JPH11276921A - Abnormal temperature detector for rotary part of grinding mill and oiling to rotary part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect abnormal temperature of a rotary part revolving around a rotating shaft in a casing in a grinding mill. SOLUTION: In this grinding mill, a vertical rotating shaft 11 is installed in a mill casing 10, and a grinding roller 13 is fitted freely rotatably around the rotating vertical shaft 11. The rotating part of the grinding roller 13 is provided with a thermocouple 30 for measuring temperature of a sliding surface, and from this thermocouple 30, a measured temperature signal is led to a transmitter provided on a spider 12 integrated to the vertical rotating shaft 11, and from this transmitter, the measured temperature signal is radio transmitted to a receiver 50 outside the mill casing 10. The radio transmission is performed without any trouble even if a point to be measured is rotated. When the measured temperature exceeds an allowable value (dangerous temperature), the mill is forcibly stopped, and the indication is obtained and also an alarm is raised. The measured temperature is automatically recorded by a recorder, and from the secular change of the shaft temperature (sliding area temperature), oiling time is determined. By performing inspection and maintenance such as this suitable oiling, the life of the rotating part can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cement raw material,
The present invention relates to a device for detecting an abnormal temperature of a rotating part of a grinding mill such as a roller bearing (oil journal) of a roller mill for grinding a granular material such as a carbon electrode material and titanium oxide, and a method of lubricating the rotating part.

[0002]

2. Description of the Related Art For example, a vertical roller mill shown in FIGS. 1 to 3 is provided with a rotating vertical shaft 11 in the center of a casing 10;
A roller 13 is rotatably mounted around a spider 12 fixed to an upper end of the rotating vertical shaft 11, and the roller 13 is rotated and rotated (revolved) around the rotating vertical shaft 11,
The raw material a is pulverized between the roller 13 and the tire 14 on the inner surface of the casing 10.

[0003] In this vertical roller mill, generally, when the lubrication state of the bearing portion deteriorates, the bearing temperature increases, and the lubrication state further deteriorates, resulting in seizure. For this reason, in particular, since the roller 13 rotates at a high speed, it is necessary to periodically supply grease to its rotary bearing portion (for details, see an embodiment described later). Conventionally, the refueling is performed every required operation time.

[0004]

As described above, the rotary bearing of the roller 13 is periodically refueled.
Generally, if lubrication is performed early due to fear of seizure due to oil shortage, excessive lubrication will occur, causing problems such as deterioration of lubricating oil due to inflow into other bearing lubricating oil and mixing of raw grease raw material. On the other hand, if the refueling time is delayed, the oil runs out and seizure of the shaft occurs, and the crushed powder easily enters the bearing portion, and the seizure is accelerated.

Further, if the temperature of the bearing sliding portion is measured and lubricated appropriately before the temperature exceeds the allowable temperature, problems such as seizure due to the deterioration of the lubricating oil can be solved. However, since the roller 13 rotates at high speed around the rotating vertical shaft 11, the temperature of the bearing sliding portion cannot be derived to a stationary position outside the casing 10 by a simple means such as a lead wire. The fact is that the temperature is not measured. The point where this measurement is not performed is not limited to the vertical roller mill shown in FIG.

A first object of the present invention is to make it possible to detect an abnormal temperature of a rotating part that rotates and revolves in a grinding mill, and to appropriately supply oil to the rotating part. This is a second problem.

[0007]

In order to achieve the first object, the present invention measures the temperature of a sliding surface of a rotating part which rotates and revolves in a mill casing, and outputs the measured temperature signal. It is led out of the casing by radio, and the abnormal temperature of the rotating part is detected based on the derived measured temperature signal. With wireless transmission, there is no problem even if the measured point is rotated.

In order to achieve the second object, the present invention records the above-mentioned measured temperature and replenishes the rotating part based on the temperature change of the rotating part. If the lubricating oil runs out, the temperature rises. If lubrication is performed before the temperature at which seizure occurs, seizure can be effectively prevented, and the life of the rotating part can be extended.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is as follows.
A rotating vertical shaft is provided in the mill casing, a grinding roller is rotatably mounted around the rotating vertical shaft, and a sensor for measuring the temperature of the sliding surface is provided in a rotating portion of the grinding roller, and a sensor is provided. A configuration is adopted in which the measured temperature signal is guided to a transmitter provided on a rotating shaft, and the measured temperature signal is wirelessly transmitted from the transmitter to a receiver outside the mill casing.

[0010] A thermocouple or the like can be adopted as the sensor,
The temperature is detected by bringing the thermocouple into contact with a bush or the like of the rotating part. Guide sawn the detection signal to the outside via the transceiver, the allowable value the measured temperature T _n (critical temperature T ₀₎
If it exceeds, the mill is forcibly stopped, a message to that effect is displayed and an alarm is issued. Further, the measured temperature is automatically recorded by a recorder, and the lubrication timing is determined based on the change over time of the shaft temperature (sliding surface temperature).

Incidentally, the abnormal temperature detecting stage of the sliding portion includes:
Or said measured temperature T _n exceeds the allowable temperature T _0, others to determine whether the measured temperature increase rate (Td _n = T _n -T
_n-1) is or is determined by whether or not exceeds the allowable value Td _0, also the rate of change of the temperature increase rate (Tdd _n = Td _n -Td
_n-1) is determined by whether or not exceeded the allowable value Tdd _0, it can be adopted of equal various.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment is shown in FIGS. 1 to 8 and relates to a roller mill.
The motor M rotates counterclockwise at a constant rotation speed via the speed reducer B. Oil journal 20 supporting roller 13
Is suspended by connecting via a pin 16 a bearing 15 (not shown) of a spider 12 that rotates together with the vertical shaft 11, and rotates on a concentric circumference in the same direction as the vertical shaft 11. I do. For this reason, the oil journal 20
The roller 1 is moved outward by centrifugal force around the pin 16 and
3 is pressed against the tire 14 fixed to the mill base 17. As shown in FIG. 3, the oil journal 20 has a structure in which an upper main body 21a and a lower main body 21b are integrated, and is rotatable around a journal shaft 22 integrated with a journal head 23, and is fixed to the lower main body 21b. When the roller 13 moves in the circumferential direction concentric with the vertical shaft 11 while being pressed by the tire 14, the roller 13 rotates right (rotates) around the journal shaft 22.

The raw material a is supplied into the mill by a rotary feeder V provided on an upper side surface of the casing 10, while air b for pneumatically transporting the crushed raw material a 'is blown by an air blower (not shown) in an air housing. 1
8 into the casing 10. For this reason, the raw material a is raked up by the blow 19 rotating together with the vertical shaft 11, continuously supplied between the roller 13 and the tire 14, and crushed by the pressing force of the roller 13. The pulverized raw material a 'passes between the spider 12 and the side surface of the casing 10, is pneumatically transported upward, and is stored in a product hopper through a classifier and a bag filter (not shown).

The structure of the oil journal 20 will be described in detail with reference to FIG. 3. The journal head 23 and the journal shaft 22 are hardened by hardening. The upper main body 21a and the lower main body 21b are connected to an upper bush 24a and a lower bush 24b between the journal shaft 22 and
Further, three sliding bearings of a head bush 24c between the journal head 23 and the upper main body 21a can freely rotate around the journal shaft 22. Lubricating oil to the bearing portion of the journal shaft 22, that is, the upper bush 24a and the lower bush 24b, is accumulated in the lower oil berth 27 through the oil supply hole 26 provided in the shaft 22 by the lubrication fitting 25 on the upper portion of the shaft. The oil level is near the upper end of the upper bush 24a. The lubricating oil hardly decreases because the oil supply hole 26 is sealed with the plug 25a, and there is no need to supply the oil for a long time.

On the other hand, the lubricating oil of the bearing portion of the journal head 23, that is, the head bush 24c is supplied periodically by the grease nipple 28.
That is, during the operation of the mill, the oil journal 20 is exposed to a high-concentration atmosphere by the pulverized raw material a, and fine powder tends to enter the bearing from a gap (sliding surface) between the upper main body 21a and the head bush 24c. . This is likely to occur if the grease refueling interval is inappropriately long. If the grease runs out, the temperature rise naturally occurs due to frictional heat on the sliding surface between the head bush 24c and the upper main body 21a, and the temperature rise is further accelerated by the intrusion of the fine powder, which may damage the bearing or cause seizure. I do. If this is feared and lubrication is frequently performed or the lubrication amount is excessively increased, grease leaks from the inside of the bearing, and grease flows out onto the surface of the upper main body 21a and mixes with the product a ', or overflows above the head bush 24c, causing the journal shaft to overflow. There is a problem in that the lubricant flows down toward the upper bush 24c from the gap between the upper body 22a and the upper bush 24c and mixes with the lubricating oil in the oil base 27 to cause deterioration of the lubricating oil. In addition, the lubrication timing is as follows. After the operation, the lid of an inspection port (not shown) is opened, each oil journal 20 is inspected, and the temperature of the outer surface of the journal head 23 near the head bush 24c is measured by a tentacle or a portable thermometer. However, they are often omitted because of troublesome work, so that the refueling interval becomes inaccurate, and the above-mentioned adverse effects have occurred.

In this embodiment, each journal head 23
Contact the head bush 24c with the bearing of the thermocouple 30.
(30a, 30b, 30c, 30d), the bearing temperature is detected, and as shown in FIGS.
Is connected to the transmitter 40 provided on the upper surface of the spider 12. As shown in FIG. 4, the transmitter 40 converts a temperature signal (several mV) from the thermocouple 30 into an analog signal (for example, full scale 0 to full scale 0) of a level unified with respect to full scale by a thermoelectric temperature converter 41. 0 for 200 ° C
1.0 V (volt) DC), and the
The analog signals serially arranged in a time division manner from 1 to n in the input order are converted into cyclically repeated signals.
The digital signal is binary-coded according to the analog signal level by the conversion unit 43, the carrier wave 44 is digitally modulated by the code, amplified by the power amplification unit 45, and the transmission antenna 46 emits radio waves. In the embodiment, since four oil journals 20 are provided, there are also four bearing portions (n = 4). In each drawing, corresponding to each bearing portion,
“1 to 4” or “No. 1 to No. 4” is described.

A receiving antenna 51 is provided on the inner surface of the casing 10, and a radio wave received by the receiving antenna 51 is input to a receiver 50 via a coaxial cable 51a. As shown in FIG. 4, the receiver 50 separates and amplifies only the transmission radio wave in the receiving unit 52,
Demodulated to a binary-coded digital signal, and stored in the data register 55 at one time. The digital temperature data is sequentially shifted to the output memory 56 and subjected to serial-parallel conversion.
is converted to an analog signal of mA (milliampere) DC,
Input to thermometers 58a to 58d with alarm contacts (general symbol: 58). At the same time, it is output as a bearing temperature signal. Bearing temperature T _n is the control value T ₀ in the alarm contact with the thermometer 58
When it is detected that it has become abnormally high over the (allowable value),
An alarm is issued and a mill stop signal is output to a mill power control panel (not shown) to forcibly stop the main motor M.

The signal patterns S _{1 to} S ₅ (S
_1: change pattern bearing temperature T _n, S _2: the bearing temperature T _n
FIG. 6 shows the time-division feed pattern, S ₃ : conversion pattern from analog signal to binary code, S ₄ : binary coding pattern from received radio wave, and S ₅ : conversion pattern from binary code to analog signal. Show. In this figure, the time axes of (2) to (4) are enlarged in comparison with (1) and (5) for convenience of illustration. Each bearing temperature is also shown with a difference, and t indicates time.

The temperature signals of the respective shafts (head bush 24c) output from the receiver 50 are calculated by calculating units 60a to 60d (general symbol: 60) in FIG.
And is input to the multi-point temperature recorder R _1. Since the bearing temperature rise corresponding to the difference between the bearing temperature T _n and the ambient temperature T _a around the bearing, for measuring the ambient temperature T _a, the casing 1
0 provided a thermocouple (not shown) measures the temperature of the inner casing 10, the taken out the measurement signal and the bearing temperature signal as a temperature rise signal △ T _n of comparison operations to each axis in the calculator 60 of FIG. 5 , Input to the multipoint temperature recorder R ₂ (ΔT _n = T
_n -T _a). The ambient temperature Ta is _measured by both multipoint temperature recorders R ₁ , R
Is also input to the _2, was provided to both the recorder R _1, R ₂ is for precision compensation.

The refueling timing is determined by examining in advance the pattern of the change over time of the mill operation cumulative time and temperature rise from the first refueling to the next suitable refueling period, and recording units (multipoint temperature recorders R ₁ and R _2). Judgment is made visually from both the temperature record and the elapsed mill operation time. 7 and 8 show typical temperature recording patterns.

FIG. 7 shows a raw temperature record (recorder R ₁ ) which does not pass through a computing unit, for ascertaining a change in the difference between the control temperature T ₀ and the bearing temperature T _n , and FIG. in what you see a change △ T _n of bearing temperature rise through the (recorder R _2), without being influenced by the change in the ambient temperature, intended to grasp the change in bearing temperature due to the lubrication of the bearings It is. Now, go to the beginning of the refueling, to start the mill that has been stopped at t ₀ points. At this point, the bearing temperature T _n is
Coincides with the ambient temperature, ie the mill internal temperature T _a. Accordingly, there is no temperature rise, and the temperature recorder R ₂ records 0 ° C. When the mill is started, the roller 13 in FIG. 3, that is, the upper main body 21a rotates, and frictional heat is generated on the sliding surface with the head bush 24c. This frictional heat is being transferred from the head bush 24c to the journal head 23 is radiated from the journal head 23 surface, since there are more frictional heat generated, bearing temperature T _n increases. Bearing temperature T _n over operation time continues to _rise, saturated with ₁ point t. It is a considerable time between t ₁ and t ₂ , and during this time,
There is a case where the operation is performed continuously, and a case where the operation is performed for several days and stopped for several days is repeated according to the production plan. In the latter case, reduction T _n at the time stopped at between t ₁ ~t ₂ until T _a (△
T _n is reduced) to 0 ° C., the same Atsushi Nobori curve and between t ₀ ~t ₁ is recorded at the time of restart (not shown).

If lubrication is performed properly near the lubrication timing,
Although bearing temperature T _n as shown in the drawing the solid line is returned to the original normal value,
If left without refueling, the temperature will continue to rise as shown by the broken lines in FIGS. 7 and 8, and will reach the control temperature (T ₀ ), and the alarm contact of the thermometer 58 with alarm contact will be actuated (prone) to generate an alarm. As soon as the mill is stopped. If, in the case of continued operation without stopping the mill at this point, bearing temperature T _n continued rise further, the lubricating film of the friction surface and disruption, leading to with locally or entirely tempered, journal head 23 of the bearing (head bush 24c).

In this embodiment, the multipoint temperature recorders R ₁ , R
Although from ₂ bearing temperature rise recorded it is visual judgment refueling timing, when the mill operating time (integration time) exceeds t _2, provided with a preset counter for outputting an electrical contact, multi-point temperature recorder provided alarm contact to R _1, R _2, mill operation time exceeds t _2, and, when the bearing temperature T _n exceeds the set temperature T _c, or △ T _n is the temperature ΔT set in advance from standard temperature It is also possible to automatically issue an alarm or display a lamp when _c exceeds _c . This alarm / lamp display need not be performed by both thermometers R ₁ and R ₂ , but may be performed by only one of them. It is not necessary to record at the time of this automatic warning,
T _n and T _c, as compared by the comparator with [Delta] T _n and [Delta] T _c, may be an alarm or the like based on the comparison value.

[0024]

As described above, according to the present invention, the temperature is detected from the rotating part which revolves, so that the temperature rise of the rotating part can be accurately grasped, and damage such as seizure can be effectively prevented. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of one embodiment.

FIG. 2 is a cut-away plan view of the embodiment.

FIG. 3 is a sectional view of a main part of FIG. 1;

FIG. 4 is a block diagram of a transmitter and a receiver.

FIG. 5 is a block diagram of a calculation unit.

FIG. 6 is a diagram of each signal pattern.

FIG. 7 is a temperature pattern diagram.

FIG. 8 is a temperature pattern diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mill casing 11 Rotating vertical shaft 13 Crush roller 14 Tire 20 Oil journal (rotating part) 22 Journal shaft 23 Journal head 24c Head bush 30 Thermocouple 31 Compensating lead wire 40 Transmitter 50 Receiver

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[Procedure amendment]

[Submission date] June 19, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

On the other hand, the lubricating oil of the bearing portion of the journal head 23, that is, the head bush 24c is supplied periodically by the grease nipple 28.
That is, during the operation of the mill, the oil journal 20 is exposed to a high-concentration atmosphere by the pulverized raw material a, and fine powder tends to enter the bearing from a gap (sliding surface) between the upper main body 21a and the head bush 24c. . This is likely to occur if the grease refueling interval is inappropriately long. If the grease runs out, the temperature rise naturally occurs due to frictional heat on the sliding surface between the head bush 24c and the upper main body 21a, and the temperature rise is further accelerated by the intrusion of the fine powder, which may damage the bearing or cause seizure. I do. If this is feared and lubrication is frequently performed or the lubrication amount is excessively increased, grease leaks from the inside of the bearing, and grease flows out onto the surface of the upper main body 21a and mixes with the product a ', or overflows above the head bush 24c, causing the journal shaft to overflow. 22 and flows down from the gap between the upper body 21a toward the upper bushing 24c, there are problems such as cause deterioration of the lubricating oil mixed in the lubricant oil in the oil bar scan 27. The timing of refueling should be
The lid of an inspection port (not shown) provided in the casing 10 is opened, each oil journal 20 is inspected, and the temperature of the outer surface of the journal head 23 near the head bush 24c is measured and managed by a tentacle or a portable thermometer. However, the operation is apt to be omitted because of the troublesome work, so that the refueling interval becomes inaccurate, and the above-mentioned adverse effects have occurred.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

The temperature signals of the respective shafts (head bush 24c) output from the receiver 50 are calculated by calculating units 60a to 60d (general symbol: 60) in FIG.
And is input to the multi-point temperature recorder R _1. Since the bearing temperature rise corresponding to the difference between the bearing temperature T _n and the ambient temperature T _a around the bearing, for measuring the ambient temperature T _a, the casing 1
0 provided a thermocouple (not shown) measures the temperature of the inner casing 10, the taken out the measurement signal and the bearing temperature signal as a temperature rise signal △ T _n of comparison operations to each axis in the calculator 60 of FIG. 5 , Input to the multipoint temperature recorder R ₂ (ΔT _n = T
_n -T _a). The ambient temperature Ta is _measured by both multipoint temperature recorders R ₁ , R
₂ is also entered . The two recorders R ₁ and R ₂ are provided to make it easy to grasp the bearing temperature change,
This is for improving the accuracy of the judgment of the bug .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

FIG. 7 shows a raw temperature record (recorder R ₁ ) which does not pass through a computing unit, for ascertaining a change in the difference between the control temperature T ₀ and the bearing temperature T _n , and FIG. in what you see a change △ T _n of bearing temperature rise through the (recorder R _2), without being influenced by the change in the ambient temperature, intended to grasp the change in bearing temperature due to the lubrication of the bearings It is. Now, go to the beginning of the refueling, to start the mill that has been stopped at t ₀ points. At this point, the bearing temperature T _n is
Coincides with the ambient temperature, ie the mill internal temperature T _a. Accordingly, there is no temperature rise, and the temperature recorder R ₂ records 0 ° C. When the mill is started, the roller 13 in FIG. 3, that is, the upper main body 21a rotates, and frictional heat is generated on the sliding surface with the head bush 24c. This frictional heat is emitted is transmitted to the journal head 23 from the journal head 23 surface from the head bushing 24c, since greater in frictional heat generated, bearing temperature T _n increases. Bearing temperature T _n over operation time continues to _rise, saturated with ₁ point t. It is a considerable time between t ₁ and t ₂ , and during this time,
There is a case where the operation is performed continuously, and a case where the operation is performed for several days and stopped for several days is repeated according to the production plan. In the latter case, reduction T _n at the time stopped at between t ₁ ~t ₂ until T _a (△
T _n is reduced) to 0 ° C., the same Atsushi Nobori curve and between t ₀ ~t ₁ is recorded at the time of restart (not shown).

Claims (3)

[Claims] 1. A temperature of a sliding surface of a rotating part which rotates and revolves within a mill casing 10 is measured, a measured temperature signal is wirelessly led out of the casing 10, and based on the derived measured temperature signal, An abnormal temperature detecting device for a rotating part of a pulverizing mill for detecting an abnormal temperature of a rotating part. 2. A rotary vertical shaft 1 in the mill casing 10.
The grinding roller 13 is rotatably mounted around the rotating vertical shaft 11, and a sensor 30 for measuring the temperature of the sliding surface is provided at a rotating portion of the grinding roller 13, and the rotation from the sensor 30 is performed. The measured temperature signal is guided to a transmitter 40 provided on the vertical shaft 11, and the measured temperature signal is wirelessly transmitted from the transmitter 40 to a receiver 50 outside the mill casing 10. Item 2. An abnormal temperature detector for a rotating part of a grinding mill according to item 1. 3. A lubricating device for a grinding mill which records a measured temperature of the abnormal temperature detecting device according to claim 1 or 2 and replenishes the rotating portion based on a change with time in the temperature of the rotating portion. Method.