JP6270284B2 - Temperature measuring probe - Google Patents

Description

  The present invention relates to a temperature measuring probe for measuring the temperature of a molten metal.

  In steelmaking plants, molten steel (molten steel) is processed into steel plates and steel bars with a continuous casting machine as the final process of refining. In the continuous casting method, molten steel in the ladle is collected in a tundish and poured into a continuous casting machine. For this reason, the temperature of molten steel in tundish not only affects product quality, but also affects the operating conditions of the casting machine. That is, the temperature of the molten steel is measured in order to determine the operating conditions. For the measurement of the molten steel temperature, for example, a temperature measuring probe described in Patent Document 1 is used.

  The temperature measuring probe described in Patent Document 1 has a thermocouple, a heat-resistant tube (inner protection tube) that houses the thermocouple, and a sleeve (outer protection tube) that houses the heat-resistant tube. Further, the sleeve is fixed to the flange and the support member by a mounting bracket. This temperature measuring probe measures temperature by immersing the tip in molten metal.

  A conventional temperature measuring probe is inserted into a hole opened in a container (a ladle or a tundish) in which the molten metal is stored, and the tip is immersed in the molten metal. At this time, the mounting bracket for fixing the sleeve is exposed in the container. The metal mounting bracket exposed in the container was exposed to high heat from the molten metal, and there was a risk of oxidation and melting. When oxidation or melting occurs in the mounting bracket, the shape of the mounting bracket itself cannot be maintained due to deterioration, and the ability to hold the sleeve decreases. When the mounting bracket cannot hold the sleeve, there is a problem that the metal fitting falls into the molten metal.

  Further, when the tip of the temperature measuring probe is immersed in the molten metal for temperature measurement, a force due to the flow rate of the molten metal itself is applied to the distal end portion of the temperature measuring probe. The force applied to the tip is applied in the direction in which the sleeve bends. The sleeve to which force is applied tends to be deformed along the direction in which the force is applied, but the proximal end is fixed by a mounting bracket. As a result, the force applied to the sleeve concentrates on the portion where the sleeve is fixed to the mounting bracket (contact point of the sleeve with the mounting bracket). There is a large difference in strength between the metal that forms the mounting bracket and the ceramic that forms the sleeve, and the partially concentrated force concentrates more on the sleeve side. There is a problem that this force causes damage to the temperature measuring probe such as breakage of the sleeve.

  In the conventional temperature measuring probe 1 whose structure is shown in FIG. 9, when a force is applied to the tip thereof, the contact with the mounting bracket 9 of the sleeve 4 and the contact with the mounting bracket 9 of the heat-resistant tube 3 are similarly applied. There was a problem that the force concentrated and became the starting point of damage. Note that FIG. 9 is the same as the embodiment described later for configurations (reference numerals) that are not particularly mentioned. Moreover, the member shown by the code | symbol 90 in FIG. 9 is a heat-resistant board which consists of heat insulating materials, such as ceramics for suppressing the thermal damage of the flange 5. As shown in FIG.

  Further, when a force due to the flow of the molten metal is applied to the sleeve, there is a problem that the load is concentrated on the fixing portion where the heat-resistant pipe is fixed to the sleeve, and the heat-resistant pipe falls off.

  In other words, the conventional temperature measuring probe has a problem that it easily breaks due to load concentration caused by the flow of the molten metal or deteriorates the mounting bracket when measuring the temperature of the molten metal.

JP 2001-304978 A

  This invention is made | formed in view of the said actual condition, and makes it a subject to provide the temperature measurement probe by which damage was suppressed.

  In order to solve the above problems, as a result of repeated studies on the structure of the temperature measuring probe, the present invention has been achieved.

The temperature measuring probe of the present invention is a temperature measuring probe for measuring the temperature of the molten metal by immersing the tip in the molten metal, and contains the temperature measuring means for measuring the temperature at the tip of the temperature measuring probe and the temperature measuring means. An internal protective tube whose tip is closed and a flange for positioning the temperature measuring probe, the internal protective tube has a recess recessed from its outer peripheral surface, and the distal end of the flange is inserted into the recess Thus, the locking projection for supporting the inner protective tube is fixed, and the inner protective tube has its tip portion allowed to be displaced in at least one of the axial direction, the radial direction, and the circumferential direction. It is supported by a flange.

  The temperature measuring probe of the present invention has a configuration in which the displacement of the inner protective tube is allowed. For this reason, even if force is applied to the internal protective tube, the internal protective tube is displaced, so that stress is not concentrated on the internal protective tube. As a result, breakage of the internal protective tube is suppressed, and damage to the temperature measuring probe due to the internal protective tube is suppressed.

It is the figure which showed the structure of the temperature measuring probe of 1st embodiment. It is the figure which showed the structure of the temperature measuring probe of 1st embodiment. It is the figure which showed the fixation structure of the external protective tube of the temperature measuring probe of 1st embodiment. It is the figure which showed the structure which supports the internal protection tube of the temperature measuring probe of 1st embodiment. It is the figure which showed the structure which supports the internal protection tube of the temperature measuring probe of 1st embodiment. It is the figure which showed the structure of the temperature measuring probe of the example of 2nd embodiment. It is the figure which showed the support structure of the internal protection pipe | tube and external protection pipe | tube of the temperature measuring probe of a 2nd embodiment. It is the figure which showed the support structure of the internal protection pipe | tube and external protection pipe | tube of the temperature measuring probe of the 2nd modification of the example of 2nd embodiment. It is the figure which showed the structure of the conventional temperature measuring probe.

  The temperature measuring probe of the present invention is a temperature measuring probe for measuring the temperature of the molten metal by immersing the tip in the molten metal, and contains the temperature measuring means for measuring the temperature at the tip of the temperature measuring probe and the temperature measuring means. And an internal protective tube whose tip is closed, and a flange for positioning the temperature measuring probe.

  The temperature measuring means is a means for measuring the temperature at the tip of the temperature measuring probe. The temperature measuring means is not particularly limited as long as it can measure the temperature. The temperature measuring means can be a thermocouple.

  The thermocouple is a member that actually measures the temperature. In the present invention, a thermocouple that can be used for measuring the temperature in the temperature range of the molten metal is appropriately selected. Examples of the thermocouple include platinum rhodium type, tungsten rhenium type, iridium rhodium type, alumel chromel type, nickel molybdenum type, and nicrosyl type.

  In the temperature measuring probe of the present invention, a platinum rhodium type thermocouple is preferably used for measuring the temperature of the molten steel. The platinum rhodium type thermocouple is a thermocouple in which the + side of the thermocouple is a platinum rhodium alloy and the-side is a platinum rhodium alloy or platinum. The specific composition of the platinum rhodium-type thermocouple can be a conventionally known composition.

  The internal protective tube is a tube with a closed end that accommodates the temperature measuring means. Since the internal protective tube is configured to accommodate the temperature measuring means, the temperature measuring means can suppress the reaction with the reactive substance from the outside of the internal protective tube, and the effect of extending the life of the temperature measuring means can be obtained. The shape of the internal protective tube is not limited as long as it can protect the temperature measuring means, and a conventionally known shape can be applied.

  The material of the inner protective tube is not limited and can be a conventionally known material. As this material, a metal-ceramic composite (cermet) having hardness and temperature quick response required for the inner protective tube can be used.

  The internal protective tube may have another protective tube (for example, an insulating tube) disposed therein. The material forming the insulating tube may be any material that can prevent the reactive substance from the outside of the insulating tube from reacting with the temperature measuring means, and is preferably a material that does not contain carbon. Since the insulating tube is made of a material that does not contain carbon, it is possible to prevent carbon from entering from the outside of the insulating tube. Examples of the material for forming the insulating tube include alumina, magnesia, mullite, and the like, and alumina is more preferable.

  The flange is a member for positioning the temperature measuring probe. The flange is a member that is assembled to a tundish or the like when the temperature of the molten metal is measured with a temperature measuring probe. That is, the temperature measuring probe is fixed at a predetermined position via the flange.

The material of the flange is not limited, and a conventionally known material can be used. The material may be any material as long as it can position the external protective tube and is not easily affected by the surrounding high heat when measuring the temperature of the molten metal, and may be a heat-resistant metal. An example of the heat-resistant metal is stainless steel.
In the temperature measuring probe of the present invention, the inner protective tube is supported by the flange in a state in which the distal end portion thereof is allowed to be displaced in at least one of the axial direction, the radial direction, and the circumferential direction.

  In the temperature measurement probe of the present invention, the support in a state in which the displacement is allowed indicates that the inner protective tube can be displaced in each direction without losing the support from the flange. The permissible displacement in each direction includes not only the displacement of the tip in each of the axial direction, the radial direction, and the circumferential direction, but also a displacement in a direction combining these directions.

  In the temperature measuring probe of the present invention, even if a force from a molten metal or the like is applied to the temperature measuring probe, the internal protective tube is displaced, so that the force (load) applied to the temperature measuring probe is partially concentrated in the protective tube. It ’s gone. For this reason, the temperature measurement probe of the present invention can prevent breakage due to damage to the internal protective tube. That is, the temperature measuring probe of the present invention is one in which damage is suppressed.

  Furthermore, since the inner protective tube is supported in a swingable state, the inner protective tube does not restrict deformation (displacement) of the outer protective tube when the outer protective tube is bent or displaced. That is, in the temperature measuring probe of the present invention, the inner protective tube is prevented from damaging the outer protective tube, and as a result, the temperature measuring probe itself is prevented from being broken.

In the temperature measuring probe of the present invention, the method of supporting the inner protective tube in a swingable state is, for example , a form in which it is suspended in a swingable state on a member whose position is fixed with respect to the flange, And a method of supporting the member with a fixed position, a method of providing the enlarged diameter portion on the inner protective tube and supporting the enlarged diameter portion in a slidable state on the flange side, and the like.

  It is preferable that the base end portion of the inner protective tube is supported in a state where the distal end can swing. By supporting the inner protective tube at the base end portion, the amount of displacement on the distal end side can be increased (a larger displacement can be allowed), and as a result, damage to the inner protective tube can be suppressed.

  The inner protective tube is preferably supported at its proximal end with its distal end being swingable. However, the inner protective tube is supported so that its pivot point is located closer to the distal end than the proximal end. Also good. That is, it is preferable that the inner protective tube is supported so that the fulcrum of oscillation is located on the distal end side with respect to the base end portion.

In the temperature measuring probe of the present invention, the inner protective tube has a concave portion recessed from the outer peripheral surface thereof, and a locking projection that supports the inner protective tube is fixed to the flange by inserting the tip of the inner protective tube into the concave portion. Has been. In this embodiment, the tip of the locking projection inserted into the recess is in contact with the inner wall surface of the recess, thereby supporting the inner protective tube without joining. As a result, the swinging of the inner protective tube is not restricted.
The specific shapes of the recess and the locking projection are not limited except that the inner protective tube can be swingably supported.

  The locking projection protrudes with a length that can abut on the side wall surface (base side wall surface on the base end side) positioned relatively above the side wall surface of the recess. That is, the locking projection may be either in contact with or not in contact with the bottom surface (bottom surface extending in the axial direction) of the recess. Moreover, in order to suppress damage to the internal protective tube, it is preferable that the locking projection has an R shape with its tip rounded.

  Further, the number of the locking protrusions is not limited, but is preferably one or more, more preferably a plurality, and further preferably three or more. Here, when a plurality of locking protrusions are provided, it is preferable that they are provided at equal intervals in the circumferential direction (so that the positions in the circumferential direction form equal angles).

  The recess into which the distal end of the locking projection is inserted is also preferably formed in a shape that can be supported by contacting the distal end of the inserted locking projection with its side wall surface (base side wall surface). In other words, the concave portion has a cross-sectional shape perpendicular to the circumferential direction, which is a concave shape, U-shape, V-shape, L-shape (from the reduced diameter state to the expanded diameter state, and the tip side The shape without the side wall surface) may be formed. Furthermore, although the recessed part should just be provided in the position in which the latching protrusion is provided, the groove formed over the full length of the circumferential direction may be sufficient.

Furthermore, in the recess into which the distal end of the locking projection is inserted, the distance between the pair of side wall surfaces (the side wall surface on the base end side and the side wall surface on the front end side) excessively restricts the swing of the internal protective tube. It is possible to make it so that it does not occur (to the extent that a predetermined swing amount can be obtained). Here, if the distance between the pair of side surfaces is short, even if the inner protective tube swings, the side wall surface on the tip side immediately comes into contact with the locking projection, and further swinging is hindered. .
In the temperature measuring probe of the present invention, it is preferable that the recess is formed by a groove extending in the circumferential direction of the inner protective tube, and one or more locking protrusions are inserted into the recess.

  In the temperature measuring probe of the present invention, the specific configuration of the locking projection is not limited as long as it can support the inner protective tube so as to be able to swing.

  For example, a configuration using a connecting member provided with a base for joining to a flange or another member joined to the flange, and a support part formed integrally with the base and having a locking projection. it can.

  The base is a member for joining to a flange (or another member joined to the flange), and a plate-like member joined integrally to the flange can be exemplified. The joining to the flange may be any state as long as it is joined when the temperature measuring probe of the present invention is used. Even if it is formed integrally with the flange, it is detachably attached to the flange. Or either.

  The support portion is a member formed integrally with the base portion and having a locking projection, and has a standing portion standing on the proximal end side from the flange and a locking projection provided on the standing portion. It can be a member. The standing portion is not limited as long as it is a member that can have a locking projection, and is a plate-like or rod-like member standing from the base, or a cylinder in which an inner protective tube is arranged on the shaft center portion. Can be raised.

  The locking projection can be a member protruding in the direction of the inner protective tube from the standing portion. Even if the standing portion is formed in a partially convex shape, it can be locked to the standing portion. It may be formed by assembling the members to be the protrusions.

  In the temperature measuring probe of the present invention, the connecting member includes a plate-like base portion joined to the flange, and a cylindrical support portion that is formed integrally with the base portion and is erected from the base-end-side surface of the base portion. It is preferable that the engaging protrusion is formed of a rod-shaped member that penetrates the cylindrical support portion from the radially outer side in the axial direction.

  The rod-shaped member that forms the locking projection is preferably a bolt. By forming the locking projections with bolts, the positioning of the locking projections and the adjustment of the protruding amount can be easily performed. Here, the bolt indicates a member that can be joined and the amount of protrusion can be adjusted such that a rod-like outer circumferential surface is threaded, and can be assembled by screwing. Including components of construction.

  The temperature measuring probe of the present invention is not particularly limited with respect to the configuration (locking structure) of the external protective tube. That is, even if the position of the external protective tube relative to the flange is fixed, the external protective tube may be supported in a state in which the position of the external protective tube relative to the flange can be changed in the same manner as the internal protective tube.

  It is preferable that the position of the external protective tube with respect to the flange is fixed. By fixing the position of the external protective tube, the displacement of the external protective tube is suppressed, and the deformation (bending) of the temperature measuring probe is further suppressed. The method of fixing the position of the external protective tube with respect to the flange is not limited, and a method of directly fixing to the flange is preferable.

  The external protective tube is preferably supported by the flange in a swingable state. By supporting the outer protection tube in a swingable state like the inner protection tube, when the temperature measuring probe is about to deform (bend), the force applied by the swinging of both protection tubes is released. And damage to each of both protective tubes is suppressed. The method of supporting the outer protective tube on the flange in a swingable state is not limited, and it is preferable that a diameter-enlarged portion is formed on the outer protective tube, and the flange supports the expanded-diameter portion.

  When the external protective tube is supported by the flange in a swingable state, the external protective tube may be formed integrally with the internal protective tube or may be formed separately. When the external protective tube and the internal support tube are integrally formed, the external protective tube can protect the internal protective tube, and damage to the temperature measuring probe can be further suppressed. If the external protective tube and the internal support tube are formed separately, both protective tubes can swing differently, and each protective tube can be prevented from damaging another protective tube.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In addition, each following form is a specific example for implementing this invention, and this invention is not limited only to each following form.

[First embodiment]
This embodiment is a temperature measuring probe whose structure is shown in FIGS. FIG. 1 is a diagram showing a configuration of a temperature measuring probe 1 according to the present embodiment. FIG. 2 is a cross-sectional view showing a cross section taken along line II in FIG. FIG. 3 is an enlarged cross-sectional view showing a configuration in the vicinity of the enlarged diameter portion of the outer protective tube 4. FIG. 4 is a view showing a section taken along line II-II in FIG. 1, and is a view showing a locking structure of the inner protective tube 3 in a section perpendicular to the axial direction. In FIG. 4, the illustration of the thermocouple 2 disposed in the axial center is omitted. FIG. 5 is a diagram schematically showing a structure in which the internal protection tube 3 is supported by the support pins 8, and is a diagram showing a configuration taken along line III-III in FIG. 4. In addition, in FIG. 1, it showed so that the downward direction might become a front-end | tip (others are also the same).

  The temperature measuring probe 1 of this embodiment has a platinum rhodium type thermocouple 2 (corresponding to a temperature measuring means) having a temperature measuring portion at the tip, and a tip 3a (tip side) closed to accommodate the thermocouple 2. An inner protective tube 3 made of a cylindrical metal-ceramic composite (cermet), an outer protective tube 4 made of ceramics surrounding the inner protective tube 3, and a flange made of stainless steel that supports the outer protective tube 4 5 and a joining material 6 for joining the outer protective tube 4 and the flange.

  The thermocouple 2 is a platinum rhodium type thermocouple, and its temperature measuring part is assembled close to the inner surface of the tip part 3 a of the internal protective tube 3. The base end portion of the thermocouple 2 is connected to an indicator (not shown) via a probe head (terminal head) 25. As shown in FIG. 2, the thermocouple 2 is inserted into the through holes 22 and 22 of the insulating tube 21 having a pair of through holes 22 and 22 that run parallel to each other, and the temperature measuring part at the tip is an insulating tube. It is assembled in a state protruding from the end face of 21.

  The inner protective tube 3 is a cylindrical member whose tip is closed. In this embodiment, the distal end portion 3a is a cylindrical member having a circular cross section that has a smooth curved shape. The inner protective tube 3 is provided in a state where the thermocouple 2 is close to the inner surface except for the tip when the thermocouple 2 is accommodated therein. The inner protective tube 3 is housed inside the thermocouple 2 in a state of being housed in a state where the thermocouple 2 penetrates the insulating tube 21.

  The inner protective tube 3 is provided with a groove 30 having a concave cross section over the entire circumference in the vicinity of the end on the base end 3b side. The cross-sectional shape of the groove 30 indicates a shape in a cross section perpendicular to the direction in which the groove 30 extends.

  The outer protective tube 4 is a cylindrical member having a circular cross section with both ends opened. The outer protective tube 4 is provided so as to have a small gap between the inner peripheral surface of the inner protective tube 3 and the outer peripheral surface of the inner protective tube 3 when the inner protective tube 3 is accommodated therein.

The outer protective tube 4 includes a diameter-expanded portion 40 whose outer diameter is increased at the base end portion 4b. The enlarged diameter portion 40 is formed so that the proximal surface thereof forms the proximal surface of the external protective tube 4. The enlarged diameter portion 40 is formed such that the diameter gradually increases as it proceeds from the distal end 4a side to the proximal end 4b side. That is, the enlarged diameter portion 40 has an outer shape having a tapered substantially truncated cone shape.
The flange 5 includes a substantially disc-shaped main body portion 50 that extends in a direction perpendicular to the axial direction, and a substantially cylindrical standing portion 55 that stands on the surface of the base end side of the substantially disc-shaped main body portion 50.

  The main body portion 50 of the flange 5 has a substantially disk shape in which a through hole 51 is opened. The flange 5 is in contact with the end surface on the proximal end side of the outer protective tube 4 on the surface of the substantially disc-shaped distal end side. At this time, a through hole 51 is opened in the axial center portion of the substantially disc-shaped main body 50 of the flange 5 so that the internal protective tube 3 accommodated in the external protective tube 4 can pass through.

  The main body portion 50 of the flange 5 is formed such that the outer edge portion 500 protrudes in the front end side direction. That is, the main body portion 50 of the flange 5 has a substantially U-shaped outer shape with the base end side closed (cylindrical shape with the base end side closed) in the cross section along the axial direction. doing.

  The standing portion 55 of the flange 5 has a substantially cylindrical shape that is provided on the surface of the base end side of the main body portion 50. The standing portion 55 has a standing base portion 550 that extends along the surface on the base end side of the main body portion 50. In this embodiment, the standing base portion 550 is joined to the main body portion 50 by screws (not shown). The standing portion 55 may be joined by a joining method such as welding.

  The standing portion 55 supports the inner protective tube 3 in a swingable state in a state where the inner protective tube 3 is inserted into the substantially cylindrical shaft center portion. The internal protection tube 3 is supported by the standing portion 55 by inserting the tip of the support pin 8 penetrating the cylindrical standing portion 55 into the groove 30 of the internal protection tube 3.

  Specifically, as shown in FIG. 9, in the standing portion 55, the three support pins 8 pass through inward in the radial direction in a state where the inner protective tube 3 is inserted through the axial center portion. . The distal end of the support pin 8 that penetrates the cylindrical standing portion 55 is inserted into the groove 30 of the inner protective tube 3, contacts the side wall surface 3d on the proximal end 3b side of the groove 30, and is on the distal end 3a side. There is a gap with the side wall surface 3c. That is, the width of the opening of the groove 30 (the distance between the pair of side wall surfaces 3 c and 3 d) is formed wider than the thickness of the tip inserted into the groove 30 of the support pin 8.

The tip of the support pin 8 inserted into the groove 30 comes into contact with the bottom surface 3 e of the groove 30. In this embodiment, the support pin 8 is made of a bolt, and its tip is pressed against the bottom surface 3e of the groove 30 to apply a biasing force radially inward. In this embodiment, the support pin 8 is inserted into the groove 30 and the support pin 8 and the side wall surface 3d of the groove 30 are not in contact with each other (a state separated by a small interval). 3 is allowed to swing.
In this embodiment, the support pin 8 is formed of a bolt. However, any member other than a bolt may be used as long as the insertion amount into the groove 30 at the tip can be adjusted while penetrating the standing portion 55. May be.

  The joining material 6 joins both in a state in which the end surface on the proximal end side of the outer protective tube 4 is in close contact with the surface on the distal end side of the flange 5 (the end surface of the outer protective tube 4 is pressed against the flange 5). The bonding material 6 is disposed on the front surface side of the flange 5 in a state where the enlarged diameter portion 40 of the outer protective tube 4 and the stud 52 of the flange 5 are also disposed inside. In this embodiment, the bonding material 6 is formed by solidifying cement filled in the substantially U-shaped interior of the flange 5.

  The temperature measuring probe 1 of this embodiment is supported in a state in which the inner protective tube 3 can swing on the flange 5. Further, the external protective tube 4 is directly joined to the flange 5 without using a mounting bracket. That is, since the mounting bracket is not used as in the prior art, the mounting bracket is suppressed from becoming a starting point of damage of the temperature measuring probe 1.

  Further, the temperature measuring probe 1 of this embodiment is deformed when a force based on the flow of the molten metal is applied to the temperature measuring probe 1 (the external protective tube 4 and the internal protective tube 3) when measuring the temperature of the molten metal. However, since the mounting bracket does not restrict the deformation of the temperature measuring probe 1 (and the external protective tube 4) as in the conventional case, the temperature measuring probe 1 itself is prevented from being broken by the deformation. Further, the inner protective tube 3 is supported in a swingable state, and the inner protective tube 3 does not restrict the deformation of the outer protective tube 4. Also from this configuration, the temperature measuring probe 1 itself is prevented from being broken by deformation.

  In the temperature measuring probe 1 of this embodiment, the external protective tube 4 is closely attached to the flange 5 by being joined by the joining material 6 in a state where the external protective tube 4 is closely attached to the flange 5 (biased state). The relative position shift can be suppressed. That is, even when a force in a direction perpendicular to the axial direction (for example, radial direction) is applied to the temperature measuring probe 1 (external protective tube 4), the contact surface between the external protective tube 4 and the flange 5 does not shift.

  Further, in the temperature measuring probe 1 of the present embodiment, the surface on the proximal end side of the enlarged diameter portion 40 formed by expanding the diameter of the external protective tube 4 forms a contact surface with the flange 5. The enlarged diameter portion 40 has a larger outer shape than a portion where the enlarged diameter portion 40 is not formed. And the contact surface divided by the surface of the base end side of this enlarged diameter part 40 has a larger area than the case where the enlarged diameter part 40 is not formed. Then, the outer protective tube 4 and the flange 5 are in close contact with each other over this wide contact area. That is, in the temperature measuring probe 1 of the present embodiment, the contact area between the external protective tube 4 and the flange 5 is wide, and partial concentration of force (load) does not occur. As a result, the temperature measuring probe 1 of the present embodiment can suppress damage to the temperature measuring probe 1 and the external protective tube 4 due to partial concentration of force (load).

[Second Embodiment]
This embodiment is a temperature measuring probe whose structure is shown in FIGS. The temperature measuring probe 1 of this embodiment is a temperature measuring probe having the same configuration as that of the first embodiment except that the external protective tube 4 is locked in a swingable state (the locking structure is different). . FIG. 6 is a diagram showing a configuration of the temperature measuring probe 1 of the present embodiment. FIG. 7 is a diagram schematically showing a locking structure of the inner protective tube 3 and the outer protective tube 4. In the temperature measurement probe 1 of the present embodiment, the components that are not particularly referred to are the same as those in the first embodiment.

  The outer protective tube 4 is a cylindrical member having a circular cross section with both ends opened. The outer protective tube 4 is provided so as to have a small gap between the inner peripheral surface of the inner protective tube 3 and the outer peripheral surface of the inner protective tube 3 when the inner protective tube 3 is accommodated therein.

  The outer protective tube 4 includes a diameter-expanded portion 40 whose outer diameter is increased on the proximal end side. The diameter-enlarged portion 40 is formed such that the surface on the distal end side gradually increases in diameter as it proceeds from the distal end 4a side to the proximal end 4b side. That is, the enlarged diameter part 40 has a substantially frustoconical outer shape.

  The flange 5 includes a substantially disc-shaped main body portion 50 that extends in a direction perpendicular to the axial direction, and a substantially cylindrical cylindrical support portion 56 that stands on the surface of the front end side of the substantially disc-shaped main body portion 50. Further, the flange 5 has a heat-resistant plate 57 on the distal end side of the main body portion 50 to ensure the heat resistance of the flange 5.

  The cylindrical support portion 56 of the flange 5 has a substantially cylindrical shape that is provided upright on the front end surface of the main body portion 50. The cylindrical support portion 56 has a substantially conical inner peripheral surface that substantially matches the outer shape of the enlarged diameter portion 40. The term “substantially coincident with the outer shape of the enlarged diameter portion 40 on the inner peripheral surface of the cylindrical support portion 56” indicates a state in which there is a gap that allows a relative positional shift of the enlarged diameter portion 40.

  As for the cylindrical support part 56, the inner protective tube 3 and the outer protective tube 4 are inserted in the substantially cylindrical axial center part. At this time, the position of the inner protective tube 3 is fixed via the flange standing portion 55. Further, the distal end of the external protective tube 4 is inserted into the axial center of the cylindrical support portion 56 from the proximal end side toward the distal end side. The inserted external protective tube 4 is locked in a state where the outer peripheral surface of the enlarged diameter portion 40 and the inner peripheral surface of the cylindrical support portion 56 are in contact with each other.

  In this embodiment, the outer protective tube 4 is locked and supported by the flange portion 5 by the enlarged diameter portion 40 being caught by the cylindrical support portion 56. In addition, the heat insulating member 7 is disposed on the proximal end side of the enlarged diameter portion 40 in a state in which the outer protective tube 4 is inserted into the cylindrical support portion 56 of the flange 5, thereby ensuring heat insulation. This heat insulating member 7 is also arranged so as to be able to change following the enlarged diameter portion 40.

  The temperature measuring probe 1 according to the present embodiment holds the inner protective tube 3 and the outer protective tube 4 on the flange 5 without using a mounting bracket. That is, since the mounting bracket is not used as in the prior art, the mounting bracket is suppressed from becoming a starting point of damage of the temperature measuring probe 1.

  In addition, the temperature measuring probe 1 of the present embodiment is deformed when a force based on the flow of the molten metal is applied to the temperature measuring probe 1 (the inner protective tube 3 and the outer protective tube 4) when the temperature of the molten metal is measured. Even if it occurs, since the mounting bracket does not restrict the deformation of the temperature measuring probe 1 (the inner protective tube 3 and the outer protective tube 4) as in the conventional case, the temperature measuring probe 1 itself is prevented from being broken by the deformation. It has been.

  Further, in the temperature measuring probe 1 of the present embodiment example, the inner protective tube 3 and the outer protective tube 4 are only rockably locked to the flange 5, and the inner protective tube 3 and the outer protective tube 4 are connected to the flange 5. In this structure, a relative positional shift is allowed. As a result, even when a force based on the flow of the molten metal is applied to the temperature measuring probe 1 (the internal protective tube 3 and the external protective tube 4) when measuring the temperature of the molten metal, the internal protective tube 3 and the external protective tube 4 As a result, the force is not concentrated on the internal protective tube 3 and the external protective tube 4, and the internal protective tube 3 and the external protective tube 4 are prevented from being damaged.

  Further, in the temperature measuring probe 1 of the present embodiment example, the external protective tube 4 is formed in a state of being spaced apart from the internal protective tube 3, and each of the internal protective tube 3 and the external protective tube 4 is misaligned. Even if this occurs, since the mutual pipes 3 and 4 do not restrict the displacement of each other, it is possible to prevent the respective protective pipes 3 and 44 from being damaged.

(Modified form of the second embodiment)
In the first embodiment, the enlarged diameter portion 40 of the outer protective tube 4 and the cylindrical support portion 56 of the flange 5 are formed so as to form a substantially truncated cone shape. Can be given. The temperature measuring probe 1 of the present modification shown below has the same configuration as that of the second embodiment with respect to the configuration not particularly mentioned.

(Variation 1 of the second embodiment)
This form is the second except that the enlarged diameter portion 40 of the outer protective tube 4 has a substantially spherical shape and the inner peripheral surface of the cylindrical support portion 56 of the flange 5 substantially matches the outer shape of the enlarged diameter portion 40. The configuration is the same as that of the embodiment.

  Also in the temperature measuring probe 1 of this embodiment, the external protective tube 4 has a structure that allows a positional shift relative to the flange 5. That is, the same effect as the second embodiment is exhibited.

(Modification 2 of the second embodiment)
This embodiment has the same configuration as that of the second embodiment except that the distal end of the cylindrical support portion 56 of the flange 5 is slightly enlarged in diameter.

  Also in the temperature measuring probe 1 of this embodiment, the external protective tube 4 has a structure that allows a positional shift relative to the flange 5. That is, the same effect as the first embodiment is exhibited.

  Furthermore, in this embodiment, when the distal end of the cylindrical support portion 56 slightly expands in diameter, the outer protective tube 4 is displaced (particularly, when the distal end changes along the circumferential direction). The outer protective tube 4 is prevented from being scraped by the opening at the tip of the cylindrical support portion 56.

(Second modification of the second embodiment)
In the second embodiment, the outer protective tube 4 and the inner protective tube 3 are formed in a state where they do not come into contact with each other (each of them is formed so as to be able to swing independently). The inner protective tube 3 may be integrated.

  In this embodiment, as shown in FIG. 9, the outer protective tube 4 is a cylindrical member having a circular cross section with both ends opened, and when the inner protective tube 3 is accommodated inside, the inner surface is the inner protective tube. 3 are integrally provided so as to be in contact with the outer peripheral surface 3 (the entire outer peripheral surface is in contact).

  In this embodiment, since the external protective tube 4 and the internal protective tube 3 are integrally formed in a swingable state, each of the external protective tube 4 and the internal protective tube 3 is displaced by another protective tube. No longer regulated. That is, similarly to the second embodiment, an effect of suppressing breakage of the temperature measuring probe 1 is exhibited.

  Furthermore, in this embodiment, since the external protective tube 4 and the internal protective tube 3 are integrally formed, the exposed area of the internal protective tube 3 is reduced. That is, the area in which the inner protective tube 3 is in contact with the molten metal is reduced, and wear of the inner protective tube 3 due to contact with the molten metal is suppressed.

1: Temperature measuring probe 2: Thermocouple 3: Internal protection tube 4: External protection tube 5: Flange 6: Joining material 7: Thermal insulation member 8: Support pin 9: Mounting bracket

Claims (6)

A temperature measuring probe that measures the temperature of the molten metal by immersing the tip in the molten metal,
A temperature measuring means for measuring the temperature at the tip of the temperature measuring probe;
An internal protective tube whose tip is closed to accommodate the temperature measuring means;
A flange for positioning the temperature measuring probe;
Have
The inner protective tube has a recess that is recessed from the outer peripheral surface thereof, and a locking projection that supports the inner protective tube is fixed to the flange by inserting the tip of the flange into the recess.
A temperature measuring probe, wherein the inner protective tube is supported by the flange in a state in which a distal end portion thereof is allowed to be displaced in at least one of an axial direction, a radial direction, and a circumferential direction.   The temperature measuring probe according to claim 1, wherein a base end portion of the inner protective tube is supported in a state in which a distal end can swing. The concave portion is a groove extending in the circumferential direction of the inner protective tube,
The temperature measuring probe according to claim 1 , wherein one or more locking protrusions are inserted into the recess. The temperature measuring probe, to form at least part of the outer peripheral surface of the surveying temperature probe, according to claim 1 having an external protective pipe made of ceramic which accommodates the inner protective tube therein Temperature probe. The temperature measuring probe according to claim 4 , wherein the position of the external protective tube relative to the flange is fixed. The temperature measuring probe according to claim 4 , wherein the external protective tube is supported by the flange in a swingable state.

Images