which a concentration battery and a thermocouple are integrally attached. What is illustrated uses an oxygen concentration battery as the concentration battery, and the following explanation will also be made using an oxygen concentration battery, but it is also possible to use other concentration batteries such as a sulfur concentration battery. Furthermore, although the illustrated substance is molten steel, it is also possible to measure slag, gas, or even molten copper by appropriately changing the device configuration. In the figure, reference numeral 1 denotes an oxygen concentration battery, which has a conventionally well-known configuration in which a solid electrolyte 5 is filled with a standard electrode material 3 on the tip side and a filler 4 on the proximal side. A thermocouple wire 6 is connected to a U-shaped tube 7 at a side position of the oxygen concentration battery 1.
A thermocouple 8 which is sealed and formed is arranged.

The oxygen concentration battery 1 and the thermocouple 8 are mounted in a housing 10 via a refractory material 9 made of an inorganic insulator. Further, a ring-shaped measuring electrode 11 is fitted to the tip of the housing 10. A measurement-side electrode lead 12 is led out from the measurement-side electrode 11, and a standard electrode lead 2 is led out from the standard electrode material 3, and one end of each is electrically connected to a connector 14 at an appropriate position. As shown in FIG. 4, the insert A is connected to the heat-resistant protection tube B by fitting the connector 14 into the heat-resistant protection tube B, thereby forming a probe for measuring the components of molten steel. In addition, 15 in the figure is an iron cap.

The above is a conventionally well-known configuration, and the present invention is characterized by the presence of the continuity check lead shown as 16 in the figure. The continuity check lead 16 is, for example, a thin wire made of a low-melting point metal such as copper or aluminum, and is embedded in a refractory material 9 that is an electrical insulator, with one end connected to the standard electrode side lead 2 and the other end connected to the measurement side electrode. 11 to electrically short-circuit the standard electrode side lead 2 and the measurement side electrode 11.

The connection points of the continuity check lead 16 to the standard electrode side lead 2 and the measurement side electrode 11 are not limited to those shown in the figure, but
In order to ensure that the closed circuit formed through the continuity check lead 16 includes as wide a range of wiring within the probe as possible, it is preferable that the connection point be located as close to the optical end within the insert A as possible.

In addition, in the illustrated example, the connection with the measuring electrode 11 is made in an exposed state outside the refractory material 9, but this is to facilitate the assembly work, and the connection with the measuring electrode 11 is made from the inner wall 17 of the measuring electrode 11. It is also possible to connect, and further insert) A
It is also possible to connect to the measurement side electrode lead 12 on the base end side. If the continuity check lead 16 has a fusing part formed in a portion of its entire length, and if the fusing part is configured to be fused by the heat of the molten steel when the probe is immersed in molten steel, the arrangement position and the fusing part may be changed. Any aspect may be adopted. In the illustrated example, a fusing section 19 parallel to the distal end surface 18 is provided near the distal end surface 18 of the insert A, and when the probe is immersed in molten steel, the fusing section 19 is fused at multiple locations. I try to do that.

Further, in the illustrated example, a general thin copper wire with a circular cross section is used as the continuity check lead 16, but a tape-like wire with a square cross section as shown in FIG. 2 may also be optionally used. At this time, it is preferable to provide a notch 20.20 at a suitable location in the fusing portion 19 to facilitate fusing. Further, as another embodiment of the conduction checking lead 16, it is also possible to cover the fusing portion 19 with a synthetic resin 21 as shown in FIG. 3(A). In this way, when the probe is immersed in molten steel, the synthetic resin 21 will melt before the continuity confirmation lead is fused, and a space 22 will be formed around the fused part 19 as shown in FIG. 3(b). Therefore, even if the molten copper wire becomes a drop after that, it will hang downward, so it is possible to reliably avoid a situation where the molten copper wire comes into contact with each other.

In the illustrated example, all of the continuity check leads 16 are made of a low melting point metal, but only the fusing portion 19 may be made of a low melting point metal.

When using insert A with such a configuration, the fourth
As shown in the figure, it is fitted into a heat-resistant protective tube B to form a probe, and the probe is then mounted on a holder C. A lead wire connected to the standard electrode side lead 2 and the measurement side electrode 11 is led out from the base end of the holder C, and a recorder is attached to the tip of the lead wire for use. In addition, the lead wire led out from the thermocouple 8 is omitted in the illustration for the sake of illustration.

The probe configured as described above is used by attaching it to the holder C for each measurement, but the component measuring circuit inside the probe is
Since it forms a closed circuit, if you check the continuity of this circuit at the proximal end of holder C when installing it, it will not only be possible to detect a break in the wiring inside the probe, but also a break in the holder C or even connector 1.
It is possible to know whether there are any poor conduction points in all parts of the tip end side of the recorder, such as poor contact in 4 parts.

If continuity is confirmed, the probe is immersed in molten steel, but at this time, the fused portion 1 of the continuity confirmation lead 16 is
9. The heat of the molten steel quickly and reliably melts the metal at the appropriate location.
The short-circuited state between the standard electrode side lead 2 and the measurement side electrode 11 is quickly resolved, and the electromotive force of the concentration battery can be measured with a recorder as before.

By the way, continuity tests can be performed by installing a dedicated continuity test circuit in the recording instrument and switching the component measurement circuit to the continuity test dedicated circuit during the continuity test, but it is necessary to continue monitoring the indicated value of the recording instrument. It can also be done by The measurement chart showing the change in the indicated value of the recorder D'0) at this time is compared with the measurement chart when using a conventional probe that does not have a continuity check lead, and is shown in Figures 5 (a) and (b). show. In the case of conventional probes, the measurement circuit is an open circuit both before and after the probe is attached, so a floating electromotive force is generated and the reading on the recorder is not constant, resulting in a negative potential in the measurement circuit. is given so that the value indicated on the recorder is forced to indicate a minus number V.

However, even though the indicated value is negative before and after installation, it momentarily increases by 5 when it is installed.
A pulse exceeding 0 mV was being generated. In contrast, the probe with continuity function according to the present invention has an open circuit before being attached, but after being attached, a closed circuit is formed via the continuity confirmation lead 16, as shown in FIG. 5(A). Before installation, it shows a negative number ■ as before, but
After installation, it only shows OmV, and in the process of change, it shows +5
No pulses exceeding 0 mV are generated.

In recent years, there has been a tendency for electromotive force data obtained by measurement circuits to be directly processed by computers, and in this case, the data reading timing is set to start when the electromotive force exceeds a certain value. The value is often set to about 50 mV.

As mentioned above, conventional probes momentarily generate pulses that exceed this value, which can lead to computer malfunctions, but the present invention has also made it possible to solve this problem. Also, FIG. 6 (a) is a graph comparing the measurement chart of the probe according to the present invention before and after immersing it in molten steel with the measurement chart of the conventional probe.
, (b). FIG. 6(B) is a measurement chart of the conventional probe, which shows about a minus number of V before immersion. On the other hand, in the probe with a continuity check function according to the present invention, as shown in FIG. 6(a), the standard electrode side lead 2 and the measurement side electrode 11 are short-circuited from before to immediately after immersion, so that OmV is After that, the continuity checking lead 16 is immediately fused and the short-circuit condition is eliminated, and the voltage drops to about minus several volts. From then on, a measurement chart similar to that of a conventional probe will be shown. In this way, it was confirmed that the presence of the continuity check lead did not affect the measurement results.

As described above, in the continuity confirmation probe according to the present invention, the standard electrode side lead 2 and the measurement side electrode 11 are electrically short-circuited by the m continuity confirmation lead 16, so that when the probe is attached to the holder C. By checking the continuity between the lead wires connected to the recorder, the entire component measuring circuit, including not only the probe but also the holder, can be inspected for poor contact and disconnection. In addition, the lead 16 for continuity check
is formed of a low melting point metal such as copper, and has a part located near the tip surface 18 of the insert A,
Since the fusing part 19 is arranged parallel to the molten steel, when the probe is immersed in the molten steel, the heat of the molten steel is transferred to the fusing part 19, and multiple places in the fusing part 19 are quickly fused. The short-circuit condition will be eliminated, and no error will be caused in the measurement of the components in the molten steel by the oxygen concentration battery 1.

In addition, the standard electrode side lead 2 of the oxygen concentration battery 1 and the measurement side electrode 1
1 is short-circuited before being immersed, so no pulse is generated when it is attached to the holder (and it is also possible to prevent computer malfunctions).

The above explanation was about measuring the oxygen concentration in self-molten steel in a converter at a steel smelting site, but it goes without saying that it can also be used at other metal smelting sites by changing the configuration of the probe appropriately. .

〔Effect of the invention〕

The method of confirming continuity of the probe according to the present invention is to electrically short-circuit the standard electrode side lead and the measurement electrode side of the concentration battery with a conductive 11fl confirmation lead made of a low melting point metal, and then before inserting it into the substance to be measured. Since the measurement circuit was made into a closed circuit,
Since the probe is an open circuit, it is now possible to inspect for poor continuity in the component measurement circuit of the probe, which was previously impossible before the probe was inserted into the substance being measured. It is possible to detect the presence or absence of
It is possible to prevent measurement failures at metal smelting sites due to these causes. Furthermore, since the configuration short-circuits the standard electrode side lead and the measurement side electrode, there is no need to increase the number of lead wires led out from the probe, and therefore there is no need to change the connector or holder to which the probe is attached. Since there is no equipment, it is possible to use conventional equipment. To eliminate the short circuit between the standard electrode lead and the measurement electrode when inserting it into the substance to be measured,
Since the continuity check lead is fused and cut by the heat of the substance to be measured, there is no need for special equipment or operations to resolve the short-circuit condition, and the probe continuity test can be performed without increasing complicated work. It is something that can be done.

In addition, when manufacturing a probe with a continuity check function for carrying out such a method, it is only necessary to place a continuity check lead between the standard electrode side lead and the measurement side electrode, so it is not necessary to manufacture a conventional probe. The process can be followed as is, and a useful probe can be provided without increasing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a main part of an embodiment of the probe with a continuity check function according to the present invention, FIGS. 2 and 3 are explanatory views showing other aspects of the continuity check lead, and FIG. 4 is an explanatory diagram showing a method for checking continuity of a probe using a probe with a continuity check function, FIG. B) is a measurement chart when a conventional probe is attached to a holder, and FIG. (b) is a measurement chart obtained by measuring oxygen concentration using a conventional probe. A: insert, B: heat-resistant protection tube, C: holder,
D=Recorder, 1: Oxygen concentration battery, 2: Standard electrode side lead, 3: Standard electrode material, 4: Filler, 5: Solid electrolyte, 6: Thermocouple wire, 7: U-shaped tube,
8: Thermocouple, 9: Fireproof material, 10: Housing, 11: Measuring side electrode, 12: Measuring side electrode lead, 14: Connector, 15 Niallium cap, 16: Continuity check lead, 17: Inner wall, 18: Tip Face, 19:
Fused part, 20: Notch part, 21: Synthetic resin, 2
2: Space. Patent applicant: Nippon Steel Corporation No. (A) Figure 5 Figure 6

Claims (1)

[Claims] 1) In a probe having a concentration battery at the tip, a continuity check lead made of a low melting point metal is arranged between the standard electrode side lead and the measurement side electrode, and the two are electrically shorted. A closed circuit is formed between the two, and when the probe is attached to the holder, a continuity test is performed on the closed circuit to check for any disconnection or poor contact in the circuit. A method for confirming continuity of a probe, in which a part of the continuity confirmation lead is fused by the heat of the substance to be measured when inserted into the probe, thereby eliminating the short circuit between the standard electrode side lead and the measurement side electrode. 2) In a probe in which a concentration battery is installed in the housing near the tip via a refractory material, there is a metal with a low melting point that electrically shorts the standard electrode side lead and the measurement side electrode at a suitable place inside or outside the refractory material. A continuity check lead is provided, and at least a portion of the entire length of the continuity check lead is placed at a position where part of the lead is fused by the heat of the test substance when inserted into the test substance. Probe with confirmation function. 3) The probe with a continuity check function according to claim 2, which uses a tape-shaped lead as the continuity check lead. 4) A probe with a continuity check function according to claim 2, wherein a part of the lead for continuity check is coated with a synthetic resin.