JP2020082110A - Sensor device, clogging detection device, and clogging detection method - Google Patents

Abstract

To provide a sensor device, a clogging detection device, and a clogging detection method capable of easily monitoring the clogging conditions of cooling sprays during operation, individually.SOLUTION: A sensor device is installed in a spray piping of cooling sprays used for continuous casting and detects the clogging of the tip part of each spray. The sensor device comprises: a thermocouple measuring the temperature of the spray piping; and a transmission chip transmitting the measured result of the thermocouple to a reception device.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sensor device, a clogging detection device, and a clogging detection method for detecting clogging of a cooling spray used in a bad environment where the ambient temperature is high, such as a secondary cooling spray of continuous casting of steel.

In the continuous casting of steel, the secondary cooling following the primary cooling in the mold is an important process for promoting the solidification of the slab, and the secondary cooling of the continuous casting involves cooling from multiple secondary cooling sprays. Water is jetted toward the slab. Since the slab is rapidly cooled in this manner, the tip of the secondary cooling spray is exposed to radiant heat from the slab, oxide scale separated from the casting surface, and the like. In addition, there are many factors that clog the tip of the secondary cooling spray, such as sticky substances secreted by algae that propagate in the cooling water system. On the other hand, when clogging occurs in the secondary cooling spray, the slab cannot be sufficiently cooled, which may cause a large problem such as delay in solidification of the slab and surface cracking.

Therefore, it is important to be able to detect clogging at the tip of the secondary cooling spray as soon as possible. Conventionally, as a method of detecting clogging of secondary cooling spray in continuous casting of steel, a method of estimating clogging from the relationship between pressure and flow rate in the spray pipe, such as the method described in Patent Document 1, As in the method described in Patent Document 2, a method of determining clogging from the sound of sprayed spray has been proposed.

JP, 2013-35027, A JP, 2005-131379, A

However, in the method described in Patent Document 1, it is only possible to estimate the clogging situation of a plurality of secondary cooling sprays existing in the flow rate control zone corresponding to one flow meter, and the clogging is detected by each secondary cooling spray. You cannot do it. Further, the method described in Patent Document 2 has a problem that the measurement cannot be performed unless the measuring device is passed through the continuous casting machine instead of the slab, and the situation during operation cannot be monitored.

In view of the above-mentioned problems, it is an object of the present invention to provide a sensor device, a clogging detection device, and a clogging detection method that can individually and easily monitor the clogging situation of a cooling spray during operation.

The present invention is as follows.
(1) A sensor device installed in a spray pipe of a cooling spray used in continuous casting, for detecting clogging of a tip portion of the cooling spray,
A thermocouple for measuring the temperature of the spray pipe,
A sensor device, comprising: a transmitter chip that transmits a measurement result of the thermocouple to a receiver device.
(2) Further, a sensor for detecting vibration caused by cooling water passing through the spray pipe is further provided,
The sensor device according to (1), wherein the transmission chip further transmits the vibration information of the detected vibration as a measurement result to the reception device.
(3) A sensor device for detecting clogging of a tip portion of the cooling spray, which is installed in a spray pipe of the cooling spray used in continuous casting,
A sensor for detecting vibrations due to cooling water passing through the spray pipe,
A sensor device, comprising: a transmission chip that transmits the vibration information of the detected vibration as a measurement result to a reception device.
(4) The sensor device according to any one of (1) to (3) above,
A receiving device for receiving the measurement result from the sensor device,
A clogging detection device, comprising: an information processing device that detects clogging of a tip portion for each cooling spray based on the received measurement result.
(5) A clogging detection method using a sensor device for detecting clogging of the tip portion of the cooling spray, which is installed in a spray pipe of the cooling spray used in continuous casting,
Measuring the temperature of the spray pipe using a thermocouple,
Transmitting the measurement result by the thermocouple from the sensor device,
Receiving the measurement result from the sensor device,
A clogging detection method for detecting clogging of a tip end for each cooling spray based on the received measurement result.
(6) The method further comprises the step of detecting vibrations caused by cooling water passing through the spray pipe by using an accelerometer or a microphone.
The clogging detection method according to (5) above, wherein in the transmitting step, the vibration information of the detected vibration is further transmitted as a measurement result.
(7) A clogging detection method using a sensor device for detecting clogging of a tip portion of the cooling spray, which is installed in a spray pipe of the cooling spray used in continuous casting,
Detecting vibrations due to cooling water passing through the spray pipe using an accelerometer or a microphone;
Transmitting the vibration information of the detected vibration from the sensor device as a measurement result,
Receiving the measurement result from the sensor device,
A clogging detection method for detecting clogging of a tip end for each cooling spray based on the received measurement result.

According to the present invention, it is possible to grasp the clogging situation for each cooling spray, so that it is possible to quickly respond, and it is possible to prevent defective quality and delay in solidification due to clogging of the cooling spray.

It is a figure which shows the structural example of the sensor unit for estimating the clogging situation of the cooling spray which concerns on embodiment of this invention. It is a figure which shows the external example of the cooling spray which attached the sensor unit of FIG. It is a figure for explaining the outline of the system which receives and manages a measurement result. It is a figure which shows the other structural example of the sensor unit for estimating the clogging situation of the cooling spray which concerns on embodiment of this invention. It is a figure for explaining details of a system which detects clogging in a cooling spray during operation. It is a block diagram showing an example of hardware constitutions of PC concerning this embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, on the premise that it is used in continuous casting, a thermocouple, an accelerometer, a microphone, etc., a sensor unit including a measurement module including a highly durable and compact sensor in which a movable part is not exposed is cooled. Each spray can be installed in the pipe, and the clogging status during operation can be estimated individually for all cooling sprays. In the receiving device, for example, one receiving module for every 100 measuring modules is installed in the partition wall of the continuous casting machine chamber, and a plurality of receiving modules are connected to a data logger outside the continuous casting machine chamber to collect information. Take

FIG. 1 is a diagram showing a configuration example of a sensor unit 10 for estimating a clogging situation of a cooling spray according to the present embodiment. Further, FIG. 2 is a diagram showing an external appearance example of the cooling spray 1 to which the sensor unit 10 of FIG. 1 is attached.
As shown in FIG. 1, the sensor unit 10 has an accelerometer 11, a thermocouple 12, a data processing chip 13, a transmission chip 14 and a battery 15 embedded therein, which are connected by a lead wire (not shown) to connect data and data. It is possible to exchange power and the like. Further, the sensor unit 10 is mainly made of resin, and the accelerometer 11, the thermocouple 12, the data processing chip 13, the transmitting chip 14 and the battery 15 are embedded in the resin in order to prevent intrusion of water. However, the thermocouple 12 has a partially exposed structure so as to be directly connected to the spray pipe 21 of FIG.

The accelerometer 11 acquires the vibration information of the spray pipe 21 of FIG. Further, the accelerometer 11 has a structure in which the movable part is not exposed from the sensor unit 10. The accelerometer 11 acquires vibration information for 1 second every minute during operation, and the vibration information is transmitted to the data processing chip 13. When the spray tip 22 which is the tip of the cooling spray 1 is not clogged, the cooling water flows in the spray pipe 21 to cause regular vertical vibration. However, when clogging occurs, the flow of the cooling water passing through the spray pipe 21 becomes poor, and the vibration in the vertical direction with respect to the spray pipe 21 becomes small, or irregular vibration occurs. The clogging can be detected by acquiring the vibration information of such different tendencies. Although an accelerometer is used in this embodiment, a microphone may be used.

The thermocouple 12 measures the surface temperature (electromotive force) of the spray pipe 21 for 1 second every minute, and the temperature information (electromotive force) is transmitted to the data processing chip 13. When the spray tip 22 is not clogged, the cooling water constantly flows through the spray pipe 21, so that the spray pipe 21 is maintained at a relatively stable temperature. However, when clogging occurs, the flow of cooling water through the spray pipe 21 becomes poor and the amount of water decreases, so that the surface temperature of the spray pipe 21 rises. By detecting such a temperature rise, clogging can be detected.

The data processing chip 13 converts the information obtained from the accelerometer 11 and the thermocouple 12 into a digital signal and sends the digital signal to the transmission chip 14. For example, the temperature is estimated based on the electromotive force measured by the thermocouple 12, and the temperature is converted into a digital signal as temperature information. Further, the data processing chip 13 adds ID information indicating the ID of the cooling spray 1 to the digital signal. The transmission chip 15 transmits data such as temperature information and vibration information to which ID information is added as a measurement result to a reception module described later. As a communication method, for example, Bluetooth (registered trademark) can be used. The battery 15 constantly supplies power to the data processing chip 13 and the transmission chip 14. As the battery 15, for example, a small battery having a life of about 1 year can be used, or a module for generating power by using the vibration of the spray pipe 21 or the temperature difference of the surroundings as an energy source may be combined.

Further, the closer the sensor unit 10 is attached to the spray tip 22 at which clogging occurs, the more accurately the measurement can be performed, but the closer it is to the radiant heat from the cast piece. Based on the above, it is preferable to mount the sensor unit within a range of 200 mm or more and 800 mm or less from the spray tip.

As described above, in the present embodiment, the thermocouple, which has excellent durability and requires a small amount of communication information, is used as a sensor for detecting clogging, so that clogging can be detected accurately and easily over a long period of time. be able to. In addition to the thermocouple, by additionally using an accelerometer or a microphone that captures vibration information of the spray pipe, the clogging detection accuracy can be further increased. In addition, the accelerometer and the microphone have excellent durability because the movable parts are not exposed and there are no bearings or sliding parts, so they can be measured for a long period of time. If an accelerometer or a microphone is additionally used together, the load on the battery increases, so these may not be provided. Further, in order not to make the shape of the sensor unit elongated, the accelerometer or the microphone may not be provided.

FIG. 4 is a diagram illustrating an example of the sensor unit 40 that does not include an accelerometer or a microphone.
In the case of the example shown in FIG. 4, the data processing chip 13 and the transmission chip 14 are embedded on both sides of the battery 15, respectively. In this example, the accelerometer is not included in the sensor unit 40. However, in the example shown in FIG. 1, the size of the sensor unit 10 was about 150 mm×50 mm×30 mm, whereas in the example shown in FIG. 4, the size of the sensor unit 40 was 80 mm×65 mm×50 mm. , A shape closer to a cube with a reduced length can be obtained.

Next, a method for detecting the presence or absence of clogging in a plurality of cooling sprays will be described in detail. FIG. 3 is a diagram for explaining the outline of the system that receives and manages the measurement result. As shown in FIG. 3, a plurality of cooling sprays are connected by a spray header 23, and measurement results such as temperature information are received from the receiving module 31 from the respective sensor units. In this embodiment, the measurement result is received from one receiving module for 100 sensor units by wireless connection by Bluetooth. The measurement result is held in the data logger 32, and the measurement result can be monitored by the personal computer (PC) 33.

FIG. 5: is a figure for demonstrating the detail of the system which detects the clogging in a cooling spray during operation.
As shown in FIG. 5, a plurality of cooling sprays 1 are installed between the support rolls, and cooling water is sprayed from the cooling sprays 1 toward the slab. A reception module 31 is installed in the chamber partition wall 52, and receives the measurement result from the sensor unit attached to each cooling spray. The reception module 31, the data logger 32, and the PC 33 are connected to each other by wire, and the data logger 32 and the PC 33 are installed in the operation room 50 at a remote place.

The measurement result of each cooling spray is input to the data logger 32 every one minute, and the measurement result of a fixed period is held. The PC 33 can display the measurement result of each cooling spray, and can display a warning when an abnormality occurs in the measurement result.

FIG. 6 is a block diagram showing a hardware configuration example of the PC 33. The PC 33 has a CPU 101, a RAM 102, a storage device 103, a display I/F 104, a ROM 105, a communication I/F 107, and an input device 108, and they are connected by a main bus 109. The CPU 101 reads the control program stored in the ROM 105 and executes various processes. The RAM 102 is used as a main memory of the CPU 101 and a temporary storage area such as a work area. The storage device 103 stores various data and various programs. The display I/F 104 outputs various information to a display device (not shown). The input device 108 has a keyboard and a mouse and receives various operations by an operator. The communication I/F 106 acquires the measurement result from the data logger 32 and temporarily stores it in the RAM 102.

In the present embodiment, when the measurement result is acquired from the data logger 32, the CPU 101 transfers the measurement result from the display I/F 104 to the display device and checks whether the measurement result is within the normal range. .. For example, it is checked whether the surface temperature of the spray pipe is kept below a threshold value. When the surface temperature of the spray pipe exceeds the threshold value, the CPU 101 reads the ID information added together with the measurement result, identifies the cooling spray in which the abnormality has occurred, adds the warning information, and transfers it to the display device. To do so. As a result, the operator can identify the occurrence of clogging and the cooling spray in which clogging has occurred in the display device.

When the measurement result also includes vibration information, the CPU 101 also checks whether or not the vibration in the vertical direction is kept above a threshold value. Then, the warning information may be transferred when an abnormality occurs in both the surface temperature and the vibration information, or the warning information may be transferred when at least one deviates from the threshold value. Further, specific gravity may be provided in the surface temperature and vibration information, and the evaluation value may be used to determine whether or not there is an abnormality.

As described above, according to the present embodiment, the thermocouple, which has excellent durability and requires a small amount of communication information, is used as a sensor for detecting clogging, and it is possible to measure each cooling spray. The clogging status of the cooling spray can be easily monitored individually. In the present embodiment, the measurement result of the thermocouple is essential to detect clogging of the tip of the cooling spray, but the measurement result of the thermocouple is not used, and the vibration measured by the accelerometer or microphone is used. The clogging of the tip of the cooling spray may be detected only from the detection result (measurement result).

10 Sensor Unit 11 Accelerometer 12 Thermocouple 13 Data Processing Chip 14 Transmitting Chip 15 Battery

Claims (7)

A sensor device for detecting clogging of the tip portion of the cooling spray, which is installed in a spray pipe of the cooling spray used in continuous casting,
A thermocouple for measuring the temperature of the spray pipe,
A sensor device, comprising: a transmitter chip that transmits a measurement result of the thermocouple to a receiver device. Furthermore, further comprising a sensor for detecting vibrations due to cooling water passing through the spray pipe,
The sensor device according to claim 1, wherein the transmission chip further transmits the vibration information of the detected vibration as a measurement result to the reception device. A sensor device for detecting clogging of the tip portion of the cooling spray, which is installed in a spray pipe of the cooling spray used in continuous casting,
A sensor for detecting vibrations due to cooling water passing through the spray pipe,
A sensor device, comprising: a transmission chip that transmits the vibration information of the detected vibration as a measurement result to a reception device. The sensor device according to claim 1,
A receiving device for receiving the measurement result from the sensor device,
A clogging detection device, comprising: an information processing device that detects clogging of a tip portion for each cooling spray based on the received measurement result. Installed in the spray pipe of the cooling spray used in continuous casting, a clogging detection method using a sensor device for detecting clogging of the tip of the cooling spray,
Measuring the temperature of the spray pipe using a thermocouple,
Transmitting the measurement result by the thermocouple from the sensor device,
Receiving the measurement result from the sensor device,
A clogging detection method for detecting clogging of a tip end for each cooling spray based on the received measurement result. Further, using an accelerometer or a microphone, there is a step of detecting vibration due to cooling water passing through the spray pipe,
The clogging detection method according to claim 5, wherein in the transmitting step, vibration information of the detected vibration is further transmitted as a measurement result. Installed in the spray pipe of the cooling spray used in continuous casting, a clogging detection method using a sensor device for detecting clogging of the tip of the cooling spray,
Detecting vibrations due to cooling water passing through the spray pipe using an accelerometer or a microphone;
Transmitting the vibration information of the detected vibration from the sensor device as a measurement result,
Receiving the measurement result from the sensor device,
A clogging detection method for detecting clogging of a tip end for each cooling spray based on the received measurement result.

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