JPH01209328A - Position control apparatus of thermometric probe - Google Patents

Abstract

PURPOSE:To automate thermometry, by a method wherein a thermometric probe is driven in a thermometric direction by forwardly rotating a drive mechanisms to detect the position of said probe and the forward rotation of the drive mechanism is stopped when the probe reaches a scheduled thermometric position to start thermometry and the drive mechanism is reversed by a thermometry finish signal. CONSTITUTION:A thermometric probe 3 is held above the level 2 of the molten steel received in a laddle 1 by a holder 4 and allowed to rise and fall by a lift arm 5. A motor 7 is forwardly rotated by the indication of a programmable controller PCU 15 and the probe 3 is allowed to fall by a lift mechanism 6 through a speed reducer 9. At the same time, a pulse generator 10 is driven through a speed reducer 9 to generate a pulse which is, in turn, counted by the PCU 15 and, when the number of pulses reach the value present from an operation table 14, the motor 7 is stopped. Temp. is calculated by a temp. measuring device 13 to be inputted to the PCU 15 and, when measurement is finished, the motor 7 is reversed by the PCU 15 to draw up the probe 3. By this method, a thermometric position is precisely indicated by a simple mechanism and the stop time of the probe 3 is automatically controlled most suitably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to reducing the temperature of molten steel in the ladle to 1 in an external refining furnace.
The present invention relates to a position control device for an API temperature probe suitable for use in a temperature probe to measure temperature.

[Prior Art] For example, in an external refining furnace, it is necessary to heat molten steel in a ladle to a required temperature, and the amount of heating is generally determined by measuring the temperature of the molten steel before heating.

If the temperature is not measured correctly here, there is a risk that the surface of the molten steel will rise to a high level due to overheating and damage the ladle, so a highly accurate 4P1 temperature is required.

Conventionally, the temperature of molten steel in a ladle has been measured as follows. That is, the temperature measuring probe of the thermometer aPI device is supported above the opening of the ladle by a probe support mechanism, and the temperature probe can be raised and lowered by an elevator (&) that raises and lowers the probe support mechanism, and the temperature probe is placed at a specific position of the elevator mechanism. In addition to providing a limit switch, a support mechanism (
A striker will be provided. Then, the support mechanism is moved in the downward direction by the lifting mechanism to lower the side temperature probe,
When it comes into contact with the striker switch of the support mechanism, the apl temperature probe stops descending and the temperature is measured. After a certain period of time has elapsed, the support mechanism is moved in the upward direction by the elevating mechanism to raise gp+i=nib lobe, and the operation is completed by stopping at the initial position.

[Problem 2f+ to be solved by the invention] As described above, conventionally, the stop position of the 1-1 temperature probe at 71PI temperature has been fixed by the mounting positions of the limit switch and the striker. For this reason, it is very difficult to vary the al temperature position in accordance with changes in the scene level within the ladle. When measuring the molten steel temperature by a total of ΔIII, if the temperature of the molten steel surface is not accurately adjusted to a total of 4P1, there is a risk of overheating due to overheating. Despite this, conventionally A
pl? Since the stop position when measuring temperature with the M probe was fixed, the temperature was measured in areas other than the molten steel, which sometimes caused accidents such as damage to the ladle due to overheating.

I installed 1M limit switches in parallel on the lifting mechanism and selected any one switch. It is possible to change the upper stop position of the J temperature probe at δ-1 temperature as appropriate, but in this case, multiple limit switches must be placed in close proximity, which complicates the configuration. Moreover, the cost also increases. Furthermore, minute position control is difficult.

In addition, conventionally, aPI? jA
After starting the process, the APL temperature probe was raised after a certain period of time had elapsed, and the time that the side temperature probe remained in the molten steel was constant. For this reason, depending on the conditions of the molten steel, the residence time may be too long and the dFI? There have been cases where the connector between the XiA probe and the support mechanism or the temperature measurement probe itself has been burned out, or the residence time has been too short and the temperature measurement probe has been pulled up before the iE L temperature measurement can be performed. Although it is possible for the operator to manually raise the temperature by looking at the fixed value of Ap1 on the thermometer Apl device, in this case the burden on the operator is large and it is inappropriate.

Therefore, the present invention has a simple and low-cost configuration that allows the stop position of the temperature measuring probe to be changed minutely and precisely when the temperature reaches 11 PI.
It is an object of the present invention to provide a position control device for a temperature measuring probe that can automatically control the stop time of the probe to an optimum time and that does not increase the burden on the operator.

[Ninth Means for Solving the Problems] The present invention includes a drive mechanism that reciprocates a 1lllJ temperature probe, and a position detection means that detects the position of the temperature probe that is driven in one direction by normal rotation of this drive mechanism. , a comparison means that compares the probe position detected by the position detection means and a preset temperature measurement position, and outputs a drive stop signal when the two positions match; and a drive stop signal outputted by the comparison means. A stop control means for controlling the forward rotation of the drive mechanism to be stopped in response to the 11111 temperature measurement signal from the temperature probe; and reversal control means.

[Operation] By taking such a measure, when the temperature measuring probe is driven in one direction by normal rotation of the drive mechanism, the position of the side temperature probe is detected by the position detection means, and the detected probe position A comparison is made between the Ill 1M position set in advance and the Ill 1M position set in advance. Then, when the two positions match, a drive stop signal is output, and in response to this drive stop signal, the normal rotation of the drive mechanism is stopped by the stop control means.

However, rl! 'I iM probe stops at the preset M1 temperature position (p) and temperature measurement starts. Thereafter, the drive mechanism is reversely controlled by the reversal control means in response to the temperature measurement signal from the temperature measurement probe. Therefore, when the n1 temperature ends, the ap+ temperature probe immediately moves in the opposite direction.

[Embodiment] An embodiment in which the position control device of the present invention is applied to a static 11 m probe for measuring the temperature of molten steel in a ladle will be described below.

FIG. 1 is a schematic diagram showing the overall configuration. In the figure, IJl is a ladle containing molten steel, and the level 2 of the molten steel is shown by a chain line. 3 is a temperature measuring probe, which is held by a holder 4. The holder 4 is one end of the lifting arm 5 The side temperature probe 3 is mounted perpendicular to the surface of the molten steel in a1, and the other end of the lifting arm 5 is connected to a lifting mechanism 6 consisting of a drive chain and a mast. The lifting mechanism 6 receives the rotational force of a reversible motor 7 via a reducer 9 attached to a motor shaft 8 and rotates forward or backward, thereby moving the lifting arm 5 perpendicular to the molten steel surface. When the elevating mechanism 6 rotates forward, the elevating arm 5 and eventually the i41 temperature probe 3 descend toward the molten steel, and when the elevating mechanism 6 reverses, the elevating arm 5 In addition, lungs 1
The hot probe 3 rises from the surface of the molten steel.

A pulse encoder 10 that generates a pulse (g) corresponding to the rotational speed of the motor is attached to the front 3ri hll motor tough motor shaft 8 via a coaxial reducer 11. A limit switch 12 is installed at this position, and is turned on when the lifting arm 5 is lowered to this specific position.1
3 is a thermometer 71Fl device for reading the temperature measurement signal from the nJ1iA probe 3. Reference numeral 14 denotes an operation console having a Δ-1 temperature start button, 11 temperature position setting value input section, etc. 15 is activated by inputting the 71$1 temperature start button from the operation console 14, and receives a pulse signal from the pulse encoder 10, an on/off signal from the limit switch 12, a temperature reading signal from the temperature measuring instrument 13, and operation. This is a programmable controller for programmatically controlling the rotation and stopping of the front 5-pin reversible motor 7 based on temperature measurement position set value information from the desk 14.

FIG. 2 is a functional block diagram of the programmable controller. The integrating unit 21 once clears the integrated value by the ON signal of the limit switch 12, and then integrates the pulse signal generated from the pulse encoder 10 again. The pulse conversion unit 22 converts the gpji=position setting value manually inputted using the operation unit 14 into the corresponding number of pulses. The comparison section 23 compares the cumulative number of pulses in the integration section 21 and the number of pulses set by the pulse conversion section 22, and outputs a drive stop signal when both numbers of pulses match. The motor control section 24 controls the rotation, reverse rotation, and stop of the reversible motor 7, and operates the apJ temperature thrust start signal from the operation section 14 to control the rotation, and receives the drive stop signal from the comparison section 23. In response to this, stop control is performed, and in response to a temperature reading signal 11-1 from temperature measuring device 13 or a reading error signal, reverse control is performed.

FIG. 3 shows program 1 of the programmable controller 15. It is a flow chart showing control operation. That is, when the temperature measurement start button on the console 14 is pressed, the flowchart starts, and the motor control unit 24 first selects aP1? Rotate the reversible motor 7 in the direction in which the m-probe 3 descends and wait for an ON signal from the limit switch 12. When the ON signal from the limit switch 12 is input, the integrating section 21 starts integrating the number of pulses generated from the pulse encoder 10. The integrated pulse number in the integrating section 21 is compared with the number of pulses corresponding to one /Ip1 temperature stage position setting value converted by the pulse converting section 22, and if the two pulse numbers match, the motor The control unit 24 causes the drive to stop f. The signal is output and the reversible motor 7 rotates or stops 1
do. After that, from the thermometer i11'l device 13, Δl11
When inputting temperature reading signal or reading error signal,
The motor control unit 24 rotates the reversible motor 7 in a direction in which the temperature measuring probe 3 rises, and this operation is completed when the reversible motor 7 is stopped after a predetermined period of time has elapsed.

In this embodiment configured in this way, the operation console 14
When the ailt temperature start button on the console 14 is turned on while inputting the 7JPj temperature position set value using the Then, when the limit switch 12 is turned on by the lifting arm 5, the number of pulses generated from the pulse encoder 10 is integrated by the integrating section 21, and this accumulated pulse number is converted by the pulse converting section 22. /IpI When the number of pulses corresponds to the set value of the stage position, the r+J reverse motor 7 is controlled to stop, and the descending of the 711 temperature probe 3, etc. is stopped. 1lI when the position where 12 is turned on is the reference position
This corresponds to the descending distance of the 11-temperature probe 3. I wanted to,
By predetermining the distance from the specific position where the limit switch 12 is installed to the level 2 of the molten steel in the ladle 1 using the API and inputting it as the temperature measurement position setting value from operation +-14, The probe 3 is controlled to stop 1' with good viscosity in the molten steel scene, making it possible to measure the scene temperature/Ip1.

And temperature, IIpf by il 1lP1 vessel 13
? : When the temperature reading signal from the i-probe 3 is correctly read, the reversible motor is reversely controlled in response to this temperature reading signal, and this causes the lowering mechanism 6 to reverse and move the lifting arm 5 and Δ1. The temperature probe 3 rises together with the temperature probe 3. Therefore, the temperature probe 3 accurately measures the scene temperature of the molten steel by πlA! Temperature probe 3 is raised immediately when I+ is applied. Therefore, problems such as the residence time being too long and causing burnout of the connector part between the temperature measuring probe 3 and the holder 4 and the temperature probe 3 itself, or conversely being too short and not being able to measure the correct temperature, are eliminated.

In this way, according to this embodiment, the 7Ip+ temperature probe 3 can be stopped at the 71p+ temperature position with good viscosity simply by setting the distance from the reference specific position to the temperature measurement position in advance. Therefore, there is no need for a complicated and expensive configuration in which many limit switches are placed close together.
The temperature measurement position of the m-probe 3 can be freely set, and the set position can also be changed within a minute range by simple manual operation. As a result, it is possible to keep track of changes in the molten steel surface level and keep the scene temperature accurate at all times, so there is no risk of accidents such as damage to the ladle due to overheating due to a 4-sand 1-temperature mistake. It disappears.

Further, according to this embodiment, when the temperature is measured correctly by the temperature probe 11-1, the temperature measurement probe 3 is immediately raised, so that the molten steel residence time of the temperature measurement probe 3 is optimized without operator supervision. Since the time can be automatically controlled, dl1 does not increase the burden on the operator.
1? ! It is possible to prevent burnout of the probe 3 and the like and dllll temperature errors.

In addition, in the above embodiment, the position control device of the present invention is applied to the /I-1 temperature probe whose position is controlled in the ascending and descending direction in order to measure the temperature of molten steel /Ip1, but the present invention is not limited to this. For example, the present invention can also be applied to the position control of the i1P+ temperature probe, which is moved back and forth in the direction of the water mold or by a drive mechanism.

[Effects of the Invention] As described in detail above, according to the present invention, the stop 1 position of the temperature measuring probe at Ipl ; It is possible to do r1J, and 7Ill+stop 1 of the warm probe.
- It is possible to provide a position control device for the 11111 temperature probe that can automatically control the time to the optimum time and that does not increase the burden on the operator.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams showing one embodiment of the present invention, in which Figure 1 is a schematic diagram showing the overall configuration, Figure 2 is a functional block diagram of the programmable controller, and Figure 3 shows the operation of the programmable controller. FIG. 3...Apl temperature probe, 4...Holder, 5...
Lifting arm, 6...Elevator +M, 7...rlJ reverse motor, 10...Pulse encoder, 12...Limit switch, 13...Thermometer 4111::::,1
4... 1.ψ making, 15... Programmable controller, 21... Accumulating section, 22... Pulse converting section,
2'3... Comparison section, 24... Motor control section. Figure 3

Claims (1)

[Claims] A drive mechanism that drives the temperature measurement probe back and forth, a position detection means that detects the position of the temperature measurement probe that is driven in one direction by normal rotation of this drive mechanism, and a probe position detected by the position detection means and a preset setting. comparing means for comparing the measured temperature position and outputting a drive stop signal when the two positions match, and controlling the forward rotation of the drive mechanism to be stopped in response to the drive stop signal output by the comparison means. It is characterized by comprising a stop control means, and an inversion control means for inverting the drive mechanism in response to a temperature measurement signal from a temperature measurement probe whose driving in one direction has been stopped by the stop control means. Temperature probe position control device.