Highly integrated and intelligent electro-hydraulic rotary direct drive system and arrangement method thereof

Abstract

The application discloses a high-integration high-heat-dissipation intelligent electro-hydraulic rotary direct drive system and a distribution method thereof. The hydraulic system mainly comprises a main oil circuit, an oil supplementing circuit, a heat dissipation circuit and a sensor circuit. The main oil circuit comprises a servo motor, a closed plunger pump, a two-point reversing module and a low-speed large-torque hydraulic motor. The oil supplementing circuit comprises an open oil supplementing pump, an oil tank, a filter, a safety valve group and a low-pressure overflow valve. The heat dissipation circuit comprises a flushing valve, an air cooling module and the oil tank. The sensor circuit comprises two pressure sensors and two flow meters for monitoring the inlet and outlet of the hydraulic motor. In the application, the heat dissipation circuit draws a part of hot oil from the low-pressure pipeline of the main oil circuit through the flushing valve, cools the hot oil through the air cooling module and returns the hot oil to the oil tank. In addition to the design of the hydraulic circuit, the application also provides a three-dimensional compact distribution method of elements, so that the hydraulic elements are integrated internally, the system is completely externally driven, the system profile volume is further reduced and the torque density is increased.

Description

Technical Field

[0001] This invention belongs to the field of high-performance electro-hydraulic system design and structural optimization, and specifically relates to a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system and its arrangement method. Background Technology

[0002] Due to their advantages such as high torque density, energy saving, and good low-speed stability, low-speed, high-torque electro-hydraulic rotary systems are widely used in low-speed and heavy-duty industrial scenarios, such as towed anti-submarine drive systems and wind turbine pitch control systems. With the development trends of hydraulic energy saving, electrification, and intelligence, low-speed, high-torque electro-hydraulic rotary systems need further improvement in overall performance, leading to the emergence of the direct-drive system concept. This concept aims to minimize intermediate transmission links, such as replacing valve control with pump control and replacing high-speed motors and reducer combinations with low-speed, high-torque hydraulic motors. On the other hand, while simplifying system components, the development of high-performance engineering machinery presents the challenge of achieving higher torque density in a smaller space, further demanding higher integration and smaller size from electro-hydraulic rotary systems. However, high integration easily leads to heat accumulation, and poor heat dissipation can cause the hydraulic fluid and motor to overheat, potentially leading to system failure. Therefore, high integration and heat dissipation difficulties have become the main challenges in the design of high-performance electro-hydraulic rotary direct-drive systems.

[0003] To address this, this invention proposes a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct-drive system and its arrangement method. On one hand, the direct-drive design avoids redundancy in hydraulic system components, thus ensuring a minimum system volume. On the other hand, the designed high-heat-dissipation cooling circuit increases the heat dissipation capacity of the closed system, preventing excessive temperature rise. Furthermore, a three-dimensional arrangement method for system components is provided, minimizing the system's overall volume and pipeline length. Moreover, the design concept of this invention abandons the traditional long hydraulic pipeline design, integrating the complex hydraulic circuit inside the housing, allowing for plug-and-play operation upon power connection, greatly facilitating use in industrial settings. Summary of the Invention

[0004] This invention addresses the challenges of integration and heat dissipation in current electro-hydraulic rotary direct drive system designs by proposing a highly integrated, heat-dissipating, and intelligent electro-hydraulic rotary direct drive system and its layout method. The designed system simplifies component composition and incorporates a powerful cooling circuit, ensuring adequate heat dissipation. Furthermore, the proposed three-dimensional layout method minimizes the system's overall volume and piping length, providing an effective solution for the integrated design of electro-hydraulic systems.

[0005] The objective of this invention is achieved through the following technical solution: a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system, which mainly consists of a main oil circuit, an oil replenishment circuit, a heat dissipation circuit, and a sensor circuit;

[0006] The main oil circuit controls the swashplate tilt direction of the closed plunger pump based on a two-point reversing module to realize the oil reversal of the main oil circuit; the closed plunger pump and the open replenishing pump of the replenishing circuit are rigidly connected by shafts and driven coaxially by the servo motor of the main oil circuit.

[0007] The heat dissipation circuit includes a flushing valve and an air-cooling module; the two damping holes of the flushing valve are connected in parallel to the inlet and outlet ports of the hydraulic motor in the main oil circuit, and the flushing port is connected to the leakage port of the hydraulic motor; the flushing valve changes the discharge direction through the damping holes, and discharges the hot oil in the low-pressure pipeline in the main oil circuit through the flushing holes. The flushing flow and the leakage flow of the hydraulic motor are combined and cooled by the air-cooling module before flowing back to the oil tank.

[0008] The sensor circuit includes a pressure sensor and a flow meter, which are located between the closed-loop piston pump and the hydraulic motor, and connected in series in the high-pressure pipeline and the low-pressure pipeline, respectively, for intelligent monitoring and real-time control.

[0009] Furthermore, the main oil circuit includes a low-speed, high-torque hydraulic motor; oil is directly supplied to the low-speed, high-torque hydraulic motor via a closed-loop piston pump, forming a pump-controlled direct-drive circuit.

[0010] Furthermore, the oil replenishment circuit includes a safety valve group consisting of two sets of symmetrically arranged check valves and high-pressure relief valves connected in parallel, as well as a low-pressure relief valve; the open-type oil replenishment pump draws oil from the oil tank and replenishes the low-pressure circuit of the main oil circuit through a filter, and the low-pressure relief valve is adjusted to maintain the oil replenishment pressure; the safety valve group cuts off the high-pressure oil circuit when the main oil circuit is over-pressured, in order to protect the hydraulic components of the main oil circuit.

[0011] Furthermore, the flushing flow rate of the flushing valve is adjusted by the size of the damping orifice.

[0012] Furthermore, the replenishment flow rate of the replenishment circuit is equal to the sum of the internal leakage flow rate of the closed piston pump, the external leakage flow rate of the hydraulic motor, and the flushing flow rate of the flushing valve.

[0013] Furthermore, the sensing circuit includes a first pressure sensor, a second pressure sensor, a first flow meter, and a second flow meter; the first pressure sensor and the second pressure sensor are respectively placed between the closed-loop piston pump and the hydraulic motor in the main oil circuit, and are connected in series in the high-pressure pipeline and the low-pressure pipeline, respectively; the first flow meter and the second flow meter are arranged in the same way as the pressure sensor, but are closer to the hydraulic motor, and are used to monitor the pressure and flow feedback of the electro-hydraulic rotary direct drive system in real time.

[0014] On the other hand, the present invention also provides a method for arranging a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system, the method being as follows:

[0015] The electro-hydraulic rotary direct drive system is assembled and fixed through a regular hexahedral shell, and the hydraulic components are integrated inside the shell to achieve complete external electric drive; the arrangement method is divided into two steps, external arrangement and internal arrangement, depending on whether it is fixed to the shell.

[0016] External arrangement: The components of the electro-hydraulic rotary direct drive system are fixed on the three inner sides of the housing. The servo motor and air-cooled module, which require external power and cooling, are arranged on the outer side of the housing. At the same time, the low-speed, high-torque hydraulic motor requires an external output shaft and is fixed on the inner side of the housing. The oil tank is responsible for supplying oil to the system and is fixed on the inner side of the top surface of the housing, with an opening on the top surface for oil replenishment.

[0017] Internal Layout: Except for the components in the external layout of the electro-hydraulic rotary direct drive system, all other components are not fixed to the housing and are arranged inside the housing; the two-point reversing module is fixed inside the closed-loop piston pump; the closed-loop piston pump and the open-loop replenishing pump are coaxially connected to the servo motor through a coupling; the flushing valve is directly fixed to the closed-loop piston pump; at the same time, two pressure sensors are directly fixed to the two pressure test joints of the closed-loop piston pump; the two flow meters are directly connected to the low-speed, high-torque hydraulic motor through a valve block.

[0018] Furthermore, hydraulic hoses are used for all pipeline connections between hydraulic components, and the connection method and sequence are the same as those for the main oil circuit and the replenishment oil circuit.

[0019] The beneficial effects of this invention are:

[0020] This invention provides a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system and its layout method. The hydraulic system designed with this layout features high torque density, small profile volume, low temperature rise, and intelligence, making it suitable for low-speed, high-torque drive scenarios in confined spaces. The design concept of this invention abandons the traditional long hydraulic pipeline design, integrating the complex hydraulic circuit inside the housing, allowing for plug-and-play operation upon external power connection, greatly facilitating use in industrial settings and providing an effective solution for the integrated design of electro-hydraulic systems. Attached Figure Description

[0021] Figure 1 This is a hydraulic schematic diagram of the electro-hydraulic rotary direct drive system described in this invention.

[0022] In the diagram, 1. Servo motor; 2. Closed-loop piston pump; 3. Two-point reversing module (composed of 3-1, symmetrical hydraulic actuator; 3-2, three-position four-way reversing valve); 4. Open-loop replenishing pump; 5. Oil tank; 6. Filter; 7. Safety valve assembly (7-1, first check valve; 7-2, second check valve; 7-3, first high-pressure relief valve; 7-4, second high-pressure relief valve); 8. Low-pressure relief valve; 9-1, first pressure sensor; 9-2, second pressure sensor; 10. Flushing valve; 11-1, first flow meter; 11-2, second flow meter; 12. Low-speed, high-torque hydraulic motor; 13. Air-cooled module (13-1, third check valve; 13-2, air cooler).

[0023] Figure 2 This is a three-dimensional appearance design drawing of the electro-hydraulic rotary direct drive system described in this invention after layout optimization.

[0024] Figure 3 This is a three-dimensional internal design diagram of the electro-hydraulic rotary direct drive system described in this invention after layout optimization.

[0025] Figure 4 This is a three-dimensional appearance dimension diagram of the electro-hydraulic rotary direct drive system described in this invention after layout optimization. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific examples:

[0027] like Figure 1 As shown, the present invention provides a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system, which mainly consists of a main oil circuit, an oil replenishment circuit, a heat dissipation circuit, and a sensor circuit.

[0028] The main oil circuit includes a servo motor 1, a closed-loop piston pump 2, a two-point reversing module 3, and a low-speed, high-torque hydraulic motor 12. The replenishment circuit includes an open-loop replenishment pump 4, an oil tank 5, a filter 6, a safety valve assembly 7, and a low-pressure relief valve 8. The two-point reversing module 3 consists of a symmetrical hydraulic actuator 3-1 and a three-position four-way reversing valve 3-2. The swashplate tilt angle of the closed-loop piston pump 2 is controlled by electromagnets at both ends of the reversing valve to achieve oil reversal in the main oil circuit. The safety valve assembly 7 consists of two symmetrically arranged sets of first check valves 7-1 and second check valves 7-2, and first high-pressure relief valves 7-3 and second high-pressure relief valves 7-4 connected in parallel. The closed-loop piston pump 2 and the open-loop replenishment pump 4 are rigidly shaft connected and coaxially driven by the servo motor 1. The closed-loop piston pump 2 directly supplies oil to the low-speed, high-torque hydraulic motor 12, forming a pump-controlled direct-drive circuit. The open-type replenishing pump 4 draws oil from the oil tank 5, passes it through the filter 6, and replenishes the low-pressure circuit of the main oil circuit. The adjustable low-pressure relief valve 8 is used to maintain the replenishing pressure. The safety valve assembly 7 can cut off the high-pressure oil circuit when the main oil circuit is over-pressurized, in order to protect the hydraulic components of the main oil circuit.

[0029] The heat dissipation circuit includes a flushing valve 10, an air-cooling module 13, and an oil tank 5. The air-cooling module 13 consists of a third one-way valve 13-1 and an air cooler 13-2 connected in parallel. The two damping orifices of the flushing valve 10 are connected in parallel to the inlet and outlet ports of the low-speed, high-torque hydraulic motor 12 in the main oil circuit, and the flushing port is connected to the leakage port of the low-speed, high-torque hydraulic motor 12. The flushing valve 10 changes the discharge direction through the damping orifices, discharging hot oil from the low-pressure pipeline in the main oil circuit through the flushing orifices (the flushing flow rate can be adjusted by the size of the damping orifices). The flushing flow rate and the external leakage flow rate of the low-speed, high-torque hydraulic motor 12 are combined and cooled by the air-cooling module 13 before flowing back to the oil tank 5. Specifically, the replenishment flow rate of the replenishment circuit is equal to the sum of the internal leakage flow rate of the closed-loop piston pump 2, the external leakage flow rate of the low-speed, high-torque hydraulic motor 12, and the flushing flow rate of the flushing valve 10.

[0030] The sensing circuit includes a first pressure sensor 9-1, a second pressure sensor 9-2, a first flow meter 11-1, and a second flow meter 11-2. The first pressure sensor 9-1 and the second pressure sensor 9-2 are respectively placed between the closed-loop piston pump 2 and the low-speed, high-torque hydraulic motor 12 in the main oil circuit, each connected in series in the high-pressure and low-pressure pipelines. Similarly, the first flow meter 11-1 and the second flow meter 11-2 are arranged in the same way as the pressure sensors, but closer to the low-speed, high-torque hydraulic motor 12. This sensor circuit is used to monitor the pressure and flow feedback of the electro-hydraulic rotary direct drive system in real time, and can be used for intelligent monitoring and real-time control.

[0031] like Figure 2 and Figure 3 As shown, this invention also proposes a layout method for a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system, specifically implemented as follows:

[0032] The system is assembled and fixed using a hexahedral shell. The arrangement method proposed in this invention minimizes the overall volume of the system components, integrates the complex hydraulic circuit inside the shell, and allows for plug-and-play functionality upon external power connection. The arrangement method consists of two steps: external arrangement and internal arrangement.

[0033] (1) External Arrangement: The main components of the system are fixed on the three main surfaces of the housing. The servo motor 1 and the air-cooled module 13, which require external power and cooling, are arranged on the outer surface of the housing. Meanwhile, the low-speed, high-torque hydraulic motor 12 is the output actuator of the system and requires an external output shaft, which is fixed on the inner side of another surface of the housing. The oil tank 5 is responsible for supplying oil to the system. Considering the convenience of oil replenishment and the reliability of oil suction conditions, it is fixed on the inner side of the top surface of the housing, and an opening is made on the top surface for oil replenishment.

[0034] (2) Internal Layout: Other components of the system are not fixed to the housing and need to be arranged inside the housing. The two-point reversing module 3 is fixed inside the closed-loop piston pump 2. The closed-loop piston pump 2 and the open-loop replenishing pump 4 are coaxially connected to the servo motor 1 through a coupling; the flushing valve 10 is directly fixed to the closed-loop piston pump 2. At the same time, the first pressure sensor 9-1 and the second pressure sensor 9-2 are directly fixed to the two pressure measuring joints of the closed-loop piston pump 2; the first flow meter 11-1 and the second flow meter 11-2 are directly connected to the low-speed, high-torque hydraulic motor 12 through a valve block.

[0035] Furthermore, all pipeline connections between hydraulic components use hydraulic hoses, and the connection method and sequence are consistent with... Figure 1 The hydraulic system circuits have the same composition.

[0036] like Figure 4 As shown, the optimized electro-hydraulic rotary direct drive system has a housing size of only 700 mm × 800 mm × 800 mm and a total volume of 0.491 m³. 3 The volumetric torque density reaches 40.73 kN·m / m 3 Compared to the current mainstream electro-hydraulic rotary system with a capacity of 10-20 kN·m / m 3 Its volumetric torque density has significant advantages.

[0037] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for arranging a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system, characterized in that, The electro-hydraulic rotary direct drive system consists of a main oil circuit, a replenishment oil circuit, a cooling circuit, and a sensor circuit. Based on this system, a layout method is proposed to minimize the internal pipeline length and system outline volume to maximize torque density. Furthermore, the electro-hydraulic rotary direct drive system is assembled and fixed through a regular hexahedral shell, with hydraulic components integrated inside the shell, achieving complete external electric drive. The pipeline connections between hydraulic components all use hydraulic hoses, and the connection method and sequence are the same as those of the main oil circuit and the replenishment oil circuit. The main oil circuit controls the swashplate tilt direction of the closed piston pump (2) based on the two-point reversing module (3) to realize the oil reversal of the main oil circuit; the closed piston pump (2) and the open replenishing pump (4) of the replenishing circuit are rigidly connected and driven coaxially through the servo motor (1) of the main oil circuit; the heat dissipation circuit includes a flushing valve (10) and an air-cooling module (13); the two damping holes of the flushing valve (10) are connected in parallel on both sides of the inlet and outlet of the hydraulic motor in the main oil circuit, and the flushing port is connected to the leakage port of the hydraulic motor; the flushing valve (10) changes the discharge direction through the damping hole, and discharges the hot oil of the low-pressure pipeline in the main oil circuit through the flushing hole. The flushing flow and the leakage flow of the hydraulic motor are combined and cooled by the air-cooling module (13) before flowing back to the oil tank; the sensor circuit includes a pressure sensor and a flow meter, which are set between the closed piston pump (2) and the hydraulic motor, respectively connected in series in the high-pressure pipeline and the low-pressure pipeline, for intelligent monitoring and real-time control; The arrangement method can minimize the internal pipeline length and system outline volume to maximize torque density. The method is divided into two steps: external arrangement and internal arrangement, depending on whether it is fixed to the shell. (1) External arrangement: The components of the electro-hydraulic rotary direct drive system are fixed on the three inner sides of the housing. The servo motor (1) and the air-cooled module (13) need to be externally powered and cooled, so they need to be arranged on the outer side of the housing. At the same time, the low-speed high-torque hydraulic motor (12) needs to be externally connected to the output shaft and fixed on the inner side of the housing. The oil tank (5) is responsible for supplying oil to the system. It is fixed on the inner side of the top surface of the housing and has a hole on the top surface for oil replenishment. (2) Internal layout: The other components of the electro-hydraulic rotary direct drive system are not fixed to the housing and are arranged inside the housing; the two-point reversing module (3) is fixed inside the closed plunger pump (2); the closed plunger pump (2) and the open oil replenishment pump (4) are coaxially connected to the servo motor (1) through a coupling; the flushing valve (10) is directly fixed on the closed plunger pump (2); at the same time, the two pressure sensors are directly fixed on the two pressure test joints of the closed plunger pump (2); the two flow meters are directly connected to the low-speed high-torque hydraulic motor (12) through a valve block.

2. The arrangement method of a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system according to claim 1, characterized in that, The main oil circuit includes a low-speed, high-torque hydraulic motor (12); the low-speed, high-torque hydraulic motor (12) is directly supplied with oil by a closed-loop piston pump (2), forming a pump-controlled direct drive circuit.

3. The arrangement method of a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system according to claim 1, characterized in that, The oil replenishment circuit includes a safety valve group (7) consisting of two sets of symmetrically arranged check valves and high-pressure relief valves connected in parallel, and a low-pressure relief valve (8); the open-type oil replenishment pump (4) draws oil from the oil tank (5) and replenishes the low-pressure circuit of the main oil circuit through the filter (6), and adjusts the low-pressure relief valve (8) to maintain the oil replenishment pressure; the safety valve group (7) cuts off the high-pressure oil circuit when the main oil circuit is over-pressured, in order to protect the hydraulic components of the main oil circuit.

4. The arrangement method of a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system according to claim 1, characterized in that, The flushing flow rate of the flushing valve (10) is adjusted by the size of the damping orifice.

5. The arrangement method of a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system according to claim 1, characterized in that, The replenishment flow rate of the replenishment circuit is equal to the sum of the internal leakage flow rate of the closed piston pump (2), the external leakage flow rate of the hydraulic motor, and the flushing flow rate of the flushing valve (10).

6. The arrangement method of a highly integrated, heat-dissipating, intelligent electro-hydraulic rotary direct drive system according to claim 1, characterized in that, The sensor circuit includes a first pressure sensor (9-1), a second pressure sensor (9-2), a first flow meter (11-1), and a second flow meter (11-2). The first pressure sensor (9-1) and the second pressure sensor (9-2) are respectively placed between the closed-loop piston pump (2) and the hydraulic motor in the main oil circuit, and are connected in series in the high-pressure pipeline and the low-pressure pipeline, respectively. The first flow meter (11-1) and the second flow meter (11-2) are arranged in the same way as the pressure sensor, but are closer to the hydraulic motor, and are used to monitor the pressure and flow feedback of the electro-hydraulic rotary direct drive system in real time.

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