Hydraulic control valve speed regulation control system based on variable frequency oil pump motor and flowmeter

Abstract

The invention relates to the technical field of hydraulic control valve speed regulation, and discloses a hydraulic control valve speed regulation control system based on a variable-frequency oil pump motor and a flowmeter, which solves the problems proposed in the background art, and comprises a variable-frequency oil pump motor, the variable-frequency oil pump motor is used for dynamically regulating the rotating speed and outputting variable-flow hydraulic oil according to a control signal; the flow meter is mounted in the hydraulic pipeline and is used for detecting the flow of the hydraulic oil in real time and generating a flow feedback signal; the hydraulic control valve and the driving oil cylinder are used for receiving the hydraulic oil output by the variable frequency oil pump motor and driving the hydraulic control valve to execute opening or closing actions; the PLC control system is in signal connection with the variable-frequency oil pump motor and the flow meter, the PLC control system comprises a PID control module and an HMI, the problems that in the prior art, a hydraulic control valve is low in speed adjusting precision and low in response speed can be solved, and the effect of accurately and rapidly adjusting the speed of the hydraulic control valve is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of speed regulation of hydraulic control valves, and specifically relates to a speed regulation control system for hydraulic control valves based on a variable-frequency oil pump motor and a flow meter. Background Art

[0002] Hydraulic control valves are widely used in the fields of water conservancy, hydropower, and chemical industry. During the opening and closing processes of hydraulic control valves, in order to achieve water hammer prevention, buffering, and other requirements according to the technological process, the speed of the hydraulic cylinder of the hydraulic control valve often needs to be changed.

[0003] Currently, the speed regulation of hydraulic control valves on the market all adopts the form of throttle valves, which have the disadvantages of slow response speed, poor speed stability, limited adjustment range, and the influence of oil temperature on accuracy. In order to meet the industry's requirements for the accuracy, stability, and rapidity of the speed regulation of hydraulic control valves, although some existing adjustment methods are constantly being improved, there are still many deficiencies and it is impossible to achieve precise control of the speed of hydraulic control valves well. For this reason, we propose a speed regulation control system for hydraulic control valves based on a variable-frequency oil pump motor and a flow meter. Summary of the Invention

[0004] In order to solve the problems raised in the background art, the present invention provides the following technical solutions: A speed regulation control system for a hydraulic control valve based on a variable-frequency oil pump motor and a flow meter, including a variable-frequency oil pump motor, which is used to dynamically adjust the rotation speed according to a control signal and output hydraulic oil with variable flow rate;

[0005] A flow meter, which is installed in the hydraulic pipeline to detect the flow rate of the hydraulic oil in real time and generate a flow feedback signal;

[0006] A hydraulic control valve and a driving oil cylinder, which receive the hydraulic oil output by the variable-frequency oil pump motor and drive the hydraulic control valve to perform an opening or closing action;

[0007] A PLC control system, which is signal-connected to the variable-frequency oil pump motor and the flow meter. The PLC control system includes a PID control module and an HMI interface;

[0008] Among them, the PLC control system is configured to:

[0009] Receive the flow feedback signal of the flow meter;

[0010] Compare the flow feedback signal with a preset target flow rate value, and generate a rotation speed adjustment instruction for the variable-frequency oil pump motor through the PID algorithm;

[0011] Dynamically adjust the rotation speed of the variable-frequency oil pump motor to make the actual flow rate stable at the target flow rate value, and realize the closed-loop control of the action speed of the hydraulic control valve.

[0012] The PLC control system can receive the flow signal from the flowmeter and the flow value preset by the user, and adjust the speed of the variable-frequency oil pump motor through the PID control algorithm. This clarifies the specific functions of the PLC control system during the adjustment process, emphasizes its ability to receive and process flow signals, and the adjustment mechanism based on the PID algorithm.

[0013] Preferably, the flowmeter is a turbine flowmeter or an electromagnetic flowmeter, and the flow measurement range is 5% to 100% of the system rated flow, which helps to ensure that the flowmeter can accurately measure the flow within a wide range of the system rated flow, thus providing reliable data support for the precise control of the system.

[0014] Preferably, the HMI interface of the PLC control system supports multiple groups of flow parameter presets, real-time data display, and working condition switching functions. Operators can conveniently perform operations such as parameter presetting and system monitoring through this interface, further expanding the functions of the HMI interface. It is clear that it supports multiple groups of flow parameter presets, which enables the system to adapt to different working scenarios and process requirements; at the same time, it has a real-time data display function, facilitating operators to understand the system operation status at any time; the working condition switching function allows operators to flexibly adjust the working mode of the system according to actual needs, enhancing the flexibility and adaptability of the system.

[0015] Preferably, the proportional coefficient (Kp), integral time (Ti), and derivative time (Td) of the PID control module can be dynamically adjusted through the HMI interface according to the actual working conditions. Operators can optimize the parameters of the PID control algorithm in real time according to different working conditions and control requirements to achieve the best control effect, further improving the adaptability and control accuracy of the system.

[0016] Preferably, the speed adjustment response time of the variable-frequency oil pump motor ≤ 0.5 seconds, and the overall control accuracy of the system is ±1%, which not only quantifies the performance advantages of the system but also provides a clear basis for the design, testing, and acceptance of the system, making the technical advantages of the system more specific and measurable.

[0017] Preferably, the PLC control system also includes a fault diagnosis module, which is used to monitor flow anomalies, variable-frequency motor overload, or signal interruption in real time, and trigger alarms or shutdown protection, helping to detect and handle problems in the system operation in a timely manner and ensuring the safe and stable operation of the system.

[0018] Preferably, the system supports data interaction with the upper computer or distributed control system through industrial communication protocols, which clarifies that the system supports data interaction with the upper computer or distributed control system through industrial communication protocols. This not only improves the integration and scalability of the system but also enables the system to better integrate into the modern industrial automation environment to achieve centralized control and optimized management.

[0019] Specifically, it is manifested in the following steps:

[0020] 1: Install each component of the system, and correctly connect the variable frequency oil pump motor, flowmeter, hydraulic control valve and PLC control system;

[0021] 2: According to the actual working requirements, preset the target flow value of the hydraulic oil pipeline of the hydraulic control valve through the HMI interface of the PLC control system;

[0022] 3: Start the system, the variable frequency oil pump motor starts to work, and delivers hydraulic oil to the oil cylinder of the hydraulic control valve;

[0023] 4: The flowmeter monitors the flow of the hydraulic oil pipeline of the hydraulic control valve in real time and transmits the flow signal to the PLC control system;

[0024] 5: The PID control module of the PLC control system analyzes and processes the flow signal, and compares the actual flow with the preset flow;

[0025] 6: If there is a deviation between the actual flow and the preset flow, the PLC control system adjusts the speed of the variable frequency oil pump motor to make the hydraulic oil flow reach the preset value, so as to achieve precise adjustment of the speed of the hydraulic control valve.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] During operation, after the system is started, the operator presets the target flow values of the hydraulic oil pipeline of the hydraulic control valve through the HMI interface of the PLC control system. These preset values are set according to the actual process requirements to meet the opening and closing speed requirements of the hydraulic control valve under different working conditions. At the same time, the PLC control system conducts an initial inspection of each component to ensure that the system is in a normal working state. The variable-frequency oil pump motor starts running according to the initial control signal sent by the PLC control system, delivering hydraulic oil to the driving cylinder of the hydraulic control valve. The flowmeter is installed in the hydraulic oil pipeline, continuously monitoring the flow of the hydraulic oil, converting the flow signal into an electrical signal, and transmitting it to the PLC control system. The PLC control system receives the flow signal transmitted by the flowmeter and compares it with the preset target flow value. If there is a deviation between the actual flow and the target flow, the PID control module in the PLC control system calculates the corresponding adjustment amount according to the PID algorithm. The PID algorithm calculates the speed adjustment command of the variable-frequency oil pump motor quickly and accurately through the coordinated action of three parameters: proportional (P), integral (I), and derivative (D). The PLC control system dynamically adjusts the speed of the variable-frequency oil pump motor according to the calculated adjustment command to change the output flow of the hydraulic oil. The hydraulic oil pushes the spool of the hydraulic control valve to move through the driving cylinder, thereby realizing the opening or closing action of the hydraulic control valve. Since the speed of the variable-frequency oil pump motor is precisely adjusted, the flow of the hydraulic oil can be stabilized at the preset target flow value, thus achieving precise control of the speed of the hydraulic control valve. During the operation of the system, the flowmeter continuously monitors the actual flow of the hydraulic oil and feeds the real-time data back to the PLC control system. The PLC control system continuously adjusts the speed of the variable-frequency oil pump motor according to the real-time flow data to ensure that the hydraulic oil flow always remains near the target flow value, realizing closed-loop control. At the same time, the HMI interface of the PLC control system displays the operating state parameters of the system in real time, including the actual flow of the hydraulic oil, the speed of the variable-frequency oil pump motor, the opening and closing speed of the hydraulic control valve, etc., facilitating the operator to monitor the operation of the system. The fault diagnosis module in the PLC control system continuously monitors the operating state of the system, including abnormal flow, variable-frequency motor overload, or signal interruption. Once a fault is detected, the fault diagnosis module immediately triggers an alarm signal and takes corresponding protection measures according to the type of fault, such as shutdown protection, to prevent system damage or accidents. The system conducts data interaction with the upper computer or distributed control system through industrial communication protocols (such as industrial Ethernet or Profibus). The operator can conduct centralized control and parameter optimization adjustment of the hydraulic control valve speed regulation system through the upper computer system, realizing remote monitoring and management functions, solving the problems of low speed regulation accuracy and slow response speed in the prior art, and achieving precise and rapid adjustment of the speed of the hydraulic control valve. Description of the Drawings

[0028] The accompanying drawings are used to provide a further understanding of the present invention and form a part of the specification. They are used in conjunction with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the principle structure of the hydraulic control valve hydraulic system of the present invention;

[0030] Figure 2 It is a schematic diagram of the block diagram structure of the PLC control system of the present invention; Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Consisting of Figure 1-2 It is given that the present invention includes a variable-frequency oil pump motor, which is used to dynamically adjust the speed according to a control signal and output hydraulic oil with variable flow rate;

[0033] A flowmeter, which is installed in the hydraulic pipeline to detect the flow rate of the hydraulic oil in real time and generate a flow feedback signal;

[0034] A hydraulic control valve and a driving oil cylinder, which receive the hydraulic oil output by the variable-frequency oil pump motor and drive the hydraulic control valve to perform an opening or closing action;

[0035] A PLC control system, which is signal-connected to the variable-frequency oil pump motor and the flowmeter. The PLC control system includes a PID control module and an HMI interface;

[0036] Among them, the PLC control system is configured to:

[0037] Receive the flow feedback signal of the flowmeter;

[0038] Compare the flow feedback signal with a preset target flow value, and generate a speed adjustment instruction for the variable-frequency oil pump motor through the PID algorithm;

[0039] Dynamically adjust the speed of the variable-frequency oil pump motor to make the actual flow rate stable at the target flow value, and realize the closed-loop control of the action speed of the hydraulic control valve.

[0040] The PLC control system can receive the flow signal from the flowmeter and the preset flow value by the user, and adjust the speed of the variable-frequency oil pump motor through the PID control algorithm, which clarifies the specific functions of the PLC control system in the adjustment process, emphasizes its ability to receive and process the flow signal, and the adjustment mechanism based on the PID algorithm.

[0041] The flowmeter is a turbine flowmeter or an electromagnetic flowmeter, and the flow measurement range is 5% to 100% of the system rated flow, which helps to ensure that the flowmeter can accurately measure the flow within a wide range of the system rated flow, thus providing reliable data support for the precise control of the system.

[0042] The HMI interface of the PLC control system supports functions such as multi-group flow parameter presetting, real-time data display, and working condition switching. Operators can conveniently perform operations such as parameter presetting and system monitoring through this interface, which further expands the functions of the HMI interface. It is clear that it supports multi-group flow parameter presetting, which enables the system to adapt to different working scenarios and process requirements; at the same time, it has the function of real-time data display, which is convenient for operators to understand the system operation status at any time; the working condition switching function allows operators to flexibly adjust the working mode of the system according to actual needs, enhancing the flexibility and adaptability of the system.

[0043] The proportional coefficient (Kp), integral time (Ti), and derivative time (Td) of the PID control module can be dynamically adjusted through the HMI interface according to the actual working conditions. Operators can optimize the parameters of the PID control algorithm in real time according to different working conditions and control requirements to achieve the best control effect, further improving the adaptability and control accuracy of the system.

[0044] The speed adjustment response time of the variable-frequency oil pump motor ≤ 0.5 seconds, and the overall control accuracy of the system is ±1%, which not only quantifies the performance advantages of the system but also provides a clear basis for the design, testing, and acceptance of the system, making the technical advantages of the system more specific and measurable.

[0045] The PLC control system also includes a fault diagnosis module, which is used to monitor flow anomalies, variable-frequency motor overload, or signal interruption in real time and trigger alarms or shutdown protection, which helps to detect and handle problems in the system operation in a timely manner and ensure the safe and stable operation of the system.

[0046] The system supports data interaction with the upper computer or distributed control system through industrial communication protocols, which clarifies that the system supports data interaction with the upper computer or distributed control system through industrial communication protocols. This not only improves the integration and scalability of the system but also enables the system to better integrate into the modern industrial automation environment to achieve centralized control and optimized management.

[0047] The specific manifestations are as follows:

[0048] 1: Install each component of the system, and correctly connect the variable-frequency oil pump motor, flowmeter, hydraulic control valve and PLC control system.

[0049] 2: According to the actual working requirements, preset the target flow value of the hydraulic oil pipeline of the hydraulic control valve through the HMI interface of the PLC control system.

[0050] 3: Start the system, and the variable-frequency oil pump motor starts to work, delivering hydraulic oil to the oil cylinder of the hydraulic control valve.

[0051] 4: The flowmeter monitors the flow of the hydraulic oil pipeline of the hydraulic control valve in real time and transmits the flow signal to the PLC control system.

[0052] 5: The PID control module of the PLC control system analyzes and processes the flow signal, and compares the actual flow with the preset flow.

[0053] 6: If there is a deviation between the actual flow and the preset flow, the PLC control system adjusts the speed of the variable-frequency oil pump motor to make the hydraulic oil flow reach the preset value, so as to achieve precise adjustment of the speed of the hydraulic control valve.

[0054] Working principle: During operation, after the system is started, the operator presets the target flow values of the hydraulic oil pipeline of the hydraulic control valve through the HMI interface of the PLC control system. These preset values are set according to the actual process requirements to meet the opening and closing speed requirements of the hydraulic control valve under different working conditions. At the same time, the PLC control system conducts an initial inspection of each component to ensure that the system is in a normal working state. The variable-frequency oil pump motor starts running according to the initial control signal sent by the PLC control system, delivering hydraulic oil to the driving cylinder of the hydraulic control valve. The flowmeter is installed in the hydraulic oil pipeline to continuously monitor the flow of the hydraulic oil, convert the flow signal into an electrical signal, and transmit it to the PLC control system. The PLC control system receives the flow signal transmitted by the flowmeter and compares it with the preset target flow value. If there is a deviation between the actual flow and the target flow, the PID control module in the PLC control system calculates the corresponding adjustment amount according to the PID algorithm. The PID algorithm calculates the speed adjustment instruction of the variable-frequency oil pump motor quickly and accurately through the coordinated action of three parameters: proportional (P), integral (I), and derivative (D). The PLC control system dynamically adjusts the speed of the variable-frequency oil pump motor according to the calculated adjustment instruction to change the output flow of the hydraulic oil. The hydraulic oil pushes the spool of the hydraulic control valve to move through the driving cylinder, thereby realizing the opening or closing action of the hydraulic control valve. Since the speed of the variable-frequency oil pump motor is precisely adjusted, the flow of the hydraulic oil can be stabilized at the preset target flow value, thereby realizing the precise control of the speed of the hydraulic control valve. During the operation of the system, the flowmeter continuously monitors the actual flow of the hydraulic oil and feeds back the real-time data to the PLC control system. The PLC control system continuously adjusts the speed of the variable-frequency oil pump motor according to the real-time flow data to ensure that the hydraulic oil flow always remains near the target flow value, realizing closed-loop control. At the same time, the HMI interface of the PLC control system displays the operating state parameters of the system in real time, including the actual flow of the hydraulic oil, the speed of the variable-frequency oil pump motor, the opening and closing speed of the hydraulic control valve, etc., facilitating the operator to monitor the operation of the system. The fault diagnosis module in the PLC control system continuously monitors the operating state of the system, including abnormal flow, variable-frequency motor overload, or signal interruption, etc. Once a fault is detected, the fault diagnosis module immediately triggers an alarm signal and takes corresponding protection measures according to the type of fault, such as shutdown protection, to prevent system damage or accidents. The system conducts data interaction with the upper computer or distributed control system through industrial communication protocols (such as industrial Ethernet or Profibus). The operator can conduct centralized control and parameter optimization adjustment of the hydraulic control valve speed regulation system through the upper computer system, realizing remote monitoring and management functions, solving the problems of low speed regulation accuracy and slow response speed in the prior art, and realizing the precise and rapid regulation of the speed of the hydraulic control valve.

[0055] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0056] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid control valve speed regulation control system based on a variable frequency oil pump motor and a flow meter, characterized in that: It includes a variable-frequency oil pump motor, which is used to dynamically adjust the speed according to a control signal and output hydraulic oil with variable flow rate; A flow meter, which is installed in the hydraulic pipeline to detect the flow rate of the hydraulic oil in real time and generate a flow feedback signal; A hydraulic control valve and a driving oil cylinder, which receive the hydraulic oil output by the variable-frequency oil pump motor and drive the hydraulic control valve to perform opening or closing actions; A PLC control system, which is signal-connected to the variable-frequency oil pump motor and the flow meter. The PLC control system includes a PID control module and an HMI interface; Among them, the PLC control system is configured to: Receive the flow feedback signal of the flow meter; Compare the flow feedback signal with a preset target flow value, and generate a speed adjustment command for the variable-frequency oil pump motor through the PID algorithm; Dynamically adjust the speed of the variable-frequency oil pump motor to make the actual flow rate stable at the target flow value, and realize the closed-loop control of the action speed of the hydraulic control valve.

2. The speed regulation control system of the hydraulic control valve based on the variable frequency oil pump motor and the flow meter according to claim 1, wherein: The PLC control system can receive the flow signal of the flow meter and the flow value preset by the user, and adjust the speed of the variable-frequency oil pump motor through the PID control algorithm.

3. The liquid control valve speed regulation control system based on a variable frequency oil pump motor and a flowmeter according to claim 2, wherein: The flow meter is a turbine flow meter or an electromagnetic flow meter, and the flow measurement range is 5% to 100% of the system rated flow.

4. The liquid control valve speed regulation control system based on a variable-frequency oil pump motor and a flowmeter according to claim 3, wherein: The HMI interface of the PLC control system supports functions such as presetting multiple groups of flow parameters, real-time data display, and working condition switching.

5. The liquid control valve speed regulation control system based on a variable frequency oil pump motor and a flowmeter according to claim 4, characterized in that: The proportional coefficient (Kp), integral time (Ti), and derivative time (Td) of the PID control module can be dynamically adjusted through the HMI interface according to the actual working conditions.

6. The liquid control valve speed regulation control system based on a variable frequency oil pump motor and a flowmeter according to claim 5, characterized in that: The speed adjustment response time of the variable-frequency oil pump motor ≤ 0.5 seconds, and the overall control accuracy of the system is ±1%.

7. The liquid control valve speed regulation control system based on a variable frequency oil pump motor and a flow meter according to claim 6, characterized in that: The PLC control system also includes a fault diagnosis module, which is used to monitor flow anomalies, variable-frequency motor overload, or signal interruption in real time, and trigger alarm or shutdown protection.

8. The liquid control valve speed regulation control system based on a variable frequency oil pump motor and a flowmeter according to claim 7, characterized in that: The system supports data interaction with a host computer or a distributed control system through an industrial communication protocol.

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