JP3173326B2 - Steel pipe temperature measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the surface temperature of a steel pipe.

[0002]

2. Description of the Related Art In the production of forged pipes, for example, it is necessary to measure the pipe surface temperature during pipe making and control the temperature based on the measured data to make the wall thickness uniform and prevent the occurrence of bent material. Is being done. As an apparatus for measuring the tube surface temperature, an apparatus as shown in FIG. 5 has been conventionally used.

[0005] FIG. 5 is a configuration diagram of a thermometer installed in a stage preceding a stretch reducer in a forged pipe manufacturing line. The forged pipe 1 made by the forged machine flows down to the cutting machine with the forged portion 12 being on the lower side. The temperature was measured using four or more thermometers, and the entire circumference was measured as much as possible. These thermometers are mounted on columns 13 to secure them in an optimal position. The support 13 is provided with a thermometer holder 14 for setting and fixing the thermometer 8 at an optimum position. At the tip of the holder 14, there is a detection unit case 15 for accommodating the detection unit, which is composed of a dustproof window, a dustproof air purge device, a cooling water device, and the like. As the thermometer 8, an infrared radiation thermometer is used.

Each detection unit is connected to a converter 17 and outputs from the converter are output from a temperature indicator 16 or a temperature recorder 1.
Instructed and recorded at 9. The operator observes the instructions and records, controls the pipe cooling water, and makes the wall thickness uniform and prevents the generation of bent material.

[0005]

In the prior art, a plurality of detectors are used to measure the temperature of the entire circumference as much as possible. When measuring the entire circumference by this method, there are the following problems.

(1) The number of detectors (thermometers) increases, making it difficult to measure the entire circumference. For example, when the size of the steel pipe is 100 A (φ114.3 mm), the measurement distance is 1
If the distance coefficient of the thermometer is 50 and the target size is 1000/50 = 20 mm, then to measure the temperature of the entire circumference, 114.3π / 20 =
18 thermometers are required. However, due to physical restrictions, only about four thermometers can be actually installed. Therefore, it becomes difficult to measure the entire circumference, and uneven thickness and bending cannot be sufficiently prevented.

(2) It is difficult to measure near the forged portion. In the production of a forged pipe, the forged portion is located directly below. The vicinity of the forged portion has a complicated shape, and since it is right below, there are many changes in temperature, and the demand for measurement is high.

[0008] However, it is difficult to measure from directly below the pipe due to the drop of cooling water, scale, or the like.

(3) Time is required for maintenance and management. When a large number of detectors are used, it takes time to maintain and manage the accuracy.
As a solution to these problems, Japanese Utility Model Laid-Open No. 1-972
There is a technique disclosed in Japanese Patent Publication No. 27-27. In this method, the entire circumference of the material to be measured is measured by one radiation thermometer that rotates the concentric outer circle of the material to be measured. However, since this device rotates 360 degrees, a signal transmission / reception mechanism such as a slip ring, a brush, a transformer coupling, a capacitor coupling, or the like is required. Generation and signal level reduction.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a steel pipe temperature measuring device capable of measuring the temperature of the entire circumference of a pipe with high accuracy and at low cost. Aim.

[0011]

An object of the present invention is to provide a motor having a 180 ° + α ° (α = 180 °) centered on an axis substantially the same as the central axis of a steel pipe.
0 to 60) a sensor holder rotatably provided, a first measurement hole provided through the sensor holder at a position where at least the upper half of the steel pipe can be viewed in accordance with the rotation of the sensor holder, and a sensor holder provided in accordance with the rotation of the sensor holder. A second measurement hole provided through the sensor holder at a position where at least a lower half of the steel pipe can be viewed, first and second radiation thermometers having a light receiving portion fixed to an outer surface of the sensor holder; A first reflecting mirror for guiding radiation light from a steel pipe passing through the measurement hole to a light receiving portion of the first radiation thermometer, and a radiation mirror for guiding radiation light from the steel pipe passing through the second measurement hole to a second radiation thermometer. A second reflecting mirror for guiding to the light receiving portion, wherein at least the second measurement hole looks near the rotation axis of the sensor holder and is inclined in the front-rear direction of the sensor holder. Omit the measuring device and the reflector, It is solved by the steel pipe temperature measuring device attached to the direct measurement hole a receiving portion of the thermometer morphism.

[0012]

By rotating the sensor holder, the temperature of the upper half of the steel pipe can be measured from the first measurement hole, and the temperature of the lower half of the steel pipe can be measured from the second measurement hole. In the most preferred embodiment, if the first measurement hole and the second measurement hole are positioned symmetrically with respect to the rotation axis of the sensor holder, 18
By rotating the sensor holder by 0 °, the temperature of the entire circumference of the steel pipe can be measured. If the first measurement hole and the second measurement hole are not positioned symmetrically with respect to the rotation axis of the sensor holder, the sensor holder needs to be turned 180 to measure the temperature of the entire circumference of the steel pipe.
Must be rotated more than °. It is sufficient to allow a maximum margin of about 60 ° for the rotation margin of 180 ° or more, and this is set as the upper limit. The radiated light from the steel pipe passing through each measurement hole is reflected by the reflecting mirror and enters the light receiving section of the radiation thermometer. As the radiation thermometer, it is preferable to use an optical fiber radiation thermometer in which an optical fiber is used for a light receiving unit and a light receiving unit is separated from a measuring unit (photoelectric conversion element). In addition, since the second measurement hole is inclined with respect to the front-rear direction of the sensor holder, even when it is below the steel pipe, falling scale, cooling water, etc. do not enter and are not affected by these. . On the other hand, the first measurement hole may have the same structure as the second measurement hole. However, since the first measurement hole is located on the upper side of the steel pipe, falling scale, cooling water, and the like do not enter the first measurement hole. It may be substantially perpendicular to the rotation axis.

In the above configuration, the reflecting mirror may be omitted, and the light receiving section of the radiation thermometer may be directly attached to the light receiving section.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A steel pipe temperature measuring apparatus according to one embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an apparatus for measuring the pipe surface temperature of a forged pipe. The forged pipe 1 travels straight at a speed of 45 m / min to 120 m / min with the forged portion downward. Two radiation thermometer sensors 2 are mounted at symmetrical positions with respect to the rotation axis of the sensor holder 3, and the sensor holder 3 is turned 180 degrees by the turning mechanism 4, and one sensor can measure the temperature of 180 degrees. .

The operation of the turning mechanism is performed by the machine side operation panel 5 and the cab operation panel 6. A signal from the radiation thermometer sensor (light receiving section) 2 is converted into a thermometer output by a thermometer (measuring section) 8 via an optical fiber 7. This temperature output is input to the signal processing device 9. On the other hand, a position pulse transmitter 10 and a reference sensor 11 are provided in the turning mechanism. The reference sensor 11 outputs when the rotation angle of the sensor holder 3 is at the reference position. By combining this output with the pulse from the position pulse transmitter 10, the rotation angle of the sensor holder 3, that is, the measurement position of the radiation thermometer sensor 2, can be known. The signal processing device 9 performs measurement data processing, chart display, data accumulation,
Process and output recorder output, control output, etc.

FIG. 2 is a detailed view of the radiation thermometer sensor holder 3. With respect to the forged pipe 1, the upper sensor 2-a measures the upper 180 degrees of the pipe. The lower sensor 2-b is the lower part 1 of the pipe.
Measure 80 degrees. The tube is at a temperature between 500 and 1200 degrees and there is a cooling water bottle 20 between the tube and the sensor. The measurement hole of the sensor is formed in the water bottle 20. The upper sensor measurement hole 18-a is formed perpendicularly to the rotation center axis of the sensor holder 3, and the lower sensor measurement hole 18-b is formed.
Is machined so as to look at the rotation center axis of the sensor holder 3 and to tilt in the front-rear direction of the sensor holder 3. Since the lower sensor measurement hole 18-b is machined so as to be inclined in the front-rear direction of the sensor holder 3, the scale of the pipe, cooling water, and the like do not fall into the measurement hole. If necessary, the measurement hole 18
If -a and 18-b are purged with air or the like, the effects of scale, cooling water, and the like can be more reliably prevented.

The radiated light from the forged pipe 1 is transmitted to the measurement hole 18-
After passing through a and 18-b, the light is reflected by the reflecting mirror 23 and enters the upper sensor 2-a and the lower sensor 2-b.

Further, the sensors 2-a and 2-b of the radiation thermometer may be directly attached to the measurement holes 18-a and 18-b.
In this case, it is particularly preferable to use an optical fiber radiation thermometer.

FIG. 3 is a diagram showing a simple configuration of the turning mechanism. The main rotating part 21 using a motor as a power source and the sensor holder 3 are connected by gears or the like. Is rotated by being supported by the auxiliary rotation unit 22 with the rotation of.

FIG. 4 shows an example of the output from the signal processing device, in which the temperature distribution in the circumferential direction of the tube is displayed and printed. By looking at this distribution, the operator can understand the state of the temperature and can easily perform the pipe cooling operation.

[0021]

As described above, according to the present invention, the temperature in the circumferential direction of the tube can be accurately measured with a simple structure. In addition, since the rotation angle does not exceed 360 °, a slip ring or the like becomes unnecessary, the cost can be reduced, and the generation of noise can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus showing one embodiment of the present invention.

FIG. 2 is a detailed view of a radiation thermometer sensor holder in an apparatus showing one embodiment of the present invention.

FIG. 3 is a configuration diagram of a turning mechanism in an apparatus according to an embodiment of the present invention.

FIG. 4 is an example of an output from a signal processing device in a device according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of an example of a conventional thermometer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forged pipe 2 Radiation thermometer sensor 2-a Upper sensor 2-b Lower sensor 3 Sensor holder 4 Rotation mechanism 5 Machine side operation panel 6 Operation room operation panel 7 Optical fiber 8 Thermometer 9 Signal processor 10 Position pulse transmitter 11 Reference sensor

Continuation of the front page (56) References JP-A-4-254726 (JP, A) JP-A-1-97227 (JP, A) JP-A-1-132936 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) G01J 5/10

Claims (2)

(57) [Claims] An apparatus for measuring the temperature of a running steel pipe, comprising:
A sensor holder rotatably provided at 0 ° + α ° (α = 0 to 60), and a first measurement hole provided through the sensor holder at a position where at least the upper half of the steel pipe can be viewed in accordance with the rotation of the sensor holder. A second measurement hole penetrating the sensor holder at a position where at least the lower half of the steel pipe can be viewed in accordance with the rotation of the sensor holder, and first and second radiation sources having light receiving portions fixed to the outer surface of the sensor holder. A thermometer, a first reflecting mirror for guiding radiated light from the steel pipe passing through the first measurement hole to a light receiving portion of the first radiation thermometer, and a radiated light from the steel pipe passing through the second measurement hole. A second reflector for guiding to a light-receiving part of the second radiation thermometer, wherein at least the second measurement hole is in the vicinity of the rotation axis of the sensor holder and is inclined in the front-rear direction of the sensor holder. A steel pipe temperature measuring device, characterized in that: 2. An apparatus for measuring the temperature of a steel pipe during traveling, comprising:
A sensor holder rotatably provided at 0 ° + α ° (α = 0 to 60), and a first measurement hole provided through the sensor holder at a position where at least the upper half of the steel pipe can be viewed in accordance with the rotation of the sensor holder. A second measurement hole provided through the sensor holder at a position where at least the lower half of the steel pipe can be viewed in accordance with the rotation of the sensor holder, a first measurement hole, and a second measurement hole.
First and second radiation thermometers each having a light receiving portion fixed to each of the measurement holes, wherein at least the second measurement hole is in the vicinity of the rotation axis of the sensor holder and is in the front-rear direction of the sensor holder. A steel pipe temperature measuring device, characterized in that it is inclined at a angle.