Heavy hydraulic machine proportional servo flexible energy-saving control hydraulic system

Abstract

The utility model discloses a kind of heavy hydraulic machine proportional servo flexible energy-saving control hydraulic systems, belong to heavy hydraulic machine technical field, this kind of heavy hydraulic machine proportional servo flexible energy-saving control hydraulic system, including oil cylinder, oil cylinder includes oil cylinder control valve group unit, pipeline pressure relief valve group unit and return control valve group unit, oil cylinder control valve group unit, pipeline pressure relief valve group unit and return control valve group unit inside are provided with proportional cartridge valve;Oil cylinder further includes main pump group control unit and pilot control unit, displacement sensor is respectively arranged in main pump group control unit and pilot control unit, and oil cylinder control valve group unit and pilot control unit are electrically connected with pipeline pressure relief valve group unit and return control valve group unit respectively, oil cylinder control valve group unit and pilot control unit are electrically connected with pipeline pressure relief valve group unit and return control valve group unit respectively by control circuit, to realize collaborative control.

Description

Technical Field

[0001] This utility model relates to the field of heavy-duty hydraulic presses, and more specifically, to a proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses. Background Technology

[0002] With the rapid development of hydraulic press technology, heavy and super-heavy hydraulic presses have a wide range of applications and market prospects in core manufacturing fields such as large aircraft, nuclear power and wind power. The requirements for precise control of the process parameters of the equipment are becoming increasingly stringent. At the same time, with the further advancement of carbon neutrality policies, the development of digital technology and the widespread application of automation technology.

[0003] Traditional heavy-duty hydraulic press systems mostly use ordinary on / off valves during operation. These valves are insufficient for precise pressure and flow regulation, resulting in low pressing accuracy and failing to meet precision machining requirements. In some metal forming processes, inaccurate pressure control can easily cause workpiece dimensional deviations. Furthermore, if the motor continues to run during non-operational periods, significant electrical energy is wasted. Moreover, shocks and vibrations are easily generated during slide speed switching and pressure relief, affecting equipment lifespan and reducing processing quality. Therefore, inventing a proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses to address these problems has become a pressing issue for those skilled in the art. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses. It aims to improve the problems of inaccurate pressure control and the tendency to generate impacts and vibrations during slider speed switching and pressure relief processes in traditional heavy-duty hydraulic press systems, which affect the lifespan of the equipment.

[0005] This utility model is implemented as follows: a proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses, comprising...

[0006] The hydraulic cylinder includes a hydraulic cylinder control valve assembly unit, a pipeline pressure relief valve assembly unit, and a return control valve assembly unit. Each of these units is equipped with a proportional cartridge valve. The hydraulic cylinder also includes a main pump assembly control unit and a pilot control unit. Each of these units is equipped with a displacement sensor, and the hydraulic cylinder control valve assembly unit and the pilot control unit are electrically connected to the pipeline pressure relief valve assembly unit and the return control valve assembly unit, respectively.

[0007] In a preferred embodiment of this utility model, the proportional cartridge valves inside the cylinder control valve group unit are connected to the main cylinder oil inlet and the main cylinder pressure relief outlet, respectively.

[0008] In a preferred embodiment of this utility model, the cylinder control valve group unit is further provided with a proportional pressure regulating valve, which is connected to the main cylinder.

[0009] In a preferred embodiment of this utility model, the proportional cartridge valve installed in the pipeline pressure relief valve assembly unit is connected to the pressure relief point of the high-pressure pipeline.

[0010] In a preferred embodiment of this utility model, a pressure sensor is further provided in the cylinder control valve group unit, and the pressure sensor is electrically connected to the pilot control unit.

[0011] In a preferred embodiment of this utility model, the return control valve group unit is further provided with a supporting ball valve surrounding a balanced support cartridge valve.

[0012] In a preferred embodiment of this utility model, the proportional cartridge valves in the return control valve group unit are respectively arranged to connect the oil inlet and oil outlet chambers of the master cylinder at the return point.

[0013] In a preferred embodiment of this utility model, a pressure sensor is further provided in the return control valve unit, and the pressure sensor is electrically connected to the pilot control unit.

[0014] In a preferred embodiment of this utility model, the displacement sensor installed in the pilot control unit is electrically connected to the hydraulic cylinder control valve group unit and the hydraulic cylinder, respectively.

[0015] In a preferred embodiment of this utility model, the pressure sensor installed in the pilot control unit is electrically connected to the proportional cartridge valve of the hydraulic cylinder control valve group unit.

[0016] The beneficial effects of this utility model are as follows: The heavy-duty hydraulic press proportional servo flexible energy-saving control hydraulic system obtained by the above design has significant energy-saving effects during use: the main pump group control unit adopts a method of directly connecting a proportional high-pressure plunger pump and a servo motor, which can accurately output the main pump flow according to the changes in press load, and achieve zero speed in non-working state, greatly reducing energy consumption. Actual testing shows that it is more energy-efficient than traditional hydraulic systems.

[0017] High pressing precision: The programmable logic controller (PLC) enables precise control of the proportional cartridge valve and the proportional pressure regulating valve, achieving accurate adjustment of pressure and flow. The pressure control precision is controllable, improving the pressing precision and meeting the needs of precision machining.

[0018] Smooth operation: The proportional cartridge relief valve of the hydraulic cylinder control valve group unit adopts an independent oil circuit design, which effectively eliminates the impact caused by the deformation of the press body and hydraulic oil stiffness; the double support valve of the return control valve group unit is a balanced support cartridge valve, which provides mechanical support and safety protection, making the system run more smoothly and reducing the vibration amplitude of the equipment.

[0019] Fast response speed: The accumulator of the pilot control unit is set in parallel with the servo pump group to stabilize the pilot oil circuit pressure and compensate for instantaneous flow demand, thereby shortening the system response time and improving the system response speed.

[0020] High degree of integration: The components are rationally arranged and have a compact structure, which reduces the space occupied. Compared with traditional systems, the size is smaller and easier to maintain and manage. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram provided by an embodiment of the present utility model;

[0023] Figure 2 A partial circuit block diagram of the present invention is provided for the embodiments of this utility model.

[0024] Figure 3 A schematic diagram of the structure of the hydraulic cylinder control valve assembly unit and the pipeline pressure relief valve assembly unit provided for embodiments of this utility model;

[0025] Figure 4 A side view of the circuit block diagram provided for an embodiment of this utility model.

[0026] In the diagram: 01, hydraulic cylinder; 02, hydraulic cylinder control valve assembly unit; 03, pipeline pressure relief valve assembly unit; 04, return control valve assembly unit; 05, main pump assembly control unit; 06, pilot control unit; 07, proportional cartridge valve; 08, pressure sensor; 09, displacement sensor. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] Please see Figures 1 to 4 This utility model provides a technical solution: a proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses, comprising...

[0029] The hydraulic cylinder 01 includes a hydraulic cylinder control valve assembly unit 02, a pipeline pressure relief valve assembly unit 03, and a return control valve assembly unit 04. Each of these units is equipped with a proportional cartridge valve 07. The hydraulic cylinder 01 also includes a main pump assembly control unit 05 and a pilot control unit 06. Displacement sensors 09 are installed in both the main pump assembly control unit 05 and the pilot control unit 06. The hydraulic cylinder control valve assembly unit 02 and the pilot control unit 06 are electrically connected to the pipeline pressure relief valve assembly unit 03 and the return control valve assembly unit 04, respectively. The hydraulic cylinder control valve assembly unit 02 and the pilot control unit 06 are electrically connected to the pipeline pressure relief valve assembly unit 03 and the return control valve assembly unit 04 via control lines to achieve coordinated control.

[0030] The main pump unit control unit 05 adopts a direct connection between a proportional high-pressure plunger pump and a servo motor, accurately outputting the main pump flow rate according to changes in the press load, achieving zero speed in non-working states, and significantly reducing energy consumption. Actual testing shows that it is more energy-efficient than traditional hydraulic systems. Meanwhile, the pressure sensor 08 within the pilot control unit 06 is connected to the accumulator oil circuit to monitor technical characteristics such as the accumulator's working pressure. The pressure sensor 08 and the accumulator work together to control components such as the proportional cartridge valve 07 and the servo pump unit, achieving precise control and energy-saving operation of the hydraulic system.

[0031] Hydraulic cylinder control valve group unit 02: It consists of a proportional cartridge oil inlet speed regulating valve, a proportional pressure regulating valve, a proportional cartridge pressure relief valve, etc., which can accurately realize the functions of main cylinder speed regulation, proportional pressure regulation, and flexible pressure relief.

[0032] Return control valve unit 04: It consists of a proportional cartridge oil inlet valve, a proportional cartridge oil outlet valve, and a double support valve, which can accurately realize flexible switching of fast / slow down speed, precise speed regulation of return, and safety protection functions.

[0033] High-pressure pipeline pressure relief valve assembly unit 03: The pipeline adopts a separate proportional pressure relief cartridge valve assembly to achieve pressure relief of the high-pressure pipeline;

[0034] Pilot control unit 06: Composed of servo pump set, control valve and accumulator, used for pilot oil circuit control of proportional cartridge valve 07, etc.

[0035] Pressure sensor 08: Used to collect data such as pump head pressure, master cylinder pressure, return force, and control system pressure;

[0036] Displacement sensor 09: Used to collect slider position data;

[0037] It is also equipped with a programmable logic controller (PLC). The PLC is used to read the slider position data and calculate the slider's real-time speed and pressure, control the output servo motor speed and quantity, the main pump deflection angle, the oil discharge flow rate of the proportional insert, and control the oil supply flow rate of the proportional servo valve. It is used to realize real-time detection and feedback of workpiece load, and adjust the matching of system parameters according to the feedback to achieve precise, flexible and energy-saving control.

[0038] The proportional cartridge valves 07 inside the cylinder control valve assembly unit 02 are connected to the main cylinder inlet and the main cylinder pressure relief point, respectively. The proportional cartridge valves 07 include an inlet speed control valve and a pressure relief valve. The inlet speed control valve is connected to the main cylinder inlet, and the pressure relief valve is connected to the main cylinder pressure relief point, respectively controlling the main cylinder's inlet flow and pressure relief process. The cylinder control valve assembly unit 02 also contains a proportional pressure regulating valve, which is connected to the main cylinder and used to precisely adjust the main cylinder pressure according to the control signal. The proportional cartridge valve 07 inside the pipeline pressure relief valve assembly unit 03 is connected to the high-pressure pipeline pressure relief point. The opening degree of the proportional cartridge valve 07 is proportional to the pipeline pressure to achieve flexible pressure relief in the high-pressure pipeline.

[0039] The hydraulic cylinder control valve assembly unit 02 also includes a pressure sensor 08, which is electrically connected to the pilot control unit 06 to monitor the master cylinder pressure in real time and provide feedback to the control system. The return stroke control valve assembly unit 04 includes a support ball valve surrounding a balance support cartridge valve. The support ball valve provides auxiliary support force during the slide return stroke to ensure smooth movement. The proportional cartridge valves 07 within the return stroke control valve assembly unit 04 are respectively located in the inlet and outlet chambers of the master cylinder at the return stroke, and the drain valve is connected to the outlet chamber of the master cylinder, used to control the speed and direction of the slide return stroke.

[0040] The return control valve unit 04 is also equipped with a pressure sensor 08, which is electrically connected to the pilot control unit 06 to monitor pressure changes during the return process and provide feedback control.

[0041] The displacement sensor 09 installed in the pilot control unit 06 is electrically connected to the hydraulic cylinder control valve group unit 02 and the hydraulic cylinder 01 respectively. The displacement sensor 09 is electrically connected to the control module of the hydraulic cylinder control valve group unit 02 and the displacement detection interface of the hydraulic cylinder 01 respectively through the signal line, and is used to provide real-time feedback of slider position information to realize closed-loop control.

[0042] The pressure sensor 08 installed in the pilot control unit 06 is electrically connected to the proportional cartridge valve 07 of the cylinder control valve group unit 02. The pressure sensor 08 is electrically connected to the control terminal of the proportional cartridge valve 07 of the cylinder control valve group unit 02 through a signal line, and is used to dynamically adjust the opening degree of the proportional cartridge valve 07 according to the system pressure change.

[0043] Working principle: When the heavy-duty hydraulic press starts working, the proportional high-pressure piston pump of the main pump group control unit 05, driven by the servo motor, outputs hydraulic oil. The hydraulic oil is delivered to the cylinder 01 through pipelines, providing power for the movement of the cylinder 01.

[0044] During the pressing process, the programmable logic controller (PLC) calculates the real-time speed and pressure based on the preset program and the slider position data collected by the displacement sensor 09. It then controls the opening and closing of the proportional cartridge valve 07 and the proportional pressure regulating valve to precisely adjust the flow and pressure of the hydraulic oil entering the cylinder 01, achieving precise control of the pressing process.

[0045] When pressure relief is required, the proportional cartridge pressure relief valve of cylinder control valve assembly unit 02 opens to achieve flexible pressure relief of the main cylinder and eliminate impact. The proportional cartridge valve 07 of pipeline pressure relief valve assembly unit 03 is connected to the high-pressure pipeline pressure relief point to relieve pressure on the high-pressure pipeline.

[0046] During the slide block's return stroke, the proportional cartridge valve 07 of the return stroke control valve group unit 04 controls the flow of hydraulic oil to achieve precise slide block return. Simultaneously, the dual-support valve, a balanced support cartridge valve, provides mechanical support and safety protection during the slide block's return stroke.

[0047] Pressure sensor 08 collects real-time data on pump head pressure, cylinder 01 pressure, return force, and control system pressure, and transmits this data to the programmable logic controller (PLC). The PLC then adjusts the system in real-time based on this data to ensure stable and efficient operation under various working conditions.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A proportional servo flexible energy-saving control hydraulic system for a heavy-duty hydraulic press, characterized in that, include The hydraulic cylinder includes a hydraulic cylinder control valve assembly unit, a pipeline pressure relief valve assembly unit, and a return control valve assembly unit. Each of the hydraulic cylinder control valve assembly unit, the pipeline pressure relief valve assembly unit, and the return control valve assembly unit is equipped with a proportional cartridge valve. The hydraulic cylinder also includes a main pump control unit and a pilot control unit. Displacement sensors are respectively installed in the main pump control unit and the pilot control unit, and the hydraulic cylinder control valve group unit and the pilot control unit are electrically connected to the pipeline pressure relief valve group unit and the return control valve group unit, respectively.

2. The heavy-duty hydraulic press proportional servo flexible energy-saving control hydraulic system as described in claim 1, characterized in that: The proportional cartridge valves inside the hydraulic cylinder control valve group unit are connected to the main cylinder oil inlet and the main cylinder pressure relief outlet, respectively.

3. The proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses as described in claim 1, characterized in that: The cylinder control valve group unit is also equipped with a proportional pressure regulating valve, which is connected to the main cylinder.

4. The proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses as described in claim 1, characterized in that: The proportional cartridge valve installed in the pipeline pressure relief valve assembly unit is connected to the pressure relief point of the high-pressure pipeline.

5. The proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses as described in claim 1, characterized in that: The hydraulic cylinder control valve group unit is also equipped with a pressure sensor, which is electrically connected to the pilot control unit.

6. The proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses as described in claim 1, characterized in that: The return control valve unit is also equipped with a supporting ball valve surrounding a balanced support cartridge valve.

7. The proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses as described in claim 1, characterized in that: The proportional cartridge valves in the return control valve group unit are respectively set in the oil inlet and oil outlet chambers of the master cylinder at the return point and are connected.

8. The proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses as described in claim 1, characterized in that: The return control valve unit is also equipped with a pressure sensor, which is electrically connected to the pilot control unit.

9. The proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses as described in claim 1, characterized in that: The displacement sensors installed in the pilot control unit are electrically connected to the hydraulic cylinder control valve group unit and the hydraulic cylinder, respectively.

10. The proportional servo flexible energy-saving control hydraulic system for heavy-duty hydraulic presses as described in claim 1, characterized in that: The pressure sensor installed in the pilot control unit is electrically connected to the proportional cartridge valve of the cylinder control valve group unit.

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