JP7052674B2 - Load measurement unit and load measurement method - Google Patents

Description

The present invention relates to a load measuring unit and a load measuring method.

If the bearing used for the roller of the agglomerator in the pretreatment equipment of the coking plant is damaged, the amount of debris (coke production) will decrease, so it is desired to prevent the bearing from being damaged. There is. It is considered that the circumcision is caused by the fact that a load larger than the axial load and radial load assumed in the bearing design is generated. There is a request for measuring the load actually generated and performing the optimum bearing design (for the measurement of the radial load, see, for example, Patent Document 1 below).

Japanese Patent Application Laid-Open No. 55-156608

In measuring the load in the axial direction, it is generally necessary to directly apply the load in the axial direction to the sensor.
However, if an attempt is made to directly apply a load in the axial direction to the sensor, the movement of the bearing in the axial direction is hindered, leading to a bearing lock. For bearings used in a high temperature environment such as the bearings of the above-mentioned agglomerator, in consideration of axial elongation due to heat, etc., the bearing (supported body) is moved in the axial direction (axial direction) with respect to the chock (supported body). It may be necessary for movement to be allowed.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to measure an axial load applied to a support while allowing the supported body to move in the axial direction.

In order to solve the above problems, the present invention proposes the following means.
(1) The load measuring unit according to the present invention is arranged in a support having a fitting hole into which the supported body is fitted and in a recess of the main body formed on the inner peripheral surface of the fitting hole. The sensor unit includes a sensor unit on which an axial load applied from the supported body to the support body acts, and the sensor unit includes a first sensor facing the radial direction of the fitting hole and the circumference of the fitting hole. A second sensor facing a direction, a holder fitted in the recess of the main body, and a pedestal portion arranged in the recess of the pedestal formed in the holder are provided, and the recess of the pedestal has the fitting hole. The bottom surface portion facing the radial direction of the fitting hole and the side surface portion facing the circumferential direction of the fitting hole are provided, and the pedestal portion includes the bottom surface portion facing the radial direction of the fitting hole and the circumference of the fitting hole. The first sensor is arranged between the bottom surface portion of the pedestal recess and the bottom surface portion of the pedestal portion, and the second sensor is a side surface portion of the pedestal recess. It is characterized in that it is arranged between the portion and the side surface portion of the pedestal portion.

In this case, since the first sensor is arranged between the bottom surface portion of the pedestal recess and the bottom surface portion of the pedestal portion, the first sensor can measure the stress generated on the bottom surface portion of the pedestal portion. Further, since the second sensor is arranged between the side surface portion of the pedestal recess and the side surface portion of the pedestal portion, the second sensor can measure the stress generated on the side surface portion of the pedestal portion.
By the way, in this load measuring unit, when a radial load is applied from the supported body to the support, the pedestal portion is pressed in the radial direction (radial direction), and a radial vertical stress is generated on the bottom surface portion of the pedestal portion. At this time, the pedestal portion expands in the circumferential direction while being compressed in the radial direction, and a vertical stress in the circumferential direction is also generated in the side surface portion of the pedestal portion.
When an axial load is applied from the supported body to the support, the top surface of the pedestal is displaced in the axial direction while the bottom surface of the pedestal is held in the axial direction (axial direction) of the fitting hole. The pedestal is shear-deformed in the axial direction. As a result, shear stress is generated on the side surface portion of the pedestal portion, and the normal stress on the side surface portion is reduced. At this time, the stress generated on the bottom surface of the pedestal due to the axial load is small.
That is, when a radial load and an axial load are applied from the supported body to the support, normal stress due to the radial load is mainly generated on the bottom surface portion of the pedestal portion. Therefore, it can be said that the detection result of the first sensor representing the stress generated on the bottom surface of the pedestal has a correlation with the radial load. Therefore, the radial load can be calculated based on the detection result of the first sensor by obtaining the relational expression expressing this correlation in advance.
Further, when a radial load and an axial load are applied from the supported body to the support, normal stress due to the radial load and shear stress due to the axial load are mainly applied to the side surface portion of the pedestal portion. Occurs in. Therefore, it can be said that the detection result of the second sensor representing the stress generated on the side surface portion of the pedestal portion has a correlation with the radial load and the axial load. Here, as described above, since the radial load has a correlation with the detection result (stress generated on the bottom surface of the pedestal portion) of the first sensor, the axial load is the first and second sensors. It can be said that there is a correlation with the detection result of. Therefore, by obtaining the relational expression expressing this correlation in advance, the axial load can be calculated based on the detection results of the first and second sensors.
From the above, the radial load can be calculated based on the detection result of the first sensor, and the axial load can be calculated based on the detection results of the first and second sensors. Further, at this time, the axial load can be calculated based on the stress generated on the side surface portion of the pedestal portion without directly applying the axial load to the sensor. Therefore, it is possible to allow the supported body to move in the axial direction.
When the radial load is not applied from the supported body to the support and only the axial load is applied, the axial load can be calculated based only on the detection result of the second sensor. That is, in this case, the radial load does not affect the detection result of the second sensor, and the detection result of the second sensor has a correlation with only the axial load. Therefore, the axial load can be calculated based on the detection result of the second sensor by obtaining the relational expression expressing this correlation in advance.
Here, the pedestal portion is arranged in the pedestal recess of the holder, and the holder is fitted into the recess of the main body. In this way, the pedestal portion is not directly fitted to the support, but is fitted to the support via the holder. Therefore, instead of directly processing the support, by appropriately processing the holder outside the support, the degree of fitting of the holder to the recess of the main body and the degree of fitting of the recess of the pedestal to the recess of the main body can be adjusted. can do. This makes it possible to realize highly accurate measurement while ensuring the productivity of the load measuring unit.

(2) In the load measuring unit according to (1) above, the first and second sensors may adopt the configuration provided in the pedestal portion.
(3) In the load measuring unit according to (1) or (2) above, the sensor unit adopts a configuration in which a radial load loaded from the supported body to the support and an axial load act on the sensor unit. You may.
(4) In the load measuring unit according to (3) above, the radial load is calculated based on the detection result of the first sensor, and based on the detection results of the first sensor and the second sensor. A configuration may be adopted further including a calculation unit for calculating the axial load.
(5) The load measuring method according to the present invention is a load measuring method for measuring the radial load and the axial load by using the load measuring unit according to the above (3) or (4), and is the first. The radial load is calculated based on the detection result of the sensor, and the axial load is calculated based on the detection results of the first sensor and the second sensor.

(6) The load measuring unit according to the present invention is arranged in a support having a fitting hole into which the supported body is fitted and in a recess of the main body formed on the inner peripheral surface of the fitting hole. The sensor unit includes a sensor unit on which an axial load applied from the supported body to the support body acts, and the sensor unit includes first and second sensors facing the radial direction of the fitting hole, and the recessed portion of the main body. The holder is provided with a holder fitted to the holder and a pedestal portion arranged in the pedestal recess formed in the holder, and the pedestal recess includes a bottom portion facing the radial direction of the fitting hole. The bottom surface portion of the pedestal recess includes first and second inclined surfaces, and the first and second inclined surfaces are arranged side by side in the axial direction of the fitting hole, and the pedestal portion. Is provided with a bottom surface portion that faces the radial direction of the fitting hole, the bottom surface portion of the pedestal portion is provided with third and fourth inclined surfaces, and the third and fourth inclined surfaces are The first sensor is arranged between the first inclined surface and the third inclined surface, and the second sensor is arranged so as to face the first and second inclined surfaces. It is characterized in that it is arranged between the second inclined surface and the fourth inclined surface.

In this case, since the first sensor is arranged between the first inclined surface of the pedestal recess and the third inclined surface of the pedestal portion, the first sensor is placed on the third inclined surface of the pedestal portion. The generated stress can be measured. Further, since the second sensor is arranged between the second inclined surface of the pedestal recess and the fourth inclined surface of the pedestal portion, the second sensor is generated on the fourth inclined surface of the pedestal portion. The stress can be measured.
By the way, in this load measuring unit, when a radial load is applied from the supported body to the support, the pedestal portion is pressed in the radial direction (radial direction), and normal stress is applied to the third and fourth inclined surfaces of the pedestal portion. Occurs.
When an axial load is applied from the supported body to the support, for example, the third inclined surface of the pedestal portion may be pressed against the first inclined surface of the pedestal portion, or the pedestal portion may be pressed according to the direction of the axial load. The fourth inclined surface of the pedestal recess may be pressed against the second inclined surface of the pedestal recess. As a result, for example, normal stress is generated on the third and fourth inclined surfaces of the pedestal portion.
That is, when a radial load and an axial load are applied from the supported body to the support, normal stress due to the radial load and the axial load is generated on the third and fourth inclined surfaces of the pedestal portion. Of the detection results of the first and second sensors representing the stress generated on the third and fourth inclined surfaces of the pedestal portion, the radial component force (radial component force) of the fitting hole is the radial load. It can be said that there is a correlation between them, and it can be said that the axial component force (axial component force) of the fitting hole has a correlation with the axial load. Therefore, by obtaining the relational expression expressing this correlation in advance, the detection results of the first and second sensors (the radial component force and the axial component force obtained from the detection results of the first and second sensors). ), The radial load and the axial load can be calculated. At this time, the axial load can be calculated based on the stress generated on the third and fourth inclined surfaces of the pedestal portion without directly applying the axial load to the sensor. That is, the axial load can be calculated not in a state where the sensors are arranged on both sides in the axial direction with respect to the supported body, but in a state where the sensors are arranged radially outside the supported body. Therefore, the axial load can be calculated without restricting the axial movement of the supported body.
In order to obtain the radial component force and the axial component force from the detection results of the first and second sensors, the direction perpendicular to the third inclined surface of the pedestal portion and the load direction to which the radial load is applied are set. A first angle between them and a second angle between the direction perpendicular to the fourth inclined surface of the pedestal portion and the load direction to which the radial load is applied can be used.
Further, when the radial load is not applied from the supported body to the support and only the axial load is applied, the axial load can be calculated based only on the detection result of the second sensor. That is, in this case, the radial load does not affect the detection result of the second sensor, and the detection result of the second sensor has a correlation with only the axial load. Therefore, the axial load can be calculated based on the detection result of the second sensor by obtaining the relational expression expressing this correlation in advance.

(7) In the load measuring unit according to (6) above, the first and second inclined surfaces form a shape in which the center of the bottom surface of the pedestal recess is recessed, and the third and fourth inclined surfaces are inclined. The surface may adopt a structure in which the center of the bottom surface portion of the pedestal portion is convex.
(8) In the load measuring unit according to (6) above, the first and second inclined surfaces form a shape in which the center of the bottom surface of the pedestal recess is convex, and the third and fourth inclined surfaces are formed. The inclined surface may adopt a structure in which the center of the bottom surface portion of the pedestal portion is recessed.
(9) In the load measuring unit according to any one of (6) to (8) above, the first and second sensors may adopt the configuration provided in the pedestal portion.
(10) In the load measuring unit according to any one of (6) to (9) above, the radial load and the axial load applied from the supported body to the support act on the sensor unit. May be adopted.
(11) In the load measuring unit according to (10) above, the first angle between the direction perpendicular to the third inclined surface and the load direction to which the radial load is applied, and the fourth inclined surface. A calculation unit that calculates the radial load and the axial load based on the second angle between the vertical direction and the load direction to which the radial load is applied, and the detection results of the first and second sensors. A configuration may be adopted in which the above is further provided.
(12) The load measuring method according to the present invention is a load measuring method for measuring the radial load and the axial load by using the load measuring unit according to the above (10) or (11), and is the third. A first angle between the direction perpendicular to the inclined surface and the load direction to which the radial load is applied, and a second angle between the direction perpendicular to the fourth inclined surface and the load direction to which the radial load is applied. It is characterized in that the radial load and the axial load are calculated based on the angle and the detection results of the first and second sensors.

According to the present invention, it is possible to measure the axial load applied to the support while allowing the supported body to move in the axial direction.

It is sectional drawing which shows the lumping machine which concerns on 1st Embodiment of this invention, and is the figure which shows the state which the roll is seen from the side. It is a perspective view of the load measuring unit which constitutes the agglomerating machine shown in FIG. It is an exploded perspective view of the main part of the load measuring unit shown in FIG. FIG. 3 is a plan view of the sensor unit constituting the load measuring unit shown in FIG. 2 as viewed from the inside in the radial direction. It is a front view of the holder constituting the sensor unit shown in FIG. 4 seen from the axial direction. It is a bottom view of the pedestal portion constituting the sensor unit shown in FIG. 4 seen from the outside in the radial direction. It is a side view which looked at the pedestal part shown in FIG. 6 from the outside in the circumferential direction. 6 is an enlarged side view of the overhanging table provided on the pedestal portion shown in FIGS. 6 and 7. It is a control block diagram of the load measuring unit shown in FIG. It is a figure explaining the operation of the load measuring unit shown in FIG. 4, and is the schematic cross-sectional view of the load measuring unit corresponding to the XX arrow view shown in FIG. It is sectional drawing of the load measuring unit which shows the state which the radial load is applied to the pedestal part of the load measuring unit shown in FIG. It is a figure explaining the operation of the load measuring unit shown in FIG. 4, and is a schematic cross-sectional view of the load measuring unit corresponding to the arrow of XII-XII shown in FIG. FIG. 3 is a cross-sectional view of the load measuring unit showing a state in which an axial load is applied to the pedestal portion of the load measuring unit shown in FIG. It is a graph which shows the simulation result in the verification process of the sensor unit shown in FIG. 4, and is the graph which shows the detection result of the 1st sensor and the 2nd sensor when a radial load is applied to a pedestal part. It is a graph which shows the simulation result in the verification process of the sensor unit shown in FIG. 4, and is the graph which shows the detection result of the 1st sensor and the 2nd sensor when an axial load is applied to a pedestal part. It is a graph which shows the simulation result in the verification process of the sensor unit shown in FIG. 4, and is the graph which compares the calculation result of a radial load with the simulation value. It is a graph which shows the simulation result in the verification process of the sensor unit shown in FIG. 4, and is the graph which compares the calculation result of the axial load with the simulation value. It is a perspective view of the load measuring unit which constitutes the agglomerating machine which concerns on 2nd Embodiment of this invention. FIG. 18 is an exploded perspective view of a main part of the load measuring unit shown in FIG. FIG. 18 is a plan view of the holder of the sensor unit constituting the load measuring unit shown in FIG. 18 as viewed from the inside in the radial direction. It is a side view which looked at the holder shown in FIG. 20 from the circumferential direction. It is sectional drawing of the holder corresponding to the arrow view of XXII-XXII shown in FIG. It is sectional drawing of the holder corresponding to the arrow view of XXIII-XXIII shown in FIG. It is sectional drawing of the holder corresponding to the arrow view of XXIV-XXIV shown in FIG. FIG. 18 is a front view of the pedestal portion of the sensor unit constituting the load measuring unit shown in FIG. 18 as viewed from the circumferential direction. FIG. 5 is a side view of the pedestal portion shown in FIG. 25 as viewed from the axial direction. It is a bottom view which looked at the pedestal part shown in FIG. 25 from the outside in the radial direction. It is a perspective view which looked at the pedestal part shown in FIG. 25 from the outside in the radial direction. It is a figure corresponding to the front view of the pedestal part shown in FIG. 25, and is the figure which shows the state which the radial load F is applied from the roll to the bearing chock. It is a figure corresponding to the front view of the pedestal part shown in FIG. 25, and is the figure which shows the state which the axial load W is applied from the roll to the bearing chock. It is a figure of the holder of the load measuring unit which constitutes the agglomerating machine which concerns on the 1st modification of 2nd Embodiment of this invention, and is the sectional view of the holder corresponding to the arrow view of XXII-XXII shown in FIG. It is a perspective view of the holder of the load measuring unit which constitutes the agglomerating machine which concerns on the 2nd modification of 2nd Embodiment of this invention. FIG. 32 is a cross-sectional view taken along the line XXXIII-XXXIII shown in FIG. 32. It is a perspective view of the pedestal part which constitutes the load measuring unit shown in FIG. 32. It is a perspective view of the holder of the load measuring unit which constitutes the agglomerating machine which concerns on the 3rd modification of 2nd Embodiment of this invention. FIG. 35 is a cross-sectional view taken along the line XXXVI-XXXVI shown in FIG. 35. It is a perspective view of the pedestal part which constitutes the load measuring unit shown in FIG. 35. It is a side view of the pedestal part shown in FIG. 37.

(First Embodiment)
Hereinafter, the agglomerator 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 17. The agglomerator 10 is installed in a pretreatment facility of a coking plant.
As shown in FIG. 1, the agglomerator 10 includes a roll 20 (supported body, rotating body) and a load measuring unit 30.

The roll 20 includes a shaft portion 21 and a pair of bearings 22. The pair of bearings 22 are provided at both ends of the shaft portion 21. Examples of the bearing 22 include a radial bearing, and in the present embodiment, a case where a self-aligning roller bearing is adopted as the bearing 22 will be shown. In the following, the axial direction of the shaft portion 21 is referred to as the axial direction X (the axial direction of the fitting hole 42 described later), and the radial direction of the shaft portion 21 is referred to as the radial direction R (the radial direction of the fitting hole 42). The circumferential direction of the shaft portion 21 is referred to as the circumferential direction C (the circumferential direction of the fitting hole 42).

The load measuring unit 30 includes a bearing chock 41 (support), a sensor unit 50, and a calculation unit 56.
The bearing chock 41 supports the roll 20. A pair of bearing chock 41 is provided so as to support both ends of the roll 20. The pair of bearing chock 41 supports each of the pair of bearings 22. The bearing chock 41 is formed of, for example, SS400 or the like.

A fitting hole 42 is formed in the bearing chock 41. The roll 20 is fitted in the fitting hole 42. In the present embodiment, the fitting hole 42 is formed inside the bearing chock 41, and the bearing 22 is fitted in the fitting hole 42. In this embodiment, a pair of bearing chock 41 supports the roll 20 in a state where the roll 20 is fitted in the fitting hole 42.

Of the pair of bearing chock 41, the first bearing chock 41a supports the roll 20 in a state where the roll 20 is allowed to move in the axial direction X, and the second bearing chock 41b moves the roll 20 in the axial direction X. Support in a regulated state. In the following, the side of the first bearing chock 41a along the axial direction X is referred to as the first side Xa, and the side of the second bearing chock 41b is referred to as the second side Xb.

As shown in FIGS. 2 and 3, the inner peripheral surface of the fitting hole 42 (hereinafter referred to as “first fitting hole 42a”) of the first bearing chock 41a has a main body recess (main body groove, main body accommodating portion) on the inner peripheral surface. ) 43 is formed. The main body recess 43 is formed on the inner peripheral surface of the first fitting hole 42a over the entire length in the axial direction X. The main body recess 43 is formed in a rectangular shape in a cross-sectional view orthogonal to the axial direction X. The main body recess 43 includes a bottom surface portion 43a facing the radial direction R and a pair of side surface portions 43b facing the circumferential direction C. In the front view seen from the axial direction X, the bottom surface portion 43a and the side surface portion 43b form 90 degrees. The pair of side surface portions 43b are substantially parallel over the entire length in the axial direction X.

The sensor unit 50 is arranged in the recess 43 of the main body. A radial load and an axial load applied from the roll 20 (bearing 22) to the bearing chock 41 act on the sensor unit 50. The sensor unit 50 includes a holder 51, a pedestal portion 52, a first sensor 54, and a second sensor 55.

As shown in FIGS. 3 to 5, the holder 51 is fitted (tightened) in the recess 43 of the main body. The holder 51 is formed in a rectangular parallelepiped shape that is long in the axial direction X. The holder 51 includes a bottom surface portion 51a and a top surface portion 51c facing the radial direction R, a pair of side surface portions 51b facing the circumferential direction C, and a pair of end face portions 51d facing the axial direction X. In the front view seen from the axial direction X, the bottom surface portion 51a and the side surface portion 51b form 90 degrees, and the top surface portion 51c and the side surface portion 51b also form 90 degrees. The top surface portion 51c of the holder 51 is formed flush with the inner peripheral surface of the first fitting hole 42a. The pair of end face portions 51d are arranged at both ends of the holder 51 in the axial direction X.

The holder 51 is formed of, for example, SUS603 or the like. For example, the tolerance class of the main body recess 43 (JIS B 0401-1: 2016, the same applies to the following tolerance classes) can be set to H7, and the tolerance class of the holder 51 can be set to r6. When no load is applied from the roll 20 to the bearing chock 41 (hereinafter referred to as "no load state"), the surface pressure between the bottom surface portions 43a and 51a of the main body recess 43 and the holder 51 and the surface pressure between the side surface portions 43b and 51b are The surface pressure (hereinafter referred to as “first surface pressure”) can be, for example, 9.7 MPa to 65.7 MPa.

The holder 51 is formed with a pedestal recess (pedestal groove, pedestal accommodating portion) 57. The pedestal recess 57 is arranged on the inner peripheral surface of the first fitting hole 42a. The pedestal recess 57 is formed in the top surface portion 51c of the holder 51. The pedestal recess 57 extends in the axial direction X. In the present embodiment, the pedestal recess 57 is open to the end face portion 51d facing the first side Xa and non-opening to the end face portion 51d facing the second side Xb among the pair of end face portions 51d of the holder 51. ..

The pedestal recess 57 is formed in a rectangular shape in a cross-sectional view orthogonal to the axial direction X. The pedestal recess 57 includes a bottom surface portion 57a facing the radial direction R, a pair of side surface portions 57b facing the circumferential direction C, and an end face portion 57d facing the axial direction X. In the front view seen from the axial direction X, the bottom surface portion 57a and the side surface portion 57b form 90 degrees. A drawer groove 58 extending in the axial direction X is formed in the bottom surface portion 57a. A pair of drawer grooves 58 are arranged at intervals in the width direction of the pedestal recess 57. The pair of side surface portions 57b are substantially parallel over the entire length in the axial direction X. The end face portion 57d is arranged at the end portion of the second side Xb in the pedestal recess 57. The end face portion 57d is formed in a curved shape that is convex toward the second side Xb in a plan view seen from the inside in the radial direction R.

The holder 51 is assembled to the support 41 by being fitted into the main body recess 43 as described above. As a result, the top surface portion 51c of the holder 51 becomes flush with the inner peripheral surface of the first fitting hole 42a as described above.

As shown in FIGS. 3, 4, 6 and 7, the pedestal portion 52 is fitted (tightened) to the pedestal recess 57 and arranged. The pedestal portion 52 is formed in a rectangular parallelepiped shape that is long in the axial direction X.
The pedestal portion 52 includes a bottom surface portion 52a and a top surface portion 52c facing the radial direction R, a pair of side surface portions 52b facing the circumferential direction C, and a pair of end face portions 52d facing the axial direction X. When viewed from the front in the axial direction X, the bottom surface portion 52a and the side surface portion 52b form 90 degrees, and the top surface portion 52c and the side surface portion 52b also form 90 degrees. As described above, the top surface portion 51c of the holder 51 is flush with the inner peripheral surface of the first fitting hole 42a, and the top surface portion 52c of the pedestal portion 52 is the inner peripheral surface of the first fitting hole 42a and the inner peripheral surface. It is formed flush with the top surface portion 51c of the holder 51. The pair of end face portions 52d are arranged at both ends of the pedestal portion 52 in the axial direction X. Each of the pair of end face portions 52d is formed in a curved shape that is convex toward the first side Xa or the second side Xb in a plan view seen from the inside in the radial direction R.

As shown in FIG. 8, an overhanging table 59 is provided on each of the bottom surface portion 52a and the top surface portion 52c of the pedestal portion 52. A plurality of overhanging tables 59 are provided on the bottom surface portion 52a and the side surface portion 52b at intervals in the axial direction X. Three overhanging tables 59 are arranged on each of the bottom surface portion 52a and the side surface portion 52b. The overhanging table 59 is arranged at the same position in the axial direction X on each of the bottom surface portion 52a and the top surface portion 52c. The overhanging table 59 is provided at the total width of the circumferential direction C on the bottom surface portion 52a and the total width of the radial direction R on the side surface portion 52b. The overhanging table 59 is formed in a rectangular shape in both the plan view of the bottom surface portion 52a and the plan view of the side surface portion 52b. The overhanging amount of each overhanging table 59 is uniform over the entire area. The amount of overhang is smaller than the width of the pedestal portion 52 in the circumferential direction C and the height in the radial direction R.

In each of the bottom surface portion 52a and the side surface portion 52b, a recess portion 60 is formed between the overhanging tables 59 adjacent to each other in the axial direction X. The recessed portion 60 is provided in the entire width of the circumferential direction C on the bottom surface portion 52a and the entire width of the radial direction R on the side surface portion 52b. The recessed portion 60 is formed in a rectangular shape in both the plan view of the bottom surface portion 52a and the plan view of the side surface portion 52b. The amount of dents in each dent portion 60 is uniform over the entire area.

As shown in FIGS. 3 and 4, a pair of pedestal portions 52 are provided at intervals in the axial direction X. The pair of pedestals 52 are formed to have the same shape and the same size as each other. The pair of pedestals 52 are arranged at positions equivalent to the rolling element 22a (see FIG. 1) of the bearing 22 in the axial direction X, and are located outside the radial direction R of the rolling element 22a.
The pedestal portion 52 is formed of, for example, SUS630 or the like. For example, the tolerance class of the pedestal recess 57 may be H7, and the tolerance class of the pedestal portion 52 may be r6. Under no load, the surface pressure between the bottom surface portions 57a and 52a of the pedestal recess 57 and the pedestal portion 52 and the surface pressure between the side surface portions 57b and 52b (hereinafter referred to as "second surface pressure") are, for example, 3. It can be 6 MPa to 21.0 MPa.

As shown in FIGS. 3 and 6, the first sensor 54 faces the radial direction R, and the second sensor 55 faces the circumferential direction C. The first and second sensors 54 and 55 are provided (fixed) to the pedestal portion 52. The first sensor 54 is arranged between the bottom surface portion 43a of the main body recess 43 and the bottom surface portion 52a of the pedestal portion 52, and in the illustrated example, between the pedestal recess 57 and the bottom surface portions 57a and 52a of the pedestal portion 52. Is located in. The second sensor 55 is arranged between the side surface portion 43b of the main body recess 43 and the side surface portion 52b of the pedestal portion 52, and in the illustrated example, between the pedestal recess 57 and the side surface portions 57b and 52b of the pedestal portion 52. Is located in. The first sensor 54 and the second sensor 55 are so-called sensor elements formed by a thin film sensor that detects a load (pressure) in all directions. The first sensor 54 and the second sensor 55 are provided on the overhanging table 59 of the bottom surface portion 52a or the side surface portion 52b of the pedestal portion 52. The first sensor 54 and the second sensor 55 are vapor-deposited over the entire surface of the overhanging table 59. The surface pressure acting on the first sensor 54 and the second sensor 55 in a no-load state can be obtained from the total value of the first surface pressure and the second surface pressure, for example, 13.3 MPa. It can be set to 86.7 MPa.

As shown in FIG. 9, the calculation unit 56 calculates the radial load and the axial load based on the detection results of the first sensor 54 and the second sensor 55. In the present embodiment, the calculation unit 56 calculates the radial load based on the detection result of the first sensor 54, and calculates the axial load based on the detection results of the first sensor 54 and the second sensor 55. The calculation unit 56 is configured by using, for example, an information processing device capable of communicating. The calculation unit 56 includes a CPU (Central Processor Unit) connected by a bus, a memory, and an auxiliary storage device. The calculation unit 56 operates by executing a dedicated program.
The calculation unit 56 is arranged outside the first bearing chock 41a. The calculation unit 56 is connected to each of the first sensor 54 and the second sensor 55 via a lead wire 56a. The lead wire 56a is arranged in the lead groove 58.

Next, a method of attaching the sensor unit 50 to the bearing chock 41 will be described.
First, the pedestal portion 52 is assembled to the holder 51. At this time, the pedestal portion 52 is fitted into the pedestal recess 57 in a state where the temperature of the holder 51 is raised (for example, in a state where the temperature is raised by about 200 K). After that, the holder 51 and the pedestal portion 52 assembled to the holder 51 are fitted into the main body recess 43 in a state of being integrally cooled (for example, in a state of being cooled by about 200 K).
As a result, the sensor unit 50 is attached to the bearing chock 41.

Next, a load measuring method using the load measuring unit 30 will be described.
As shown in FIGS. 10 to 13, in the sensor unit 50, the first sensor 54 is located between the bottom surface portion 43a of the main body recess 43 and the bottom surface portion 52a of the pedestal portion 52 (in the illustrated example, the pedestal recess 57 and the pedestal recess 57). Since it is arranged between the bottom surface portions 57a and 52a of the pedestal portion 52), the first sensor 54 can measure the stress generated on the bottom surface portion 52a of the pedestal portion 52. Further, the second sensor 55 is located between the side surface portion 43b of the main body recess 43 and the side surface portion 52b of the pedestal portion 52 (in the illustrated example, between the pedestal recess 57 and the side surface portions 57b and 52b of the pedestal portion 52). The second sensor 55 can measure the stress generated on the side surface portion 52b of the pedestal portion 52. In this embodiment, the holder 51 is fitted in the main body recess 43, and the pedestal portion 52 is fitted in the pedestal recess 57. As a result, sufficient preload can be applied to the side surface portion 52b (second sensor 55) of the pedestal portion 52. As a result, the second sensor 55 can measure the stress generated on the side surface portion 52b of the pedestal portion 52 with high accuracy.
By the way, in this load measuring unit 30, as shown in FIGS. 10 and 11, when a radial load is applied from the roll 20 to the bearing chock 41, the pedestal portion 52 is pressed in the radial direction R (radial direction), and the pedestal is pressed. The bottom surface portion 52a of the portion 52 is pressed against the bottom surface portion 57a of the pedestal recess 57. As a result, a vertical stress in the radial direction R (normal force from the bottom surface portion 57a of the pedestal recess 57 toward the bottom surface portion 52a of the pedestal portion 52) is generated on the bottom surface portion 52a of the pedestal portion 52. At this time, the pedestal portion 52 is pressed against the bottom surface portion 57a of the pedestal recess 57 and widens in the circumferential direction C while being compressed in the radial direction R (see FIG. 11), and the side surface portion 52b of the pedestal portion 52 is the pedestal recess. It is pressed against the side surface portion 57b of 57. As a result, a normal stress in the circumferential direction C (normal force from the side surface portion 57b of the pedestal recess 57 toward the side surface portion 52b of the pedestal portion 52) is also generated on the side surface portion 52b of the pedestal portion 52.

As shown in FIGS. 12 and 13, when an axial load is applied from the roll 20 to the bearing chuck 41, the bottom surface portion 52a of the pedestal portion 52 is held by the bottom surface portion 57a of the pedestal recess 57, and the pedestal portion 52 The top surface portion 52c is displaced in the axial direction X (axial direction) of the fitting hole 42, and the pedestal portion 52 is sheared and deformed in the axial direction X (see FIG. 13). As a result, shear stress is generated in the side surface portion 52b of the pedestal portion 52, and the normal stress of the side surface portion 52b is reduced. At this time, the stress generated on the bottom surface portion 52a of the pedestal portion 52 due to the axial load is small.

That is, when a radial load and an axial load are applied from the roll 20 to the bearing chock 41, normal stress mainly caused by the radial load is generated on the bottom surface portion 52a of the pedestal portion 52. Therefore, it can be said that the detection result of the first sensor 54 representing the stress generated on the bottom surface portion 52a of the pedestal portion 52 has a correlation with the radial load. Therefore, by obtaining the relational expression expressing this correlation in advance, the radial load can be calculated based on the detection result of the first sensor 54 (for a specific example of the calculation method, a verification step described later may be performed. reference).

Further, when a radial load and an axial load are applied from the roll 20 to the bearing chock 41, normal stress due to the radial load and shear stress due to the axial load are applied to the side surface portion 52b of the pedestal portion 52. Mainly occurs. Therefore, it can be said that the detection result of the second sensor 55 representing the stress generated on the side surface portion 52b of the pedestal portion 52 has a correlation between the radial load and the axial load. Here, as described above, since the radial load has a correlation with the detection result of the first sensor 54 (stress generated in the bottom surface portion 52a of the pedestal portion 52), the axial load is the first and first. It can be said that there is a correlation with the detection results of the sensors 54 and 55 of 2. Therefore, by obtaining the relational expression expressing this correlation in advance, the axial load can be calculated based on the detection results of the first and second sensors 54 and 55 (for a specific example of the calculation method, refer to the calculation method). See the verification process below).

From the above, the radial load can be calculated based on the detection result of the first sensor 54, and the axial load can be calculated based on the detection results of the first and second sensors 54 and 55. When the radial load is calculated before calculating the axial load, the calculation result of the radial load obtained by converting the detection result of the first sensor 54 when calculating the axial load and the calculation result of the radial load of the second sensor 55 The axial load can also be calculated based on the detection result (see the verification step described later for a specific example of the calculation method). In the present embodiment, the calculation unit 56 first calculates the radial load based on the detection result of the first sensor 54 (first calculation step), and then the calculation result of the radial load and the second sensor 55. The axial load is calculated based on the detection result (second calculation step).
At this time, the axial load can be calculated based on the stress generated on the side surface portion 52b of the pedestal portion 52 without directly applying the axial load to the sensor. Therefore, it is possible to allow the roll 20 to move in the axial direction X.

Next, the process of verifying the measurement result by the sensor unit 50 will be described based on the simulation result.
In this verification step, first, the detection results of the first and second sensors 54 and 55 when a radial load and an axial load are applied from the roll 20 to the bearing chock 41 are verified.

In this verification step, a simulation assuming a case where a radial load is applied from the roll 20 to the bearing chock 41 and a simulation assuming a case where an axial load is applied are carried out, respectively, and the first and second simulations are performed in each simulation. The output results (simulation results) of the sensors 54 and 55 were confirmed. FIG. 14 shows the simulation results of the outputs of the first and second sensors 54 and 55 in the simulation assuming the case where a radial load is applied. FIG. 15 shows the simulation results of the outputs of the first and second sensors 54 and 55 in the simulation assuming the case where an axial load is applied.

In FIGS. 14 and 15, the horizontal axis represents the sensor output (MPa), and the vertical axis represents the magnitude (ton) of each load. Of the two types of plots, "◇" (white diamond) is the simulation result of the output of the first sensor 54, and "■" (black square) is the simulation result of the output of the second sensor 55.
As shown in FIG. 14, when a radial load is applied from the roll 20 to the bearing chock 41, the same degree of correlation between the radial load and the sensor output is confirmed for both the first sensor 54 and the second sensor 55. Was done.
As shown in FIG. 15, when an axial load is applied from the roll 20 to the bearing chock 41, the correlation between the axial load and the sensor output of the first sensor 54 is higher than that of the second sensor 55. Was confirmed to be weak.

Next, in this verification step, the calculation results of the radial load and the axial load calculated based on the detection results of the first and second sensors 54 and 55 are verified.

Here, when calculating the radial load, a relational expression (hereinafter, referred to as “first relational expression”) representing the correlation between the radial load and the detection result of the first sensor 54 is obtained in advance. , The radial load can be calculated based on this relational expression and the detection result of the first sensor 54. In the first relational expression, for example, as shown in FIG. 16, after acquiring a plurality of detection results of the first sensor when a predetermined radial load is applied for radial loads of different sizes, the radial load is obtained. It is obtained by regression analysis with the detection result of the first sensor 54 as the independent variable as the dependent variable.

When calculating the axial load, a relational expression (hereinafter referred to as "second relational expression") representing the correlation between the axial load and the detection result of the second sensor 55 should be obtained in advance for each radial load. Then, the axial load can be calculated based on this relational expression, the radial load, and the detection result of the second sensor 55. In the second relational expression, for example, as shown in FIG. 17, a plurality of detection results of the second sensor when a predetermined radial load and axial load are applied are acquired for radial loads and axial loads of different sizes. Above, it is obtained by regression analysis with the axial load as the dependent variable and the radial load and the detection result of the second sensor 55 as the independent variables.

Therefore, in this verification step, after obtaining the first and second relational expressions in advance, a simulation assuming a case where a radial load and an axial load are applied from the roll 20 to the bearing chock 41 is performed. Then, the magnitudes of the radial load and the axial load, which are the premise of the simulation to be performed, are used as the simulation values, and the simulation values, the outputs of the first and second sensors 54 and 55 in this simulation, and the first and second sensors are used. It was compared with the calculation result calculated based on the relational expression.
The results are shown in FIGS. 16 and 17. FIG. 16 shows the relationship between the output (MPa, horizontal axis) of the first sensor 54 and the radial load (ton, vertical axis). FIG. 17 shows the relationship between the output (MPa, horizontal axis) of the second sensor 55 and the axial load (ton, vertical axis). Of the two types of plots, "◇" (white diamond) is the simulation value for each load, and "■" (black square) is the calculation result.

As shown in FIGS. 16 and 17, the simulation values and the calculation results are substantially the same for both the radial load and the axial load, and the detection results of the first sensor 54 and the second sensor 55 show. Based on this, it was confirmed that the radial load and the axial load can be calculated with high accuracy.

As described above, according to the sensor unit 50 according to the present embodiment, it is possible to measure the radial load and the axial load while allowing the roll 20 to move in the axial direction X.
Further, the pedestal portion 52 is fitted into the pedestal recess 57 of the holder 51, and the holder 51 is fitted into the main body recess 43. In this way, the pedestal portion 52 is not directly fitted to the bearing chock 41, but is fitted to the bearing chock 41 via the holder 51. Therefore, instead of directly processing the bearing chock 41, the holder 51 is appropriately processed outside the bearing chock 41 to determine the degree of fitting of the holder 51 to the main body recess 43 and the pedestal recess 57 to the pedestal portion 52. The degree of fit can be adjusted. As a result, it is possible to realize highly accurate measurement while ensuring the productivity of the load measuring unit 30.

(Second Embodiment)
Next, the load measuring unit 130 according to the second embodiment of the present invention will be described with reference to FIGS. 18 to 30.
In this embodiment, the same parts as the components in the above embodiment are designated by the same reference numerals, the description thereof will be omitted, and only the differences will be described. Further, with respect to the part corresponding to the component in the above-described embodiment, a code having a different code of 100 digits (a code having the same last two digits) is added, and a part or all of the description is omitted.

In the sensor unit 150 constituting the load measuring unit 130 according to the present embodiment, the pedestal recess 157 is not open on both sides in the axial direction X as shown in FIGS. 18 to 24. In the present embodiment, a plurality (two in the illustrated example) of the pedestal recesses 157 are arranged at intervals in the axial direction X. The plurality of pedestal recesses 157 have the same shape and the same size as each other.

As shown in FIGS. 20 to 23, the pedestal recess 157 includes a bottom surface portion 157a facing the radial direction R, a pair of side surface portions 157b facing the circumferential direction C, and a pair of end face portions 157d facing the axial direction X. Be prepared. As shown in FIG. 22, the bottom surface portion 157a includes first and second inclined surfaces 157e and 157f that form a shape recessed toward the center of the bottom surface portion 157a. The first and second inclined surfaces 157e and 157f are arranged side by side in the axial direction X (arranged along the axial direction X). The first and second inclined surfaces 157e and 157f are arranged in order from the first side Xa to the second side Xb along the axial direction X. When the pedestal recess 157 (holder 151) is viewed in cross section along the axial direction X and the radial direction R, the first inclined surface 157e of the pedestal recess 157 is formed from the first side Xa to the second side Xb along the axial direction X. The second inclined surface 157f of the pedestal recess 157 extends toward the outside of the radial direction R toward the inside of the radial direction R from the first side Xa along the axial direction X toward the inside of the second side Xb. It is extended. In the above-mentioned cross-sectional view, the bottom surface portion 157a is formed in a triangular shape (isosceles triangle shape) that is convex toward the outside in the radial direction R. The angle of the triangular apex angle (the angle between the first and second inclined surfaces 157e and 157f in the above-mentioned cross-sectional view) is, for example, about 100 degrees to 150 degrees.

Further, in the present embodiment, the drawer groove 158 is formed on the side surface portion 151b of the holder 151 as shown in FIGS. 21, 23 and 24. As shown in FIG. 23, the drawer groove 158 opens in the side surface portion 157b of the pedestal recess 157, and the inside of the drawer groove 158 communicates with the inside of the pedestal recess 157.

Further, in the present embodiment, as shown in FIGS. 25 to 28, the pedestal portion 152 includes a bottom surface portion 152a and a top surface portion 152c facing the radial direction R, a pair of side surface portions 152b facing the circumferential direction C, and an axial direction X. It is provided with a pair of end face portions 152d facing the above. As shown in FIGS. 25 and 28, the bottom surface portion 152a includes third and fourth inclined surfaces 152e and 152f that form a shape that is convex toward the center of the bottom surface portion 152a. The third and fourth inclined surfaces 152e and 152f are arranged side by side in the axial direction X, and are arranged to face the first and second inclined surfaces 157e and 157f of the pedestal recess 157. The third and fourth inclined surfaces 152e and 152f are arranged in order from the first side Xa to the second side Xb along the axial direction X. When the pedestal portion 152 is cross-sectionally viewed along the axial direction X and the radial direction R (when the pedestal portion 152 is viewed from the front from the circumferential direction C), the third inclined surface 152e of the pedestal portion 152 is the axial direction X. The fourth inclined surface 152f of the pedestal portion 152 extends outward in the radial direction R from the first side Xa along the axis toward the second side Xb, and the fourth inclined surface 152f along the axial direction X is from the first side Xa to the second side Xb. It extends inward in the radial direction R toward the direction of. In the above-mentioned cross-sectional view, the bottom surface portion 152a is formed in a triangular shape (isosceles triangle shape) that is convex toward the outside in the radial direction R, and the pedestal portion 152 is formed in a pentagonal shape as a whole. The triangular apex angle α3 (the angle between the third and fourth inclined surfaces 152e and 152f in the above-mentioned cross-sectional view; hereinafter referred to as the apex angle α3 of the pedestal portion 152) is, for example, 100. It is about 150 to 150 degrees.

In the present embodiment, the first sensor 154 is arranged between the first inclined surface 157e of the pedestal recess 157 and the third inclined surface 152e of the pedestal portion 152. The second sensor 155 is arranged between the second inclined surface 157f of the pedestal recess 157 and the fourth inclined surface 152f of the pedestal portion 152. The first sensor 154 and the second sensor 155 are so-called sensor elements formed by a thin film sensor that detects a load (pressure) in all directions. The first sensor 154 and the second sensor 155 are vapor-deposited on the third and fourth inclined surfaces 152e and 152f of the pedestal portion 152. As shown in FIGS. 26 to 28, a plurality of first sensors 154 and second sensors 155 are provided on the third and fourth inclined surfaces 152e and 152f of the pedestal portion 152 at intervals in the circumferential direction C. Has been done. When a plurality of first sensors 154 are provided as in the present embodiment, for example, a sensor 154 that mainly uses a part of the plurality of first sensors 154 and the rest as a spare sensor 154 may be used. Often, the average of the detection results of each of the plurality of first sensors 154 may be used as the detection result of the first sensor 154. The same applies to the second sensor 155.

In this embodiment, the holder 151 as shown in FIG. 19 may not be fitted in the recess 43 of the main body. For example, in a state where the holder 151 is arranged with respect to the main body recess 43, by arranging other members on both sides (Xa side, Xb side) of the main body recess 43, the movement of the holder 151 in the axial direction X is restricted. May be. In this case, when the holder 151 tries to move in the axial direction X, the holder 151 abuts on the other member, so that the movement of the holder 151 is restricted. Further, for example, the holder 151 and the bearing chock 41 may be integrally screwed in a state where the holder 151 is arranged with respect to the recess 43 of the main body.
Further, in the present embodiment, the pedestal portion 152 is arranged in the pedestal recess 157, but is not fitted in the pedestal recess 157, and is, for example, loosely fitted. In other words, a gap is provided between the side surface portions 152b and 157b of the pedestal portion 152 and the pedestal recess 157, and between the end surface portions 152d and 157d of the pedestal portion 152 and the pedestal recess 157. When an axial load is applied to the bearing chock 41 from the roll 20 (see FIG. 1), the pedestal portion 152 tends to move in the axial direction X (axial direction) in the pedestal recess 157. However, this movement is caused by the abutting of the first inclined surface 157e of the pedestal recess 157 and the first sensor 154 of the pedestal portion 152, or the second inclined surface 157f of the pedestal recess 157 and the second of the pedestal portion 152. It is regulated by the contact with the sensor 155 of. When an axial load from the roll 20 to the bearing chock 41 from the first side Xa to the second side Xb in the axial direction X is applied, the second inclined surface 157f of the pedestal recess 157 and the second sensor of the pedestal portion 152 are loaded. It hits 155. When an axial load from the roll 20 to the bearing chock 41 from the second side Xb in the axial direction X toward the first side Xa is applied, the first inclined surface 157e of the pedestal recess 157 and the first sensor of the pedestal portion 152 154 hits.
When the pedestal portion 152 is not fitted in the pedestal recess 157 in this way, the load of the pre-surface pressure becomes unnecessary, and for example, the load measuring unit 130 can be easily installed. Even in this case, when the radial load is applied from the roll 20 to the bearing chock 41, the radial load from the roll 20 is applied to the holder 151 via the pedestal portion 152. At this time, the first inclined surface 157e of the pedestal recess 157 and the first sensor 154 of the pedestal portion 152 abut, and the second inclined surface 157f of the pedestal recess 157 and the second sensor 155 of the pedestal portion 152 Hits.

Next, a load measuring method using the load measuring unit 130 will be described.
As shown in FIG. 25, in the present embodiment, the first sensor 154 is arranged between the first inclined surface 157e of the pedestal recess 157 and the third inclined surface 152e of the pedestal portion 152. The sensor 154 of 1 can measure the stress generated on the third inclined surface 152e of the pedestal portion 152. Further, since the second sensor 155 is arranged between the second inclined surface 157f of the pedestal recess 157 and the fourth inclined surface 152f of the pedestal portion 152, the second sensor 155 is the pedestal portion 152. The stress generated on the fourth inclined surface 152f can be measured.

By the way, as shown in FIG. 29, in this load measuring unit 130, when a radial load (arrow F shown in FIG. 29) is applied from the roll 20 to the bearing chock 41, the pedestal portion 152 is radially R (radial direction). A vertical stress is generated on the third and fourth inclined surfaces 152e and 152f of the pedestal portion 152.
As shown in FIG. 30, when an axial load (arrow W shown in FIG. 30) is applied from the roll 20 to the bearing chock 41, the axial load is transferred from the first side Xa along the axial direction X (axial direction). When the load is directed toward the second side Xb, the fourth inclined surface 152f of the pedestal portion 152 is pressed against the second inclined surface 157f of the pedestal recess 157, and normal stress is generated on the fourth inclined surface 152f of the pedestal portion 152. When the axial load is a load from the second side Xb toward the first side Xa along the axial direction X (axial direction), the third inclined surface 152e of the pedestal portion 152 is the first inclined surface 157e of the pedestal recess 157. A vertical stress is generated on the third inclined surface 152e of the pedestal portion 152.

That is, when a radial load and an axial load are applied from the roll 20 to the bearing chock 41, normal stress due to the radial load and the axial load is applied to the third and fourth inclined surfaces 152e and 152f of the pedestal portion 152. Occurs. Therefore, among the detection results of the first and second sensors 154 and 155 representing the stress generated on the third and fourth inclined surfaces 152e and 152f of the pedestal portion 152, the component force in the radial direction (radial component force). Can be said to have a correlation with the radial load, and it can be said that the component force in the axial direction X (axial component force) has a correlation with the axial load. Therefore, by obtaining the relational expression expressing this correlation in advance, the detection results of the first and second sensors 154 and 155 (the radial component obtained from the detection results of the first and second sensors 154 and 155). Radial loads and axial loads can be calculated based on forces and axial components). At this time, the axial load can be calculated based on the stress generated on the third and fourth inclined surfaces 152e and 152f of the pedestal portion 152 without directly applying the axial load to the sensor. That is, the sensors 154 and 155 are not arranged on both sides (Xa side and Xb side) of the axial direction X with respect to the roll 20, but the sensors 154 and 155 are arranged radially outside with respect to the roll 20. Then, the axial load can be calculated. Therefore, the axial load can be calculated without restricting the movement of the roll 20 in the axial direction X.

In order to obtain the radial component force and the axial component force from the detection results of the first and second sensors 154 and 155, as shown in FIG. 29, the pedestal portion 152 is perpendicular to the third inclined surface 152e. The first angle α1 between the direction (direction orthogonal to the third inclined surface 152e) and the load direction (radial direction R) to which the radial load is applied, and the direction perpendicular to the fourth inclined surface 152f of the pedestal portion 152. A second angle α2 between (the direction orthogonal to the fourth inclined surface 152f) and the loading direction to which the radial load is applied can be used. As shown in FIG. 30, the first angle α1 is the creepage direction (direction parallel to the third inclined surface 152e) of the third inclined surface 152e of the pedestal portion 152 and the load direction (axial direction) to which the axial load is applied. It is also the angle between X). The second angle α2 is also an angle between the creepage direction (direction parallel to the fourth inclined surface 152f) of the fourth inclined surface 152f of the pedestal portion 152 and the load direction to which the axial load is applied. The first angle α1 has a third reference line L (parallel to the top surface portion 152c) extending in the axial direction X when the pedestal portion 152 is viewed in cross section along the axial direction X and the radial direction R of the fitting hole 42. It is also the angle formed with respect to the inclined surface 152e. The second angle α2 is also an angle formed by the reference line L with respect to the fourth inclined surface 152f when viewed in cross section. In the examples shown in FIGS. 29 and 30, the first angle α1 and the second angle α2 both have a common angle θ. Further, the total of the first angle α1, the second angle α2, and the angle α3 of the apex angle of the pedestal portion 152 is 180 °.

As shown in FIG. 29, assuming that a radial load F is applied from the roll 20 to the bearing chock 41, the radial load F detects the angle θ, the detection result σ1 of the first sensor 154, and the detection of the second sensor 155. Using the result σ2, for example, it can be calculated by the following equation (1).
F = α ・ (σ1 + σ2) / (2cos (θ)) ・ ・ ・ (1)
Here, α is a correlation coefficient showing the correlation between the radial load and the axial component force. The correlation coefficient α can be calculated in advance by, for example, a preliminary test or a simulation.

As shown in FIG. 30, assuming that an axial load W is applied from the roll 20 to the bearing chock 41, the axial load W is detected by the angle θ, the detection result σ1 of the first sensor 154, and the detection of the second sensor 155. Using the result σ2, for example, it can be calculated by the following equation (2).
W = β ・ (σ2-σ1) / (2sin (θ)) ・ ・ ・ (2)
Here, β is a correlation coefficient showing the correlation between the axial load and the axial component force. The correlation coefficient β can be calculated in advance by, for example, a preliminary test or a simulation. Further, in the above equation (2), the force in the axial direction X from the first side Xa to the second side Xb is positive, and the force in the direction from the second side Xb to the first side Xa is negative.

By the way, in the load measuring unit 30 according to the first embodiment as shown in FIG. 3, the pedestal portion 52 is arranged in the pedestal recess 57 and is fixed by a squeeze fit. The sensors 54 and 55 are arranged between the bottom surface portion 52a of the pedestal portion 52 and the bottom surface portion 57a of the pedestal recess 57, and between the side surface portion 52b of the pedestal portion 52 and the side surface portion 52b of the pedestal recess 57.
Here, in the load measuring unit 30 according to the first embodiment, since the second sensor 55 detects the shear stress generated on the side surface portion 52b of the pedestal portion 52, the second sensor 55 is driven (detectable). It is necessary to apply a preload to the second sensor 55 and press it in advance (crush it) in order to keep it in such a state. When measuring the load, the second sensor 55 is basically not pressed (not crushed), so the second sensor 55 is intentionally pressed by squeezing the pedestal portion 52 into the pedestal recess 57. By applying a load to the second sensor 55, the second sensor 55 is activated (made in a detectable state).
In the case of tight fitting, for example, so-called shrink fitting may be performed in which the pedestal portion 52 is fitted into the pedestal recess 57 in a state where the holder 51 is heated. At this time, heat is transferred from the holder 51 to the sensors 54 and 55, which may damage the sensors 54 and 55, making it impossible to accurately measure the load.

On the other hand, in the load measuring unit 130 according to the second embodiment as shown in FIG. 19, the pedestal portion 152 is arranged in the pedestal recess 157 and fixed by loose fitting. Each sensor 154 and 155 is used between the first inclined surface 157e of the pedestal recess 157 and the third inclined surface 152e of the pedestal portion 152, and the second inclined surface 157f of the pedestal recess 157 and the fourth of the pedestal portion 152. It is arranged between the inclined surface 152f and the inclined surface 152f. Here, both inclined surfaces 157e and 157f of the pedestal recess 157 are arranged side by side in the axial direction X, and both inclined surfaces 152e and 152f of the pedestal portion 152 are also arranged side by side in the axial direction X. Therefore, for example, even when an axial load is applied to the pedestal portion 152, the sensors 154 and 155 are pressed (crushed) by the relative movement of the pedestal portion 152 and the holder 151. As a result, the sensors 154 and 155 can be driven without preloading the sensors 154 and 155. Therefore, it is not necessary to carry out shrink fitting, and damage to each of the sensors 154 and 155 can be suppressed.

(First modification)
By the way, the holder of the present embodiment may be formed by one component as in the holder 151 shown in FIG. 22, or a plurality of components may be combined as in the holder 251 according to the first modification shown in FIG. 31. It may be formed. The holder 251 includes a main body component 72 and an auxiliary component 73. A recess 74 is formed in the main body component 72. By arranging the auxiliary component 73 in the recess 74, the recess 74 forms the pedestal recess 157. A pair of auxiliary parts 73 are arranged in the axial direction X. The pair of auxiliary parts 73 form a first inclined surface 57e and a second inclined surface 57f of the pedestal recess 157, respectively.

(Second modification)
Further, as in the holder 351 according to the second modification shown in FIGS. 32 and 33, the sensors 154 and 155 may be provided on the first and second inclined surfaces 157e and 157f in the pedestal recess 157. .. In this case, instead of depositing the sensors 154 and 155 on the inclined surfaces 157e and 157f, for example, after forming metal foils to be the sensors 154 and 155 in advance, the metal foils are formed on the inclined surfaces 157e and 157f. It may be adhered to. Further, in this case, as shown in FIG. 34, it is not necessary to provide the sensors 154 and 155 on the third and fourth inclined surfaces 152e and 152f in the pedestal portion 352. In the holder 351 shown in FIG. 32 (and the holder 451 shown in FIG. 35 described later), the drawing groove 158 is omitted for the sake of legibility of the drawing.

(Third modification example)
Further, the shape may be changed like the holder 451 and the pedestal portion 452 constituting the load measuring unit according to the third modification shown in FIGS. 35 to 38.
In the holder 451 shown in FIGS. 35 and 36, instead of the first and second inclined surfaces 457e and 457f forming a shape in which the center of the bottom surface portion 457a of the pedestal recess 457 is recessed, the bottom surface of the pedestal recess 457 is formed. The center of the portion 457a is convex.
In the pedestal portion 452 shown in FIGS. 37 and 38, the third and fourth inclined surfaces 452e and 452f form a shape in which the center of the bottom surface portion 452a of the pedestal portion 452 is convex, instead of forming the pedestal portion 452. The center of the bottom surface portion 452a is recessed.

By the way, in the pedestal portion 152 according to the second embodiment shown in FIG. 28, the length of the radial direction R in the end face portion 152d (452d) is shorter than that in the pedestal portion 452 according to the third modification shown in FIG. 37. Therefore, when the radial R load is applied to the pedestal portion 152 shown in FIG. 28, the end face is compared with the case where the radial R load is applied to the pedestal portion 452 shown in FIG. 37. The amount of deformation of the portion 152d (452d) in the axial direction X becomes smaller. As a result, in the pedestal portion 152 shown in FIG. 28, it becomes possible to suppress the frictional force generated between the end surface portion 152d of the pedestal portion 152 and the end surface portion 157d of the pedestal recess 157, and the load applied to the pedestal portion 152 can be suppressed. Can be accurately detected by each sensor 154 and 155.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The first sensor 54, 154 and the second sensor 55, 155 do not have to be thin film sensors. For example, the first sensor 54, 154 and the second sensor 55, 155 may be strain gauges. In this case, it is preferable that the first sensor 54, 154 and the second sensor 55, 155 are arranged in the recess 60 instead of the overhanging table 59.

The calculation unit 56 may be omitted. For example, instead of the calculation unit 56, the operator may calculate the radial load and the axial load, respectively, based on the detection results of the first and second sensors 54, 55, 154, and 155.
In the above embodiment, the case of calculating both the radial load and the axial load has been described, but the present invention is not limited to this. That is, it can be naturally applied to the case where only the axial load is applied to the sensor units 50 and 150 and the case where only the axial load is calculated.
The load measuring units 30 and 130 can be applied to other than the agglomerator 10 in the pretreatment equipment of the coking plant. For example, it is also possible to apply the load measuring unit to a shaft that supports a table used in a crusher. The bearing 22 does not have to be a self-aligning roller bearing.

In addition, it is possible to appropriately replace the components in the embodiment with well-known components without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

20 rolls (supported body)
30, 130 Load measuring unit 41 Bearing chock (support)
42 Fitting hole 43 Main body recess 50, 150 Sensor unit 51, 151, 251, 351 Inclined surfaces 152f, 452f Fourth inclined surface 54, 154, 454 First sensor 55, 155, 455 Second sensor 56 Calculation unit 57 Pedestal recess 57a, 157a, 457a Bottom portion 57b, 157b, 457b Side surface portion 57e , 157e, 457e First inclined surface 57f, 157e, 457e Second inclined surface C Circumferential direction R Radial direction

Claims (12)

A support having a fitting hole into which the supported body fits, and a support
It is provided with a sensor unit that is arranged in a recess of the main body formed on the inner peripheral surface of the fitting hole and on which an axial load applied from the supported body to the support is applied.
The sensor unit is
The first sensor facing the radial direction of the fitting hole and
A second sensor facing the circumferential direction of the fitting hole and
The holder fitted in the recess of the main body and
It is provided with a pedestal portion arranged in the pedestal recess formed in the holder.
The pedestal recess is
The bottom surface of the fitting hole facing the radial direction and
It is provided with a side surface portion facing the circumferential direction of the fitting hole.
The pedestal is
The bottom surface of the fitting hole facing the radial direction and
It is provided with a side surface portion facing the circumferential direction of the fitting hole.
The first sensor is arranged between the bottom surface portion of the pedestal recess and the bottom surface portion of the pedestal portion.
The second sensor is a load measuring unit characterized in that it is arranged between a side surface portion of the pedestal recess and a side surface portion of the pedestal portion. The load measuring unit according to claim 1, wherein the first and second sensors are provided on the pedestal portion. The load measuring unit according to claim 1 or 2, wherein a radial load and an axial load applied from the supported body to the support body act on the sensor unit. It is characterized by further including a calculation unit that calculates the radial load based on the detection result of the first sensor and calculates the axial load based on the detection results of the first sensor and the second sensor. The load measuring unit according to claim 3. A load measuring method for measuring the radial load and the axial load using the load measuring unit according to claim 3 or 4.
A load measuring method comprising calculating the radial load based on the detection result of the first sensor and calculating the axial load based on the detection results of the first sensor and the second sensor. A support having a fitting hole into which the supported body fits, and a support
It is provided with a sensor unit that is arranged in a recess of the main body formed on the inner peripheral surface of the fitting hole and on which an axial load applied from the supported body to the support is applied.
The sensor unit is
The first and second sensors facing the radial direction of the fitting hole, and
The holder fitted in the recess of the main body and
It is provided with a pedestal portion arranged in the pedestal recess formed in the holder.
The pedestal recess has a bottom surface portion that faces the radial direction of the fitting hole.
The bottom surface of the pedestal recess is provided with first and second inclined surfaces.
The first and second inclined surfaces are arranged side by side in the axial direction of the fitting hole.
The pedestal portion includes a bottom surface portion that faces the radial direction of the fitting hole.
The bottom surface portion of the pedestal portion includes third and fourth inclined surfaces.
The third and fourth inclined surfaces are arranged to face the first and second inclined surfaces.
The first sensor is arranged between the first inclined surface and the third inclined surface.
The load measuring unit is characterized in that the second sensor is arranged between the second inclined surface and the fourth inclined surface. The first and second inclined surfaces form a shape in which the center of the bottom surface of the pedestal recess is recessed.
The load measuring unit according to claim 6, wherein the third and fourth inclined surfaces form a shape in which the center of the bottom surface portion of the pedestal portion is convex. The first and second inclined surfaces form a shape in which the center of the bottom surface of the pedestal recess is convex.
The load measuring unit according to claim 6, wherein the third and fourth inclined surfaces form a shape in which the center of the bottom surface of the pedestal portion is recessed. The load measuring unit according to any one of claims 6 to 8, wherein the first and second sensors are provided on the pedestal portion. The load measuring unit according to any one of claims 6 to 9, wherein a radial load applied from the supported body to the support and the axial load act on the sensor unit. Between the first angle between the direction perpendicular to the third inclined surface and the load direction to which the radial load is applied, and the direction perpendicular to the fourth inclined surface and the load direction to which the radial load is applied. 10. The load measuring unit according to claim 10, further comprising a calculation unit for calculating the radial load and the axial load based on the second angle of the above and the detection results of the first and second sensors. .. A load measuring method for measuring the radial load and the axial load using the load measuring unit according to claim 10 or 11.
Between the first angle between the direction perpendicular to the third inclined surface and the load direction to which the radial load is applied, and the direction perpendicular to the fourth inclined surface and the load direction to which the radial load is applied. A load measuring method, characterized in that the radial load and the axial load are calculated based on the second angle of the above and the detection results of the first and second sensors.

Images