Hydraulic servo system based on energy-saving oil supply adjusting system

Abstract

The invention relates to the technical field of hydraulic servo systems, and discloses a hydraulic servo system based on an energy-saving oil supply adjusting system, which comprises a power adjusting module, a control and feedback module, an actuating mechanism module, an energy-saving auxiliary module and an integrated control module, the power adjusting module comprises a servo pump set and an energy accumulator set, the control and feedback module comprises a servo driver and a multi-sensor unit, the executing mechanism module comprises a double-outlet-rod hydraulic cylinder and a cycloid hydraulic motor, the energy-saving auxiliary module comprises a temperature management module and a three-stage filtering device, and the integrated control module is independently arranged in a control cabinet. The temperature management module comprises an oil cooler, a PTC (Positive Temperature Coefficient) heater, a temperature sensor, a plate heat exchanger, a bypass regulating valve and a PID (Proportion Integration Differentiation) temperature controller; by means of the system, temperature can be accurately controlled, energy consumption caused by oil viscosity fluctuation can be reduced, the service life of a hydraulic element is prolonged, and the energy-saving effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic servo systems, and specifically relates to a hydraulic servo system based on an energy-saving oil supply regulation system. Background Art

[0002] A hydraulic servo system is a system that precisely controls the position, speed, and force of a load by adjusting the flow rate and pressure of hydraulic components.

[0003] When the oil supply system of a traditional hydraulic servo system adjusts the flow rate through a throttle valve, a large amount of hydraulic oil flowing through the throttle orifice will cause significant pressure loss, and this part of the energy is dissipated in the form of heat, resulting in energy waste. The fixed-displacement pump continuously outputs full flow under non-full-load conditions, causing the excess flow to return through the relief valve, resulting in ineffective power consumption.

[0004] Moreover, the oil supply system of the traditional hydraulic servo system directly increases the heat generation of the system in high-temperature environments or during long-term overload operation, exceeding the heat dissipation capacity. In addition, under conditions of frequent start-stop or high-speed movement, more frictional heat is generated during the acceleration and deceleration processes of the oil. When the oil temperature rises, the viscosity of the hydraulic oil decreases significantly, and the lubrication effect weakens, resulting in increased internal friction of the hydraulic components, and further generating more heat, further exacerbating energy consumption. When the system is in a cold environment, such as in winter in the north or in an uninsulated factory building, the environmental heat is continuously dissipated, making it difficult to maintain the hydraulic oil temperature within the normal working range, especially when the ambient temperature is lower than the lower limit of the oil use temperature. When the oil temperature decreases, the viscosity of the hydraulic oil increases significantly, the flow resistance increases, and the hydraulic pump needs to overcome greater resistance to push the oil to flow, resulting in increased output power and energy consumption. The temperature and viscosity fluctuations make the system unable to operate stably, frequently adjust the oil supply pressure and flow rate, increase ineffective power consumption, and the energy-saving effect is poor. Therefore, we propose a hydraulic servo system based on an energy-saving oil supply regulation system. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydraulic servo system based on an energy-saving oil supply regulation system in order to precisely control the temperature, reduce energy consumption caused by oil viscosity fluctuations, extend the service life of hydraulic components, and improve the energy-saving effect.

[0006] The technical solution adopted by the present invention is as follows: A hydraulic servo system based on an energy-saving oil supply regulation system, the hydraulic servo system includes a power regulation module, a control and feedback module, an actuator module, an energy-saving auxiliary module, and an integrated control module; The power adjustment module includes a servo pump group and an accumulator group. The control and feedback module includes a servo driver and a multi-sensor unit. The actuator module includes a double-rod hydraulic cylinder and a cycloidal hydraulic motor. The energy-saving auxiliary module includes a temperature management module and a three-stage filtration device. The integrated control module is installed in an independent control cabinet, and the integrated control module is connected to the power adjustment module, the control and feedback module, the actuator module, and the energy-saving auxiliary module through a CAN bus; The temperature management module includes an oil chiller, a PTC heater, a temperature sensor, a plate heat exchanger, a bypass regulating valve, and a PID temperature controller.

[0007] In a preferred inventive embodiment, the servo pump group uses a variable pump driven by a servo motor, which is installed inside the hydraulic power unit and directly connected to the main oil circuit. The servo pump group is used to dynamically adjust the displacement according to the load demand, avoid overflow loss, and achieve precise matching of the oil supply and the actuator demand.

[0008] In a preferred inventive embodiment, the accumulator group is installed at the high-pressure pipeline node between the main oil circuit and the actuator. The accumulator group is used to release stored energy under low-pressure or intermittent working conditions of the system, reduce the start-stop frequency of the main pump, and recover braking energy.

[0009] In a preferred inventive embodiment, the servo driver is installed in the control cabinet and integrated with the servo motor. The servo driver realizes closed-loop control of the current loop through a DSP chip and converts the control instruction into a motor speed signal.

[0010] In a preferred inventive embodiment, the multi-sensor unit includes a pressure sensor and a displacement sensor. The multi-sensor unit is used to monitor the system pressure and the actuator displacement in real time to form the basis for closed-loop control.

[0011] In a preferred inventive embodiment, the pressure sensor is installed at key nodes of the main oil circuit, including the pump outlet and the actuator inlet. The displacement sensor is installed on the hydraulic cylinder piston rod or the motor output shaft.

[0012] In a preferred inventive embodiment, the stroke accuracy of the double-rod hydraulic cylinder is ±0.02 mm, and the rotational speed error of the cycloidal hydraulic motor is ≤1 rpm.

[0013] In a preferred inventive embodiment, the oil chiller consists of a compressor, a condenser, and an evaporator, and controls the oil temperature in the range of 35-55 °C through forced heat exchange to avoid the decrease in oil viscosity and the aging of seals caused by high temperature.

[0014] In a preferred embodiment of the invention, the PTC heater is horizontally installed on the side plate or bottom of the fuel tank to ensure that the heater is completely immersed in the hydraulic oil and is below the lowest liquid level. The PTC heater adopts a positive temperature coefficient ceramic resistor structure, which can quickly heat the oil to the working temperature during low-temperature startup, shortening the system preheating time.

[0015] In a preferred embodiment of the invention, the three-stage filtration device includes an oil suction filter installed in the pump inlet pipeline, a high-pressure filter installed in front of the servo valve, and a return oil filter installed at the fuel tank inlet.

[0016] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. In the present invention, when the hydraulic servo system supplies oil under high-temperature conditions and the oil temperature exceeds the threshold, the oil cooler starts forced cooling, and the bypass valve increases the heat exchange flow. When encountering low-temperature conditions, the heater starts, reducing the cooling power and increasing the heating efficiency, and using the PID temperature controller to dynamically match the cooling / heating power, so that the oil viscosity is stabilized in the optimal range of 15-46 cSt, accurately controlling the temperature to reduce the energy consumption caused by oil viscosity fluctuations, extending the life of hydraulic components, and improving the energy-saving effect.

[0017] 2. In the present invention, a variable pump driven by a servo motor is adopted to adjust the displacement in real time according to the load demand, avoiding the overflow loss of the traditional fixed-displacement pump, reducing the ineffective oil supply. At the same time, an accumulator is set at the high-pressure pipeline node to recover braking energy during intermittent working conditions and release the stored energy, reducing the start-stop frequency of the main pump and improving the energy-saving effect.

[0018] 3. In the present invention, the integrated control module centrally regulates the power, execution, and energy-saving auxiliary modules through the CAN bus to achieve global optimization of the oil supply pressure, flow rate, and temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the hydraulic servo system in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention fall within the protection scope of the present invention.

[0021] The following will combine Figure 1 to describe in detail a hydraulic servo system of an energy-saving oil supply regulation system according to an embodiment of the present invention. Embodiment

[0022] Reference Figure 1 , a hydraulic servo system based on an energy-saving fuel supply regulation system, the hydraulic servo system includes a power regulation module, a control and feedback module, an actuator module, an energy-saving auxiliary module and an integrated control module; the power regulation module includes a servo pump group and an accumulator group, the servo pump group adopts a variable pump driven by a servo motor, is installed inside the hydraulic power unit, is directly connected to the main oil circuit, and the servo pump group is used to dynamically adjust the displacement according to the load demand, avoid overflow loss, and achieve precise matching of the fuel supply amount and the actuator demand; specifically, a variable pump driven by a servo motor is used to adjust the displacement in real time according to the load demand, avoid the overflow loss of the traditional fixed-displacement pump, and reduce the ineffective fuel supply.

[0023] Reference Figure 1 , the accumulator group is installed at the high-pressure pipeline node between the main oil circuit and the actuator, and the accumulator group is used to release energy storage under low-pressure or intermittent working conditions of the system, reduce the start-stop frequency of the main pump, and recover braking energy; specifically, an accumulator is set at the high-pressure pipeline node, and the braking energy is recovered and the energy storage is released by using the intermittent working condition, reduce the start-stop frequency of the main pump, and improve the energy-saving effect.

[0024] Reference Figure 1 , the control and feedback module includes a servo driver and a multi-sensor unit, the multi-sensor unit includes a pressure sensor and a displacement sensor, the multi-sensor unit is used to monitor the system pressure and the actuator displacement in real time, form the basis of closed-loop control, the pressure sensor is installed at the key nodes of the main oil circuit, including the pump outlet and the actuator inlet, and the displacement sensor is installed on the piston rod of the hydraulic cylinder or the output shaft of the motor; the actuator module includes a double-rod hydraulic cylinder and a cycloidal hydraulic motor, the stroke accuracy of the double-rod hydraulic cylinder is ±0.02mm, the rotational speed error of the cycloidal hydraulic motor is ≤1rpm, the integrated control module is in an independent control cabinet, and the integrated control module is connected to the power regulation module, the control and feedback module, the actuator module and the energy-saving auxiliary module through the CAN bus; specifically, through the coordinated work of the servo driver and the multi-sensor unit, the hydraulic servo system realizes high-precision closed-loop control, energy-saving optimization, stability improvement and fast response, and uses the integrated control module to centrally control the power, actuator and energy-saving auxiliary modules through the CAN bus to realize the global optimization of the fuel supply pressure, flow rate and temperature.

[0025] Reference Figure 1, the energy-saving auxiliary module includes a temperature management module and a three-stage filtration device. The temperature management module includes an oil cooler, a PTC heater, a temperature sensor, a plate heat exchanger, a bypass regulating valve, and a PID temperature controller. The oil cooler consists of a compressor, a condenser, and an evaporator, and controls the oil temperature in the range of 35 - 55°C through forced heat exchange to avoid the decrease in oil viscosity and the aging of seals caused by high temperature. The PTC heater is horizontally installed on the side plate or bottom of the fuel tank to ensure that the heater is completely immersed in the hydraulic oil and is below the lowest liquid level. Moreover, the PTC heater adopts a positive temperature coefficient ceramic resistor structure, which can quickly heat the oil to the working temperature during low-temperature startup, shortening the system preheating time. Specifically, it is a platinum resistance (PT100) or a thermocouple probe, which is arranged at positions such as the fuel tank and the oil return pipeline to monitor the oil temperature in real time and feedback it to the control system. It is composed of stacked stainless steel corrugated plates, connecting the oil cooler and the fuel tank to achieve efficient heat exchange between the oil and the cooling medium. When the hydraulic servo system encounters a high-temperature working condition and the oil temperature exceeds the threshold, the oil cooler starts forced cooling, and the bypass valve increases the heat exchange flow. While in a low-temperature working condition, the heater starts, reducing the cooling power and increasing the heating efficiency, and using the PID temperature controller to dynamically match the cooling / heating power, so that the oil viscosity is stabilized in the optimal range of 15 - 46 cSt, accurately controlling the temperature to reduce the energy consumption caused by the fluctuation of oil viscosity and extending the life of hydraulic components, improving the energy-saving effect.

[0026] Referring to Figure 1 , the three-stage filtration device includes a suction filter installed on the pump inlet pipeline, a high-pressure filter installed in front of the servo valve, and a return filter installed at the fuel tank inlet. Specifically, all three filters use high-precision filter elements (1μm level) with β≥200 to reduce the wear of valve parts caused by oil contamination and extend the system life.

[0027] It should be noted that in this article, 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 term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including 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. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic servo system based on an energy-saving fuel supply regulation system, characterized in that: The hydraulic servo system includes a power regulation module, a control and feedback module, an actuator module, an energy-saving auxiliary module, and an integrated control module; The power regulation module includes a servo pump group and an accumulator group. The control and feedback module includes a servo driver and a multi-sensor unit. The actuator module includes a double-rod hydraulic cylinder and a cycloidal hydraulic motor. The energy-saving auxiliary module includes a temperature management module and a three-stage filtering device. The integrated control module is installed in an independent control cabinet, and the integrated control module is connected to the power regulation module, the control and feedback module, the actuator module, and the energy-saving auxiliary module through a CAN bus; The temperature management module includes an oil cooler, a PTC heater, a temperature sensor, a plate heat exchanger, a bypass regulating valve, and a PID temperature controller.

2. The hydraulic servo system based on an energy-saving fuel supply regulation system according to claim 1, wherein: The servo pump group uses a variable pump driven by a servo motor, which is installed inside the hydraulic power unit and directly connected to the main oil circuit. The servo pump group is used to dynamically adjust the displacement according to the load demand, avoid overflow loss, and achieve precise matching of the oil supply and the actuator demand.

3. A hydraulic servo system based on an energy-saving fuel supply regulation system according to claim 1, characterized in that: The accumulator group is installed at the high-pressure pipeline node between the main oil circuit and the actuator. The accumulator group is used to release stored energy under low-pressure or intermittent working conditions of the system, reduce the start-stop frequency of the main pump, and recover braking energy.

4. A hydraulic servo system based on an energy-saving fuel supply regulation system as claimed in claim 1, wherein: The servo driver is installed in the control cabinet and integrated with the servo motor. The servo driver realizes closed-loop control of the current loop through a DSP chip and converts the control instruction into a motor speed signal.

5. The hydraulic servo system based on an energy-saving fuel supply regulation system according to claim 1, characterized in that: The multi-sensor unit includes a pressure sensor and a displacement sensor. The multi-sensor unit is used to monitor the system pressure and the actuator displacement in real time to form the basis of closed-loop control.

6. The hydraulic servo system based on the energy-saving fuel supply regulation system according to claim 5, characterized in that: The pressure sensor is installed at key nodes of the main oil circuit, including the pump outlet and the actuator inlet. The displacement sensor is installed on the hydraulic cylinder piston rod or the motor output shaft.

7. A hydraulic servo system based on an energy-saving fuel supply regulation system according to claim 1, characterized in that: The stroke accuracy of the double-rod hydraulic cylinder is ±0.02 mm, and the rotational speed error of the cycloidal hydraulic motor is ≤1 rpm.

8. The hydraulic servo system based on an energy-saving fuel supply adjustment system according to claim 1, wherein: The oil cooler consists of a compressor, a condenser, and an evaporator, and controls the oil temperature in the range of 35-55 °C through forced heat exchange to avoid the decrease of oil viscosity and the aging of seals caused by high temperature.

9. The hydraulic servo system based on an energy-saving fuel supply adjustment system according to claim 1, characterized in that: The PTC heater is horizontally installed on the side plate or bottom of the fuel tank to ensure that the heater is completely immersed in the hydraulic oil and is below the lowest liquid level. The PTC heater adopts a positive temperature coefficient ceramic resistance structure and quickly heats the oil to the working temperature during low-temperature startup, shortening the system preheating time.

10. A hydraulic servo system based on an energy-saving fuel supply adjustment system according to claim 1, characterized in that: The three-stage filtering device includes a suction filter installed on the pump inlet pipeline, a high-pressure filter installed in front of the servo valve, and a return filter installed at the fuel tank inlet.

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