• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a method for detecting straightness deviations and / or deformations in a rotary kiln (1), the rotary tube (4) in the axial direction spaced races (6), which are respectively supported on rollers (7), the outer lateral surface (5 ) of the rotary tube (4), the races (6), the rollers (7) and / or the shafts (17) of the rollers (7) by means of at least one scanning device (12) are scanned without contact, so that with respect to the scanned objects three-dimensional position data 3), and the three-dimensional position data are obtained with respect to the occurrence of a deviation of the rotary kiln axis 3 from a straight line, a deviation of the rotary tube 4 from a cylindrical shape, and / or a deviation of the roller rotation axes 8 from a parallel with the rotary kiln axis 3 ) evaluated. In a device for detecting straightness deviations and / or deformations in a rotary kiln (1) at least one non-contact scanning device (12) is provided which is arranged around the outer surface (5) of the rotary tube (4), the races (6). to contact the rollers (7) and / or the shafts (17) and / or shaft end extensions of the rollers (7) contactlessly.
    公开号:AT511105A4
    申请号:T933/2011
    申请日:2011-06-27
    公开日:2012-09-15
    发明作者:Thomas Stutz
    申请人:Holcim Technology Ltd；
    IPC主号:
    专利说明:

    The invention relates to a method and a device for detecting straightness deviations and / or deformations in a rotary kiln, whose rotary tube in the axial direction spaced-apart races, which are each supported on rollers.
    Rotary kilns are furnaces for continuous processes in process engineering and are used, for example, as clinker furnaces in cement production plants. The rotary tube of such a furnace is slightly inclined in the longitudinal direction, in order to bring about with the circulation of the furnace tube, an axial transport of the material inside the furnace, from the inlet side to the outlet side. Rotary kilns used in the cement industry typically have lengths of 75 to 80 meters, but sometimes reach up to 150 meters, and have diameters of up to 6.5 meters. The rotary tube of the rotary kiln has in the axial direction spaced-apart races, which are connected to the rotary tube via fastening systems, which allow thermal expansion of the rotary tube during operation. The races are supported on rollers, which are each rotatably mounted about an axis extending in the axial direction of the rotary axis axis. Each race are usually associated with two rollers whose axes of rotation parallel to each other and which are arranged at a distance from each other. By adjusting the distance between the two respective races supporting a race, the support height and the lateral position can be adjusted, aiming to adjust the support height and lateral position for all races so that the pivot axis, i. the connection of the centers of the spanned by all races circle surfaces, over the entire length of the rotary kiln straight. • · «♦ * * * * · ·
    Straightness deviations of the rotary kiln axis, which can be caused for example due to installation tolerances, wear of races, rollers and roller bearings during operation of the furnace, lead to a dynamic bending load of the rotary kiln shell and thereby to risk of cracking and increased wear.
    Deviations in the parallelism of the rollers rotational axes with the rotary kiln axis lead on the one hand to a significant increase in the friction between the race and rollers and on the other hand to a non-uniform contact between the race and the rollers. Both increase wear and reduce service life, i. the time in which the rotary kiln can operate without interruption until the next maintenance must be performed.
    The service life of a rotary kiln is further influenced decisively by deformations of the rotary kiln shell. Such deformations, which may occur in particular due to high temperatures, have nothing to do with the above-described straightness deviations of the rotary axis, but in particular concern local deviations from the straightness of the shell or the Mantelerzeugenden and the roundness of the Mantelguerschnitts. The deformations of the rotary kiln shell have a negative impact on the refractory lining inside the rotary kiln.
    The invention now aims at providing a method and a device with which straightness deviations and / or deformations in a rotary kiln can be detected with great accuracy, so that any deviations or deformations can be recognized and remedied at an early stage in order to reduce the service life of a rotary kiln To extend rotary kiln. The detection of the straightness deviations or the deformations should be possible without interrupting the ongoing operation of the rotary kiln. Furthermore, interventions in the existing design of the respective rotary kiln should be avoided. Finally, a simple measurement of existing ovens should be possible.
    To achieve this object, according to a first aspect of the invention, a method for detecting straightness deviations and / or deformations in a rotary kiln, in particular a clinker or lime kiln cement manufacturing plant or similar, is provided, which is characterized in that the outer surface of the Rotary tube, the races, the rollers and / or the shafts of the rollers using at least one scanning scanned contactless so that with respect to the scanned objects three-dimensional position data are obtained, and that the three-dimensional position data with respect to the occurrence of a deviation of the rotary kiln axis of a straight line, a Deviation of the rotary tube from a cylindrical shape and / or a deviation of the roller rotation axes of a parallels with the rotary kiln axis are evaluated. Due to the fact that the objects are scanned without contact, it is merely necessary to ensure that the at least one scanning device can be set up next to the rotary kiln, but constructive modifications of the kiln itself are not required. Optically operating scanning devices have a high accuracy, so that even relatively small deviations or deformations can be detected. For example, it is favorable for certain rotary kilns, if deviations and deformations in the range of a few millimeters can be detected. Op- tical scanning devices usually have a certain detection angle, so that several of the above-mentioned objects can be detected simultaneously with a single scanning device.
    Due to the fact that the method according to the invention is based on the acquisition and processing of three-dimensional position data, an evaluation can be carried out with proven software-technical means, wherein in particular the processing of the position data into a three-dimensional model of the scanned objects is possible in a simple manner. The at least one scanning device can in this case operate so that it scans a plurality of points on the surface of the object to be scanned according to a predetermined pattern or raster, so that three-dimensional position data are obtained for each point. Due to the assignment of the three-dimensional position data to the corresponding point within the given pattern or grid, the three-dimensional model can be created in a simple manner and possibly displayed on a display device.
    Another advantage of the method according to the invention is that, due to the non-contact mode of operation, the scanning can preferably also take place during the operation of the rotary kiln.
    Since rotary kilns can be very long, it is usually not possible to detect the entire kiln length with a scanning device. A preferred procedure therefore provides that with the at least one scanning device, an axial portion of the rotary kiln is scanned that scans are made in a plurality of along the kiln length distributed axial sections, in each case » at least one reference point or reference object is detected, and in that the three-dimensional position data are referenced to the respective reference point or the reference object in order to obtain relative position data, and the relative position data of a plurality of axial sections are combined and evaluated together. The reference point may, for example, be a stationary object attached specifically for this purpose. Alternatively, it is also possible to dispense with own reference points and to use as reference object only the geometry of the races for the assembly of the different scans. The scans distributed along the oven length can be made with a single scanner which must be moved along the length of the oven after each scan to start a new scan at the new location. However, it is also possible to use a plurality of scanning devices, which are arranged distributed along the furnace length. The detection range of the individual samples may preferably overlap, wherein in the overlap region preferably at least one, better more of said reference points or objects are arranged, so that adjacent samples can be related to the same stationary point and evaluated together in the sequence.
    Preferably, the rotary kiln is scanned from both sides, i. the at least one scanning device is positioned on both sides of the vertical longitudinal center plane of the rotary tube passing through the axis of rotation. As a result, both of the rollers assigned to a respective raceway can be scanned.
    Straightness deviations of the rotary kiln axis are preferably detected such that when scanning the races circumferential points of the races representing three-dimensional position data are obtained, that is adapted to the perimeter points of each race computationally a circle, the center of each circle is determined, the furnace axis obtained computationally as a connection of the centers is compared, the furnace axis with a straight line and vulnerable deviations are issued.
    Deformations of the rotary kiln shell are preferably detected in such a way that, upon scanning the lateral surface of the rotary tube, three-dimensional position data representing shroud points are obtained, which are linked to rotation angle data representing the instantaneous angle of rotation of the rotary tube at the time of scanning of the respective shroud point. As a result, during normal operation, i. be scanned during rotation of the rotary tube. Advantageously, in this case the procedure is such that a three-dimensional model of the rotary tube is created from the three-dimensional position data representing the mantle points and the respectively associated rotary angle data.
    The three-dimensional model can then preferably be compared with a cylindrical comparison model, wherein local deviations of the three-dimensional model from the comparison model are displayed. Deviations can arise here in various ways. Preferably, local deviations of the cross section of the rotary tube from a circular cross section and deviations of the course of the axis of the rotary tube from a straight course are displayed separately from each other.
    Parallelism deviations of the rollers are preferably detected such that the scanning of the rollers comprises the scanning of arranged at the two ends of the roller rotation axes of reference objects, in particular reference balls. Advantageously, the procedure is such that the rotational axis of the rollers is computationally obtained as a connection of the reference objects and that the parallelism of the axis of rotation with the furnace axis is determined and deviations from the parallelism are displayed.
    Within the scope of the method according to the invention, scanning by means of 3D laser scanning is particularly preferred. Laser scanning refers to the line or raster-like sweeping of surfaces or bodies with a laser beam. In 3D laser scanning, the surface geometry of the scanned object is recorded digitally by means of pulse transit time, phase difference compared to a reference or by triangulation of laser beams. This results in a discrete set of three-dimensional sampling points, which is referred to as a point cloud. The coordinates of the measured points are determined from the angles and the distance with respect to the origin (device location). On the basis of the point cloud, either individual dimensions, such as Lengths and angles are determined or it is constructed from a closed surface of triangles (meshing or meshing) and e.g. used in 3D computer graphics for visualization.
    To solve the problem underlying the invention, a device is provided according to a second aspect of the invention, which is characterized by at least one non-contact scanning device which is arranged around the outer surface of the rotary tube, the races, the rollers and / or the waves of the rollers • • 4 • 4
    * I * * »1 * 1 ι * * k 4» * «4 * * * * * * * # · · skipless, so that three-dimensional position data are obtained with respect to the scanned objects, the three-dimensional position data being fed to a computing unit which an evaluation circuit for evaluating the three-dimensional position data regarding the occurrence of a deviation of the rotary kiln axis from a straight line, a deviation of the rotary tube from a cylindrical shape, and / or a deviation of the roller rotation axes from a parallel with the rotary kiln axis.
    Preferably, the scanning device is designed as a 3D laser scanner.
    The detection region of the at least one scanning device preferably corresponds to an axial subregion of the rotary kiln, one or a plurality of scanning devices being distributed along the furnace length, preferably at least one stationary reference point or at least one reference object being arranged in the detection region of each scanning device, and the arithmetic unit being configured, in order to refer the three-dimensional position data to the respective reference point in order to obtain relative position data and to merge and jointly evaluate the relative position data of a plurality of axial sections.
    Preferably, at least one scanning device is arranged on each side of the rotary kiln.
    Preferably, the scanning devices are directed onto the races, so that three-dimensional position data representing the raceways are obtained, the position data being fed to the arithmetic unit and the arithmetic unit having processing means for computationally fitting a circle to the peripheral points of each race, the midpoint of each circle to determine to obtain the kiln axis mathematically as the connection of the centers and to compare the kiln axis with a straight line, and wherein output means are provided, which cooperate with the arithmetic unit for outputting any deviations of the kiln axis from the straight line.
    Preferably, the at least one scanning device is directed onto the lateral surface of the rotary tube so that three-dimensional position data representing mantle points is obtained, wherein at least one rotational angle sensor is provided for detecting rotational angle data representing the instantaneous rotational angle of the rotary tube or a pulse sensor for determining the rotation of the rotary tube and the position data and the rotation angle data are supplied to the arithmetic unit, wherein the position data are associated with those rotation angle data representing the instantaneous rotation angle of the rotary tube at the time of scanning the respective jacket point.
    Processing means of the arithmetic unit are preferably designed to create a three-dimensional model of the rotary tube from the three-dimensional position data representing the mantle points and the respective associated rotary angle data.
    Preferably, the processing means is arranged to compare the three-dimensional model with a cylindrical comparison model, wherein output means are provided which cooperate with the processing means to output local deviations of the three-dimensional model from the comparison model. • * • * ** * * * »a • * · · *» ** ·· »« «« «1 * 0 '
    The at least one scanning device is preferably directed onto reference objects, in particular reference spheres, arranged at the two ends of the roller shaft.
    Processing means of the arithmetic unit are preferably designed to mathematically obtain the rotation axis of the rollers as a connection of the reference objects and to determine the parallelism of the axis of rotation with the oven axis, wherein output means are provided which cooperate with the arithmetic unit for outputting deviations from the parallelism.
    The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. In this figure Fig.l show a perspective view of a rotary kiln from the side and Fig. 2 is a detailed view of the definition of the races on the rotary kiln shell.
    In Fig.l an axial portion of a rotary kiln 1 is shown, wherein the rotary kiln 1 is supported on three stationary roller blocks 2. The rotary kiln 1 has a rotatably mounted about the axis 3 rotary tube 4, whose jacket is denoted by 5. On the jacket 5 of the rotary tube 4 in the example shown, three mutually beabstan-ended races 6 are attached via a fastening system shown in more detail in Figure 2. The drive of the rotary tube 4 is not shown for clarity. The drive is usually done via a rotatably connected to the jacket 5 of the rotary tube 4 ring gear. A drive for such a ring gear is, for example, the WO 2010/067183 Al refer to.
    Each race 6 is supported on two associated rollers 7, wherein the rollers 7 are rotatably mounted in each case about an axis of rotation 3 arranged parallel to the rotary axis.
    The axis of rotation 3 of the rotary tube 5 is defined as the axis resulting from the connection of the imaginary centers of the individual races 6. Ideally, the centers 9 of the races should be 6 on a straight line. In practice, however, there are deviations in that, as shown in Fig.l, the center of the middle race is too deep, so that the connection of the centers of the left and middle race 6 for connecting the centers of the middle and the right race. 6 include an obtuse angle. In practice, maximum deviations in the height direction and / or in the lateral direction of 3 to 10 mm from the ideal state are tolerated. Any further deviations would lead to a significant increase in the dynamic bending load of the rotary tube 4 and, associated therewith, to an increase in wear.
    In Fig.l is further apparent that the indicated with 10 axial region of the rotary tubular jacket 5 has deformations such that the jacket cross-section deviates from a circular shape. In the schematically indicated with 11 axial region of the rotary kiln, the rotary tube 4, starting from the ideal Kreiszylinderforra a deformation to the effect that the generations of the cylinder no longer straight but curved.
    In order to be able to detect the different straightness deviations and deformations in the rotary kiln with high accuracy,> »« «
    According to the invention, a 3D laser scanner 12 is set up laterally next to the rotary kiln, the detection area of which is set at 13 ° is designated. The laser scanner 12 scans within the detection area 13, the surface of the rotary tube 4 of the race 6 and the rollers 7 from. Due to the scanning, a plurality of three-dimensional position data is received within the detection area 13, which are supplied to a computing device 14. In the arithmetic unit 14, the three-dimensional position data are evaluated, the result of the evaluation being displayed on a schematically represented output device 15, such as, for example, a screen. Within the detection area 13, a stationary, fixed to the support block 2 reference object 16 is arranged, which is used in the determination of the position data as a reference point. In the present embodiment, the detection range 13 of the laser scanner 12 extends only over an axial portion of the rotary kiln 1 and therefore several measurements must be made sequentially with appropriately displaced in the axial direction laser scanner 12, wherein the respective detection areas 13 preferably overlap. Alternatively, a corresponding plurality of laser scanners 12 is used and the scanning of the rotary kiln 1 is carried out accordingly with the plurality of laser scanners 12 simultaneously. The laser scanners 12 can either be arranged only on one side of the rotary kiln or on both sides to allow a more accurate evaluation. In order to supply the measurements by a plurality of laser scanners 12 or a plurality of successively axially offset regions to a common evaluation, a reference object 16 is arranged in each of the preferably overlapping detection regions 13. I t · Ϊ 3 ·
    Apart from the reference objects 16, the scanning of the surface of the rotary tube 14 and the races 6 requires no further incorporation or conversions on the rotary kiln 1. For the detection of deviations of the axis of rotation 8 of the rollers 7 in a direction parallel to the rotary axis 3 course, it is advantageous, if at the ends of the roller shaft 17 each one detectable by the laser scanner 12 reference object 18 is arranged. The course of the axis of rotation 8 of the rollers 7 is in this case determined in the arithmetic unit 14 by the connection of the position data determined at the two reference objects 18.
    2 shows tangentially supported on the jacket 5 of the rotary tube 4 plates 19, which connect the rotary kiln 1 with the raceway 6. Due to the resilient action of the plates 19, a thermal expansion of the rotary tube 4 can be compensated in a simple manner.
    权利要求:
    Claims (24)
    [1]
    1. A method for detecting straightening deviations and / or deformations in a rotary kiln, the rotary tube in the axial direction spaced apart races, which are each supported on rollers, characterized in that the outer surface of the rotary tube, the races, the rollers and or the waves of the rollers are scanned contactlessly by means of at least one scanning device, so that three-dimensional position data are obtained with respect to the scanned objects, and that the three-dimensional position data regarding the occurrence of a deviation of the rotary kiln axis from a straight line, a deviation of the rotary tube from a cylindrical shape and / or a deviation of the roller rotation axes of a parallels with the rotary kiln axis are evaluated.
    [2]
    2. The method according to claim 1, characterized in that the scanning takes place during operation of the rotary kiln.
    [3]
    3. The method according to claim 1 or 2, characterized in that with the at least one scanning device, an axial portion of the rotary kiln is scanned that scans are made in a plurality of along the kiln length distributed axial portions in each of which a fixed reference point is included, and that the three-dimensional position data are referenced to the respective reference point to obtain relative position data, and the relative position data of a plurality of axial portions are merged and evaluated together.
    [4]
    4. The method of claim 1, 2 or 3, characterized in that the rotary kiln is scanned from both sides.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that during scanning of the races circumferential points of the races representing three-dimensional position data are obtained, that at the perimeter points of each race arithmetically a circle is adjusted, the center of each circle is determined, the furnace axis arithmetically obtained as the connection of the centers, the furnace axis is compared with a straight line and any deviations are output.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that when scanning the lateral surface of the rotary tube jackets representing three-dimensional position data are obtained, which are linked with rotation angle data representing the instantaneous angle of rotation of the rotary tube at the time of scanning the respective jacket point.
    [7]
    7. The method according to claim 6, characterized in that a three-dimensional model of the rotary tube is created from the three-dimensional position data representing the mantle points and the respective associated rotational angle data.
    [8]
    8. The method according to claim 7, characterized in that the three-dimensional model is compared with a cylindrical comparison model and that local deviations • * ·· Η »· | * »* 9 * * *» · ι «* * 1 * 6 * * * · · * * · * of the three-dimensional model are displayed by the comparison model.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that local deviations of the cross section of the rotary tube from a circular cross section and deviations of the course of the axis of the rotary tube from a straight course are displayed separately from each other.
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that the scanning of the rollers comprises the scanning of arranged at the two ends of the roller pivot axes of reference objects, in particular reference spheres.
    [11]
    11. The method according to claim 10, characterized in that the axis of rotation of the rollers is computationally obtained as a compound of the reference objects and that determines the parallelism of the axis of rotation with the furnace axis and deviations from the parallelism are displayed.
    [12]
    12. The method according to any one of claims 1 to 11, characterized in that the scanning is performed by means of 3D laser scanning.
    [13]
    13. The method according to any one of claims 1 to 12, characterized in that the rotary kiln is a clinker kiln a cement production plant or lime kiln a Kalkherstellungsanlage.
    [14]
    14. A device for detecting straightening deviations and / or deformations in a rotary kiln, the rotary tube in the axial direction spaced apart races, which are each supported on rollers, in particular for carrying out a method according to one of claims 1 to 13, characterized by at least one contactless working scanning device which is arranged to contactlessly scan the outer surface of the rotary tube, the races, the rollers and / or the shafts and / or shaft end extensions of the rollers so that three-dimensional position data are obtained with respect to the scanned objects the three-dimensional position data are supplied to a computing unit having an evaluation circuit to obtain the three-dimensional position data regarding the occurrence of a deviation of the rotary kiln axis from a straight line, a deviation of the rotary tube from a cylindrical shape and / or an A. Deviation of the roller rotation axes of a parallels with the rotary kiln axis to evaluate.
    [15]
    15. The apparatus according to claim 14, characterized in that the scanning device is designed as a 3D laser scanner.
    [16]
    16. Device according to claim 14, characterized in that the detection range of the at least one scanning device corresponds to an axial subarea of the rotary kiln, that one or a plurality of scanning devices is distributed along the furnace length, that at least one fixed reference point in the detection range of each scanning device at least one reference object is arranged, and in that the arithmetic unit is designed to refer the three-dimensional position data to the respective reference point in order to obtain relative position data and to merge and jointly evaluate the relative position data of a plurality of axial subregions.
    [17]
    17. The apparatus of claim 14, 15 or 16, characterized in that on each side of the rotary kiln at least one scanning device is arranged.
    [18]
    18. Device according to one of claims 14 to 17, characterized in that the scanning devices are directed to the races so that circumferential points of the races representing three-dimensional position data are obtained, that the position data of the arithmetic unit are supplied and that the arithmetic unit comprises processing means to the Boundary points of each race computationally adapt a circle, to determine the center of each circle, to obtain the kiln axis computationally as a connection of the centers and to compare the kiln axis with a straight line, and that output means are provided with the arithmetic unit for outputting any deviations of Oven axis from the straight line interaction.
    [19]
    19. Device according to one of claims 14 to 18, characterized in that the at least one scanning device is directed onto the lateral surface of the rotary tube, so that three-dimensional position data representing lateral points are obtained, that at least one rotational angle sensor for detecting rotational angle data representing the instantaneous rotational angle of the rotary tube or a pulse sensor for detecting the rotation of the rotary tube is provided and that the position data and the rotation angle data of the arithmetic unit are supplied, the position data are associated with those rotation angle data representing the instantaneous rotation angle of the rotary tube at the time of scanning the respective jacket point.
    [20]
    20. The apparatus of claim 19, characterized in that processing means of the arithmetic unit are formed to create a three-dimensional model of the rotary tube from the three-dimensional position data representing the mantle points and the respective associated rotational angle data.
    [21]
    Apparatus according to claim 20, characterized in that the processing means are arranged to compare the three-dimensional model with a cylindrical comparison model and that output means are provided which cooperate with the processing means to output local deviations of the three-dimensional model from the comparison model.
    [22]
    22. Device according to one of claims 14 to 21, characterized in that the at least one scanning device on arranged at the two ends of the roller shaft reference objects, in particular reference sphere ·, is directed.
    [23]
    23. The device according to claim 22, characterized in that processing means of the arithmetic unit are designed to obtain the axis of rotation of the rollers computationally as a connection of the reference objects and to determine the parallelism of the axis of rotation with the furnace axis and that output means · are provided with the arithmetic unit to output deviations from the parallelism interaction.
    [24]
    24. Device according to one of claims 14 to 23, characterized in that the rotary kiln is a clinker kiln a cement production plant or lime kiln of a Kalkherstel-lungsanlage. Vienna, June 27, 2011 Applicant by: Haffner and Keschmann Patentanwälte OG
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    公开号 | 公开日
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    PL2724103T5|2019-07-31|
    US20140134558A1|2014-05-15|
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    US9719724B2|2017-08-01|
    US20170292788A1|2017-10-12|
    EP2724103B1|2015-04-22|
    WO2013001334A1|2013-01-03|
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    法律状态:
    2017-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20160627 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA933/2011A|AT511105B1|2011-06-27|2011-06-27|METHOD AND DEVICE FOR DETECTING STRAIGHT DEVIATIONS AND / OR DEFORMATION IN A THROUGHPIECE|ATA933/2011A| AT511105B1|2011-06-27|2011-06-27|METHOD AND DEVICE FOR DETECTING STRAIGHT DEVIATIONS AND / OR DEFORMATION IN A THROUGHPIECE|
    EP12740657.7A| EP2724103B2|2011-06-27|2012-06-15|Method and device for detecting straightness deviations and/or deformations in a rotary kiln|
    PL12740657T| PL2724103T5|2011-06-27|2012-06-15|Method and device for detecting straightness deviations and/or deformations in a rotary kiln|
    DK12740657.7T| DK2724103T4|2011-06-27|2012-06-15|Method and device for detecting straightness deviations and / or deformations at a rotary kiln|
    US14/129,421| US9719724B2|2011-06-27|2012-06-15|Method and device for detecting straightness deviations and/or deformations in a rotary kiln|
    PCT/IB2012/001168| WO2013001334A1|2011-06-27|2012-06-15|Method and device for detecting straightness deviations and/or deformations in a rotary kiln|
    ARP120102293A| AR086766A1|2011-06-27|2012-06-26|PROCEDURE AND DEVICE FOR DETECTING ALIGNMENT DEVIATIONS AND / OR DEFORMATIONS IN A ROTARY TUBULAR OVEN|
    US15/630,595| US10254045B2|2011-06-27|2017-06-22|Method and device for detecting straightness deviations and/or deformations in a rotary kiln|
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