Actuator system and working machine

Abstract

The utility model provides an actuator system and an operation machine, and belongs to the technical field of engineering machines. The actuator system is applied to the operation machine, the operation machine comprises an arm frame, and the actuator system comprises an electro-hydrostatic actuator, a hydraulic cylinder, a hydraulic cylinder and a hydraulic cylinder, the first power supply module is arranged on the arm support, and the first power supply module is connected with the electro-hydrostatic actuator and used for supplying power to the electro-hydrostatic actuator; a power cable; and the second power supply module is arranged below the cantilever crane, is connected with the first power supply module through a power cable, and is used for supplying power to the first power supply module. Driving control of the far end of the actuator is achieved in an electric driving and liquid transmission mode, a pipeline and a hose winding drum are omitted, and the failure rate is reduced. According to the electro-hydrostatic actuator, the power supply of the electro-hydrostatic actuator can be longer and more stable, the electro-hydrostatic actuator can work more stably, the working time is longer, and the reliability and the cruising ability of an actuator system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, and particularly relates to an actuator system and a construction machine. Background Art

[0002] Construction machinery realizes remote control operation by controlling the movement of an actuator. For example, an engineering crane performs remote lifting through a jib luffing device, and the lifting distance can be extended by adjusting the jib luffing angle. For a conventional actuator, its power source is taken from the host hydraulic system, and the retraction and extension of the hydraulic transmission pipeline at nearly a hundred meters above the ground are realized through a hose reel. However, when the power source drives the actuator through a long hydraulic pipeline over a long distance, the system response is slow, the pressure loss is large, and at the same time, a hose reel is required to retract and extend the hydraulic pipeline. The hose reel mechanism is complex, costly, difficult to disassemble and assemble, and prone to phenomena such as spring failure and hose wear, resulting in low reliability of the actuator system. Summary of the Utility Model

[0003] The purpose of the embodiments of the utility model is to provide an actuator system and a construction machine. The actuator system realizes the drive control of the actuator at the remote end in an electro-hydrostatic transmission manner, cancels the pipeline and the hose reel, reduces the failure rate, improves the system response, and enhances the reliability of the system.

[0004] To achieve the above purpose, the first aspect of the present application provides an actuator system applied to a construction machine. The construction machine includes a boom, and the actuator system includes:

[0005] An electro-hydrostatic actuator disposed on the boom;

[0006] A first power module disposed on the boom, connected to the electro-hydrostatic actuator, and used to supply power to the electro-hydrostatic actuator;

[0007] A power cable;

[0008] A second power module disposed below the boom, connected to the first power module through the power cable, and used to supply power to the first power module.

[0009] In the embodiments of the present application, the first power module includes a charger and an energy storage unit. The input end of the charger is connected to the power cable, the output end of the charger is connected to the input end of the energy storage unit, and the output end of the energy storage unit is connected to the electro-hydrostatic actuator.

[0010] In an embodiment of the present application, the second power supply module includes: an inverter and a storage battery. The output end of the storage battery is connected to the input end of the inverter, and the output end of the inverter is connected to the first power supply module through the power cable.

[0011] In an embodiment of the present application, the second power supply module further includes a booster. The input end of the booster is connected to the output end of the inverter, and the output end of the booster is connected to the power cable.

[0012] In an embodiment of the present application, the actuator system further includes a generator and an engine. The input end of the generator is connected to the engine, and the output end of the generator is connected to the storage battery.

[0013] In an embodiment of the present application, a power cable reel is further included, and the power cable is wound on the power cable reel.

[0014] In an embodiment of the present application, there are multiple electro-hydrostatic actuators, and the first power supply module is respectively connected to the electro-hydrostatic actuators.

[0015] In an embodiment of the present application, the electro-hydrostatic actuator includes:

[0016] A hydraulic actuator, which includes a first hydraulic chamber and a second hydraulic chamber;

[0017] A balance valve, which includes a first oil port, a second oil port, and a control end. The control end is used to control the balance valve to work in a first state or a second state. In the first state, the first oil port conducts unidirectionally to the second oil port. In the second state, proportional throttling occurs between the first oil port and the second oil port;

[0018] A motor pump,

[0019] The first end of the motor pump is connected to the first oil port, the second end of the motor pump is connected to the first hydraulic chamber, the second oil port is connected to the second hydraulic chamber, and the first power supply module is connected to the motor pump.

[0020] The second aspect of the present application provides a working machine, including:

[0021] A boom;

[0022] The actuator system as described above, where the electro-hydrostatic actuator and the first power supply module in the actuator system are arranged on the boom.

[0023] In an embodiment of the present application, it further includes: a vehicle body, and the second power supply module of the actuator system is arranged on the vehicle body.

[0024] Through the above technical solution, by setting an electro-hydrostatic actuator on the boom, the remote drive control of the actuator on the boom can be achieved in an electro-driven and hydraulic-transmission manner. The first power module supplies power to the electro-hydrostatic actuator, and the first power module is connected to the second power module through a power cable to supply power to the electro-hydrostatic actuator, eliminating the pipeline and hose reel, reducing the failure rate, and improving the system response. Both the electro-hydrostatic actuator and the first power module are arranged on the boom, and the second power module is arranged under the boom. The second power module can continuously and stably supply power to the first power module through the power cable, ensuring sufficient electric energy in the first power module, thereby ensuring the normal movement of the electro-hydrostatic actuator. In addition, it can also make the power supply of the electro-hydrostatic actuator longer and more stable, enabling the electro-hydrostatic actuator to work more stably and for a longer time, improving the reliability and endurance of the actuator system.

[0025] Other features and advantages of the embodiments of the present utility model will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0026] The drawings are used to provide a further understanding of the embodiments of the present utility model, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the embodiments of the present utility model, but do not constitute a limitation to the embodiments of the present utility model. In the drawings:

[0027] Figure 1 Schematically shows the schematic diagram of the auxiliary boom luffing system according to the embodiment of the present application.

[0028] Description of the Reference Numerals in the Drawings

[0029] 100 - electro-hydrostatic actuator; 200 - first power module; 300 - second power module; 1-1 - first luffing cylinder; 1-2 - second luffing cylinder; 2-1 - first pressure sensor; 2-2 - second pressure sensor; 2-3 - third pressure sensor; 2-4 - fourth pressure sensor; 3-1 - first accumulator; 3-2 - second accumulator; 4-1 - first hydraulic check valve; 4-2 - second hydraulic check valve; 4-3 - third hydraulic check valve; 4-4 - fourth hydraulic check valve; 5-1 - first fixed-displacement pump; 5-2 - second fixed-displacement pump; 6-1 - first motor; 6-2 - second motor; 7-1 - first relief valve; 7-2 - second relief valve; 7-3 - third relief valve; 7-4 - fourth relief valve; 8-1 - first normally open solenoid valve; 8-2 - second normally open solenoid valve; 9-1 - first balance valve; 9-2 - second balance valve. Detailed Description of the Embodiments

[0030] The following will describe in detail the specific implementation manners of the embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and understanding the embodiments of the present utility model, and are not used to limit the embodiments of the present utility model.

[0031] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present application, such descriptions of "first", "second", etc. are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0032] Please refer to Figure 1 , Figure 1 , which schematically shows the schematic diagram of the auxiliary boom luffing system according to the embodiments of the present application. This embodiment provides an actuator system, which can be used for remote operations of various construction machinery. For example, it is used for the auxiliary boom luffing of a crane. This actuator system cancels the hose reel and hoses. By setting the electro-hydrostatic actuator 100, the drive control of the actuator at the remote end is realized in an electro-driven and hydraulic-transmitted manner. The first power module 200 supplies power to the electro-hydrostatic actuator 100. The first power module 200 is connected to the second power module 300 through a power cable, thereby realizing power supply to the actuator, reducing the failure rate, and improving the system response.

[0033] This embodiment provides an actuator system, which is applied to a working machine. The working machine includes a boom. The actuator system includes:

[0034] An electro-hydrostatic actuator 100, which is arranged on the boom;

[0035] A first power module 200, which is arranged on the boom. The first power module 200 is connected to the electro-hydrostatic actuator 100 and is used to supply power to the electro-hydrostatic actuator;

[0036] A power cable;

[0037] A second power module 300, which is arranged below the boom. The second power module 300 is connected to the first power module 200 through the power cable and is used to supply power to the first power module 200.

[0038] Through the above technical solution, by setting up the electro-hydrostatic actuator 100, the drive control of the distal end of the actuator is realized in the way of electric drive and hydraulic transmission. The first power module 200 outputs high-voltage power to the electro-hydrostatic actuator 100. The first power module 200 is connected to the second power module 300 through a power cable to supply power to the electro-hydrostatic actuator 100. The transmission of the power source cancels the pipeline and hose reel, reduces the failure rate, and improves the system response. By arranging both the electro-hydrostatic actuator 100 and the first power module 200 on the boom, and the second power module 300 is arranged under the boom, the electro-hydrostatic actuator 100 can be quickly and stably powered, ensuring the normal movement of the electro-hydrostatic actuator 100. By setting up the first power module 200 and the second power module 300, the first power module 200 supplies power to the electro-hydrostatic actuator, and the second power module 300 supplies power to the first power module 200, so that the power supply of the electro-hydrostatic actuator can be longer and more stable, making the electro-hydrostatic actuator work more stably and for a longer time, and improving the reliability and endurance of the actuator system.

[0039] In this embodiment, the above-mentioned electro-hydrostatic actuator 100 is an actuator that highly integrates a motor, a pump, a hydraulic valve, a fuel tank, and a hydraulic cylinder, and controls the hydraulic cylinder through the volume speed regulation of the motor pump. The above-mentioned power cable is used to transmit current to the first power module 200, and the first power module 200 supplies high-voltage power to the electro-hydrostatic actuator 100.

[0040] It should be noted that the above-mentioned second power module 300 is located below the boom. The position below the boom mentioned here can refer to the position below the boom. In a working machine with a vehicle body, the position below the boom can also be on the chassis or underframe of the vehicle body located below the boom.

[0041] In this embodiment, the output of the above-mentioned second power module 300 can be low voltage or high voltage.

[0042] Among them, when the output of the second power module 300 is low voltage, the first power module 200 can boost the voltage and then supply power to the electro-hydrostatic actuator. The second power module 300 transmits the low-voltage power to the first power module 200 through a power cable, so that long-distance low-power DC power transmission can be realized, the heat generation and external radiation electromagnetic interference during power transmission can be reduced, and the safety hazards of high-voltage power transmission can be reduced.

[0043] When the output of the second power module 300 is high voltage, the first power module 200 can directly supply power to the electro-hydrostatic actuator. The second power module 300 transmits the high-voltage power to the first power module 200 through a power cable. Compared with transmitting the low-voltage power to the first power module 200 through a power cable, the diameter of the power cable can be reduced, and the cost can be saved.

[0044] In some embodiments, the first power supply module 200 includes: a charger and an energy storage unit. The input end of the charger is connected to the power cable, the output end of the charger is connected to the input end of the energy storage unit, and the output end of the energy storage unit is connected to the electro-hydrostatic actuator 100.

[0045] In this embodiment, the above-mentioned energy storage unit refers to a device that can be used as a backup power supply or an energy storage device to maintain the normal operation of the system in case of unstable or interrupted power supply, including components such as batteries and supercapacitors. The above-mentioned charger refers to a device used to charge equipment.

[0046] The energy storage unit and the charger can be used to replenish the energy of the first power supply module 200, achieve the balance and utilization of electric energy, and improve the electric energy utilization rate and the stability of the system. Connecting the input end of the charger to the power cable and the output end of the charger to the input end of the energy storage unit can achieve energy replenishment without disassembling the energy storage unit, which is convenient for operation.

[0047] In some embodiments, the second power supply module 300 includes: an inverter and a storage battery. The output end of the storage battery is connected to the input end of the inverter, and the output end of the inverter is connected to the first power supply module 200 through the power cable.

[0048] In this embodiment, the output of the above-mentioned storage battery is a DC power supply, and the inverter is used to convert the DC power supply into an AC power supply for convenient transmission through the power cable to reduce power transmission losses. It should be noted that the above-mentioned second power supply module 300 can also be a power battery.

[0049] In some embodiments, the second power supply module 300 further includes a booster. The input end of the booster is connected to the output end of the inverter, and the output end of the booster is connected to the power cable.

[0050] In this embodiment, the above-mentioned booster can be a step-up transformer used to boost the AC power supply. The above-mentioned booster can be arranged under the boom, such as on the vehicle body, to transmit the high-voltage power supply to the first power supply module 200 through the power cable, thereby reducing voltage drop and losses, enabling the AC power to be transmitted over a longer distance for long-distance power transmission.

[0051] It should be noted that the above-mentioned booster can also be arranged on the boom. For example, it can be arranged in the charger. The second power module 300 transmits low-voltage current to the charger through a power cable. The charger can convert the low-voltage current into high-voltage current and input it into the energy storage unit for storage. The energy storage unit supplies high-voltage power to the electro-hydrostatic actuator 100, thereby realizing low-voltage charging and high-voltage power supply, achieving long-distance low-power power transmission, reducing heat generation and electromagnetic interference of external radiation during power transmission, and reducing the safety hazards of high-voltage charging.

[0052] In some embodiments, the actuator system further includes a generator and an engine. The input end of the generator is connected to the engine, and the output end of the generator is connected to the battery.

[0053] In this embodiment, the combination of the generator and the engine can convert kinetic energy into electrical energy, thereby realizing green power generation. The generator outputs an AC power supply to charge the battery, thereby ensuring power supply stability. For fuel-powered construction machinery, the generator and the engine can cooperate to provide power, thereby solving the problems of long-distance charging and power supply.

[0054] In some embodiments, it further includes a power cable reel, and the power cable is wound on the power cable reel.

[0055] In this embodiment, the above-mentioned power cable reel can retract and extend the power cable to meet the needs of different scenarios. The power cable can also share the power cable reel with the weak wire harness, further reducing the cost.

[0056] In some embodiments, there are multiple electro-hydrostatic actuators 100, and the first power module 200 is respectively connected to the electro-hydrostatic actuators 100.

[0057] In this embodiment, the power units of each electro-hydrostatic actuator 100 are all connected to the first power module 200. By setting multiple electro-hydrostatic actuators 100, the operation efficiency and stability can be improved.

[0058] In some embodiments, the electro-hydrostatic actuator 100 includes:

[0059] A hydraulic actuator, which includes a first hydraulic chamber and a second hydraulic chamber;

[0060] A balance valve, which includes a first oil port, a second oil port and a control end. The control end is used to control the balance valve to work in a first state or a second state. In the first state, the first oil port to the second oil port conducts unidirectionally. In the second state, there is proportional throttling between the first oil port and the second oil port;

[0061] A motor pump,

[0062] The first end of the motor pump is connected to the first oil port, the second end of the motor pump is connected to the first hydraulic chamber, the second oil port is connected to the second hydraulic chamber, and the first power supply module 200 is connected to the motor pump.

[0063] In this embodiment, the above-mentioned hydraulic actuator can be a hydraulic motor, a hydraulic cylinder, etc. The motor pump is used to convert power into fluid pressure or flow. The pump is driven by an electric motor to operate, and the pump transports the fluid from one position to another. The motor pump includes: a hydraulic pump, and an electric motor connected to the hydraulic pump. The electric motor drives the hydraulic pump to suck and discharge oil, and the oil suction and discharge of the hydraulic pump are controlled by adjusting the motor speed. The above-mentioned hydraulic pump is a two-way hydraulic pump, and the two-way hydraulic pump can be a fixed-displacement pump or a two-way variable-displacement pump. The two-way variable-displacement pump controls the system flow through a dual-variable control system of speed and displacement, breaks the limitation of the minimum speed of the fixed-displacement pump, and can further improve the speed regulation range.

[0064] It should be noted that the control end of the above-mentioned balance valve can be controlled electrically or hydraulically. The structure of the balance valve can be a single-spool structure or a multi-spool structure, which is not limited in this embodiment.

[0065] By controlling the control end of the balance valve, when the balance valve works in the first state, the hydraulic oil flows into the first oil port through the first end of the motor pump, flows into the second hydraulic chamber from the second oil port, pushes the hydraulic actuator to move, and the hydraulic oil in the first hydraulic chamber flows into the second end of the motor pump; by controlling the control end of the balance valve, when the balance valve works in the second state, the hydraulic oil in the second hydraulic chamber flows into the motor pump through the balance valve. The system flow is adjusted by controlling the motor pump speed to achieve speed regulation when the balance valve works in the first state. By adjusting the control pressure and valve opening of the balance valve, speed regulation when the balance valve works in the second state is achieved, so that stepless speed regulation of the hydraulic actuator can be realized.

[0066] By setting the balance valve, the flow rate of the liquid can be accurately controlled, so as to achieve precise speed control. By controlling the speed with the balance valve, the liquid flow in the system can be made more stable, the system fluctuations can be reduced, and the operation stability and reliability of the system can be improved. The motor pump has a wide speed regulation range, flexible adjustment of rotational speed acceleration, and is easy to achieve smooth and fine movement control. By adopting the motor pump and the balance valve, closed-loop motor pump volume speed regulation is realized, which helps to achieve stable control of the direction and speed of the hydraulic actuator.

[0067] In some embodiments, the number of the motor pumps is multiple, one motor pump is correspondingly connected to one or more hydraulic actuators, and each motor pump is connected to the first power supply module 200.

[0068] In this embodiment, the above-mentioned motor pump can control one hydraulic actuator, or it can control multiple hydraulic actuators. Controlling one hydraulic actuator with one motor pump makes the control more flexible. Controlling multiple hydraulic actuators with one motor pump can improve the control efficiency and save costs.

[0069] To facilitate the description of the solution, take two electro-hydrostatic actuators 100 as an example below, and use the auxiliary boom luffing system of a crane to illustrate the solution. Please refer to Figure 1 , Figure 1 which schematically shows the schematic diagram of the auxiliary boom luffing system according to the embodiment of the present application. It should be noted that the A chamber mentioned below is the rodless chamber in the luffing cylinder in the figure, and the B chamber is the rod chamber in the luffing cylinder in the figure.

[0070] The first motor and the second motor in the two electro-hydrostatic actuators 100 are both connected to the energy storage unit, and the energy storage unit supplies power to the first motor and the second motor respectively to ensure the normal operation of the electro-hydrostatic actuator 100. The above-mentioned energy storage unit is connected to the charger, takes power from the lower vehicle engine to generate electricity, the generator is connected to the engine power take-off shaft, and is transmitted to the charger through the power cable on the power cable reel. The charger converts the current into a low-voltage direct current and outputs it to charge the energy storage unit.

[0071] The balance valve corresponding to the first luffing cylinder 1-1 in one of the electro-hydrostatic actuators 100 is the first balance valve 9-1, and the corresponding motor pump includes the first motor 6-1 and the first fixed displacement pump 5-1; it also includes: the first hydraulic check valve 4-1, the second hydraulic check valve 4-2, the first overflow valve 7-1, the second overflow valve 7-2 and the first accumulator 3-1. The balance valve corresponding to the second luffing cylinder 1-2 in the other electro-hydrostatic actuator 100 is the second balance valve 9-2, and the corresponding motor pump includes the second motor 6-2 and the second fixed displacement pump 5-2; it also includes: the third hydraulic check valve 4-3, the fourth hydraulic check valve 4-4, the third overflow valve 7-3, the fourth overflow valve 7-4 and the second accumulator 3-2.

[0072] Among them, the first motor 6-1 is connected to the first fixed displacement pump 5-1 to drive the first fixed displacement pump 5-1 to rotate. The L end of the first fixed displacement pump 5-1 is respectively connected to the one-way conduction end A port of the first balance valve 9-1. The one-way cut-off end B port of the first balance valve 9-1 is connected to the A chamber of the first luffing cylinder 1-1. The R end of the first fixed displacement pump 5-1 is connected to the control port X of the first balance valve 9-1 and the B chamber of the first luffing cylinder 1-1. The first overflow valve 7-1 and the second overflow valve 7-2 are respectively connected to the L end and the R end of the first fixed displacement pump 5-1. The one-way cut-off ends of the third hydraulic check valve 4-3 and the fourth hydraulic check valve 4-4 are connected between the overflow valve and the balance valve, and the one-way conduction ends are connected to each other and connected to the first accumulator 3-1.

[0073] Among them, the second motor 6-2 is connected to the second fixed-displacement pump 5-2 to drive the second fixed-displacement pump 5-2 to rotate. The L end of the second fixed-displacement pump 5-2 is respectively connected to the one-way conduction end A port of the second balance valve 9-2. The one-way cut-off end B port of the second balance valve 9-2 is connected to the A chamber of the second luffing cylinder 1-2. The R end of the second fixed-displacement pump 5-2 is connected to the control port X of the second balance valve 9-2 and the B chamber of the second luffing cylinder 1-2. The third overflow valve 7-3 and the fourth overflow valve 7-4 are respectively connected to the L end and the R end of the second fixed-displacement pump 5-2. The one-way cut-off ends of the third hydraulic check valve 4-3 and the fourth hydraulic check valve 4-4 are connected between the overflow valve and the balance valve, and the one-way conduction ends are connected to each other and connected to the second accumulator 3-2.

[0074] The normally open end of the first normally open electromagnetic solenoid valve 8-1 is connected to the first accumulator 3-1 and the control port X of the first balance valve 9-1. The normally open end of the second normally open electromagnetic solenoid valve 8-2 is connected to the second accumulator 3-2 and the control port X of the second balance valve 9-2.

[0075] In some embodiments, pressure sensors are respectively arranged in the first hydraulic chamber and the second hydraulic chamber.

[0076] In this embodiment, please refer to Figure 1 , the first pressure sensor 2-1 and the fourth pressure sensor 2-4 are respectively connected to the A chambers of the first luffing cylinder 1-1 and the second luffing cylinder 1-2. The second pressure sensor 2-2 and the third pressure sensor 2-3 are respectively connected to the B chambers of the first luffing cylinder 1-1 and the second luffing cylinder 1-2. The pressure sensors further monitor the synchronism and off-loading conditions of the luffing cylinders by monitoring the pressures in the two chambers of the luffing cylinders. When the pressure difference between the first luffing cylinder 1-1 and the second luffing cylinder 1-2 exceeds the threshold during the luffing process, the luffing is stopped and an alarm is sent to the host machine.

[0077] By respectively arranging pressure sensors in the first hydraulic chamber and the second hydraulic chamber, the pressures in the two chambers of the luffing cylinders can be monitored, and the synchronism and off-loading conditions of the luffing cylinders can be further monitored, which helps the normal operation.

[0078] This embodiment also provides a working machine, including:

[0079] A boom;

[0080] The actuator system as described above, and the electro-hydrostatic actuator 100 and the first power module 200 in the actuator system are arranged on the boom.

[0081] The above-mentioned working machine can be a crane, a concrete pump truck, an excavator, a fire truck, an agricultural machine or a boom-type working robot, etc.

[0082] In this embodiment, the working machine can be a fuel vehicle, including components such as an engine, a generator, and a storage battery, and these components can serve as the second power supply module 300 in the electro-hydrostatic actuator 100. The working machine can also be a new energy working machine, including a power battery, such as a lithium battery or a fuel cell, etc., for storing and releasing electric energy for various electric devices to use, and the power battery can serve as the second power supply module 300 in the electro-hydrostatic actuator 100.

[0083] Taking the working machine as a crane as an example, the above electro-hydrostatic actuator 100 system can be used for the luffing of the jib. The electro-hydrostatic actuator 100 and the first power supply module 200 are both arranged on the jib. By setting the electro-hydrostatic actuator 100, the drive control of the distal end of the actuator is realized in an electro-driven and hydraulic-transmitted manner. The first power supply module 200 is connected to the second power supply module 300 through a power cable to supply power to the electro-hydrostatic actuator 100, canceling the pipeline and the hose reel, and reducing the failure rate. By arranging the electro-hydrostatic actuator 100 and the first power supply module 200 on the boom, and the second power supply module 300 under the boom, power can be supplied to the electro-hydrostatic actuator 100 quickly and stably, ensuring the normal movement of the electro-hydrostatic actuator 100. By setting the first power supply module 200 and the second power supply module 300, the first power supply module 200 supplies power to the electro-hydrostatic actuator, and the second power supply module 300 supplies power to the first power supply module 200, so that the power supply of the electro-hydrostatic actuator can be longer and more stable, making the electro-hydrostatic actuator work more stably and for a longer time, improving the reliability and endurance of the actuator system, and thus making the working machine work more stably and reliably, and improving the working efficiency.

[0084] Wherein, it further includes: a vehicle body, and the second power supply module 300 of the actuator system is arranged on the vehicle body.

[0085] In this embodiment, a vehicle engine is arranged on the vehicle body, and the second power supply module 300 of the actuator system generates electricity by taking power from the vehicle engine.

[0086] Taking the working machine as a crane as an example, the above vehicle engine is the lower vehicle engine. The second power supply module 300 includes an inverter, a storage battery, a generator, and the vehicle engine. The generator is connected to the power take-off shaft of the vehicle engine, the generator is connected to the storage battery, the storage battery is connected to the inverter, and the inverter is connected to the power cable. By arranging the generator to generate electricity by taking power from the lower vehicle engine, the current is inverted and output as low-voltage direct current, which is transmitted to the charger at the jib to supply power to the energy storage unit. The system can be continuously charged during the luffing operation interval to meet the power consumption requirements, and the wire harness is wound and unwound through the power cable reel to realize the wire harness winding and unwinding during the boom telescoping process. The power supply wire harness and the weak current wire harness can share the power cable reel, further reducing the cost. This charging solution does not require the disassembly and energy replenishment of the energy storage unit, and can also solve the problems of long-distance charging and power supply of the current fuel-powered crane, reduce the heat generation and electromagnetic interference of external radiation during the power transmission process, and reduce the safety hazards of high-voltage charging.

[0087] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, commodity or device including the element.

[0088] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. An actuator system, applied to a working machine, characterized in that: The working machine comprises a boom, and the actuator system comprises: An electrostatic hydraulic actuator, wherein the electrostatic hydraulic actuator is arranged on the arm support; a first power supply module, wherein the first power supply module is disposed on the arm support and connected to the electrostatic hydraulic actuator to supply power to the electrostatic hydraulic actuator; Power cables; A second power module, wherein the second power module is disposed below the arm, and the second power module is connected to the first power module via the power cable, so as to supply power to the first power module.

2. The actuator system according to claim 1, characterized in that The first power module includes: a charger and an energy storage unit, the input end of the charger is connected to the power cable, the output end of the charger is connected to the input end of the energy storage unit, and the output end of the energy storage unit is connected to the electrostatic hydraulic actuator.

3. The actuator system according to claim 1, characterized in that The second power module includes: an inverter and a battery, the output end of the battery is connected to the input end of the inverter, and the output end of the inverter is connected to the first power module through the power cable.

4. The actuator system according to claim 3, characterized in that The second power supply module further includes a booster, an input end of the booster is connected to an output end of the inverter, and an output end of the booster is connected to the power cable.

5. The actuator system according to claim 3, characterized in that: The actuator system further includes a generator and an engine, wherein an input end of the generator is connected to the engine, and an output end of the generator is connected to the battery.

6. The actuator system according to claim 1, characterized in that It also includes a power cable reel, on which the power cable is wound.

7. The actuator system according to claim 1, characterized in that There are multiple electrostatic hydraulic actuators, and the first power supply modules are connected to the electrostatic hydraulic actuators respectively.

8. The actuator system according to claim 1, characterized in that The electrostatic hydraulic actuator comprises: A hydraulic actuator, the hydraulic actuator comprising a first hydraulic chamber and a second hydraulic chamber; A balancing valve, the balancing valve comprising a first oil port, a second oil port and a control end, the control end being used to control the balancing valve to operate in a first state or a second state, in which the first oil port is unidirectionally connected to the second oil port, and in which the first oil port and the second oil port are proportionally throttled in the second state; Motor pump, The first end of the motor pump is connected to the first oil port, the second end of the motor pump is connected to the first hydraulic chamber, the second oil port is connected to the second hydraulic chamber, and the first power module is connected to the motor pump.

9. A working machine, characterized in that: include: Boom; The actuator system according to any one of claims 1 to 8, wherein the electrostatic hydraulic actuator and the first power module in the actuator system are arranged on the arm.

10. The working machine according to claim 9, characterized in that: Also includes: The vehicle body, the second power supply module of the actuator system is arranged on the vehicle body.

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