JPH0771688B2 - Method for detecting clogging of water cooling nozzle - Google Patents

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can easily find out the degree of clogging of a water cooling nozzle for injecting cooling water for cooling a plate material in a thick plate accelerated cooling line or a hot rolled material cooling line in a steelmaking plant. The present invention relates to a method for detecting clogging of a water cooling nozzle.

[0002]

2. Description of the Related Art For example, in an iron mill, accelerated rolling is performed by injecting a large amount of cooling water onto a hot rolled steel material immediately after hot rolling, and the tensile strength of an alloy steel is lost with a normal Fe--C type material. We manufacture product steel sheets with no tensile strength,
Since the tensile strength of this product steel sheet is determined by the cooling rate and cooling history of the hot rolled steel material, the quality of cooling the hot rolled steel material is extremely important for the quality of the rolled product.

Such a cooling line is, as shown in FIG. 8 of a schematic configuration explanatory perspective view thereof, upward between the transfer rolls 10 of the transfer line for transferring the hot rolled steel material w. Multiple lower water cooling nozzles 11 for spraying cooling water
A lower nozzle header 12 provided with d is arranged in parallel with these transport rolls 10.

Further, an upper nozzle header 13 having a plurality of upper water cooling nozzles 11u for injecting cooling water downward is disposed above the hot rolled steel material w in parallel with the transport rolls 10. It is configured.

Therefore, a predetermined amount is respectively supplied from the upper water cooling nozzle 11u of the upper nozzle header 13 and the lower water cooling nozzle 11d of the lower nozzle header 12 to the upper and lower surfaces of the hot-rolled steel material w conveyed on the conveying line. The hot rolled steel material w is cooled in accordance with the injection amount of the cooling water to produce a rolled product having a mechanical strength within a predetermined range.

[0006]

By the way, although the upper and lower nozzle headers 13 and 12 differ depending on the equipment, for example, the length thereof is 4 to 5 m, and the arrangement range of the hot rolled steel material w in the conveying direction is The length is 15 to 20 m, and the total number of upper and lower water cooling nozzles 11u and 11d reaches several thousand.

The upper nozzle header 13 has an inverted U-shaped upper water cooling nozzle which maintains a constant water pressure distribution in the longitudinal direction, as shown in FIG. 9 of the sectional structure explanatory view.
The water jetted from 11u has a double pipe structure so that all the jetted water is jetted at the same pressure. However, since the flow velocity of water in the upper nozzle header 13 is low, it is mixed in the water. The dust and the like that are present tend to settle and the upper water cooling nozzle 11u tends to be clogged.

Further, as shown in FIG. 10 of the water supply piping system diagram for the nozzle headers 12 and 13, by adjusting the flow rate control valve 15 interposed in the supply source pipe 14, this supply source pipe
Since the water is supplied from the nozzle 14 to the branch pipe 16 that distributes the water to the nozzle headers, a pressure difference easily occurs between the nozzle headers 12 and 13.

When any of the upper and lower water cooling nozzles is clogged as described above, a larger amount of cooling water is jetted from the water cooling nozzle that is not clogged, while the water cooling nozzle has increased resistance due to clogging. The degree of clogging is further accelerated.

When such a situation progresses, the amount of water sprayed from the water cooling nozzle becomes unbalanced and uneven cooling occurs in the hot rolled steel material w, so that not only a predetermined tensile strength cannot be obtained, but also a thick plate material, for example. However, there are quality problems such as warping after stripping due to uneven cooling.

The degree of clogging of the water cooling nozzle as described above is judged by an operator visually inspecting during non-rolling or non-cooling when the cooling line is stopped, and it is incomplete. Since it is also inefficient, the development of an excellent clogging detection method for water cooling nozzles has been desired.

By the way, Japanese Patent Application Laid-Open No. 55-109551 (Netherlands) discloses a technique for detecting the spray state of a spray using a piezo-type vibration detecting element. However, such a technique is intended for a slab cooling nozzle in continuous casting and is not suitable for being applied to a water cooling nozzle of a rolling line.

Inappropriate application of the piezo-type vibration detecting element to the rolling line means that the space between the water cooling nozzle of the slab and the slab is about 10 to 20 mm in continuous casting. In the case of a rolling line, the distance between the water cooling nozzle and the steel plate is 1 to 2 m, and the difference in the number of water cooling nozzles between the two and the difference in the jetting condition of the jet water. Yes, and can be understood to be based on these differences.

That is, when the jet water flow from the water cooling nozzle 11 of the rolling line is detected by the piezo-type vibration detecting element, the amplitude of the waveform is large as shown in FIG. The change corresponding to the quantitative change of can not be clearly detected.

On the other hand, a water cooling nozzle of a rolling line
When the jet water flow from 11 is detected by the pressure detection sensor, the amplitude of the waveform is small as shown in FIG. 11b of the waveform detected by the pressure detection sensor, which corresponds very well to the quantitative change of the jet water flow and It turns out that it can be detected reliably.

Therefore, it is an object of the present invention to provide a clogging detection method for a water cooling nozzle that can reliably and easily find a clogging nozzle by using a pressure detection sensor.

[0017]

The present invention has solved the above problems by finding that a change in the amount of water injected from a water cooling nozzle of a rolling line can be reliably identified as a pressure change by a pressure detection sensor. Is.

[0018] Accordingly, the gist of the clogging detection method of the water-cooled nozzle according to claim 1, the injection water cooling zone is injected from a plurality of water-cooled nozzles to cool the hot-rolled sheet, said plurality of <br/> water cooling A plurality of pressure detection sensors, which are arranged at the same pitch as the water nozzles and receive the jets of water jetted from the plurality of water cooling nozzles, are mounted in alignment with the openings of the vent holes.
To a position deviated from該抜-out hole, a memory for temporarily storing the signals from the pressure detection sensor, a battery for supplying power, and a control circuit for controlling the formed by attached
It passes through a plate-shaped member having a hole, and the pressure of the cooling water sprayed from the upper and lower water-cooling nozzle groups during the passage of the plate-shaped member is converted into a pressure signal by the pressure detection sensor and stored in a memory. After the plate-shaped member passes through the water jet cooling zone, the stored content stored in the memory is transferred to a signal processing device provided outside, and the signal transferred by the signal processing device is converted into a knowledge signal. It is characterized by outputting.

Further, the gist of the method for detecting clogging of a water cooling nozzle according to a second aspect of the present invention is to provide a plurality of water in a jet water cooling zone which is jetted from a plurality of water cooling nozzles to cool a hot rolled sheet material. Roll position detection that detects the position of the pressure rolls and the pressure detection sensors that are arranged at the same pitch as the cooling nozzles and that receives the jets of water jetted from these water cooling nozzles.
And the device is attached according to the opening of the vent hole,
A position deviated from該抜-out hole, and a wireless transmitter for transmitting a roll position signal from the pressure signal and a roll position detector from the pressure detection sensor, a battery for supplying power, and a control circuit for controlling them is Has a vent hole attached
Through the plate-shaped member, the injection pressure of the cooling water injected from the upper and lower water-cooling nozzle groups during the passage of the plate-shaped member is converted into a pressure signal by the pressure detection sensor, and by the wireless transmitter. It is characterized in that the signal is continuously transmitted to the signal processing device provided outside, and the signal received by the signal processing device is converted into a knowledge signal and output.

Further, the gist of the method for detecting clogging of a water cooling nozzle according to claim 3 is that in the clogging detection method for a water cooling nozzle according to claims 1 and 2, a plurality of pressure detecting sensors are used for a plurality of processes. Each processing unit is divided into units, and each processing unit is configured to include a plurality of pressure detection sensor row sets corresponding to the combination row pattern of water cooling nozzles, and each of these plurality of processing units corresponds to each pressure detection sensor row set. The average value is obtained after adding the output signals from the pressure detection sensors, and the clogging of the water cooling nozzle is performed by comparing the magnitudes of the average values between the corresponding pressure detection sensor row sets constituting the respective processing units. Is determined.

[0021]

According to the method for detecting clogging of the water cooling nozzle according to claim 1 of the present invention, when the plate member is passed through the jet water cooling zone, at least the arrangement pitch of the water cooling nozzle and the pressure detection sensor is the same. After the water pressure of the jet water jetted from each water cooling nozzle of the upper and lower water cooling nozzle groups is detected as a pressure value by the pressure detection sensor, this is stored in the memory and the plate-shaped member passes through the jet water cooling zone. The stored contents of the memory are transferred to the signal processing device, which converts the detection signal into a detection signal and outputs the detection signal.

According to the method for detecting clogging of the nozzle for water cooling according to the second aspect, while the plate member is passing through the jet water cooling zone, the upper and lower portions are continuously detected by the pressure detection sensor.
The pressure value of the water sprayed from the cooling water nozzles of the cooling water nozzle group is used as a pressure signal and the roll position is detected.
The roll position detection value from the container is continuously transmitted as a roll position signal to a signal processing device provided outside by a wireless transmitter, and is continuously converted into a detection signal by the signal processing device and continuously output.

The invention according to claim 3 is the above-mentioned claim 1.
The object of the present invention is to improve the practicality of the clogging detection method for the water cooling nozzle according to claim 2 and, therefore, according to the clogging detection method for the water cooling nozzle according to claim 3, the respective pressure detections are performed. The detection signal detected from the sensor is processed for each corresponding pressure detection sensor row set constituting each processing unit, and then for each processing unit, and between each pressure detection sensor row set. Since the magnitude of the average value is compared between the processing units and the clogging of the water cooling nozzle is determined, a large amount of data can be efficiently processed.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An example of a clogging detection device for a water cooling nozzle according to an embodiment of the present invention will now be described with reference to FIG. 1 which is a perspective view thereof, FIG. 2 which is a system block diagram thereof shown in FIG. Figure 3
It will be explained with reference to and.

Reference numeral 1 shown in FIG. 1 is a carrier plate 1 as a plate member having eye holes 1b for lifting with a crane or the like, which are respectively screwed around four corners, and having a rectangular hole 1a. .

The pressure detecting sensor 2a extends over both ends of the hole 1a of the carrier plate 1 in the longitudinal direction, and the pressure detecting sensor 2a extends over the water cooling nozzle 11.
The sensor unit 2 is arranged at the same intervals as the above, and is embedded with an amplifier 2b for amplifying the output of the pressure detection sensor 2a as shown in FIG.

Although details of the sensor unit 2 are omitted in the drawing, the pressure detection sensors 2a having a diameter of 25 mm are arranged at a pitch of 50 mm in accordance with the row set of water cooling nozzles which are offset by 25 mm for each row. The upper row pressure detection sensor group and the lower row pressure detection sensor set are arranged in a half pitch.

The diameter of the pressure detecting sensor 2a is 25 mm.
The reason is to obtain accurate output. In other words, if the diameter is too large, in addition to the jet water flow jetted from the target water cooling nozzle, the jet water flow jetted from the other water cooling nozzles also receives, so there is variation in the detection output from the pressure detection sensor 2a. Because it will occur.

The pressure detection of the pressure detection sensor 2a is different from the measurement range depending on the area of the pressure receiving portion, but is 0.05 to 0.
Since the range of 25 MPa is sufficient, many types such as a capacitance type sensor can be used as the pressure detection sensor.

A multiplexer 3a for switching the output of each pressure detection sensor 2a, a CPU 3b for converting the output of each pressure detection sensor 2a into a pressure signal, and a memory 3c for storing the output of this CPU 3b are provided inside the waterproof box. The recording device 3 thus constructed is also configured such that the power source unit 4 for supplying the electric power of the battery 4b via the DC / DC converter 4a is placed on the carrier plate 1.

These devices are operated by the electric power supplied from the power supply unit 4, and the pressure value stored in the memory 3c is recorded in the IC card 3d by transmitting the output of the sensor unit 2 to the recording device 3. In addition to the above, a personal computer 5 that outputs the recorded pressure value to the CRT, which is calculated by the IC card 3d, is installed outside.

The mode of operation of the detection device having the above-described structure will be described below. First, the carrier plate 1 is moved by a roller table formed by arranging a plurality of conveying rolls 10 to a predetermined speed, for example, on the left side in the arrow direction in FIG. 0.7-1.0m
/ S) to move.

By the way, the pressure detection sensor 2a receives the water pressure of the water jetted from the water cooling nozzle 11 under the maximum water amount condition, this is converted into pressure fluctuation by the CPU 3b, and stored in the memory 3c and stored in the IC card. Recorded in 3d. In addition, the carrier speed of the carrier plate 1 is 0.7 to 1.0 m.
/ S is determined by trial and error, and thus a sufficient spatial resolution can be obtained.

When the carrier plate 1 passes through the jet water cooling zone, the IC card 3d is taken out from the memory 3c, the recorded contents by the IC card 3d are calculated by the personal computer 5, and the waveform 6 as shown in FIG. Is output to the CRT.

Among the waveforms 6, a wave having a high wave means that the pressure detection sensor 2a has received a predetermined jet water pressure from the water cooling nozzle 11, while a portion 6a having a low wave has a low jet water pressure. It means that the water cooling nozzle 11 is clogged, but the clogged water cooling nozzle 11
Is specified by the number of waves in waveform 6.

The sensor unit 2 has a pressure detection sensor.
2a may be arranged over the entire area of the nozzle header in the longitudinal direction, but this causes a large economic burden, so that the length of the sensor unit 2 is shortened and the carrier plate 1 is displaced in the jet water cooling zone in the width direction of the transport roll. I tried to pass it multiple times.

As described above, even though the carrier plate 1 is passed through a plurality of times, it is possible to detect an injection defect of the injection water flow from the water cooling nozzle in a much shorter time as compared with the conventional inspection by visual inspection. did it.

In the past, there were many cases in which it was extremely inaccurate because the operator or the like visually observed the jetting condition. However, by comparing the heights of the waves of the waveform 6, the nozzle 11 for water cooling, which is clogged, is It is possible to find out extremely accurately.

Next, a clogging detection device for a water cooling nozzle according to another embodiment of the present invention will be described with reference to FIG. 4 which is a perspective view thereof.
The reference numeral 3e shown in the figure is an antenna, and the reference numeral 7 connected to the recording device 3 is an eddy current sensor for detecting the position of the transport roll. Is a proximity switch which is a roll position detector .

Therefore, the pressure signal of the jet water pressure from the pressure detection sensor 2a and the position signal of the transport roll from the proximity switch, which are stored in the memory, are transmitted from the wireless transmitter via the antenna 3e. The data is received by (not shown) and calculated by the personal computer, and the result is displayed as a waveform on the CRT. In this case, it is superior to the above embodiment in that the clogging degree of the water cooling nozzle can be detected in real time.

By the way, the memory and the proximity switch 7 are not necessarily required for such a device. However, regarding the memory, the problem of the transmission by the wireless transmitter is taken into consideration, and regarding the proximity switch 7, since the water cooling nozzle is arranged between the transport rolls, the position of the water cooling nozzle can be reliably detected. This is because it is possible to do it.

Next, another embodiment of the clogging detection device for the water cooling nozzle will be described below. In this embodiment, the pressure detection sensor 2a is arranged in the sensor unit 2 over the entire area in the longitudinal direction of the nozzle header. A function to automatically judge the degree of clogging of the water cooling nozzle is added.

In this case, the sensor unit 2 has a diameter of 25 mm, as shown in FIG. 5 of the plan view, in accordance with the row set of water cooling nozzles that are offset by 25 mm for each row, as in the above embodiment. The pressure detection sensors 2a are arranged at a pitch of 50 mm, and the upper row of pressure sensor groups in one row and the lower row of pressure sensor groups in one row are arranged at a half pitch.

Then, three pressure detection sensor row sets are formed as one pressure detection sensor row set by the four pressure detection sensors 2a, each two adjacent two of the upper pressure detection sensor row and the lower pressure detection sensor row. a, b, c are configured.

The number of pressure detection sensors 2a constituting the pressure detection sensor array set is not particularly limited to four, but may be a multiple of four because of the arrangement of the water cooling nozzles. However, since it becomes difficult to specify each pressure detection sensor if the number is too large, it is preferable to set the number to about 20 or less.

Further, in this case, one processing unit A is composed of three pressure detection sensor array groups a, b and c, and processing unit B, processing unit C, which has the same structure as the processing unit A, and so on. ..., the processing unit X is configured.

[0047] Now, the pressure detection sensor row sets a processing unit A, b, a pressure detection sensor 2a four increments that constitute the c respectively _{-1 ~a -4, b -1 ~b -4} , c - _When these output waveforms are illustrated as _{1 to} c _-4, as shown in FIG. 6 of the output state explanatory diagram, these pressure detection sensors a _{-1 to} a _-4 , b.
Each of _{-1 to} b _-4 and c _{-1 to} c _-4 is output as a pulse-shaped waveform 6 with a predetermined time interval.

This is a pressure detection sensor as in the above embodiment.
In order to display every 2a, it is necessary to instantly record the same number of signals as the number of water cooling nozzles (160 in this case), and it is not realistic considering the number of input points, and the number of signals is large. Therefore, it is not practical to display the data after recording and to use this data.

Therefore, the processing unit A, the processing unit B, the processing unit C, ..., And the processing unit X are divided to facilitate the data processing. That is,
As shown in FIG. 7 of the output state explanatory diagram for each processing unit, the pressure detection sensors a _{-1 to} a _-4 , b _{-1 to} b _-4 , c _{-1 to} c.
The analog signal from _-4 is input to the signal processing device 8 having a configuration described later in each processing unit.

As shown in FIG. 6, the signal processing device 8 comprises a converter 8a, an adder 8b, and a divider 8c. Therefore, the analog signal of the detection value detected by each pressure detection sensor is used. Is input to the adder 8b via the converter 8a, then the signal input from the adder 8b is averaged by the divider 8c, and then output as a signal for each processing unit as shown in FIG. This is input to the recording / diagnosis device 9 which is a portable personal computer built-in box.

As shown in FIG. 7, the input signal for each processing unit output to the recording / diagnosis device 9 is a pulse-like waveform having a predetermined same pitch with the output of each processing unit. The magnitudes of the output waveforms between the corresponding sets of pressure detection sensor arrays of the unit are compared and recorded.

In this way, since the output gathered for each processing unit is obtained, it becomes very easy to display the data after recording and to use this data, and moreover, it is ejected from the water cooling nozzle. It is possible to reliably measure the water amount of the jet water flow to be sprayed, and it is also possible to reliably adjust the water amount distribution of the jet water flow jetted from the water cooling nozzle over the entire length of the nozzle header, resulting in good maintenance of the entire cooling line. Moreover, it can be done quickly.

In addition to the above effects, the amount of water jetted from the water cooling nozzle can be reliably measured, so that the waste of water jet is reduced and the amount of cooling water used is reduced. The effect was recognized, and the amount of cooling water used became extremely economically advantageous.

[0054]

As described in detail above, according to the method for detecting clogging of the nozzle for water cooling according to the first and second aspects, when the plate-shaped member is passed through the jet water cooling zone, the water cooling of the upper and lower portions is achieved. The water pressure of the water sprayed from the nozzle for use is simultaneously detected as a pressure value by the pressure detection sensor, and this is converted into a detection signal by the signal processing device and continues to be output. Eliminates the need for incomplete and inefficient work such as visual inspection and judgment by workers during non-cooling. Moreover, the water cooling nose according to claim 2.
According to the clogging detection method of the roll,
The position of the transport roll is specified by the roll position signal.
This allows you to identify the location of the lower water cooling nozzle.
Water, the direction of the jet water flow can be detected abnormally.
It can contribute to speeding up the maintenance work of the cooling nozzle.
It

Further, according to the clogging detection method of the water cooling nozzle according to the third aspect, the detection signals detected by the plurality of pressure detection sensors are efficiently processed, so that the data processing capacity and the practicality are improved. Is effective against.

Therefore, according to the present invention, the clogging of the water cooling nozzle can be dealt with promptly, so that the quality defects such as the tensile strength and the occurrence of warpage of the hot rolled steel material due to the uneven cooling can be reduced. Therefore, it is possible to expect an extremely great effect on the quality and productivity of rolled products.

[Brief description of drawings]

FIG. 1 is a perspective view of a clogging detection device for a water cooling nozzle according to an embodiment of the present invention.

FIG. 2 is a system block diagram of the clogging detection device for the water cooling nozzle shown in FIG.

FIG. 3 is an output state explanatory diagram.

FIG. 4 is a perspective view of a clogging detection device for a water cooling nozzle according to another embodiment of the present invention.

FIG. 5 is a plan view of a sensor unit of a clogging detection device for a water cooling nozzle according to another embodiment of the present invention.

FIG. 6 is an explanatory diagram of an output status.

FIG. 7 is an explanatory diagram of an output status for each block.

FIG. 8 is a schematic configuration explanatory perspective view of a cooling line.

FIG. 9 is an explanatory diagram of a cross-sectional configuration of an upper nozzle header.

FIG. 10 is a system diagram of a water supply piping to the nozzle header.

11A is an explanatory diagram of a waveform detected by a vibration detecting element, and FIG. 11B is an explanatory diagram of a waveform detected by a pressure detection sensor.

[Explanation of symbols]

1 ... Carrier plate, 1a ... Drilling hole, 1b ... Eye bolt, 2 ... Sensor unit, 2a ... Pressure detection sensor, 2b ... Amplifier, 3 ...
Recording device, 3a ... Multiplexer, 3b ... CPU, 3c ... Memory, 3d ... IC card, 3e ... Antenna, 4 ... Power supply unit, 4a ... DC / DC converter, 4b ... Battery, 5 ...
PC, 6 ... Waveform, 7 ... Proximity switch, 8 ... Signal processing device, 8a ... Converter, 8b ... Adder, 8c ... Divider, 9 ... Signal processing device, 10 ... Conveying roll, 11 ... Water cooling nozzle, 12 ... Lower nozzle header, 13 ... Upper nozzle header, 14 ... Supply pipe, 15 ... Flow control valve, 16 ... Branch pipe, A, B, C, X ... Processing unit, a, b, c ... Pressure detection sensor array set , W ... Hot rolled steel.

Claims (3)

[Claims] To 1. A jetting water cooling zone is injected from a plurality of water-cooled nozzles to cool the hot-rolled sheet is disposed in the plurality of water-cooled nozzles the same pitch, it is injected from the plurality of water cooling nozzles Multiple pressure detection sensors receiving jet flow
Is attached to the opening of the extraction hole and
A memory that temporarily stores the signal from each pressure detection sensor, a battery that supplies power, at a position away from the hole ,
A control hole for controlling these
Passed through a plate-like member having, - on the passing of the plate-like member
The stored content stored in the memory after the jet pressure of the cooling water jetted from the lower water cooling nozzle group is converted into a pressure signal by the pressure detection sensor and stored in the memory, and further after the plate-shaped member passes through the jet water cooling zone. Is transferred to a signal processing device provided outside, and the signal transferred by the signal processing device is converted into a knowledge signal and output, and the clogging detection method for a water cooling nozzle. To 2. A jetting water cooling zone is injected from a plurality of water-cooled nozzles to cool the hot-rolled sheet is disposed in the plurality of water-cooled nozzles the same pitch, it is injected from the plurality of water cooling nozzles Multiple pressure detection sensors receiving jet flow
And a roll position detector that detects the position of the transport roll
It is attached according to the opening of the extraction hole and
Pressure signal from each pressure detection sensor at a position outside the hole
A plate having a punched hole provided with a wireless transmitter for transmitting a roll position signal from the roll position detector, a battery for supplying electric power, and a control circuit for controlling these.
The Jo member is passed, the outer by the wireless transmitter converts the pressure signal by the pressure detecting sensor injection pressure of the cooling water sprayed from the water-cooled nozzle group of upper and lower during the passage of the plate-like member The method for detecting clogging of a nozzle for water cooling, characterized in that the signal received by the signal processing device is continuously transmitted to the signal processing device provided in the above, and the signal is converted and output. 3. A plurality of pressure detection sensors are divided into a plurality of processing units, and these processing units are constituted by a plurality of pressure detection sensor row sets corresponding to a combination row pattern of water cooling nozzles, For each of the processing units of, the average value is obtained after adding the output signals from the corresponding pressure detection sensor array of each pressure detection sensor array set, between each corresponding pressure detection sensor array set constituting each processing unit The method for detecting clogging of a water cooling nozzle according to claim 1 or 2, wherein the clogging of the water cooling nozzle is determined by comparing the magnitudes of the average values.