KR101871775B1 - Alignment management method of rotary kiln - Google Patents

Abstract

The present invention relates to a method of managing alignment of a rotary kiln which can monitor problems such as wear and deformation of a support roller by measuring a change in load and a strain of a support roller added to a support roller supporting the rotary kiln smoothly .
The alignment management method of a rotary kiln according to the present invention includes an alignment management step of a rotary kiln by cold measurement, an alignment management step of a rotary kiln by hot measurement, and an alignment management step of an actual rotary kiln, The alignment control step of the rotary kiln is a step of measuring a load applied to the housing of the bearing corresponding to the support roller.

Description

{ALIGNMENT MANAGEMENT METHOD OF ROTARY KILN}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of managing an alignment of a rotary kiln, and more particularly, to a method of managing an alignment of a rotary kiln by measuring a change in a load applied to a support roller And how to manage the alignment of the rotary kiln so that problems can be monitored.

Generally, as shown in Fig. 1, a rotary kiln used for a process such as heating limestone to obtain quicklime required for cement production generally comprises a cylindrical body 1, a limestone 1 at one end of the body, A preheater 6 outside the inlet 1a for preheating the limestone before the lime is put into the body and a discharge port 1b at the other end of the body for discharging the quicklime obtained by heating the limestone and an outlet 1b, And a burner 7 for heating the inside of the body from the outside. A driven gear 2 is provided at the center of the outer peripheral surface of the moving body 1 and a drive gear 5 generating a rotational force as the drive motor 4 is driven is provided at a lower side of the driven gear 2 And is gear-coupled. A plurality of tire rings 3 are provided at both ends of the outer peripheral surface of the moving body 1 and a pair of support rollers 8 are respectively in contact with both lower sides of the tire ring 3.

The rotary kiln having such a configuration charges the limestone preheated in the preheater through the inlet 1a and operates the drive motor 4 and the burner 7 provided outside the outlet 1b. When the drive motor 4 is operated, the drive gear 5 provided on the rotary shaft 4a is rotated and the driven gear 2, which is gear-coupled to the drive gear 5, And the tire ring 3 installed at both ends of the outer peripheral surface of the moving body 1 rotates in contact with the support roller 8 so that the moving body 1 smoothly rotates.

However, when a body composed of a cylindrical shell mounted around the outside of a cylindrical refractory brick is rotated by a drive motor, the body rotates in contact with the support roller, so that a metal surface It is possible to prevent the shape of the shell and the support roller from adhering to each other by supplying the protective coating agent or to prevent the wear and damage of the surface of the shell and the support roller by distributing the load,

The alignment measurement method of the rotary kiln can be roughly divided into cold and hot state measurement. In the past, the distance between the support rollers and the drive motor during kiln stop was measured based on the reference line when the rotary kiln was installed, The alignment is managed by visually observing the state and checking the alignment and relocating the support roller relative to the marked center line of the moving body to disperse the load on the support roller.

On the other hand, since the shell has a long cylindrical structure having a considerable weight, twisting occurs in the rotation by the driving motor, and therefore, there arises a problem that the refractory bricks are peeled off. To prevent such a phenomenon, Patent Application No. 1997-0014301 Discloses a method and an apparatus for measuring the rotation state of a shell and a tire ring of a rotary kiln to measure the presence or absence of torsional rotation of the shell. However, this method does not measure the load actually applied to the support roller.

An object of the present invention is to provide a method of managing alignment of a rotary kiln which can stabilize a rotary kiln by measuring load fluctuations directly applied to a support roller during rotation of a moving body and managing alignment.

The alignment management method of the rotary kiln according to the present invention

A rotary ring provided with a plurality of tires which are rotatably supported by two support rollers around the outer periphery of the shell, The method comprising:

Alignment management step of rotary kiln by cold measurement,

An alignment management step of the rotary kiln by hot measurement, and

Includes an alignment management step of the rotary kiln in actual operation,

The alignment management step of the rotary kiln in actual operation is a step of measuring the load applied to the housing of the bearing corresponding to the support roller.

And a plurality of tire rings rotatably supported by two support rollers around an outer periphery of the shell, the plurality of tire rings being rotatably supported by the drive means,

A strain gauge load cell is mounted on a lower portion of the housing of the bearing corresponding to the support roller to measure the load applied to the housing of the bearing corresponding to the support roller.

The alignment management method of the rotary kiln according to the present invention can measure the load actually applied to the support roller in real time regardless of the length of the body of the rotary kiln or the number of tire rings.

The rotary kiln alignment management method according to the present invention can detect the wear and deformation of the support roller and adjust the alignment to the optimum state.

The alignment management method of the rotary kiln according to the present invention can prevent the sudden stoppage of the rotary kiln by adjusting the alignment to the optimum state, and can prolong the life of the rotary kiln.

According to the alignment management method of the rotary kiln according to the present invention, the load actually applied to the support roller can be measured in real time, and the sintering state of the raw material heat-treated in the rotary kiln can be inferred.

1 is a view schematically showing the construction of a general rotary kiln.
2 is a view showing the distance between the outer surface of the shell of the rotary kiln measured according to the present invention and the liner of the tire ring.
Fig. 3 is a view showing a position for measuring the outer diameter of a tire ring of a rotary kiln according to the present invention. Fig.
4 is a view showing a position where a circumference of a support roller of a rotary kiln according to the present invention is measured.
5 is a view showing a gap between a drive gear and a driven gear of a rotary kiln according to the present invention.
Figs. 6 and 7 are views showing positions where the level of the tire ring of the rotary kiln is measured according to the present invention. Fig.
8 is a view showing the horizontal distance between the center of the tire ring of the rotary kiln according to the present invention and the center of two support rollers corresponding to the tire ring.
9A to 9C are views showing a method of calculating a position adjustment amount of a support roller corresponding to first to third tire rings of a rotary kiln according to an embodiment.
FIG. 10A is a graph showing a measured position of a shell displacement amount of a rotary kiln according to the present invention, FIG. 10B is a graph showing a displacement amount measured according to a longitudinal direction and a circumferential position of the shell, Fig. 6 is a distribution diagram showing eccentric deflection of the first to third tire rings. Fig.
11A and 11B are views showing a method of measuring a displacement for calculating a strain rate of a shell of a rotary kiln according to the present invention.

Hereinafter, an alignment management method of a rotary kiln according to the present invention will be described with reference to the drawings.

Alignment measurements for several mechanical components of a rotary kiln can be divided into cold and hot measurements,

By cold (cold) measurement

1-1. Check the sealing of the inlet and outlet,

1-2. Check the liner and stopper wear of the tire ring,

1-3. Checking the wear of the tire ring and the support roller,

1-4. Measurement of the amount of wear of the driven gear (gear clearance) and clearance between the driving gear (top clearance and back lash)

1-5. Checking the level and dimensions of each tire ring of the rotary kiln, and

1-6. There is a strain measurement of the shell of a rotary kiln,

As a hot measurement,

2-1. Measuring the slip amount of the shell of the rotary kiln, and

2-2. There is a measurement of the ovality of the shell of a rotary kiln, and the cold measurement and the hot measurement will be described with reference to the drawings.

1-1. Check the sealing of the inlet and outlet

Sealing of the inlet and outlet of the rotary kiln's fuselage is carried out by the naked eye of the driver. The quantity of sealing parts to be replaced due to wear, deformation and dropout is visually observed and replaced.

1-2. Check the tire ring for liner and stopper wear

Table 1 shows an example of the result of measuring the contact state of the tire ring stopper and the tire ring of the rotary kiln according to the present invention.

division The first tire ring The second tire ring The third tire ring Inlet outlet Inlet outlet Inlet outlet Cold interval (mm)
25 0 0 11 0 5

Spacing at hot (mm)
20 0 10 0 6 0

As a result of the measurement, it is found that the abrasion condition of each stopper is good but in the case of the second and third tire rings, there is a lot of left-right movement during operation, and therefore it is judged that the stopper needs to be replaced.

Table 2 shows an example of the result of measuring the distance between the outer surface of the shell of the rotary kiln and the liner inside the tire ring and the slip of the liner as shown in Fig.

division The first tire ring The second tire ring The third tire ring Inlet outlet Inlet outlet Inlet outlet Distance (d) (mm) 15.0 15.0 12.0 12.0 16.0 16.0 Slip (mm) 50.0 45.0 30.0 shape

The proper spacing between the outer surface of the shell of the rotary kiln and the liner inside the tire ring is 7 mm. If the measurement result is as shown in Table 2, the interval (d) of the second tire ring, 12 mm, The liner of each of the first tire ring and the third tire ring is judged to be worn because the distance between the respective liner and the outer surface of the shell is too large in the case of the first tire ring and the third tire ring, Therefore, it is considered necessary to replace the liner.

1-3. Tire ring and Support  Inspect roller wear

Table 3 shows an example of the results of measurement of the outer diameter at the center of the tire ring side surface and the distance from the center to the left and right at 200 mm intervals, respectively, as shown in Fig. 3 (unit: mm) .

division Location 1 Position 2 Location 3 The first tire ring 13816 13816 13815 The second tire ring 13815 13816 13816 The third tire ring 13816 13815 13816

As a result of the measurement, the outer diameters of the respective tire rings at positions 1 to 3 are not greatly different, and therefore it is judged that the first to third tire rings are both in good condition.

Table 4 shows the relationship between the center of the support roller side and the left and right sides of the center of the support roller relative to the rotation of the two support rollers supporting the rotating tire ring in accordance with the rotation of the shell at the bottom of each tire ring as shown in Fig. An example of the result of measuring the circumference at a distance of 200 mm (unit: mm) is shown.

division Location 1 Position 2 Location 3 The first tire ring
The first support roller 3925 3925 3925 The second support roller 3925 3925 3925 The second tire ring
The first support roller 3925 3925 3925 The second support roller 3925 3925 3925 The third tire ring
The first support roller 3925 3925 3925 The second support roller 3925 3925 3925

The proper circumference of the support roller of the rotary kiln is 3925 mm. As a result of measurement, the circumference of each support roller is the same at positions 1, 2 and 3, and therefore it is judged that the abrasion of the support roller is good.

1-4. End  Measure the amount of wear of the gear (girth gear) and the clearance between the pinion gear (top clearance and back lash)

A. Checking the state of driven gear engagement

To check the amount of wear of the driven gear and the backlash between the driven gear and the drive gear, check the engagement state of the driven gear and the drive gear as shown in FIG. The reason why the center of the driven gear is biased toward the input port during hot operation (by d ₂ (mm)) is that the stopper on both sides of the tire ring moves, so it is necessary to replace the worn, damaged or deformed stopper have.

B. Measurement of the clearance between the driven gear and the drive gear (top clearance and back lash)

Table 5 shows an example in which the clearance between the driving gear and the driven gear, that is, the top clearance (D ₁ ) and the backlash (D ₂ ) are measured as shown in FIG. 6, D ₁ ) shows only a small difference from the reference value and can be adjusted into the reference value by adjusting the support roller only.

division Reference value Measure The top clearance (D ₁ ) 6.5 to 8.5 mm 10.6mm (cold) Backlash (D ₂ ) 3.15 ~ 4.2mm

1-5. Rotary Kiln  Check the level and dimensions of each tire ring

As shown in Figs. 6 and 7, Table 6 shows the relationship between the lower portion of the tire ring provided on the outer periphery of the shell on each pier and the piercing angle of each of the first support roller and the second support roller of the tire ring The distance h between the first position (1) and the second position (2), the inclination (S ₁ ) between the center of the first tire ring and the center of the second tire ring, 3 is one example of a measure of the slope (S ₂₎ between the center of the tire ring.

division
The first support roller The second support roller Location ① Location ② Location ① Location ② The first tire ring 130.0 232.0 130.5 232.0 Slope (S ₁ ) 0.030 0.030 The second tire ring 745.9 847.9 746.4 848.9 Inclined (S ₂ ) 0.030 0.030 The third tire ring 1361.8 1463.8 1362.3 1465.8

As a result of measurement, the inclination (S ₁ , S ₂ ) between the tire rings is constant, and the first and second positions of the first support roller for each tire ring and the first and second positions of the second support roller, It is judged that the level h measured at the position does not have a large difference and it is not necessary to adjust the level separately.

As shown in Fig. 8, Table 7 shows an example in which the horizontal distance between the center of each tire ring and the center of two support rollers corresponding to each tire ring is measured (unit: mm ).

division
The first tire ring The second tire ring The third tire ring First location
(1) Second location
(2) First location
(1) Second location
(2) First location
(1) Second location
(2) The first support roller 1411.5 1417 1414 1410.5 1410 1412 The second support roller 1411.5 1410 1411.5 1414.5 1411.5 1411.5

In this case, the horizontal distance (1417 mm) at the second position of the first support roller of the first tier ring is significantly longer than the horizontal distance (1411.5 mm) at the first position, The distance 1414 mm in the first position is longer than the distance 1410.5 mm in the second position and the distance 1414.5 mm in the second position of the second support roller is longer than the distance 1411.5 mm in the first position In this case, it is determined that adjustment of the center position of the first and second support rollers of the second tire ring is necessary.

9A to 9C are views showing a method of calculating a position adjustment amount of a support roller corresponding to first to third tire rings of a rotary kiln according to an embodiment.

If the calculated adjustment amounts CC1 and CC2 calculated by subtracting the measured value from the calculated values are positive values, the positions of the corresponding support rollers are shifted to the center of the two support rollers, and when positive values are set, the positions of the corresponding support rollers are shifted to the outside of the two support rollers.

1-6. Rotary Kiln Shell  Displacement measurement

According to one embodiment, the amount of shell displacement of the rotary kiln is set at 800, 1200, 5000, 25960, 26960, 29200, 30200, 46460, 47460, 49690, 51040 mm away from the inlet of the rotary kiln, The measurement was made at eight points with respect to the circumference of the shell, and the measurement results are shown in Table 8.

Correction value The first tire ring The second tire ring The third tire ring location 800 1200 5000 25960 26960 29200 30200 46460 47460 49690 51040 One -5 -3 -3 -One -2 One -2 -2 One 3 One 2 0 0 0 0 0 0 0 0 0 0 0 3 17 7 One -One -One 0 One 4 7 0 -3 4 15 7 -One -One One 0 0 -One 4 -6 -13 5 -5 -5 -3 One 3 One -One 4 5 -4 -9 6 -20 -14 -3 3 2 2 3 -One 0 -2 -5 7 -13 -13 -5 3 One One 4 3 One -3 -5 8 -7 -11 -3 4 3 0 -One -2 0 One -One

FIG. 10B is a graph showing the amount of displacement measured according to the longitudinal and circumferential positions of the shell, and FIG. 10C is a distribution diagram showing eccentric deflection of the first to third tire rings according to the measured shell displacement. Typical displacement permissible values are ± 5 mm for the tire ring portion and ± 15 mm for the remaining shell portion. As shown in FIGS. 10A to 10C, when the eccentric sagging phenomenon occurs at the shell 6 to 8 position of the first tire ring at the input port And it is judged that this is mainly caused by wear of the inlet side sealing.

It is preferable to carry out the hot measurement of the rotary kiln at the actual use temperature. However, since it is expensive to heat the rotary kiln at the actual use temperature without inputting the raw material for the rotary kiln check, Is heated to 150 to 200 DEG C, and the hot measurement is carried out.

2-1. Rotary Kiln Shell  Measure the amount of slip

The slip of the shell can be known by marking the touched position of the touched ring and the shell in the stationary state, rotating the shell by an arbitrary reference number of times, and then measuring the interval between the marking of the touched ring and the shell , And the shell slip reference value of the rotary kiln according to the present invention is 25 mm / rotation or less.

2-2. Rotary Kiln Shell  Strain rate ovality ) Measure

The circumferential deformation of the shell of the rotary kiln, that is, the phenomenon of different radii of curvature depending on the position of the shell during one revolution of the shell (pulsation rotation) is irresistible in all parts of the rotary kiln shell, especially in the tiring area.

This variation is largely

1) deformation of the tire ring due to the reaction force of the support roller,

2) the case where the shell is deformed or flattened by the gap between the shell and the tire ring at the rotation apex.

These two deformations are transmitted to the refractory bricks in the shell and have a fatal impact on the life of the shell. In order to prevent the problem, the degree of the two deformations must be measured and managed appropriately at appropriate times.

As shown in Figs. 11A and 11B, the strain rate of the shell showing the degree of deformation of the shell was measured at three points at a uniform interval with respect to the circumference of the shell at a position 1 m away from the side center of each tire ring, (OD is the outer diameter of the shell, a is the reference radius of curvature of the shell, and b is the measured radius of curvature of the shell).

Ovality = {(4 x OD ² ) / 3} x? H Equation (1)

Table 9 is an example of strain rates measured and calculated at six positions one meter away from the side center of each tire ring, in accordance with one embodiment of the present invention, from the inlet and outlet sides, respectively.

division Measured value (%) The first tire ring The second tire ring The third tire ring ① ② ③ ④ ⑤ ⑥ Ⓐ 0.37 0.39 0.37 0.34 0.21 0.17 Ⓑ 0.42 0.36 0.51 0.42 0.3 0.25 Ⓒ 0.41 0.34 0.52 0.36 0.26 0.19 Average 0.40 0.36 0.46 0.37 0.25 0.21

The deformation of the shell causes the center of the rotary kiln to deviate from the geometric center so that irregular contact between the tire ring and the surface of the support roller occurs and overheating, irregular pressure, cracks and defects of the tire ring and the support roller surface . The permissible strains are, for example, 0.35 to 0.4%, but the permissible range varies depending on the size of the shell or shell. In the measured results, the second tiling shows a value 15% higher than the allowable level, and it is necessary to manage and adjust the gap between the shell and the tire and the gap between the shell and the tire.

Alignment measurements for the various mechanical components of a rotary kiln as described above manage the operation of the rotary kiln using only the results of cold and hot measurements, regardless of the load under actual operating conditions. Further, a problem with various mechanical elements of the rotary kiln as described above is solved by polishing (re-surface treatment) the surfaces of the tire ring and the support roller.

The hot and cold measurement results for the various mechanical components of the rotary kiln as described above are automatically or manually transmitted to the main controller of the central control panel so that the central control panel can remotely monitor the overall state of the rotary kiln, When the measurement result of the vehicle exceeds the reference value, the driver can be informed appropriately by visual / auditory means so that extreme damage or the like of the equipment can be prevented.

As described above, the alignment management system of the rotary kiln according to the present invention, which manages the alignment of the rotary kiln by the cold and hot measurements, is designed so that, regardless of the length of the body of the rotary kiln or the number of tire rings, Of the two bearing housings of the support roller supporting the tire ring of the rotary kiln in order to measure, in real time, the load actually applied to the support roller during actual driving, The deformation amount of the bearing housing and the actual applied load are directly measured. A strain gauge load cell can be used as the load measuring device. At this time, the strain gage load cell is configured to have a structure that can be easily attached to the bearing housing by, for example, a tapped hole.

By measuring the actual load acting on one of the bearing housings of each of the support rollers, it is possible to confirm the load applied to the corresponding support roller, and by finely adjusting the level of the first and second support rollers corresponding to each tire ring , The load applied to the support roller can be evenly distributed, and as a result, the alignment of the shell can be appropriately adjusted to prevent mechanical stress.

The strain gauge load cell is connected to a portable weight indicator to digitize load imbalance due to deformation of the support roller during rotation so that the operator can easily check it on the spot. Or manually to allow the central control panel to remotely monitor the actual load exerted on the entire support roller of the rotary kiln and to remotely monitor and report to the driver by visual / .

The above-described alignment management method of the rotary kiln according to the present invention can monitor the actual load applied to the support roller in real time and analyze the change in the load applied to the support roller to estimate the raw material firing state inside the rotary kiln And it is possible to prevent abrupt stop of the equipment and to prolong the service life of the equipment by managing extreme wear or deformation of the support roller and the tire ring in advance.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made without departing from the essential characteristics of the present invention by those skilled in the art. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

1: Fuselage 1a:
1b: Outlet 2:
3: Tire ring 4: Drive motor
5: drive gear 6: preheater
7: Burner 8: Support roller

Claims (5)

A rotary ring provided with a plurality of tires which are rotatably supported by two support rollers around the outer periphery of the shell, The method comprising:
Alignment management step of rotary kiln by cold measurement,
An alignment management step of the rotary kiln by hot measurement, and
Includes an alignment management step of the rotary kiln in actual operation,
The alignment management step of the rotary kiln in actual operation is a step of measuring a load applied to the housing of the bearing corresponding to the support roller,
The alignment management step of the rotary kiln by hot measurement is a step of measuring the slip state of the shell and the strain of the shell,
The strain rate of the shell,
Ovality = {(4 x OD ² ) / 3} x? H Calculated by equation (1)
Here, OD is the outer diameter of the shell, DELTA H = a - b, a is the reference radius of curvature of the shell, b is the measured radius of curvature of the shell, and a and b are 1m away from the side center of each tire ring Position at a uniform spacing with respect to the circumference of the shell of the position. ≪ RTI ID = 0.0 > 11. < / RTI >
The method according to claim 1,
The load applied to the housing of the bearing corresponding to the support roller is measured by providing a load measuring device at a lower portion of one of the two bearing housings corresponding to the support roller for supporting the tire ring of the rotary kiln Of the rotary kiln.
The method according to claim 1,
The alignment step of the rotary kiln by cold measurement is
A sealing state of the inlet and outlet, a wear state of the liner and stopper of the tire ring, a wear state of the tire ring and the support roller, a wear state and gap of the girth gear and the drive gear, The level and the dimension of the tire ring, and the displacement of the shell are measured and managed.
delete 3. The method of claim 2,
And the load measured by the load measuring device is transmitted to the main controller of the central control panel.

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