A hybrid manufacturing single-axis electro-hydraulic driving system

Abstract

The utility model provides a kind of fusion manufacturing single-shaft electro-hydraulic drive system, belong to intelligent hydraulic control field. Including integrated single-shaft motor pump device, its motor pump shell is equipped with embedded oil passage, for communicating plunger pump core and booster oil tank;Control valve group, install at the oil outlet of integrated single-shaft motor pump device front end, integrated pressure regulating valve, pressure sensor, temperature sensor, reversing valve and on-off valve;Booster oil tank, built-in rubber skin bag, coaxially installed in integrated single-shaft motor pump device end, through embedded oil passage to plunger pump core oil supplement and for servo motor heat dissipation. The utility model is integrated by integrated single-shaft motor pump device and booster oil tank, eliminates traditional coupling and redundant pipeline, significantly reduces the number of parts and improves response speed;Embedded oil passage delivers booster oil tank oil to plunger pump core, synchronously realizes oil supplement and heat dissipation when flowing through servo motor, solves the problem of temperature rise of traditional system.

Description

Technical Field

[0001] This utility model belongs to the field of intelligent hydraulic control and relates to an integrated manufacturing single-axis electro-hydraulic drive system. Background Technology

[0002] Concrete pump trucks, as essential equipment on construction sites, possess enormous market potential. Pump truck boom systems are evolving towards longer booms, more sections, more responsive control, and more intelligent material placement. Traditional pump truck boom hydraulic systems typically employ centralized oil sources, multiple hydraulic actuators, and complex pipeline systems, resulting in slow response, significant vibration, heavy weight, and complex piping. These issues limit further boom development. Therefore, high response, high controllability, lightweight design, and minimally simplistic piping are the development goals for pump truck boom hydraulic systems. Summary of the Invention

[0003] To address the problems of large mass, complex piping system, and high energy consumption in traditional concrete pump truck boom hydraulic systems, this invention develops an integrated manufacturing single-axis electro-hydraulic drive system.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A single-axis electro-hydraulic drive system for integrated manufacturing includes:

[0006] An integrated single-shaft motor pump unit has an embedded oil passage inside the motor pump housing to connect the plunger pump core in the integrated single-shaft motor pump unit with the external booster oil tank.

[0007] The control valve assembly is installed at the oil outlet of the front end of the integrated single-shaft motor pump unit. It integrates a pressure regulating valve, pressure sensor, temperature sensor, reversing valve and on / off valve. The valve block is made of 3D printed stainless steel.

[0008] The booster oil tank, with a built-in rubber bladder, is coaxially mounted at the end of the integrated single-shaft motor pump unit. It replenishes oil to the plunger pump core through an embedded oil passage and dissipates heat from the servo motor in the integrated single-shaft motor pump unit.

[0009] As a preferred embodiment of this utility model, the embedded oil passage penetrates through the housing of the motor pump, with one end connected to the oil outlet of the booster oil tank and the other end connected to the oil suction port of the plunger pump core.

[0010] As a preferred embodiment of this utility model, the plunger pump core of the integrated single-shaft motor pump device is directly connected to the servo motor rotor through a transmission component.

[0011] As a preferred embodiment of this invention, the transmission component is an internal spline.

[0012] As a preferred embodiment of this utility model, the encoder of the integrated single-shaft motor pump device is installed on the end of the servo motor rotor shaft and located on the side of the booster oil tank.

[0013] As a preferred embodiment of this utility model, the integrated single-axis motor pump device has an external servo motor drive and control unit on the motor pump housing. It is connected to an encoder, pressure sensor, temperature sensor, reversing valve, on / off valve and pressure regulating valve through multiple sets of aviation connectors. The hydraulic cylinder closed-loop control is achieved by driving the reversing valve, on / off valve and pressure regulating valve.

[0014] As a preferred embodiment of this invention, the bearing mounting grooves inside the motor pump housing are located on both sides of the servo motor rotor to support the rotor shaft and reduce axial vibration.

[0015] As a preferred embodiment of this invention, a number of embedded oil passages are evenly distributed in a ring shape within the motor pump housing.

[0016] The beneficial effects of this utility model are:

[0017] (1) This utility model adopts a single-shaft structure design, which integrates the integrated single-shaft motor pump device and the booster oil tank coaxially. This design eliminates the couplings and connecting pipelines required by the traditional split system, significantly reducing the number of parts. The coaxial layout greatly shortens the oil transmission path, fundamentally solving the problem of slow response in the traditional system.

[0018] (2) An embedded oil passage is designed based on the single-shaft design. The oil passage runs through the stator and rotor mounting slot area of ​​the motor pump housing, directly delivering the low-temperature oil from the booster oil tank to the oil suction port of the plunger pump core. During this process, the oil flows around the stator and rotor of the servo motor, carrying away the motor heat through active heat exchange. This integrated heat dissipation design eliminates the need for an additional cooling device, simultaneously addressing the two major needs of plunger pump oil replenishment and motor cooling. Attached Figure Description

[0019] Figure 1 This is a three-dimensional diagram of a single-axis electro-hydraulic drive system that integrates manufacturing processes.

[0020] Figure 2 This is a cross-sectional view of a uniaxial electro-hydraulic drive system.

[0021] Figure 3 This is a structural diagram of the housing of an integrated single-shaft motor pump unit;

[0022] In the diagram: 1-Integrated single-shaft motor pump unit, 2-Control valve group, 3-Booster oil tank, 10-Motor pump housing, 101-Oil outlet, 102-Embedded oil passage, 103-Stator and rotor mounting slot, 104-Bearing mounting slot, 105-Transmission component mounting slot, 106-Pump core mounting slot, 11-Plunger pump core, 12-Encoder, 13-Bearing, 14-Servo motor stator and rotor, 15-First end cover, 16-Second end cover, 17-Transmission component, 18-Servo motor drive and control integrated machine, 21-Pressure sensor, 22-Temperature sensor, 23-Pressure regulating valve, 24-Reversing valve, 25-On / off valve, 31-Rubber bladder, 32-Oil tank body, 33-Air inlet. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" or "several" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0026] The accompanying drawings show various structural schematic diagrams according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, while others may have been omitted.

[0027] like Figure 1-3This utility model proposes an integrated manufacturing single-shaft electro-hydraulic drive system, including an integrated single-shaft motor pump device 1, a control valve group 2, and a booster oil tank 3. The booster oil tank 3 is installed at the end of the integrated single-shaft motor pump device 1 and coaxially connected. The control valve group 2 is installed on the integrated single-shaft motor pump device 1 and connected to the oil outlet 101 at the front end of the integrated single-shaft motor pump device 1.

[0028] The integrated single-shaft motor pump device 1 includes a motor pump housing 10, a plunger pump core 11, an encoder 12, a bearing 13, a servo motor stator and rotor 14, a first end cover 15, a second end cover 16, a transmission component 17, and a servo motor drive and control integrated machine 18.

[0029] like Figure 3 As shown, the motor pump housing 10 is an integral casting with multiple functional slots integrated inside. The pump core mounting slot 106 is located at the front end and is used to install the plunger pump core 11. The transmission component mounting slot 105 is adjacent to the pump core mounting slot 106 and is used to install the transmission component 17 to connect the plunger pump core 11 with the servo motor rotor. The stator and rotor mounting slot 103 is located in the middle of the housing and is used to install the servo motor stator and rotor 14. The bearing mounting slots 104 are located on both sides of the stator and rotor mounting slot 103 and are used to install bearings 13 to support the rotor shaft. The embedded oil passage 102 extends from the rear end to the pump core mounting slot 106 along the inner wall of the housing. One end of the embedded oil passage 102 is connected to the oil outlet of the booster oil tank 3 and the other end is connected to the oil suction port of the plunger pump core 11. It is used to transport the oil from the booster oil tank 3 to the plunger pump core 11 for oil replenishment and to cool the servo motor stator and rotor 14. There are several embedded oil passages, which are evenly distributed in a ring inside the motor pump housing.

[0030] The plunger pump core 11 is installed in the pump core mounting slot 106 and connected to the servo motor rotor via the transmission component 17; the servo motor stator and rotor 14 are installed in the stator and rotor mounting slot 103; the encoder 12 is connected to the servo motor rotor shaft end and located on the side of the booster oil tank 3, and is fixed by screws; the bearing 13 is installed in the bearing mounting slot 104, located on both sides of the servo motor stator and rotor 14; the first end cover 15 and the second end cover 16 are respectively sealed at both ends of the motor pump housing 10 by bolts. The servo motor drive and control integrated unit 18 is installed on the top of the motor pump housing 10 and connected to the servo motor stator via a cable. The cable transmits three-phase AC power to the stator coil, driving the rotor to rotate and generate torque.

[0031] The control valve assembly 2 is bolted to the side of the motor pump housing 10 and directly connected to the oil outlet 101. The control valve assembly 2 includes a valve block, a pressure sensor 21, a temperature sensor 22, a pressure regulating valve 23, a reversing valve 24, and an on / off valve 25. The valve block is made of 3D printed stainless steel. The pressure sensor 21, temperature sensor 22, pressure regulating valve 23, reversing valve 24, and on / off valve 25 are all integrated on the valve block. The pressure regulating valve 23 is connected in parallel to the oil outlet line and is used to control the maximum working pressure of the system. The pressure sensor 21 detects the oil outlet pressure, the temperature sensor 22 detects the hydraulic oil temperature, the reversing valve 24 controls the flow of hydraulic oil to the hydraulic cylinder, and the on / off valve 25 controls the opening and closing of the pipeline.

[0032] The booster tank 3 includes a tank body 31, a rubber bladder 32, and an air intake 33. Its oil outlet is connected to the embedded oil passage 102, and the air intake 33 of the rubber bladder 32 is connected to the outside of the tank.

[0033] In one specific embodiment of this utility model, the transmission component 17 has an internal spline structure, realizing direct power transmission between the plunger pump core 11 and the servo motor rotor.

[0034] In one specific embodiment of this utility model, a servo motor drive and control integrated machine 18 is installed on the motor pump housing 10. It is connected to the servo motor stator via a cable and externally connected to an aviation connector. It is used to collect signals from the pressure sensor 21, the temperature sensor 22 and the displacement signal of the external hydraulic cylinder, and simultaneously drive the reversing valve 24.

[0035] This utility model adopts a coaxial integrated structure. The booster oil tank 3 is fixed to the end of the motor pump housing 10 via a flange connection. The two are coaxially designed, eliminating the need for traditional pipeline connections. The oil outlet of the booster oil tank 3 is directly aligned with the inlet of the embedded oil passage 102. During operation, the servo motor drive control unit 18 drives the servo motor stator, which in turn drives the rotor to rotate. The rotor directly drives the plunger pump core 11 through the transmission component 17. When the plunger pump core 11 draws in oil, the rubber bladder inside the booster oil tank 3 maintains a constant pressure, and the oil enters the oil inlet of the plunger pump core 11 through the embedded oil passage 102. As the oil flows through the embedded oil passage 102, it also flows through the stator and rotor mounting groove 103 area, cooling the servo motor rotor. After pressurizing the oil, the plunger pump core 11 outputs it from the oil outlet 101 to the control valve group 2 to drive the pump truck boom. The hydraulic cylinder return oil returns to the booster oil tank 3 via the reversing valve 24, completing the cycle.

[0036] The control logic of the servo motor drive and control unit 18 includes: adjusting the motor speed in a closed loop according to the speed signal fed back by the encoder 12, thereby accurately controlling the output flow; driving the reversing valve 24 according to external commands to change the oil flow direction to realize the extension and retraction of the hydraulic cylinder; monitoring the pressure in real time through the pressure sensor 21, and opening the pressure regulating valve 23 to release pressure when the pressure exceeds the set value; monitoring the oil temperature through the temperature sensor 22, and reducing the output power of the system when the temperature exceeds the set value.

[0037] The above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A single-axis electro-hydraulic drive system for integrated manufacturing, characterized in that, include: An integrated single-shaft motor pump unit has an embedded oil passage inside the motor pump housing to connect the plunger pump core in the integrated single-shaft motor pump unit with the external booster oil tank. The control valve assembly is installed at the oil outlet of the front end of the integrated single-shaft motor pump unit. It integrates a pressure regulating valve, pressure sensor, temperature sensor, reversing valve and on / off valve. The valve block is made of 3D printed stainless steel. The booster oil tank, with a built-in rubber bladder, is coaxially mounted at the end of the integrated single-shaft motor pump unit. It replenishes oil to the plunger pump core through an embedded oil passage and dissipates heat from the servo motor in the integrated single-shaft motor pump unit.

2. The integrated manufacturing single-axis electro-hydraulic drive system according to claim 1, characterized in that, The embedded oil passage runs through the housing of the motor pump, with one end connected to the oil outlet of the booster oil tank and the other end connected to the oil suction port of the plunger pump core.

3. The integrated manufacturing single-axis electro-hydraulic drive system according to claim 1, characterized in that, The plunger pump core of the integrated single-shaft motor pump device is directly connected to the servo motor rotor through a transmission component.

4. The integrated manufacturing single-axis electro-hydraulic drive system according to claim 3, characterized in that, The transmission component is an internal spline.

5. The integrated manufacturing single-axis electro-hydraulic drive system according to claim 3, characterized in that, The encoder of the integrated single-shaft motor pump unit is mounted on the end of the servo motor rotor shaft and located on the side of the booster oil tank.

6. The integrated manufacturing single-axis electro-hydraulic drive system according to claim 5, characterized in that, The integrated single-axis motor pump device has an external servo motor drive and control unit on the motor pump housing. It is connected to an encoder, pressure sensor, temperature sensor, reversing valve, on / off valve and pressure regulating valve through multiple sets of aviation connectors. The hydraulic cylinder is closed-loop controlled by driving the reversing valve, pressure regulating valve and on / off valve.

7. The integrated manufacturing single-axis electro-hydraulic drive system according to claim 1, characterized in that, The bearing mounting slots inside the motor pump housing are located on both sides of the servo motor rotor to support the rotor shaft and reduce axial vibration.

8. The integrated manufacturing single-axis electro-hydraulic drive system according to claim 1, characterized in that, Several embedded oil passages are evenly distributed in a ring shape inside the motor pump housing.

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