CN1789951A - Method and apparatus for testing spraying characteristic of secondary cooling nozzle of continuous casting - Google Patents

Abstract

The invention discloses a method and device for testing the spray characteristics of a continuous casting secondary cooling nozzle. The steps are as follows: 1. Use a moving nozzle to spray water to a water spray quality sensor and a water spray impact pressure sensor at a collection point below during the movement ; 2. The water spray quality sensor and the water spray impact pressure sensor transmit the collected water spray volume and its increment and water spray impact pressure value to the computer in real time; 3. The computer calculates the collected water according to the set parameters and procedures The water flow density and impact pressure values of the points are obtained to obtain the nozzle water flow density distribution and impact pressure distribution diagram. The entire testing process of the present invention can be controlled by a computer. The tester is controlled to drive the nozzle to automatically return to the test point, automatically enter the test state, and automatically collect data for calculation, which greatly improves the automation of the operation, and one person can complete the test. The test results are directly printed out in the form of a report, and at the same time, the distribution diagram of the nozzle's water flow density distribution and impact pressure can be obtained after the test.

Description

Test method and device for spray characteristics of continuous casting secondary cooling nozzle

technical field

The invention relates to a performance detection method and a detection device of a continuous casting secondary cooling nozzle, which is suitable for detecting the water flow density distribution and impact pressure distribution characteristics of the air-water nozzle spray of the continuous casting secondary cooling nozzle.

Background technique

The continuous steel casting process is the cooling and solidification process of molten steel. It is a heat transfer process that takes away the superheat, solidification latent heat and waste heat of liquid steel in a suitable way to solidify molten steel into solid steel; The main measure is to take the above three kinds of heat away through external water cooling. In the cooling and solidification process of the continuous casting slab, the cooling and solidification in the secondary cooling zone is the central link of the slab solidification. Among the various heat transfer methods in the secondary cooling zone, the heat transfer between the nozzle spray water and the surface of the slab is the main and controllable one, which determines the output of the casting machine and the quality of the slab. Under certain conditions of continuous casting machine equipment and technology, the characteristics of the nozzle in the secondary cooling zone are the main factors affecting the heat transfer of the slab, and are also the basic parameters for designing a reasonable secondary cooling system. The secondary cooling of continuous casting has a significant influence on the quality of the slab. In the secondary cooling zone of continuous casting, the solidification of the slab is accelerated through nozzle cooling, and the surface temperature distribution of the slab can be controlled to meet the requirements of the process, preventing surface cracks and internal cracks of the slab. Therefore, accurate testing of nozzle spray characteristic parameters, mainly including water flow density distribution and impact pressure distribution, to ensure that the performance of nozzles used in actual production meets the design requirements is of great significance to continuous casting production and guarantee the quality of slabs.

At present, there are generally three methods for the quantitative detection of the water flow density distribution of the continuous casting secondary cooling nozzle at home and abroad. One is to use horizontal spraying, arrange densely arranged water collection ports in front of the nozzle, use hoses to guide the water flow into the water collection bottle, and then use a measuring cup to measure the water in the water collection bottle one by one, calculate the water flow density at each point, and get the water flow density distribution, this method takes a long time, the manual workload is large, and after several links, the data measurement accuracy is low; the second is that the measurement device uses a large number of sensors, each test point is equipped with a sensor, and the automatic detection is realized by the computer. The advantage is that the degree of automation of the system is increased and the workload is reduced, but the disadvantage is that the equipment investment is greatly increased, the maintenance work and maintenance costs are greatly increased, and at the same time, the data accuracy and comparability are affected due to the error between the water collector and the sensor itself The third is to still adopt the method of collecting water in the test tube, realize functions such as water collection, drainage, and adjustment of the initial position of the test through the switch of the electromagnetic valve connected to the lower part of the receiving tube, and the switch and sensor connected with the electromagnetic valve to collect The liquid level in the water pipe is measured, and the signal is input to the computer for automatic processing to obtain the water flow density distribution of the nozzle. The advantage of this method is that the entire system can measure the water volume in hundreds of water collection pipes with only two sensors, which is extremely The number of sensors has been greatly reduced, part of the equipment investment has been saved, and the measurement error between different sensors has been eliminated. However, there are still shortcomings such as complex water collection system, many electromagnetic valves, heavy maintenance workload and long testing time in the whole process.

The nozzle impact pressure distribution test uses multiple pressure sensors, and the computer automatically collects data to obtain the impact pressure distribution curve. The disadvantage of this test method is that there are many sensors, large investment, high maintenance work and maintenance costs, and there are also problems that the data accuracy and comparability are affected due to the errors between the sensors themselves.

In addition, the existing nozzle water flow density distribution and impact pressure distribution tests are all carried out on two different sets of devices, whether the determination of the two detection parameters can be completed on the same device, and at the same time overcome the shortcomings of the existing detection methods is an important aspect of the present invention. Problems to be solved by patents.

Contents of the invention

The object of the present invention is to address the deficiencies of the above-mentioned prior art, and propose a continuous casting secondary cooling nozzle spray characteristic detection device that automatically completes the detection of nozzle water flow density distribution and impact pressure distribution at the same time, adopts a movable nozzle and a fixed test point method . In order to realize the above-mentioned invention object, the technical scheme of the present invention is: continuous casting secondary cooling nozzle spray characteristic testing method, and its steps are:

(1), adopt mobile nozzle, spray water to the water spray quality sensor and the water spray impact pressure sensor that are arranged on the collecting point directly below this nozzle while moving;

(2), the water spray quality sensor and the water spray impact pressure sensor will collect the water spray volume and its increment and water spray impact pressure value of each unit time period collected, and transmit them to the computer in real time;

(3) According to the set parameters and procedures, the computer calculates the water flow density value and the impact pressure value of the collection point, and obtains the nozzle water flow density distribution and the impact pressure distribution map.

A device for realizing the method for testing the spray characteristics of the continuous casting secondary cooling nozzle as claimed in the above claims, comprising a device body, a nozzle 2 arranged on the device body, a water spray quality sensor and a water spray impact pressure sensor arranged on the test point, including A computer for testing software, water spray pipelines and gas pipelines; it is characterized in that: the nozzle is movable and driven by a power unit; the nozzle is set on the upper part of the water spray quality sensor and the water spray impact pressure sensor , facing the connection of the water spray quality sensor and the water spray impact pressure sensor; the data output lines of the water spray quality sensor and the water spray impact pressure sensor are connected to the input end of the computer;

The water spray quality sensor is composed of a water collection tank, a water storage tank and an electronic balance, the water collection tank is on the top, and the water storage tank is below, the water storage tank is arranged on the tray of the electronic balance, and the data output line of the electronic balance is connected with the input terminal of the computer ;

The water spray impact pressure sensor is composed of a pressure transmission rod, a water barrier and an electronic balance, the water barrier is set on the upper end of the pressure transmission rod, the lower end of the pressure transmission rod is in contact with the tray of the electronic balance, and the data output of the electronic balance The line is connected to the input terminal of the computer.

The invention adopts the method of moving the nozzle and fixing the test point to test the water flow density and the impact pressure at different injection positions of the nozzle. The system adopts the design of electromechanical integration. Two electronic balances are respectively installed at both ends of the device along the direction of water jetting, and the stepping motor drives the nozzle to move between these two points. While moving, the computer collects the increment of sprayed water volume and impact pressure at a fixed time step, and the water flow density of each collection point within the spray range can be calculated according to the increase in water flow quality. The entire test process can be controlled by a computer. The control tester drives the nozzle to automatically return to the test point, automatically enters the test state, and automatically collects data for calculation, which greatly improves the automation of the operation, and one person can complete the test. The test results are directly printed out in the form of a report, and at the same time after the test, the distribution diagram of the water flow density distribution and impact pressure of the nozzle can be obtained, and the experimental data and distribution graphics can be saved to the database. The distribution of water flow density under different nozzles and different conditions can be viewed in the database and compared to obtain nozzles and working conditions suitable for actual production.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described

Fig. 1 is a structural representation of the device of the present invention

Fig. 2 is the flow chart of the control program of the lower computer used in the inventive method

Fig. 3 is the control program flowchart of the upper computer used in the inventive method

Fig. 4 is the distribution diagram of water flow density distribution and impact pressure of the present invention

Detailed ways

The test method of the present invention, its steps are: 1, adopt mobile nozzle, spray water to the water spray quality sensor and the water spray impact pressure sensor that are arranged on the collecting point below this nozzle during moving; 2, spray water quality sensor and The water spray impact pressure sensor transmits the collected water spray volume and its increment and water spray impact pressure value in each unit time period to the computer in real time; 3. The computer calculates the collection point according to the set parameters and procedures. The water flow density and impact pressure values are used to obtain the nozzle water flow density distribution and impact pressure distribution diagram.

As shown in Figure 1, 1—device body, 2—nozzle, 3—water spray quality sensor, 4—water spray impact pressure sensor, 5—water collection tank, 6—water storage tank, 7—water pipe, 8—electronic balance, 9 —pressure transmission rod, 10—water barrier, 11—electronic balance, 12—computer

The test device of the present invention comprises a device body 1, a movable nozzle 2 arranged on the device body 1, a computer 12 containing test software, etc.; two test points A and B are selected in the device body 1, and the test point B is assumed as The water flow density value collection point is set with the water spray quality sensor 3, and the test point A is used as the water spray impact pressure value collection point, and the water spray impact pressure sensor 4 is set; the data output line of the water spray quality sensor 3 and the water spray impact pressure sensor 4 It is connected to the input terminal of computer 12 . The test points can be four, six, etc., as long as it is ensured that the four or six test points are all on a straight line, and the moving route of the nozzle 2 is parallel to or centered on the straight line; A water spray quality sensor 3 or a water spray impact pressure sensor 4 is set on the test point.

The nozzle 2 is movable, which is driven by a power device, and moves in a chain or screw drive mode, and moves under the set parameters including speed, water pressure, air pressure, etc. The best way to move is to move at a constant speed . The nozzle 2 is connected with the water spray pipeline, and the water source used is provided to the nozzle 2 by the water spray pipe; the nozzle 2 is set on the upper part of the test points A and B, facing the connection line between the points A and B, and its moving track is consistent with The line connecting point A and point B is parallel; the distance between the lower plane of the nozzle 2 and the upper plane of the pressure sensor is the installation height. During actual production and use, the installation height of the nozzle 2 can be adjusted by using handles or knobs. The power unit that drives the nozzle 2 to move can be devices such as stepping motors in the prior art.

Water spray quality sensor 3 of the present invention, except that sensor in the prior art can be utilized, also can adopt the water spray quality sensor 3 that is made up of sump 5, holding tank 6 and electronic balance 8 as shown in the figure, sump 5 is on the top, below is the water tank 6, the water tank 6 is arranged on the pallet of the electronic balance 8, and the outlet pipe 7 of the water tank 5 is positioned at the top of the water tank 6; the water tank 5 is a circular or square container. The water sprayed by the nozzle 2 is received within the scope of the caliber, and then flows into the water tank 6, and the quality of the water is weighed by the electronic balance 8, and the water spray volume and its increment per unit time period are calculated.

Water spray impact pressure sensor 4 of the present invention, except that can utilize the sensor in the prior art, can also adopt the sensor that is made up of pressure transmission bar 9 as shown in the figure, water barrier 10 and electronic balance 11, water barrier 11 is set on the upper end of the pressure transmission rod 9, and the lower end of the pressure transmission rod 9 is in contact with the tray of the electronic balance 11; , the electronic balance 11 calculates the impact pressure of the water spray per unit time period. Both the electronic balance 8 and the electronic balance 11 can adopt products in the prior art, which can calculate the increment of water spray volume and the impact pressure of water spray.

Computer 12 of the present invention, adopts the product in the prior art, has basic configuration and data processing capacity, as CPU, printer, plotter, test software etc., can collect, process the data that electronic balance 8 and electronic balance 11 input , calculation, etc. As a prior art, it will not be described in detail here.

The water or gas of the present invention is provided by the water spray pipeline and the gas pipeline, and its water pressure and air pressure are adjustable, and can be adjusted to the test parameter range required by the present invention. As a prior art, it will not be described in detail here.

As shown in Figures 2 and 3, it is a flowchart of the LZPZ Software V1.5 testing software used by the present invention. In the present invention, the flow process of the test software is divided into two types: the upper computer program flow and the lower computer program flow. The lower computer can send the data such as the relevant nozzle position collected to the upper computer for processing; the upper computer sends the data sent by the lower computer, related The data of the moving direction of the nozzle and the data of the balance are collected and processed, and finally the distribution diagram of the water flow density distribution and the impact pressure is drawn. Those skilled in the art can compile test software according to the flow chart and the technical content disclosed in the present invention, and the test software and its flow chart are not regarded as the protection points of the present invention, and will not be described in detail here.

As shown in FIG. 4 , it is a distribution diagram of water flow density distribution and impact pressure obtained in the test of the present invention.

Embodiment one: below with concrete instrument, test method etc. describe in detail (referring to Fig. 1)

The basic configuration of the present invention is selected as follows:

1 tester platform; 2 precision electronic balances

1 pressure transmission rod; 1 computer

1 printer; LZPZ Software V1.5

Main technical index of the present invention:

Test object: continuous casting secondary cooling water nozzle and air-water nozzle

Data collection interval time: 0.5-5s; Nozzle moving speed: 1-10mm/s

Maximum water flow density: 1100ml; Impact pressure range: 0-10Ma

Movement mode: driven by stepper motor, controlled by computer or instrument control panel

Test error: ±3%

The hardware part of the present invention is assembled as follows:

1. Install the pressure transmission rod at the A hole of the test box, and install the water collection tank at the B hole.

2. Install the electronic balance with a measuring range of 1.0Kg at hole A, so that the lower disk of the pressure transmission rod is in contact with the balance tray.

3. Adjust the position of the pressure transmission rod so that it is at the center of hole A, and then put the water barrier on the outside of the pressure transmission rod.

4. Install the electronic balance with a measuring range of 1.5Kg at hole B, place the water tank on the balance tray, and make the outlet pipe of the water collection tank above the water tank.

5. Connect the data cable and power cable of the electronic balance.

6. Connect the output data line of the instrument to the computer.

The software part of the present invention: the software LZPZ Software V1.5 of test instrument can run under win98/win2000/winXP, it is suggested to use winXP system. During installation, execute the Setup.exe application program in the installation CD, use the default prompts, and follow the steps to install.

After starting the LZPZ test program, the main interface is divided into menu bar, tool button bar, nozzle movement monitoring area, data display bar, communication status indicator bar and status bar. In the data display column, the impact pressure value is displayed on the left, and the water flow density value is displayed on the right. The communication status indicator bar is the oval figure in the lower part of the interface, which shows the working status of the sensor data acquisition communication terminal. When it is displayed in red, it means that the communication is interrupted and cannot work normally; when it is displayed in light green, it means that it is working normally. The status bar at the bottom contains the test data save file name, test status and test time and other information.

Experimental parameter settings

Click the "Parameter Settings" button in the tool menu bar to set parameters.

The parameters to be set include: the model of the nozzle to be tested, the source, the test condition, the test parameters and the file name for saving the test results. The file name can only be named with numbers, letters and horizontal lines. After the input is complete, click the OK button to save all parameters to the database; if you give up this parameter setting, click the Cancel button to return to the main interface.

The input contents in the test conditions include the installation height of the nozzle, and the water pressure, air pressure, water flow and air flow under the working state.

In the test parameters, the collection diameter is the length of the water collection tank along the spraying direction; the spraying width is the width of the water belt sprayed out by the nozzle; the collection time is the time step for collecting test data, which can be set within the range of 0.5-5s; the moving speed is the nozzle The speed of the moving mechanism can be set within the range of 5-10mm/s.

Start and stop of the test

After the parameter setting is completed, the test can be started. After starting, if the nozzle is not at the initial position of the test, the power moving mechanism will automatically drive the nozzle back to the initial position, and then start the test; the nozzle moves from the starting position of the test to the end position, and the computer collects the impact pressure and water flow density during the moving process , and save it with the specified filename. The default path for saving is "program installation path/data".

If the nozzle needs to stop moving during the test, click the stop button, the nozzle will no longer move, and the test process ends.

Live picture and real-time curve

After starting the test, the default display is the main interface of the program. The nozzle movement monitoring area of this interface reflects the actual movement of the nozzle in real time, that is, the scene picture. The whole process of the test can be observed on this interface.

Click the real-time curve button during the test to display the distribution diagram of water flow density and impact pressure in the direction of nozzle movement, and the change values of water flow density and impact pressure can be displayed in real time in the data box at the lower part of the interface.

Click the data management button, the data area displays the parameters of all test experiments in the database. Select an experiment record, the selected record is blue, and then you can perform the following operations on this record.

1. Calculation: Click the calculation button to calculate the spray angle and air-water ratio of the nozzle under the test conditions.

2. Delete data: delete the selected experimental data records.

3. Save data: The content of the note can be modified, and you need to click the save data button to save after modification.

4. View curve: After clicking this button, a historical curve dialog box will pop up, displaying the distribution curve of the selected experimental water flow density and impact pressure, as shown in Figure 7.

5. Report preview and report printing: the water flow density, impact pressure value and distribution curve of the tested nozzles are displayed in the report.

6. Exit: return to the main interface.

The testing method of device of the present invention

(1) Preparatory work

Turn on the main power supply of the instrument, the power supply of the stepper motor and the computer, run the test software, and check the working conditions of the water supply pipeline and the gas supply pipeline.

(2) Test steps

1. Install the nozzle: install the nozzle on the nozzle connecting pipe and fix the connecting pipe.

2. Adjust the installation height: adjust the vertical handle so that the distance between the lower plane of the nozzle and the upper plane of the pressure sensor is equal to the installation height.

3. Turn on the water circuit and air circuit switch, adjust the water pressure, air pressure and its flow rate to the experimental conditions.

4. Nozzle centering: adjust the horizontal handle and the rotation direction of the nozzle so that the spray water falling on the bottom plate of the test box is on the straight line between the two sensors to ensure the centering of the nozzle.

5. Pre-test: In order to eliminate the influence of water wetting and adhesion on the sensor, the initial experiment should make the nozzle run once under the state of spraying water. First click the parameter setting button, the nozzle moving speed is selected as 10mm/s, and other parameters are set arbitrarily, and the name is named Protest. Then click the start button, and after the nozzle reciprocates once and returns to the initial point, click the stop button. Cover the pressure transmission rod with a waterproof cover, and then reset the display value of the pressure sensor to zero. The pre-test is complete.

6. Formal test: Set the test parameters, the recommended collection time is 1s, and the nozzle moving speed is 5mm/s. Click the start button: the nozzle starts to run and collect data from the pressure sensor; when the nozzle moves to the position of the water flow density sensor, the data collection of the water flow density and impact pressure on one side of the nozzle is completed; the nozzle continues to move and returns to the test initial position pressure at the sensor. After the nozzle reaches the position of the water flow density sensor, put the waterproof cover back on the sump, and empty the water in the sump. The nozzle returns to the initial position, and the "Next Experimental Step" dialog box pops up.

7. Rotation direction: turn off the water circuit and air circuit switch, and rotate the nozzle 180 degrees. Repeat steps 3 and 4.

8. Reverse test (nozzle symmetry test): Click the OK button in the dialog box, and remove the waterproof cover while clicking. The nozzle starts to move from the starting position and the computer collects the data. After the nozzle moves to the position of the water flow density sensor, the data collection of the water flow density and impact pressure on the other side of the nozzle is completed. The nozzle continues to move back to the test initial position. So far, a complete test of the distribution of nozzle water flow density and impact pressure has been completed.

(3) Test results

Viewing the test results

The distribution curves and parameters obtained from the nozzle flow density and impact pressure tests can be viewed in the data management interface, and the test results can be printed through reports.

The data values obtained from the water flow density and impact pressure tests are saved in text format in the Data folder of the directory where the software is installed. You can use Notepad to open and view the original saved water flow density and impact pressure test values.

Claims (6)

1, the testing spraying characteristic of secondary cooling nozzle of continuous casting method the steps include:

(1), adopts moving nozzle, water spray mass sensor and water spray surge pressure sensor water spray in moving on the collection point that is arranged on below this nozzle;

(2), water spray mass sensor and water spray surge pressure sensor be injection flow rate and increment and the water spray surge pressure value of per unit time period of collecting, is real-time transmitted to computing machine;

(3), computing machine is according to parameter and the program set, calculates the jet density value and the surge pressure value of collection point, obtain the nozzle jet density and distribute and the surge pressure distribution plan.

2, a kind of device of realizing the described testing spraying characteristic of secondary cooling nozzle of continuous casting method of claim 1 comprises device body (1), is arranged on nozzle (2) on the device body (1), is arranged on water spray mass sensor (3) and water spray surge pressure sensor (4) on the test point, contains computing machine (12) and the water pipe and the gas piping of testing software; It is characterized in that: described nozzle (2) is a packaged type, is driven by propulsion system; Described nozzle (2) is arranged on water spray mass sensor (3), water spray surge pressure sensor (4) top, over against the line of water spray mass sensor (3), water spray surge pressure sensor (4); The DOL Data Output Line of water spray mass sensor (3), water spray surge pressure sensor (4) links to each other with the input end of computing machine (12).

3, device according to claim 2, it is characterized in that: described water spray mass sensor (3) is made up of water leg (5), Storage water tank (6) and electronic balance (8), water leg (5) in the above, be Storage water tank (6) below, Storage water tank (6) is arranged on the pallet of electronic balance (8), and the DOL Data Output Line of electronic balance (8) links to each other with the input end of computing machine (12).

4, according to claim 2 or 3 described devices, it is characterized in that: described water spray surge pressure sensor (4) transmits bar (9) by pressure, dash hurdle (10) and electronic balance (11) are formed, dash hurdle (11) is enclosed within the upper end that pressure transmits bar (9), the lower end that pressure transmits bar (9) contacts with the pallet of electronic balance (11), and the DOL Data Output Line of electronic balance (11) links to each other with the input end of computing machine (12).

5, device according to claim 4 is characterized in that: described propulsion system are stepper motors, drive nozzle (2) in the mode of chain or screw mandrel transmission and move.

6, testing spraying characteristic of secondary cooling nozzle of continuous casting method according to claim 1 is characterized in that: the move mode of described nozzle (2) is at the uniform velocity mobile, and velocity range is 5-10mm/s.

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