Electric hydraulic system based on distributed electric drive and hydraulic support with same

Abstract

The present application relates to the technical field of hydraulic support and discloses an electric hydraulic system based on distributed electric drive and a hydraulic support with the same, the electric hydraulic system comprising a driving unit, the driving unit comprising a motor, a hydraulic pump, a hydraulic cylinder, a buffer tank and a first controller, the hydraulic pump being connected with the motor so that the motor drives the hydraulic pump to rotate, the hydraulic pump having a first interface and a second interface, either of the first interface and the second interface discharging liquid when the other one is discharging liquid, the hydraulic cylinder comprising a rod cavity and a rodless cavity, the first interface being communicated with the rod cavity, the second interface being communicated with the rodless cavity, the buffer tank being arranged between the first interface and the rod cavity or between the second interface and the rodless cavity so that the buffer tank compensates for the flow difference between the rod cavity and the rodless cavity; the first controller being connected with the motor for supplying power to the motor and controlling the motor. The electric hydraulic system and the hydraulic support with the same have the advantages of convenient installation, small volume, fast response speed, strong synchronism, high control precision, reliability, stability and high energy efficiency.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic support technology, specifically relating to an electro-hydraulic system based on distributed electric drive and a hydraulic support having the same. Background Technology

[0002] Hydraulic support plates are used to support the coal face and prevent spalling. For high-extraction longwall faces, a three-stage support mechanism is required to fully support the coal face height. In related technologies, the three-stage support mechanism generally uses hydraulic drive, that is, three hydraulic jacks drive the three-stage support plates separately, powered by a centralized emulsion pump station. This traditional hydraulic drive method has many inherent defects, such as: 1. Poor synchronization: Due to differences in hydraulic pipeline characteristics and the compressibility of liquids, the three jacks are difficult to achieve precise synchronous movement, often resulting in "jamming," affecting the support effect and easily damaging the mechanism. 2. Slow response speed: The hydraulic signal transmission delay in long pipelines is large, resulting in slow response of the support plate movement, which cannot meet the requirements of rapid follow-up automation. 3. Low control precision: It is difficult to accurately control the extension position and supporting force of the support plate, making adaptive support impossible. 4. Poor reliability: The hydraulic system has many seals and joints, which are prone to leakage, resulting in a high failure rate and a large maintenance workload. 5. Low energy efficiency: Centralized pumping stations need to operate continuously, resulting in large pressure losses in long pipelines and low energy utilization efficiency. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose an electro-hydraulic system based on distributed electric drive. This system enables separate arrangement of drive units, unified control through a central controller, and is characterized by convenient installation, small size, fast response, strong synchronization, high control precision, and high reliability, stability, and energy efficiency.

[0004] This invention also proposes a hydraulic support, in which the three interlocking plates can operate synchronously and be controlled collaboratively with high control precision.

[0005] The electro-hydraulic system based on distributed electric drive according to an embodiment of the present invention includes a drive unit, which includes a motor, a hydraulic pump, a hydraulic cylinder, a buffer tank and a first controller; The hydraulic pump is connected to the motor so that the motor drives the hydraulic pump to rotate. The hydraulic pump has a first interface and a second interface, wherein liquid enters through either the first interface or the second interface and exits through the other. The hydraulic cylinder includes a rod chamber and a rodless chamber, wherein the first interface communicates with the rod chamber and the second interface communicates with the rodless chamber. A buffer tank is disposed between the first interface and the rod chamber or between the second interface and the rodless chamber to compensate for the flow difference between the rod chamber and the rodless chamber. The first controller is connected to the motor to supply power to the motor and control the motor.

[0006] The electro-hydraulic system based on distributed electric drive in this embodiment can effectively shorten the pipeline layout and control delay of traditional hydraulic systems by driving hydraulic cylinders with an electric motor. It can also improve control accuracy, has a high degree of intelligence, fast response, high integration, and small size, making it suitable for deployment in various scenarios.

[0007] In some embodiments, the drive unit further includes a first main pipeline, a second main pipeline, and a safety component. The first main pipeline connects the first interface to the rod-mounted cavity; the second main pipeline connects the second interface to the rodless cavity; the safety component is disposed between the first main pipeline and the second main pipeline and has a safety pressure value. The safety component is used so that when the pressure value of the medium in either the first main pipeline or the second main pipeline exceeds the safety pressure value, the medium can flow through the safety component to the other.

[0008] In some embodiments, the safety component includes a first safety line, a first safety valve, a second safety line, and a second safety valve. The first safety line is disposed between the first main line and the second main line. The first safety valve is disposed on the first safety line and is used to allow the medium in the first main line to flow towards the second main line via the first safety line and the first safety valve when the pressure value of the first main line exceeds the safety pressure value. The second safety line is disposed between the first main line and the second main line. The second safety valve is disposed on the second safety line and is used to allow the medium in the second main line to flow towards the first main line via the second safety line and the second safety valve when the pressure value of the second main line exceeds the safety pressure value.

[0009] In some embodiments, the first safety valve and the second safety valve are both relief valves, wherein the inlet of the first safety valve is connected to the first main pipeline, and the outlet of the first safety valve is connected to the second main pipeline; the inlet of the second safety valve is connected to the second main pipeline, and the outlet of the second safety valve is connected to the first main pipeline.

[0010] In some embodiments, the drive unit further includes a first buffer pipeline, a second buffer pipeline, a first valve, and a second valve. The first buffer pipeline connects the buffer tank and the first main pipeline. The first valve is disposed on the first buffer pipeline for controlling the opening or closing of the first buffer pipeline. The second buffer pipeline connects the buffer tank and the second main pipeline. The second valve is disposed on the second buffer pipeline for controlling the opening or closing of the second buffer pipeline. The first valve and the second valve are electrically connected to the first controller. When liquid is discharged from the first port, the first controller controls the first valve to close and the second valve to open. When liquid is discharged from the second port, the first controller controls the first valve to open and the second valve to close.

[0011] In some embodiments, the drive unit further includes a speed sensor, a first pressure sensor, a second pressure sensor, and a displacement sensor. The speed sensor is disposed on the motor and electrically connected to the first controller, and is used to feed back the rotational speed information of the motor to the first controller. The first pressure sensor is disposed on the first main pipeline and electrically connected to the first controller, and is used to feed back the pressure value information of the first main pipeline to the first controller. The second pressure sensor is disposed on the second main pipeline and electrically connected to the first controller, and is used to feed back the pressure value information of the second main pipeline to the first controller. The displacement sensor is disposed on the piston rod of the hydraulic cylinder and electrically connected to the first controller, and is used to feed back the displacement information of the piston rod to the first controller.

[0012] In some embodiments, the hydraulic pump is a bidirectional hydraulic pump; And / or, the buffer tank is filled with a medium and the buffer tank is pressurized.

[0013] In some embodiments, there are multiple driving units, and the multiple driving units can be arranged in a distributed manner.

[0014] In some embodiments, the electro-hydraulic system based on distributed electric drive further includes a power module and a central controller. The power module is electrically connected to and supplies power to the plurality of first controllers. The central controller is connected to the plurality of first controllers and is used to read feedback information from the plurality of first controllers and control the plurality of first controllers.

[0015] The electro-hydraulic system based on distributed electric drive in the above embodiments achieves distributed electric drive by distributing multiple drive units and centrally controlling them through a central controller. In addition, safety components, buffer tanks, etc. ensure the stable operation of the entire system.

[0016] The hydraulic support of this invention includes hydraulic actuators and an electro-hydraulic system based on distributed electric drive. The hydraulic actuators include at least some of the following: column jacks, pushing jacks, balancing jacks, front beam jacks, side pushing jacks, side guard jacks, telescopic beam jacks, tail beam jacks, insert plate jacks, bottom lifting jacks, pull-back sliding jacks, and anti-tipping and anti-slip jacks. The electro-hydraulic system based on distributed electric drive is any one of the electro-hydraulic systems based on distributed electric drive described in the above embodiments. Wherein, at least a portion of the hydraulic actuators are connected to the hydraulic pump in the electro-hydraulic system based on distributed electric drive; And / or, at least some of the hydraulic actuators are hydraulic cylinders of the electro-hydraulic system based on distributed electric drive.

[0017] In some implementations, the side support jacks include a first side support jack, a second side support jack, and a third side support jack, wherein the first side support jack, the second side support jack, and the third side support jack each employ a drive unit and a hydraulic cylinder within that drive unit.

[0018] The hydraulic support implemented in this paper utilizes a drive unit in a distributed electric-driven electro-hydraulic system instead of a traditional hydraulic cylinder, offering the following advantages: 1. High overall energy efficiency: Eliminates pressure loss over long pipelines, allows the motor to start and stop on demand, eliminates overflow losses, and significantly improves overall system energy efficiency. 2. High reliability: Distributed layout ensures that a single drive unit failure only affects local functions and does not paralyze the entire working face. Modular design supports rapid replacement, greatly reducing maintenance time. 3. Excellent control performance: Extremely fast electrical signal response enables millisecond-level precise synchronous control of multiple drive units (e.g., smooth deployment of three-stage support). Output thrust can be accurately estimated using motor current, achieving closed-loop intelligent control of force and position. 4. High safety: Eliminates the risk of high-pressure emulsion jets, resulting in a safer and cleaner working environment. 5. High level of intelligence: Enables further adaptive support and the construction of a digital platform. 6. Reduced maintenance costs: Eliminates the need for maintenance of centralized pump stations and long pipelines, reducing the consumption of seals and hydraulic oil. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of the hydraulic support according to an embodiment of the present invention.

[0020] Figure 2 This is the present invention. Figure 1 A magnified view of a portion of the image.

[0021] Figure 3 This is a schematic diagram of the structure of the driving unit of the present invention.

[0022] Figure 4 This is an overall drive diagram of an electro-hydraulic system based on distributed electric drive according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the driving unit of the present invention.

[0024] Figure label: 1. Drive unit; 101. Motor; 102. Hydraulic pump; 103. Hydraulic cylinder; 1031. Rod chamber; 1032. Rodless chamber; 104. Buffer tank; 105. First controller; 106. First main pipeline; 107. Second main pipeline; 108. Safety components; 1081. First safety line; 1082. First safety valve; 1083. Second safety line; 1084. Second safety valve; 109. First buffer line; 110. First valve; 111. Second buffer line; 112. Second valve; 113. Speed ​​sensor; 114. First pressure sensor; 115. Second pressure sensor; 116. Displacement sensor; 2. Power supply module; 3. Central controller; 4. First support jack; 5. Second auxiliary jack; 6. The third protective jack. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] like Figure 1 , Figure 2 As shown, the electro-hydraulic system based on distributed electric drive in this embodiment of the invention includes a drive unit 1, which includes a motor 101, a hydraulic pump 102, a hydraulic cylinder 103, a buffer tank 104, and a first controller 105.

[0027] Hydraulic pump 102 is connected to motor 101 so that motor 101 drives hydraulic pump 102 to rotate. Hydraulic pump 102 has a first port and a second port, and when liquid enters the first port and liquid exits the second port, liquid exits the other port. Hydraulic cylinder 103 includes a rod chamber 1031 and a rodless chamber 1032. The first port communicates with rod chamber 1031, and the second port communicates with rodless chamber 1032. Buffer tank 104 can be disposed between the first port and rod chamber 1031 or between the second port and rodless chamber 1032 to compensate for the flow difference between rod chamber 1031 and rodless chamber 1032. First controller 105 is connected to motor 101 to supply power to motor 101 and control motor 101.

[0028] This embodiment of the distributed electric drive-based electro-hydraulic system utilizes a motor 101 to drive a hydraulic pump 102, which in turn drives the telescopic rod of a hydraulic cylinder 103 for extension and retraction. Compared to traditional methods that use centralized emulsification pump stations and complex high-pressure pipelines to drive jacks, this embodiment eliminates the need for complex pipeline and valve arrangements. Furthermore, the motor 101, hydraulic pump 102, and hydraulic cylinder 103 can be integrated into a highly integrated design, thereby simplifying the liquid transmission path to the greatest extent and improving response speed. The motor 101-driven system offers low energy consumption and high control precision, especially when multiple drive units 1 operate simultaneously, exhibiting high synchronization.

[0029] In this embodiment, hydraulic oil is used as the flowing medium in the entire drive unit 1. When the motor 101 rotates forward, fluid flows out from the first port and returns from the second port, causing the hydraulic oil in the entire drive unit 1 to flow from the rod chamber 1031 to the rodless chamber 1032, thus extending the telescopic rod in the hydraulic cylinder 103. Similarly, when the motor 101 rotates in reverse, fluid flows out from the second port and returns from the first port, causing the telescopic rod to retract. This method enables the electric motor to drive the hydraulic cylinder 103 as the drive unit 1. The first controller 105, acting as a local controller, can drive the motor 101 to move precisely, ultimately achieving precise closed-loop control of the telescopic rod in the hydraulic cylinder 103 and adaptive control of the output thrust.

[0030] In this embodiment, since the hydraulic cylinder 103 has a rod chamber 1031 and a rodless chamber 1032, the flow rates in the two chambers are inconsistent when the piston moves, resulting in a flow rate difference. By arranging a buffer tank 104 between the hydraulic pump 102 and the rodless chamber 1032, or between the hydraulic pump 102 and the rod chamber 1031, the flow rate difference can be compensated. For example, when the buffer tank 104 is located on the hydraulic pump 102 and the rodless chamber 1032, when hydraulic oil flows from the hydraulic pump 102 towards the rodless chamber 1032, a portion of the hydraulic oil in the buffer tank 104 will enter the rodless chamber 1032 to supplement the flow rate. When hydraulic oil flows from the rodless chamber 1032 towards the hydraulic pump 102, a portion of the hydraulic oil will flow into the buffer tank 104 to collect excess hydraulic oil.

[0031] In some specific embodiments, the motor 101 is a high-power-density miniature explosion-proof motor 101, the hydraulic pump 102 is a miniature bidirectional hydraulic pump 102, the buffer tank 104 is a miniature oil tank, and the hydraulic cylinder 103 is a single-rod double-acting hydraulic cylinder 103. The motor 101, hydraulic pump 102, hydraulic cylinder 103, buffer tank 104, and first controller 105 adopt a highly integrated design to reduce the overall size of the drive unit 1 and facilitate its arrangement.

[0032] In some specific embodiments, the buffer tank 104 is filled with hydraulic oil and has air pressure. There are multiple drive units 1, which can be arranged in a distributed manner.

[0033] Specifically, the bidirectional hydraulic pump 102 can be a gear pump, with the first port for inlet and the second port for outlet, or vice versa, achieved by the forward and reverse rotation of the motor 101. An air bladder can be installed inside the buffer tank 104 to fill it with gas. Hydraulic oil is filled between the air bladder and the buffer tank 104 to ensure sufficient pressure within the buffer tank 104 for pressure compensation throughout the drive unit 1. The drive unit 1 is an integrated unit combining drive (motor 101 and hydraulic pump 102), control (first controller 105), and execution (hydraulic cylinder 103), allowing for overall installation. Alternatively, it can be modularly designed, connecting existing actuators and hydraulic lines via quick-connect interfaces. For example, if the existing equipment contains a hydraulic cylinder 103 or a jack, it can be connected to the hydraulic pump 102 in the drive unit 1 via a short oil pipe, utilizing the existing jack as the execution component.

[0034] In some embodiments, the drive unit 1 further includes a first main pipeline 106, a second main pipeline 107, and a safety component 108. The first main pipeline 106 is used to connect the first interface and the rod-side cavity 1031; the second main pipeline 107 is used to connect the second interface and the rodless cavity 1032; the safety component 108 is disposed between the first main pipeline 106 and the second main pipeline 107 and has a safety pressure value. The safety component 108 is used to allow hydraulic oil to flow to the other main pipeline 107 when the pressure value of the hydraulic oil in either the first main pipeline 106 or the second main pipeline 107 exceeds the safety pressure value.

[0035] In the electro-hydraulic system based on distributed electric drive in this embodiment, the safety component 108 can effectively prevent damage to internal components caused by excessive pressure. When the pressure in the first main pipeline 106 or the second main pipeline 107 exceeds the set safety pressure value, some hydraulic oil will not enter the hydraulic cylinder 103, but will circulate through the safety component 108, thus bypassing the hydraulic cylinder 103. This effectively avoids excessive load on the hydraulic cylinder 103 and damage to the equipment.

[0036] In some specific embodiments, the first main pipeline 106 and the second main pipeline 107 are integrated into the entire drive unit 1, eliminating the need for additional pipelines and avoiding risks such as leakage and high-pressure pipe bursts caused by using oil pipes.

[0037] In some embodiments, the safety component 108 includes a first safety line 1081, a first safety valve 1082, a second safety line 1083, and a second safety valve 1084. The first safety line 1081 is disposed between a first main line 106 and a second main line 107. The first safety valve 1082 is disposed on the first safety line 1081 and is used to allow hydraulic oil in the first main line 106 to flow towards the second main line 107 via the first safety line 1081 and the first safety valve 1082 when the pressure value of the first main line 106 exceeds the safety pressure value. The second safety line 1083 is disposed between the first main line 106 and the second main line 107. The second safety valve 1084 is disposed on the second safety line 1083 and is used to allow hydraulic oil in the second main line 107 to flow towards the first main line 106 via the second safety line 1083 and the second safety valve 1084 when the pressure value of the second main line 107 exceeds the safety pressure value.

[0038] In some embodiments, the liquid outlet is connected to the first main pipeline 106, the liquid outlet of the first safety valve 1082 is connected to the second main pipeline 107, the liquid inlet of the second safety valve 1084 is connected to the second main pipeline 107, and the liquid outlet of the second safety valve 1084 is connected to the first main pipeline 106.

[0039] In the distributed electric drive-based electro-hydraulic system of this embodiment, the safety component 108 is designed with two paths and uses an overflow valve as the core protection component. The overflow valve has a certain opening pressure, which forms the safety pressure value in the drive unit 1. The first safety valve 1082 overflows towards the second main pipeline 107. That is, when fluid exits from the first port, the first main pipeline 106 is under high pressure. When the pressure in the first main pipeline 106 exceeds the opening pressure of the overflow valve, some of the hydraulic oil in the first main pipeline 106 will flow back to the second main pipeline 107 via the first safety line 1081 and the first safety valve 1082, achieving internal circulation. Similarly, when fluid exits from the second port, the second main pipeline 107 is under high pressure. When the hydraulic oil pressure in the second main pipeline 107 exceeds the opening pressure of the second safety valve 1084, some of the hydraulic oil in the second main pipeline 107 can flow back to the first main pipeline 106 via the second safety line 1083 and the second safety valve 1084.

[0040] In some implementations, the drive unit 1 further includes a first buffer pipe 109, a second buffer pipe 111, a first valve 110, and a second valve 112. The first buffer pipe 109 connects the buffer tank 104 and the first main pipe 106. The first valve 110 is provided on the first buffer pipe 109 to control the opening or closing of the first buffer pipe 109. The second buffer pipe 111 connects the buffer tank 104 and the second main pipe 107. The second valve 112 is provided on the second buffer pipe 111 to control the opening or closing of the second buffer pipe 111. The first valve 110 and the second valve 112 are electrically connected to the first controller 105. When liquid is discharged from the first port, the first controller 105 controls the first valve 110 to close and the second valve 112 to open. When liquid is discharged from the second port, the first controller 105 controls the first valve 110 to open and the second valve 112 to close.

[0041] The electro-hydraulic system based on distributed electric drive in this embodiment further realizes the bidirectional auxiliary function of the buffer tank 104. That is, when liquid is discharged from the first port and the first main pipeline 106 acts as a high-pressure output pipeline, the rodless chamber 1032 is filled with hydraulic oil, the rod chamber 1031 outputs hydraulic oil, and the telescopic rod is in the extended state. However, the amount of hydraulic oil output by the rod chamber 1031 is less than the amount of hydraulic oil filled by the rodless chamber 1032. At this time, the first controller 105 controls the first valve 110 to close and the second valve 112 to open, that is, the buffer tank 104 is connected to the second main pipeline 107, so that the hydraulic pump 102 can output to the maximum extent, and a portion of the hydraulic oil is output from the buffer tank 104 into the second main pipeline 107 to compensate for the less flow rate of the rod chamber 1031 compared to the rodless chamber 1032. Similarly, when the second main pipeline 107 is used as a high-pressure output pipeline, the first controller 105 controls the first valve 110 to open and the second valve 112 to close. The buffer tank 104 is connected to the first main pipeline 106, and excess hydraulic oil in the first main pipeline 106 can flow back into the buffer tank 104.

[0042] In this way, the buffer tank 104 only acts on the return line of the hydraulic pump 102 each time, avoiding the negative pressure and air suction in the hydraulic pump 102, and realizing the circulation of hydraulic oil in the entire drive unit 1.

[0043] In some embodiments, the drive unit 1 further includes a speed sensor 113, a first pressure sensor 114, a second pressure sensor 115, and a displacement sensor 116. The speed sensor 113 is disposed on the motor 101 and electrically connected to the first controller 105, and is used to feed back the rotational speed information of the motor 101 to the first controller 105. The first pressure sensor 114 is disposed on the first main pipeline 106 and electrically connected to the first controller 105, and is used to feed back the pressure value information of the first main pipeline 106 to the first controller 105. The second pressure sensor 115 is disposed on the second main pipeline 107 and electrically connected to the first controller 105, and is used to feed back the pressure value information of the second main pipeline 107 to the first controller 105. The displacement sensor 116 is disposed on the piston rod of the hydraulic cylinder 103 and electrically connected to the first controller 105, and is used to feed back the displacement information of the piston rod to the first controller 105.

[0044] In this embodiment of the electro-hydraulic system based on distributed electric drive, the first controller 105 can read multiple data sources throughout the entire distributed electric drive electro-hydraulic system, as well as displacement and speed commands from the previous level. Based on the commands from the previous level, the first controller 105 precisely controls the direction and speed of the motor 101, and uses the motor 101 to drive the hydraulic pump 102, which in turn drives the hydraulic cylinder 103, ultimately achieving precise displacement of the telescopic rod in the hydraulic cylinder 103. Throughout the control process, the first controller 105 reads information from the speed sensor 113, the first pressure sensor 114, the second pressure sensor 115, and the displacement sensor 116 in real time, adjusting the speed of the motor 101 accordingly. After integrating the feedback information, the first controller 105 performs closed-loop control, thereby achieving precise control of the telescopic rod's position and pressure.

[0045] In some embodiments, the electro-hydraulic system based on distributed electric drive further includes a power module 2 and a central controller 3. The power module 2 is electrically connected to a plurality of first controllers 105 and supplies power to the plurality of first controllers 105. The central controller 3 is connected to the plurality of first controllers 105 and is used to read feedback information from the plurality of first controllers 105 and control the plurality of first controllers 105.

[0046] In this embodiment, based on a distributed electric drive electro-hydraulic system, drive unit 1 is a sub-drive unit that can be distributed. The first controller 105, acting as a local controller within drive unit 1, executes simple control commands to ensure precise displacement operation of drive unit 1, ensuring safety, reliability, and a low failure rate. The central controller 3, as the controller of the entire system, is responsible for regulating multiple drive units 1, promptly issuing data such as displacement, desired speed, and desired force to them, achieving the expected linkage between multiple drive units 1. The central controller 3 and the first controller 105 are interconnected, forming a distributed control network. This distributed approach makes the entire system more stable.

[0047] In this embodiment, the power module 2 is based on a distributed electric drive electro-hydraulic system, which uses grid power and a backup power source. The backup power source is a supercapacitor or a lithium battery, which is used to provide emergency power to the entire drive unit 1 when the grid power supply is interrupted, so as to complete at least one safety action.

[0048] In some specific embodiments, multiple drive units 1 can be connected to each other, so that when any one drive unit 1 fails, the power of the hydraulic pump of the other drive units 1 can be called for emergency operation.

[0049] The following describes a hydraulic support according to an embodiment of the invention, including a hydraulic actuator and an electro-hydraulic system based on distributed electric drive according to an embodiment of the invention.

[0050] The hydraulic actuators include at least some of the following: column jacks, push jacks, balance jacks, front beam jacks, side push jacks, side guard jacks, telescopic beam jacks, tail beam jacks, insert plate jacks, bottom lifting jacks, pull-back sliding jacks, and anti-tipping and anti-slip jacks. The distributed electric drive-based electro-hydraulic system is the distributed electric drive-based electro-hydraulic system of this embodiment of the invention.

[0051] At least some of the hydraulic actuators are connected to the hydraulic pump 102 in the distributed electric drive-based electro-hydraulic system.

[0052] In some embodiments, at least a portion of the hydraulic actuators are hydraulic cylinders 103 based on a distributed electric drive electro-hydraulic system.

[0053] In this embodiment of the hydraulic support, the traditional jacks in the hydraulic bay are controlled and driven by the electro-hydraulic system based on distributed electric drive of any of the above embodiments, or the hydraulic cylinder 103 in any of the above embodiments' electro-hydraulic systems based on distributed electric drive is used to replace the jacks. This method avoids the traditional hydraulic support's use of centralized pump stations and complex pipelines, and the electric drive approach allows for greater intelligence and precise control. In particular, multiple hydraulic supports can achieve millisecond-level synchronous movement.

[0054] In some embodiments, the side support jack includes a first side support jack 4, a second side support jack 5, and a third side support jack 6. The first side support jack 4, the second side support jack 5, and the third side support jack 6 each employ a drive unit 1 and a hydraulic cylinder 103 in the drive unit 1.

[0055] In the hydraulic support of this embodiment, the first side support jack 4, the second side support jack 5, and the third side support jack 6 drive the first-stage, second-stage, and third-stage side supports to move, respectively. The first side support jack 4, the second side support jack 5, and the third side support jack 6 are all driven by drive units 1 in a distributed electric drive-based electro-hydraulic system, and each drive unit 1 uses a hydraulic cylinder 103 instead of the original jacks. The three drive units 1 work together to achieve smooth, rapid, and precise extension and retraction of the side support plates, completely solving the problems of asynchronous movement and jamming under traditional hydraulic drives.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An electro-hydraulic system based on distributed electric drive, characterized in that, Includes a drive unit (1), the drive unit (1) comprising: Motor (101); A hydraulic pump (102) is connected to a motor (101) so that the motor (101) drives the hydraulic pump (102) to rotate. The hydraulic pump (102) has a first interface and a second interface, wherein liquid enters at one of the first interface and the second interface and liquid exits at the other. The hydraulic cylinder (103) includes a rod chamber (1031) and a rodless chamber (1032). The first interface is connected to the rod chamber (1031), and the second interface is connected to the rodless chamber (1032). A buffer tank (104) is disposed between the first interface and the rod chamber (1031) or between the second interface and the rodless chamber (1032) to compensate for the flow difference between the rod chamber (1031) and the rodless chamber (1032); A first controller (105) is connected to the motor (101) for supplying power to the motor (101) and controlling the motor (101). The first main pipeline (106) is used to connect the first interface with the rod cavity (1031). The second main pipeline (107) is used to connect the second interface to the rodless cavity (1032). A safety component (108) is disposed between the first main pipeline (106) and the second main pipeline (107) and has a safety pressure value. The safety component (108) is used to allow the medium to flow to the other pipeline when the pressure value of the medium in either the first main pipeline (106) or the second main pipeline (107) exceeds the safety pressure value. The security component (108) includes: The first safety pipeline (1081) is located between the first main pipeline (106) and the second main pipeline (107); The first safety valve (1082) is installed on the first safety pipeline (1081). The first safety valve (1082) is used to allow the medium in the first main pipeline (106) to flow towards the second main pipeline (107) through the first safety pipeline (1081) and the first safety valve (1082) when the pressure value of the first main pipeline (106) exceeds the safety pressure value. The second safety pipeline (1083) is located between the first main pipeline (106) and the second main pipeline (107); The second safety valve (1084) is installed on the second safety pipeline (1083). The second safety valve (1084) is used to allow the medium in the second main pipeline (107) to flow towards the first main pipeline (106) through the second safety pipeline (1083) and the second safety valve (1084) when the pressure value of the second main pipeline (107) exceeds the safety pressure value. The drive unit (1) further includes a first buffer pipeline (109), a second buffer pipeline (111), a first valve (110), and a second valve (112). The first buffer pipeline (109) connects the buffer tank (104) and the first main pipeline (106). The first valve (110) is provided on the first buffer pipeline (109) to control the opening or closing of the first buffer pipeline (109). The second buffer pipeline (111) connects the buffer tank (104) and the second main pipeline (107). The second valve (112) is provided on the second buffer pipeline (111) to control the opening or closing of the second buffer pipeline (111). The first valve (110) and the second valve (112) are electrically connected to the first controller (105). When liquid is discharged from the first interface, the first controller (105) controls the first valve (110) to close and the second valve (112) to open. When liquid is discharged from the second interface, the first controller (105) controls the first valve (110) to open and the second valve (112) to close.

2. The electro-hydraulic system based on distributed electric drive according to claim 1, characterized in that, Both the first safety valve (1082) and the second safety valve (1084) are relief valves. The inlet of the first safety valve (1082) is connected to the first main pipeline (106), and the outlet of the first safety valve (1082) is connected to the second main pipeline (107). The inlet of the second safety valve (1084) is connected to the second main pipeline (107), and the outlet of the second safety valve (1084) is connected to the first main pipeline (106).

3. The electro-hydraulic system based on distributed electric drive according to claim 1, characterized in that, The drive unit (1) further includes: A speed sensor (113) is mounted on the motor (101) and electrically connected to the first controller (105). The speed sensor (113) is used to feed back the rotational speed information of the motor (101) to the first controller (105). The first pressure sensor (114) is located on the first main pipeline (106) and electrically connected to the first controller (105). The first pressure sensor (114) is used to feed back the pressure value information of the first main pipeline (106) to the first controller (105). The second pressure sensor (115) is located on the second main pipeline (107) and electrically connected to the first controller (105). The second pressure sensor (115) is used to feed back the pressure value information of the second main pipeline (107) to the first controller (105). A displacement sensor (116) is disposed on the piston rod of the hydraulic cylinder (103) and electrically connected to the first controller (105). The displacement sensor (116) is used to feed back the displacement information of the piston rod to the first controller (105).

4. The electro-hydraulic system based on distributed electric drive according to claim 3, characterized in that, The hydraulic pump (102) is a bidirectional hydraulic pump; And / or, the buffer tank (104) is filled with a medium and the buffer tank (104) is pressurized; And / or, there are multiple drive units (1), and the multiple drive units (1) can be arranged in a distributed manner.

5. The electro-hydraulic system based on distributed electric drive according to any one of claims 1-4, characterized in that, Also includes: A power module (2) is electrically connected to and supplies power to a plurality of the first controllers (105); A central controller (3) is connected to a plurality of first controllers (105) and is used to read feedback information from the plurality of first controllers (105) and control the plurality of first controllers (105).

6. A hydraulic support, characterized in that, include: The hydraulic actuator includes at least a portion of the following: column jack, push jack, balance jack, front beam jack, side push jack, side guard jack, telescopic beam jack, tail beam jack, insert plate jack, bottom lifting jack, pull-back sliding jack, and anti-tipping and anti-slip jack. An electro-hydraulic system based on distributed electric drive, wherein the electro-hydraulic system based on distributed electric drive is any one of the electro-hydraulic systems based on distributed electric drive as described in any one of claims 1-5; At least a portion of the hydraulic actuators are connected to the hydraulic pump (102) in the electro-hydraulic system based on distributed electric drive; And / or, at least some of the hydraulic actuators are hydraulic cylinders (103) of the electro-hydraulic system based on distributed electric drive.

7. The hydraulic support according to claim 6, characterized in that, The side support jacks include a first side support jack (4), a second side support jack (5), and a third side support jack (6). The first side support jack (4), the second side support jack (5), and the third side support jack (6) each adopt a drive unit (1) and a hydraulic cylinder (103) in the drive unit (1).

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