JP5104244B2 - Molten metal immersion probe - Google Patents

Description

  The present invention relates to a molten metal immersion probe that is immersed in molten metal and measures various characteristics of the molten metal at a sensor portion at the tip.

  As this type of molten metal immersion probe, conventionally, a sensor portion is provided at the distal end of a cylindrical body constituting the probe, and a lead wire extending from the sensor portion is disposed on the proximal end side through a gap in the cylindrical body, It is electrically connected to a lead wire in a metal holder on the base end side to which the probe is attached, and is connected to each instrument in the operation room from an external cable or wirelessly transmitted. The opening at the front end of the cylindrical main body is sealed with a sealing material such as refractory cement, leaving the sensor portion, so that molten metal does not enter inside (for example, Patent Documents 1 and 2). reference.).

  The probe is automatically attached to the metal holder before the molten metal is immersed. At this time, the sealing material may be cracked or damaged by gripping the tip of the probe with the chuck. There is a risk that molten metal may enter the inside, leading to breakage of the lead wire, etc., and further, the molten metal that has entered may reach the sampling chamber and solidify in a gathered state, and the collected sample may not be removed from the measurement chamber There is also.

JP 2000-214127 A JP 2000-28438 A

  Therefore, in view of the above-described situation, the present invention intends to solve the problem of preventing the molten metal from entering even if the sealing material is cracked or broken during the automatic mounting of the probe, and disconnecting the sensor signal. And a molten metal immersion probe that can contribute to good sampling.

  In order to solve the above-mentioned problems, the present invention provides a molten metal comprising a sensor portion at the distal end of a cylindrical body, and a lead wire extending from the sensor portion is disposed on the proximal end side through a gap in the cylindrical body. In the immersion probe, a partition member that closes the opening is fitted at a position where the gap in the cylindrical main body opens on the probe front end side, and the cylindrical main body opening on the front end side of the partition member is inserted into the sensor unit. A molten metal immersion probe characterized by being sealed with a sealing material except for the above was constructed.

  Here, the partition member is preferably made of paper.

  Further, inside the outer tube constituting the cylindrical main body, a single or a plurality of inner pipes are housed, and between any of the members consisting of the outer tube and the single or a plurality of inner tubes It is preferable to provide a gap for arranging the lead wires.

  In this case, it is preferable that the partition member is composed of an annular member, a substantially C-shaped member in cross-sectional view provided with slits in the axial direction, or a plurality of half-divided divided members.

  Furthermore, it is preferable that the partition member is fitted in the inner surface of the outer inner tube or the outer tube in a state where the partition member is in contact with the distal end side of the inner tube forming the gap.

  Further, the partition member is set to a size that is sandwiched between the outer peripheral surface of the support tube that supports the sensor unit and the inner surface of the outer inner tube or the outer tube, and between the support tube and the cylindrical body. Is preferably occluded.

  The molten metal immersion probe according to the present invention as described above is sealed because the partition member is fitted and closed at the opening position of the gap where the lead wire of the sensor is wired, and the sealing material is sealed thereon. Even if a crack or breakage occurs in the material, the partition member can reliably prevent the molten metal from entering the gap, and the molten metal can be prevented from being broken in the lead wire or from the collecting chamber.

  In addition, since the partition member is made of paper, even if molten metal enters from cracks or broken parts of the sealing material, it is hard to burn and is elastic, and the opening of the gap is securely sealed to the molten metal gap. Can be prevented more reliably.

  In addition, a single or a plurality of inner pipes are provided inside the outer tube constituting the cylindrical main body, and the lead is provided between any of the members formed by the outer tube and the single or a plurality of inner tubes. Since the gap for arranging the wires is provided, the lead wires can be reliably protected from heat between the cylinders, the gap can be minimized, and the intrusion of the molten metal into the gap can be reliably prevented by the partition member.

  In addition, since the partition member is composed of an annular member, a substantially C-shaped member with a slit in the axial direction, or a plurality of half-divided members, it is possible to completely prevent the molten metal from entering the gap. In particular, in the case where a slit is provided or a member constituted by a divided member, the wiring of the lead wire can be performed after the partition member is installed, and the degree of freedom in workability is improved.

  In addition, since the partition member is fitted into the inner surface of the outer inner tube or the outer tube while being in contact with the distal end side of the inner tube that forms the gap, the partition member can be firmly held and Intrusion of molten metal can be reliably prevented.

  Further, the partition member is set to a size that is sandwiched between the outer peripheral surface of the support tube that supports the sensor unit and the inner surface of the outer inner tube or the outer tube, and the space between the support tube and the cylindrical main body is set. Since it is closed, the partition member can be firmly held, and the intrusion of the molten metal from the gap or the slit groove of the inner tube can be more reliably prevented.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing an overall schematic configuration of a molten metal immersion probe according to the present invention, in which FIGS. 1 to 4 show typical embodiments, in which reference numeral 1 denotes a partition member, 2 denotes a cylindrical body, 3 Denotes a sensor portion, 4 denotes a central shaft tube, 5 denotes an outer tube, 6 denotes a first inner tube, and 7 denotes a second inner tube.

  In the molten metal immersion probe P of the present invention, as shown in FIG. 1, a sensor part 3 supported by a support cylinder 31 protrudes from the distal end side of a cylindrical body 2, and a lead wire 30 extending from the sensor part 3 is provided. The partition member 1 is disposed on the proximal end side through the gap s in the cylindrical main body 2. In particular, the partition member 1 that closes the opening 22 on the probe distal end side of the gap s is provided, and the tip of the partition member 1 is provided. By sealing the periphery of the sensor portion 3 of the cylindrical body opening 20 on the side with the sealing material 21, even if the sealing material 21 is cracked or damaged, the partition member 1 enters the gap s of the molten metal. It is possible to prevent the lead wire 30 in the gap s from breaking and the molten metal that has entered through the gap s from being collected in the sampling chamber 9 inside.

  The cylindrical main body 2 has a structure in which a first inner tube 6, a second inner tube 7, and a third inner tube 8 are coaxially arranged in this order inside the outer tube 5. The end side protrudes from the inner tube 7, and the central shaft tube 4 is inserted into the protruding portion. The inner tube 7 supports the support cylinder 31 of the sensor unit 3 via the inner tube 8 on the distal end side, and also supports a collection container 90 and a taking-in unit 92 described later at the center position. A gap s is formed between the inner peripheral surface 60 of the inner tube 6 and the outer peripheral surface 71 of the inner tube 7, and the lead wire extends in the axial direction from the sensor portion 3 on the distal end side to the connector 40 on the proximal end side. It is used as a passage for arranging 30. Further, the distal end side of the inner tube 6 protrudes from the inner tube 7 and the inner tube 8, and the opening 22 of the gap s is formed by inserting the partition member 1 between the protruding portion and the support tube 31. The molten metal is prevented from entering the gap s.

  In this example, three inner tubes 6, 7, 8 are provided inside the outer tube 5, but one, two, or four or more inner tubes may be provided. In that case, a gap (passage) for arranging the lead wire can be provided between any of the pipes including the outer pipe 5 so as to contact the inner peripheral surface of the outer pipe forming the gap. It is also possible to close the gap if a partition member is provided. The outer tube 5 and the inner tubes 6, 7, and 8 are all made of paper that does not easily burn as in the conventional case.

  In this example, the sensor unit 3 is configured such that a support cylinder 31 is attached to the distal end portion of the inner tube 7 via the inner tube 8, and a temperature sensor 36 is mounted in a protruding state at the distal end opening. The thermocouple 32 with an arch-shaped quartz protective tube is disposed in the interior covered with the iron cover member 33, and has a temperature measuring section having a temperature measuring contact of the thermocouple near the apex thereof. The temperature measurement value measured by the thermocouple 32 is used as a means for measuring the temperature change of the molten metal in real time. In addition to providing such a temperature sensor 36 as the sensor unit 3, various sensors such as an oxygen sensor may be provided instead of or in combination. It is also possible to add a sampler to the sensor unit 3. Further, the lead wires 30 extending from the sensor unit 3 may be a single lead wire or a plurality of lead wires 30.

  Further, in this example, a collection container 90 constituting the molten metal collection chamber 9 is provided inside the cylindrical main body 2, specifically, on the inner surface side of the second inner tube 7, and is located at the opening position of the collection container 90. Is provided with a molten metal take-in portion 92 that communicates with the outside through an inlet 91 provided in the cylindrical body 2, and is made of titanium from the collection chamber 9 in the collection container 9 to the take-in portion 92. An acid material 94 is inserted. And the molten metal which flowed in from the inflow port 91 is poured into the collection chamber 9 in the collection container 90 from the said intake part 92, and after deoxidizing and solidifying, it is taken out as a sample and elemental analysis is carried out. A paperboard 93 is interposed between the bottom of the collection container 90 and the support cylinder 31 that supports the sensor unit 3 so that heat from the collection container 90 is not transmitted to the lead wire 30.

  A central shaft tube 4 is fitted and joined to the proximal end side of the cylindrical main body 2, and the central shaft tube 4 is provided with a connector 40 to which a lead wire 30 led out from the sensor unit 3 is connected. A signal from each sensor is transmitted to the outside by connecting to the electrical contact of the sub sleeve.

  As for the wiring structure of the lead wire 30 of the sensor unit 3, first, the lead wire 30 is wired in the support tube 31 from the temperature measuring sensor 36 at the tip of the support tube 31, and as shown in FIGS. The space between the bottom 9 and the paperboard 93 is led out to the outer peripheral side through a lateral groove 31b formed on the base end surface of the support cylinder 31. The derived lead wire 30 is inserted into the gap s between the inner tube 7 and the inner tube 6 on the outer peripheral side thereof using slit grooves 83 and 73 formed in the inner tubes 8 and 7, respectively. After being guided to the side, the slit groove 74 on the proximal end side of the inner tube 7 is used to connect to the connector 40 of the central shaft tube 4 located on the inner peripheral side. Instead of the slit grooves 73, 74, 83 for guiding the lead wire 30 in and out, for example, radial through holes may be formed.

  The partition member 1 inserted between the projecting portion of the inner tube 6 and the support cylinder 31 is composed of an annular member made of paper (in this example, a flat cylindrical member), and the dimension thereof is at least an opening of the gap s. In this example, the outer periphery of the support cylinder 31 is set in a state where the proximal end surface 11 is in contact with the distal end portions 7a and 8a of the inner inner tubes 7 and 8 forming the gap s. By setting the dimension to be sandwiched between the surface 35 and the inner peripheral surface 60 of the outer first inner pipe 6, the gap between the support cylinder 31 and the first inner pipe 6 is closed. In addition to the opening 22, the slit grooves 73 and 83 are also sealed with the partition member 1 so that the molten metal can be prevented from entering between the inner tubes 7 and 8.

  The partition member 1 is dimensioned so that at least the opening 22 of the gap s is closed and the inner peripheral surface has a gap between the support cylinders 31 and a refractory cement described later is embedded in the vacant inner space. May be. In addition, zero clearance is originally ideal, but it is needless to say that the clearance is sufficient to prevent the intrusion of molten metal. In addition to the annular member as in this example, the partition member 1 is formed of a substantially C-shaped member with a slit 10 in the axial direction as shown in FIG. May be sealed with refractory cement or the like, or may be configured by combining a plurality of half-divided members 1A and 1B as shown in FIG. Thus, by providing the slit 10 or configuring the divided members 1A and 1B, the lead wire 30 can be wired in the gap s after the partition member 1 is mounted, and the workability of the wiring is improved.

  After the partition member 1 is inserted and attached, the tip end side is sealed with a sealing material 21 so that the molten metal does not enter the cylindrical main body 2. This sealing material 21 is inexpensive and heat-resistant, such as refractory mortar, ceramics, and shell mold made of foundry sand, and can be molded in various ways. A member with less is used. Further, in this example, after sealing with the sealing material 21, a paper tube 34 having an outer diameter that is substantially the same as or slightly larger than the outer diameter of the cylindrical main body 2 extends at the tip side so as to surround the sensor unit 3. It is devised to prevent the chuck force from concentrating on the sealing material 21 by gripping the outer peripheral surface of the paper tube 34 together during automatic mounting, and to prevent cracks or breakage. .

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

1 is a longitudinal sectional view showing a molten metal immersion probe according to a representative embodiment of the present invention. The longitudinal cross-sectional view which shows the principal part of a molten metal immersion probe similarly. The partially broken disassembled perspective view which similarly shows the principal part. (A), (b) is a perspective view which shows the modification of a partition member.

Explanation of symbols

P Molten metal immersion probe s Gap 1 Partition member 2 Cylindrical body 3 Sensor part 4 Middle shaft pipe 5 Outer pipe 6 First inner pipe 7 Second inner pipe 7a Tip part 8 Third inner pipe 8a Tip part 9 Collection chamber DESCRIPTION OF SYMBOLS 10 Slit 11 Base end surface 20 Opening part 21 Sealing material 22 Opening part 30 Lead wire 31 Support cylinder 31b Horizontal groove 32 Thermocouple 33 Cover member 34 Paper tube 35 Outer surface 36 Temperature sensor 40 Connector 60 Inner surface 71 Outer surface 73, 74 Slit Groove 83 Slit Groove 90 Sampling Container 91 Inlet 92 Intake Portion 93 Paperboard 94 Deoxidizer

Claims (6)

  A molten metal immersion probe comprising a sensor portion at a distal end of a cylindrical main body and a lead wire extending from the sensor portion disposed on a proximal end side through a gap in the cylindrical main body, A partition member that closes the opening is fitted at a position where the gap opens on the probe tip side, and the cylindrical main body opening on the tip side of the partition member is sealed with a sealing material except for the sensor portion. Molten metal immersion probe characterized by.   The molten metal immersion probe according to claim 1, wherein the partition member is made of paper.   A single or a plurality of inner pipes are housed inside the outer tube constituting the cylindrical main body, and the lead wire is between any of the members composed of the outer tube and the single or a plurality of inner tubes. The molten metal immersion probe according to any one of claims 1 and 2, wherein a gap for disposing the metal is provided.   The molten metal immersion probe according to claim 3, wherein the partition member is configured by an annular member, a substantially C-shaped member having a slit in the axial direction, or a plurality of half-divided members.   The molten metal immersion according to claim 3 or 4, wherein the partition member is fitted into an inner surface of an outer inner tube or an outer tube in a state where the partition member is in contact with a distal end side of the inner inner tube forming the gap. probe.   The partition member is set to a size that is sandwiched between the outer peripheral surface of the support tube that supports the sensor unit and the inner surface of the outer inner tube or the outer tube, and the space between the support tube and the cylindrical body is closed. The molten metal immersion probe according to claim 5.

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