Valve control method and system for adjusting equivalent section and cooling system

Abstract

The embodiment of the invention provides a valve control method and system for adjusting an equivalent section and a cooling system, and belongs to the field of valve control. The control method comprises the steps that the working state of a flow dividing reversing valve arranged at a main pipeline is detected, when it is detected that the flow dividing reversing valve is switched to a trench pipeline state, a main flow adjusting valve is locked, a back pressure valve is adjusted to the initial opening degree according to the use condition of a nozzle, and the back pressure valve is continuously adjusted according to the flow detection condition of the main pipeline; and when it is detected that the working state changes and / or the flow detection of the main pipeline is kept stable within a certain range, the back pressure valve is locked. The control process is changed in real time according to the working state of the flow dividing reversing valve, and the back pressure valve is continuously adjusted according to the use condition of the nozzle in the next cooling process and the real-time flow detection stability condition of the main pipeline. The equivalent area of the trench side is equal to the equivalent area of the water tank side during next cooling, and therefore it is guaranteed that flow and pressure are kept consistent before and after reversing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve control, in particular to a valve control method for adjusting equivalent cross section, a control system and a cooling system. BACKGROUND

[0002] In a pipeline provided with a shunt reversing valve, the main pipeline can realize switching of the valve export direction through on-off of the internal valve core of the shunt reversing valve, and then quickly communicate with other pipelines. However, when the internal structure or use of other pipelines is different, the equivalent cross sections of the pipelines are likely to be inconsistent.

[0003] The above-mentioned situation is more obvious in a circulating cooling system. The circulating cooling system includes a water circulation system, a main pipeline, a water tank and a pipeline, and a ditch and a pipeline. The water tank side pipeline of the shunt reversing valve sprays high-pressure cold water to the rolled piece through a plurality of nozzles, and the ditch side water of the shunt reversing valve directly flows back to the water circulation system, thereby causing the equivalent cross sections of the water tank side and the ditch side to be inconsistent. When the shunt reversing valve switches the water path, the switching speed is much greater than the adjusting speed of the regulating valve, resulting in a large fluctuation of the pipeline water quantity and pressure, thereby causing the cooling effect of the head of the rolled piece to be very poor, greatly affecting the yield rate, and impacting the pipeline, mainly in the form of pressure oscillation, vibration and potential equipment damage.

[0004] One of the existing methods for solving the above-mentioned problems is to not set a back pressure valve on the ditch side, and when switching to the ditch side, the opening of the inlet flow regulating valve of the main pipeline is locked, and when switching to the water tank side, the regulating is started with a delay. However, the above-mentioned method cannot fundamentally solve the problem of inconsistent equivalent cross sections of the water tank side and the ditch side, and the fluctuation of the flow and pressure in the pipeline still exists, and the time of the delay cannot be accurately determined. Another method is to set a back pressure valve on the ditch side, which is adjusted manually. However, this method cannot achieve real-time and synchronous adjustment, and cannot cover complex working conditions and equipment changes. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a valve control method for adjusting equivalent cross section, a control system and a cooling system. The valve control method for adjusting equivalent cross section automatically adjusts the back pressure valve and the main flow regulating valve according to the use of the actual water tank and nozzles, and through a dynamic and continuous adjustment process, the equivalent cross sections of the water tank side and the ditch side are approximately equal, thereby ensuring that the "non-cooling section" control effect of the head and tail of the rolled piece to be cooled is better.

[0006] In order to achieve the above-mentioned purpose, the valve control method for adjusting equivalent cross section provided by the embodiments of the present application includes the following steps:

[0007] Detecting the working state of the split diverting valve arranged at the main pipeline, the working state including switching state, switching to the trench pipeline state and switching to the water tank pipeline state; wherein, the main pipeline is provided with a main flow regulating valve, the trench pipeline is provided with a back pressure valve, the water tank pipeline is communicated with a water tank, the water tank is provided with a plurality of nozzles aiming at the rolled piece to be cooled; and when switching to the trench pipeline state is detected, the main flow regulating valve is locked, and the back pressure valve is adjusted to an initial opening degree according to the use condition of the nozzles, and then the back pressure valve is continuously adjusted according to the flow detection condition of the main pipeline until the working state changes and / or the flow detection of the main pipeline remains stable within a certain range, the back pressure valve is locked.

[0008] Optionally, in the default state, the split diverting valve is controlled to communicate with the trench pipeline, and the working state is the switching to the trench pipeline state; in response to a cooling instruction, the split diverting valve is controlled to communicate with the water tank pipeline, and the working state changes from the switching to the trench pipeline state to the switching state and then to the switching to the water tank pipeline state.

[0009] Optionally, when the switching state is detected, the opening degree of the main flow regulating valve and / or the back pressure valve is locked.

[0010] Optionally, adjusting the back pressure valve to the initial opening degree according to the use condition of the nozzles includes the following steps: establishing a nozzle-initial opening degree table according to the historical use condition of the nozzles and the historical initial opening degree of the back pressure valve; reading the next cooling instruction, and obtaining the future use condition of the nozzles from the cooling instruction; calling the nozzle-initial opening degree table and finding the initial opening degree corresponding to the future use condition of the nozzles; and adjusting the opening degree of the back pressure valve to the initial opening degree.

[0011] Optionally, the control method further includes the following steps: when the working state changes, updating the nozzle-initial opening degree table with the last locked opening degree of the back pressure valve.

[0012] Optionally, continuously adjusting the back pressure valve according to the flow detection condition of the main pipeline includes the following steps: calculating an average flow value of the main pipeline within a preset pulse time; comparing the current flow value with the average flow value to determine a target opening degree, and adjusting the back pressure valve to the target opening degree; and after a preset interval time, starting the next pulse and repeating the above process.

[0013] Optionally, when the difference between the current flow value and the last average flow value is within a preset range, it is determined that the flow detection of the main pipeline remains stable within a certain range.

[0014] In a second aspect, the valve control system for adjusting the equivalent cross section provided by the embodiments of the present application includes: a memory, the memory storing instructions; and a processor, the processor calling the instructions in the memory to enable the valve control system for adjusting the equivalent cross section to implement the valve control method for adjusting the equivalent cross section.

[0015] In a third aspect, a computer readable storage medium is provided, and the computer readable storage medium stores instructions which, when executed by a processor, implement the valve control method for adjusting equivalent cross section.

[0016] In a third aspect, a cooling system is provided, and the cooling system comprises: a pipeline, including a main pipeline, a trench pipeline and a water tank pipeline; the trench pipeline is provided with a back pressure valve; a main flow regulating valve is arranged at an inlet of the main pipeline, and a flow distribution reversing valve is arranged at an outlet of the main pipeline, and the flow distribution reversing valve is selectively communicated with the trench pipeline and the water tank pipeline; a water supply pump group is communicated with the inlet of the main pipeline, and is used to supply water to the main pipeline; a water tank is communicated with an outlet of the water tank pipeline, and is internally provided with a plurality of nozzles, and is used to align and cool a rolled piece to be cooled; a trench is communicated with an outlet of the trench pipeline and an inlet of the main pipeline; a water cooling control system is capable of issuing a cooling instruction; and the valve control system is provided.

[0017] According to the technical solution, the valve control method for adjusting equivalent cross section comprises the following steps: detecting a working state of the flow distribution reversing valve arranged at the main pipeline; wherein the main pipeline is provided with the main flow regulating valve, the trench pipeline is provided with the back pressure valve, the water tank pipeline is communicated with the water tank, and the water tank is provided with a plurality of nozzles to align the rolled piece to be cooled; and when it is detected that the state is switched to the trench pipeline, the main flow regulating valve is locked, the back pressure valve is adjusted to an initial opening degree according to the use of the nozzles, and then the back pressure valve is continuously adjusted according to the flow detection of the main pipeline until it is detected that the working state changes and / or the flow detection of the main pipeline remains stable within a certain range, and then the back pressure valve is locked. The valve opening degree adjustment process is automated, the control process can be changed in real time according to the working state of the flow distribution reversing valve, the back pressure valve is continuously adjusted according to the use of the nozzles in the next cooling and the real-time flow detection stability of the main pipeline, so that the equivalent area of the trench side is equal to the equivalent area of the water tank side in the next cooling after the flow distribution reversing valve is reversed, the cooling flow and pressure before and after the rapid reversing are kept consistent, the poor cooling effect and equipment damage caused by the cooling water fluctuation are avoided, the cooling control effect is improved, and the consistency of product quality is improved.

[0018] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the embodiments of the application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the embodiments of the application, but do not constitute a limitation on the embodiments of the application. In the drawings:

[0020] Figure 1 Schematic diagram of water tank flow fluctuation when the flow distribution reversing valve is switched;

[0021] Figure 2 The schematic diagram of water tank pressure fluctuation when the shunt reversing valve switches;

[0022] Figure 3 The schematic diagram of cooling system structure capable of applying the method of the present application;

[0023] Figure 4 The schematic diagram of main flow of the valve control method for adjusting equivalent section;

[0024] Figure 5 The schematic diagram of the valve control method in the switching process of the reversing valve;

[0025] Figure 6 The specific embodiment of the valve control method proposed by the present application;

[0026] Figure 7 The specific embodiment of the back pressure valve adjusting method proposed by the present application.

[0027] Explanation of reference signs

[0028] 1 is a main flow valve, 2 is a back pressure valve, 3 is a shunt reversing valve, 4 is a pressure detector, 5 is a flow meter, 6 is a nozzle, and 7 is a water tank. DETAILED DESCRIPTION

[0029] The specific embodiments of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the embodiments of the present application, and are not intended to limit the embodiments of the present application.

[0030] It should be noted that the acquisition, transmission, storage, use, processing, etc. of data in the technical solutions of the present application comply with the relevant provisions of laws and regulations. In the embodiments of the present application, some industry existing solutions, components, models, etc. may be mentioned, which should be considered as exemplary, and the purpose is only to illustrate the feasibility of the implementation of the technical solutions of the present application, but it does not mean that the applicant has or will necessarily use the solutions.

[0031] When the shunt reversing valve 3 switches, the switching action is completed instantaneously, and the time for the water flow and water pressure to change and recover to a stable state after switching is relatively long. Taking the example that the shunt reversing valve 3 in the cooling system can switch to the water tank side and the ditch side, as shown in Figure 1 The schematic diagram of water tank 7 flow fluctuation when the shunt reversing valve 3 switches, Figure 2 The schematic diagram of water tank 7 pressure fluctuation when the shunt reversing valve 3 switches, wherein at 500 ms, the shunt reversing valve 3 switches from the water tank 7 direction to the ditch direction, and at 2000 ms, the shunt reversing valve 3 switches from the ditch direction to the water tank 7 direction. It can be seen that there is an unstable fluctuation of flow and pressure in the switching process. Please refer to Figure 3As a schematic diagram of the basic structure of the cooling system, the cooling system at least includes a pressure detection table 4, a flow meter 5, a main flow valve 1 and a split reversing valve 3 arranged at the inlet and outlet of the main pipeline, and the split reversing valve 3 can flow to the ditch or the water tank 7. The water tank 7 is provided with a plurality of nozzles 6 for cooling the rolled piece to be cooled. When the cooling system components are hypothetically divided into the water tank side and the ditch side to show and determine the respective internal stresses, the unstable fluctuation of the flow and the pressure will cause the equivalent cross sections of the water tank side and the ditch side to be different after the split reversing valve 3 switches the direction, thereby causing the cooling effect of the head of the rolled piece to be cooled to be poor, greatly affecting the yield, and at the same time, impacting the pipeline, mainly in the form of pressure oscillation, vibration and potential equipment damage.

[0032] The above situation is more obvious in the field of high-speed water cooling. The water tank 7 is mainly used for rapidly cooling the rolled piece after high-temperature rolling. Through the strong jet of high-pressure water flow, the temperature of the rolled piece is rapidly reduced, the cooling process can refine the grain, improve the strength and toughness, improve the mechanical properties and organizational structure, and at the same time, reduce the generation of oxide skin and improve the surface quality. In addition, water cooling can also control the phase change process of the steel, ensure the stability of the product performance, and meet the needs of different specifications and purposes, which is an indispensable key link in high-speed production. However, high-strength cooling will have two adverse effects on rolling. First, together with the extrusion effect of the rolling mill, it will cause uneven cooling of the head of the rolled piece, resulting in black head, bent head, and head cracking of some specifications. At the same time, due to the windward effect of the head, the head temperature is too low and hard, and these two factors will cause the downstream rack to fail to smoothly bite into the rolled piece, resulting in a steel stacking accident. Second, the high-pressure water flow will have a strong impact on the rolled piece running at high speed (the maximum speed can reach 110 m / s), especially for small-sized rolled pieces, which will cause the rolled piece to shake violently and easily induce a steel stacking accident. Therefore, during strong water cooling, it is necessary to ensure that the water can be opened after the head passes, that is, it is necessary to ensure that there is a long enough head non-cooling section to ensure that the head of the rolled piece reliably passes through the water tank 7 and enters the downstream rack at an appropriate temperature. If the tail non-cooling section is too long, the tail of the rolled piece is high in temperature and easy to appear tail throwing, resulting in production accidents; if the tail non-cooling section is too short, the tail of the rolled piece is easy to appear small circle and difficult to collect and process subsequently, so it is necessary to ensure that the length of the tail non-cooling section is controllable, thereby having a high requirement for control accuracy.

[0033] Please refer to Figure 4 to Figure 5 In order to deal with the above situation, the valve control method for adjusting the equivalent cross section provided by the present application includes the following steps S10-S50.

[0034] Step S10: detecting the working state of the split diverting valve 3 arranged at the main pipe, the split diverting valve 3 can be selectively switched to the trench pipe or the water tank pipe, thereby making the main pipe communicate with the trench pipe or the water tank pipe. Therefore, the working state includes the switching state, the switching to the trench pipe state and the switching to the water tank pipe state. The switching state is the process that the split diverting valve 3 is switched from the trench side to the water tank side or from the water tank side to the trench side; the switching to the trench pipe state is that the split diverting valve 3 has been switched to the trench side, at this time, the main pipe communicates with the trench pipe; the switching to the water tank pipe state is that the split diverting valve 3 has been switched to the water tank side, at this time, the main pipe communicates with the water tank pipe.

[0035] For the above structure, the main flow valve 1 is arranged at the main pipe, and the back pressure valve 2 is arranged at the trench pipe. The opening degree of the main flow valve 1 and the back pressure valve 2 can be dynamically adjusted, for example, when the opening degree is 0%, the pipe is completely closed; when the opening degree is 100%, the pipe is completely opened. The trench pipe communicates with the trench, which can recycle water and flow back to the main pipe. The water tank pipe communicates with the water tank 7, and the water tank 7 is provided with a plurality of nozzles 6 aiming at the rolled piece to be cooled. Therefore, adjusting the main flow valve 1 can provide the required amount of water for cooling, and adjusting the back pressure valve 2 can change the amount of backflow. In this embodiment, when there is no other pipeline, the diverting valve is switched, only the trench or the water tank 7 is conducted, at this time, the split diverting valve 3 can adopt a fast switching three-way valve.

[0036] In the default state, that is, when there is no cooling demand, the split diverting valve 3 is controlled to communicate with the trench pipe, and the working state always remains in the switching to the trench pipe state. When there is a cooling demand, in response to the cooling instruction, the split diverting valve 3 is controlled to communicate with the water tank pipe, and the working state changes from the switching to the trench pipe state to the switching state and the switching to the water tank pipe state in turn. When the working state is switched to the water tank pipe state, the cooling instruction is started to be executed, and the cooling instruction is different in the number and position of the used cooling water nozzles 6 according to different cooling demands. In this embodiment, before the split diverting valve 3 is controlled to communicate with the water tank pipe, the number and position of the nozzles 6 can be set according to the cooling instruction. The cooling instruction comes from the "water cooling control system" of the upper cooling system, which first determines the specification of the next rolled product to be cooled according to the production plan, and automatically or manually selects the number and position of the used cooling water nozzles to generate the cooling instruction, at this time, the cooling instruction is not sent out, but only can be read. The trigger of the cooling instruction is triggered by the signal of the detection element arranged in front of the water tank 7, and the adjustment of the nozzles 6 is completed before the rolled piece to be cooled advances to the water tank 7. Because the distance from the detection element to the water tank 7 is very long, it can ensure that the cooling nozzles 6 have enough time to complete the adjustment.

[0037] Step S30: When detecting switching to the trench pipe state, lock the main flow valve 1, and adjust the back pressure valve 2 to the initial opening degree according to the use of the nozzle 6, then continuously adjust the back pressure valve 2 according to the flow detection of the main pipe, and lock the back pressure valve 2 when detecting that the working state changes and / or the flow detection of the main pipe remains stable within a certain range. The above control process is a dynamic process, which is further divided into steps S31-S33.

[0038] Step S31: According to the working state of the shunt reversing valve 3 detected in step S10, determine whether the main pipe is in communication with the trench pipe. When detecting switching to the trench pipe state, the main pipe is in full communication with the trench pipe. At this time, the water tank pipe is not in communication with the main pipe, and there is no cooling demand, so the main flow valve 1 can be locked at this time. When the opening degree of the main flow valve 1 is locked, only the opening degree of the back pressure valve 2 needs to be adjusted, which greatly reduces the complexity of adjustment without affecting the cold water circulation.

[0039] Step S32: Adjust the back pressure valve 2 to the initial opening degree according to the use of the nozzle 6. This step begins the first adjustment of the back pressure valve 2, so that the initial opening degree is approximately close to the equivalent opening degree, and then the equivalent cross section of the trench pipe is approximately close to the equivalent cross section of the water tank side. Specifically, the back pressure valve 2 is adjusted to the initial opening degree according to the use of the nozzle 6, including the following steps 1) to 3):

[0040] 1) Establish a nozzle 6-initial opening degree table according to the historical use of the nozzle 6 and the historical initial opening degree of the back pressure valve 2. After the cooling system is manufactured, the mechanical part has been formed, and during the system debugging stage, the control method proposed in the present application is used to test and record the nozzle 6-initial opening degree table through different use combinations of each cooling nozzle 6 and the corresponding equivalent opening degree of the back pressure valve 2, as shown in Table 1. In addition, with the wear and tear of the equipment, nozzle 6 blockage, etc., the table 1 will also change in theory, and this part of the change is updated gradually through the control system by recording the adjustment results of the back pressure valve 2, and the data is processed by filtering, etc. In this embodiment, when detecting that the working state changes, the nozzle-initial opening degree table is updated with the last locked opening degree of the back pressure valve 2, so that the initial opening degree is as close as possible to the actual equivalent opening degree, reducing the adjustment times of step S33, and quickly making the equivalent cross section consistent.

[0041] 2) read the next cooling instruction and get the future nozzle usage from the cooling instruction. Since there is no cooling demand when the last cooling instruction is finished, return to the default state, control the diverter valve 3 to switch from the water tank side to the trench side. According to the foregoing, since the production line is long enough, the quality of the workpiece to be cooled is judged, and the interval between the cooling signals is long enough. Therefore, when the next cooling instruction is generated, it will not be issued, and at this time, reading the next cooling instruction can correspondingly get the number and position of the nozzles 6 that need to be used next time (that is, which nozzles 6 to select).

[0042] 3) call the nozzle-initial opening table and find the initial opening corresponding to the future nozzle usage. Adjust the opening of the back pressure valve 2 to the initial opening.

[0043] Table 1 nozzle-initial opening table (part)

[0044] CW6 CW5 CW4 CW3 CW2 CW1 Back pressure valve equivalent opening % 0 0 0 0 0 0 0 0 0 0 0 0 1 23.5 0 0 0 0 1 0 23.8 0 0 0 0 1 1 34.7 0 0 0 1 0 0 23.8 0 0 0 1 0 1 34.8 0 0 0 1 1 0 34.8 0 0 0 1 1 1 43.4 0 0 1 0 0 0 23.9 0 0 1 0 0 1 35 0 0 1 0 1 0 35 0 0 1 0 1 1 43.4 … … … … … … …

[0045] Step S33, continuously adjust the back pressure valve 2 according to the flow detection of the main pipeline. By adjusting the opening of the back pressure valve 2, the flow is indirectly adjusted. Since the response time of the back pressure valve 2 is fast, and the process of obtaining and processing and displaying the flow detection result is long, there is a delay. In this embodiment, the flow detection of the main pipeline is obtained by the flow meter 5. In this case, the response time of the back pressure valve 2 is about 0.4-0.6s, and the time constant of the flow meter 5 is about 0.2s. The conventional PI regulation characteristic is slow and has the risk of oscillation in complex waterway conditions, and cannot achieve the purpose of rapid adjustment. Therefore, in order to more accurately and quickly pursue the equivalent cross section, it is necessary to continuously adjust the back pressure valve 2 according to the flow detection. Specifically, first, calculate the average flow value at the main pipeline within the preset pulse time, which is calculated from the display value of the flow meter 5. Secondly, compare the current flow value with the average flow value to determine the target opening, and adjust the opening of the back pressure valve 2 to the target opening. Then, after a preset interval, the next pulse is started, and the above process is repeated for the next adjustment, until the working state changes and / or the flow detection of the main pipeline remains stable within a certain range, and the back pressure valve 2 is locked.

[0046] In this embodiment, when the difference between the current flow value and the last average flow value is within the preset range, it is determined that the flow detection of the main pipeline remains stable within a certain range. The change of the working state can be determined according to the foregoing. In addition, in order to give priority to meeting the cooling demand, the priority of judging the change of the working state can be higher than that of the flow detection of the main pipeline remaining stable within a certain range, to determine whether to stop adjusting the back pressure valve 2.

[0047] Step S50: When detecting that the switching state is being switched, the opening of the main flow valve 1 and / or the back pressure valve 2 is locked. Considering that the switching time of the switching valve 3 is short and the valve cannot make real-time adjustment, the opening of the main flow valve 1 and / or the back pressure valve 2 is kept locked. Specifically, when switching from the water tank side to the ditch side, the opening of the main flow valve 1 and the back pressure valve 2 is kept locked. When switching from the ditch side to the water tank side, the back pressure valve 2 is no longer adjusted, and the opening of the main flow valve 1 is locked.

[0048] Taking a typical high-speed wire production line as an example, the cooling of one rolling piece is usually completed every 50 seconds, and the cooling of the next rolling piece is started every 3-6 seconds. Since the rolling speed of the high-speed wire is as high as 110 m / s, the switching action time of the switching valve is generally within 200 ms (fluctuation is not more than 10%), that is, the time from the "switching" command of the control system to the completion of the switching action is about 200 ms, and then the turbid circulating water will fill the empty pipe and form a water channel. At this time, the water channel system is in a very complex state and the duration is short, and the valve cannot make real-time adjustment. At this time, the main flow valve 1 and the back pressure valve 2 are kept in the locked mode, that is, the valve position is unchanged and no adjustment is made.

[0049] In this embodiment, please refer to Figure 6 For the specific embodiment of the valve control method flowchart proposed by the present application, Figure 7 For the specific embodiment of the back pressure valve 2 adjustment proposed by the present application. It can be known that, in the process of normal rolling and cooling, the switching valve 3 directs the cooling water to the water tank pipeline; in response to the "ditch direction" switching command, the value of the flow meter 5 is recorded in real time, and the switching valve 3 starts switching, at which time the opening of the main flow valve 1 and the back pressure valve 2 is locked; after the switching valve 3 switches to the ditch direction, the main flow valve 1 continues to keep the locked state, and the opening of the back pressure valve 2 is adjusted. First, the back pressure valve 2 is adjusted to the initial opening, and then the back pressure valve 2 takes the reading of the flow meter 5 as the feedback, still records the value of the flow meter 5 in real time, and calculates the average flow value in the pulse time, compares the real-time flow meter 5 value with the average flow value, sets the target opening value for opening adjustment, adjusts the back pressure valve according to the target opening value, adjusts the current flow value to the average flow value. If the target opening value is negative, it means that the opening of the back pressure valve is reduced by the absolute value of the target opening value. If the target opening value is positive, it means that the opening of the back pressure valve is increased by the target opening value. When the error between the current reading of the flow meter 5 and the average flow value is less than the set threshold value, or the switching valve 3 switches to the water tank side again, the adjustment of the back pressure valve 2 is stopped and the opening is kept unchanged, the cooling is started, and the value of the flow meter 5 is recorded in real time until the cooling command is completed, and the working state of the switching valve 3 switches to the ditch pipeline state again, the above adjustment process is repeated.

[0050] In the adjustment of the back pressure valve 2, the application adopts the method of table lookup + pulse pure proportional adjustment, and is assisted by the method of locking the opening degree. That is, the initial opening degree value of the back pressure valve 2 is preliminarily determined according to the use of the cooling nozzle through table lookup, and the opening degree adjustment value is calculated according to the comparison result of the current indication and the average indication of the flowmeter 5 (such as the target opening degree can be determined by the difference between the current indication and the average indication multiplied by the proportional coefficient), and the cumulative value of the two, that is, the sum of the initial opening degree value and the target opening degree value, is used as the total opening degree setting value of the back pressure valve 2. During the switching process of the split diverting valve 3, the opening degrees of the main flow valve 1 and the back pressure valve 2 are locked. Due to the feedback time of the detection result of the flowmeter 5, and the fluctuation of the flow and pressure in the main pipeline, the real-time flow detection result cannot be fed back to the detection value of the flowmeter 5 in time, and then the phenomenon of delayed feedback occurs. The application makes use of this feature to set the target opening degree value multiple times according to the delayed detection result of the flowmeter 5, and adjusts the opening degree of the back pressure valve 2 multiple times on the basis of the initial opening degree which has been adjusted, so that the opening degree of the back pressure valve 2 gradually approaches the real equivalent opening degree. The adjustment is intermittent opening degree control with pulse time interval as the period, in the mode of “adjustment-delayed feedback of adjustment effect-adjustment again”. By automatically calculating and adjusting the opening degree of the back pressure valve 2, the intervention of the operator is not needed, the equivalent cross section on the ditch side after the back pressure valve 2 is consistent with the equivalent cross section on the water tank side, so that the cooling flow and pressure before and after the opening and closing of the split diverting valve 3 are kept consistent, the cooling effect difference and equipment damage caused by the fluctuation of the cooling water volume are avoided, the cooling control effect of the water tank 7 is improved, and the consistency of the product quality is ensured.

[0051] The cooling system provided by the application comprises pipelines, a water supply pump group, a water tank 7, a ditch, a water cooling control system and the valve control system provided by the application. The pipelines comprise a main pipeline, a ditch pipeline and a water tank pipeline; the back pressure valve 2 is arranged in the ditch pipeline; the main flow valve 1 is arranged at the inlet of the main pipeline, and the split diverting valve 3 is arranged at the outlet of the main pipeline and can be in communication with the ditch pipeline and the water tank pipeline; the water supply pump group is in communication with the inlet of the main pipeline and is used to supply water to the main pipeline; the water tank 7 is in communication with the outlet of the water tank pipeline and is internally provided with a plurality of nozzles 6, in order to improve the jet speed and pressure of the cooling water and thus enhance the cooling effect, the nozzles 6 often improve the jet pressure by reducing the diameter of the nozzle outlet, and are used to align and cool the rolled piece to be cooled; the ditch is in communication with the outlet of the ditch pipeline and the inlet of the main pipeline; the water cooling control system can generate a cooling instruction according to the detection of the rolled piece to be cooled, determine the use of the required nozzles 6, and issue the cooling instruction in response to a trigger condition.

[0052] The water supply pump group is a continuous water supply system, which generally adopts a split flow type quick switching three-way valve to realize water path switching function. That is, the cooling water of the water tank 7 enters the valve from the inlet, and the switching of the valve outlet direction is realized by "connection" and "disconnection" of the valve core inside the valve. When the wire needs to be cooled, the three-way valve is switched to the water tank side, and the water flow is sprayed from the water tank pipeline. When cooling is not needed, that is, within the cooling interval of the two adjacent wires on the production line, the three-way valve is switched to the ditch side, and the water flow is directly discharged into the ditch. The water sprayed into the ditch directly returns to the main pipeline provided by the water supply pump group, and the rolling piece is not cooled. The water cooling control system switches the direction of the valve according to the control command, thereby realizing the "non-cooling section" control of the head and tail. Taking a typical high-speed wire production line as an example, the cooling of one rolling piece is generally completed every 50 seconds, and the cooling of the next rolling piece starts every 3-6 seconds. Since the rolling speed of the high-speed wire is as high as 110 m / s, the switching action time of the three-way valve is generally within 200 ms (fluctuation not more than 10%).

[0053] The adjusting equivalent cross-section valve control system provided in the present application comprises a memory in which instructions are stored, and a processor which calls the instructions in the memory to enable the adjusting equivalent cross-section valve control system to implement the adjusting equivalent cross-section valve control method described above. The memory can include non-permanent memory in a computer readable medium, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

[0054] The computer readable storage medium provided in the present application has instructions stored thereon, which, when executed by a processor, implement the adjusting equivalent cross-section valve control method described above. The computer readable medium includes permanent and non-permanent, removable and non-removable media, which can be implemented by any method or technology to store information. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. According to the definition herein, computer readable medium does not include transitory computer readable medium such as modulated data signals and carriers.

[0055] The application fundamentally solves the problem of inconsistent equivalent cross sections of the water tank side and the trench side by taking the opening degree of the back pressure valve 2 close to the equivalent opening degree (the opening degree of the back pressure valve 2 when the equivalent cross sections of the water tank side and the trench side are equal) as the target in the process of adjusting and controlling the valve. The application considers the following situations: the fluctuations of flow and pressure in the pipeline still exist when the opening degree of the main flow valve 1 is not adjusted; and the time delay of flow detection is in the variation and cannot be accurately determined to adjust due to the different number and position of the nozzles 6 and the different production processes. If the determined time delay is too short after switching to the water tank side, the equivalent cross sections are inconsistent when the main flow valve 1 is adjusted, and the flow and pressure are unstable; if the determined time delay is too long, the effective adjustment time is delayed, the cooling water amount of the rolled piece cannot be adjusted in real time, and the cooling effect is poor. At the same time, the application controls the valve through the full automatic process, well adapts to the complexity of the process production, discontinuously controls the opening degree in the mode of “adjusting-time delay feedback adjusting effect-adjusting again”, changes the equivalent cross section of the water tank side according to the change of the actual production situation, can realize real-time synchronous adjustment, and can update the nozzle-initial opening degree table when the working condition and the equipment change, so as to ensure the stability of the adjustment and control.

[0056] Those skilled in the art will appreciate that embodiments of the application can be supplied as a method, a system, or a computer program product. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be embodied in the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROM, optical memory, etc.) having computer usable program code embodied therein.

[0057] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0058] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0059] The above merely provides an example of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall into the scope of claims of the present application.

Claims

1. A valve control method for adjusting equivalent cross-section, characterized in that: The steps include: Detecting the working state of the diverter valve provided at the main pipeline, the working state including the switching state, the state of switching to the trench pipeline, and the state of switching to the water tank pipeline; wherein the main pipeline is provided with a main flow regulating valve, the trench pipeline is provided with a back pressure valve, the water tank pipeline is connected to a water tank, and the water tank is provided with a plurality of nozzles aimed at the rolled piece to be cooled; and When it is detected that the switch to the trench pipeline state is made, the main flow regulating valve is locked, and the back pressure valve is adjusted to the initial opening according to the usage of the nozzle. Thereafter, the back pressure valve is continuously adjusted according to the flow detection of the main pipeline until it is detected that the working state has changed and / or the flow detection of the main pipeline remains stable within a certain range, and then the back pressure valve is locked.

2. The valve control method for adjusting the equivalent cross section according to claim 1, characterized in that: In the default state, the diversion reversing valve is controlled to be connected to the trench pipeline, and the working state is the state of switching to the trench pipeline; In response to the cooling instruction, the diversion reversing valve is controlled to be connected to the water tank pipeline, and the working state changes from the switching to the trench pipeline state to the switching state and the switching to the water tank pipeline state in sequence.

3. The valve control method for adjusting the equivalent cross section according to claim 1, characterized in that: When the switching state is detected, the opening of the main flow regulating valve and / or the back pressure valve is locked.

4. The valve control method for adjusting the equivalent cross section according to claim 2, characterized in that: The step of adjusting the back pressure valve to an initial opening according to the usage of the nozzle comprises the following steps: Establishing a nozzle-initial opening table according to the historical usage of the nozzle and the historical initial opening of the back pressure valve; Reading the next cooling instruction and obtaining the future use of the nozzle from the cooling instruction; calling the nozzle-initial opening table and searching for the initial opening corresponding to the future use of the nozzle; as well as The back pressure valve opening is adjusted to the initial opening.

5. The valve control method for adjusting the equivalent cross section according to claim 4, characterized in that: The control method further comprises the following steps: When a change in the working state is detected, the nozzle-initial opening table is updated with the opening of the back pressure valve when it was last locked.

6. The valve control method for adjusting the equivalent cross section according to claim 1, characterized in that: The method of continuously adjusting the back pressure valve according to the flow detection condition of the main line comprises the following steps: Calculating the average flow value at the main line within a preset pulse time; comparing a current flow value with the average flow value to determine a target opening, and adjusting the back pressure valve at the target opening; as well as After the preset interval, the next pulse begins and the above process repeats.

7. The valve control method for adjusting the equivalent cross section according to claim 6, characterized in that: When the following conditions are met, it is determined that the flow detection of the main line remains stable within a certain range: The difference between the current flow rate value and the last average flow rate value is within a preset range.

8. A valve control system for adjusting equivalent cross-section, characterized in that: The valve control system for adjusting the equivalent cross-section includes: a memory having instructions stored therein; and A processor is provided, wherein the processor calls the instruction in the memory so that the valve control system for adjusting the equivalent cross-section implements the valve control method for adjusting the equivalent cross-section as claimed in any one of claims 1 to 7.

9. A computer-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed by a processor, the valve control method for adjusting the equivalent cross-section as described in any one of claims 1 to 7 is implemented.

10. A cooling system, characterized in that: include: The pipeline includes a main pipeline, a trench pipeline and a water tank pipeline; a back pressure valve is provided in the trench pipeline; a main flow regulating valve is provided at the inlet of the main pipeline, and a diverter valve is provided at the outlet of the main pipeline, which can selectively communicate with the trench pipeline and the water tank pipeline; a water supply pump group, connected to the inlet of the main pipeline, for supplying water to the main pipeline; a water tank, connected to the water tank pipeline outlet and provided with a plurality of nozzles inside for aiming at and cooling the workpiece to be cooled; A trench, connected to the trench pipeline outlet and the main pipeline inlet; A water cooling control system capable of issuing cooling commands; and The valve control system according to claim 8.

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