阅读说明：本技术 一种提升热轧层流冷却水阀响应速度的测试方法 (Test method for improving response speed of hot-rolled laminar cooling water valve ) 是由 王磊 张鹏鹏 刘婷 付芳欣 赵勇 柳志钢 于 2020-04-07 设计创作，主要内容包括：本发明公开了一种提升热轧层流冷却水阀响应速度的测试方法,采用将测试手柄直接连接到层冷水阀端子箱使层冷水阀模拟实际生产过程中的水阀逐一自动开、关,测试人员按照层冷水刚触到层冷辊道与层冷水完全关闭的时刻分别按下测试手柄,此时计算机会记录下水阀开关间隔时间的日志,测试完成后进行集中统计,计算出响应时间超限的水阀,并投入了水阀打分制度。此方法的投入减少了当前人工用秒表统计水阀时间的误差,提升了统计效率及水阀维护周期,保证了水阀的状态。(The invention discloses a test method for improving response speed of a hot-rolled laminar cooling water valve, which is characterized in that a test handle is directly connected to a laminar cooling water valve terminal box to enable the laminar cooling water valve to simulate the automatic opening and closing of water valves in the actual production process one by one, a tester presses down the test handle respectively according to the moment that laminar cooling water just touches a laminar cooling roller way and the laminar cooling water is completely closed, a computer records a log of the open and close interval time of the water valve at the moment, centralized statistics is carried out after the test is finished, the water valve with response time exceeding the limit is calculated, and a water valve grading system is put into use. The method reduces the error of the time of counting the water valve by using the stopwatch manually at present, improves the counting efficiency and the maintenance period of the water valve, and ensures the state of the water valve.)

1. A test method for improving response speed of a hot-rolled laminar cooling water valve is characterized by comprising the following steps:

s1, laying a circuit, connecting the circuit with a terminal box of the layer cooling roller water valve, and connecting the other end of the circuit to a test handle;

s2, setting a spray mode in a secondary operation picture of the rolling mill to be automatic Auto;

s3, connecting a SPRAY SPRAY server, starting VTEST _ JOB program monitoring, and opening a log recording picture;

s4, after the steps are completed, the test handle is operated on site, and after the test is started, the handle is operated according to the following rules: the water drops drop on the roller way and press once, the last drop of water disappears and presses once, the water valve does not react and press, and simultaneously, the computer picture is operated;

s5, testing the connection state of the water valve at the computer terminal, clicking Open ALL on the computer operation picture, and if the layer cold water valve is completely opened, the connection state is normal;

s6, formally starting the Test, clicking Resp Test on the computer operation picture, and automatically opening and closing the layer cold water valves one by one in sequence; operating the handle according to the operation rule on site, observing whether an automatic recording test log is generated according to the actual water valve switching sequence at the computer terminal, and if so, testing normally; otherwise, operation proceeds to step S5.

Technical Field

The invention relates to a test method for improving response speed of a hot-rolled laminar cooling water valve, which is mainly used for accurately testing response time of the water valve and efficiently optimizing the response time of a production line for controlling the finish rolling temperature of strip steel by using laminar cooling water in various steel mills, thereby improving product quality.

Background

At present, a laminar cooling system is used in hot rolling production lines of domestic and foreign iron and steel enterprises, and the laminar cooling system has the main function of rapidly cooling a finish rolling outlet according to a set target temperature for coiling so as to reach a target set value to ensure the product performance of strip steel.

With the improvement of the yield of 2250mm hot rolling in a rare earth steel plate factory, the quality of a hot rolled product has higher requirements, the requirements on production are higher and higher, the steel type and the specification are more and more complicated, the difficulty of the process is greatly increased, and the process requirement is generated based on market situation. Therefore, according to the current market situation, the production of hot rolling enterprises tends to be more complex and the difficulty is increased. Particularly, since the production of pipeline steel and other special steel grades, the low-temperature control of the curling temperature has higher and more accurate requirements on the response speed of a water valve of laminar cooling water, the water flow distribution, the water pressure and the like. The realization mode of the CTC control model used by the current hot-rolled laminar cooling system is as follows: the system presets and calculates the water quantity required for reaching the target coiling temperature according to the outlet temperature of the finish rolling and the set rolling speed, then calculates and determines how many water valves are opened according to the water quantity, and can timely adjust the switch of the laminar cold water valve according to the actual temperature measured by a laminar cold intermediate temperature measuring point (MT) and a coiling temperature measuring point (CT) in the rolling process, thereby ensuring the integral uniformity of the temperature in the length direction of the rolled strip steel. Therefore, the response speed of the laminar cold water valve is particularly important. In the hot rolling production process, the finish rolling speed is generally between 2m/s and 2.7m/s, if the opening or closing response of a laminar cooling water valve is slow for 1 second, 2m to 2.7m strip steel is cooled or severely cooled, so that the problems of uneven integral cooling, improper partial performance and the like of the strip steel can be caused, the self-learning control of a CTC model can be influenced, and the laminar cooling temperature of the strip steel rolled subsequently is controlled inaccurately. At present, the existing layer cooling system in our factory has the problems of slow response of opening and closing a layer cooling water valve, no response and the like, and the problems of untimely cooling, uneven cooling and the like of strip steel caused by different degrees, so that a series of quality problems of strip steel, improper product performance and the like are caused. The problems of unqualified coiling temperature, warped strip steel, poor plate shape caused by nonuniform cooling in the width direction and the like caused by nonuniform cooling of the strip steel occur for many times in the production process of a rolling line, and especially the unqualified coiling temperature can seriously cause unqualified product steel structure performance and influence on customer use, thereby generating quality objection and damaging the brand reputation of our factory. Therefore, ensuring product quality becomes an important part in production.

Disclosure of Invention

The invention provides a test method for improving response speed of a hot-rolled laminar cooling water valve, solves the technical problems of production difficulty of manually counting response time of a laminar cooling water valve only by a stopwatch, low standard reaching rate of strip steel coiling temperature and wave shape generated by uneven strip steel cooling and the like caused by uneven response time and even no response of the laminar cooling water valve, and achieves the technical effects of improving coiling temperature hit rate, improving product quality and reducing accident rate.

In order to solve the technical problems, the invention adopts the following technical scheme:

a test method for improving response speed of a hot-rolled laminar cooling water valve comprises the following steps:

s1, laying a circuit, connecting the circuit with a terminal box of the layer cooling roller water valve, and connecting the other end of the circuit to a test handle;

s2, setting a spray mode in a secondary operation picture of the rolling mill to be automatic Auto;

s3, connecting a SPRAY SPRAY server, starting VTEST _ JOB program monitoring, and opening a log recording picture;

and S4, after the steps are completed, two testers are in place, wherein one tester operates the test handle on site, and operates the test handle according to the following rule after the test is started, namely, water drops are dropped onto the roller way to press once, the last drop of water disappears to press once, and the water valve does not react and cannot be pressed. The other bit operates the computer picture;

s5, testing the connection state of the water valve at the computer terminal, clicking OpenALL on the computer operation picture, and if the cold water valve of the layer is completely opened, the connection state is normal;

and S6, formally starting the Test, and clicking Resp Test on the computer operation picture to see that the layer cold water valves are automatically turned on and off one by one in sequence. And operating the handle by a field operator according to the operation rule, and observing whether an automatic recording test log is generated according to the actual water valve switching sequence by a secondary operator at the computer terminal. If yes, testing normally; otherwise, operation proceeds to step S5.

Compared with the prior art, the invention has the beneficial technical effects that:

the testing handle is directly connected to the terminal box of the laminar cooling water valve, so that the laminar cooling water valve can be automatically opened and closed one by one in the process of simulating actual production, a tester respectively presses the testing handle according to the moment when laminar cooling water just touches a laminar cooling roller way and the moment when laminar cooling water is completely closed, a computer can record a log of the interval time of opening and closing the laminar cooling water valve at the moment, centralized statistics is carried out after the test is finished, the water valve with response time exceeding the limit is calculated, and a water valve scoring system is put into use. The method reduces the error of the time of counting the water valve by using the stopwatch manually at present, improves the counting efficiency and the maintenance period of the water valve, and ensures the state of the water valve.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

FIG. 1 shows the data arrangement result of the test results

FIG. 2 is a calculation result of response time of opening of a laminar cooling water valve

FIG. 3 is a calculation of response time of a laminar cooling water valve closure

FIG. 4 is a graph comparing the results of recent 5 (lower blow open) tests with model value analysis (a cut-away view)

FIG. 5 is a graph (cut-away) comparing the results of recent 5 (upper jet) tests with model value analysis.

Detailed Description

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

a test method for improving response speed of a hot-rolled laminar cooling water valve mainly comprises the following steps:

a. the method comprises the following steps of line connection, wherein a prepared power line with one end connected to a test handle is connected with a terminal box of a laminar cooling water valve and used for collecting a handle signal into a system;

b. the circuit is fixed, so that the phenomenon that the connection is disconnected due to the fact that the handle is dragged in the retest process is avoided, and the test effect is influenced;

c. and (4) laying a line, laying the line of the connection number to the first group of water valves of the laminar cooling water, and reserving the line with enough length (about 20 meters).

2. The computer operation terminal setting of the invention mainly comprises the following steps:

a. setting a spray mode in a secondary operation picture of the rolling mill as automatic Auto;

b. starting VTEST _ JOB program monitoring, and opening a log recording picture;

c. clicking the picture Open ALL to Open ALL water valves and testing the line connection state;

3. after the test connection state is normal, starting to test one by one:

two testers are in place, wherein one tester operates a test handle on site, presses a key after starting a test, and needs to pay attention to the fact that water drops on a roller way to press once, the last drop of water disappears to press once, and a water valve does not react and cannot be pressed; one bit operates the computer picture, observes the log updating condition and ensures that the line connection state is intact in the test process. If the log is found to stop updating, the test is immediately terminated to search the reason. Fig. 2 shows the response time test operation process of the laminar cooling water valve.

4. And after the test is finished, exporting the data and sorting the data.

After the test is completed, the finished data (as shown in fig. 1) is filled into a pre-designed laminar cooling water valve response time calculation model, so that whether the switch response time of each water valve is within a standard value range can be automatically calculated, and the switch response time is displayed in different colors (as shown in fig. 2 and fig. 3), for example: the background of the unresponsive water valve (response time is 0) table is filled with yellow automatically, red automatically when the response time exceeds 3 seconds, normal and unchanged, and the like. After each test is finished, the test result is compared with the model value in a drawing analysis mode and then compared with the recent test result, so that the change of the state of each valve is counted, and the laminar cooling water valve with large response time fluctuation and poor stability is preferentially processed and replaced (as shown in figures 4 and 5). Thereby ensuring the stability of the laminar cooling water valve. By using the data results as the basis, the electrical and mechanical maintenance personnel can more quickly and accurately judge which water valves need to be maintained immediately and which water valves need to be replaced immediately. The efficiency and the quality are maintained to the cold water valve of improvement. Fig. 3 shows raw data of a test water valve.

In conclusion, the response time of the hot-rolled laminar cooling water is tested by adopting the method, so that the response time of the water valve is accurate to millisecond level, and the on-off of the water valve is controlled more accurately. And each laminar flow water valve is marked according to the test result, and the water valve with low score is checked and maintained in time according to the marking result. The measure thoroughly changes the prior maintenance mode that the water valve does not spray water to maintain and replace the water valve, but cleans the air filter element of the water valve and performs oil treatment on the air filter element of the water valve by using the roller changing time of the water valve with low score, and the replacement work of the water valve is basically not needed at present. Therefore, the maintenance workload is reduced linearly, only 80% of the original. And the detection and maintenance of the water valve state can be finished by utilizing the roller changing time at present, so that the influence on the production operation caused by long-time stop is avoided.

The invention thoroughly solves the problem of difficulty in manually calculating the response time of the water valve by a stopwatch over the years, greatly reduces the daily maintenance workload of the water valve, and reduces the error of manual timing, thereby effectively eliminating the defects of substandard coiling temperature, warped strip steel, poor plate shape caused by uneven cooling in the width direction and the like caused by uneven response time hierarchy of the water valve, improving the product quality, and ensuring high-quality and high-quality production.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.