WO2024111645A1

WO2024111645A1 - Axial center displacement estimation system and axial center displacement estimation method

Info

Publication number: WO2024111645A1
Application number: PCT/JP2023/042053
Authority: WO
Inventors: 拓折出; 洋介友光; 知也縄田; 翔岡部
Original assignee: Ｕｂｅマシナリー株式会社
Priority date: 2022-11-25
Filing date: 2023-11-22
Publication date: 2024-05-30

Abstract

The present disclosure describes a displacement estimation method in a cylinder rotating device, a displacement estimation system in a cylinder rotating device, and an axial center displacement estimation method that make it possible to accurately estimate the displacement of a cylinder.　Provided is an axial center displacement estimation system comprising: a cylinder that rotates and processes a material passing through the interior thereof; a girth gear that is provided on the outer circumference of the cylinder; a drive unit that causes the cylinder to rotate via the girth gear; and a plurality of tires that rotatably support the cylinder. The axial center displacement estimation system implements a girth gear rotation center point estimation step for estimating the coordinates of the rotation center point of the girth gear, a cylinder rotation center point estimation step for estimating the coordinates of the rotation center point of the cylinder, and a reference line setting step for setting a reference line that serves as a reference for estimating the axial center displacement in the cylinder. The reference line passes through the rotation center point of the girth gear. The displacement of the cylinder is estimated on the basis of the distance between the rotation center point of the cylinder and the reference line.

Description

Shaft core displacement amount estimation system and shaft core displacement amount estimation method

This disclosure relates to a shaft core displacement amount estimation system and a shaft core displacement amount estimation method.

Patent Documents 1 and 2 disclose an adjustment method for adjusting the position of a cylinder included in a cylinder rotation device such as a rotary kiln. The method includes measuring the position of a measurement point on the surface of the cylinder while the cylinder rotation device is in operation, calculating the amount of deviation between the position of the measurement point or the position of a center point obtained from the measurement point and a predetermined reference line, and adjusting the position of the cylinder according to the amount of deviation.

Japanese Patent Application Laid-Open No. 6-159942 JP 2013-511033 A

This disclosure relates to a displacement estimation system and a method for estimating the axis of a cylinder with high accuracy.

In order to solve the above problems, the present invention provides an axial displacement estimation system that includes a cylinder that rotates and processes material passing through it, a girth gear attached to the outer periphery of the cylinder, a drive unit that rotates the cylinder via the girth gear, and a number of tires that rotatably support the cylinder, and includes a girth gear rotation center estimation step for estimating the coordinates of the rotation center of the girth gear, a cylinder rotation center estimation step for estimating the coordinates of the rotation center of the cylinder, and a reference line setting step for setting a reference line that serves as a reference for estimating the axial displacement of the cylinder, the reference line passing through the girth gear rotation center, and estimating the displacement of the cylinder based on the distance between the rotation center of the cylinder and the reference line.

The shaft core displacement amount estimation system and shaft core displacement amount estimation method disclosed herein can accurately estimate the displacement amount of a cylindrical body.

1 is a schematic diagram of a shaft core displacement amount estimation system according to the present invention; 2 is a cross-sectional view taken along line II-II of FIG. 1. 13 is a flowchart of a shaft core displacement amount estimation. FIG. 2 is a perspective view of a cylinder (kiln). FIG. 13 is a diagram showing the measurement of a representative point as one method for estimating the kiln rotation center point. FIG. 13 is a diagram showing a method for estimating a kiln rotation center point, the method including calculating a virtual circle. FIG. 2 is a perspective view of the kiln at the girth gear portion. FIG. 8 is a diagram showing a reference line set in FIG. 7 . FIG. 2 is a radial side view of the entire kiln with reference lines.

In the following description, the same elements or elements with the same functions will be designated by the same reference numerals, and duplicate descriptions will be omitted.

Some drawings in this specification show a Cartesian coordinate system defined by the x-axis, y-axis, and z-axis. The x-axis is a horizontal axis in the direction of the kiln 10, with the end (feeding port 11) side described below being positive. The y-axis is a horizontal axis perpendicular to the x-axis, with the left side of Figure 1 and Figure 2 being positive. The z-axis is an axis extending vertically above and below the kiln 10, with the vertical upward being positive.

In this specification, unless otherwise specified, "center point" refers to the center point of rotation of the kiln 10. Therefore, the tire center point is the center point of rotation of the kiln 10 at the tire 30, and the girth gear center point is the center point of rotation of the kiln 10 at the girth gear 20.

Furthermore, in this specification, the center point of the kiln 10, the center point of the girth gear, and the center point of the tire are all estimates unless otherwise specified. In equipment such as rotary kilns, dryers, and coolers to which the technology of this specification is applied, each component also displaces from its initial state due to changes over time, so the position of the center point is identified by estimation.

EMBODIMENT 1
[overall structure]
Fig. 1 shows the overall configuration of a shaft core displacement estimation system 1, and Fig. 2 shows a radial cross-section of a cylindrical body rotation device 2. Note that Fig. 2 shows a radial cross-section of a tire 30. The shaft core displacement estimation system 1 includes the cylindrical body rotation device 2, a position detection means 3, and a controller 100.

The cylinder rotation device 2 is configured to heat-treat (e.g., bake, dry, cool, etc.) the material while rotating the cylinder 10 and passing the material through the interior of the cylinder 10. The cylinder rotation device 2 is, for example, a rotary kiln, a dryer, or a cooler. The cylinder rotation device 2 comprises the cylinder 10, a girth gear 20, a plurality of tires 30, a drive unit 40, and a plurality of support units 50. In this specification, the cylinder 10 is referred to as a kiln 10 as a representative example of the cylinder 10, unless otherwise specified.

As shown in FIG. 2, the kiln 10 has a generally cylindrical kiln shell 10a, and a refractory material 10b is provided on the inner periphery. The refractory material 10b is provided over the entire inner periphery of the kiln shell 10a, and protects the kiln shell 10a from the internal workpiece and heat.

The kiln 10 has two ends, one on the positive x-axis side, which is an inlet 11 for the material to be treated, and the other on the negative x-axis side, which is an outlet 12. The material to be treated is fed into the inlet 11, is heat-treated while moving with the rotation of the kiln 10, and is discharged from the outlet 12.

The kiln 10 is installed at a slight incline, with the inlet 11 located vertically above (above the z-axis) the outlet 12. This allows the movement of the material to be treated to be smooth. The kiln 10 may also be installed horizontally without being inclined.

[Girth gear]
The girth gear 20 is an annular gear provided on the outer periphery of the kiln 10, and transmits the driving force of the drive unit 40 to rotate the kiln 10. Only one girth gear 20 is provided in the present invention, and the entire kiln 10 is driven by this girth gear 20. Therefore, the position of the center of rotation of the kiln 10 at the girth gear 20 can be regarded as the reference for the rotation axis of the entire kiln 10.

[tire]
A plurality of tires 30 are provided, a total of four tires 30 being located at both ends and the middle of the kiln 10. The first tire 30A is located on the inlet 11 side, the second tire 30D is located on the outlet 12 side, and the third and

fourth tires

30B and 30C are located in the middle.

Each of the tires 30A-30D is an annular support member that rotatably supports the kiln 10 located on the inner circumference side. In FIG. 1, the tires 30A-30D are arranged at equal intervals, and the first and

second tires

30A and 30D are arranged at the ends of the kiln 10.

The first tire 30A is located within a specified range from the inlet 11, which is the end of the kiln. This specified range may be any range that can stably support the kiln 10, and may be within 20% of the overall length of the kiln 10, for example. Similarly, the second tire 30D is located within a specified range from the outlet 12, which is the end of the kiln 10.

[Drive part]
The driving unit 40 includes a base 41, a pair of supports 42, a pinion gear 43, and a driving source 44. The base 41 is configured to support the pair of supports 42. The pair of supports 42 are provided on the base 41 so as to face each other with the pinion gear 43 therebetween. The pair of supports 42 are configured to rotatably hold a rotation shaft 43a of the pinion gear 43.

The pinion gear 43 has a gear shape with alternating concaves and convexes in the circumferential direction, and is arranged to mesh with the girth gear 20. The pinion gear 43 is configured to transmit rotational force to the girth gear 20 by meshing with the girth gear 20. In the example of FIG. 1, the position where the pinion gear 43 and the girth gear 20 mesh is below and to the side of the kiln 10, but is not particularly limited to this.

The driving source 44 is configured to operate based on a drive signal from the controller 100 and to drive the rotation shaft 43a of the pinion gear 43 to rotate. The driving source 44 may be, for example, an electric motor. As the driving source 44 operates, the power of the driving source 44 is transmitted to the kiln 10 via the rotation shaft 43a, the pinion gear 43, and the girth gear 20, and the kiln 10 rotates around the kiln rotation center axis A that extends along the x-axis direction.

[Support part]
Each of the plurality of support parts 50 is configured to support a corresponding tire 30 among the plurality of tires 30. As illustrated in Fig. 1, the cylindrical body rotation device 2 may include support parts 50A to 50D that support the tires 30A to 30D, respectively. In this case, the support parts 50A to 50D are lined up in this order from the input port 11 toward the discharge port 12.

As illustrated in Figures 1 and 2, the support section 50 includes a base 51, a pair of supports 52, a pair of supports 53, a support roller 54, and a support roller 55. The base 51 is configured to support the pair of

supports

52, 53.

The pair of supports 52 are provided on the base 51 so as to face each other with the support roller 54 between them. The pair of supports 52 are configured to rotatably hold the rotation shaft 54a of the support roller 54. As illustrated by the arrow Ar1 in FIG. 2, the pair of supports 52 are configured so that the installation position relative to the base 51 in the y-axis direction can be adjusted by attaching and detaching a position adjustment bolt or the like (not shown).

The pair of supports 53 are provided on the base 51 so as to face each other with the support roller 55 between them. The pair of supports 53 are configured to rotatably hold the rotation shaft 55a of the support roller 55. As illustrated by the arrow Ar2 in FIG. 2, the pair of supports 53 are configured so that the installation position relative to the base 51 in the y-axis direction can be adjusted by attaching and detaching a position adjustment bolt or the like (not shown).

The

support rollers

54, 55 are configured to be in direct contact with the tire 30 and support the tire 30. Specifically, the outer circumferential surfaces of the

support rollers

54, 55 are in direct contact with the outer circumferential surface of the tire 30.

[Adjusting the kiln body position by changing the roller position]
Here, the pair of supports 52 and the pair of supports 53 are arranged in the y-axis direction with the kiln rotation central axis A between them, as illustrated in Fig. 2. That is, the tire 30 is supported by

support rollers

54, 55 on both sides of its lower part.
[0027]
<Adjustment in the z-axis direction>
Therefore, when the installation position of at least one of the pair of

supports

52, 53 is changed so that the distance between the pair of

supports

52, 53 becomes relatively small, the distance between the

support rollers

54, 55 also becomes relatively small. Therefore, the contact position of the tire 30 on the

support rollers

54, 55 moves relatively upward, and the kiln 10 is displaced relatively upward (in the positive direction of the z-axis).
[0028]
When the installation position of at least one of the pair of

supports

52, 53 is changed so that the distance between the pair of

supports

52, 53 becomes relatively large, the distance between the

support rollers

54, 55 also becomes relatively large. Therefore, the contact points of the tire 30 on the

support rollers

54, 55 move relatively downward, and the kiln 10 is displaced relatively downward (in the negative z-axis direction).
[0029]
<Adjustment in the y-axis direction>
When the installation position of at least one of the pair of

supports

52, 53 is changed so that the intermediate position of the pair of

supports

52, 53 in the y-axis direction relatively moves to the right in Fig. 2, the intermediate position of the

support rollers

54, 55 in the y-axis direction also relatively moves to the right in Fig. 2. Therefore, as the

support rollers

54, 55 move, the kiln 10 also relatively moves to the right (negative y-axis direction).
[0030]
When the installation position of at least one of the pair of

supports

52, 53 is changed so that the intermediate position of the pair of

supports

52, 53 in the y-axis direction relatively moves leftward in Fig. 2, the intermediate position of the

support rollers

54, 55 in the y-axis direction also relatively moves leftward in Fig. 2. Therefore, as the

support rollers

54, 55 move, the kiln 10 also relatively moves leftward (positive y-axis direction).
In this way, by adjusting the positions of the pair of

supports

52, 53 in the y-axis direction, the position of the kiln 10 in the up, down, left, and right directions (z-axis direction, y-axis direction) is adjusted.

[Position detection means]
The position detection means 3 (see FIG. 1) is a non-contact type position detection device that is installed in a changeable position and detects the position of the kiln outer shell 10a. Any non-contact type may be used, such as an optical type, a laser type, or a radio wave type. By moving the position detection means 3 in the x-axis direction, the position of the kiln outer shell 10a can be detected throughout the entire axial direction of the kiln 10.

Furthermore, by using the position detection means 3 while the kiln 10 is rotating, it is possible to continuously measure the position of the outer peripheral surface of the kiln shell 10a. Based on this, the center of rotation of the kiln 10 is estimated (see Figures 5 and 6).

Note that on the inner periphery side of the girth gear 20 and each tire 30A-30D, the position of the kiln casing 10a cannot be measured directly because the girth gear 20 and each tire 30A-30D are present on the outer periphery side. Therefore, the position of the kiln casing 10a in the vicinity of the girth gear 20 and each tire 30A-30D is measured, and the center of rotation of the kiln 10 at the girth gear 20 and each tire 30A-30D is estimated based on the position in this vicinity. This will be described later.

[controller]
The controller 100 is connected to the position detection means 3, processes the detected position of the kiln shell 10a, and estimates the center point of the kiln 10, the center point of the girth gear 20, and the center points of each of the tires 30A to 30D. Based on these, the amount of axial misalignment of the kiln 10 is estimated (see the flowchart in FIG. 3 described later).

[Deformation of the kiln and the central axis of rotation]
The kiln 10 deforms due to various factors, including the weight of the kiln 10 itself, the weight of the material being processed inside, heat, aging during operation, and other factors. As the kiln 10 deforms, the kiln rotation axis A also bends, and in that case the kiln 10 rotates in a bent state.

If the kiln 10 bends more and the kiln rotation axis A bends more, the non-refractory materials installed inside may peel off, and friction in the sliding parts, the girth gear 20 and the tires 30, may become excessive. Also, the farther away in the x-axis direction from each tire 30 is the location, the greater the bending and bending of the kiln rotation axis A.

Therefore, it is an important task to understand how much the kiln's rotation axis A deviates (differences) from an ideal straight line. To solve this problem, a rotation center line is set assuming that the kiln's rotation axis A is a straight line, and the difference between this rotation center line and the actual kiln rotation axis A is understood, and the amount of deviation of the kiln's rotation axis A can be understood.

However, because the tires 30, which are the support points for the kiln 10, and the girth gear 20 also displace over time and for other reasons, it is unrealistic to measure the displacement of the kiln 10 from its initial state (at the time of installation), and it is difficult to set an absolute standard for understanding the amount of displacement.

As a result of extensive research, the inventors have discovered that by acquiring the coordinates of the rotation center of the girth gear 20 and setting any straight line passing through the rotation center of the girth gear 20 as the reference line for determining the amount of deviation, it is possible to accurately estimate the amount of displacement of the kiln's rotation center axis, i.e., the amount of shaft core displacement of the kiln 10. The estimation of the amount of shaft core displacement of the kiln 10 will be described below with reference to Figures 3 to 9.

[Estimation of shaft center displacement]
In the present invention, the center point of the girth gear 20 is first estimated (see step S1 in FIG. 3), and a straight line passing through the center point of the girth gear is set as a reference line BL for determining the amount of deviation (see step S3 in FIG. 3). Next, two arbitrary points in the axial direction of the kiln 10 are taken, and the kiln rotation center points at these two points are estimated (step S2 in FIG. 3). Furthermore, the distance between the two rotation centers and the reference line BL is calculated (step S4 in FIG. 3), and the difference between these distances is estimated as the relative deviation between the two points (step S5 in FIG. 3).

Below, as an example of estimating the amount of deviation, we will calculate the relative amount of deviation between the first and

second tires

30A and 30D.

[Girth gear center point estimation]
(1: Measurement of the kiln shell coordinates near the girth gear)
Fig. 4 is a perspective view of the kiln 10, and Fig. 5 is a radial cross-sectional view of the kiln 10 at the first vicinity position P1. The radial cross-section of Fig. 5 is designated as N (see Figs. 4 and 7).

In FIG. 4, first and second nearby positions P1 and P2 are provided on either side of the girth gear 20 in the axial direction, both of which are equidistant from the girth gear 20 in the x-axis direction (or in the direction of the kiln rotation center axis A). The rotation center point OG of the kiln 10 at the girth gear 20 (hereinafter referred to as the girth gear center point OG) is estimated using the rotation center points OP1 and OP2 of the kiln 10 at the first and second nearby positions P1 and P2.

First, the position detection means 3 measures the coordinates of the representative point MP1 of the kiln outer shell 10a at the first nearby position P1. This measurement point MP1 can be anywhere on the kiln outer shell 10a at the first nearby position P1, and any one point is selected as the representative point.

By measuring while the kiln 10 is rotating, the coordinates of the representative point MP1 are measured over the entire circumference of the first vicinity position P1. The trajectory of this representative point MP1 becomes the outer periphery of the kiln 10 at the first vicinity position P1, and is defined as the first outer periphery L1. This first outer periphery L1 exists within the radial cross section N1 of the kiln 10 at the first vicinity position P1. The radial cross section N1 is a plane perpendicular to the rotation axis of the kiln 10 at the first outer periphery L1.

If the kiln 10 is a perfect circle, the first outer periphery L1 will also be a perfect circle. In contrast, if the kiln 10 is deformed, the first outer periphery L1 will not be a perfect circle but will be a distorted circle (see Figure 5). Therefore, the position of the representative point MP1 will also change as the kiln 10 rotates.

The average value of the coordinates indicating this changing representative point MP1 is taken and defined as measurement point MP1a. Similarly, other representative points at the first neighboring position P1 are selected as representative points MP2 and MP3, and the average values are defined as measurement points MP2a and MP3a.

As described above, the first outer periphery L1 exists within the radial cross section N1, so the representative points MP1 to MP3 and the measurement points MP1a to MP3a also exist within the radial cross section N1. Note that in this specification, the measurement points are described as three points, MP1a to MP3a, but any number of points greater than three may be used.

(2: Calculation of the first virtual circle)
A virtual circle is calculated based on the three measurement points MP1a to MP3a obtained. This virtual circle is defined as the virtual circle of the kiln 10 at the first vicinity position P1 and is called the first virtual circle C1. The center point of the obtained first virtual circle C1 is called the first virtual circle center OC1. The first virtual circle C1 and its center OC1 also exist within the radial cross section N1.

(3: Calculation of the second virtual circle)
The second virtual circle C2 is calculated in the same manner as the first virtual circle M1. The calculation method is the same as the first virtual circle C1, in that first, representative points MP4 to MP6 at the first vicinity position P1 and measurement points MP4a to MP6a which are the average values of those representative points are obtained, and the second virtual circle C2 is calculated based on the representative points. The center point of the obtained second virtual circle C2 is set as the second virtual circle center OC2. The second virtual circle C2 and the second virtual circle center OC2 are also virtual circles and their centers at the first vicinity position P1, and therefore both the second virtual circle C2 and the second virtual circle center OC2 exist within the radial cross section N1.

(4: Calculate the average of the first and second virtual circle centers, and estimate the kiln center point)
The first kiln center point OP1 at the first vicinity position P1 is determined by taking the average of the first virtual circle center OC1 and the second virtual circle center OC2. Since it is difficult to measure the actual kiln center point due to deformation of the kiln 10, the first kiln center point OP1 is estimated using the above-mentioned method.

(5. Estimation of Rotation Center Point at Second Nearby Position)
Using a similar method, the second kiln center point OP2 is estimated in the same manner as the first nearby position P1 at the second nearby position P2 (see FIG. 4) set on the negative x-axis side of the girth gear 20. In addition, it is possible to estimate the kiln center point at any point in the axial direction of the kiln 10.

The second kiln center point OP2 at the second nearby position P2, together with the representative points, measurement points, and virtual circle used to derive this OP2, exists within a radial cross section N2 (not shown because it is similar to the radial cross section N1) of the kiln 10 at the second nearby position P2. Like the radial cross section N1, this radial cross section N2 is also a plane perpendicular to the rotation axis of the kiln 10 at the second outer periphery L2.

[Estimation of girth gear center point using first and second neighboring position center points]
7 is a perspective view of the kiln 10 at the girth gear 20. The distance in the x-axis direction between the first neighboring position P1 and the girth gear 20 is T1, and the distance in the x-axis direction between the second neighboring position P2 and the girth gear 20 is T2.

Note that in Figure 7, T1 and T2 appear to have different lengths, but to simplify the explanation, we will assume that T1 = T2 below.

When the first nearby position P1 and the second nearby position P2 are equidistant from the girth gear 20, the coordinates of the girth gear center point OG are the midpoint between the center point OP1 at the first nearby position P1 and the center point OP2 at the second nearby position P2. This allows the position of the girth gear center point OG to be estimated based on the first and second nearby position center points OP1 and OP2 (see step S1 in Figure 3). Alternatively, the girth gear center point OG may be the intersection of the straight line connecting the first and second nearby position center points OP1 and OP2 with the girth gear 20.

The intersection here refers to the intersection of a plane Ng that is perpendicular to the rotation axis of the kiln 10 at the center position of the girth gear 20 in the x-axis direction and a line segment connecting OP1 and OP2 (see Figures 8 and 9). However, this plane Ng may be translated in the axial direction of the kiln 10 within a range that includes the girth gear 20.

If the distances T1, T2 of the first and second proximal positions P1, P2 relative to the girth gear 20 are not equidistant, the position of the girth gear center point OG may be estimated based on the ratio of T1, T2 instead of the midpoint, or the intersection of the straight line connecting OP1, OP2 and the girth gear 20 using the plane Ng may be taken as OG.

In the above example, the first and second nearby positions P1, P2 are provided on both axial sides of the girth gear 20, but they may be provided on only one axial side. For example, in addition to the first nearby position P1, the second nearby position P2 may also be provided on the positive x-axis side of the girth gear 20 (the inlet 11 side) and the ratio of the distances T1, T2 may be used, or the intersection of the extensions of the first and second center points OP1, OP2 and the girth gear 20 may be regarded as the girth gear center point OG and estimated.

[Tire center point estimation]
Next, the tire center points are estimated. Here, the center points OT1, OT2 of the first and

second tires

30A, 30D provided at both ends of the kiln 10 are estimated (see step S2 in FIG. 3).

As with the girth gear 20, the kiln outer shell 10a is not exposed on the first and

second tires

30A, 30D, so the kiln center point is estimated on the kiln outer shell 10a on both axial sides (or only one side) of the tire 30, and the first and second tire center points OA, OD are estimated based on this.

[Setting of Reference Line BL]
Fig. 8 shows an example in which a reference line BL is set in Fig. 7. Fig. 9 is a radial side view of the entire kiln 10 with the reference line BL drawn thereon.

Following the estimation of the tire center point as described above, a reference line BL is set as a reference for grasping the amount of deviation (see step S3 in FIG. 3). This reference line BL passes through the rotation center point OG of the kiln 10 at the girth gear 20 (hereinafter, girth gear center point OG). This is because the girth gear 20 is the starting point of rotation in the kiln 10, and the girth gear center point OG can be regarded as the reference for the rotation axis of the entire kiln 10.

The reference line BL can be any line that passes through the girth gear center point OG (except for lines perpendicular to the kiln 10). Regardless of the straight line selected as the reference line BL, it is possible to accurately grasp the relative deviation of multiple kiln center points. Details will be given below.

[Estimation of deviation amount]
(Calculation of distance between reference line BL and center point of kiln)
For example, a specific reference line BL is set, and a first tire distance α, which is the distance between the reference line BL and the first tire center point OT1, is calculated (see step S4 in FIG. 3).
Here, the first tire distance α is not the shortest distance between the reference line BL and the first tire center point OT1, but the distance in a plane NT1 including the first tire 30A. Strictly speaking, the plane NT1 passes through the first tire center point OT1 and is perpendicular to the rotation axis of the kiln 10 at this center point OT1. However, the plane NT1 may be translated in the axial direction of the kiln 10 within a range including the first tire 30A.

Similarly, the second tire distance β, which is the distance between the reference line BL and the second tire center point OT2, is calculated (see step S4 in FIG. 3). Here again, β is the distance within the plane NT2 that includes the second tire 30D.

(Calculation of relative deviation amount and estimation of deviation amount)
The relative difference between the calculated first tire distance α and the second tire distance β is the relative deviation between the first and

second tires

30A, 30D (see step S5 in FIG. 3). In this way, by setting the reference line BL and determining the relative deviation between any two points in the axial direction of the kiln 10, it is possible to estimate the deformation of the kiln rotation axis A. Therefore, by changing the positions of the tires 30A to 30D to minimize the relative deviation, the kiln rotation axis A is brought closer to a straight line.

In the present invention, a straight line passing through the center point OG of the girth gear 20 is used as the reference line BL. Since the kiln 10 is rotationally driven by the girth gear 20, the center point OG of the girth gear 20 can be regarded as the reference point for displacement for a cylindrical rotating device such as the kiln 10.

In this invention, therefore, by using a straight line passing through the center point OG of the girth gear 20 as the reference line BL, it is possible to grasp the amount of adjustment for the kiln axis misalignment by the tires 30A-30D while taking into account the meshing of this girth gear 20.

[Flow of estimating shaft core displacement: Figure 3]
3 is a flow chart showing the process for estimating the amount of shaft core displacement according to the present invention. Each step will be described below.

(Step S1)
In step S1, the girth gear center point OG is estimated. As described above, the rotation center points OP1, OP2 at the first and second nearby positions P1, P2 are estimated using the position detection means 3. The girth gear center point OG is estimated based on the estimated first and second nearby position rotation center points OP1, OP2.

(Step S2)
In step S2, the first and second tire center points OT1 and OT2 are estimated using a method similar to that used for estimating the girth gear center point OG.

(Step S3)
In step S3, a reference line BL is set. The reference line BL may be a straight line passing through the rotation center point OG of the girth gear 20, and is not particularly limited.

(Step S4)
In step S4, a first tire distance α and a second tire distance β are calculated, which are distances between the reference line BL and the first and second tire center points OT1 and OT2. The first and second tire distances α and β are distances within planes NT1 and NT2 that include the first and

second tires

30A and 30D, respectively.

(Step S5)
In step S5, the difference between the first tire distance α and the second tire distance β is calculated, and this difference is estimated as the amount of relative deviation between the first and

second tires

30A, 30D.

[effect]
The effects of the present invention are as follows.

(1) A shaft core displacement estimation system including a kiln 10 (cylinder 10) that rotates and processes materials passing through it, a girth gear 20 provided on the outer periphery of the kiln 10, a drive unit 40 that rotates the kiln 10 via the girth gear 20, and a number of tires 30 that rotatably support the kiln 10, the system includes a girth gear rotation center point estimation step (step S1) for estimating the coordinates of the girth gear rotation center point OG, a kiln rotation center point estimation step (step S2) for estimating the coordinates of the kiln 10's rotation center point (e.g., first and second tire center points OT1 and OT2), and a reference line setting step (step S3) for setting a reference line BL that serves as a reference for estimating the shaft core displacement in the kiln 10, the reference line BL passing through the girth gear rotation center point OG, and the displacement of the kiln 10 is estimated based on the distance between the kiln 10's rotation center point and the reference line BL.

If the kiln 10 (cylinder 10) is not an ideal straight line and the axis is misaligned relative to the center, the misalignment can be adjusted by moving the support point (tire 30) of the kiln 10. However, because the girth gear 20 meshes with the surrounding pinion gears, moving the girth gear 20 is cumbersome and undesirable. It is particularly difficult to move the girth gear position while the kiln 10 is in operation.

Therefore, by using the straight line passing through the center of rotation of the girth gear as the reference line BL of the kiln 10 and determining the amount of deviation based on the distance from this reference line BL, it is possible to use the girth gear center OG as the origin for determining the amount of deviation.

The support points (tires 30) and girth gear 20 of the kiln 10 also move from their initial values at the time of installation, so it is not realistic to measure the absolute displacement from the initial value. On the other hand, since the entire coordinate system of the kiln 10 can be considered to move parallel as a whole, if a reference line BL for calculating the deviation is set and this reference line BL is also assumed to move parallel together with the kiln coordinate system, it is possible to grasp the deviation of the kiln central axis based on the relative positional relationship between this reference line BL and the estimated kiln center point (estimated based on the actually measured position of the kiln outer shell 10a).

Therefore, by setting the reference line BL for determining the deviation of the kiln 10 so that it passes through the center of the estimated girth gear, it is possible to determine the deviation of the kiln's central axis without any problems.

(2) The multiple tires 30 include a first tire 30A provided at least at one end of the kiln 10, and in the girth gear rotation center point estimation step, the longitudinal position of the girth gear 20 is identified based on the position of the first tire 30A. Generally, the tires 30 (support parts) are provided at both ends and in the middle of the kiln 10. Therefore, by identifying the position based on the distance from at least the first tire 30A provided at one end of the kiln end, the accuracy of the girth gear position estimation can be improved compared to the case where a tire 30 in the middle is used.

(3) In the kiln rotation center estimation step (step S2), the kiln rotation center is estimated at any point in the axial direction of the kiln 10. It is possible to estimate the rotation center in the radial cross section throughout the entire axial direction of the kiln 10. Therefore, it is possible to estimate the distance between the kiln rotation center and the reference line BL throughout the entire axial direction, and the amount of rotation can be grasped with high accuracy.

(4) A non-contact position detection means 3 is further provided, and the center of rotation of the tire 30 is estimated based on the center of rotation of the kiln 10 on one or both axial sides of the tire 30, and the center of rotation of the girth gear 20 is estimated based on the center of rotation of the kiln 10 on one or both axial sides of the girth gear 20.

The position detection means 3 uses a non-contact type such as a laser. Because it is a non-contact type, measurements can be easily performed even while the kiln 10 is in operation. However, at the positions corresponding to the tires 30, the tires 30 become an obstacle and the kiln casing 10a cannot be directly measured.

On the other hand, the kiln shell 10a is exposed on both axial sides of the tire 30, and the kiln center point at the exposed parts can be estimated. Also, the distance in the x-axis direction from the exposed parts to the center point of the tire 30 can be measured.

Therefore, it is possible to estimate the radial position of the tire center point based on the position of the kiln rotation center point on one or both sides of the tire 30 and the axial distance to the tire center point (e.g., the first and second tire center points OT1 and OT2). Since the position of the tire center point (axial position and estimated radial position) is thus identified, the tire rotation center point can be estimated with high accuracy without relying on direct measurement. The same is true for the girth gear center point OG.

When calculating the position of the tire center point from both axial sides, the position of the tire 30 center point can be estimated without any problem even if the two points are not equidistant axially from each tire. In other words, by determining two kiln center points on one axial side of the girth gear 20 and assuming that the girth gear center point OG is on the line connecting these two points, the center point (radial position) of the girth gear 20 can be estimated using a similarity relationship based on the axial position. This point is geometrically self-evident.

In addition, the cross-sectional shape of the kiln 10 can be determined by the non-contact position detection means 3. Based on this cross-sectional shape, the geometric center of gravity (not the mass center of gravity) of the kiln 10 can be calculated, and the vibration caused by the rotation of the kiln 10 can be grasped.

In addition, since the cross-sectional shape and center of rotation are estimated by the position detection means 3, it is possible to grasp the amount of bending, bending, and deformation of the cross-sectional shape of the kiln 10 and the central axis of rotation at any position in the axial direction (longitudinal direction or x-axis direction) of the kiln 10. Conventionally, there has been concern that an increase in the amount of axial misalignment of the kiln 10 may affect the refractory 10b near the support points (each tire 30A to 30D in this specification), but bending, bending, deformation, etc. of the kiln 10 between each tire 30 may also affect the refractory 10b. Therefore, by grasping the cross-sectional shape and center of rotation of the kiln 10 over the entire axial direction, it is possible to easily estimate the cause of defects occurring in the refractory between each tire 30.

(5) In the kiln rotation center point estimation step (step S2), center points OT1 to OT4 of the multiple tires 30A to 30D are estimated. This makes it possible to estimate center points OT1 to OT4, which are the rotation center of the kiln 10 for each tire 30A to 30D, and by taking the difference from the reference line BL, it is possible to grasp the relative deviation amount of each tire 30A to 30D. Therefore, by changing the relative position of each tire 30A to 30D, the linearity of the kiln 10 can be easily improved.

(6) A method for estimating the amount of axial displacement of a kiln 10 (cylinder 10) that rotates and processes materials passing through it, a girth gear 20 provided on the outer periphery of the kiln 10, a drive unit 40 that rotates the kiln 10 via the girth gear 20, and a number of tires 30 that rotatably support the kiln 10, in which the coordinates of the girth gear rotation center point OG are estimated (step S1), the coordinates of the rotation center point of the kiln 10 are estimated (step S2), and a reference line BL that serves as a reference for estimating the amount of axial displacement in the kiln 10 is set (step S3), and the reference line BL passes through the girth gear rotation center point OG, and the amount of displacement of the kiln 10 is estimated based on the distance between the rotation center point of the kiln 10 and the reference line BL. This provides the same effect as (1) above.

EMBODIMENT 2
[Setting the reference line for suppressing tire position change amount: α + β minimum]
Next, a second embodiment will be described. There is no particular restriction on the reference line BL in the first embodiment as long as it passes through the girth gear center point OG. In contrast, the second embodiment differs in that the reference line BL is determined based on the values of the first and second tire distances α and β, which are the distances between the reference line BL and each tire center point OT1 and OT2.

In other words, in the second embodiment, the reference line BL is set at a position where the sum of the first and second tire distances α and β is minimal. The first and

second tires

30A and 30B are both tires provided at both ends of the kiln 10, and changing their positions has a large impact on the kiln 10. Therefore, by minimizing the value of α+β, the sum of the amount of change in position of the first and

second tires

30A and 30D is kept to a minimum, and the impact of the adjustment of the axis misalignment on the sliding condition of the kiln 10 is reduced as much as possible.

Among the multiple tires 30, two of them are selected as the first tire 30A and the second tire 30D. The first tire rotation center point OT1, which is the rotation center point of the kiln 10 at the first tire 30A, and the second tire rotation center point OT2, which is the rotation center point of the kiln 10 at the second tire 30D, are calculated. The first tire distance α, which is the deviation from the reference line BL at the first tire rotation center point OT1, and the second tire distance β, which is the deviation from the reference line BL at the second tire rotation center point OT2, are calculated. The reference line BL is set at the position where the value of α+β is minimum.

When adjusting the kiln axis misalignment, the adjustment is made by changing the position of each tire 30, but if the tire position is changed significantly, the load conditions (load application state) at the support points of the kiln 10 and the contact state of the sliding parts change significantly, which may cause problems such as heat generation. Therefore, by setting the reference line BL at the position where the value of α + β is minimum, it is possible to minimize the amount of change in the tire position while ensuring the linearity of the kiln 10 as much as possible.

REFERENCE SIGNS LIST 1 Axial displacement estimation system 2 Cylinder rotation device 3 Position detection means 10 Kiln (cylinder)
20 Girth gear 30 Tire

30A First tire

30D Second tire 40 Drive unit

Claims

A cylinder that rotates and processes material passing through it;
a girth gear provided on an outer periphery of the cylindrical body;
a drive unit that rotates the cylindrical body via the girth gear;
and a plurality of tires that rotatably support the cylindrical body,
a girth gear rotation center point estimating step of estimating coordinates of a rotation center point of the girth gear;
a cylinder rotation center point estimation step of estimating coordinates of a rotation center point of the cylinder;
A reference line setting step of setting a reference line that serves as a reference for estimating an amount of axial core displacement in the cylindrical body,
The reference line passes through the girth gear rotation center point,
and estimating a displacement amount of the cylindrical body based on a distance between a rotation center point of the cylindrical body and the reference line.
2. The shaft core displacement estimation system according to claim 1,
The plurality of tires includes at least a first tire provided at one end of the cylindrical body,
the girth gear rotation center point estimating step specifies a longitudinal position of the girth gear based on a position of the first tire.
3. The shaft core displacement estimation system according to claim 1,
Among the plurality of tires, any two are a first tire and a second tire;
A first tire rotation center point which is a rotation center point of a cylindrical body of the first tire;
A second tire rotation center point which is a rotation center point of a cylindrical body of the second tire;
A first tire distance α which is a distance between the first tire rotation center point and the reference line;
A second tire distance β is calculated, the second tire distance β being the distance between the second tire rotation center point and the reference line.
The reference line is set at the position where the value of α+β is the smallest.
3. The shaft core displacement estimation system according to claim 1,
The axial core displacement estimation system, wherein the cylinder rotation center point estimating step estimates the rotation center point of the cylinder at an arbitrary point in the axial direction of the cylinder.
The shaft core displacement estimation system according to claim 4,
Further comprising a non-contact position detection means,
a rotation center point of the tire is estimated based on a rotation center point of the cylindrical body on one or both axial sides of the tire;
A shaft core displacement estimation system, characterized in that the rotation center point of the girth gear is estimated based on the rotation center points of the cylindrical body on one or both axial sides of the girth gear.
2. The shaft core displacement estimation system according to claim 1,
a rotation center of the cylinder of each of the tires is estimated in the cylinder rotation center point estimating step.
A cylinder that rotates and processes material passing through it;
a girth gear provided on an outer periphery of the cylindrical body;
A drive unit that rotates the cylindrical body via the girth gear;
and a plurality of tires rotatably supporting the cylindrical body,
Estimating the coordinates of the girth gear rotation center point;
Estimating the coordinates of the center of rotation of the cylinder;
A reference line is set as a reference for estimating an amount of axial core displacement in the cylindrical body;
The reference line passes through a rotation center point of the girth gear,
a displacement amount of the cylindrical body based on a distance between a rotation center point of the cylindrical body and the reference line,