JP2003302174A - Method of measuring temperature of processed material of rotary temperature adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of measuring temperature for easily and precisely measuring the real temperature of a processed material in a rotary temperature adjusting device. <P>SOLUTION: The rotary temperature adjusting device comprises a shell to rotate around the axial line having an intake of the processed material on one end side and an outlet for discharging the processed material on the other end side, and a temperature adjusting means for heating or cooling the shell. The rotary temperature adjusting device also has a temperature measurement sensor fixing means inside the shell, and the method of measuring the temperature of the processed material is characterized by the process of measuring the processed material by fixing the temperature measurement sensor to the fixing means. In this case, a wire piercing from the intake through the outlet in the direction of the axial line of the shell may be used as the temperature measurement sensor fixing means. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a temperature of an object to be processed in a rotary type temperature adjusting device.

[0002]

2. Description of the Related Art A rotary type temperature control device is a device for supplying or heating an object to be processed into a rotating cylindrical shell. The object to be processed moves in the shell from the supply port side to the discharge port side as the shell rotates. Since the object to be processed is subjected to the desired processing during that time, knowing the temperature change during the movement of the object to be processed is extremely important in controlling the physical properties of the finally obtained object to be processed. . However, for example, in an internal combustion type rotary kiln, a temperature measuring sensor is inserted from the outer peripheral surface of the shell so as to come into contact with the object to be measured, so that the temperature of the object can be accurately measured. There wasn't. Since the shell of the rotary kiln rotates, the temperature measuring sensor reaches the lower position (position in contact with the object to be processed) for each rotation, and the amount of contact with the object to be processed is very small. This is because the temperature of the object to be processed can be measured only for the time, but the atmospheric temperature in the furnace is measured for most of the other time. Further, the temperature measuring sensor is usually protected by a protective tube made of stainless steel or the like in order to prevent the tip portion from being worn due to contact with the object to be processed. For this reason, even if the tip of the temperature measuring sensor comes into contact with the object to be processed, the temperature of the object to be processed cannot be instantaneously measured, and there is always a delay. As a result, the actual temperature of the object to be processed could not be accurately known.

Further, in the external heat type rotary kiln, since the outer peripheral surface of the shell is heated, it is difficult to provide a temperature measuring sensor on the outer peripheral surface of the heated portion of the shell. Therefore, it has been possible to measure the temperature of the object to be processed only at a position near the supply port and the discharge port other than the heated portion of the shell.
However, in the heat treatment in the external heat type rotary kiln,
It is important to know the exact temperature of the object to be treated at the heated portion of the shell, and it has been desired to develop a simple and highly accurate temperature measuring method for the object to be treated.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a rotary type temperature adjusting device, the actual temperature of an object to be processed can be easily and accurately measured at a required position. It is intended to provide a temperature measuring method.

[0005]

The temperature measuring method for a rotary type temperature adjusting device according to the present invention is provided around an axis having a supply port for the object to be processed at one end and a discharge port for discharging the object at the other end. A rotary temperature adjusting device comprising a rotating shell and a temperature adjusting means for heating or cooling the shell, wherein a temperature measuring sensor fixing means is provided in the shell, and the temperature measuring sensor is fixed to this fixing means. It is characterized in that the temperature of the object to be processed is measured.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a vertical cross section of a rotary type temperature adjusting device according to the present invention. This rotary type temperature control device includes a shell 3 made of stainless steel or the like having a supply part 1 for an object to be processed and a discharge part 2 for the processed object, and a broken line for heating or cooling the outer surface of the shell. And temperature adjusting means 4 shown by.

The shell 3 is arranged so as to penetrate the temperature adjusting means 4 in the longitudinal direction. Ring-shaped tires 5 and 6 are integrally provided on the outer peripheral surface of the shell 3 near both ends of the shell 3, and the shell 3 has receiving rollers 7 and
Supported by 8.

In the case of heat treatment, the temperature adjusting means 4 shown by the broken line is a heating chamber. This heating chamber is formed of an outer shell made of an iron plate and a fireproof heat insulating material, and is fixed on the base frame 9. Further, the heating chamber is provided with a burner for heating and an exhaust port for combustion gas.

On the other hand, in the case of the cooling process, the temperature adjusting means 4 shown by the broken line is a cooling mechanism, and a pipe having a nozzle for sprinkling water is appropriately arranged around the outer surface of the shell 3.

The shell 3 is provided on the outer peripheral surface of the shell between the receiving roller 8 of the discharge part 2 and the discharge port 10 by the sprocket wheel 1.
1, a sprocket wheel 11 and a sprocket 13 of a drive motor 12 supported by the base frame 9 are connected by a chain 14 to be rotationally driven. In addition, the axis of the shell 3 is installed horizontally or inclined (gradient is 1/100 to 3/100) so that the discharge side is slightly lowered.

The shell supply part 1 is composed of a supply part hood 15 and a supply hopper 16 for the object M to be processed, and is fixed on the base frame 9. The supply hood 15 prevents outside air from directly entering the shell and sucks gas generated from the inside of the shell, and is provided with a supply hood exhaust port 17 at its upper part. The supply hood exhaust port 17 communicates with a chimney (not shown) via a blower 18. The supply hopper 16 for the object to be processed M is provided such that the chute part 19 penetrates the supply part hood 15 so as to supply the object to be processed M into the shell. The tip of the chute portion 19 projects into the shell from a supply port 20 that is opened on the side surface of the shell, and the workpiece M that has been input does not fall into the supply hood 15. A small clearance is provided between the shell 3 and the supply hood 15, and they are almost sealed with a sealing material (not shown).

The discharge part 2 is composed of a discharge part hood 21 for preventing outside air from entering the shell. The shell 3 and the discharge part hood 21 are provided with a slight clearance so that a sealing material (not shown) is provided. It is almost sealed with. A chute (not shown) for taking out the object to be processed M discharged from the discharge port 10 of the shell is provided below the discharge part hood 21.

In the operation of the rotary type temperature adjusting device having the above construction, first, a constant amount of the object to be processed M is supplied from the supply hopper 16 into the shell 3 rotated by the drive motor 12.
Is supplied. The object M to be processed gradually flows to the processing section as the shell 3 rotates, and the outer peripheral surface of the shell 3 is heated or cooled by the temperature adjusting means 4 to be heated or cooled to a predetermined temperature. After that, the object M to be heated or cooled flows to the discharge port 10, is cooled to a desired temperature, and is discharged from the chute under the discharge hood 21 via the discharge port 10 of the shell. Is discharged. The discharged object to be processed is conveyed to the next step or a storage site by, for example, a bucket conveyor (not shown).

In the rotary type temperature adjusting device as described above, a feature of the present invention is that the shell 3 has a temperature measuring sensor fixing means. As an example of the temperature measuring sensor fixing means, a wire penetrating the shell 3 in the axial direction is stretched so that the temperature measuring sensor fixed to the wire can measure the temperature of the object to be processed at a desired position. The measured method will be described.

That is, reference numeral 22 is a wire which is a sensor fixing means for temperature measurement. The wire 22 has one end fixed to an appropriate position 23 of the discharge hood 21 and the other end connected to the wire tensioning means 30 and stretched. Temperature measurement sensor 26
Is fixed to the wire 22, and the position in the shell you want to measure is
For example, the sensor 26 is provided directly above the measurement position of the object M to be processed 27.
The hot junction portion (tip portion) is bent downward so as to be inserted into the object M to be processed. Further, the cold junction portion 29 of the temperature measuring sensor is fixed to the wire 22 so as to be outside the shell. The cold junction portion 29 is connected to a thermometer (not shown) by a compensating lead wire (not shown). Since the object M to be processed flows due to the rotation of the shell 3, if the object M has a large specific gravity or a lump, the temperature measuring sensor 26 moves in the rotating direction of the shell and separates from the object to be processed. In some cases, the temperature of the object to be processed cannot be measured. Therefore, the bent portion 27 of the temperature measuring sensor 26
By attaching the weight 28 between the hot contact portion which is the tip and the hot contact portion, the contact between the hot contact portion and the object to be processed can be secured.

A normal thermocouple can be used as the temperature measuring sensor, but a sheath type is preferable. Since the hot junction (tip) of the temperature measurement sensor and its surroundings are easily damaged by the friction of the workpiece that is constantly flowing, either increase the thickness of the protective tube at the easily rubbed portion or make it relatively heat conductive. A good protective case may be fitted.

The wire is fixed to the outside of the shell on the supply port side and the discharge port side regardless of the rotation of the shell, and the other end of the wire is prevented from loosening due to expansion of the wire caused by heating. It is preferable to provide the wire tensioning means 30. The wire tensioning means 30 is not particularly limited as long as it is a method capable of absorbing the thermal change in the wire length due to the temperature inside the shell, but for example, the weight (weight) 2 is provided via the pulley 24.
It can be connected to the cable 5 so that it is always slack. The material of the wire is not particularly limited and may be appropriately selected depending on the processing temperature. For example, the heating atmosphere temperature is 600 ° C
In the following cases, a stainless wire such as SUS316 can be used. Further, when the temperature is higher, a wire made of SiC is also suitable. Since this wire is a consumable item, it is preferable to replace it appropriately according to the condition of use. The wire can be easily replaced by attaching a new wire to one end of the wire currently in use and pulling it out from the other end.

The temperature measuring sensor fixing means is not limited to the wire as described above, and may be within a range not changing the gist of the present invention (that is, the substantial temperature of the object to be treated at a certain position in the shell). Any type of sensor, such as wire type, channel type, bar type, chain type, etc., depending on the type and application of the rotary type temperature control device, the temperature and atmosphere in the shell, etc. (For example, stainless steel, string-shaped SiC fiber, refractory, etc.), dimensions and the like can be changed as appropriate.

[0020]

EXAMPLE An example of the present invention is shown in FIG. Figure 2 shows shell inner diameter: 0.9m, shell length: 10m
It is a longitudinal cross-sectional view of the external heating type rotary kiln of (heating furnace inner length: 7 m). In addition, the names of the respective parts are numbered in the same manner as in FIG. 3 is a shell and 4 is an external heating furnace. Reference numeral 22 is a wire, one end of which is fixed to the outlet hood 21 by 23, and the other end of which is stretched by being connected to a wire slack preventing weight 25 via a pulley 24 of a wire tensioning means 30 provided on the supply port side. ing. The wire 22 is made of stainless steel and has a diameter of 6 mm. The temperature of the object to be heated was measured with a temperature measuring sensor. Is the temperature of the heating furnace inlet of the object to be heated, and is the temperature of the portions corresponding to the first zone, the second zone, and the third zone in the heating furnace,
Moreover, the temperature of the heating furnace outlet of the object to be heated was measured.
The temperature measuring sensors 1 to 3 are fixed to the wire 22 with stainless steel wires 31 at appropriate intervals, and the cold junction portions 29 are taken out of the shell from the outlet side. The cold junction 29 and the automatic temperature recorder were connected with a compensating lead wire to measure the actual temperature of the object to be heated during the heat treatment.

FIG. 3 shows details of the configuration from the bent portion to the tip of the sensor of each temperature sensor for measurement. 22 is 6 mm in diameter
This is a stainless steel wire. A temperature measuring sensor for this wire 22 is made of stainless steel wire 3 having a diameter of 1.0 mm.
It is fixed at 1. The temperature measuring sensor is a K type sheath thermocouple, made of SUS316, and has a diameter of 4.8 mm. Is a weight that secures a measurement position so that the tip of the sheath thermocouple does not move due to the flow of the object to be heated due to the rotation of the shell. The weight is 50 mm in diameter and 60 m in length.
A cylindrical SUS304 having a length of 940 g and a weight of 940 g was attached at a position 162 mm from the tip of the sheath thermocouple. In addition,
To fix this weight, separate color (SUS30
3) was used. Is a cap that protects the sheath thermocouple. Outer diameter 10.5 mm, wall thickness 2 mm, length 150 mm
This is a SUS316 pipe.

A copper granulated product was heat-treated using the temperature measuring sensor having the above structure. Heat treatment condition is 3
The temperature was 80 ± 20 ° C. × 180 minutes, and the passage time through the shell of the copper granulated product that was the object to be heated was 360 minutes. The temperature measurement result is schematically shown in FIG. The vertical axis of FIG. 4 is the actual temperature (° C.) of the object to be heated, and the horizontal axis is the elapsed time (minutes).
The numbers of the respective measured temperatures correspond to the numbers of the temperature measuring sensor shown in FIG. The lowest temperature is near the heating furnace inlet, and the highest temperature is in the third zone. In addition, each measured temperature is within ± 7 ℃,
It turns out that the measurement is accurate. Furthermore, since the distance from to the temperature measuring sensor is 5.3 m, the heating elapsed time of the object to be heated during this period is 190 minutes. Therefore, the object to be heated was maintained at 380 ± 20 ° C. for 190 minutes. In this way, it is possible to confirm that the copper granulated product of this example satisfies the heat treatment conditions.
Further, it is possible to control the heating state of the heating furnace and the rotation speed of the shell while observing the temperature measurement result (chart).
In this way, it is possible to obtain an object to be processed that has stable required physical properties. (Comparative Example) In this comparative example, a copper granulated product similar to that in the example was heat-treated using an internal heat type rotary kiln.
There were two temperature measuring sensors, one near the entrance of the heating zone inserted from the outer peripheral portion of the shell and the other near the center. A schematic diagram of the measurement results is shown in FIG. FIG. 5 shows the temperature change of the heated object near the inlet of the heating zone or the temperature change of the heated object near the center of the heating zone. In any of the temperature changes, the temperature of the object to be heated can be measured only for each rotation of the shell, and most of them measure the ambient temperature in the shell. Further, since the temperature recorder is a dot type, for example, at a temperature near the center of the heating zone, 380 ± 15 ° C.
And shows a very large temperature variation. here,
It is considered that the lower limit of the temperature variation is close to the actual temperature of the granulated copper product, but it is difficult to grasp the accurate temperature considering the thermal conductivity of the cap of the sheath thermocouple. The temperature measurement results near the entrance of the heating zone also show large temperature variations, and it is difficult to know the exact actual temperature of the object to be heated at this location.

[0023]

INDUSTRIAL APPLICABILITY The present invention relates to a rotary type temperature adjusting device comprising a shell rotating about an axis and a temperature adjusting means for heating or cooling the shell. In this method, a penetrating wire is stretched and a temperature measuring sensor is fixed to the wire to measure the temperature of the object to be processed. Therefore, since the actual temperature of the object to be processed can be known at any position, the processing condition can be controlled from the difference between the target temperature condition and the chart, and the object to be processed having stable required physical properties can be obtained. it can.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a rotary temperature adjusting device and a method for measuring a temperature of an object to be processed.

FIG. 2 is a diagram showing a rotary kiln of an example and a method for measuring the temperature of an object to be treated.

FIG. 3 is a diagram showing details from a bent portion of the temperature sensor for measurement to a tip portion of the sensor.

FIG. 4 is a schematic diagram showing a temperature measurement result of each sensor of the example.

FIG. 5 is a schematic diagram showing a temperature measurement result by each sensor of a comparative example.

[Explanation of symbols]

3: Shell 4: Temperature adjusting means 22: Wire 26:
Temperature measuring sensor 27: Bent portion 28: Weight 29:
Cold junction part M: Object to be processed

Claims (6)

[Claims] 1. A shell that rotates around an axis having a supply port for the object to be processed at one end and a discharge port for discharging the object at the other end; and temperature adjusting means for heating or cooling the shell. In the rotary temperature adjusting device, the temperature measuring sensor fixing unit is provided in the shell, and the temperature measuring sensor is fixed to the temperature measuring sensor fixing unit to measure the temperature of the object to be processed. Method for measuring the temperature of an object to be processed by a rotary temperature controller. 2. The object to be treated of a rotary type temperature adjusting apparatus according to claim 1, wherein the temperature measuring sensor fixing means is a wire penetrating in the axial direction of the shell from the supply port to the discharge port. How to measure temperature. 3. The object to be processed of the rotary type temperature adjusting apparatus according to claim 1, wherein the temperature measuring sensor is a sensor having a bent portion so that a tip portion of the sensor comes into contact with the object to be processed. Temperature measurement method. 4. The temperature of the object to be processed of the rotary type temperature control device according to claim 3, wherein the temperature measuring sensor has a weight between the bent portion of the sensor and a portion in contact with the object to be processed. Measuring method. 5. The temperature of an object to be processed of a rotary type temperature adjusting device according to claim 3 or 4, wherein the temperature measuring sensor has protection means for preventing wear of a portion of the sensor which comes into contact with the object to be processed. Measuring method. 6. The method for measuring the temperature of an object to be treated in a rotary temperature adjusting apparatus according to claim 2, wherein the wire has a wire tensioning means for tensioning the wire.