JP2018017699A - Load detection sensor unit, bearing device, and continuous casting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load measurement sensor unit which is small in a dimension in a load direction.SOLUTION: A load detection sensor unit 11 has a plate part 13 arranged at a seat face BS, a plurality of protrusions 15 which protrude from a plate face 131 at a side opposite to the seat face BS of the plate part 13, and whose tip ends form a pressure-receiving face 151, and a strain gauge 16 for detecting the strain of the protrusions 15. A peripheral groove 132 in which the protrusions 15 are formed is formed at the plate part 13. The protrusions 15 protrude to the outside of the plate face 131 from a groove bottom part of the peripheral groove 132. The protrusions 15 are connected to the groove bottom part of the peripheral groove 132 via a curved face part 152 having a curvature radius R which expands in a width toward the groove bottom part of the peripheral groove 132. Heights of the protrusions 15 from the groove bottom part of the peripheral groove 132 are those in which an output of the strain gauge 16 with respect to a load applied to the pressure-receiving face 151 is formed into a substantially-linear shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a load detection sensor unit, a bearing device, and a continuous casting facility.

There is known a continuous casting facility that continuously casts molten steel refined in a converter to make a slab (steel cast piece). In this continuous casting equipment, the roll neck for projecting molten steel is supported by bearings at the roll neck portions protruding from both sides. This bearing is subjected to a heavy load during casting in a continuous casting facility and is exposed to a high temperature and humidity atmosphere.
In such equipment, it is difficult to assume how much load is applied to the bearing during casting. Therefore, various load measuring methods have been proposed for the purpose of grasping this load.

  For example, as shown in FIG. 10, with respect to the outer ring 105 that rotatably supports the inner ring 103 via a plurality of rollers 101, notched grooves 107 are provided at a plurality of locations on the outer peripheral side of the outer ring 105, What provided the strain gauge 109 is known.

  As another method, as shown in FIG. 11, a load detection sensor unit 201 is assembled to a bearing device 203 that supports a roll 202. The bearing device 203 includes a housing 205 that supports the rolling bearing 204, and the load detection sensor unit 201 is disposed between the housing 205 and the base 206. As shown in FIG. 12, the load detection sensor unit 201 has a cylindrical load cell main body 210 in which pressure receiving surfaces 211 and 213 for receiving a measurement load are set at both ends in the axial direction, and is attached to the outer peripheral surface of the load cell main body 210. A plurality of strain gauges 215 and a protective cover 217 that hermetically seals and covers the periphery of the strain gauges 215 (Patent Documents 1 and 2).

Japanese Patent No. 4370717 Japanese Patent No. 5737762

However, the load measuring method shown in FIG. 10 has a problem that the strength of the outer ring 105 is lowered because the notch groove 107 is provided in the outer ring 105 of the bearing.
Further, in the load measuring method described in Patent Document 1, due to the structure in which the pressure receiving surfaces 211 and 213 are provided at the upper and lower ends of the load cell main body 210, the height dimension of the load detecting sensor unit 201 in the vertical direction (load direction). H (see FIG. 11) increases. The space around the bearing used in the continuous casting facility is very limited in the space in which the load detection sensor unit 201 can be installed. In particular, the space between the housing 205 and the base 206 is narrow, so the height in the load direction is high. Development of a sensor unit for measuring a bearing load having a smaller dimension H is required.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sensor unit for measuring a load having a smaller dimension in the load direction than the conventional one, a bearing device including the same, and a continuous casting facility. It is in.

The above object is achieved by the following configuration.
(1) a plate part;
Two or more projecting portions provided protruding from the plate surface on one side of the plate portion, the projecting ends of which form a pressure receiving surface;
A strain gauge provided on the protrusion,
A load detection sensor unit.
(2) The load detecting sensor unit according to (1), wherein the plate portion is formed with a groove recessed in a plate thickness direction, and the protrusion protrudes from a groove bottom portion of the groove.
(3) The load detecting sensor unit according to (2), wherein the protrusion is connected to the groove bottom portion through a curved surface portion that widens from the plate surface side of the one side toward the groove bottom portion.
(4) The load detection sensor unit according to (2) or (3), wherein the height of the protrusion from the groove bottom is a height at which the output of the strain gauge with respect to the load applied to the pressure receiving surface becomes substantially linear. .
(5) The load detection sensor unit according to any one of (1) to (4), wherein the plate portion includes a wiring groove that accommodates a wiring connected to the strain gauge.
(6) The load detecting sensor unit according to any one of (1) to (5), wherein the plate portion has a plate surface on one side covered with an insulating material.
(7) a rolling bearing that supports the rotating shaft;
A housing for holding the rotating shaft via the rolling bearing;
With
A bearing device in which the load detection sensor unit of any one of (1) to (6) is provided below the housing.
(8) The bearing device according to (7), wherein only one load detection sensor unit is arranged directly below the housing in the vertical direction.
(9) A continuous casting facility in which the bearing device of (7) or (8) is incorporated in a roll.

  According to the present invention, it is possible to detect the load in a more limited space by making the dimension in the load direction of the load measuring sensor unit smaller than the conventional one.

It is a perspective view which illustrates an embodiment of a sensor unit for load detection of the present invention. It is II-II sectional drawing of FIG. It is a circuit diagram of the Wheatstone bridge circuit comprised by the some strain gauge with which the sensor unit for load detection of FIG. 1 is provided. It is a front view which shows the aspect which applied the sensor unit for load detection to the bearing apparatus for continuous casting installations. (A) is an exploded perspective view showing a state in which the load detection sensor unit constituting the bearing device and the lower element of the split housing are separated. (B) is a perspective view showing a state where the load detection sensor unit and the lower element of the split housing are joined. It is a front view which shows the bearing apparatus of another aspect. It is VII-VII sectional drawing of FIG. (A) is a perspective view which shows another aspect of the sensor unit for load detection. (B) is a perspective view which shows another aspect of the sensor unit for load detection. It is a graph which shows the measurement result of the load detection characteristic (detection characteristic of the distortion amount with respect to a load) by the sensor unit for load detection. (A) is a fragmentary sectional view along the axial direction of a bearing device to which a conventional bearing load measuring method is applied. (B) is a fragmentary sectional view along the radial direction of the bearing device of (A). It is a fragmentary sectional view of a bearing device to which another conventional bearing load measuring method is applied. FIG. 12 is a partially broken perspective view of a conventional load detection sensor unit provided in the bearing device of FIG. 11.

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

First, an embodiment of a load detection sensor unit will be described.
As shown in FIGS. 1 and 2, the load detection sensor unit 11 of the present embodiment includes a plate portion 13 installed on a seating surface BS (corresponding to the base 206 in FIG. 11), and a seating surface of the plate portion 13. Two or more projecting portions 15 projecting from a plate surface (hereinafter also referred to as “upper surface”) 131 opposite to the BS 131, the projecting ends of which form a pressure receiving surface 151, and a strain gauge 16 for detecting strain of the projecting portions 15; Have. In the illustrated projecting portion 15, a total of four projecting portions 15 a, 51 b, 15 c, and 15 d are formed on one plate surface of the plate portion 13, but the number of projecting portions is not limited thereto.

  The plate portion 13 is a flat rectangular plate-shaped element that forms the main body of the load detection sensor unit 11. On the upper surface 131 side of the plate portion 13, a circumferential groove (concave portion) 132 in which the protruding portion 15 is disposed, a wiring groove 133 that accommodates wiring, and a fitting convex portion that fits into a fitting concave portion 333 of the housing 33 described later. 134, etc. are provided. In addition, a cooling through hole 135 to which cooling water is supplied, an insertion hole 136 for inserting a fixing bolt (not shown), and the like penetrate through the plate portion 13 in the plate thickness direction (load direction). Is provided.

  The protrusions 15 are disposed in the vicinity of both long sides of the plate part 13 and at four positions that are symmetrical with respect to the center of gravity of the plate part 13. The shape of the protrusion 15 is a substantially rectangular parallelepiped shape, but is not limited thereto. The strain gauge 16 is attached to one side surface of each protrusion 15. In the example of illustration, it is affixed on the side surface of the projection part 15 which mutually opposes in the long side direction of the board part 13, but it is not restricted to this.

  As shown in FIG. 2, the protrusion 15 (15a, but also 15b to 15d) protrudes outside the plate surface 131 from the groove bottom of the circumferential groove 132 that is recessed in the plate thickness direction. The protrusion 15 is connected to the groove bottom of the circumferential groove 132 through a curved surface 152 having a radius of curvature R that widens from the plate surface 131 side toward the groove bottom of the circumferential groove 132. The height dimension H1 from the groove bottom of the circumferential groove 132 of the protrusion 15 is a height at which the output of the strain gauge 16 with respect to the load applied to the pressure receiving surface 151 becomes substantially linear. The curvature radius R of the curved surface portion 152 is appropriately selected according to the output characteristics of the strain gauge 16 with respect to the load applied to the pressure receiving surface 151.

  The strain gauge 16 includes active gauges A1 to A4 for detecting the compressive strain of the protrusion 15, dummy gauges D1 to D4 used for temperature compensation of detected values by the active gauges A1 to A4, and connection terminals 161 to 161. 164. That is, the projection 15a is provided with an active gauge A1 and a dummy gauge D1, and the projection 15b is provided with an active gauge A2 and a dummy gauge D2. The projection 15c is provided with an active gauge A3 and a dummy gauge D3, and the projection 15d is provided with an active gauge A4 and a dummy gauge D4.

  The active gauges A1 to A4 and the dummy gauges D1 to D4 are connected to the connection terminals 161 to 164, respectively, and the input signal line 165 and the output signal line 166 are connected to the connection terminals 161 to 164, respectively. Thereby, the Wheatstone bridge circuit 17 illustrated in FIG. 3 is configured. The input signal line 165 and the output signal line 166 are connected to the heat-resistant cable 19 (see FIG. 5) drawn out of the plate portion 13 through the wiring groove 133.

  Of the upper surface 131 of the plate portion 13, at least the circumferential groove 132 and the wiring groove 133 in which the protruding portion 15 is disposed are covered with an insulating material such as silicon and are protected with waterproofness.

  The load detection sensor unit 11 configured as described above is a plate-type sensor unit having a flat rectangular plate-like plate portion 13 as a main body, and the strain gauge 16 and the pressure receiving surface 151 are integrated into the projection portion 15. Is the structure. Compared with the conventional load detection sensor unit 201 shown in FIG. 12, the height dimension H in the load direction can be reduced. Therefore, the load detection sensor unit 11 of the above embodiment can be installed in a narrower space than the conventional load detection sensor unit 201 to perform load detection.

  Furthermore, in the above embodiment, by adopting a structure in which the protrusion 15 protrudes from the bottom of the circumferential groove 132 to the outside of the plate surface 131, the output of the strain gauge 16 with respect to the load applied to the pressure receiving surface 151 is substantially linear. The height dimension H in the load direction of the load detection sensor unit 11 is reduced as compared with the structure in which the protruding portion 15 protrudes directly from the plate surface 131 of the plate portion 13 while ensuring a sufficient height H. Can do.

  Moreover, in the said embodiment, the structure where the projection part 15 was connected to the groove bottom part of the circumferential groove 132 via the curved surface part 152 of the fixed curvature radius R is employ | adopted. Thereby, compared with the case where the boundary of the projection part 15 and the groove bottom part of the circumferential groove 132 is a right angle structure, the stress concerning the projection part 15 can be disperse | distributed and the load bearing performance of a sensor unit can be improved. In addition, this structure can be expected to improve the linearity of the output of the strain gauge 16 with respect to the load applied to the pressure receiving surface 151.

  Further, since the circumferential groove 132 and the wiring groove 133 of the plate portion 13 are covered with an insulating material, it is possible to prevent a short circuit of the electric circuit in the unit due to cooling water or the like.

Next, an aspect in which the load detection sensor unit having the above configuration is applied to a bearing device for continuous casting equipment will be described.
The continuous casting equipment 21 shown in FIG. 4 includes rolling rolls 23a, 23b, and 23c that are divided into three in the axial direction, a rotating shaft 25 to which the rolling rolls 23a, 23b, and 23c are fixed, and a fixed-side end portion of the rotating shaft 25. Between the rotating shaft 25 between the rolling rolls 23a and 23c, and between the rolling rolls 23b and 23c, and between the rolling rolls 23a and 23b. Two bearing devices 30A and 30B that support the portion.

  The bearing devices 30A and 30B include a rolling bearing (not shown) that rotatably supports the rotating shaft 25, housings 33A and 33B that hold the rolling bearing, and the load detection sensor unit 11 illustrated in FIG. The load detection sensor unit 11 is provided directly below the housings 33A and 33B in the vertical direction. The housings 33 </ b> A and 33 </ b> B are split-type housings composed of split elements (upper split element 331 and lower split element 332) having an upper and lower split structure surrounding the rolling bearing.

  As shown in FIG. 5A, the planar shape and dimensions of the lower end portion of the lower divided element 332 of the housings 33 </ b> A and 33 </ b> B coincide with the planar shape and dimensions of the plate portion 13 of the load detection sensor unit 11. . A fitting recess 333 into which the fitting projection 134 of the plate part 13 is fitted and a cooling hole (not shown) communicating with the cooling through hole 135 of the plate part 13 are provided at the lower end of the lower split element 332. It has been. After the lower split element 332 and the plate portion 13 are joined so that the fitting recess 333 and the fitting projection 134 are fitted to each other, a fixing bolt is inserted into the insertion hole 136 of the plate portion 13 and tightened. Thus, as shown in FIG. 5B, the lower split element 332 and the load detection sensor unit 11 are completely fixed and integrated with each other.

  The bearing device 30 configured as described above has a smaller height dimension H (see FIG. 2) in the load direction and higher performance for load detection than the conventional load detection sensor unit 201 shown in FIG. Since the sensor unit 11 is provided, the load of the rolling bearing can be measured with high accuracy while having a very compact structure. In addition, although the example of 2 division is shown in the example of illustration, the division element divided into multiple more than 3 divisions may be sufficient.

  6 and 7 show another embodiment in which the load detection sensor unit of this configuration is used as a bearing device for a continuous casting facility. Here, the same reference numerals are given to components that are the same as or similar in function to the above configuration example, and the description thereof is omitted or simplified as appropriate.

  As shown in FIG. 6, the bearing device 40 includes a housing 41 that is an integrally molded product that is integrally molded as a whole, and a load detection sensor unit 42 is disposed directly below the housing 41 in the vertical direction. The load detection sensor unit 42 is a housing used in the fixed side support portion 27A and the free side support portion 27B shown in FIG.

  As shown in FIG. 7, the load detection sensor unit 42 has the load detection sensor unit 11 illustrated in FIG. 1 in which the arrangement of the protrusions 15 in the plate portion 13 and the arrangement and shape of the circumferential grooves 132 and the wiring grooves 133 are illustrated in FIG. 1. Is different from the conventional load detection sensor unit 201 shown in FIG. 12 in that the height dimension H (see FIG. 2) in the load direction is small and the plate type sensor unit has a high performance. Common. The bearing device 40 can also measure the load of the rolling bearing with high accuracy while having a very compact structure.

  As described above, the present invention is not limited to the above-described embodiments, and those skilled in the art can make changes and applications based on combinations of the configurations of the embodiments, descriptions in the specification, and well-known techniques. This is also the scope of the present invention, and is included in the scope for which protection is sought.

  In the above example, four protrusions 15 are arranged on the plate part 13 of the load detection sensor units 11, 42. However, the number, shape and arrangement of the protrusions 15, the circumferential grooves 132, and the wiring grooves 133 are arranged. The arrangement and shape of the through holes, the presence or absence of the through holes 135 for cooling water, and the like can be appropriately changed according to the load measurement target.

  FIG. 8 shows an example in which the protruding portions 15 are arranged at two locations on the plate portion 13. In the load detection sensor unit 51 of FIG. 8A, two rectangular parallelepiped protrusions 15 extending in the long side direction of the plate portion 13 are arranged in the vicinity of the long sides on both sides of the plate portion 13. The plate 13 is provided with a through hole 135 for cooling water between the protrusions 15 of both protrusions. In the load detection sensor unit 52 in FIG. 8B, the two rectangular parallelepiped projecting portions 15 extending in the short side direction of the plate portion 13 are arranged at positions near the central portion in the long side direction of the plate portion 13. . Further, the plate portion 13 is not provided with a through hole 135 for cooling water. Both of the load detection sensor units 51 and 52 are plate-type sensor units having a flat rectangular plate-like plate portion 13 as a main body, and therefore, the conventional load detection sensor unit 201 shown in FIG. In comparison, the height dimension H in the load direction can be reduced.

  FIG. 9 is a graph showing the measurement results of the output (strain amount) of the strain gauge 16 with respect to the load applied to the pressure receiving surface 151 of the protrusion 15. This measurement is carried out by changing some conditions of the height dimension H1 of the protrusion 15 and records the measurement results under the condition that sufficient linearity of the strain amount with respect to the load is obtained. From this measurement result, it can be seen that if the height dimension H1 of the protrusion 15 is selected to an appropriate value, an accurate strain amount proportional to the load applied to the pressure receiving surface 151 of the protrusion 15 can be detected.

  Further, the continuous casting equipment of the present invention may include at least one of the bearing devices 30A and 30B shown in FIG. 4 and the bearing device 40 shown in FIG. 6 as necessary.

DESCRIPTION OF SYMBOLS 11 Load detection sensor unit 13 Plate part 15,15a, 15b, 15c, 15d Protrusion part 16 Strain gauge 30 Bearing apparatus 33 Housing 40 Bearing apparatus 41 Housing 42, 51, 52 Load detection sensor unit 131 Plate surface 132 Circumferential groove 133 Wiring groove 134 Fitting projection 135 Through hole 136 Insertion hole 151 Pressure receiving surface 152 Curved surface portion 331 Upper division element 332 Lower division element 333 Fitting depression BS Seat surface

Claims (9)

A plate part;
Two or more projecting portions provided protruding from the plate surface on one side of the plate portion, the projecting ends of which form a pressure receiving surface;
A strain gauge provided on the protrusion,
A load detection sensor unit.   The load detecting sensor unit according to claim 1, wherein the plate portion is formed with a circumferential groove that is recessed in a plate thickness direction, and the protruding portion protrudes from a groove bottom portion of the circumferential groove.   3. The load detecting sensor unit according to claim 2, wherein the protrusion is connected to the groove bottom via a curved surface that widens from the plate surface side of the one side toward the groove bottom.   4. The load detecting sensor unit according to claim 2, wherein a height of the protruding portion from the groove bottom is a height at which an output of the strain gauge with respect to a load applied to the pressure receiving surface becomes substantially linear. 5.   The load detection sensor unit according to any one of claims 1 to 4, wherein the plate portion has a wiring groove that accommodates a wiring connected to the strain gauge.   The sensor unit for load detection according to any one of claims 1 to 5, wherein the plate portion has a plate surface on one side covered with an insulating material. A rolling bearing that supports the rotating shaft;
A housing for holding the rotating shaft via the rolling bearing;
With
A bearing device, wherein the load detecting sensor unit according to any one of claims 1 to 6 is provided below the housing.   The bearing device according to claim 7, wherein only one load detection sensor unit is arranged directly below the housing in the vertical direction.   A continuous casting facility in which the bearing device according to claim 7 or 8 is incorporated in a roll.

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