Electro-hydraulic four-cylinder parallel rotation driving system

Abstract

The invention relates to the technical field of hydraulic transmission and rotation driving, and provides an electro-hydraulic four-cylinder parallel rotation driving system. The system comprises an end plate, a rotary output shaft, a hydraulic cylinder assembly, a rotary switching mechanism and an electro-hydraulic control unit, and piston rods in the rotary output shaft and the hydraulic cylinder assembly are fixed to the end plate to form a symmetrical hydraulic cylinder structure. Cylinder barrels of the hydraulic cylinder assemblies do linear reciprocating motion relative to the piston rods under the control of the electro-hydraulic control unit, the linear motion is transmitted to the rotation switching mechanism through rotating connection of the sliding blocks and the driving connecting rods, and the multiple hydraulic cylinder assemblies are connected in parallel to drive the rotation output shaft to achieve rotation motion. Under the low-speed working condition, large rotation torque can be output, the structure is dispersed, the space utilization rate is high, the reliability and fault-tolerant capability of the system are improved through redundant drive design, and the system is suitable for rotation drive occasions with limited space and high reliability requirements.

Description

Technical Field

[0001] This invention relates to the field of hydraulic transmission and rotary drive technology, specifically to an electro-hydraulic four-cylinder parallel rotary drive system. Background Technology

[0002] In existing rotary drive systems, electric motors or hydraulic motors are typically used as the power source, and rotary output is achieved through a reduction gear to meet the equipment's requirements for speed and torque. However, under low-speed, high-torque conditions, electric motors or hydraulic motors often require a large reduction gear, resulting in a complex system structure, increased size and weight, and difficulty in installation and layout in certain confined spaces.

[0003] In certain operating environments, due to limitations in installation space, structural form, or usage conditions, electric motors or hydraulic motors are difficult to apply directly, resulting in certain shortcomings in space utilization of existing rotary drive solutions. Most existing rotary drive systems use a single power unit; when the power unit fails, the system often cannot continue operating, leading to low overall reliability and making it difficult to meet the requirements of applications demanding continuous operation and high safety.

[0004] Therefore, how to achieve low-speed, high-torque rotary drive under confined space conditions and improve the system's reliability and fault tolerance has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an electro-hydraulic four-cylinder parallel rotary drive system to solve the problems of insufficient torque output capability under low-speed conditions, difficulty in arrangement in confined spaces, and low system reliability of existing rotary drive systems.

[0006] To achieve the above objectives, the present invention provides an electro-hydraulic four-cylinder parallel rotary drive system, including an end plate, a rotary output shaft, a hydraulic cylinder assembly, a transmission mechanism for converting the linear motion of the hydraulic cylinder assembly into the rotational motion of the rotary output shaft, and an electro-hydraulic control unit. The hydraulic cylinder assembly is arranged circumferentially along the rotary output shaft and forms a parallel drive structure. The electro-hydraulic control unit coordinates and controls the hydraulic cylinder assembly to drive the rotary output shaft to achieve rotary motion.

[0007] Preferably, the electro-hydraulic control unit is configured to perform synchronous or group control of the hydraulic cylinder assembly under low-speed conditions, so that the rotary output shaft can output a large rotary torque at low speed.

[0008] Preferably, the hydraulic cylinder assembly is arranged in a distributed manner, so that the drive system forms a distributed structure, which is suitable for use in situations where it is not suitable to install an electric motor or hydraulic motor, and improves the space utilization of the system.

[0009] Preferably, the hydraulic cylinder assembly forms a redundant drive structure. When some hydraulic cylinders in the hydraulic cylinder assembly fail, the failed hydraulic cylinder is controlled to be in a free state, and the remaining hydraulic cylinders continue to drive the rotary output shaft when the power is sufficient, so as to realize the continuous operation of the system for a certain period of time.

[0010] Compared with the prior art, the present invention drives the rotary output shaft in parallel with hydraulic cylinder components, which can obtain a large rotary output torque under low-speed conditions. At the same time, the distributed arrangement improves space utilization, and the redundant drive structure design enhances the reliability and fault tolerance of the system. Attached Figure Description

[0011] Figure 1 A schematic diagram of the overall structure of the electro-hydraulic four-cylinder parallel rotary drive system provided by the present invention;

[0012] Figure 2 for Figure 1 The diagram shows the structure of the hydraulic cylinder assembly.

[0013] Figure 3 for Figure 1 The schematic diagram of the rotary conversion mechanism is shown below;

[0014] The following numbers are labeled in the diagram: 1-1, end plate; 2-1, slider-type connecting rod connector; 2-2, piston rod; 2-3, cylinder; 2-4, control valve; 2-5, slider; 3-1, bearing; 3-2, rotary output shaft; 3-3, drive connecting rod; 3-4, conversion block. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that the specific embodiments described in this invention are only for explaining the present invention and are not intended to limit the scope of protection of the present invention.

[0016] like Figure 1 As shown, the electro-hydraulic four-cylinder parallel rotary drive system 1 provided by the present invention includes an end plate 1-1, a hydraulic cylinder assembly 2 disposed on the end plate 1-1, and a rotary conversion mechanism 3 connected to the hydraulic cylinder assembly 2. Multiple hydraulic cylinder assemblies 2 are arranged circumferentially along the rotary output shaft, and the rotary conversion mechanism 3 jointly drives the rotary output shaft 3-2 to achieve rotary motion.

[0017] In this embodiment, the two ends of the rotary output shaft 3-2 are mounted on the end plate 1-1 via bearings 3-1, and the two ends of the piston rod 2-2 in the hydraulic cylinder assembly 2 are also fixed to the end plate 1-1, so that the piston rod 2-2 remains relatively fixed during operation, thus forming a symmetrical hydraulic cylinder structure.

[0018] like Figure 2As shown, the hydraulic cylinder assembly 2 includes a cylinder 2-3, a piston rod 2-2 passing through and disposed within the cylinder 2-3, a control valve 2-4 disposed on the hydraulic cylinder assembly 2, and a slider-type connecting rod connecting seat 2-1 disposed outside the cylinder 2-3. The slider-type connecting rod connecting seat 2-1 is provided with a slider 2-5, which is used to connect with the drive connecting rod to form a connection relationship that allows the drive connecting rod to rotate relative to each other.

[0019] In this embodiment, the slider 2-5 is used to form a rotatable connection with the drive link 3-3, so that the drive link 3-3 can adjust its angle according to the motion state during the operation of the hydraulic cylinder assembly 2, thereby adapting to the axial reciprocating motion of the cylinder 2-3 relative to the piston rod 2-2 and reducing the influence of lateral force on the hydraulic cylinder assembly 2 and the drive link 3-3.

[0020] like Figure 3 As shown, the rotary conversion mechanism 3 includes a rotary output shaft 3-2, a bearing 3-1 for supporting the rotary output shaft 3-2, a conversion block 3-4 connected to the rotary output shaft 3-2, and a drive link 3-3 connected to the conversion block 3-4. One end of the drive link 3-3 is connected to the slider 2-5 of the hydraulic cylinder assembly 2, and the other end is connected to the conversion block 3-4.

[0021] Combination Figures 1 to 3 In the specific embodiment shown, when the hydraulic cylinder assembly 2 works under the control of the control valve 2-4, a pressure difference is formed inside the hydraulic cylinder assembly 2, causing the cylinder 2-3 to reciprocate linearly along the axial direction relative to the fixed piston rod 2-2. The linear motion is transmitted to the drive connecting rod 3-3 through the slider-type connecting seat 2-1 and the slider 2-5 inside it. The slider 2-5 provides relative rotational freedom to the drive connecting rod 3-3 during the force transmission process.

[0022] The drive link 3-3 transmits the linear driving force from multiple hydraulic cylinder assemblies 2 to the conversion block 3-4, causing the conversion block 3-4 to rotate around the axis of the rotary output shaft 3-2 under the combined action of multiple drive links 3-3, thereby driving the rotary output shaft 3-2 to achieve rotary output.

[0023] Example 1:

[0024] In combination Figures 1 to 3 In the specific embodiment shown, multiple hydraulic cylinder assemblies 2 work synchronously under the control of the electro-hydraulic control unit. The cylinder barrel 2-3 of each hydraulic cylinder assembly 2 moves linearly back and forth relative to the piston rod 2-2, and applies force to the conversion block 3-4 through their respective corresponding sliders 2-5 and drive connecting rods 3-3, so that the rotary output shaft 3-2 rotates continuously at a stable speed.

[0025] In this embodiment, the output forces of each hydraulic cylinder assembly 2 are driven synchronously in parallel, so that the resultant torque is formed at the rotary conversion mechanism 3, thereby obtaining a large rotary output torque under low-speed conditions.

Claims

1. An electro-hydraulic four-cylinder parallel rotary drive system, characterized in that, The device includes an end plate 1-1, a rotary output shaft 3-2, a hydraulic cylinder assembly 2, a rotary conversion mechanism 3, and an electro-hydraulic control unit. The two ends of the rotary output shaft 3-2 are mounted on the end plate 1-1 via bearings 3-1. The hydraulic cylinder assembly 2 is arranged circumferentially along the rotary output shaft 3-2. The hydraulic cylinder assembly 2 is connected to the rotary output shaft 3-2 via the rotary conversion mechanism 3. The electro-hydraulic control unit is connected to the hydraulic cylinder assembly 2 and is used to control the movement of the hydraulic cylinder assembly 2 to drive the rotary output shaft 3-2 to achieve rotary motion.

2. The electro-hydraulic four-cylinder parallel rotary drive system according to claim 1, characterized in that, The hydraulic cylinder assembly 2 includes a cylinder 2-3, a piston rod 2-2 that passes through the cylinder 2-3, and a control valve 2-4 that is mounted on the cylinder 2-3. The two ends of the piston rod 2-2 are fixed to the end plate 1-1, so that the piston rod 2-2 remains relatively fixed during operation. Under the control of the control valve 2-4, the cylinder 2-3 reciprocates linearly relative to the piston rod 2-2 along the axial direction.

3. The electro-hydraulic four-cylinder parallel rotary drive system according to claim 2, characterized in that, The cylinder 2-3 of the hydraulic cylinder assembly 2 is provided with a slider-type connecting rod connecting seat 2-1. The slider-type connecting rod connecting seat 2-1 is provided with a slider 2-5. The slider 2-5 is used to connect with the drive connecting rod 3-3 in the rotary conversion mechanism 3 so as to transmit the linear motion of the cylinder 2-3 relative to the piston rod 2-2 to the drive connecting rod 3-3 and form a connection relationship that allows the drive connecting rod 3-3 to rotate relative to each other.

4. The electro-hydraulic four-cylinder parallel rotary drive system according to claim 3, characterized in that, The rotary conversion mechanism 3 includes a conversion block 3-4 fixedly connected to the rotary output shaft 3-2 and multiple drive links 3-3 connected to the conversion block 3-4. One end of the drive link 3-3 is connected to the corresponding hydraulic cylinder assembly 2 through the slider 2-5, and the other end is connected to the conversion block 3-4, so that the linear driving force generated by the multiple hydraulic cylinder assemblies 2 is combined at the conversion block 3-4 into a rotary torque that drives the rotary output shaft 3-2 to rotate.

5. The electro-hydraulic four-cylinder parallel rotary drive system according to claim 1, characterized in that, The electro-hydraulic control unit is configured to synchronously or in groups control multiple hydraulic cylinder assemblies 2, so that the multiple hydraulic cylinder assemblies 2 work together to drive the rotary conversion mechanism 3, thereby enabling the rotary output shaft 3-2 to output a large rotary torque under low speed conditions.

6. The electro-hydraulic four-cylinder parallel rotary drive system according to claim 1, characterized in that, The hydraulic cylinder assembly 2 forms a parallel redundant drive structure. When some of the hydraulic cylinders in the hydraulic cylinder assembly 2 fail, the faulty hydraulic cylinder is put into a free state through the electro-hydraulic control unit. The remaining hydraulic cylinders continue to drive the rotary output shaft 3-2 through the rotary conversion mechanism 3 when the power is sufficient.

7. The electro-hydraulic four-cylinder parallel rotary drive system according to claim 1, characterized in that, The hydraulic cylinder assembly 2 is disposed in a distributed manner on the end plate 1-1 and distributed circumferentially along the rotary output shaft 3-2, so that the rotary drive system forms a distributed structure, which is suitable for use in situations where it is not appropriate to install an electric motor or hydraulic motor.

8. The electro-hydraulic four-cylinder parallel rotary drive system according to claim 1, characterized in that, The hydraulic cylinder assembly 2 includes four hydraulic cylinders, which are evenly arranged circumferentially along the rotary output shaft 3-2 and form a four-cylinder parallel drive structure.

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