High-precision synchronous digital hydraulic system

Abstract

The high-precision synchronous digital hydraulic system comprises a power source, a digital hydraulic cylinder, a balance valve, a driver, a controller, a pipeline and an oil tank, the digital hydraulic cylinder is connected with the oil tank, the balance valve and the power source through the pipeline, the driver is connected with the digital hydraulic cylinder, the controller is connected with the driver, and the controller is connected with the oil tank. The digital hydraulic cylinder comprises a motor, a digital valve and a hydraulic cylinder body, and the motor, the digital valve and the hydraulic cylinder body are mechanically connected and integrated into a whole. By the adoption of the high-precision synchronous digital hydraulic system, the hydraulic system can be simplified, the installation and debugging threshold of the system is lowered, the overall reliability of the system is improved, the synchronous movement precision of the synchronous hydraulic system can be effectively improved, and losses caused by insufficient synchronous movement precision are reduced.

Description

Technical Field

[0001] This utility model relates to the field of fluid transmission hydraulics, and in particular to a high-precision synchronous digital hydraulic system. Background Technology

[0002] The opening and closing of the cylindrical valves in hydropower stations are synchronized by a relay device mounted on the top cover. Under normal circumstances, the output force of the relay device is evenly transmitted to the top cover, ensuring that the opening and closing of the cylindrical valves are synchronized. If the synchronization accuracy of the relay device is low, it can easily cause the cylinder to jam, which not only reduces operational efficiency but also wastes a lot of manpower and resources. The design and development of a high-precision synchronization system has become a key technical issue in the control of the cylindrical valves of hydropower turbines.

[0003] Currently, two main synchronization systems are used in cylindrical valve synchronization mechanisms both domestically and internationally: one is a mechanical-hydraulic synchronization system that relies on chains to force synchronization between various actuators, and the other is an electro-hydraulic synchronization system that uses coaxial hydraulic motors. With the accelerated pace of hydropower development in China, the electro-hydraulic synchronization system is gaining increasing popularity due to its advantages. However, the electro-hydraulic synchronization systems used in existing hydropower stations still suffer from problems such as complex control, difficult installation and commissioning, high operation and maintenance costs, numerous system leaks, poor reliability, and poor synchronization accuracy.

[0004] By leveraging the advantages of digitizing the motion characteristics of digital hydraulic cylinders, not only can hydraulic systems be simplified, installation and commissioning thresholds lowered, and overall system reliability improved, but the synchronous motion accuracy of synchronous hydraulic systems can also be effectively improved, reducing losses caused by insufficient synchronous motion accuracy. Utility Model Content

[0005] The purpose of this invention is to provide a high-precision synchronous digital hydraulic system, which can not only simplify the hydraulic system, lower the installation and commissioning threshold, and improve the overall reliability of the system, but also effectively improve the synchronous motion accuracy of the synchronous hydraulic system and reduce the losses caused by insufficient synchronous motion accuracy.

[0006] To achieve the above objectives, this utility model provides a high-precision synchronous digital hydraulic system, including a power source, a digital hydraulic cylinder, a balance valve, a driver, a controller, pipelines, and an oil tank. The digital hydraulic cylinder is connected to the oil tank, the balance valve, and the power source via pipelines. The driver is connected to the digital hydraulic cylinder, and the controller is connected to the driver. The digital hydraulic cylinder includes a motor, a digital valve, and a hydraulic cylinder body, which are mechanically integrated into one unit.

[0007] Preferably, the first output port of the digital valve is connected to the hydraulic cylinder body via a pipeline, and the first output port of the digital valve is also connected to the balance valve via a pipeline.

[0008] Preferably, the second output port of the digital valve is blocked.

[0009] Preferably, the first opening of the balance valve is connected to the hydraulic cylinder body via a pipeline, and the second opening of the balance valve is connected to the power source via a pipeline.

[0010] Preferably, the oil inlet port P of the digital valve is connected to a power source via a pipeline, and the oil outlet port T of the digital valve is connected to an oil tank via a pipeline.

[0011] Preferably, the driver is connected to the motor in the digital hydraulic cylinder.

[0012] Therefore, the high-precision synchronous digital hydraulic system described above can not only simplify the hydraulic system, lower the installation and debugging threshold, and improve the overall reliability of the system, but also effectively improve the synchronous motion accuracy of the synchronous hydraulic system and reduce the losses caused by insufficient synchronous motion accuracy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a high-precision synchronous digital hydraulic system according to the present invention.

[0014] Figure Labels

[0015] 1. Digital hydraulic cylinder; 1.1 Motor; 1.2 Digital valve; 1.3 Hydraulic cylinder body; 2. Piping; 3. Oil tank; 4. Power source; 5. Balance valve; 6. Actuator; 7. Controller; Detailed Implementation

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0017] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0018] Example 1

[0019] like Figure 1As shown, this utility model provides a high-precision synchronous digital hydraulic system, including a power source 4, a digital hydraulic cylinder 1, a driver 6, a controller 7, a balance valve 5, pipelines 2, and an oil tank 3. The digital hydraulic cylinder 1 includes a motor 1.1, a digital valve 1.2, and a hydraulic cylinder body 1.3. The motor 1.1 precisely controls the opening and closing and adjustment of the digital valve 1.2, thereby achieving precise movement of the hydraulic cylinder. The digital valve 1.2 receives the drive signal from the motor 1.1 and controls the flow direction and flow rate of the hydraulic oil, thereby controlling the movement speed, direction, and stroke of the hydraulic cylinder. The hydraulic cylinder body 1.3 works closely with the digital valve 1.2 to achieve high-precision motion control. The motor 1.1, digital valve 1.2, and hydraulic cylinder body 1.3 are mechanically integrated into one unit, giving the digital hydraulic cylinder 1 higher control accuracy and response speed.

[0020] The digital hydraulic cylinder 1 is connected to the oil tank 3, balance valve 5, and power source 4 via pipe 2. The inlet port P of the digital valve 1.2 is connected to the power source 4 via pipe 2, which provides the necessary hydraulic oil to the digital hydraulic cylinder. The outlet port T of the digital valve 1.2 is connected to the oil tank 3 via pipe 2, allowing the hydraulic oil to flow back to the tank for recycling after the work is completed. The first output port of the digital valve 1.2 is connected to the hydraulic cylinder body 1.3 via pipe 2, and the digital valve 1.2 controls the movement of the hydraulic cylinder. The first output port of the digital valve 1.2 is also connected to the balance valve 5 via pipe 2. The balance valve 5 stabilizes the hydraulic system pressure and prevents hydraulic shock. The second output port of the digital valve 1.2 is blocked and not used for hydraulic oil output.

[0021] The first opening of the balance valve 5 is connected to the hydraulic cylinder body 1.3 via pipe 2, allowing the balance valve 5 to directly control the pressure of the hydraulic cylinder body 1.3, ensuring the stability and balance of the hydraulic cylinder during operation. The second opening of the balance valve 5 is connected to the power source 4 via pipe 2. Hydraulic oil supplied by the power source 4 can enter the hydraulic cylinder through the balance valve 5, which can also regulate the pressure of the power source to protect the hydraulic system and equipment. The actuator 6 is connected to the digital hydraulic cylinder 1, and the controller 7 is connected to the actuator 6. The actuator 6 is connected to the motor 1.1 in the digital hydraulic cylinder 1. The actuator 6 and the controller 7 are connected via communication, as are the actuator 6 and the motor 1.1.

[0022] Working principle: When the operator controls the controller 7 to make the digital valve 1.2 work in the upper position, the power source 4 outputs pressure oil to the oil inlet port PP of the digital valve 1.2 and the oil inlet port P of the rod chamber of the hydraulic cylinder body 1.3. The driver 6 receives the control signal from the operator and sends the corresponding number of pulses and pulse frequency to the motor 1.1 according to the set speed curve. The motor 1.1 opens the valve port of the digital valve 1.2 according to the number of pulses and pulse frequency sent, allowing the pressure oil at port P of the digital valve 1.2 to enter the rodless chamber of the hydraulic cylinder body 1.3 and the control port of the balance valve 5 through the digital valve 1.2. Driven by the pressure oil, the valve core of the balance valve 5 opens. At this time, the oil in the rod chamber of the hydraulic cylinder body 1.3 flows into port P of the digital valve 1.2, forming a differential connection.

[0023] The digital hydraulic cylinder 1, through internal closed-loop mechanical position feedback, ensures that the valve opening of the digital valve 1.2 corresponds to the flow rate required for the stroke of the digital hydraulic cylinder 1 as programmed. The stroke and speed of the digital hydraulic cylinder 1 correspond one-to-one with the number and frequency of pulses sent by the system, unaffected by external factors or load characteristics. By leveraging the digital motion characteristics of the digital hydraulic cylinder, the operator only needs to control the number and frequency of pulses input to the motor to guarantee the stroke and speed of each digital hydraulic cylinder, thereby ensuring the synchronization accuracy of the movements of each digital hydraulic cylinder.

[0024] The system controls the connection state of the working port A of the digital valve 1.2 by rotating the motor 1.1 in different directions, thereby realizing the extension and retraction of the piston rod of each digital hydraulic cylinder 1.

[0025] Therefore, the high-precision synchronous digital hydraulic system described above can not only simplify the hydraulic system, lower the installation and debugging threshold, and improve the overall reliability of the system, but also effectively improve the synchronous motion accuracy of the synchronous hydraulic system and reduce the losses caused by insufficient synchronous motion accuracy.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A high precision synchronous digital hydraulic system, characterized by, It includes a power source, a digital hydraulic cylinder, a balance valve, a driver, a controller, a pipeline and an oil tank, the digital hydraulic cylinder is connected with the oil tank, the balance valve and the power source through the pipeline, the driver is connected with the digital hydraulic cylinder, the controller is connected with the driver, the digital hydraulic cylinder includes a motor, a digital valve and a hydraulic cylinder body, and the motor, the digital valve and the hydraulic cylinder body are integrated through mechanical connection.

2. A high precision synchronous digital hydraulic system as claimed in claim 1, wherein, A first output port of the digital valve is connected with the hydraulic cylinder body through the pipeline, and the first output port of the digital valve is simultaneously connected with the balance valve through the pipeline.

3. A high precision synchronous digital hydraulic system as claimed in claim 1, wherein, A second output port of the digital valve is blocked.

4. A high precision synchronous digital hydraulic system as claimed in claim 1, wherein, A first opening of the balance valve is connected with the hydraulic cylinder body through the pipeline, and a second opening of the balance valve is connected with the power source through the pipeline.

5. A high precision synchronized digital hydraulic system as claimed in claim 1, wherein, An oil inlet port P of the digital valve is connected with the power source through the pipeline, and an oil outlet port T of the digital valve is connected with the oil tank through the pipeline.

6. A high precision synchronized digital hydraulic system as claimed in claim 1, wherein, The driver is connected with the motor in the digital hydraulic cylinder.

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