JPH04356316A - Method for detecting water cooling nozzles being clogged - Google Patents

Abstract

PURPOSE:To automatically detect water cooling nozzles to cool hot rolled steel being clogged. CONSTITUTION:A sensor unit 2 on which pressure sensors 2a are arranged at the same interval as that of the water cooling nozzles is fitted with setting to the punched hole parts of a carrier plate, injected water pressure injected from the water cooling nozzles is detected by the pressure sensor 2a, this is stored in a memory 3c and contents of the stored pressure are stored in an IC card 3d. After the carrier plate passes through an injection water cooling area, the stored contents of the IC card 3d taken out of the memory 3c are operated by a personal computer 5 to be converted into an information signal and outputted. In this way, since a waveform indicating variation of pressure is obtained, how the water cooling nozzles are clogged can be detected by the height of this waveform.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is designed to easily detect the degree of clogging of a water cooling nozzle that injects cooling water to cool plate materials, especially in a thick plate accelerated cooling line or a hot rolled material cooling line in a steel factory. The present invention relates to a method for detecting clogging of a water cooling nozzle.

0002

[Prior Art] For example, in a steel factory, a large amount of cooling water is injected into a hot-rolled steel material immediately after hot rolling to accelerate cooling. Although 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 of the hot rolled steel material is extremely important for the quality of the rolled product.

[0003] As shown in FIG. 8, which is a schematic perspective view of the cooling line, such a cooling line is provided between two conveyor rolls 10 of the conveyor line that conveys the hot rolled steel material w. A lower nozzle header 12 provided with a plurality of lower water cooling nozzles 11d that inject cooling water is arranged parallel to these conveyor rolls 10.

Furthermore, an upper nozzle header 13 equipped with a plurality of upper water cooling nozzles 11u for spraying cooling water downward is arranged above the hot-rolled steel material w.
It has a configuration in which it is arranged parallel to the

[0005] Therefore, upper nozzle headers 13 are installed on the upper and lower surfaces of the hot-rolled steel material w to be transported on the transport line.
upper water cooling nozzle 11u and lower nozzle header 12
A predetermined amount of cooling water is injected from each of the lower water cooling nozzles 11d to cool the hot rolled steel material w according to the amount of cooling water injected, thereby manufacturing a rolled product having mechanical strength within a predetermined range. There is.

[0006]

[Problems to be Solved by the Invention] By the way, the above-mentioned upper and lower nozzle headers 13 and 12 differ depending on the equipment, but
For example, the length is 4 to 5 m, and the installation range in the conveying direction of the hot rolled steel material w is 15 to 20 m, and the total number of upper and lower water cooling nozzles 11u and 11d is several thousand.

The structure of the upper nozzle header 13, as shown in FIG. 9, which is an explanatory diagram of its cross-sectional structure, is such that the water pressure distribution in the length direction is kept constant and the upper water cooling nozzle 11u is shaped like an inverted U. It has a double pipe structure so that the water jetted from the top nozzle header 13 is all jetted at the same pressure, but because the flow rate of water in this upper nozzle header 13 is low, it mixes with the water. Dust etc. tend to settle and the upper water cooling nozzle 1
1u tends to be prone to clogging.

Furthermore, as shown in FIG. 10, which shows 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 pipe 14, the water from the supply pipe 14 can be adjusted. Because of the configuration in which water is supplied to the branch pipe 16 that distributes water to each nozzle header, the nozzle header 12
, 13, a pressure difference is likely to occur between them.

If either of the upper or lower water cooling nozzles is clogged due to this, a larger amount of cooling water is injected from the water cooling nozzle that is not clogged, but the water cooling nozzle has increased resistance due to the clog. The degree of clogging is further accelerated.

When this situation progresses, the amount of water jetted from the water cooling nozzle becomes unbalanced, causing uneven cooling of the hot-rolled steel material w, which not only makes it impossible to obtain the desired tensile strength, but also makes it impossible to obtain the desired tensile strength, for example. However, uneven cooling causes quality problems such as warping after strip cutting.

[0011] The clogging of the water cooling nozzle as explained above is determined by visual inspection by an operator or the like during non-rolling or non-cooling when the cooling line is stopped, and it may be incomplete. Because of the inefficiency and inefficiency, it has been desired to develop an excellent method for detecting clogging of water cooling nozzles.

By the way, Japanese Patent Application Laid-Open No. 109551/1983 (Netherlands) discloses a technique for detecting the state of spray using a piezo-type vibration detection element. However, such techniques are aimed at nozzles for cooling slabs in continuous casting, and are not suitable for application to water-cooling nozzles in rolling lines.

The reason why it is inappropriate to apply piezo-type vibration detection elements to rolling lines is that the distance between the nozzle for water cooling of the slab and the slab in continuous casting is about 10 to 20 mm. In the case of rolling lines, the distance between the water cooling nozzles and the steel plate is 1 to 2 m, and there are also differences in the number of water cooling nozzles installed between the two, as well as differences in the jetting conditions of the water jet. It can be understood that this is based on these differences.

That is, when the jet water flow from the water cooling nozzle 11 of the rolling line is detected by a piezo-type vibration detection element, the amplitude of the waveform is large as shown in FIG. changes corresponding to quantitative changes cannot be clearly detected.

On the other hand, when the jet water flow from the water cooling nozzle 11 of the rolling line is detected by the pressure detection sensor, the amplitude of the waveform is small, as shown in FIG. It can be seen that it corresponds extremely well to quantitative changes and can reliably detect such changes.

Accordingly, an object of the present invention is to provide a method for detecting clogging of a water cooling nozzle, which makes it possible to reliably and easily find a clogged nozzle by using a pressure detection sensor.

[0017]

[Means for Solving the Problems] The present invention has solved the above problems by finding that a change in the amount of water injected from a water cooling nozzle in a rolling line can be reliably identified as a pressure change by a pressure detection sensor. It is.

Therefore, the gist of the method for detecting clogging of a water cooling nozzle according to claim 1 is that the jet water jet from a plurality of water cooling nozzles is arranged at the same pitch as the water cooling nozzles in the jet cooling zone that cools the hot rolled plate material. a plurality of pressure detection sensors that receive water jets from the plurality of water cooling nozzles, a memory that temporarily stores signals from each pressure detection sensor, a battery that supplies power, and a control that controls these. A circuit is attached to a plate-like member and passed through the plate-like member, and during the passage, the injection pressure of cooling water injected from the upper and lower water cooling nozzle groups is converted into a pressure signal by the pressure detection sensor and stored in a memory, Further, after the plate member passes through the jet water cooling zone, the stored contents stored in the memory are transferred to a signal processing device provided outside, and the signal transferred by the signal processing device is converted into a knowledge signal and outputted. It is characterized by

The gist of the water cooling nozzle clogging detection method according to claim 2 is that the water cooling nozzles are arranged at the same pitch as the water cooling nozzles in the jet cooling zone that cools the hot rolled plate material by jetting water from a plurality of water cooling nozzles. and a plurality of pressure detection sensors that receive the jet water flow jetted from the plurality of water cooling nozzles;
A wireless transmitter that transmits pressure signals from each pressure detection sensor, a battery that supplies power, and a control circuit that controls these are attached to a plate-shaped member and passed through the plate-shaped member, and the・The injection pressure of cooling water injected from the lower water cooling nozzle group is converted into a pressure signal by the pressure detection sensor, and continues to be transmitted to a signal processing device provided outside by the wireless transmitter, and the signal processing device It is characterized by converting the received signal into a knowledge signal and outputting it.

The gist of the water cooling nozzle clogging detection method according to claim 3 is that in the water cooling nozzle clogging detection method according to claims 1 and 2, a plurality of pressure detection sensors are subjected to a plurality of processes. The processing units are divided into units, and each of these processing units is composed of a plurality of pressure detection sensor rows according to the combination row pattern of water cooling nozzles. After adding up the output signals from the pressure detection sensors, the average value is calculated, and the magnitude of the average value between the corresponding pressure detection sensor arrays forming each processing unit is compared to determine if the water cooling nozzle is clogged. It is characterized by determining.

[0021]

[Operation] According to the water cooling nozzle clogging detection method 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, so that The water pressure of the water jetted from the water cooling nozzle is detected as a pressure value by a pressure detection sensor,
After this is stored in the memory and the plate-like member passes through the jet water cooling zone, the stored contents of the memory are transferred to a signal processing device, which converts it into a detection signal and outputs it.

Further, according to the method for detecting clogging of a water cooling nozzle according to claim 2, while the plate member is passing through the jet water cooling zone, the pressure value of the jet water is transmitted outward as a pressure signal by a wireless transmitter. The signal continues to be transmitted to the signal processing device installed in the device, and is converted into a detection signal by the signal processing device and continues to be output.

[0023] Furthermore, the invention according to claim 3 is based on the above-mentioned claim 1.
The object of the present invention is to improve the practicality of the method for detecting clogging of a water cooling nozzle according to claim 2, and therefore, according to the method for detecting clogging of a water cooling nozzle according to claim 3, each pressure detection The detection signal detected from the sensor is processed by each corresponding pressure detection sensor row set constituting each processing unit, and then processed by each processing unit, and the detection signal between each pressure detection sensor row set is processed. Since the magnitude of the average value is compared between processing units to determine whether the water cooling nozzle is clogged, a large amount of data can be efficiently processed.

[0024]

[Embodiment] An example of a water cooling nozzle clogging detection device according to an embodiment of the present invention will be described below 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
This will be explained with reference to.

Reference numeral 1 shown in FIG. 1 designates a carrier plate 1 as a plate-like member having eye bolts 1b screwed to each of its four corners for hoisting with a crane or the like, and having a rectangular punch hole 1a. .

Pressure detection sensors 2a are arranged at the same intervals as the water cooling nozzles 11 across both longitudinal ends of the holes 1a of the carrier plate 1, and as shown in FIG. A sensor unit 2 is installed in which an amplifier 2b for amplifying the output of the sensor 2a is embedded.

Although details of the sensor unit 2 are not shown, pressure detection sensors 2a each having a diameter of 25 mm are arranged at a pitch of 50 mm in accordance with the rows of water cooling nozzles that are shifted by 25 mm for each row. The pressure detection sensor set on the upper side of one row and the pressure detection sensor set on the lower side of one row are arranged offset by half a pitch.

Note that the diameter of the pressure detection sensor 2a is 25
The reason for using mm is to obtain accurate output. In other words, if the diameter is too large, the detection output from the pressure detection sensor 2a will vary because it will receive not only the jet water flow jetted from the target water cooling nozzle but also the jet water jet jetted from other water cooling nozzles. This is because it occurs.

The measurement range of pressure detection by the pressure detection sensor 2a varies depending on the area of its pressure receiving part, but is in the range of 0.05 to 0.
．． Since a range of 25 MPa is sufficient, many types of pressure detection sensors, such as capacitance type sensors, can be used as pressure detection sensors.

A multiplexer 3a that switches the output of each pressure detection sensor 2a, a CPU 3b that converts the output of each pressure detection sensor 2a into a pressure signal, and this CPU 3
The recording device 3 includes a memory 3c for storing the output of the output signal b, which is housed inside a waterproof box, and a DC/DC converter 4.
The configuration is such that a power supply unit 4 that supplies power from a battery 4b via a is placed on a carrier plate 1.

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

The working mode of the detection device having the above structure will be explained below. First, the carrier plate 1 is moved by a roller table having a plurality of transport rolls 10 arranged, for example, as shown in FIG.
A predetermined speed (0.7 to 1.0
m/s).

Then, the pressure detection sensor 2a receives the injection water pressure being injected from the water cooling nozzle 11 under the maximum water flow condition, and this is converted into pressure fluctuation by the CPU 3b.
Then, it is stored in the memory 3c and the IC card 3
recorded in d. Note that the conveyance speed of the carrier plate 1 is 0.7
~1.0 m/s was determined by trial and error, and with this, 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 and the IC card 3d is removed from the memory 3c.
The contents recorded by the C card 3d are calculated by the personal computer 5, and as shown in FIG.
is output to.

Among these waveforms 6, a portion with a high wave means that the pressure detection sensor 2a has received a predetermined injection water pressure from the water cooling nozzle 11, while a portion with a low wave 6a
Since this means that the injection water pressure is low, it means that the water cooling nozzle 11 is clogged, and the clogged water cooling nozzle 11 is identified by the number of waves in the waveform 6.

It is also possible to arrange the pressure detection sensors 2a in the sensor unit 2 over the entire length of the nozzle header, but this would impose a heavy economic burden, so the length of the sensor unit 2 may be shortened and the pressure detection sensors 2a may be arranged in the jet water cooling zone. The carrier plate 1 is shifted in the width direction of the conveyance roll and passed through it multiple times.

In this way, even though the carrier plate 1 is passed through multiple times, it is possible to detect a problem with the water jet from the water cooling nozzle in a much shorter time than the conventional silent inspection. did it.

In the past, workers and the like had to visually check the injection status, which was often extremely inaccurate, but now it is possible to detect a clogged water cooling nozzle 11 simply by comparing the heights of the waveforms 6. This makes it possible to obtain extremely accurate findings.

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

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

By the way, such a device does not necessarily require a memory or a proximity switch 7. However, the memory is designed to take into account transmission problems caused by wireless transmitters, and the proximity switch 7
Since the water cooling nozzle is disposed between the conveyor rolls, this is to make it possible to reliably know the position of the water cooling nozzle.

Next, another embodiment of a water cooling nozzle clogging detection device will be described below. In this embodiment, pressure detection sensors 2a are arranged in the sensor unit 2 over the entire length of the nozzle header. It has an added function that automatically determines the degree of clogging of the water cooling nozzle.

As in the above embodiment, the sensor unit 2 in this case is arranged as shown in the plan view of FIG.
Pressure detection sensors 2a having a diameter of 25 mm are arranged at a pitch of 50 mm, and the pressure sensor set on the upper side of one row and the pressure sensor set on the lower side of one row are arranged half a pitch apart.

[0044]The four pressure detection sensors 2a, two adjacent each of the upper pressure detection sensor row and the lower pressure detection sensor row, form one pressure detection sensor row set of three pressure detection sensor row sets. a, b, and c are configured.

Note that the number of pressure detection sensors 2a constituting the pressure detection sensor row set is not limited to four, but may be a multiple of four in view of the arrangement of the water cooling nozzles. However, if the number is too large, it becomes difficult to identify each pressure detection sensor, so it is preferable to set the number to about 20 or less.

Further, in this case, one processing unit A is constituted by three pressure detection sensor arrays a, b, and c, and similarly, processing units B, C, and C each have the same configuration as processing unit A. ..., a processing unit X is configured.

Now, four pressure detection sensors 2a each constitute pressure detection sensor arrays a, b, and c of processing unit A.
respectively a-1 to a-4, b-1 to b-4, c-1 to
When their output waveforms are illustrated as c-4, as shown in FIG. -4 are output as pulse-like waveforms 6 separated by a predetermined time interval.

In order to display this for each pressure detection sensor 2a as in the above embodiment, it is necessary to instantly record the same number of signals as the number of water cooling nozzles (160 in this case), and the number of input points must be Not only is this impractical when you think about it, but the large number of signals makes it impractical both for displaying data after recording and for using this data.

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

As shown in FIG. 6, the signal processing device 8 is composed of a converter 8a, an adder 8b, and a divider 8c, so that the analog signal of the detection value detected by each pressure detection sensor is is input to the adder 8b via the converter 8a, and 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 the figure. This data is then input to a recording/diagnosis device 9 consisting of a portable box with a built-in personal computer.

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

[0052] In this way, since the output is summarized for each processing unit, it is extremely easy to display and use the data after recording. It is possible to reliably measure the amount of water injected from the water cooling nozzle over the entire longitudinal direction of the nozzle header, and it is also possible to reliably adjust the distribution of the amount of water injected from the water cooling nozzle over the entire length of the nozzle header, resulting in better maintenance of the entire cooling line. And now it can be done quickly.

In addition to the above-mentioned effects, since the amount of water jetted from the water cooling nozzle can be reliably measured, the amount of water jetted is less wasted, and the amount of cooling water used can be reduced. It has been recognized that this method has a significant effect, and it has become extremely advantageous economically in terms of the amount of cooling water used.

[0054]

As described in detail above, according to the water cooling nozzle clogging detection method according to claims 1 and 2, when the plate member is passed through the jet water cooling zone, the water cooling nozzle ejects the water from the water cooling nozzle. The water pressure of the jetted water is detected by the pressure detection sensor as a pressure value, which is converted into a detection signal by the signal processing device and continues to be output. This eliminates the need for incomplete and inefficient work such as visual inspection and judgment by personnel.

Furthermore, according to the method for detecting clogging of a water cooling nozzle according to claim 3, detection signals detected by a large number of pressure detection sensors are efficiently processed, resulting in improved data processing ability and practicality. It is effective against.

Therefore, according to the present invention, clogging of the water cooling nozzle can be promptly dealt with, thereby reducing quality defects such as tensile strength and warping of hot rolled steel products due to uneven cooling. Therefore, it can be expected to have an extremely large effect on improving the quality and productivity of rolled products.

[Brief explanation of the drawing]

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

FIG. 2 is a system block diagram of the water cooling nozzle clogging detection device shown in FIG. 1;

FIG. 3 is an explanatory diagram of an output state.

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

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

FIG. 6 is an explanatory diagram of output status.

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

FIG. 8 is a perspective view schematically illustrating the configuration of a cooling line.

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

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

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

[Explanation of symbols]

1...Carrier plate, 1a...pull hole, 1b...eye bolt, 2
...sensor unit, 2a...pressure detection sensor, 2b...amplifier, 3...recording device, 3a...multiplexer, 3b...CP
U, 3c...Memory, 3d...IC card, 3e...Antenna, 4...Power supply unit, 4a...DC/DC converter, 4
b... Battery, 5... Personal computer, 6... Waveform, 7... Proximity switch, 8... Signal processing device, 8a... Converter, 8b... Adder, 8c... Divider, 9... Signal processing device, 10... Conveyance roll, 11 ...Water cooling nozzle, 12...Lower nozzle header, 1
3... Upper nozzle header, 14... Supply source pipe, 15... Flow rate adjustment valve, 16... Branch pipe, A, B, C, X... Processing unit,
a, b, c...pressure detection sensor row set, w...hot rolled steel material.

Claims (3)

[Claims] [Claim 1] A jet water cooling zone that cools hot rolled plate material by jetting water from a plurality of water cooling nozzles is arranged at the same pitch as the water cooling nozzles, and the jet water jets jetting from the plurality of water cooling nozzles are disposed at the same pitch as the water cooling nozzles. A plurality of pressure detection sensors that receive pressure, a memory that temporarily stores signals from each pressure detection sensor, a battery that supplies power, and a control circuit that controls these are attached to a plate-shaped member and passed through. The injection pressure of the cooling water injected from the upper and lower water cooling nozzle groups is converted into a pressure signal by the pressure detection sensor and stored in the memory, and further stored in the memory after the plate member passes through the injection water cooling zone. A method for detecting clogging of a water cooling nozzle, characterized in that stored contents are transferred to a signal processing device provided outside, and the signal transferred by the signal processing device is converted into a knowledge signal and outputted. [Claim 2] A jet water cooling zone that is jetted from a plurality of water cooling nozzles to cool the hot rolled sheet material is arranged at the same pitch as the water cooling nozzles, and receives jet water jets jetted from the plurality of water cooling nozzles. a plurality of pressure detection sensors; a wireless transmitter that transmits pressure signals from each pressure detection sensor;
A battery for supplying electric power and a control circuit for controlling these are attached to a plate-shaped member, and the injection pressure of cooling water is injected from the upper and lower water cooling nozzle groups while passing through the plate-shaped member. is converted into a pressure signal by the pressure detection sensor, and continues to be transmitted to a signal processing device provided outside by the wireless transmitter, and the signal received by the signal processing device is converted into a knowledge signal and output. A method for detecting clogging of water cooling nozzles. 3. The plurality of pressure detection sensors are divided into a plurality of processing units, and these processing units are configured to be composed of a plurality of pressure detection sensor rows according to the combination row pattern of the water cooling nozzle. For each processing unit, calculate the average value after adding the output signals from the corresponding pressure detection sensors of each pressure detection sensor array group, and calculate the average value between the corresponding pressure detection sensor arrays forming each processing unit. 3. The method for detecting clogging of a water cooling nozzle according to claim 1, wherein clogging of the water cooling nozzle is determined by comparing the magnitudes of the average values.