Electric hydraulic gate valve control method and system

Abstract

The invention discloses an electric hydraulic gate valve control method and system.The method comprises the steps that firstly, according to the action mode of an electric hydraulic gate valve, position parameters of the electric hydraulic gate valve are obtained, the linear conversion relation between the position parameters and the valve opening degree is generated, and the current opening degree of the electric hydraulic gate valve is calculated according to the linear conversion relation; then acquiring data of the switching time and opening change of the electro-hydraulic gate valve, determining a first control period of the electro-hydraulic gate valve based on the data, acquiring a target opening of the electro-hydraulic gate valve, calculating an original deviation value of the current opening and the target opening, and finally controlling the opening of the electro-hydraulic gate valve according to the first control period and the original deviation value. And sending a timed switching instruction to the electric hydraulic control device according to a preset rule so as to instruct the electric hydraulic control device to drive the electric hydraulic gate valve to execute the switching action. By the adoption of the method, the control precision of coal dressing shunt flow adjustment and the safety of coal dressing operation can be improved.

Description

Technical Field

[0001] This invention relates to the field of valve control technology in the coal preparation industry, and in particular to an electro-hydraulic slide gate valve control method and system. Background Technology

[0002] In the industrial coal preparation process, raw coal needs to be separated. The separation process usually uses an electric hydraulic baffle plate to divert the flow. The distribution ratio of raw coal is determined by controlling the opening of the baffle plate.

[0003] However, current electro-hydraulic gate valve adjustment mainly relies on an electro-hydraulic device for driving. Operators change the gate valve position by starting and stopping the electro-hydraulic device, but the hydraulic drive rod cannot accurately reflect the valve position, and the hydraulic driving force is relatively large. Manual "jogging" control cannot guarantee the valve's control accuracy. Furthermore, control depends on manual operation or simple remote control, lacking automatic control logic based on dynamic adjustment of deviations. It cannot adaptively adjust the action duration according to the deviation between the actual gate valve opening and the target value, and it lacks real-time status monitoring and anomaly alarm functions, resulting in delayed maintenance response. Summary of the Invention

[0004] The purpose of this invention is to provide an electro-hydraulic slide gate valve control method and system, which improves the control accuracy and safety of the electro-hydraulic slide gate valve, thereby improving the control accuracy of coal preparation flow regulation and the safety of coal preparation operations.

[0005] To achieve the above objectives, the present invention provides an electro-hydraulic slide gate valve control method, comprising: Based on the operating mode of the electro-hydraulic slide gate valve, the position parameters of the electro-hydraulic slide gate valve are obtained, a linear conversion relationship between the position parameters and the valve opening is generated, and the current opening of the electro-hydraulic slide gate valve is calculated based on the linear conversion relationship. Acquire data on the opening and closing time and opening degree changes of the electro-hydraulic slide gate valve, and determine the first control cycle of the electro-hydraulic slide gate valve based on the data; Obtain the target opening degree of the electro-hydraulic slide gate valve, and calculate the original deviation value between the current opening degree and the target opening degree; Based on the first control cycle and the original deviation value, a timed switching command is sent to the electro-hydraulic control device according to a preset rule, instructing the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a switching action.

[0006] Optionally, after sending a timed switching command to the electro-hydraulic control device according to a preset rule based on the first control cycle and the original deviation value, to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a switching action, the method further includes: Calculate the real-time deviation between the current opening degree and the target opening degree when the electro-hydraulic slide gate valve performs the switching action; If the real-time deviation value exceeds the preset deviation threshold for a period of time exceeding the preset time threshold, an alarm will be triggered.

[0007] Optionally, when the electro-hydraulic slide gate valve operates by rotation, and the position parameter is the rotation angle of the electro-hydraulic slide gate valve, then the linear transformation relationship is: ; in, This represents the current opening degree of the electro-hydraulic slide gate valve. The current rotation angle of the electro-hydraulic slide gate valve. The rotation angle of the electro-hydraulic slide gate valve when it is fully closed. The rotation angle of the electro-hydraulic slide gate valve when it is fully open; When the electro-hydraulic slide gate valve operates in a translational manner, the position parameter is the translational distance of the electro-hydraulic slide gate valve, and the linear transformation relationship is: ; in, This represents the current opening degree of the electro-hydraulic slide gate valve. The current translation distance of the electro-hydraulic slide gate valve. The translational distance of the electro-hydraulic slide gate valve when it is fully closed. The translation distance is the distance when the electro-hydraulic slide gate valve is fully open.

[0008] Optionally, based on the first control cycle and the original deviation value, a timed switching command is sent to the electro-hydraulic control device according to a preset rule to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a switching action, including: When the original deviation value is greater than 10%, a valve closing command for a continuous control second cycle duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action. When the original deviation value is less than -10%, a valve opening command for a continuous control second cycle duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform the opening action. When the initial deviation value is greater than 3% and less than 10%, a valve-closing command lasting k control cycles is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action; wherein... ; When the original deviation value is greater than -10% and less than -3%, a valve opening command lasting k control cycles is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform the opening action. When the original deviation value is less than 3%, a valve closing command for a continuous control first cycle duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action. When the original deviation value is less than -3%, a valve closing command for a continuous control first cycle duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action.

[0009] Optionally, the second control cycle is the shortest duration during which the valve opening change of 10% caused by the opening action of the electro-hydraulic slide gate valve lasts.

[0010] Optionally, the preset deviation threshold is 1%, and the preset time threshold is the third control cycle; wherein, the third control cycle is 1.2 times the time required for the electro-hydraulic slide gate valve to perform the action from fully open to fully closed.

[0011] Optionally, the step of collecting data on the switching time and opening degree changes of the electro-hydraulic slide gate valve, and determining the first control cycle based on the data, includes: Starting from 1 second, the opening action of the electro-hydraulic slide gate valve is executed after decreasing by 100ms sequentially until the change in valve opening caused by a single opening action of the electro-hydraulic slide gate valve is less than or equal to the preset valve opening accuracy. The duration of this single opening action of the electro-hydraulic slide gate valve is then used as the first control cycle.

[0012] To achieve the above objectives, the present invention also provides an electro-hydraulic slide gate valve control system, including a sensor assembly, an electro-hydraulic control device, an electro-hydraulic slide gate valve, and an automatic controller; The sensor assembly is connected to the electro-hydraulic slide gate valve and is used to collect the position parameters of the electro-hydraulic slide gate valve. The automatic controller is connected to the sensor assembly and the electro-hydraulic control device respectively, and is used to execute the electro-hydraulic slide gate valve control method as described in any of the above claims; The electro-hydraulic control device is connected to the electro-hydraulic slide gate valve and is used to control the opening and closing action of the electro-hydraulic slide gate valve according to the opening and closing command sent by the automatic controller.

[0013] Optionally, when the electro-hydraulic slide gate valve moves in a rotary motion, the sensor assembly is an angle sensor; When the movement mode of the electro-hydraulic slide gate valve is translational, the sensor assembly is a rangefinder.

[0014] Optionally, the electro-hydraulic slide gate valve control system further includes a display module; The display module is connected to the automatic controller and is used to input the target opening degree of the electro-hydraulic slide gate valve and display the status information and alarm information of the electro-hydraulic slide gate valve.

[0015] Compared with existing technologies, the present invention provides an electro-hydraulic slide gate valve control method and system. First, position parameters are obtained based on the valve's actuation mode, and a linear conversion relationship between these parameters and valve opening is established to calculate the current opening. Then, the first control cycle is determined by acquiring switching time and opening change data. Next, the target opening is obtained, and the original deviation between the current opening and the target opening is calculated. Finally, based on the first control cycle and the original deviation, a timed switching command is sent to the electro-hydraulic control device according to preset rules, driving the valve to perform the corresponding action. By adapting to valves with different actuation modes and establishing a linear conversion relationship, combined with a data-based control cycle and graded preset rules, this invention can achieve precise control of valve opening, improve the versatility and reliability of electro-hydraulic slide gate valve control, and effectively improve the control accuracy of coal preparation flow regulation. Attached Figure Description

[0016] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart of an electro-hydraulic slide gate valve control method provided in an embodiment of the present invention; Figure 2 This is a structural block diagram of an electro-hydraulic slide gate valve control system provided in an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] See Figure 1 , Figure 1This is a flowchart of an electro-hydraulic slide gate valve control method provided in an embodiment of the present invention. Figure 1 As shown, the electro-hydraulic slide gate valve control method includes steps S1 to S4: S1. Based on the operating mode of the electro-hydraulic slide gate valve, obtain the position parameters of the electro-hydraulic slide gate valve, generate a linear conversion relationship between the position parameters and the valve opening, and calculate the current opening of the electro-hydraulic slide gate valve based on the linear conversion relationship; It should be noted that in existing coal preparation processes, electro-hydraulic slide gate valves are generally opened and closed by moving the electro-hydraulic control device forward and backward. The operation of electro-hydraulic slide gate valves generally involves two methods: rotation and translation.

[0020] Therefore, in one optional embodiment, when the electro-hydraulic slide gate valve operates by rotation, the position parameter is the rotation angle of the electro-hydraulic slide gate valve, and the linear transformation relationship is: ; in, This represents the current opening degree of the electro-hydraulic slide gate valve. The current rotation angle of the electro-hydraulic slide gate valve. The rotation angle of the electro-hydraulic slide gate valve when it is fully closed. The rotation angle of the electro-hydraulic slide gate valve when it is fully open; When the electro-hydraulic slide gate valve operates in a translational manner, the position parameter is the translational distance of the electro-hydraulic slide gate valve, and the linear transformation relationship is: ; in, This represents the current opening degree of the electro-hydraulic slide gate valve. The current translation distance of the electro-hydraulic slide gate valve. The translational distance of the electro-hydraulic slide gate valve when it is fully closed. The translation distance is the distance when the electro-hydraulic slide gate valve is fully open.

[0021] It is worth noting that, by establishing a linear correspondence between rotation angle (or translation distance) and valve opening, this embodiment of the invention can transform abstract mechanical motion parameters (angle values, distance values) into intuitive opening percentages, solving the problem that "mechanical motion states cannot directly correspond to control targets" and providing a quantitative basis for subsequent precise control. Furthermore, corresponding linear conversion logic is designed for both rotation and translation actions, allowing the same control logic to be adapted to electro-hydraulic slide gate valves with different structures. This eliminates the need to redesign the core conversion algorithm for different valve action methods, reducing the adaptation cost of the control scheme. The linear conversion relationship ensures that the raw data collected by the sensor can be stably converted into the "current opening" parameter, which is a prerequisite for the automatic controller to calculate the "deviation between the current opening and the target opening," and based on this, triggers rule-based control in subsequent steps (such as sending valve opening commands), ensuring the orderly execution of the control logic.

[0022] For example, when the electro-hydraulic slide gate valve operates by rotation, an angle sensor can be used to measure the rotation angle of the valve. When the electro-hydraulic slide gate valve is fully closed, the measured rotation angle value is a1, and the corresponding valve opening is set to 0. When the electro-hydraulic slide gate valve is fully open, the measured rotation angle value is a2, and the corresponding valve opening is set to 100%. Therefore, a linear conversion relationship between the rotation angle and the valve opening is established; that is, when the rotation angle value is a, the valve opening is... .

[0023] For example, when the electro-hydraulic slide gate valve operates in a translational manner, a rangefinder sensor can be used to measure the translational distance of the electro-hydraulic slide gate valve. When the electro-hydraulic slide gate valve is fully closed, the translational distance value is measured as b1, and the corresponding valve opening is set to 0; when the electro-hydraulic slide gate valve is fully open, the translational distance value is measured as b2, and the corresponding valve opening is set to 100%. Therefore, a linear conversion relationship between translational distance and valve opening is established, that is, when the translational distance value is b, the valve opening is... .

[0024] S2. Obtain data on the opening and closing time and opening degree changes of the electro-hydraulic slide gate valve, and determine the first control cycle of the electro-hydraulic slide gate valve based on the data; In one optional embodiment, step S2 includes: Starting from 1 second, the opening action of the electro-hydraulic slide gate valve is executed after decreasing by 100ms sequentially until the change in valve opening caused by a single opening action of the electro-hydraulic slide gate valve is less than or equal to the preset valve opening accuracy. The duration of this single opening action of the electro-hydraulic slide gate valve is then used as the first control cycle.

[0025] Preferably, a valve control safety protection program can be established to stop the valve from operating when the valve opening is ≥100% or ≤0, or when the valve action time exceeds 1 second.

[0026] For example, with safety protection procedures set up, data on the switching time and valve opening degree changes of an electro-hydraulic slide gate valve are remotely tested and collected.

[0027] First, set the valve's single actuation time to 1 second (a relatively long duration). Control the electro-hydraulic device to move in the "open" or "close" direction for 1 second, and record the change in valve opening during this time (e.g., a change of 10%). If the change exceeds the control precision (e.g., 1%), the time is too long and needs to be reduced. Then, decrease the time by 100ms each time in the sequence of "900ms, 800ms, ..., 300ms, 200ms, 100ms", and repeat the test. For each test, control the valve to move for the current time length (e.g., 900ms) and record the corresponding change in opening. Observe whether the change is ≤1%. If it is still >1% (e.g., a change of 2% at 300ms), continue to reduce the time; if it is ≤1% (e.g., a change of 0.8% at 200ms), pause the test. When the test reaches "200ms", the valve's opening change in a single action is ≤1% (meeting control accuracy); however, if it is further reduced to 100ms, the action time may be too short, and the hydraulic device may not complete the effective stroke (the opening change is close to 0, making fine-tuning impossible). Therefore, in this embodiment of the invention, 200ms is determined as the first control cycle T1 of the electro-hydraulic slide gate valve.

[0028] It is worth noting that this process involves finding the minimum action time that "meets both control accuracy and effectively adjusts the opening" through testing, i.e., the first control cycle T1, to provide a key time parameter benchmark for subsequent graded control.

[0029] S3. Obtain the target opening degree of the electro-hydraulic slide gate valve, and calculate the original deviation value between the current opening degree and the target opening degree; For example, the current opening degree PV of the electro-hydraulic slide gate valve is first calculated through a linear transformation relationship, and then the target opening degree SP, which is manually input or preset, is obtained. The original deviation value E=PV-SP between the current opening degree and the target opening degree is then calculated.

[0030] S4. Based on the first control cycle and the original deviation value, send a timed switching command to the electro-hydraulic control device according to a preset rule to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a switching action.

[0031] In one optional embodiment, step S4 specifically includes: When the original deviation value is greater than 10%, a valve closing command for a continuous control second cycle T2 duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action. When the original deviation value is less than -10%, a valve opening command with a duration of continuous control second cycle T2 is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform the opening action. When the initial deviation value is greater than 3% and less than 10%, a valve-closing command lasting k control cycles T1 is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action; wherein... ; When the original deviation value is greater than -10% and less than -3%, a valve opening command is sent to the electro-hydraulic control device for a duration of k control first cycles T1, instructing the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform the opening action. When the original deviation value is less than 3%, a valve closing command for a continuous control first cycle T1 duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action. When the original deviation value is less than -3%, a valve closing command for a continuous control period of T1 is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action.

[0032] For example, when the original deviation value is less than -3%, a valve closing command is sent to the electro-hydraulic control device, and a timer is started. The timer duration can be set to Time1 = T1, indicating that the electro-hydraulic control device drives the electro-hydraulic slide gate valve to perform the closing action for a duration of T1. Other cases are similar.

[0033] It should be noted that, to avoid repeated valve operation due to the inertia of the electro-hydraulic valve, the duration of each operation is set according to the deviation between the current valve opening and the target opening. That is, the smaller the deviation, the shorter the time for each forward and backward movement of the valve. The magnitude of the deviation is determined based on the actual inertia of the hydraulic valve. The operating time is determined by ensuring that each forward or backward movement does not exceed the target value.

[0034] In this embodiment of the invention, the original deviation values ​​are mainly divided into two values: 10% and 3%. These values ​​are determined based on the magnitude of the continued change in valve position caused by the inertial motion corresponding to the stop of forward and backward movement of the electro-hydraulic valve. These values ​​were given by the inventors based on certain experimental data with a certain margin. Specifically, 10% represents the magnitude of the change in valve opening due to inertia after the valve is withdrawn from 100% closed to 10%; 3% represents the magnitude of the change in valve opening due to inertia after the valve is opened or decreased by 10% and the command is withdrawn. The main objective of these parameters is to prevent frequent and repetitive valve movements caused by valve inertia. The ratio k is the ratio of the time required for the valve opening to change to 3% to the first control cycle T1, and a smaller value is selected, typically 2 to 4.

[0035] In one alternative embodiment, the control second cycle T2 is the minimum duration during which the valve opening change of 10% caused by the opening action of the electro-hydraulic slide gate valve lasts.

[0036] It should be noted that the shortest time required for the valve to complete a 10% opening change from its current position can be found through actual testing similar to step S2 described above. This time can then be used as the control second cycle T2. Its purpose is to ensure that adjustments under large deviation scenarios can quickly reduce the deviation without exceeding the adjustment range.

[0037] It is worth noting that, in this embodiment of the invention, the original deviation value is divided into multiple intervals (>10%, 3%~10%, <3% and corresponding negative intervals), and control commands of different durations (T2, k×T1, T1) are matched to achieve graded adjustment where "the larger the deviation, the larger the action amplitude; the smaller the deviation, the smaller the action amplitude." This "step-like" adjustment can avoid "overshooting" or "too slow adjustment" caused by a single action duration, ultimately controlling the valve opening within a precision range of deviation ≤1%. This rule is based on a direct mapping of "deviation interval + corresponding duration," allowing the automatic controller to quickly determine the interval to which the deviation belongs and output commands, resulting in high execution efficiency.

[0038] In an optional embodiment, after step S4, the electro-hydraulic slide gate valve control method further includes: Calculate the real-time deviation between the current opening degree and the target opening degree when the electro-hydraulic slide gate valve performs the switching action; If the real-time deviation value exceeds the preset deviation threshold for a period of time exceeding the preset time threshold, an alarm will be triggered.

[0039] Preferably, the preset deviation threshold is 1%, and the preset time threshold is the third control cycle T3; wherein, the third control cycle is 1.2 times the time required for the electro-hydraulic slide gate valve to perform the fully open to fully closed action. For example, in this embodiment of the invention, the time required for the valve to perform the fully open to fully closed action is 1.25 seconds, then T3 = 1.5 seconds.

[0040] It is worth noting that by calculating the real-time deviation between the current opening degree and the target opening degree and setting an alarm condition of "deviation > 1% and continuously exceeding T3", the abnormal situation of "the control logic is executing normally but the deviation cannot be eliminated" can be quickly identified, which can improve the reliability of the electro-hydraulic slide gate valve control and ensure the continuity of the coal preparation process.

[0041] In summary, the electro-hydraulic slide gate valve control method provided by this invention first obtains position parameters based on the valve's actuation mode, establishes a linear conversion relationship between these parameters and the valve opening degree to calculate the current opening degree; then, it determines the first control cycle by acquiring switching time and opening degree change data; next, it acquires the target opening degree and calculates the original deviation value between the current opening degree and the target opening degree; finally, based on the first control cycle and the original deviation value, it sends a timed switching command to the electro-hydraulic control device according to preset rules, driving the valve to perform the corresponding action. This invention, by adapting to valves with different actuation modes and establishing a linear conversion relationship, combined with a data-based control cycle and hierarchical preset rules, can achieve precise control of the valve opening degree, improve the versatility and reliability of electro-hydraulic slide gate valve control, and effectively meet the requirements for valve opening degree adjustment accuracy.

[0042] Based on the above method items, the present invention provides corresponding system items embodiments.

[0043] See Figure 2 , Figure 2 This is a structural block diagram of an electro-hydraulic slide gate valve control system provided in an embodiment of the present invention. Figure 2 As shown, the electro-hydraulic slide gate valve control system 200 includes a sensor assembly 201, an electro-hydraulic control device 202, an electro-hydraulic slide gate valve 203, and an automatic controller 204. The sensor assembly 201 is connected to the electro-hydraulic slide gate valve 203 and is used to collect the position parameters of the electro-hydraulic slide gate valve 203. The automatic controller 204 is connected to the sensor assembly 201 and the electro-hydraulic control device 202 respectively, and is used to execute the electro-hydraulic slide gate valve control method as described in any of the above embodiments. The electro-hydraulic control device 202 is connected to the electro-hydraulic slide gate valve 203 and is used to control the opening and closing action of the electro-hydraulic slide gate valve 203 according to the opening and closing command sent by the automatic controller 204.

[0044] In one optional embodiment, when the electro-hydraulic slide gate valve 203 moves in a rotary motion, the sensor assembly 201 is an angle sensor; When the electro-hydraulic slide gate valve 203 moves in a translational motion, the sensor assembly 201 is a rangefinder.

[0045] For example, select the appropriate sensing device based on the actuation method of the electro-hydraulic slide gate valve. For rotation, select an angle sensor and install it on the rotation axis of the electro-hydraulic slide gate valve to measure the change in the valve's rotation angle. For parallel movement, select a rangefinder. One end of the rangefinder can be fixed to the electro-hydraulic slide gate valve and move with the valve, while the other end is fixed in a fixed straight position. Then, debug the electro-hydraulic device, and manually control the valve movement by moving it forward and backward in the control box. Then, connect the angle measuring or rangefinder sensor, the electro-hydraulic control device, the electro-hydraulic slide gate valve, and the automatic controller to build the electro-hydraulic slide gate valve control system.

[0046] In one optional embodiment, the electro-hydraulic slide gate valve control system 200 further includes a display module 205; The display module 205 is connected to the automatic controller 204 and is used to input the target opening degree of the electro-hydraulic slide gate valve 203 and display the status information and alarm information of the electro-hydraulic slide gate valve 203.

[0047] For example, a human-machine interface display module 205 can be established to display the remote / local control mode of the electro-hydraulic control device and the corresponding automatic / manual mode of the electro-hydraulic slide gate valve control on the screen.

[0048] It should be noted that "remote / local mode" refers to the control mode for the forward and backward movement of the electro-hydraulic slide gate valve, i.e., whether it is operated locally by the electrical control box or by the automatic controller 204. "Manual / automatic mode" refers to the valve position control mode of the electro-hydraulic slide gate valve, whether it automatically moves forward and backward based on the set valve position target, or manually moves forward and backward based on the valve position feedback value. The prerequisite for manual / automatic valve position control is that the electro-hydraulic device is in remote mode; in local mode, automatic operation of the automatic controller 204 is not possible.

[0049] For example, in automatic valve position mode, a target valve opening value is set, and the current valve opening is displayed in real time. In automatic mode, if the real-time deviation between the current opening and the target opening is greater than 1% of the control accuracy and the duration exceeds T3, an alarm message is given through the display module 205.

[0050] It should be noted that the electro-hydraulic slide gate valve control system provided in this embodiment of the invention is used to execute all the process steps of the electro-hydraulic slide gate valve control method of the above embodiment. The working principle and beneficial effects of the two are corresponding, so they will not be described again.

[0051] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for controlling an electro-hydraulic slide gate valve, characterized in that, include: Based on the operating mode of the electro-hydraulic slide gate valve, the position parameters of the electro-hydraulic slide gate valve are obtained, a linear conversion relationship between the position parameters and the valve opening is generated, and the current opening of the electro-hydraulic slide gate valve is calculated based on the linear conversion relationship. Acquire data on the opening and closing time and opening degree changes of the electro-hydraulic slide gate valve, and determine the first control cycle of the electro-hydraulic slide gate valve based on the data; Obtain the target opening degree of the electro-hydraulic slide gate valve, and calculate the original deviation value between the current opening degree and the target opening degree; Based on the first control cycle and the original deviation value, a timed switching command is sent to the electro-hydraulic control device according to a preset rule, instructing the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a switching action.

2. The electro-hydraulic slide gate valve control method as described in claim 1, characterized in that, After sending a timed switching command to the electro-hydraulic control device according to a preset rule based on the first control cycle and the original deviation value, to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a switching action, the method further includes: Calculate the real-time deviation between the current opening degree and the target opening degree when the electro-hydraulic slide gate valve performs the switching action; If the real-time deviation value exceeds the preset deviation threshold for a period of time exceeding the preset time threshold, an alarm will be triggered.

3. The electro-hydraulic slide gate valve control method as described in claim 1, characterized in that, When the electro-hydraulic slide gate valve operates by rotation, and the position parameter is the rotation angle of the electro-hydraulic slide gate valve, then the linear transformation relationship is: ； in, This represents the current opening degree of the electro-hydraulic slide gate valve. The current rotation angle of the electro-hydraulic slide gate valve. The rotation angle of the electro-hydraulic slide gate valve when it is fully closed. The rotation angle of the electro-hydraulic slide gate valve when it is fully open; When the electro-hydraulic slide gate valve operates in a translational manner, the position parameter is the translational distance of the electro-hydraulic slide gate valve, and the linear transformation relationship is: ； in, This represents the current opening degree of the electro-hydraulic slide gate valve. The current translation distance of the electro-hydraulic slide gate valve. The translational distance of the electro-hydraulic slide gate valve when it is fully closed. The translation distance is the distance when the electro-hydraulic slide gate valve is fully open.

4. The electro-hydraulic slide gate valve control method as described in claim 3, characterized in that, Based on the first control cycle and the original deviation value, a timed switching command is sent to the electro-hydraulic control device according to a preset rule to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a switching action, including: When the original deviation value is greater than 10%, a valve closing command for a continuous control second cycle duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action. When the original deviation value is less than -10%, a valve opening command for a continuous control second cycle duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform the opening action. When the initial deviation value is greater than 3% and less than 10%, a valve-closing command lasting k control cycles is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action; wherein... ; When the original deviation value is greater than -10% and less than -3%, a valve opening command lasting k control cycles is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform the opening action. When the original deviation value is less than 3%, a valve closing command for a continuous control first cycle duration is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action. When the original deviation value is less than -3%, a valve closing command for a continuous control period of the first cycle is sent to the electro-hydraulic control device to instruct the electro-hydraulic control device to drive the electro-hydraulic slide gate valve to perform a closing action.

5. The electro-hydraulic slide gate valve control method as described in claim 4, characterized in that, The second control cycle is the shortest duration during which the valve opening change of 10% caused by the opening action of the electro-hydraulic slide gate valve lasts.

6. The electro-hydraulic slide gate valve control method as described in claim 2, characterized in that, The preset deviation threshold is 1%, and the preset time threshold is the third control cycle; wherein, the third control cycle is 1.2 times the time required for the electro-hydraulic slide gate valve to perform the action of fully opening to fully closing.

7. The electro-hydraulic slide gate valve control method as described in claim 1, characterized in that, The process of collecting data on the switching time and opening degree changes of the electro-hydraulic slide gate valve, and determining the first control cycle based on the data, includes: Starting from 1 second, the opening action of the electro-hydraulic slide gate valve is executed after decreasing by 100ms sequentially until the change in valve opening caused by a single opening action of the electro-hydraulic slide gate valve is less than or equal to the preset valve opening accuracy. The duration of this single opening action of the electro-hydraulic slide gate valve is then used as the first control cycle.

8. An electro-hydraulic slide gate valve control system, characterized in that, Includes sensor components, electro-hydraulic control devices, electro-hydraulic slide gate valves, and automatic controllers; The sensor assembly is connected to the electro-hydraulic slide gate valve and is used to collect the position parameters of the electro-hydraulic slide gate valve. The automatic controller is connected to the sensor assembly and the electro-hydraulic control device respectively, and is used to execute the electro-hydraulic slide gate valve control method as described in any one of claims 1 to 7; The electro-hydraulic control device is connected to the electro-hydraulic slide gate valve and is used to control the opening and closing action of the electro-hydraulic slide gate valve according to the opening and closing command sent by the automatic controller.

9. The electro-hydraulic slide gate valve control system as described in claim 8, characterized in that, When the electro-hydraulic slide gate valve moves in a rotary motion, the sensor assembly is an angle sensor; When the movement mode of the electro-hydraulic slide gate valve is translational, the sensor assembly is a rangefinder.

10. The electro-hydraulic slide gate valve control system as described in claim 8, characterized in that, It also includes a display module; The display module is connected to the automatic controller and is used to input the target opening degree of the electro-hydraulic slide gate valve and display the status information and alarm information of the electro-hydraulic slide gate valve.

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