An overflow table hole gate double opening monitoring and pressure linkage deviation control system

Abstract

The application discloses a kind of overflow orifice gate double-opening monitoring and pressure linkage deviation control systems, it is related to water conservancy gate control technical field, including gate body, hydraulic drive unit, double set opening monitoring device, oil cylinder pressure transmitter, PLC main control system and proportional valve drive execution module.The application is independently collected gate opening and left and right oil cylinder pressure data by double set equipment, relies on PLC system linkage to distinguish opening difference and oil cylinder pressure difference, distinguishes encoder failure and gate actual deflection working condition, can automatically switch control loop, and adopts opening coarse adjustment, pressure fine adjustment hierarchical deviation correction mode, accurately adjusts hydraulic oil supply.Effectively solve the problem that traditional gate synchronous control deviation is big, fault identification is not accurate, deviation correction precision is low, guarantee gate lifting synchronism and operating stability, improve the safety and reliability of water conservancy gate operation.

Description

Technical Field

[0001] This invention relates to the field of hydraulic gate control technology, and in particular to a double-opening monitoring and pressure-linked correction control system for an overflow orifice gate. Background Technology

[0002] Currently, existing overflow orifice hydraulic gate control systems generally suffer from the following technical defects:

[0003] (1) No redundancy in opening degree monitoring: Only a single-channel opening degree encoder is configured to collect the opening degree. There is no backup monitoring circuit. After sensor drift, line interference, or component damage, the system cannot distinguish whether the abnormal value is due to equipment failure or actual gate deviation. It is very easy to make false corrections or false shutdowns.

[0004] (2) The control logic is simple and only relies on the opening degree as the correction criterion: The current correction system uses the opening degree difference as the only control basis. The hydraulic cylinder pressure data is not connected to the PLC for calculation. When the gate is subjected to uneven load due to water flow and water stop jamming, the hydraulic cylinder has already experienced pressure difference, but the opening degree has not yet produced a significant deviation. The system cannot predict and intervene in advance. When the opening degree exceeds the tolerance, the correction is carried out. The hydraulic cylinder is subjected to uneven load for a long time, which can easily cause piston rod damage and gate jamming.

[0005] (3) No cross-verification means for fault identification: When the measured opening exceeds the standard, it is impossible to distinguish the source of the fault: whether it is the encoder measurement failure or the gate is actually out of sync. Only on-site manual shutdown and troubleshooting are possible, which results in low operation and maintenance efficiency and affects the continuity of flood discharge scheduling.

[0006] (4) Pressure and opening are disconnected: the cylinder pressure gauge is only read visually on site, the pressure signal cannot be uploaded to the control system, the oil pressure cannot be used to verify the cause of abnormal opening, the correction is blind, overshoot and oscillation occur frequently, and the control stability is poor. Summary of the Invention

[0007] The present invention aims to at least partially solve one of the technical problems in the related art.

[0008] The main objective of this invention is to provide a control system for monitoring the double opening degree of an overflow orifice gate and for pressure-linked correction.

[0009] To achieve the above objectives, this invention proposes a dual-opening monitoring and pressure-linked correction control system for an overflow orifice gate, comprising: a gate body, a hydraulic drive unit, a main opening encoder (A set), a backup opening monitoring device (B set), a left hydraulic cylinder pressure transmitter, a right hydraulic cylinder pressure transmitter, a PLC main control system, and a proportional valve drive execution module; wherein: The hydraulic drive unit includes a left opening and closing cylinder and a right opening and closing cylinder, which drive the left and right sides of the gate to rise and fall synchronously, respectively. The A set of main opening encoders and the B set of backup opening monitoring devices are respectively installed on the gate opening and closing mechanism, and are used to independently collect gate opening data and send it to the PLC main control system. The left cylinder pressure transmitter and the right cylinder pressure transmitter are respectively installed on the hydraulic lines of the left and right cylinders, and are used to collect the pressure values ​​of the left and right cylinders and send them to the PLC main control system. The PLC main control system is used to receive opening data and pressure data, calculate the opening difference ΔS and the cylinder pressure difference ΔP, and complete the operation status judgment, control loop switching and correction control based on the opening difference ΔS and the cylinder pressure difference ΔP. The proportional valve drive module adjusts the oil supply of the hydraulic drive unit according to the control signal output by the PLC main control system to realize gate correction control.

[0010] Optionally, the PLC main control system includes a dual-opening data comparison module, a pressure-opening linkage discrimination module, a control loop automatic switching module, and a correction control module; The dual-aperture data comparison module is used to compare the aperture data collected by the main aperture encoder (set A) and the backup aperture monitoring device (set B) in real time. The pressure-opening degree linkage discrimination module is used to perform state discrimination by combining the opening degree difference ΔS and the cylinder pressure difference ΔP. The automatic control loop switching module is used to switch the control loop when the main opening encoder of Set A fails. The correction control module is used to execute the correction control program.

[0011] Optionally, during normal system operation, the opening data collected by the main opening encoder of set A is used as the main control signal, and the opening data is collected synchronously by the backup opening monitoring device of set B. The PLC main control system calculates the opening difference ΔS and the cylinder pressure difference ΔP in real time. When both ΔS and ΔP are within the preset allowable range, the proportional valve drive execution module maintains the reference output state.

[0012] Optionally, when the opening difference ΔS exceeds the preset warning threshold, the PLC main control system starts the joint opening and pressure fault judgment program; When the pressure difference ΔP of the hydraulic cylinder is not greater than the allowable limit of the pressure difference, it is determined that the main opening encoder of set A has failed. The automatic control loop switching module switches the control loop to the backup opening monitoring device of set B and outputs a fault alarm signal for the main opening encoder of set A.

[0013] Optionally, when the opening difference ΔS exceeds the preset warning threshold and the cylinder pressure difference ΔP is greater than the pressure difference allowable limit, it is determined that there is actual deflection of the gate. The PLC main control system uses the opening difference ΔS as the main condition for starting the correction and the cylinder pressure difference ΔP as the auxiliary condition for correction, and starts the correction control program.

[0014] Optionally, the correction control program includes a coarse adjustment stage for the opening and a fine adjustment stage for the pressure. When the opening difference ΔS reaches the coarse adjustment threshold, the coarse adjustment stage begins. The PLC main control system calculates the coarse adjustment output based on the opening difference ΔS and adjusts the output of the proportional valve drive execution module to reduce the difference between the left and right openings of the gate. The coarse adjustment stage of the opening degree only uses the opening degree difference ΔS as the adjustment basis.

[0015] Optionally, when the opening difference ΔS falls back to within the fine-tuning threshold, the system switches from the coarse opening adjustment stage to the pressure fine-tuning stage. The pressure fine-tuning stage uses the cylinder pressure difference ΔP as the sole fine-tuning correction amount. The output of the actuator is adjusted by adjusting the proportional valve to balance the force on the left and right cylinders.

[0016] Optionally, the pressure fine-tuning stage includes two modes: mild overpressure fine-tuning and severe overpressure fine-tuning. When the cylinder pressure difference ΔP is within the first preset range, a slight overpressure fine-tuning mode is adopted to slightly correct the output of the proportional valve drive execution module. When the cylinder pressure difference ΔP is within the second preset range, the severe overpressure fine-tuning mode is adopted to increase the output of the proportional valve drive execution module.

[0017] Optionally, when both the opening difference ΔS and the cylinder pressure difference ΔP return to the preset acceptable range, the PLC main control system terminates the correction control program and controls the proportional valve drive execution module to return to the reference output state. The embodiments of the present invention have the following beneficial effects: (1) Improve monitoring reliability: The two sets of opening degree acquisition devices A and B with different principles serve as backups for each other. The main circuit will automatically switch to backup in case of failure, thus preventing system loss of control caused by single-point monitoring failure.

[0018] (2) Dual-parameter cross-identification of faults: When the opening is abnormal, the pressure difference between the left and right cylinders is used to assist in tracing the source: if the pressure difference is normal, the opening sensor is determined to be faulty, and the backup circuit is automatically switched; if the pressure difference synchronization exceeds the limit, the actual gate deviation is determined, and the correction is immediately started to completely eliminate malfunctions. Improved operation and maintenance convenience: It is equipped with fault alarm and remote upload functions, and provides real-time feedback on the fault type, which greatly shortens the fault investigation time, reduces the difficulty of operation and maintenance, and improves the efficiency of gate operation and management.

[0019] (3) The two-stage segmented correction method of coarse opening adjustment and fine pressure adjustment is adopted. Large deviations are quickly reduced by coarse opening adjustment, and small residual deviations are finely corrected by cylinder pressure. The correction is stable and without overshoot, and the synchronous control accuracy is greatly improved. Attached Figure Description

[0020] The above-described and additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 A schematic diagram of the control structure of a double opening monitoring and pressure-linked correction control system for an overflow orifice gate provided in an embodiment of the present invention; Figure 2 The diagram shows the principle of the correction oil circuit provided in the embodiment of the present invention. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0023] This embodiment provides a dual opening monitoring and pressure-linked correction control system for an overflow orifice gate, including a gate body, a hydraulic drive unit, a set of A main opening encoders, a set of B backup opening monitoring devices, a left cylinder pressure transmitter, a right cylinder pressure transmitter, a PLC main control system, and a proportional valve drive execution module. The hydraulic drive unit includes a left opening and closing cylinder and a right opening and closing cylinder, which drive the left and right sides of the gate to rise and fall synchronously, respectively. The A set of main opening encoders and the B set of backup opening monitoring devices are respectively installed on the gate opening and closing mechanism, and are used to independently collect gate opening data and send it to the PLC main control system. The left cylinder pressure transmitter and the right cylinder pressure transmitter are respectively installed on the hydraulic lines of the left and right cylinders, and are used to collect the pressure values ​​of the left and right cylinders and send them to the PLC main control system. The PLC main control system is used to receive opening data and pressure data, calculate the opening difference ΔS and the cylinder pressure difference ΔP, and complete the operation status judgment, control loop switching and correction control based on the opening difference ΔS and the cylinder pressure difference ΔP. The proportional valve drive module adjusts the oil supply of the hydraulic drive unit according to the control signal output by the PLC main control system to realize gate correction control.

[0024] It should be noted that, Figure 1The hydraulic power unit shown is an existing structure, which generally consists of an oil tank, an oil pump, and oil circuits. This application will not elaborate on this aspect further.

[0025] Specifically, in this embodiment, the PLC main control system includes a dual-opening data comparison module, a pressure-opening linkage discrimination module, a control loop automatic switching module, and a correction control module.

[0026] Among them, the A set of main opening encoders and the B set of backup opening monitoring devices independently monitor the operating status of the gate opening and closing mechanism using different opening acquisition principles. The two sets of opening data are transmitted to the PLC main control system respectively. The left cylinder pressure transmitter and the right cylinder pressure transmitter are installed on the hydraulic pipelines corresponding to the left and right opening and closing cylinders, respectively, to convert the hydraulic pressure signal into an electrical signal and upload it to the PLC main control system, thereby realizing the real-time digital acquisition of the pressure parameters of the left and right cylinders.

[0027] After receiving two sets of opening data and two pressure data streams, the PLC main control system processes the data through a dual opening data comparison module and a pressure-opening linkage discrimination module. Specifically, the PLC main control system calculates the opening difference ΔS based on the left and right opening detection values ​​and the cylinder pressure difference ΔP based on the left and right cylinder pressure detection values. These two values ​​are then used as the basis for subsequent operational status identification and corrective control.

[0028] In this embodiment, the system operating status includes normal operating status, fault diagnosis status, and error correction control status.

[0029] Under normal operating conditions, the PLC main control system uses the opening data collected by the A set of main opening encoders as the main control signal by default. The B set of backup opening monitoring devices continuously and synchronously collects opening data and participates in real-time comparison as backup monitoring signals. At the same time, the left cylinder pressure transmitter and the right cylinder pressure transmitter continuously feed back pressure data to the PLC main control system.

[0030] The PLC main control system periodically calculates the opening difference ΔS and the cylinder pressure difference ΔP, and compares them with preset allowable ranges. When both the opening difference ΔS and the cylinder pressure difference ΔP are within the allowable range, the gate is determined to be in synchronous operation. At this time, the PLC main control system maintains the reference output control parameters of the proportional valve drive execution module unchanged, and the proportional valve supplies oil to the left and right opening and closing cylinders according to the set flow rate to ensure that the gate operates stably at the predetermined opening and closing speed.

[0031] When the PLC main control system detects that the opening difference ΔS exceeds the preset warning threshold, it starts the pressure-opening linkage discrimination program to identify the cause of the abnormality.

[0032] Specifically, the PLC main control system first reads the cylinder pressure difference ΔP corresponding to the current moment and compares the cylinder pressure difference ΔP with the allowable pressure difference limit.

[0033] When the cylinder pressure difference ΔP is not greater than the allowable limit, it indicates that the forces on the left and right opening and closing cylinders are basically the same, the hydraulic system does not show obvious off-center loading, and the actual operation of the gate remains synchronized. At this time, the abnormal opening degree mainly comes from the deviation of the opening degree detection signal. Based on this, the PLC main control system determines that the A set of main opening degree encoders is abnormal and calls the control loop automatic switching module to switch the control signal source, using the opening degree data output by the B set of backup opening degree monitoring devices as the new main control signal. At the same time, the PLC main control system generates fault alarm information for the A set of main opening degree encoders and uploads it to the monitoring platform to prompt maintenance personnel to carry out maintenance, while the gate control process continues to operate continuously.

[0034] When the cylinder pressure difference ΔP exceeds the allowable limit, it indicates a significant difference in load on the left and right opening / closing cylinders, resulting in uneven loading of the hydraulic drive system and a tendency for the gate to operate asynchronously or skewed. At this point, the PLC main control system uses the opening difference ΔS as the primary criterion for corrective action and the cylinder pressure difference ΔP as the auxiliary correction parameter, initiating the corrective control module to execute the corrective control program.

[0035] In this embodiment, the correction control program adopts a phased control method, including a coarse adjustment stage for opening and a fine adjustment stage for pressure.

[0036] When the opening difference ΔS reaches the preset coarse adjustment threshold, the PLC main control system executes coarse opening adjustment control. This stage aims to quickly reduce the opening difference between the left and right sides of the gate, using only the opening difference ΔS in the control calculations.

[0037] In specific implementation, refer to Figure 2 The PLC main control system calculates the corresponding coarse adjustment output based on the real-time detected opening difference ΔS, and corrects the output voltage of the proportional valve drive module based on the reference control parameters. For the side with a larger opening, the corresponding proportional valve control output is appropriately reduced; for the side with a smaller opening, the corresponding proportional valve control output is appropriately increased, thereby changing the drive speed of the left and right opening and closing cylinders. This causes the side with a lagging opening to run faster and the side with a leading opening to run slower, achieving rapid convergence of the opening difference ΔS.

[0038] As the correction process continues, the PLC main control system continuously collects opening data and updates the opening difference ΔS in real time. When the opening difference ΔS decreases to within the preset fine-tuning threshold, it indicates that most of the opening deviation has been eliminated. At this point, the PLC main control system ends the coarse opening control and enters the pressure fine-tuning control stage.

[0039] The pressure fine-tuning stage aims to eliminate residual off-center load and residual asynchronous amount, and the control basis is switched from the opening difference ΔS to the cylinder pressure difference ΔP.

[0040] The PLC main control system calculates the pressure difference ΔP between the left and right cylinders in real time and selects the corresponding fine-tuning strategy according to the magnitude of the pressure difference. When the cylinder pressure difference ΔP is within the first preset pressure difference range, a slight overpressure fine-tuning control is executed; the PLC main control system makes a small adjustment to the proportional valve output according to the first correction coefficient, so that the force on the left and right cylinders gradually tends to be balanced.

[0041] When the cylinder pressure difference ΔP is within the second preset pressure difference range, severe overpressure fine-tuning control is executed; the PLC main control system corrects the proportional valve output according to the second correction coefficient, which is greater than the first correction coefficient, in order to improve the force balance adjustment speed and accelerate the elimination of residual off-center load.

[0042] Throughout the pressure fine-tuning process, the PLC main control system continuously monitors the pressure changes of the left and right cylinders and dynamically updates the output parameters of the proportional valve drive execution module, so that the force state of the left and right cylinders gradually becomes consistent, thereby eliminating residual asynchrony caused by load differences, hydraulic characteristic differences or mechanical resistance differences.

[0043] When the PLC main control system detects that the opening difference ΔS has returned to the preset acceptable opening range and the cylinder pressure difference ΔP has returned to the preset acceptable pressure difference range, it determines that the gate synchronization state has returned to normal. At this time, the PLC main control system exits the correction control program, cancels the correction adjustment, and restores the reference output parameters of the proportional valve drive execution module, allowing the system to re-enter normal operation and complete a complete opening-pressure linkage correction control process.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A control system for monitoring the dual opening degree of an overflow orifice gate and for pressure-linked correction, characterized in that, It includes the gate body, hydraulic drive unit, A set of main opening encoders, B set of backup opening monitoring devices, left cylinder pressure transmitter, right cylinder pressure transmitter, PLC main control system, and proportional valve drive execution module; among which: The hydraulic drive unit includes a left opening and closing cylinder and a right opening and closing cylinder, which drive the left and right sides of the gate to rise and fall synchronously, respectively. The A set of main opening encoders and the B set of backup opening monitoring devices are respectively installed on the gate opening and closing mechanism, and are used to independently collect gate opening data and send it to the PLC main control system. The left cylinder pressure transmitter and the right cylinder pressure transmitter are respectively installed on the hydraulic lines of the left and right cylinders, and are used to collect the pressure values ​​of the left and right cylinders and send them to the PLC main control system. The PLC main control system is used to receive opening data and pressure data, calculate the opening difference ΔS and the cylinder pressure difference ΔP, and complete the operation status judgment, control loop switching and correction control based on the opening difference ΔS and the cylinder pressure difference ΔP. The proportional valve drive module adjusts the oil supply of the hydraulic drive unit according to the control signal output by the PLC main control system to realize gate correction control.

2. The system according to claim 1, characterized in that, The PLC main control system includes a dual opening data comparison module, a pressure-opening linkage discrimination module, a control loop automatic switching module, and a correction control module. The dual-aperture data comparison module is used to compare the aperture data collected by the main aperture encoder (set A) and the backup aperture monitoring device (set B) in real time. The pressure-opening degree linkage discrimination module is used to perform state discrimination by combining the opening degree difference ΔS and the cylinder pressure difference ΔP. The automatic control loop switching module is used to switch the control loop when the main opening encoder of Set A fails. The correction control module is used to execute the correction control program.

3. The system according to claim 2, characterized in that, When the system is running normally, the opening data collected by the main opening encoder of set A is used as the main control signal, and the opening data is collected synchronously by the backup opening monitoring device of set B. The PLC main control system calculates the opening difference ΔS and the cylinder pressure difference ΔP in real time. When both ΔS and ΔP are within the preset allowable range, the proportional valve drive execution module maintains the reference output state.

4. The system according to claim 2, characterized in that, When the opening difference ΔS exceeds the preset warning threshold, the PLC main control system starts the joint opening and pressure fault judgment program; When the pressure difference ΔP of the hydraulic cylinder is not greater than the allowable limit of the pressure difference, it is determined that the main opening encoder of set A has failed. The automatic control loop switching module switches the control loop to the backup opening monitoring device of set B and outputs a fault alarm signal for the main opening encoder of set A.

5. The system according to claim 4, characterized in that, When the opening difference ΔS exceeds the preset warning threshold and the cylinder pressure difference ΔP is greater than the allowable pressure difference limit, it is determined that there is actual deviation of the gate. The PLC main control system uses the opening difference ΔS as the main condition for starting the correction and the cylinder pressure difference ΔP as the auxiliary condition for correction, and starts the correction control program.

6. The system according to claim 5, characterized in that, The correction control program includes a coarse adjustment stage for opening and a fine adjustment stage for pressure. When the opening difference ΔS reaches the coarse adjustment threshold, the coarse adjustment stage begins. The PLC main control system calculates the coarse adjustment output based on the opening difference ΔS and adjusts the output of the proportional valve drive execution module to reduce the difference between the left and right openings of the gate. The coarse adjustment stage of the opening degree only uses the opening degree difference ΔS as the adjustment basis.

7. The system according to claim 6, characterized in that, When the opening difference ΔS falls back to within the fine-tuning threshold, the system switches from the coarse opening adjustment stage to the pressure fine-tuning stage. The pressure fine-tuning stage uses the cylinder pressure difference ΔP as the sole fine-tuning correction amount. The output of the actuator is adjusted by adjusting the proportional valve to balance the force on the left and right cylinders.

8. The system according to claim 7, characterized in that, The pressure fine-tuning stage includes two modes: mild overpressure fine-tuning and severe overpressure fine-tuning. When the cylinder pressure difference ΔP is within the first preset range, a slight overpressure fine-tuning mode is adopted to slightly correct the output of the proportional valve drive execution module. When the cylinder pressure difference ΔP is within the second preset range, the severe overpressure fine-tuning mode is adopted to increase the output of the proportional valve drive execution module.

9. The system according to claim 7 or 8, characterized in that, When both the opening difference ΔS and the cylinder pressure difference ΔP return to the preset acceptable range, the PLC main control system terminates the correction control program and controls the proportional valve drive execution module to return to the reference output state.

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