JP5736762B2 - Bearing unit with sensor for continuous casting equipment roll neck - Google Patents

Description

The present invention relates to a bearing unit with a sensor for a continuous casting equipment roll neck for rotatably supporting a roll used in a continuous casting equipment, for example.

  In a continuous casting facility that continuously casts molten steel smelted in a converter to create a slab (a huge piece of steel), the rolls for feeding the molten steel have roll necks protruding on both sides. Supported by a bearing. In this case, in order to improve the quality, yield, and production capacity of products such as slabs, the bearing can be used continuously for a long time under a special use environment such as high temperature and high humidity. There is a demand for improving durability, that is, fatigue life.

  For such a requirement, it is important to grasp the load applied to the bearing. For example, assuming a bearing that supports the roll neck described above, not only radial load but also axial load acts on the bearing due to thrust force acting on the roll and thermal deformation of the roll when molten steel is sent out. To do. At this time, by detecting these loads and determining the deterioration state of the continuous casting equipment based on the detection result, or by optimizing the load applied to the member to which the inner and outer rings of the bearing are fitted, The fatigue life of the bearing can be improved.

Japanese Patent No. 4370717 JP 20043601 A

  Here, as a technical idea for grasping the load applied to the bearing, for example, a radial load detection technique disclosed in Patent Document 1 and an axial load detection technique disclosed in Patent Document 2 are known. In any technique, a load cell is used, and a load acting on the bearing is detected by the load cell. The load cell is a converter that converts the magnitude of force (load) into an electric signal, and includes a load cell body (straining body) having pressure receiving portions on both sides.

  A plurality of strain gauges are mounted on the peripheral surface of the load cell body, and a Wheatstone bridge circuit is configured by the plurality of strain gauges. In this case, when a load is applied to the bearing on which the load cell is disposed, the load is transmitted to the load cell main body through the pressure receiving portion, and when the load cell main body is distorted, the resistance of the strain gauge depends on the amount of strain. The value changes linearly. At this time, the change in resistance value is converted into an electric signal and output from the load cell. And the load which acted on the bearing is detectable based on the output electrical signal.

  By the way, in the technical field of continuous casting, it is desired that a bearing simultaneously detect both a radial load and an axial load. According to this, it is possible to dramatically improve the quality, yield and production capacity of the product, and to continue to use the bearing continuously for a long period of time in a special use environment such as high temperature and high humidity. The durability that can be achieved, that is, the fatigue life can be improved.

The present invention has been made to meet such a demand, and an object of the present invention is to provide a sensor-equipped bearing unit for a continuous casting equipment roll neck capable of simultaneously detecting both a radial load and an axial load. It is in.

To this end, the continuous casting equipment roll neck sensor with the bearing unit of the present invention is incorporated to enable relative rotation between the shaft and the housing, a bearing for supporting the rotary shaft relative to the housing If, disposed adjacent to both axial sides of the bearing, a sensor for axial loads detecting for detecting a load applied in the axial direction with respect to the bearing, is disposed in the housing, in a radial direction with respect to the bearing and a single radial load detection sensor that detect the load acting, the radial load detection sensor, while the detection center matches the axial center of the bearing, opposite to the radial direction with respect to the bearing As described above, only one axial load detection sensor and the radial are arranged on the outer side of the bearing in a direction orthogonal to the rotation axis. Perform load measurement at the same time heavy detection sensor.
In the present invention, the axial load detection sensor and the housing are each provided with an engaging portion including an engaging convex portion and an engaging hole that can be engaged with each other. By engaging each other, the axial load detection sensor is prevented from rotating with respect to the housing.

ADVANTAGE OF THE INVENTION According to this invention, the bearing unit with a sensor for continuous casting equipment roll necks which makes it possible to detect both a radial load and an axial load simultaneously is realizable.

Sectional drawing which shows the structure of the bearing unit with a sensor for continuous casting equipment roll necks concerning one Embodiment of this invention. (a) is a top view which shows the structure of the load cell for axial load measurement, (b) is a surrounding surface figure which partially shows the structure of the load cell for axial load measurement. The perspective view which shows the structure of the load cell for radial load measurement.

Hereinafter, a sensor-equipped bearing unit for a continuous casting equipment roll neck according to an embodiment of the present invention will be described with reference to the accompanying drawings.
In FIG. 1, in a continuous casting facility that continuously casts molten steel refined in a converter to produce a slab (a huge steel cast piece) (not shown), both sides of a cylindrical roll 2 for feeding the molten steel are shown. A protruding cylindrical roll neck portion (rotating shaft) 2p (only one rotating shaft is shown in the drawing) and a bearing 4 that rotatably supports the roll neck portion 2p with respect to the housing are shown. .

  The bearing 4 is incorporated between the housing and the roll neck portion 2p so as to be relatively rotatable, and supports the roll neck portion 2p so as to be rotatable with respect to the housing. As the bearing 4, for example, a single-row or double-row (self-aligning) ball bearing or roller bearing can be applied. However, as an example, the spherical roller 6 is an inner ring 8 and an outer ring 10 as rolling elements. A spherical roller bearing 4 incorporated in a double row is assumed. The housing is defined as a generic term for a housing Hm, which will be described later, and first to third housing covers (retainers) H1, H2, and H3.

  In this bearing 4, the inner ring 8 is fitted to the roll neck part 2p, and the outer ring 10 is fitted to a housing Hm configured to cover the outer periphery of the roll neck part 2p. On both sides of the housing Hm, first and second housing covers (retainers) H1 and H2 are provided. In the drawing, the state in which the housing Hm and the first housing cover H1 are fastened to each other by the bolt 12 is shown. Similarly, the housing Hm and the second housing cover H2 are also fastened to each other by a bolt (not shown). It is concluded.

  The inner ring 8 is provided with spacers 14 and 16 on both sides thereof. In this state, the third housing cover H3 is set on the projecting end side of the roll neck portion 2p and fastened to each other by a bolt 18. Then, the fastening force acts on the other spacer 16 from the one spacer 14 via the inner ring 8, so that the other spacer 16 comes into pressure contact with the contact surface 2t formed on the roll neck portion 2p. Thereby, the inner ring 8 is positioned in a state of being sandwiched between the spacers 14 and 16.

  Note that seals 20 are interposed between the first housing cover H1 and the roll neck portion 2p and between the second housing cover H2 and the third housing cover H3, respectively. Thereby, the bearing unit space around the bearing 4 is maintained in a sealed state from the outside, and the bearing 4 is prevented from being exposed to a special use environment such as high temperature and high humidity.

  In such a bearing unit space, axial load detection sensors 22a and 22b are disposed adjacent to both axial sides of the bearing 4 (specifically, the outer ring 10). Each of the axial load detection sensors 22a and 22b has a function of detecting a load applied to the bearing 4 (outer ring 10) in the axial direction.

  As the sensors 22a and 22b, for example, a load cell (load converter) that converts the magnitude of force (load) into an electric signal can be applied. In addition, as the load cell, a beam type, a column type, an S-shape, or a diaphragm type can be applied depending on the purpose of use or the usage environment. Here, as an example, the diaphragm type load cells 22a and 22b are used. Suppose.

  Each of the axial load detection sensors (load cells) 22a and 22b includes a hollow cylindrical load cell body (strain generating body) 26 having pressure receiving portions 24 on both sides. A plurality of strain gauges 28 are mounted on the outer peripheral surface of the load cell main body 26, and a Wheatstone bridge circuit (not shown) is configured by the plurality of strain gauges 28.

  In this case, of the axial load detection sensors (load cells) 22a and 22b on both axial sides of the bearing 4 (outer ring 10), one of the load cells 22a has a pressure receiving portion 24 between the outer ring 10 and the first housing cover H1. On the other hand, the other load cell 22b is pressed (clamped) in the axial direction between the outer ring 10 and the second housing cover H2. ing.

  Here, when a load acts on the bearing 4 (outer ring 10) in the axial direction, the load is transmitted to the load cell main body 26 via the pressure receiving portion 24, and when the load cell main body 26 is distorted, the distortion is generated. The resistance value of each strain gauge 28 changes linearly according to the amount. At this time, the change in resistance value is converted into an electric signal and output from both load cells 22a and 22b.

  The electrical signal output from one load cell 22a is transmitted (wireless or wired) to the axial load meter via the cable 30a, and the electrical signal output from the other load cell 22b is transmitted to the axial load meter via the cable 30b. Transmitted (wireless or wired). Then, in the axial load meter, the “axial load” acting on the bearing 4 can be detected by performing predetermined arithmetic processing on the electrical signal.

  As an example, one cable 30a is routed from the first housing cover H1 through the housing Hm to the cable hole 32a that passes through the second housing cover H2, and the other cable 30b is wired. The second housing cover H2 is inserted and wired through the cable hole 32b penetrating the second housing cover H2. In this case, it is preferable that the cable holes 32a and 32b are formed in a portion that does not hinder the detection of the radial load by a radial load detection sensor (load cell) 34 described later. That is, it is preferable that the cable holes 32 a and 32 b are formed in a portion that avoids the detection region interposed between the load cell 34 and the bearing 4.

  Further, in the present embodiment, in addition to the above-described axial load detection sensors 22a and 22b, at least one radial load detection sensor 34 is disposed in a space formed inside the housing Hm. Here, as an example, one radial load detection sensor 34 is assumed, and the sensor 34 has a function of detecting a load acting on the bearing 4 in the radial direction. Specifically, the radial load detection sensor 34 is disposed to face the bearing 4 in the radial direction, and the detection center 34 s of the sensor 34 coincides with the axial center As of the bearing 4. Set to position.

  The detection center 34s of the sensor 34 can be defined as the same center of a plurality of pressure receiving portions 36 (described later) arranged concentrically. Further, the axial center As of the bearing 4 is, for example, a position where the bearing width is equally divided in a direction (axial direction) along the rotation center Ar of the bearing 4 (the inner ring 8 and the outer ring 10), or a double row bearing. Can be defined as a position that bisects the rolling elements in the axial direction, or a position that divides the contact width between the inner and outer rings and the rolling elements in the axial direction in a single row bearing. .

  As the sensor 34, for example, a load cell (load converter) that converts the magnitude of force (load) into an electric signal can be applied. Further, as the load cell, a beam type, a column type, an S-shape, and a diaphragm type can be applied according to the purpose of use and usage environment, but here, as an example, a diaphragm type load cell 34 is assumed. .

  The radial load detection sensor (load cell) 34 includes a hollow cylindrical load cell main body (strain generating body) 38 having a plurality of pressure receiving portions 36 (four as an example in the drawing) arranged concentrically on both sides thereof. ing. A plurality of strain gauges 40 are attached to the outer peripheral surface of the load cell main body 38, and a Wheatstone bridge circuit (not shown) is configured by the plurality of strain gauges 40. In this case, the radial load detection sensor (load cell) 34 is arranged such that the pressure receiving portion 36 is in pressure contact with the housing Hm in the radial direction.

  Here, when a load acts on the bearing 4 (outer ring 10) in the radial direction, the load is transmitted to the load cell main body 38 via the pressure receiving portion 36, and when the load cell main body 38 is distorted, the distortion is generated. The resistance value of each strain gauge 40 changes linearly according to the amount. At this time, the change in resistance value is converted into an electric signal and output from the load cell 34.

  The electrical signal output from the load cell 34 is transmitted (wireless or wired) to the radial load meter via the cable 42. Then, in the radial load meter, the “radial load” acting on the bearing 4 can be detected by performing predetermined arithmetic processing on the electric signal.

  As described above, according to one embodiment, since both the radial load and the axial load can be detected at the same time, it is possible to dramatically improve the quality, yield, and production capacity of the product, as well as special temperatures such as high temperature and high humidity. The durability that enables the bearing 4 to continue to be used continuously over a long period of time, that is, the fatigue life, can be improved under the usage environment.

  Specifically, by comparing the axial load and radial load data detected in the above-described axial load meter and radial load meter with data representing the relationship between the previously detected radial load and the fatigue level of the bearing. The degree of fatigue and abnormality of the bearing 4 can be determined with high accuracy.

  Further, by monitoring the detected axial load and radial load, the fatigue degree and abnormality of the bearing 4 can be accurately diagnosed in a short time (real time). For example, when an axial load and a radial load exceeding a threshold value are detected, it is possible to instantaneously determine that the current bearing 4 is fatigued or abnormal.

  In this case, it is possible to estimate (predict) a more accurate bearing life based on the temporal transition of the monitored axial load and radial load and the accumulated value of each load. For example, life estimation (prediction) can be accurately performed in a short time using data obtained from experiments or past results.

  Furthermore, based on the detected radial load and axial load, it is possible to easily select a bearing suitable for the purpose and environment of use and to examine the bearing specifications without taking time and effort. For example, it becomes easy to select a bearing having a larger load capacity, or to select or develop a bearing having a stronger thrust load.

Note that the present invention is not limited to the above-described embodiment, and the following modifications are also included in the technical idea of the present invention.
For example, in the above-described embodiment, one radial load detection sensor 34 whose detection center 34s is matched with the axial center As of the bearing 4 is assumed, but instead of or in addition to this, the bearing 34 A plurality of radial load detection sensors (load cells) 34 are arranged on both sides of the axial center As of the bearing 4 in the radial direction with respect to the bearing 4, and the detection centers 34 s of the respective sensors 34 are arranged on the bearing 4. You may set to the position symmetrical with respect to the axial direction center As.

  According to this modification, since the load accuracy of the radial load can be further improved by arranging a plurality of the load cells 34, it is possible to further improve the quality and yield of the product, and the production capacity. 4 durability (fatigue life) can be further improved.

  As another modified example, the axial load detection sensors (load cells) 22a and 22b and the first and second housing covers H1 and H2 with which the load cells 22a and 22b are in pressure contact can be engaged with each other. May be provided. Then, the load cells 22a and 22b can be prevented from rotating with respect to the first and second housing covers H1 and H2 by engaging both engaging portions with each other.

  As an example of the engaging portion, a pair of hollow disk-like side walls 44 of the load cells 22a and 22b shown in FIG. 2A described later has two engaging holes 22h concentrically along the circumferential direction. On the other hand, the first and second housing covers H1 and H2 are provided with engaging projections (not shown) that can be engaged with the two engaging holes 22h. Then, the load cells 22a and 22b can be prevented from rotating with respect to the first and second housing covers H1 and H2 by inserting the engaging convex portions into the engaging holes 22h to be engaged with each other.

  In this case, an engagement protrusion may be provided on the hollow disk-shaped side wall 44 on one side of the load cells 22a and 22b, and engagement holes may be formed in the first and second housing covers H1 and H2. The above-described engaging portion is an example, and the load cells 22a and 22b may be prevented from rotating with respect to the first and second housing covers H1 and H2 by other configurations. The shape, number, size, and the like of the engagement hole 22h and the engagement convex portion described above are, for example, the shapes and sizes of the load cells 22a, 22b and the first and second housing covers H1, H2. Therefore, there is no particular limitation here.

  Incidentally, the axial load detection sensors (load cells) 22a and 22b and the radial load detection sensor (load cell) 34 applied to the above-described embodiment (FIG. 1) are general diaphragm types that are distributed in the market. However, the axial load detection sensors (load cells) 22a and 22b are disclosed in Japanese Patent Application Laid-Open No. 2004-3601 for which the applicant of the present application has prior application rights. As the radial load detection sensor (load cell) 34, it is preferable to apply the one shown in "Japanese Patent No. 4370717" for which the applicant of the present invention has a patent right.

  The specific configuration of the axial load detection sensors (load cells) 22a and 22b will be described below with reference to FIG. 2, and the radial load detection sensor (load cell) 34 with reference to FIG. In the description of the load cells 22a, 22b, and 34, the same reference numerals as those in the configuration described in the above-described embodiment (FIG. 1) are assigned to the same reference numerals as those in FIGS. The description is omitted by adding the above.

  As shown in FIGS. 2 (a) and 2 (b), in the axial load detection sensors (load cells) 22a and 22b, hollow disk-shaped side walls 44 are provided on both sides of a hollow cylindrical load cell body (strain body) 26. Are provided so as to face each other in parallel, and the pressure receiving portion 24 is configured to protrude from both hollow disk-shaped side walls 44 by a predetermined amount. In this case, a plurality of pressure receiving portions 24 are arranged at equal intervals along the circumferential direction, and the strain gauge 28 described above is in the same phase as the plurality of pressure receiving portions 24, and the outer peripheral surface or inner peripheral surface of the load cell body 26, Alternatively, it is mounted along the outer and inner peripheral surfaces.

  In addition, about the protrusion amount of the pressure receiving part 24, a magnitude | size, a shape, the number, and the number of the strain gauges 28, the shape and magnitude | size of the said load cells 22a and 22b and the 1st and 2nd housing covers H1 and H2 are mentioned, for example. In this case, the setting is not particularly limited. Other configurations and operations are the same as those described in the above-described embodiment, and thus the description thereof is omitted.

  As shown in FIG. 3, in the radial load detection sensor (load cell) 34, hollow disk-shaped side walls 46 are provided on both sides of a hollow cylindrical load cell body (strain body) 38 so as to face each other in parallel. The pressure receiving portion 36 described above is configured to protrude from both the hollow disk-shaped side walls 46 by a predetermined amount. In this case, a plurality of pressure receiving portions 36 are arranged at equal intervals along the circumferential direction, and the strain gauge 40 described above has the same phase as the plurality of pressure receiving portions 36, and the outer peripheral surface or inner peripheral surface of the load cell main body 34, Alternatively, it is mounted along the outer and inner peripheral surfaces.

  A hollow cylindrical cover 48 that is continuous along the circumferential direction is provided on the outer periphery of the pair of hollow disk-shaped side walls 46 so as to cover the outer peripheral surface of the load cell main body 34. Thereby, the several strain gauge 40 with which the outer periphery surface of the load cell main body 34 was mounted | worn is maintained in the state sealed from the outside.

  Note that the protrusion amount, size, shape, number, and number of strain gauges 40 of the pressure receiving portion 36 and the number of strain gauges 40 are set according to, for example, the shape and size of the load cell 34, and are not particularly limited here. . Other configurations and operations are the same as those described in the above-described embodiment, and thus the description thereof is omitted.

2 roll 2p roll neck (rotating shaft)
4 Bearing 22a, 22b Axial load detection sensor (load cell)
34 Radial load detection sensor (load cell)

Claims (2)

In the continuous casting facilities, it is incorporated to allow relative rotation between the shaft and the housing, and a bearing for supporting the rotary shaft relative to the housing,
Disposed adjacent to both axial sides of the bearing, a sensor for axial loads detecting for detecting a load applied in the axial direction with respect to the bearing,
Wherein arranged in the housing, and a single radial load detection sensor that detect the load acting in the radial direction with respect to the bearing,
The radial load detection sensor is arranged on the outer side of the bearing in a direction perpendicular to the rotation axis so as to face the bearing in the radial direction while the detection center coincides with the axial center of the bearing. A bearing unit with a sensor for a continuous casting equipment roll neck , wherein only one of them is arranged and the load is measured simultaneously by the axial load detection sensor and the radial load detection sensor . The axial load detection sensor and the housing are provided with engaging portions each having an engaging convex portion and an engaging hole that can be engaged with each other, and the engaging portions are engaged with each other. Accordingly, the axial load detection sensor is prevented from rotating with respect to the housing, and the bearing unit with the sensor for the continuous casting equipment roll neck according to claim 1 .

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