An electric sweeper and an electro-hydraulic driving system thereof

Abstract

The application provides an electric cleaning vehicle and an electro-hydraulic driving system thereof, which comprises an upper controller, a driving assembly, a hydraulic assembly, a disc brush driving assembly and a sensor assembly; the sensor assembly is configured to collect a pressure signal of a disc brush lifting cylinder of a hydraulic cylinder of the hydraulic assembly and a displacement feedback signal of the disc brush lifting cylinder of the hydraulic cylinder of the hydraulic assembly in real time; the upper controller is configured to control a motor of the driving assembly according to the pressure signal and the displacement feedback signal to drive the hydraulic assembly to operate at a torque corresponding to a preset motor target torque, so as to realize closed-loop control of displacement of the disc brush lifting cylinder of the hydraulic cylinder of the hydraulic assembly and motor speed and reduce power loss of the hydraulic assembly; meanwhile, the driving assembly is controlled to drive the disc brush driving assembly to rotate at a target speed. In addition, the electro-hydraulic driving system of the existing electric cleaning vehicle cannot avoid missing cleaning and has the problem of excessively high power loss.

Description

Technical Field

[0001] This invention relates to the field of sweeper technology, specifically to an electric sweeper and its electro-hydraulic drive system. Background Technology

[0002] For electric sweepers, the superstructure mainly consists of two parts: the sweeping hydraulic system module and the pneumatic conveying module. Regarding the sweeping hydraulic system module, firstly, because the movement speed and required pressure of each actuator are different, the traditional hydraulic system design uses throttle valves on each actuator branch to adjust the speed of the corresponding hydraulic cylinders, while the working pressure of each actuator is set by the system relief valve to determine the system's maximum working pressure. Secondly, due to the special limitations of the electric sweeper's hydraulic system, the disc brush speed cannot reach high speeds on small equipment, thus making it unsuitable for high-speed sweeping conditions, i.e., cleaning work on highways.

[0003] Finally, during the operation of electric sweepers, the grounding pressure of the disc brush is a crucial factor affecting their working efficiency. Currently, the control of the disc brush grounding pressure is mostly achieved using springs or pressure valves. While using springs can control the grounding pressure of the disc brush to some extent and prevent the brush bristles from wearing out too quickly, its disadvantages are also very obvious: it cannot be properly adjusted, which may lead to frequent missed sweeping situations. On the other hand, using pressure valves to control the disc brush cylinder branch can achieve segmented pressure adjustment, allowing the disc brush grounding pressure to be adjusted in a timely manner according to the working conditions, but at the same time, it will also bring significant energy loss.

[0004] Traditional sweeper hydraulic systems are designed with the actual maximum flow rate required by each actuator as the design value, typically based on the flow rate required for lifting the dust collection box. The pressure of each actuator is also set based on the working pressure required by the dust collection box. Therefore, except for the branch containing the dust collection box lifting cylinder, the actual flow rate and pressure required by other actuators are far less than the hydraulic system's set values. Consequently, each actuator requires a throttle valve to control the speed of its actions, and each actuator experiences a pressure build-up process. This increases the complexity of the hydraulic system on the electric sweeper, raising system costs due to the numerous throttle valves and requiring more time for debugging. Furthermore, the pressure build-up process in the actuator branches (excluding the dust collection box branch) generates a significant amount of wasted energy, accelerating system heating and leading to excessive power loss.

[0005] In view of the above, this application is hereby submitted. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an electric sweeper and its electro-hydraulic drive system, which can effectively solve the problems of the existing electric sweeper's electro-hydraulic drive system being unable to be properly adjusted, frequently resulting in missed sweeping, and also having high system cost and large system energy loss.

[0007] This invention discloses an electro-hydraulic drive system for an electric sweeper, comprising: an upper structure controller, a drive assembly, a hydraulic assembly, a disc brush drive assembly, and a sensor assembly;

[0008] The output terminal of the superstructure controller is electrically connected to the input terminal of the drive assembly, the input terminal of the hydraulic assembly, and the input terminal of the disc brush drive assembly. The input terminal of the superstructure controller is electrically connected to the output terminal of the sensor assembly. The output terminal of the drive assembly is electrically connected to the input terminal of the disc brush drive assembly. The output terminal of the disc brush drive assembly is used to electrically connect to the control terminal of the disc brush cleaning device of the electric sweeper. The drive assembly is connected to the hydraulic assembly via a pipeline.

[0009] The sensor assembly is configured to collect in real time the pressure signal of the hydraulic cylinder of the hydraulic assembly and the displacement feedback signal of the hydraulic cylinder of the hydraulic assembly.

[0010] The upper structure controller is configured to control the motor of the drive component to drive the hydraulic component with a torque corresponding to a preset target motor torque based on the pressure signal and the displacement feedback signal, so as to realize closed-loop control of the displacement of the hydraulic cylinder of the hydraulic component and the motor speed, thereby reducing the power loss of the hydraulic component; at the same time, it controls the drive component to drive the brush drive component to rotate at the target speed.

[0011] Preferably, the drive assembly includes a motor controller, a servo motor, a fixed displacement pump, a hydraulic tank, a relief valve, and a two-position two-way solenoid directional valve;

[0012] The output of the superstructure controller is electrically connected to the input of the motor controller and the input of the two-position two-way solenoid valve. The output of the motor controller is electrically connected to the input of the servo motor and the input of the brush drive assembly. The servo motor is driven by the fixed displacement pump. The outlet of the fixed displacement pump is connected to the inlet of the hydraulic assembly and the first end pipe of the relief valve. The outlet of the hydraulic oil tank is connected to the inlet of the fixed displacement pump, the inlet of the two-position two-way solenoid valve, and the second end pipe of the relief valve. The inlet of the two-position two-way solenoid valve is connected to the inlet pipe of the hydraulic assembly.

[0013] Preferably, the drive assembly further includes a first suction and return oil filter, a second suction and return oil filter, a third suction and return oil filter, and a fourth suction and return oil filter, wherein the first end of the first suction and return oil filter, the first end of the second suction and return oil filter, the first end of the third suction and return oil filter, and the first end of the fourth suction and return oil filter are connected to the hydraulic oil tank pipeline; the second end of the first suction and return oil filter is connected to the two-position two-way solenoid directional valve pipeline; the second end of the second suction and return oil filter is connected to the second end of the relief valve pipeline; the second end of the third suction and return oil filter is connected to the oil inlet pipeline of the metering pump; and the second end of the fourth suction and return oil filter is connected to the oil inlet pipeline of the hydraulic assembly.

[0014] Preferably, the drive assembly further includes a manual pump and a level and temperature gauge disposed on the hydraulic oil tank, wherein the first end of the manual pump is connected to the second end of the third oil suction and return filter, the second end of the manual pump is connected to the first end of the overflow valve, and the output end of the level and temperature gauge is electrically connected to the input end of the superstructure controller.

[0015] Preferably, the hydraulic assembly includes a ground pressure regulating assembly and an upper structure actuation assembly, wherein the output terminal of the upper structure controller is electrically connected to the input terminal of the ground pressure regulating assembly and the input terminal of the upper structure actuation assembly, and the drive assembly is connected to the ground pressure regulating assembly and the upper structure actuation assembly.

[0016] Preferably, the grounding pressure regulating assembly includes a first three-position four-way solenoid directional valve, a first one-way hydraulic lock, a second one-way hydraulic lock, a left front disc brush lifting cylinder, and a right front disc brush lifting cylinder.

[0017] Specifically, the output terminal of the superstructure controller is electrically connected to the input terminals of the first three-position four-way solenoid directional valve, the first one-way hydraulic lock, and the second one-way hydraulic lock. The input terminal of the first three-position four-way solenoid directional valve is connected to the output terminal of the hydraulic component via a pipeline. The output terminal of the first three-position four-way solenoid directional valve is connected to the first end of the first one-way hydraulic lock and the second end of the second one-way hydraulic lock via a pipeline. The second end of the first one-way hydraulic lock is connected to the pipeline of the left front disc brush lifting cylinder, and the second end of the second one-way hydraulic lock is connected to the pipeline of the right front disc brush lifting cylinder.

[0018] Preferably, the upper structure actuation assembly includes a second three-position four-way solenoid directional valve, a third three-position four-way solenoid directional valve, a fourth three-position four-way solenoid directional valve, a fifth three-position four-way solenoid directional valve, a sixth three-position four-way solenoid directional valve, a first two-way hydraulic lock, a second two-way hydraulic lock, a third two-way hydraulic lock, a fourth two-way hydraulic lock, a fifth two-way hydraulic lock, a sixth two-way hydraulic lock, a seventh two-way hydraulic lock, a left rear disc brush lifting cylinder, a right rear disc brush lifting cylinder, a dust suction port lifting cylinder, a dust collection box lifting cylinder, and a rear door opening and closing cylinder;

[0019] The output terminal of the upper-mount controller is electrically connected to the input terminals of the second, third, fourth, fifth, and sixth three-position four-way solenoid valves, as well as the input terminals of the first, second, third, fourth, fifth, sixth, and seventh bidirectional hydraulic locks. The inlets of the second, third, fourth, fifth, and sixth three-position four-way solenoid valves are connected to the outlet pipe of the drive assembly. The second, third, and fourth three-way solenoid valves are connected to the first end of the first bidirectional hydraulic lock and the left rear disc brush lifting cylinder. The pipeline connections are as follows: the second end of the first bidirectional hydraulic lock is connected to the pipeline of the left rear disc brush lifting cylinder; the third three-position four-way solenoid valve is connected to the first end of the second bidirectional hydraulic lock and the pipeline of the right rear disc brush lifting cylinder; the second end of the second bidirectional hydraulic lock is connected to the pipeline of the right rear disc brush lifting cylinder; the fourth three-position four-way solenoid valve is connected to the pipelines of the first end of the third bidirectional hydraulic lock and the first end of the fourth bidirectional hydraulic lock; the second ends of the third bidirectional hydraulic lock and the second ends of the fourth bidirectional hydraulic lock are connected to the pipeline of the dust suction port lifting cylinder; the fifth three-position four-way solenoid valve is connected to the pipelines of the first end of the fifth bidirectional hydraulic lock and the first end of the sixth bidirectional hydraulic lock; the second ends of the fifth bidirectional hydraulic lock and the second ends of the sixth bidirectional hydraulic lock are connected to the pipeline of the dust collection box lifting cylinder; the sixth three-position four-way solenoid valve is connected to the first end of the seventh bidirectional hydraulic lock and the pipeline of the rear door opening and closing cylinder; the second end of the seventh bidirectional hydraulic lock is connected to the pipeline of the rear door opening and closing cylinder.

[0020] Preferably, the disc brush drive assembly includes a first disc brush drive motor, a second disc brush drive motor, a third disc brush drive motor, and a fourth disc brush drive motor, wherein the input terminals of the first disc brush drive motor, the second disc brush drive motor, the third disc brush drive motor, and the fourth disc brush drive motor are electrically connected to the output terminal of the motor controller.

[0021] Preferably, the sensor assembly includes a pressure sensor disposed between the drive assembly and the hydraulic assembly circuit, and a displacement sensor disposed on the brush lifting cylinder of the hydraulic cylinder of the hydraulic assembly, wherein the output terminal of the pressure sensor and the output terminal of the displacement sensor are electrically connected to the input terminal of the superstructure controller.

[0022] The present invention also discloses an electric sweeper, including a sweeper body and an electric sweeper electro-hydraulic drive system as described in any of the above claims, wherein the electric sweeper electro-hydraulic drive system is disposed on the sweeper body.

[0023] In summary, the electric sweeper and its electro-hydraulic drive system provided in this embodiment achieve automatic adjustment and pressure maintenance of the disc brush ground pressure through motor torque mode control of the pump control system, and achieve speed regulation function of the upper structure action module and disc brush speed adjustment control through motor speed mode control. During the sweeping process, the motor-driven disc brush can achieve high-speed rotation, adapting to future high-speed operations. On the other hand, the use of a pump control system avoids large amounts of throttling and overflow losses, achieving energy-saving effects. Automatic pressure adjustment through torque mode ensures the contact area between the disc brush bristles and the road surface, improving sweeping efficiency. This solves the problems of existing electric sweeper electro-hydraulic drive systems, which cannot achieve proper adjustment, frequently miss areas, and also suffer from high system costs and large system energy losses. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an electro-hydraulic drive system for an electric sweeper provided in an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the control principle of the ground pressure regulating component of the electro-hydraulic drive system of an electric sweeper provided in an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of a pressure, position, and speed switching control strategy for an electro-hydraulic drive system of an electric sweeper provided in an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Please see Figures 1 to 3 The first embodiment of the present invention provides an electro-hydraulic drive system for an electric sweeper, including: an upper controller 1, a drive assembly, a hydraulic assembly, a disc brush drive assembly, and a sensor assembly;

[0030] The output terminal of the upper-mount controller 1 is electrically connected to the input terminal of the drive component, the input terminal of the hydraulic component, and the input terminal of the disc brush drive component. The input terminal of the upper-mount controller 1 is electrically connected to the output terminal of the sensor component. The output terminal of the drive component is electrically connected to the input terminal of the disc brush drive component. The output terminal of the disc brush drive component is used to electrically connect to the control terminal of the disc brush cleaning device of the electric sweeper. The drive component is connected to the hydraulic component via a pipeline.

[0031] The sensor assembly is configured to collect in real time the pressure signal of the hydraulic cylinder of the hydraulic assembly and the displacement feedback signal of the hydraulic cylinder of the hydraulic assembly.

[0032] The upper-mount controller 1 is configured to control the motor of the drive component to drive the hydraulic component to operate with a torque corresponding to a preset target motor torque based on the pressure signal and the displacement feedback signal, so as to realize closed-loop control of the displacement of the hydraulic cylinder of the hydraulic component and the motor speed, thereby reducing the power loss of the hydraulic component; at the same time, it controls the drive component to drive the brush drive component to rotate at a target speed.

[0033] Currently, the superstructure of electric sweepers on the market is mainly divided into two parts: the sweeping hydraulic system module and the pneumatic conveying module. Regarding the sweeping hydraulic system module, firstly, because the movement speed and required pressure of each actuator are different, the traditional hydraulic system design uses throttle valves on each actuator branch to adjust the speed of the corresponding hydraulic cylinders, while the working pressure of each actuator is set by the system relief valve to determine the system's maximum working pressure. Secondly, due to the special limitations of the electric sweeper's hydraulic system, the disc brush speed cannot reach high speeds on small equipment, thus making it unsuitable for high-speed sweeping conditions, i.e., cleaning work on highways. Finally, during the operation of electric sweepers, the grounding pressure of the disc brush is a crucial factor affecting their working efficiency. Currently, the control of the disc brush grounding pressure is mostly achieved using springs or pressure valves. While using springs can control the grounding pressure of the disc brush to some extent and prevent the brush bristles from wearing out too quickly, its disadvantages are also very obvious: it cannot be properly adjusted, which may lead to frequent missed sweeping situations. On the other hand, using pressure valves to control the disc brush cylinder branch can achieve segmented pressure adjustment, allowing the disc brush grounding pressure to be adjusted in a timely manner according to the working conditions, but at the same time, it will also bring significant energy loss.

[0034] Specifically, in this embodiment, the electric sweeper's electro-hydraulic drive system uses a pressure-position-speed switching control strategy to control the electric sweeper's operation process. Before sweeping, the sweeping disc and suction port need to be lowered. During the sweeping operation, the ground pressure and height of the sweeping disc need to be adaptively adjusted. After the operation is completed, the sweeping disc needs to be retracted and the dust collection box needs to be emptied. The control objectives in each of these processes are different. During the operation, the adaptive ground pressure adjustment stage uses pressure and position as control targets. By giving pressure and displacement, the control mode is switched to drive the corresponding hydraulic cylinder. The position and system pressure feedback signals of the brush drive cylinder are received to achieve closed-loop control of pressure and position. In addition, the brush speed control stage uses speed as the control target. By giving a speed value, the servo driver AD module collects the current position signal in real time to achieve closed-loop control of the brush drive motor speed. Before, after, and during the transfer and dumping operation, this stage uses speed and pressure as control targets. Unlike the adaptive ground pressure adjustment stage, in this stage, the system pressure and speed settings of each actuator have corresponding fixed values, but they are different between each execution stage. The control method is similar to the ground pressure adjustment stage, but a closed-loop control mode of pressure and an open-loop control mode of flow is adopted.

[0035] In one possible embodiment of the present invention, the drive assembly includes a motor controller 3, a servo motor 5, a metering pump 6, a hydraulic oil tank 8, an overflow valve 11, and a two-position two-way solenoid directional valve 12.

[0036] The output of the upper-mount controller 1 is electrically connected to the input of the motor controller 3 and the input of the two-position two-way solenoid valve 12. The output of the motor controller 3 is electrically connected to the input of the servo motor 5 and the input of the disc brush drive assembly. The servo motor 5 is driven by the fixed displacement pump 6. The outlet of the fixed displacement pump 6 is connected to the inlet of the hydraulic assembly and the first end pipe of the overflow valve 11. The outlet of the hydraulic oil tank 8 is connected to the inlet of the fixed displacement pump 6, the inlet of the two-position two-way solenoid valve 12 and the second end pipe of the overflow valve 11. The inlet of the two-position two-way solenoid valve 12 is connected to the inlet pipe of the hydraulic assembly.

[0037] Specifically, in this embodiment, two sweeping discs, i.e., a four-disc brush sweeping device, are installed on each of the left and right sides of the electric sweeper. The left front, right front, left rear, and left rear disc brushes are all driven by the same servo motor. The drive information of the servo motor 5 is given through the corresponding motor controller 3. The control signals of the drive motor controllers of the four disc brushes are sent by the upper structure controller 1. The controller can send corresponding control signals according to the actual road conditions, and the current motor speed can be fed back to the motor controller 3 through the speed measurement module of the servo driver, thereby realizing closed-loop control of the speed. The oil inlet of the two-position two-way valve solenoid directional valve 12 is connected to the oil inlet pipeline of the electro-hydraulic drive system of the electric sweeper, and the oil outlet is connected to the hydraulic oil tank 8. Its purpose is to unload during the transfer process after the electric sweeper has finished its operation, thereby preventing the hydraulic system from overheating and causing the entire system to malfunction.

[0038] In this embodiment, one end of the overflow valve 11 is connected to the main oil inlet pipe of the electro-hydraulic drive system of the electric sweeper, and the other end of the overflow valve 11 is connected to the return oil pipe of the electro-hydraulic drive system of the electric sweeper. It acts as a safety valve in the electro-hydraulic drive system of the electric sweeper, and is used to control the operation of each branch during the execution of the action.

[0039] In one possible embodiment of the present invention, the drive assembly further includes a first suction and return oil filter 101, a second suction and return oil filter 102, a third suction and return oil filter 103, and a fourth suction and return oil filter 104. The first end of the first suction and return oil filter 101, the first end of the second suction and return oil filter 102, the first end of the third suction and return oil filter 103, and the first end of the fourth suction and return oil filter 104 are connected to the hydraulic oil tank 8 via a pipeline. The second end of the first suction and return oil filter 101 is connected to the two-position two-way solenoid directional valve 12 via a pipeline. The second end of the second suction and return oil filter 102 is connected to the second end of the overflow valve 11 via a pipeline. The second end of the third suction and return oil filter 103 is connected to the inlet pipeline of the metering pump 6. The second end of the fourth suction and return oil filter 104 is connected to the inlet pipeline of the hydraulic assembly.

[0040] Specifically, in this embodiment, the hydraulic oil tank 8 is equipped with a suction and return oil filter. The suction filter is installed at the inlet pipe of the metering pump and its function is to filter contaminants in the hydraulic oil tank 8, protect the power component hydraulic pump, and prevent damage to the hydraulic components in the entire electric sweeper's electro-hydraulic drive system. In order to ensure the circulation of hydraulic oil in the oil supply circuit of the electric sweeper's electro-hydraulic drive system, a return oil filter is installed on the return oil line of each action branch to filter impurities in the hydraulic oil, so that the hydraulic oil flowing back to the hydraulic oil tank 8 is relatively pure, which also serves as a filtering function.

[0041] In one possible embodiment of the present invention, the drive assembly further includes a manual pump 7 and a level and temperature gauge 9 disposed on the hydraulic oil tank 8, wherein the first end of the manual pump 7 is connected to the second end of the third oil suction and return filter 103, the second end of the manual pump 7 is connected to the first end of the overflow valve 11, and the output end of the level and temperature gauge 9 is electrically connected to the input end of the upper controller 1.

[0042] Specifically, in this embodiment, the manual pump 7 is installed in parallel on the oil inlet line of the metering pump 6. When the electro-hydraulic drive system of the electric sweeper malfunctions and the upper hydraulic system needs to be repaired and troubleshooted, the manual pump 7 facilitates troubleshooting. A level and temperature gauge 9 is installed on the hydraulic oil tank 8. During the operation of the electro-hydraulic drive system of the electric sweeper, the level and temperature gauge 9 can detect the height and temperature of the hydraulic oil in real time. It also has a level sensor with a minimum level protection mechanism. When the level in the hydraulic oil tank 8 falls below the set minimum level, an alarm can be triggered by a buzzer or other warning device, stopping the entire system from operating.

[0043] In one possible embodiment of the present invention, the hydraulic assembly includes a ground pressure regulating assembly and an upper structure actuation assembly, wherein the output terminal of the upper structure controller 1 is electrically connected to the input terminal of the ground pressure regulating assembly and the input terminal of the upper structure actuation assembly, and the drive assembly is connected to the ground pressure regulating assembly and the upper structure actuation assembly.

[0044] Specifically, in this embodiment, the grounding pressure regulating component sends a control signal through the upper structure controller 1 to achieve torque mode control of the hydraulic pump drive motor, obtains the target torque to make the rod chamber of the hydraulic cylinder reach the target pressure, and the pressure sensor in the sensor component feeds back the oil inlet pressure of the pressure regulating module. After comparing the feedback signal, the target pressure control signal is obtained through sliding mode control to achieve closed-loop control of the system pressure. The upper structure action component is driven by the hydraulic cylinders of each execution branch in the electro-hydraulic drive system of the electric sweeper. The movement speed of each execution branch hydraulic cylinder is controlled by controlling the motor controller 3 to change the motor speed according to the target end movement speed, thereby changing the flow rate of the branch and achieving control of the movement speed of the execution cylinder. In short, the grounding pressure regulating component achieves flow closed-loop control. In the actual control process, the flow setting of the upper structure controller 1 sends a signal to the servo controller, compares the displacement given signal with the feedback signal of the displacement sensor, obtains the output signal, calculates the speed of the servo motor 5 to drive the oil pump to rotate, and achieves closed-loop control of the brush grounding height.

[0045] In this embodiment, during the operation of the electric sweeper, each action has set pressure, position, and speed parameters. Appropriate control modes are switched according to different system characteristics and requirements. The control modes of the electric sweeper's electro-hydraulic drive system include a pressure control module and a position and speed control module. The ground pressure adjustment component uses position and pressure as control targets and switches to the pressure and position control module. The upper structure action component uses speed and pressure as control targets and switches to the speed and pressure control module.

[0046] In one possible embodiment of the present invention, the ground pressure regulating assembly includes a first three-position four-way solenoid directional valve 13, a first one-way hydraulic lock 191, a second one-way hydraulic lock 192, a left front disc brush lifting cylinder 21, and a right front disc brush lifting cylinder 22.

[0047] The output of the superstructure controller 1 is electrically connected to the input of the first three-position four-way solenoid valve 13, the input of the first one-way hydraulic lock 191, and the input of the second one-way hydraulic lock 192. The input of the first three-position four-way solenoid valve is connected to the output of the hydraulic component. The output of the first three-position four-way solenoid valve 13 is connected to the first end of the first one-way hydraulic lock 191 and the second end of the second one-way hydraulic lock 192. The second end of the first one-way hydraulic lock 191 is connected to the left front disc brush lifting cylinder 21. The second end of the second one-way hydraulic lock 192 is connected to the right front disc brush lifting cylinder 22.

[0048] Specifically, in this embodiment, the left front disc brush lifting cylinder 21 and the right front disc brush lifting cylinder 22 are mainly used to lift the disc brush of the electric sweeper and control the grounding pressure of the disc brush of the electric sweeper; the first three-position four-way solenoid reversing valve 13 is used to control the operation of the left front disc brush lifting cylinder 21 and the right front disc brush lifting cylinder 22.

[0049] In this embodiment, the first one-way hydraulic lock 191 and the second one-way hydraulic lock 192 are respectively installed in the brush lifting action branch and the rear door opening and closing action branch. In this branch, the oil passes through the first three-position four-way reversing valve 13, the first one-way hydraulic lock 191 and the second one-way hydraulic lock 192 to the brush lifting cylinder and the rear door opening and closing cylinder. After the brush completes the cleaning work and rises, it ensures that the brush lifting cylinder can be kept in the highest position without falling when there is an external load. In the rear door opening and closing branch, the function of the first one-way hydraulic lock 191 and the second one-way hydraulic lock 192 is to ensure that the garbage in the dust collection box of the electric sweeper will not leak during operation and transportation.

[0050] In this embodiment, the two-position two-way solenoid directional valve 12 is normally closed. The controller 1 sends a current signal to the electromagnet DT13, thereby controlling the direction of the two-position two-way solenoid directional valve 12 to unload the hydraulic system of the upper structure before the electric sweeper is transferred. The first three-position four-way solenoid directional valve 13 switches the branch oil circuit by controlling the current of its electromagnets DT1 and DT2, thereby realizing the lifting and lowering of the left and right front disc brushes. When the electro-hydraulic drive system of the electric sweeper is working, the superstructure controller 1 sends a current signal to the electromagnet DT1 of the first three-position four-way solenoid valve 13. Hydraulic oil flows through the first three-position four-way solenoid valve 13. When the one-way hydraulic lock opening pressure is reached, the oil enters the rodless chamber of the left front and right front disc brush lifting cylinders. The left front and right front disc brushes fall to the ground under the action of gravity, and the disc brushes are ready for sweeping operations. After the electric sweeper finishes its operation, the superstructure controller 1 sends a current signal to the electromagnet DT2 of the first three-position four-way solenoid valve 13. Hydraulic oil flows through the first three-position four-way solenoid valve 13 into the rod chamber of the left front and right front disc brush lifting cylinders. Under the action of the cylinders, the disc brushes are lifted to the bottom of the subframe, completing the retrieval action and proceeding with the transfer operation. The grounding pressure regulating component sends a current signal to the electromagnet DT2 of the first three-position four-way solenoid directional valve 13 through the upper controller 1. The hydraulic oil enters the rod chamber of the left front and right front disc brush lifting cylinders through the first three-position four-way solenoid directional valve 13. Under the action of the cylinder, the disc brush obtains a certain lifting force, thereby offsetting part of the disc brush's own weight and obtaining the ideal disc brush grounding pressure.

[0051] Specifically, the upper structure controller 1 outputs a voltage control signal through the analog output module of the DSP, which acts on the servo driver. Control is achieved through the servo motor torque mode to obtain the target torque of the servo motor required for the ideal grounding pressure of the electric sweeper under specific working conditions. This, in turn, controls the servo motor 5 to drive the quantitative pump 6, thus driving the entire electro-hydraulic drive system of the electric sweeper. During the movement of the left and right front disc brush lifting cylinders, pressure sensors installed in the main oil circuit acquire the pressure signal of the current hydraulic cylinder in real time. The upper structure controller 1's acquisition module collects the pressure sensor information to achieve closed-loop pressure control in the system. Simultaneously, a displacement sensor is installed on the left front disc brush lifting cylinder. The magnitude of the disc brush grounding pressure is related to the grounding distance. The displacement sensor at the end acquires the displacement of the disc brush lifting cylinder and feeds it back to the upper structure controller 1, achieving closed-loop displacement control. In addition, the AD module can collect the current position signal in real time; the rotary transformer feeds back the servo motor speed to the servo driver in real time through the electromagnetic induction principle, and the servo driver's speed measurement module can feed back the current motor speed to the controller in the form of analog voltage, thereby realizing closed-loop control of the motor speed.

[0052] In one possible embodiment of the present invention, the upper structure actuation assembly includes a second three-position four-way solenoid valve 14, a third three-position four-way solenoid valve 15, a fourth three-position four-way solenoid valve 16, a fifth three-position four-way solenoid valve 17, a sixth three-position four-way solenoid valve 18, a first two-way hydraulic lock 201, a second two-way hydraulic lock 202, a third two-way hydraulic lock 203, a fourth two-way hydraulic lock 204, a fifth two-way hydraulic lock 205, a sixth two-way hydraulic lock 206, a seventh two-way hydraulic lock 207, a left rear disc brush lifting cylinder 23, a right rear disc brush lifting cylinder 24, a dust suction port lifting cylinder 25, a dust collection box lifting cylinder 26, and a rear door opening and closing cylinder 27.

[0053] The output terminal of the upper-mounted controller 1 is connected to the input terminals of the second three-position four-way solenoid valve 14, the third three-position four-way solenoid valve 15, the fourth three-position four-way solenoid valve 16, the fifth three-position four-way solenoid valve 17, the sixth three-position four-way solenoid valve 18, the first bidirectional hydraulic lock 201, the second bidirectional hydraulic lock 202, the third bidirectional hydraulic lock 203, the fourth bidirectional hydraulic lock 204, and the fifth bidirectional hydraulic lock 205. The input terminals of the sixth bidirectional hydraulic lock 206 and the seventh bidirectional hydraulic lock 207 are electrically connected. The oil inlets of the second three-position four-way solenoid valve 14, the third three-position four-way solenoid valve 15, the fourth three-position four-way solenoid valve 16, the fifth three-position four-way solenoid valve 17, and the sixth three-position four-way solenoid valve 18 are connected to the oil outlet pipe of the drive assembly. The second three-position four-way solenoid valve 14 is connected to the first end of the first bidirectional hydraulic lock 201 and the pipe of the left rear disc brush lifting cylinder 23. The second end of the first bidirectional hydraulic lock 201 is connected to the pipe of the left rear disc brush lifting cylinder 23. The third three-position four-way solenoid valve 15 is connected to the first end of the second bidirectional hydraulic lock 202 and the pipe of the right rear disc brush lifting cylinder 24. The second end of the second bidirectional hydraulic lock 202 is connected to the pipe of the right rear disc brush lifting cylinder 24. The fourth three-position four-way solenoid valve 16 is connected to the pipe of the first end of the third bidirectional hydraulic lock 203 and the first end of the fourth bidirectional hydraulic lock 204. The second end of the third bidirectional hydraulic lock 203 and the fourth three-position four-way solenoid valve 204 are connected to the pipe of the fourth bidirectional hydraulic lock 204. The second end of the fifth three-position four-way solenoid valve 17 is connected to the first end of the fifth two-way hydraulic lock 205 and the first end of the sixth two-way hydraulic lock 206. The second end of the fifth two-way hydraulic lock 205 and the second end of the sixth two-way hydraulic lock 206 are connected to the dust collection box lifting cylinder 26. The sixth three-position four-way solenoid valve 18 is connected to the first end of the seventh two-way hydraulic lock 207 and the rear door opening and closing cylinder 27. The second end of the seventh two-way hydraulic lock 207 is connected to the rear door opening and closing cylinder 27.

[0054] Specifically, in this embodiment, each of the bidirectional hydraulic locks is installed in the dust suction port lifting action branch and the dust collection box lifting action branch. The oil in this branch also passes through multiple three-position four-way reversing valves and the bidirectional hydraulic locks to reach the dust suction port lifting cylinder 25 and the dust collection box lifting cylinder 26. For the dust collection box lifting action branch, the required pressure and flow rate are the largest in the entire electric sweeper electro-hydraulic drive system. The use of bidirectional hydraulic locks can ensure that the electric sweeper will not slide or move due to excessive weight during the unloading process after the operation is completed. The left front disc brush lifting cylinder 21, the right front disc brush lifting cylinder 22, the left rear disc brush lifting cylinder 23, the left rear disc brush lifting cylinder 24, the dust suction port lifting cylinder 25, the dust collection box lifting cylinder 26, and the rear door opening and closing cylinder 27 achieve lifting, raising, and opening / closing actions of the mechanism through signals from all three-position four-way directional valves; that is, the upper structure controller 1 sends control signals to all three-position four-way solenoid directional valves, and then the electromagnets DT1, DT2, DT3, DT4, DT5, DT6, DT7, DT8, DT9, DT10, DT11, and DT12 on the three-position four-way solenoid directional valves realize the switching of the hydraulic circuits of each branch in the electro-hydraulic drive system of the electric sweeper. In this electric sweeper, the electro-hydraulic drive system eliminates the throttling and speed control valves in the various actuator branches of the traditional electric sweeper's hydraulic system. Since the actions of each actuator are independent of each other during execution, the movement speed of the left front disc brush lifting cylinder 21, the right front disc brush lifting cylinder 22, the left rear disc brush lifting cylinder 23, the left rear disc brush lifting cylinder 24, the dust suction port lifting cylinder 25, the dust collection box lifting cylinder 26, and the rear door opening and closing cylinder 27 can be controlled by adjusting the rotation speed of the drive motor. This allows the target flow rate required for each branch to be obtained, thereby achieving speed control of the actions performed in each branch.

[0055] In this embodiment, the movement speed of each branch actuator cylinder of the upper structure actuation component is signaled by the upper structure controller 1. The motor controller 3 controls the speed of the hydraulic pump drive motor, changing the branch flow to control the movement speed of the corresponding branch actuator cylinders. The motor controller 3 achieves torque control of the hydraulic pump drive motor through torque mode, and achieves closed-loop control of the branch hydraulic circuit pressure through the pressure sensor in the main oil circuit. The oil from the left and right rear disc brush branches is delivered by the hydraulic pump to the second three-position four-way solenoid valve 14 and the third three-position four-way solenoid valve 15, and reaches the actuator cylinders, namely the left rear disc brush lifting cylinder 23 and the second three-position four-way solenoid valve 14, through the one-way hydraulic lock. The specific lifting and lowering of the left and right rear disc brush actuator cylinders is controlled by the second three-position four-way solenoid valve 14 and the third three-position four-way solenoid valve 15. The upper structure controller 1 sends a three-position four-way solenoid valve control signal to realize the lifting and lowering action of the left and right rear disc brushes. Specifically, before the electric sweeper begins operation, the superstructure controller 1 sends current signals to the electromagnet DT3 of the second three-position four-way solenoid valve 14 and the electromagnet DT5 of the third three-position four-way solenoid valve 15. Hydraulic oil flows through the three-position four-way solenoid valves. When the one-way hydraulic lock opening pressure is reached, the oil enters the rodless chamber of the left and right rear disc brush lifting cylinders. The left and right rear disc brushes fall to the ground under gravity, and the second three-position four-way solenoid valve 14 returns to the neutral position, preparing the disc brushes for sweeping operations. After the electric sweeper completes its operation, the superstructure controller 1 sends current signals to the electromagnet DT4 of the second three-position four-way solenoid valve 14 and the electromagnet DT6 of the third three-position four-way solenoid valve 15. Hydraulic oil flows through the three-position four-way solenoid valves into the rod chamber of the left and right rear disc brush lifting cylinders. Under the action of the cylinders, the disc brushes are lifted to the bottom of the subframe, completing the retrieval action and proceeding with the transfer operation.

[0056] The lifting and lowering of the suction port cylinder 25 is controlled by the fourth three-position four-way solenoid valve 16. The upper controller 1 sends a control signal to the three-position four-way solenoid valve to realize the lifting and lowering action of the suction port. Specifically, before the electric sweeper begins operation, the superstructure controller 1 sends a current signal to the electromagnet DT7 of the fourth three-position four-way solenoid valve 16. Hydraulic oil flows through the three-position four-way solenoid valve. When the pressure of the bidirectional hydraulic lock is reached, the oil enters the rodless chamber of the suction port lifting cylinder. The suction port falls to the ground under gravity, and the pneumatic conveying system is ready to work. After the electric sweeper finishes operation, the superstructure controller 1 sends a current signal to the electromagnet DT8 of the fourth three-position four-way solenoid valve 16. Hydraulic oil flows through the three-position four-way solenoid valve into the rod chamber of the suction port lifting cylinder. Under the action of the cylinder, the suction port is lifted to the bottom of the dust collection box at a certain distance from the ground, completing the recycling action. The reversing valve returns to the neutral position, and the bidirectional hydraulic lock ensures that the suction port will not fall, allowing for the transfer operation. The lifting of the rear door opening / closing cylinder 27 is specifically controlled by the sixth three-position four-way directional valve 18. The upper-mount controller 1 sends a control signal to the three-position four-way solenoid directional valve to realize the opening and closing action of the rear door. The lifting of the dust collection box cylinder 26 is specifically controlled by the fifth three-position four-way solenoid directional valve 17. The upper-mount controller 1 sends a control signal to the three-position four-way solenoid directional valve to realize the lifting action of the dust collection box. Specifically, after the electric sweeper is transported to the designated location, the superstructure controller 1 sends current signals to the electromagnet DT9 of the fifth three-position four-way solenoid directional valve 17 and the electromagnet DT11 of the sixth three-position four-way solenoid directional valve 18. The hydraulic oil passes through the three-position four-way solenoid directional valve, so that the opening pressure of the bidirectional and unidirectional hydraulic locks in the two branches reaches the required level. The oil enters the cylinder for upgrading the dust collection box and the rodless chamber of the cylinder for opening and closing the rear door. The dust collection box lifting cylinder lifts the dust collection box, and at the same time, the cylinder for opening and closing the rear door opens the rear door of the dust collection box. When the dust collection box reaches the highest position, the superstructure controller 1 returns to the neutral position through the directional valve. The branch is protected by the bidirectional hydraulic lock to prevent the suction port from falling, and the electric sweeper is unloaded. After the sweeper has finished unloading the garbage, the superstructure controller 1 sends current signals to the electromagnet DT10 of the fifth three-position four-way solenoid valve 17 and the electromagnet DT12 of the sixth three-position four-way solenoid valve 18. The hydraulic oil enters the rod chamber of the dust collection box lifting cylinder and the rear door opening and closing cylinder through the three-position four-way solenoid valve. Under the action of the cylinder, the rear door of the dust collection box is closed, completing the recycling action. The sixth three-position four-way solenoid valve 18 returns to the middle position. After the dust collection box returns to the subframe and is in a stable state, the fifth three-position four-way solenoid valve 17 returns to the middle position, completing the unloading work of the electric sweeper.

[0057] In one possible embodiment of the present invention, the disc brush drive assembly includes a first disc brush drive motor 41, a second disc brush drive motor 42, a third disc brush drive motor 43, and a fourth disc brush drive motor 44, wherein the input terminals of the first disc brush drive motor 41, the second disc brush drive motor 42, the third disc brush drive motor 43, and the fourth disc brush drive motor 44 are electrically connected to the output terminal of the motor controller 3.

[0058] Specifically, in this embodiment, the disc brush drive assembly drives the disc brush to rotate via the servo motor 5. All four disc brushes of the electric sweeper use the same servo motor, and the upper-mounted controller 1 sends a signal to the motor controller 3 to drive the motor and obtain the target rotation speed. During the operation of the electric sweeper, each action has set pressure, position, and speed parameters. Appropriate control modes are switched according to different system requirements. These control modes include a pressure control module and a position and speed control module. The disc brush drive assembly uses rotation speed as the control target and switches to the rotation speed control module.

[0059] In this embodiment, the disc brush drive assembly differs from the traditional hydraulic motor drive method. To overcome the limitations of low speed, the servo motor 5 is used to obtain higher speed requirements and more precise speed response for the disc brush. During the operation of the electric sweeper, the required disc brush speed varies depending on the particle size and type of road debris. Therefore, the disc brush drive motor needs both precise control and rapid adjustment characteristics. To achieve the disc brush drive speed, the upper-mount controller 1 sends a control signal to the corresponding disc brush drive motor controller 3. The motor controller 3 controls the output speed of the disc brush drive motor, and the servo motor 5 drives the disc brush to rotate, achieving the required speed. The speed measurement module of the servo driver can feed back the current motor speed to the motor controller 3, thereby realizing closed-loop speed control. The disc brush drive motor speed control is set to four discs. In actual operation, the speeds of the left and right rear disc brush drive motors can be appropriately adjusted according to the amount of road debris to achieve higher efficiency and lower energy consumption.

[0060] In one possible embodiment of the present invention, the sensor assembly includes a pressure sensor 2 disposed between the drive assembly and the hydraulic assembly circuit, and a displacement sensor 28 disposed on the brush lifting cylinder of the hydraulic cylinder of the hydraulic assembly, wherein the output terminal of the pressure sensor 2 and the output terminal of the displacement sensor 28 are electrically connected to the input terminal of the superstructure controller 1.

[0061] Specifically, in this embodiment, the pressure sensor 2 installed in the main oil circuit acquires the pressure signal of the current hydraulic brush lifting cylinder in real time. The pressure sensor information is collected by the acquisition module of the upper device controller 1 to realize closed-loop pressure control in the system. At the same time, the displacement sensor 28 is installed on the left front brush lifting cylinder. The magnitude of the brush grounding pressure is related to the grounding distance. The displacement of the brush lifting cylinder is acquired by the displacement sensor 28 at the end and fed back to the upper device controller 1 to realize closed-loop displacement control.

[0062] In summary, the grounding pressure regulating component replaces the back pressure valve in the traditional disc brush grounding pressure regulating system by controlling the motor torque mode. By adjusting the motor torque mode during the operation of the electric sweeper under different working conditions, the grounding pressure of the disc brush is adjusted to the ideal pressure according to the working conditions, further improving the sweeping efficiency of the electric sweeper, while avoiding the pressure loss caused by the pressure regulating valve. The action speed control of the actuators in each branch of the upper structure action module component is achieved by controlling the speed of the system's quantitative pump drive motor, analyzing the required flow of each branch, and controlling the action speed of the actuators in each branch. This avoids the pressure stagnation process in each branch mechanism due to the system's total pressure setting being too high, eliminates a large number of throttling valves, and reduces the power loss of the upper structure hydraulic system. The disc brush drive component uses an electric motor to drive the disc brush rotation, avoiding the defect of excessively low disc brush speed caused by the design limitations of traditional hydraulic systems. The disc brush speed is directly determined by the motor speed, providing the disc brush speed conditions required for the high-speed operation of the electric sweeper. In simple terms, the electro-hydraulic drive system of the electric sweeper sets different operating modes for different working conditions of the electric sweeper. Based on the required ideal ground pressure, the movement speed of each action branch of the superstructure, and the operating speed of the disc brush, it obtains the target torque and speed of the hydraulic system drive motor and the speed of the disc brush drive motor. In this way, the electric sweeper can automatically adjust the operating speed of the disc brush, the ground pressure of the disc brush, and the high-speed operation target according to different working conditions.

[0063] A second embodiment of the present invention provides an electric sweeper, including a sweeper body and an electric sweeper electro-hydraulic drive system as described in any of the above claims, wherein the electric sweeper electro-hydraulic drive system is disposed on the sweeper body.

[0064] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

Claims

1. An electro-hydraulic drive system for an electric sweeper, characterized in that, include: The upper part includes a controller, drive assembly, hydraulic assembly, disc brush drive assembly, and sensor assembly; The output terminal of the superstructure controller is electrically connected to the input terminal of the drive assembly, the input terminal of the hydraulic assembly, and the input terminal of the disc brush drive assembly. The input terminal of the superstructure controller is electrically connected to the output terminal of the sensor assembly. The output terminal of the drive assembly is electrically connected to the input terminal of the disc brush drive assembly. The output terminal of the disc brush drive assembly is used to electrically connect to the control terminal of the disc brush cleaning device of the electric sweeper. The drive assembly is connected to the hydraulic assembly via a pipeline. The sensor assembly is configured to collect in real time the pressure signal of the hydraulic cylinder of the hydraulic assembly and the displacement feedback signal of the hydraulic cylinder of the hydraulic assembly. The upper structure controller is configured to control the motor of the drive component to drive the hydraulic component to operate with a torque corresponding to a preset target motor torque based on the pressure signal and the displacement feedback signal, so as to realize closed-loop control of the displacement of the hydraulic cylinder of the hydraulic component and the motor speed, thereby reducing the power loss of the hydraulic component; at the same time, it controls the drive component to drive the brush drive component to rotate at the target speed. The drive assembly includes a motor controller, a servo motor, a fixed displacement pump, a hydraulic tank, a relief valve, and a two-position two-way solenoid directional valve. Specifically, the output terminal of the superstructure controller is electrically connected to the input terminal of the motor controller and the input terminal of the two-position two-way solenoid directional valve; the output terminal of the motor controller is electrically connected to the input terminal of the servo motor and the input terminal of the disc brush drive assembly; the servo motor is drivenly connected to the quantitative pump; the oil outlet of the quantitative pump is connected to the oil inlet of the hydraulic assembly and the first end pipe of the overflow valve; the oil outlet of the hydraulic oil tank is connected to the oil inlet pipe of the quantitative pump; the oil inlet of the two-position two-way solenoid directional valve is connected to the oil inlet pipe of the hydraulic assembly; the oil outlet of the two-position two-way solenoid directional valve is connected to the hydraulic oil tank; the first end of the overflow valve is connected to the main oil inlet pipe of the electro-hydraulic drive system of the electric sweeper; and the second end of the overflow valve is connected to the return oil pipe of the electro-hydraulic drive system of the electric sweeper. The sensor assembly includes a pressure sensor disposed between the drive assembly and the hydraulic assembly circuit, and a displacement sensor disposed on the brush lifting cylinder of the hydraulic cylinder of the hydraulic assembly, wherein the output terminal of the pressure sensor and the output terminal of the displacement sensor are electrically connected to the input terminal of the superstructure controller.

2. The electro-hydraulic drive system for an electric sweeper according to claim 1, characterized in that, The drive assembly further includes a first suction and return oil filter, a second suction and return oil filter, a third suction and return oil filter, and a fourth suction and return oil filter. The first end of each of the first, second, third, and fourth suction and return oil filters is connected to the hydraulic oil tank pipeline. The second end of the first suction and return oil filter is connected to the two-position two-way solenoid valve pipeline. The second end of the second suction and return oil filter is connected to the second end of the relief valve pipeline. The second end of the third suction and return oil filter is connected to the inlet pipeline of the metering pump. The second end of the fourth suction and return oil filter is connected to the inlet pipeline of the hydraulic assembly.

3. The electro-hydraulic drive system for an electric sweeper according to claim 2, characterized in that, The drive assembly also includes a manual pump and a level and temperature gauge mounted on the hydraulic tank. The first end of the manual pump is connected to the second end of the third oil suction and return filter via a pipeline, the second end of the manual pump is connected to the first end of the overflow valve via a pipeline, and the output end of the level and temperature gauge is electrically connected to the input end of the superstructure controller.

4. The electro-hydraulic drive system for an electric sweeper according to claim 1, characterized in that, The hydraulic assembly includes a ground pressure regulating assembly and an upper structure actuation assembly, wherein the output terminal of the upper structure controller is electrically connected to the input terminal of the ground pressure regulating assembly and the input terminal of the upper structure actuation assembly, and the drive assembly is connected to the ground pressure regulating assembly and the upper structure actuation assembly.

5. The electro-hydraulic drive system for an electric sweeper according to claim 4, characterized in that, The grounding pressure regulating assembly includes a first three-position four-way solenoid directional valve, a first one-way hydraulic lock, a second one-way hydraulic lock, a left front disc brush lifting cylinder, and a right front disc brush lifting cylinder. Specifically, the output terminal of the superstructure controller is electrically connected to the input terminals of the first three-position four-way solenoid directional valve, the first one-way hydraulic lock, and the second one-way hydraulic lock. The input terminal of the first three-position four-way solenoid directional valve is connected to the output terminal of the hydraulic component via a pipeline. The output terminal of the first three-position four-way solenoid directional valve is connected to the first end of the first one-way hydraulic lock and the second end of the second one-way hydraulic lock via a pipeline. The second end of the first one-way hydraulic lock is connected to the pipeline of the left front disc brush lifting cylinder, and the second end of the second one-way hydraulic lock is connected to the pipeline of the right front disc brush lifting cylinder.

6. The electro-hydraulic drive system for an electric sweeper according to claim 4, characterized in that, The upper structure actuation components include a second three-position four-way solenoid directional valve, a third three-position four-way solenoid directional valve, a fourth three-position four-way solenoid directional valve, a fifth three-position four-way solenoid directional valve, a sixth three-position four-way solenoid directional valve, a first two-way hydraulic lock, a second two-way hydraulic lock, a third two-way hydraulic lock, a fourth two-way hydraulic lock, a fifth two-way hydraulic lock, a sixth two-way hydraulic lock, a seventh two-way hydraulic lock, a left rear disc brush lifting cylinder, a right rear disc brush lifting cylinder, a dust suction port lifting cylinder, a dust collection box lifting cylinder, and a rear door opening and closing cylinder; The output terminal of the upper-mount controller is electrically connected to the input terminals of the second, third, fourth, fifth, and sixth three-position four-way solenoid valves, as well as the input terminals of the first, second, third, fourth, fifth, sixth, and seventh bidirectional hydraulic locks. The inlets of the second, third, fourth, fifth, and sixth three-position four-way solenoid valves are connected to the outlet pipe of the drive assembly. The second, third, and fourth three-way solenoid valves are connected to the first end of the first bidirectional hydraulic lock and the left rear disc brush lifting cylinder. The pipeline connections are as follows: the second end of the first bidirectional hydraulic lock is connected to the pipeline of the left rear disc brush lifting cylinder; the third three-position four-way solenoid valve is connected to the first end of the second bidirectional hydraulic lock and the pipeline of the right rear disc brush lifting cylinder; the second end of the second bidirectional hydraulic lock is connected to the pipeline of the right rear disc brush lifting cylinder; the fourth three-position four-way solenoid valve is connected to the pipelines of the first end of the third bidirectional hydraulic lock and the first end of the fourth bidirectional hydraulic lock; the second ends of the third bidirectional hydraulic lock and the second ends of the fourth bidirectional hydraulic lock are connected to the pipeline of the dust suction port lifting cylinder; the fifth three-position four-way solenoid valve is connected to the pipelines of the first end of the fifth bidirectional hydraulic lock and the first end of the sixth bidirectional hydraulic lock; the second ends of the fifth bidirectional hydraulic lock and the second ends of the sixth bidirectional hydraulic lock are connected to the pipeline of the dust collection box lifting cylinder; the sixth three-position four-way solenoid valve is connected to the first end of the seventh bidirectional hydraulic lock and the pipeline of the rear door opening and closing cylinder; the second end of the seventh bidirectional hydraulic lock is connected to the pipeline of the rear door opening and closing cylinder.

7. The electro-hydraulic drive system for an electric sweeper according to claim 1, characterized in that, The disc brush drive assembly includes a first disc brush drive motor, a second disc brush drive motor, a third disc brush drive motor, and a fourth disc brush drive motor, wherein the input terminals of the first disc brush drive motor, the second disc brush drive motor, the third disc brush drive motor, and the fourth disc brush drive motor are electrically connected to the output terminal of the motor controller.

8. An electric sweeper, characterized in that, The sweeper includes a sweeper body and an electro-hydraulic drive system for an electric sweeper as described in any one of claims 1 to 7, wherein the electro-hydraulic drive system for the electric sweeper is disposed on the sweeper body.

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