JP2018159480A - Ovality measuring sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ovality measuring sensor for a rotary furnace capable of continuously measuring the deformation of an outer surface of the rotary furnace and monitoring over a long period.SOLUTION: An ovality measuring sensor 101 has a contact surface (a tip surface 11a of a contact rod 11) disposed in contact with an outer surface 91 of a rotary furnace 90, and a measuring surface (a measuring surface 12a of a measuring board 12) disposed on an opposite side of the contact surface, and has a transmission member 1A transmitting the deformation of the outer surface 91 to the measuring surface 12a, and measuring means 2A for measuring the deviation of the measuring surface 12a of the measuring board 12 of the transmission member 1A.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a rotary furnace overlay measuring sensor that is attached to a rotary kiln rotary furnace and measures the displacement of the rotary kiln.

  A rotary kiln (rotary furnace) used in a garbage incineration facility, a cement manufacturing facility, or the like is constituted by a long heavy object (body) formed in a cylindrical shape, as described in, for example, Patent Document 1, The tires are supported by a plurality of tires arranged in parallel along the axial direction of the fuselage and rollers that roll on the tires. For this reason, as described in Patent Document 1, when the rotary kiln is operated for a long time, uneven wear of the tires and rollers, sedimentation of the kiln support foundation (depression of the body) and thermal degradation occur. It is known that in the initial stage where these phenomena occur, the fuselage is distorted, and the overhead (deformation rate of the fuselage) increases. Therefore, by periodically measuring the distortion of the fuselage, it is possible to grasp the situation of wear and deterioration of the fuselage and manage the malfunction of the fuselage.

  For example, as described in Patent Document 2, in the measurement of the rotary kiln's overflow, a fixed length is obtained by holding an overflow measurement sensor (overity tester, deformation measuring device) at a fixed distance from the outer surface of the rotary furnace (shell). The amount of change in the height of the arc that stands on the string of a certain length with the kiln rotation is mechanically expanded by the lever principle, or a measuring instrument such as a differential transformer is used. By measuring and recording, the deformation amount of the rotary furnace is measured.

  Patent Document 2 describes an example of a deformation measuring apparatus using a differential transformer as a measuring instrument for measuring the deformation in the diameter direction of a rotary furnace. In this deformation measuring apparatus, a long and narrow beam to which a differential transformer is fixed is held at a certain distance from the outer surface of the rotary furnace, and the contact at the tip of the differential transformer operating shaft is always pushed downward by a spring so that the rotary furnace The amount of deformation (overity) of the rotary furnace is calculated by measuring the amount of displacement of the working shaft that is brought into contact with the outer surface and displaced up and down depending on the deformation state of the outer surface of the rotary furnace. In this deformation measuring device, legs are fixed to the left and right ends of the beam, and the tip of these legs comes into contact with the outer surface of the rotary furnace, so that the beam is held at a certain distance from the outer surface of the rotary furnace. ing. In addition, an insertion hole for the differential transformer is formed at the center of the beam, and the operation shaft, the spring, and the contact of the differential transformer are exposed below the beam.

JP 2014-185788 A Japanese Patent Laid-Open No. 62-34002

  However, in the deformation measuring apparatus as described in Patent Document 2, since the contact at the tip of the operating shaft of the differential transformer (measuring instrument) is brought into direct contact with the outer surface of the high-temperature rotary furnace, measurement is continuously performed over a long period. Can not do. That is, there is a concern that the differential transformer itself is exposed to a high temperature, thereby causing problems in long-term use. On the other hand, in an overhead measurement sensor used in such a harsh operating environment, it is required to be able to measure continuously over a long period in order to predict the occurrence of trouble in advance and to be able to respond immediately to trouble. It is done.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an overflow measuring sensor for a rotary furnace that can continuously measure the deformation of the outer surface of the rotary furnace and can be monitored over a long period of time.

  The overlap measurement sensor of the present invention has a contact surface disposed in contact with the outer surface of the rotary furnace and a measurement surface disposed on the opposite side of the contact surface, and the deformation of the outer surface is measured by the measurement. A transmission member that transmits to the surface; and a measurement unit that measures the displacement of the measurement surface of the transmission member.

  In the overlay measuring sensor of the present invention, the outer surface of the rotary furnace is not directly measured, but a transmission member that transmits the deformation of the outer surface of the rotary furnace is provided to measure the displacement of the measurement surface of the transmission member. The measuring means itself can be prevented from being exposed to high temperatures without arranging the means facing the outer surface of the high-temperature rotary furnace. Therefore, the deformation of the outer surface of the rotary furnace can be continuously measured and monitored over a long period of time.

  Further, by forming the transmission member with a member having low thermal conductivity such as ceramics or titanium, the influence of heat from the rotary furnace to the measuring means can be further reduced. Therefore, the rotary furnace can be stably monitored over a long period.

  The overlap measurement sensor of the present invention has a closing plate having at least one function of heat insulation or heat insulation between the outer surface of the rotary furnace and the measuring means, and the transmission member is an outer surface of the rotary furnace. The closing plate may have an insertion hole that inserts the contact rod and supports the contact rod so as to move forward and backward in the radial direction of the rotary furnace. .

  By disposing the closing plate between the rotary furnace and the measuring means, the influence of heat applied to the measuring means can be further suppressed. In addition, the measuring circuit of the measuring means can be protected.

  Further, in the overflow measurement sensor of the present invention, the transmission member has a measurement plate attached to a base end portion of the contact rod, the measurement surface is formed on the measurement plate, and the measurement unit includes: A laser displacement sensor that measures the displacement of the measurement surface of the measurement plate that moves following the forward and backward movement of the contact rod may be used.

  By adopting a configuration having a closing plate and a transmission member, a laser displacement sensor, which is a relatively disadvantageous sensor in terms of heat resistance and dust resistance, can be used as the measuring means.

  In the overlay measurement sensor of the present invention, the transmission member has an elastic deformation portion connected to a base end portion of the contact rod, the measurement surface is formed on the elastic deformation portion, and the measurement means includes: The strain gauge may be a strain gauge that is attached to the measurement surface of the elastic deformation portion and measures the deformation of the measurement surface.

  By using a strain gauge with excellent heat resistance and dust resistance, it is possible to stably ensure the long-term use of the overflow measurement sensor.

  In the overlay measurement sensor of the present invention, the transmission member is made of an elastic plate, and the measurement means is a strain gauge that is attached to the measurement surface of the transmission member and measures deformation of the measurement surface. May be.

  By forming the transmission member with an elastic plate, the deformation of the outer surface of the rotary furnace can be reflected on the transmission member with high accuracy despite the fact that the overlap measurement sensor is configured by a simple combination. Moreover, it can serve as a closing board by comprising a transmission member with the member which has at least one function of heat insulation or heat insulation. Furthermore, by using a strain gauge that is excellent in heat resistance and dust resistance, it is possible to stably ensure the long-term use of the overflow measurement sensor.

  The overflow measuring sensor of the present invention preferably has fixing means detachably provided on the outer surface of the rotary furnace, and the fixing means is preferably formed using a magnet.

  If the fixing means is made of a heat-resistant magnet that has a high Curie temperature, such as an Alnico magnet or a samarium cobalt magnet, and can be used at high temperatures, it can be stably fixed by a magnetic force even in a rotary furnace heated to a high temperature. The deformation of the furnace can be measured with high accuracy.

  According to the present invention, deformation of the outer surface of the rotary furnace can be continuously measured and monitored over a long period of time, so that occurrence of trouble can be predicted in advance and can be used for maintenance of the rotary furnace.

It is a perspective view of the overflow measurement sensor of 1st Embodiment of this invention. It is a front view explaining the operation | movement condition of the overflow measurement sensor shown in FIG. It is a perspective view of the overflow measurement sensor of 2nd Embodiment of this invention. It is a front view explaining the operation | movement condition of the overflow measurement sensor shown in FIG. It is a perspective view of the overflow measurement sensor of 3rd Embodiment of this invention. It is a front view explaining the operation | movement condition of the overflow measurement sensor shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an overflow measurement sensor 101 according to the first embodiment. As shown in FIG. 1 and FIG. 2, this overlay measuring sensor 101 is installed on the outer surface 91 of a rotary kiln rotary furnace (steel pipe, shell) 90 heated to a high temperature, and the distortion (deformation) of the rotating rotary furnace 90 rotates. Quantity).

  As shown in FIGS. 1 and 2, the overhead measurement sensor 101 includes a transmission member 1 </ b> A disposed in contact with the outer surface 91 of the rotary furnace 90, measurement means 2 </ b> A for measuring deformation of the transmission member 1 </ b> A, and the rotary furnace 90, the closing plate 3 disposed between the outer surface 91 and the measuring means 2A, the fixing means 4A detachably provided on the outer surface 91 of the rotary furnace 90, and the measuring means 2A and its measuring circuit 21 are accommodated. And a housing 5A.

  The transmission member 1A is configured to include a cylindrical contact bar 11 and a flat measurement plate 12, and is formed of a member having low heat transfer properties such as ceramics or titanium. Further, the contact rod 11 of the transmission member 1 </ b> A is provided so that the tip surface 11 a of the tip portion can contact the outer surface 91 of the rotary furnace 90. Further, a measurement plate 12 is attached to the base end portion of the contact rod 11 of the transmission member 1A, and the contact rod 11 and the measurement plate 12 are integrally provided. As described above, the transmission member 1A has a contact surface (tip surface 11a of the contact bar 11) disposed in contact with the outer surface 91 of the rotary furnace 90, and a measurement surface disposed on the opposite side of the contact surface. (Measurement surface 12a of the measurement plate 12), and the deformation of the outer surface 91 of the rotary furnace 90 is transmitted to the measurement surface 12a.

  As shown in FIGS. 1 and 2, the measurement plate 12 of the transmission member 1 </ b> A is housed inside the housing 5 </ b> A and is disposed between the closing plate 3 and the partition plate 51 of the housing 5 </ b> A. Is always biased downward by a coil spring 52 arranged between the partition plate 51 and the partition plate 51. Therefore, the distal end surface 11a of the contact rod 11 of the transmission member 1A can always be brought into contact with the outer surface 91 of the rotary furnace 90 by the elastic restoring force of the coil spring 52. And the measuring plate 12 is. As the contact bar 11 moves back and forth in the radial direction of the rotary furnace 90 in accordance with the radial deformation of the outer surface 91 of the rotary furnace 90, the measurement plate 12 follows the forward and backward movement of the contact bar 11 as well. It is possible to move forward and backward in 90 radial directions.

  The measuring means 2A comprises a non-contact type laser displacement sensor, and can measure the displacement of the measuring surface 12a of the measuring plate 12 of the transmission member 1A. As described above, the measuring unit 2A can measure the deformation of the outer surface 91 of the rotary furnace 90 via the transmission member 1A that transmits the deformation of the outer surface 91 of the rotary furnace 90. The measurement means 2A is housed inside the housing 5A and is disposed to face the measurement surface 12a of the measurement plate 12 via the partition plate 51 of the housing 5A.

  The partition plate 51 is formed with a measurement hole 53 penetrating in the thickness direction, and the measurement surface 12a of the measurement plate 12 is irradiated with the measurement light (laser light) of the laser displacement sensor through the measurement hole 53. It has become. In addition, you may form in the partition plate 51 the window part formed with the glass which lets infrared rays (measurement light), such as serum glass, pass instead of the measurement hole 53. FIG.

  The closing plate 3 is composed of a material having at least one function of heat insulation or heat insulation. For the closing plate 3, for example, a heat insulating material formed of a heat shielding / heat insulating material such as ceramics can be used. In addition, a heat shield film made of aluminum or the like and a multilayer structure (aluminum multilayer board) in which an aluminum plate is laminated on the upper surface of the heat insulating material constitutes a closing plate 3 having a heat insulating function and a heat shielding function. it can. Moreover, the closure board 3 which improved the heat-shielding performance can also be comprised by performing an alumite process on the lower surface of an aluminum plate.

  Further, as shown in FIGS. 2A and 2B, the closing plate 3 penetrates in the thickness direction (the radial direction of the rotary furnace 90), and the contact rod 11 of the transmission member 1A is inserted and engaged. A possible insertion hole 31 is provided. The contact rod 11 is supported by the engagement with the insertion hole 31 so as to be movable back and forth in the radial direction of the rotary furnace 90. 1 and 2, the closing plate 3 is arranged between the outer surface 91 of the rotary furnace 90 and the measuring means 2A, and the outer surface of the rotary furnace 90 is provided by the closing plate 3. The heat of 91 is interrupted. Therefore, the influence which the measurement means 2A, the measurement circuit 21, etc. receive with the heat of the outer surface 91 of the rotary furnace 90 can be suppressed, and the measurement means 2A etc. can be protected.

  The fixing means 4A is formed of a columnar magnet 41, and the magnet 41 is attached to the lower surface of the closing plate 3 (the surface facing the outer surface 91 of the rotary furnace 90). A plurality (two in this case) of magnets 41 are arranged at intervals in the longitudinal direction of the closing plate 3. In this case, one magnet 41 is disposed at each end of the closing plate 3 in the longitudinal direction, and a total of two magnets 41 are attached. And the overflow measurement sensor 101 is fixed to the outer surface 91 of the rotary furnace 90 formed of steel by the magnetic force of the magnet 41 of the fixing means 4A.

  The magnet 41 is formed of a heat-resistant magnet that has a high Curie temperature and can be used at a high temperature, such as an alnico magnet or a samarium cobalt magnet. By using such a heat-resistant magnet for the fixing means 4A, the overflow measuring sensor 101 can be stably fixed to the rotary kiln rotary furnace 90 heated to a high temperature of 320 ° C. to 400 ° C. by the magnetic force of the magnet 41. The internal temperature of the rotary furnace 90 is a maximum temperature of 1450 ° C. or higher.

  Further, the overhead measurement sensor 101 is provided with the housing 5A as described above. The housing 5A is made of aluminum or the like with high heat dissipation.

  The overlay measurement sensor 101 of the first embodiment configured as described above is used in a state where it is attached to the outer surface 91 of the rotary furnace 90 by the fixing means 4A as shown in FIGS. In such a use environment, when expansion and contraction occur in the rotary furnace 90, the transmission member 1A has a diameter as the outer surface 91 of the rotary furnace 90 is deformed as shown in FIGS. Move forward and backward in the direction. The deformation of the outer surface 91 of the rotary furnace 90 can be measured by measuring the distance to the measurement surface 12a of the measurement plate 12 by the measurement unit 2A in the transmission member 1A moved forward and backward.

  As described above, the overhead measurement sensor 101 does not directly measure the outer surface 91 of the rotary furnace 90, but includes the transmission member 1A that transmits the deformation of the outer surface 91 of the rotary furnace 90, and the measurement surface (measurement plate) of the transmission member 1A. The measurement means 2A is not arranged so as to face the outer surface 91 of the high-temperature rotary furnace 90, and the measurement means 2A itself is exposed to a high temperature. You can avoid that.

  Moreover, since the transmission member 1A that comes into contact with the outer surface 91 of the rotary furnace 90 that is at a high temperature is formed of a member having low thermal conductivity such as ceramics, the measurement surface 12a of the measurement plate 12 can be prevented from being heated. The influence of heat from the rotary furnace 90 on the measuring means 2A can be further reduced. Further, since the closing plate 3 is disposed between the rotary furnace 90 and the measuring means 2A, the heat from the outer surface 91 of the rotary furnace 90 can be blocked by the closing plate 3, and the heat given to the measuring means 2A can be blocked. The influence can be further suppressed. This also protects the measurement circuit 21 and the like of the measurement means 2A.

  In addition, the overlap measurement sensor 101 is configured to include the closing plate 3 and the transmission member 1A between the outer surface 91 of the rotary furnace 90 and the measuring means 2A, so that the outer surface 91 of the rotary furnace 90 is connected to the measuring means 2A. The influence of heat can be suppressed. Therefore, even if a laser displacement sensor, which is a relatively disadvantageous sensor in terms of heat resistance and dust resistance, is used as the measuring means 2A, long-term use of the overflow measurement sensor 101 can be realized. Further, since the measuring means 2A is accommodated in the housing 5A, the effects of heat resistance and dust resistance can be further enhanced, and the measuring means 2A can be protected.

  Thus, by using the overflow measuring sensor 101, the deformation of the outer surface 91 of the rotary furnace 90 can be continuously measured, and the deformation of the rotary furnace 90 can be monitored over a long period of time. Therefore, it is possible to predict in advance the occurrence of troubles with respect to the rotary furnace 90, which can be used for maintenance of the rotary furnace 90.

  Next, a description will be given of the overflow measurement sensor 102 according to the second embodiment of the present invention shown in FIGS. The overlap measurement sensor 101 of the first embodiment uses a laser displacement sensor as the measurement means 2A, but the overlap measurement sensor 102 of the second embodiment is configured using a strain gauge as the measurement means 2B.

  As shown in FIGS. 3 and 4, the overhead measurement sensor 102 of the second embodiment is similar to the first embodiment in that the transmission member 1 </ b> B, the measurement means 2 </ b> B, the closing plate 3, the fixing means 4 </ b> A, It is set as the structure which has the body 5B. Hereinafter, in the overflow measurement sensor 102 of the second embodiment, elements common to the overlap measurement sensor 101 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

The transmission member 1 </ b> B has a cylindrical contact rod 11 and an elastic deformation portion 13. The contact bar 11 is formed of a member having a low heat transfer property such as ceramics or titanium. Moreover, the elastic deformation part 13 is formed with leaf | plate springs, such as a steel plate or an aluminum multilayer board.
The contact rod 11 of the transmission member 1 </ b> B engages with the insertion hole 31 of the closing plate 3 and is provided so as to be movable forward and backward in the radial direction of the rotary furnace 90, and the front end surface 11 a of the front end portion is on the outer surface 91 of the rotary furnace 90. It is provided so that contact is possible. Further, an elastic deformation portion 13 is attached to the base end portion of the contact rod 11 of the transmission member 1B, and the contact rod 11 and the elastic deformation portion 13 are integrally provided, and a measurement surface 13a is formed on the elastic deformation portion 13. Has been.

  As described above, the elastically deforming portion 13 of the transmission member 1B is formed by a leaf spring, and both end portions in the longitudinal direction (the direction along the circumferential direction of the rotary furnace 90) are supported (fixed) on the housing 5B. And the transmission member 1B is always hold | maintained at the state urged | biased below, The elastic member (Blade spring) 13 attached to the contact rod 11 is elastically restoring force of the transmission member 1B by the elastic restoring force. The tip end surface 11 a of the contact bar 11 can always be in contact with the outer surface 91 of the rotary furnace 90. As the contact rod 11 moves forward and backward in the radial direction of the rotary furnace 90 according to the radial deformation of the outer surface 91 of the rotary furnace 90, the elastic deformation portion 13 is bent and deformed. . As described above, the transmission member 1B has a contact surface (tip surface 11a of the contact bar 11) disposed in contact with the outer surface 91 of the rotary furnace 90, and a measurement surface disposed on the opposite side of the contact surface. (The measurement surface 13a of the elastic deformation portion 13) and the deformation of the outer surface 91 of the rotary furnace 90 is transmitted to the measurement surface 13a.

  The measuring means 2B consists of a strain gauge. Moreover, the measurement means 2B is attached to the measurement surface 13a of the elastic deformation portion 13 of the transmission member 1B, and can measure the deformation of the measurement surface 13a of the elastic deformation portion 13. As described above, also in the overlay measurement sensor 102 of the second embodiment, the measuring means 2B can measure the deformation of the outer surface 91 of the rotary furnace 90 via the transmission member 1B that transmits the deformation of the outer surface 91 of the rotary furnace 90. It is said.

  In the overlay measurement sensor 102 of the second embodiment configured as described above, when expansion and contraction occur in the rotary furnace 90 under the use environment, as shown in FIGS. 4A and 4B, the rotary furnace With the deformation of the outer surface 91 of 90, the contact rod 11 of the transmission member 1B moves forward and backward in the radial direction. And the elastic deformation part 13 deform | transforms when the contact rod 11 moves forward and backward. By measuring the deformation of the elastic deformation portion 13 by the measuring means (strain gauge) 2B, the deformation of the outer surface 91 of the rotary furnace 90 can be measured.

  As described above, the overhead measurement sensor 102 of the second embodiment also includes the transmission member 1B that transmits the deformation of the outer surface 91 of the rotary furnace 90, instead of directly measuring the outer surface 91 of the rotary furnace 90, and the transmission member 1B. Since the displacement of the measuring surface 13a of the elastically deforming portion 13 constituting the measuring unit 13 is measured, the measuring unit 2B is not arranged to face the outer surface 91 of the high-temperature rotary furnace 90, and the measuring unit 2B itself has a high temperature. Can be avoided. Further, by using a strain gauge having excellent heat resistance and dust resistance as the measuring means 2B, it is possible to stably ensure the long-term use of the overflow measuring sensor 102. Furthermore, the measuring means 2B using a strain gauge can be configured with low power consumption as compared with the case where a laser displacement sensor is used.

  5 and 6 show an overflow measurement sensor 103 according to a third embodiment of the present invention. As shown in FIGS. 5 and 6, the overflow measurement sensor 103 according to the third embodiment is configured to include a transmission member 1 </ b> C, a measurement unit 2 </ b> C, and a fixing unit 4 </ b> C. It should be noted that the overflow measurement sensor 103 is also provided with a measurement circuit, a housing, and the like of the measurement unit 2C, but is omitted in the description of this embodiment. Also, in the following measurement sensor 103 of the third embodiment, the same reference numerals are given to the same elements as those of the first measurement sensor 101 and the second measurement sensor 102 of the second embodiment. Omitted.

  The transmission member 1C is made of a flat elastic plate, and is formed by a plate spring such as a steel plate or an aluminum multilayer plate, for example. The lower surface 10a of the transmission member 1C is a contact surface disposed in contact with the outer surface 91 of the rotary furnace 90, and an upper surface 10b disposed on the opposite side of the lower surface 10a is a measurement surface. Fixing means 4C made up of magnets 41 are attached to both ends of the longitudinal direction of the upper surface 10b of the transmission member 1C (the direction along the circumferential direction of the rotary furnace 90). The transmission member 1C is sandwiched between the outer surface 91 of the rotary furnace 90 and the fixing means 4C, whereby the lower surface 10a is brought into close contact with the outer surface 91 of the rotary furnace 90, and along the curvature of the outer surface 91 of the rotary furnace 90. It is arranged in an elastically deformed state. And according to the deformation | transformation to the radial direction of the outer surface 91 of the rotary furnace 90, 1 C of transmission members are also bent and deform | transformed. Thus, 1 C of transmission members are set as the structure which transmits the deformation | transformation of the outer surface 91 of the rotary furnace 90 to the upper surface 10b which is a measurement surface.

  Further, it is desirable that the transmission member 1C has a configuration having at least one function of heat insulation or heat insulation. For example, the transmission member 1C having heat shielding performance can be configured by subjecting the surface of a leaf spring made of an aluminum multilayer plate to an alumite treatment.

  The measuring means 2C is composed of a strain gauge. As shown in FIGS. 5 and 6, the measuring means 2C is attached to the upper surface 10b (measurement surface) opposite to the lower surface 10a of the transmission member 1C (contact surface with the outer surface 91 of the rotary furnace 90). The deformation of the upper surface 10b of the transmission member 1C can be measured.

  In the overflow measuring sensor 103 of the third embodiment configured as described above, when the rotary furnace 90 expands and contracts in the use environment, as shown in FIGS. 6A and 6B, the rotary furnace 90 With the deformation of the outer surface 91 of 90, the transmission member 1C is deformed. The deformation of the outer surface 91 of the rotary furnace 90 can be measured by measuring the deformation of the transmission member 1 </ b> C by the measuring means (strain gauge) 2 </ b> C.

  As described above, the overhead measurement sensor 103 according to the third embodiment also includes the transmission member 1C that transmits the deformation of the outer surface 91 of the rotary furnace 90, instead of directly measuring the outer surface 91 of the rotary furnace 90. Since the displacement of the upper surface 10b is measured, the measuring means 2C is not arranged facing the outer surface 91 of the high-temperature rotary furnace 90, and the measuring means 2C itself can be prevented from being directly exposed to a high temperature. . Further, by using a strain gauge having excellent heat resistance and dust resistance as the measuring means 2C, it is possible to stably ensure long-term use of the overflow measurement sensor 103. Furthermore, the measuring means 2C using the strain gauge can be configured with low power consumption as compared with the case where the laser displacement sensor is used.

  Further, in the overflow measurement sensor 103 of the third embodiment, the outer surface 91 of the rotary furnace 90 is deformed even though the transmission member 1C is formed of an elastic plate to constitute the overflow measurement sensor by a simple combination. Can be reflected to the transmission member 1C with high accuracy.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above embodiment, a magnet is used as the fixing means, and the overhead measurement sensor is fixed to the outer surface of the rotary furnace by the magnetic force of the magnet. However, for example, screwing or welding without using the magnet. It is also possible to use other fixing means.

1A, 1B, 1C Transmission members 2A, 2B, 2C Measuring means 3 Closing plates 4A, 4C Fixing means 5A, 5B Housing 11 Contact rod 12 Measuring plate 13 Elastic deformation portion 21 Measuring circuit 31 Insertion hole 41 Magnet 51 Partition plate 52 Coil Spring 53 Measuring hole 90 Rotary furnace 101, 102, 103 Overity measuring sensor

Claims (6)

A contact surface disposed in contact with the outer surface of the rotary furnace, a measurement surface disposed on the opposite side of the contact surface, and a transmission member that transmits deformation of the outer surface to the measurement surface;
Measuring means for measuring the displacement of the measurement surface of the transmission member;
An overhead measurement sensor characterized by comprising: Between the outer surface of the rotary furnace and the measuring means, a closing plate having at least one function of heat insulation or heat insulation,
The transmission member has a contact bar that contacts the outer surface of the rotary furnace,
2. The overflow measuring sensor according to claim 1, wherein the closing plate has an insertion hole that passes through the contact rod and supports the contact rod so as to move forward and backward in a radial direction of the rotary furnace. The transmission member has a measuring plate attached to a proximal end portion of the contact rod;
The measurement surface is formed on the measurement plate;
3. The overflow measuring sensor according to claim 2, wherein the measuring means is a laser displacement sensor that measures the displacement of the measuring surface of the measuring plate that moves following the advancing and retreating movement of the contact bar. The transmission member has an elastic deformation portion connected to a proximal end portion of the contact rod;
The measurement surface is formed on the elastic deformation part,
3. The overflow measuring sensor according to claim 2, wherein the measuring means is a strain gauge that is attached to the measuring surface of the elastically deforming portion and measures the deformation of the measuring surface. The transmission member is made of an elastic plate,
2. The overflow measuring sensor according to claim 1, wherein the measuring means is a strain gauge that is attached to the measuring surface of the transmission member and measures deformation of the measuring surface. It has fixing means detachably provided on the outer surface of the rotary furnace,
The overhead measuring sensor according to any one of claims 1 to 5, wherein the fixing means is formed using a magnet.

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