Shaft core displacement estimation system and shaft core displacement estimation method

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

[Technical Field]

[0001] The present disclosure relates to a shaft core displacement amount estimation system and a shaft core displacement amount estimation method. [Background technology]

[0002] Patent Documents 1 and 2 disclose methods for adjusting the position of a cylinder included in a cylinder rotation device such as a rotary kiln. The methods include measuring the positions of measurement points on the surface of the cylinder while the cylinder rotation device is operating, calculating the amount of deviation between the positions of the measurement points or the position of a center point obtained from the measurement points and a predetermined reference line, and adjusting the position of the cylinder according to the amount of deviation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-159942 [Patent Document 2] Special Publication No. 2013-511033 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure relates to a displacement amount estimation system and a shaft center displacement amount estimation method that can accurately estimate the shaft center of a cylindrical body. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides an axial displacement estimation system comprising a cylinder that rotates and processes material passing through its interior, a girth gear provided on the outer periphery of the cylinder, a drive unit that rotates the cylinder via the girth gear, and a plurality of tires that rotatably support the cylinder, and the system comprises a girth gear rotation center point estimation step that estimates the coordinates of the rotation center point of the girth gear, a cylinder rotation center point estimation step that estimates the coordinates of the rotation center point of the cylinder, and a reference line setting step that sets a reference line that serves as a basis for estimating the axial displacement amount in the cylinder, the reference line passing through the girth gear rotation center point, and the displacement amount of the cylinder is estimated based on the distance between the rotation center point of the cylinder and the reference line. [Effects of the Invention]

[0006] According to the shaft core displacement amount estimation system and shaft core displacement amount estimation method according to the present disclosure, the displacement amount of a cylindrical body can be estimated with high accuracy. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram of a shaft core displacement amount estimation system according to the present invention; [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] 10 is a flowchart of a shaft core displacement amount estimation process. [Figure 4] FIG. 1 is a perspective view of a cylindrical body (kiln). [Figure 5] FIG. 10 is a diagram showing the measurement of a representative point as a method for estimating the kiln rotation center point. [Figure 6] FIG. 10 is a diagram showing a virtual circle calculation method for estimating the kiln rotation center point. [Figure 7] FIG. 1 is a perspective view of the kiln at the girth gear portion. [Figure 8] FIG. 8 is a diagram showing a reference line set in FIG. 7. [Figure 9] FIG. 1 is a radial side view of the entire kiln with reference lines. DETAILED DESCRIPTION OF THE INVENTION

[0008] In the following description, the same elements or elements having the same functions will be designated by the same reference numerals, and redundant description will be omitted.

[0009] Some drawings in this specification show an orthogonal 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, and the side of the end (feeding port 11) described below is positive. The y-axis is a horizontal axis perpendicular to the x-axis. ,figure The left side of 2 is positive. The z-axis is an axis extending in the vertical direction of the kiln 10, and the vertical upward direction is positive.

[0010] In this specification, unless otherwise specified, the term "center point" refers to the center of rotation of the kiln 10. Therefore, the tire center point is the center of rotation of the kiln 10 at the tire 30, and the girth gear center point is the center of rotation of the kiln 10 at the girth gear 20.

[0011] 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 estimated unless otherwise specified. In equipment to which the technology of this specification is applied, such as a rotary kiln, a dryer, or a cooler, each component displaces from its initial state over time, so the position of the center point is determined by estimation.

[0012] Embodiment 1 [Overall configuration] Fig. 1 shows the overall configuration of a shaft 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 displacement estimation system 1 includes the cylindrical body rotation device 2, position detection means 3, and a controller 100.

[0013] The cylindrical body rotation device 2 is configured to heat-treat (e.g., calcinate, dry, cool, etc.) a material while rotating the cylindrical body 10 and passing the material through the interior of the cylindrical body 10. The cylindrical body rotation device 2 is, for example, a rotary kiln, a dryer, or a cooler. The cylindrical body rotation device 2 includes the cylindrical body 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 cylindrical body 10 will be referred to as a kiln 10 as a representative example of the cylindrical body 10 unless otherwise specified.

[0014] 2, the kiln 10 has a generally cylindrical kiln outer 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 outer shell 10a and protects the kiln outer shell 10a from the materials to be treated and heat inside.

[0015] At both ends of the kiln 10, one end on the positive x-axis side is an inlet 11 for the material to be treated, and the other end on the negative x-axis side is an outlet 12. The material to be treated is fed through inlet 11, is heat-treated while moving as the kiln 10 rotates, and is then discharged from outlet 12.

[0016] 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 material to be treated to move smoothly. Note that the kiln 10 may also be installed horizontally without being inclined.

[0017] [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. In the present invention, only one girth gear 20 is provided, 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.

[0018] [tire] There are multiple tires 30, four in total, located at both ends and the middle of the kiln 10. The first tire 30A is on the inlet 11 side, the second tire 30D is on the outlet 12 side, and the third and fourth tires 30B and 30C are in the middle.

[0019] Each of the tires 30A to 30D is an annular support member that rotatably supports the kiln 10 provided on the inner periphery side. In Fig. 1, the tires 30A to 30D are provided at equal intervals, and the first and second tires 30A and 30D are provided at the ends of the kiln 10.

[0020] The first tire 30A is located within a predetermined range from the inlet 11, which is an end of the kiln. This predetermined range may be any range that can stably support the kiln 10, and may be, for example, within 20% of the total length of the kiln 10. Similarly, the second tire 30D is located within a predetermined range from the outlet 12, which is an end of the kiln 10.

[0021] [Drive unit] 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.

[0022] The pinion gear 43 has a gear shape with concave and convex portions arranged alternately in the circumferential direction, and is disposed so as 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 thereto.

[0023] The drive source 44 is configured to operate based on a drive signal from the controller 100 and to rotate the rotation shaft 43a of the pinion gear 43. The drive source 44 may be, for example, an electric motor. As the drive source 44 operates, the power of the drive source 44 is transmitted to the kiln 10 via the rotation shaft 43a, the pinion gear 43, and the girth gear 20, causing the kiln 10 to rotate around the kiln rotation center axis A extending along the x-axis direction.

[0024] [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 inlet 11 toward the outlet 12.

[0025] 1 and 2, the support unit 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.

[0026] The pair of supports 52 are provided on the base 51 so as to face each other with the support roller 54 therebetween. The pair of supports 52 are configured to rotatably hold the rotation shaft 54a of the support roller 54. As illustrated by arrow Ar1 in FIG. 2, the pair of supports 52 are configured so that their installation positions relative to the base 51 in the y-axis direction can be adjusted by attaching and detaching position adjustment bolts or the like (not shown).

[0027] The pair of supports 53 are provided on the base 51 so as to face each other with the support roller 55 therebetween. The pair of supports 53 are configured to rotatably hold the rotation shaft 55a of the support roller 55. As illustrated by arrow Ar2 in FIG. 2 , the pair of supports 53 are configured so that their installation positions relative to the base 51 in the y-axis direction can be adjusted by attaching and detaching position adjustment bolts or the like (not shown).

[0028] The support rollers 54 and 55 are configured to directly contact the tire 30 and support the tire 30. Specifically, the outer peripheral surfaces of the support rollers 54 and 55 are in direct contact with the outer peripheral surface of the tire 30.

[0029] [Position adjustment of the kiln body by changing the roller position] Here, as illustrated in FIG. 2, the pair of supports 52 and the pair of supports 53 are arranged with the kiln rotation center axis A therebetween in the y-axis direction. That is, the tire 30 is supported by the support rollers 54 and 55 on both sides of its lower part. 。 [Adjustment in the z-axis direction] Therefore, when the installation position of at least one of the pair of supports 52 and 53 is changed so that the separation distance between the pair of supports 52 and 53 becomes relatively small, the separation distance between the support rollers 54 and 55 also becomes relatively small. Accordingly, since the contact position of the tire 30 on the support rollers 54 and 55 moves relatively upward, the kiln 10 is displaced relatively upward (in the positive z-axis direction). 。 When the installation position of at least one of the pair of supports 52 and 53 is changed so that the separation distance between the pair of supports 52 and 53 becomes relatively large, the separation distance between the support rollers 54 and 55 also becomes relatively large. Accordingly, since the contact point of the tire 30 on the support rollers 54 and 55 moves relatively downward, the kiln 10 is displaced relatively downward (in the negative z-axis direction). 。 [Adjustment in the y-axis direction] When the installation position of at least one of the pair of supports 52 and 53 is changed so that the intermediate position of the pair of supports 52 and 53 in the y-axis direction moves relatively to the right in FIG. 2, the intermediate position of the support rollers 54 and 55 in the y-axis direction also moves relatively to the right in FIG. 2. Accordingly, as the support rollers 54 and 55 move, the kiln 10 is also displaced relatively to the right (in the negative 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 between the pair of supports 52, 53 in the y-axis direction moves relatively to the left in Figure 2, the intermediate position between the support rollers 54, 55 in the y-axis direction also moves relatively to the left in Figure 2. Therefore, as the support rollers 54, 55 move, the kiln 10 also moves relatively to the left (positive direction of the y-axis). In this way, by adjusting the positions of the pair of supports 52, 53 in the y-axis direction, the positions of the kiln 10 in the up / down / left / right directions (z-axis direction and y-axis direction) are adjusted.

[0030] [Position detection means] The position detection means 3 (see FIG. 1) is a non-contact position detection device whose installation position can be changed, and detects the position of the kiln outer shell 10a. Any non-contact type is acceptable, including optical, laser, and radio wave types. By moving this 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.

[0031] 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 rotation center point of the kiln 10 is estimated (see Figures 5 and 6).

[0032] Note that the position of the kiln outer shell 10a cannot be directly measured on the inner periphery of the girth gear 20 and each tire 30A-30D because the girth gear 20 and each tire 30A-30D are located on the outer periphery. Therefore, the positions of the kiln outer shell 10a near the girth gear 20 and each tire 30A-30D are 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 positions in this vicinity. This will be described later.

[0033] [controller] The controller 100 is connected to the position detection means 3, processes the detected position of the kiln outer 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 Figure 3 described below).

[0034] [Kiln and rotation axis deformation] 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 due to operation, and other factors. As the kiln 10 deforms, the kiln rotation axis A also bends, and in this case the kiln 10 rotates in a bent state.

[0035] If the kiln 10 bends more and the kiln rotation axis A bends more, the non-refractory materials installed inside the kiln may peel off, and friction at the sliding parts, such as the girth gears 20 and tires 30, may become excessive. Furthermore, the farther away from each tire 30 in the x-axis direction is the kiln rotation axis A bends more.

[0036] Therefore, it is important to understand how much the kiln rotation axis A deviates (differences) from an ideal straight line. To solve this problem, a rotation center line is established assuming that the kiln rotation axis A is a straight line, and the difference between this rotation center line and the actual kiln rotation axis A is determined, and the amount of deviation of the kiln rotation axis A can be determined.

[0037] However, since the tire 30, which is the support point of the kiln 10, and the girth gear 20 also displace due to aging and 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 a standard for determining the absolute amount of displacement.

[0038] Therefore, as a result of extensive research, the inventors have found that 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, by obtaining the coordinates of the rotation center point of the girth gear 20 and setting any straight line passing through the rotation center point of the girth gear 20 as a reference line for determining the amount of deviation. The estimation of the amount of shaft core displacement of the kiln 10 will be described below with reference to Figs. 3 to 9.

[0039] [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 line passing through this girth gear center point is set as the reference line BL for determining the amount of deviation (see step S3 in FIG. 3). Next, two arbitrary points are taken in the axial direction of the kiln 10, and the kiln rotation center points at those two points are estimated (step S2 in FIG. 3). Furthermore, the distances between the two rotation centers and the reference line BL are 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).

[0040] In the following, as an example of estimating the amount of deviation, it is assumed that the relative amount of deviation between the first and second tires 30A and 30D is calculated.

[0041] [Estimation of girth gear center point] (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 in Fig. 5 is designated as N (see Figs. 4 and 7).

[0042] In Figure 4, first and second nearby positions P1 and P2 are provided on both axial sides of the girth gear 20, both of which are equidistant in the x-axis direction (or in the direction of the kiln rotation center axis A) from the girth gear 20. 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.

[0043] First, the coordinates of a representative point MP1 on the kiln outer casing 10a at the first nearby position P1 are measured by the position detection means 3. This measurement point MP1 may be anywhere on the kiln outer casing 10a at the first nearby position P1, and any one point is selected as the representative point.

[0044] By measuring while the kiln 10 is rotating, the coordinates of the representative point MP1 are measured around the entire circumference of the first vicinity position P1. The locus of this representative point MP1 is the outer periphery of the kiln 10 at the first vicinity position P1 and is defined as the first outer periphery line L1. This first outer periphery line L1 exists within a 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 line L1.

[0045] If the kiln 10 is a perfect circle, the first outer circumferential line L1 will also be a perfect circle. In contrast, if the kiln 10 is deformed, the first outer circumferential line 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 change as the kiln 10 rotates.

[0046] 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.

[0047] As described above, the first outer peripheral line L1 exists within the radial cross section N1, and therefore the representative points MP1 to MP3 and measurement points MP1a to MP3a also exist within the radial cross section N1. Note that although the present specification describes the measurement points as three points, MP1a to MP3a, any number of points greater than or equal to three may be used.

[0048] (2: Calculate the first virtual circle) A virtual circle is calculated based on the obtained three measurement points MP1a to MP3a. 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.

[0049] (3: Calculate the second virtual circle) The second virtual circle C2 is calculated in the same way as the first virtual circle M1. As with the first virtual circle C1, the calculation method is to first determine representative points MP4 to MP6 at the first nearby position P1 and measurement points MP4a to MP6a, which are their average values, and then calculate the second virtual circle C2 based on this. The center point of the obtained second virtual circle C2 is defined as the second virtual circle center OC2. Since the second virtual circle C2 and the second virtual circle center OC2 are also virtual circles and their centers at the first nearby position P1, both the second virtual circle C2 and the second virtual circle center OC2 exist within the radial cross section N1.

[0050] (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 neighboring position P1 is determined by averaging the first virtual circle center OC1 and the second virtual circle center OC2. Because 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 method described above.

[0051] (5. Estimation of rotation center point at second nearest position) Using a similar method, a second kiln center point OP2 is estimated at a second nearby position P2 (see FIG. 4) set on the negative x-axis side of the girth gear 20, similar to the first nearby position P1. It is also possible to estimate the kiln center point at any point in the axial direction of the kiln 10.

[0052] The second kiln center point OP2 at the second vicinity position P2, together with the representative points, measurement points, and virtual circle used to derive this OP2, is located 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 vicinity position P2. Similar to 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 circumferential line L2.

[0053] [Estimation of girth gear center point using the center points of the first and second nearest neighboring positions] 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. distance is T2.

[0054] In FIG. 7, the lengths of T1 and T2 appear to be different, but for the sake of simplicity, the following description will be given assuming that T1=T2.

[0055] 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 FIG. 3). Alternatively, the girth gear center point OG may be the intersection of the girth gear 20 and a straight line connecting the first and second nearby position center points OP1 and OP2.

[0056] 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.

[0057] If the distances T1 and T2 of the first and second proximal positions P1 and 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 and T2 rather than the midpoint, or the intersection of the straight line connecting OP1 and OP2 with the girth gear 20 using a plane Ng may be taken as OG.

[0058] Furthermore, in the above example, the first and second vicinity 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 vicinity position P1, the second vicinity position P2 may also be provided on the x-axis positive side (the insertion port 11 side) of the girth gear 20, and the ratio of the distances T1, T2 may be used, or the intersection of the extension lines 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.

[0059] [Tire center point estimation] Next, the tire center points are estimated. Here, the center points OT1 and OT2 of the first and second tires 30A and 30D provided on both ends of the kiln 10 are estimated (see step S2 in FIG. 3).

[0060] As with the girth gear 20, the kiln outer shell 10a is not exposed in 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.

[0061] [Baseline BL Settings] 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.

[0062] Following the estimation of the tire center point as described above, a reference line BL is set as a reference for determining 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 referred to as the girth gear center point OG). This is because the girth gear 20 is the starting point of rotation for 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.

[0063] The reference line BL can be any line that passes through the girth gear center point OG (excluding lines that are 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 provided below.

[0064] [Estimation of deviation amount] (Calculation of distance between base 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 this 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 within a plane NT1 that includes 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 moved parallel to the axial direction of the kiln 10 within a range that includes the first tire 30A.

[0065] 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, β is also the distance within the plane NT2 that includes the second tire 30D.

[0066] (Calculation of relative deviation and estimation of deviation) The relative difference between the calculated first tire distance α and 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 amount of deformation of the kiln rotation center axis A. Therefore, by changing the positions of the tires 30A-30D to minimize the relative deviation, the kiln rotation center axis A is brought closer to a straight line.

[0067] 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 of a cylindrical rotating device such as the kiln 10.

[0068] Therefore, in the present invention, 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 of the kiln axis misalignment by the tires 30A to 30D while taking into account the meshing of this girth gear 20.

[0069] [Flow chart for estimating shaft core displacement: Figure 3] 3 is a flowchart showing the process for estimating the amount of shaft core displacement according to the present invention. Each step will be explained below.

[0070] (Step S1) In step S1, the girth gear center point OG is estimated. As described above, the position detection means 3 is used to estimate the rotation center points OP1 and OP2 at the first and second neighboring positions P1 and P2. At the first and second neighboring positions P1 and P2 The girth gear center point OG is estimated based on the rotation center points OP1 and OP2.

[0071] (Step S2) In step S2, the first and second tire center points OT1 and OT2 are estimated using the same method as that used to estimate the girth gear center point OG.

[0072] (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.

[0073] (Step S4) In step S4, the first tire distance α and the second tire distance β, which are the distances between the reference line BL and the first and second tire center points OT1 and OT2, are calculated. The first and second tire distances α and β are the distances within planes NT1 and NT2 that include the first and second tires 30A and 30D, respectively.

[0074] (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 relative deviation amount between the first and second tires 30A, 30D.

[0075] [effect] The effects of the present invention are as follows.

[0076] (1) A shaft center displacement estimation system comprising a kiln 10 (cylindrical body 10) that rotates and processes materials passing through the interior, 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 plurality of tires 30 that rotatably support the kiln 10, comprising a girth gear rotation center point estimation step (step S1) that estimates the coordinates of the girth gear rotation center point OG, a kiln rotation center point estimation step (step S2) that estimates the coordinates of the rotation center point of the kiln 10 (for example, first and second tire center points OT1 and OT2), and a reference line setting step (step S3) that sets a reference line BL that serves as the basis for estimating the shaft center displacement in the kiln 10, and the reference line BL passes through the girth gear rotation center point OG, and the 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.

[0077] If the kiln 10 (cylinder 10) is not ideally straight and its axis is misaligned, the misalignment can be adjusted by moving the support point (tire 30) of the kiln 10. However, because the girth gear 20 is meshed 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.

[0078] 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.

[0079] Because the support points (tires 30) and girth gears 20 of the kiln 10 also move from their initial positions at the time of installation, it is not realistic to measure absolute displacement from their initial positions. On the other hand, because the entire coordinate system of the kiln 10 can be considered to move parallel as a unit, if a reference line BL for calculating the amount of deviation is set and this reference line BL is also assumed to move parallel together with the kiln coordinate system, it is possible to determine the amount of 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).

[0080] Therefore, by setting the reference line BL for grasping the deviation amount of the kiln 10 so that it passes through the estimated girth gear center, the deviation amount of the kiln central axis can be grasped without any problems.

[0081] (2) The plurality of tires 30 includes at least a first tire 30A provided 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 determined based on the position of the first tire 30A. Generally, tires 30 (supporting portions) are provided at both ends and in the middle of the kiln 10. Therefore, by determining the position based on the distance from at least the first tire 30A provided at one end of the kiln end, the accuracy of girth gear position estimation can be improved compared to when a tire 30 in the middle is used.

[0082] (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. This makes it possible to estimate the rotation center in the radial cross section over the entire axial direction of the kiln 10. This makes it possible to estimate the distance between the kiln rotation center and the reference line BL over the entire axial direction, allowing for accurate determination of the amount of rotation.

[0083] (4) A non-contact position detection means 3 is further provided, and the rotation center point of the tire 30 is estimated based on the rotation center point of the kiln 10 on one or both axial sides of the tire 30, and the rotation center point of the girth gear 20 is estimated based on the rotation center point of the kiln 10 on one or both axial sides of the girth gear 20.

[0084] 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 taken even while the kiln 10 is in operation. However, at the positions corresponding to the tires 30, the tires 30 obstruct the measurement, making it impossible to directly measure the kiln outer shell 10a.

[0085] On the other hand, the kiln shell 10a is exposed on both axial sides of the tire 30, and the center point of the kiln 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.

[0086] Therefore, it is possible to estimate the radial position of the tire center point based on the positions of the kiln rotation center points on one or both sides of the tire 30 and the axial distance to the tire center point (e.g., 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, it is possible to accurately estimate the tire rotation center point without relying on direct measurement. The same is true for the girth gear center point OG.

[0087] 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 from each tire in the axial direction. That is, 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 is geometrically self-evident.

[0088] 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 determined.

[0089] Since the cross-sectional shape and center of rotation are estimated using the position detection means 3, it is possible to grasp the amount of deflection, 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 could affect the refractory 10b near the support points (each tire 30A to 30D in this specification). However, deflection, 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 throughout the entire axial direction, it is possible to easily estimate the cause of defects occurring in the refractory between each tire 30.

[0090] (5) In the kiln rotation center estimation step (step S2), the center points OT1 to OT4 of the tires 30A to 30D are estimated. This allows the center points OT1 to OT4, which are the rotation centers of the kiln 10 for each tire 30A to 30D, to be estimated, and by calculating the difference from the reference line BL, it becomes possible to determine the relative deviation amount of each tire 30A to 30D. Therefore, the relative positions of each tire 30A to 30D can be changed, and the linearity of the kiln 10 can be easily improved.

[0091] (6) A method for estimating the amount of shaft displacement of a kiln (10) comprising a kiln (10) (cylindrical body 10) that rotates and processes materials passing through it, a girth gear 20 attached to the outer periphery of the kiln, a drive unit 40 that rotates the kiln via the girth gear 20, and a plurality of tires 30 that rotatably support the kiln, in which the coordinates of the girth gear rotation center OG are estimated (step S1), the coordinates of the kiln's rotation center OG are estimated (step S2), and a reference line BL is set as a reference for estimating the amount of shaft displacement of the kiln (step S3). The reference line BL passes through the girth gear rotation center OG, and the amount of displacement of the kiln is estimated based on the distance between the kiln's rotation center OG and the reference line BL. This provides the same effects as those described in (1) above.

[0092] Embodiment 2 [Setting the reference line for suppressing tire position change: α+β minimum] Next, a second embodiment will be described. In the first embodiment, there are no particular limitations on the reference line BL 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 first and second tire distances α and β, which are the distances between the reference line BL and each tire center point OT1, OT2.

[0093] That is, in the second embodiment, the reference line BL is set at a position where the sum of the distances α and β between the first and second tires is minimized. The first and second tires 30A and 30B are both tires installed at both ends of the kiln 10, and changing their positions has a significant impact on the kiln 10. Therefore, by minimizing the value of α+β, the sum of the amount of change in the positions of the first and second tires 30A and 30B is minimized, thereby minimizing the impact of adjusting the axis misalignment on the sliding state of the kiln 10 as much as possible.

[0094] Of the multiple tires 30, any two are designated as the first tire 30A and the second tire 30D, and 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, and the reference line BL is set at a position where the value of α+β is smallest.

[0095] 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 will 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 tire position while ensuring the linearity of the kiln 10 as much as possible. [Explanation of symbols]

[0096] 1. Shaft displacement estimation system 2 Cylindrical rotating device 3. Position detection means 10 Kiln (cylindrical body) 20 girth gear 30 tires 30A First tire 30D second tire 40 Drive unit

Claims

1. a cylindrical body that rotates and processes material passing through it; a girth gear provided on the outer periphery of the cylindrical body; a drive unit that rotates the cylindrical body via the girth gear; a plurality of tires rotatably supporting the cylindrical body; A shaft core displacement estimation system comprising: 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 the rotation center point of the cylinder; a reference line setting step of setting a reference line that serves as a reference for estimating the amount of axial core displacement in the cylindrical body; Equipped with the reference line passes through the girth gear rotation center point, Estimating the displacement of the cylindrical body based on the distance between the rotation center point of the cylindrical body and the reference line. A shaft core displacement estimation system characterized by the above.

2. 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, In the girth gear rotation center point estimation step, a longitudinal position of the girth gear is identified based on a position of the first tire. A shaft core displacement estimation system characterized by the above.

3. 3. The shaft core displacement estimation system according to claim 1, wherein: any two of the plurality of tires are a first tire and a second tire; a first tire rotation center point that is a rotation center point of a cylindrical body of the first tire; a second tire rotation center point that is a rotation center point of a cylindrical body of the second tire; a first tire distance α that is the distance between the first tire rotation center point and the reference line; a second tire distance β which is the distance between the second tire rotation center point and the reference line; Seeking The reference line should be set at the position where the value of α+β is minimum. A shaft core displacement estimation system characterized by the above.

4. 3. The shaft core displacement estimation system according to claim 1, wherein: The cylinder rotation center point estimation step estimates a rotation center point of the cylinder at an arbitrary point in the axial direction of the cylinder. A shaft core displacement estimation system characterized by the above.

5. 5. The shaft core displacement estimation system according to claim 4, Further comprising a non-contact position detection means, The center of rotation of the tire is estimated based on the center of rotation of the cylindrical body on one or both axial sides of the tire, 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. A shaft core displacement estimation system characterized by the above.

6. 2. The shaft core displacement estimation system according to claim 1, The cylindrical body rotation center point estimation step estimates the rotation centers of the cylindrical bodies of the plurality of tires. A shaft core displacement estimation system characterized by the above.

7. a cylindrical body that rotates and processes material passing through it; a girth gear provided on the outer periphery of the cylindrical body; a drive unit that rotates the cylindrical body via the girth gear; a plurality of tires rotatably supporting the cylindrical body; A method for estimating an amount of axial displacement of a cylindrical body, comprising: 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 the amount of shaft core displacement in the cylindrical body; the reference line passes through the rotation center point of the girth gear, Estimating the displacement of the cylindrical body based on the distance between the rotation center point of the cylindrical body and the reference line. A shaft core displacement estimation method characterized by the above.

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