Distributed electro-hydraulic driving system based on bucket rod independent oil supplementation and electric excavator

Abstract

The invention provides a distributed electro-hydraulic driving system based on bucket rod independent oil supplementation and an electric excavator. The distributed electro-hydraulic driving system comprises a bucket distributed system assembly, a bucket rod distributed system assembly, a movable arm distributed system assembly and a hydraulic oil tank. Each distributed system assembly is provided with a driving motor to drive an open type variable pump to supply oil to the open type variable pump so as to independently drive a corresponding working oil cylinder to operate, and each bucket rod distributed system assembly is additionally and independently provided with a bucket rod oil supplementing motor to drive a bucket rod metering pump to supply oil to the bucket rod metering pump so as to solve the problems that when a bucket rod oil cylinder operates rapidly, the flow demand is large, and the operation is complex. And oil supply is insufficient. The system aims at achieving high-energy-efficiency distributed driving of multiple linear actuators of the electric excavator so as to solve the problems that a centralized hydraulic system of an existing electric excavator is high in energy consumption and low in energy efficiency.

Description

Technical Field

[0001] The present invention relates to the field of system structure of excavating engineering machinery, and in particular to a distributed electro-hydraulic drive system based on independent oil replenishment of a bucket arm and an electric excavator. Background Art

[0002] As the world pays more and more attention to environmental protection and energy conservation, the high energy consumption and emissions of traditional fuel excavators have become the focus of industry attention. As a new type of environmentally friendly equipment, electric excavators are powered by electric motors. Compared with internal combustion engines, electric motors have lower energy consumption and emissions, which meets the requirements of green construction.

[0003] At present, electric excavators mainly use centralized hydraulic transmission systems, which distribute high-pressure oil provided by a single or two hydraulic pumps through a multi-way valve to drive multiple actuators such as the boom, dipper and bucket. Since the loads faced by each actuator during operation are quite different and fluctuate violently, a large amount of pressure coupling loss and throttling loss are generated at the multi-way valve, causing the energy efficiency of the hydraulic system to be less than 35%, resulting in high energy consumption of the electric excavator and serious range anxiety.

[0004] In summary, the further development of existing electric excavators requires in-depth optimization of the traditional hydraulic system configuration. In view of this, this application is proposed. Summary of the invention

[0005] The present invention provides a distributed electro-hydraulic drive system and an electric excavator based on independent oil replenishment of a boom, aiming to improve at least one of the above-mentioned technical problems.

[0006] In order to solve the above technical problems, the present invention provides a distributed electro-hydraulic drive system based on independent oil replenishment of the dipper arm, including a bucket distributed system component, a dipper arm distributed system component, a boom distributed system component and a hydraulic oil tank; the hydraulic oil tank is respectively connected to the bucket distributed system component, the dipper arm distributed system component and the boom distributed system component.

[0007] Among them, the bucket distributed system components include a bucket drive motor pump, a bucket unloading valve group, a bucket distributed valve group, and a bucket cylinder; the arm distributed system components include an arm oil replenishment motor pump, an arm drive motor pump, an arm first unloading valve group, an arm second unloading valve group, an arm distributed valve group, and an arm cylinder; the boom distributed system components include an arm drive motor pump, an arm unloading valve group, an arm distributed valve group, and an arm cylinder; the bucket drive motor pump is connected to the bucket distributed valve group; the arm drive motor pump is connected to the arm distributed valve group, the arm oil replenishment motor pump is connected to the arm distributed valve group; the arm drive motor pump is connected to the arm distributed valve group connected; thereby providing the system with four independent high-pressure working oil channels; the bucket distributed valve group is connected to the bucket cylinder; the arm distributed valve group is connected to the arm cylinder; the boom distributed valve group is connected to the boom cylinder; by controlling the working oil flow entering each working cylinder, the speed of each working cylinder is controlled; the bucket unloading valve group is arranged at the outlet of the bucket drive motor pump; the arm first unloading valve group is arranged at the outlet of the arm oil replenishment motor pump; the arm second unloading valve group is arranged at the outlet of the arm drive motor pump; the boom unloading valve group is arranged at the outlet of the boom drive motor pump; so as to realize the adjustment of the maximum working pressure and unloading functions.

[0008] Preferably, the bucket drive motor pump includes a bucket drive motor and a bucket variable pump, the bucket unloading valve group includes a bucket pilot overflow valve, a bucket electrically controlled two-position four-way valve, and a bucket check valve, and the bucket distributed valve group includes a bucket first electrically controlled two-position two-way valve, a bucket second electrically controlled two-position two-way valve, a bucket third electrically controlled two-position two-way valve, and a bucket fourth electrically controlled two-position two-way valve.

[0009] Among them, the bucket drive motor is mechanically connected to the bucket variable pump, the bucket variable pump input end is connected to the hydraulic oil tank, the bucket variable pump output end is connected to the bucket distributed valve group inlet through the bucket check valve, the bucket pilot relief valve oil inlet is connected to the bucket variable pump outlet, the bucket pilot relief valve oil outlet is connected to the hydraulic oil tank, the bucket electronically controlled two-position four-way valve is connected to the bucket pilot relief valve to control the opening of the bucket pilot relief valve, the oil inlet of the bucket first electronically controlled two-position two-way valve is connected to the rodless chamber of the bucket cylinder, and the bucket first electronically controlled The oil outlet of the two-position two-way valve is connected to the hydraulic oil tank, the oil inlet of the second electrically controlled two-position two-way valve of the bucket is connected to the output end of the bucket variable pump, the oil outlet of the second electrically controlled two-position two-way valve of the bucket is connected to the rodless chamber of the bucket cylinder, the oil inlet of the third electrically controlled two-position two-way valve of the bucket is connected to the output end of the bucket variable pump, the oil outlet of the third electrically controlled two-position two-way valve of the bucket is connected to the rod chamber of the bucket cylinder, the oil inlet of the fourth electrically controlled two-position two-way valve of the bucket is connected to the rod chamber of the bucket cylinder, and the oil outlet of the fourth electrically controlled two-position two-way valve of the bucket is connected to the hydraulic oil tank.

[0010] Preferably, the bucket drive motor pump outputs high-pressure hydraulic oil that reaches the inlet of the bucket distributed valve group through the bucket one-way valve. When the bucket cylinder is driven to extend, the bucket's second electrically-controlled two-position two-way valve and the bucket's fourth electrically-controlled two-position two-way valve are in the left position, and the high-pressure hydraulic oil enters the rodless chamber of the bucket cylinder through the bucket's second electrically-controlled two-position two-way valve, and the oil in the rod chamber of the bucket cylinder flows back to the hydraulic oil tank through the bucket's fourth electrically-controlled two-position two-way valve, thereby extending the bucket cylinder. When the bucket cylinder is driven to retract, the bucket's first electrically-controlled two-position two-way valve and the bucket's third electrically-controlled two-position two-way valve are in the left position, and the high-pressure hydraulic oil enters the rod chamber of the bucket cylinder through the bucket's third electrically-controlled two-position two-way valve, and the oil in the rodless chamber of the bucket cylinder flows back to the hydraulic oil tank through the bucket's first electrically-controlled two-position two-way valve, thereby retracting the bucket cylinder.

[0011] Among them, the oil inlet of each pilot relief valve is connected to the corresponding variable pump outlet, the oil outlet of each pilot relief valve is connected to the hydraulic oil tank, and each electrically controlled two-position four-way valve is connected to each pilot relief valve to control the opening of each pilot relief valve.

[0012] Preferably, the boom oil replenishment motor pump includes a boom oil replenishment motor and a boom metering pump, the boom drive motor pump includes a boom drive motor and a boom variable pump, the boom first unloading valve group includes a boom first pilot overflow valve, a boom first electrically controlled two-position four-way valve, and a boom first one-way valve, the boom second unloading valve group includes a boom second pilot overflow valve, a boom second electrically controlled two-position four-way valve, and a boom second one-way valve, the boom distributed valve group includes a boom first electrically controlled two-position two-way valve, a boom second electrically controlled two-position two-way valve, a boom third electrically controlled two-position two-way valve, a boom fourth electrically controlled two-position two-way valve, a boom fifth electrically controlled two-position two-way valve, a boom sixth electrically controlled two-position two-way valve, and a boom seventh electrically controlled two-position two-way valve.

[0013] Among them, the boom oil replenishment motor is mechanically connected to the boom metering pump, the boom metering pump input end is connected to the hydraulic oil tank, the boom metering pump output end is connected to the boom distributed valve group inlet through the boom first one-way valve and the boom seventh electronically controlled two-position two-way valve, the boom drive motor is mechanically connected to the boom variable pump, the boom variable pump input end is connected to the hydraulic oil tank, the boom variable pump output end is connected to the boom distributed valve group inlet through the boom second one-way valve, the boom first pilot relief valve oil inlet is connected to the boom metering The pump outlet is connected, the oil outlet of the first pilot relief valve of the boom is connected to the hydraulic oil tank, the first electrically controlled two-position four-way valve of the boom is connected to the first pilot relief valve of the boom to control the opening of the first pilot relief valve of the boom, the oil outlet of the second pilot relief valve of the boom is connected to the hydraulic oil tank, the second electrically controlled two-position four-way valve of the boom is connected to the second pilot relief valve of the boom to control the opening of the second pilot relief valve of the boom, the oil inlet of the first electrically controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, and the oil outlet of the first electrically controlled two-position two-way valve of the boom is connected to the The oil inlet of the second electrically controlled two-position two-way valve of the bucket arm is connected to the output end of the bucket arm variable pump, the oil outlet of the second electrically controlled two-position two-way valve of the bucket arm is connected to the rodless chamber of the bucket arm oil cylinder, the oil inlet of the third electrically controlled two-position two-way valve of the bucket arm is connected to the output end of the bucket arm variable pump, the oil outlet of the third electrically controlled two-position two-way valve of the bucket arm is connected to the rod chamber of the bucket arm oil cylinder, the oil inlet of the fourth electrically controlled two-position two-way valve of the bucket arm is connected to the rod chamber of the bucket arm oil cylinder, and the oil outlet of the fourth electrically controlled two-position two-way valve of the bucket arm is connected to the hydraulic oil tank. The oil inlet of the fifth electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the third electrically controlled two-position two-way valve of the boom, the oil outlet of the fifth electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the second electrically controlled two-position two-way valve of the boom, the oil inlet of the sixth electrically controlled two-position two-way valve of the boom is connected to the rod chamber of the boom cylinder, the oil outlet of the sixth electrically controlled two-position two-way valve of the boom is reserved, the oil inlet of the seventh electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the boom metering pump, and the oil outlet of the seventh electrically controlled two-position two-way valve of the boom is connected to the inlet of the boom distributed valve group.

[0014] Preferably, when the boom is in normal operating conditions, the boom drive motor pump outputs high-pressure hydraulic oil through the second one-way valve of the boom to the inlet of the boom distributed valve group. When the boom cylinder is driven to extend, the second electrically controlled two-position two-way valve of the boom and the fourth electrically controlled two-position two-way valve of the boom are in the left position, and the high-pressure hydraulic oil enters the rodless chamber of the boom cylinder through the second electrically controlled two-position two-way valve of the boom, and the oil in the rod chamber of the boom cylinder flows back to the hydraulic oil tank through the fourth electrically controlled two-position two-way valve of the boom. When the boom cylinder is driven to retract, the first electrically controlled two-position two-way valve of the boom and the third electrically controlled two-position two-way valve of the boom are in the left position, and the high-pressure hydraulic oil enters the rod chamber of the boom cylinder through the third electrically controlled two-position two-way valve of the boom, and the oil in the rodless chamber of the boom cylinder flows back to the hydraulic oil tank through the first electrically controlled two-position two-way valve of the boom.

[0015] Among them, when the boom cylinder is in a fast-running condition, the high-pressure hydraulic oil provided by the boom drive motor pump cannot meet the boom's large flow demand. At this time, the boom's seventh electrically-controlled two-position two-way valve is in the left position, and the boom's oil replenishment motor drives the boom's quantitative pump at a certain speed to output high-pressure hydraulic oil through the boom's seventh electrically-controlled two-position two-way valve into the boom's distributed valve group. The boom's oil replenishment motor pump and the boom drive motor pump work simultaneously to solve the problem of large flow demand when the boom is running quickly.

[0016] Among them, the fifth electrically controlled two-position two-way valve of the boom is configured to regenerate the energy of the rod chamber of the boom cylinder to the rodless chamber of the boom cylinder, and the sixth electrically controlled two-position two-way valve of the boom is used for hydraulic energy recovery.

[0017] Preferably, the boom drive motor pump includes a boom drive motor and a boom variable pump, the boom unloading valve group includes a boom pilot overflow valve, a boom electrically controlled two-position four-way valve, and a boom check valve, and the boom distributed valve group includes a boom first electrically controlled two-position two-way valve, a boom second electrically controlled two-position two-way valve, a boom third electrically controlled two-position two-way valve, a boom fourth electrically controlled two-position two-way valve, a boom fifth electrically controlled two-position two-way valve, and a boom sixth electrically controlled two-position two-way valve.

[0018] Wherein, the boom drive motor is mechanically connected to the boom variable pump, the boom variable pump input end is connected to the hydraulic oil tank, the boom variable pump output end is connected to the boom distributed valve assembly inlet, the boom pilot relief valve oil inlet is connected to the boom variable pump outlet, the boom pilot relief valve oil outlet is connected to the hydraulic oil tank, the boom electrically controlled two-position four-way valve is connected to the boom pilot relief valve to control the opening of the boom pilot relief valve, the oil inlet of the boom first electrically controlled two-position two-way valve is connected to the rod chamber of the boom cylinder, the oil outlet of the boom first electrically controlled two-position two-way valve is connected to the hydraulic oil tank, the oil inlet of the boom second electrically controlled two-position two-way valve is connected to the output end of the boom variable pump, the oil outlet of the boom second electrically controlled two-position two-way valve is connected to the rod chamber of the boom cylinder, the oil inlet of the boom third electrically controlled two-position two-way valve is connected to the The output end of the boom variable pump is connected, the oil outlet of the third electrically controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, the oil inlet of the fourth electrically controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, the oil outlet of the fourth electrically controlled two-position two-way valve of the boom is connected to the hydraulic oil tank, the oil inlet of the fifth electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the third electrically controlled two-position two-way valve of the boom, and the oil outlet of the fourth electrically controlled two-position two-way valve of the boom is connected to the hydraulic oil tank. The oil outlet of the two-position two-way valve is connected to the oil outlet of the second electrically controlled two-position two-way valve of the boom, the oil inlet of the sixth electrically controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, and the oil outlet of the sixth electrically controlled two-position two-way valve of the boom is reserved; preferably, the oil inlet of the boom oil replenishment electric controlled two-position two-way valve is connected to the oil outlet of the boom metering pump, and the oil outlet of the boom oil replenishment electric controlled two-position two-way valve is connected to the inlet of the boom distributed valve group.

[0019] Preferably, the boom drive motor pump outputs high-pressure hydraulic oil that reaches the inlet of the boom distributed valve group through the boom one-way valve. When the boom cylinder is driven to extend, the first electrically-controlled two-position two-way valve of the boom and the third electrically-controlled two-position two-way valve of the boom are in the left position, and the high-pressure hydraulic oil enters the rodless chamber of the boom cylinder through the third electrically-controlled two-position two-way valve of the boom, and the oil in the rod chamber of the boom cylinder flows back to the hydraulic oil tank through the first electrically-controlled two-position two-way valve of the boom. When the boom cylinder is driven to retract, the second electrically-controlled two-position two-way valve of the boom and the fourth electrically-controlled two-position two-way valve of the boom are in the left position, and the high-pressure hydraulic oil enters the rod chamber of the boom cylinder through the second electrically-controlled two-position two-way valve of the boom, and the oil in the rodless chamber of the boom cylinder flows back to the hydraulic oil tank through the fourth electrically-controlled two-position two-way valve of the boom.

[0020] Among them, the fifth electrically controlled two-position two-way valve of the boom is configured to regenerate the energy of the rodless chamber of the boom cylinder to the rod chamber of the boom cylinder, and the sixth electrically controlled two-position two-way valve of the boom is used for hydraulic energy recovery.

[0021] The present invention also provides an electric excavator, comprising any of the above-mentioned distributed electro-hydraulic drive systems based on independent oil replenishment of the boom.

[0022] By adopting the above technical solution, the present invention can achieve the following technical effects: The present application provides a distributed electro-hydraulic drive system and electric excavator based on independent oil replenishment of the bucket rod, which uses four groups of independent motor pumps to supply oil to the actuator through three groups of independent distributed valve groups, which minimizes the pressure coupling loss and throttling loss existing in the original multi-way valve structure and improves energy utilization. The bucket rod adopts two groups of motor pumps to jointly supply oil, and the motor variable pump group is used to supply oil when the bucket rod is in normal operation. The motor quantitative pump group is added to replenish oil in the fast operation condition, which solves the problem of insufficient flow demand of the bucket rod in fast operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of a distributed electro-hydraulic drive system based on independent oil replenishment of a boom according to an embodiment of the present invention.

[0025] Markings in the figure: 1-bucket distributed system components; 2-arm distributed system components; 3-arm distributed system components; 4-hydraulic oil tank; 11-bucket drive motor pump; 12-bucket unloading valve group; 13-bucket distributed valve group; 14-bucket cylinder; 21-arm oil replenishment motor pump; 22-arm drive motor pump; 23-arm first unloading valve group; 24-arm second unloading valve group; 25-arm distributed valve group; 26-arm cylinder; 31-arm drive motor pump; 32-arm unloading valve group; 33 - Distributed valve group of boom; 34- Boom cylinder; 111- Bucket drive motor; 112- Bucket variable pump; 121- Bucket pilot relief valve; 122- Bucket electric control two-position four-way valve; 123- Bucket check valve; 131- Bucket first electric control two-position two-way valve; 132- Bucket second electric control two-position two-way valve; 133- Bucket third electric control two-position two-way valve; 134- Bucket fourth electric control two-position two-way valve; 211- Arm oil replenishment motor; 212- Arm quantitative pump; 221- Arm drive motor; 222- Arm Variable pump; 231-arm first pilot relief valve; 232-arm first electric two-position four-way valve; 233-arm first check valve; 241-arm second pilot relief valve; 242-arm second electric two-position four-way valve; 243-arm second check valve; 251-arm first electric two-position two-way valve; 252-arm second electric two-position two-way valve; 253-arm third electric two-position two-way valve; 254-arm fourth electric two-position two-way valve; 255-arm fifth electric two-position two-way valve; 256-arm sixth Electronically controlled two-position two-way valve; 257-the seventh electronically controlled two-position two-way valve of the boom; 311-the boom drive motor; 312-the boom variable pump; 321-the boom pilot relief valve; 322-the electronically controlled two-position four-way valve of the boom; 323-the boom check valve; 331-the first electronically controlled two-position two-way valve of the boom; 332-the second electronically controlled two-position two-way valve of the boom; 333-the third electronically controlled two-position two-way valve of the boom; 334-the fourth electronically controlled two-position two-way valve of the boom; 335-the fifth electronically controlled two-position two-way valve of the boom; 336-the sixth electronically controlled two-position two-way valve of the boom. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work 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 drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] Example Depend on Figure 1 As shown, an embodiment of the present invention provides a distributed electro-hydraulic drive system based on independent oil replenishment of a boom, comprising a bucket distributed system component 1, a boom distributed system component 2, a boom distributed system component 3 and a hydraulic oil tank 4; the hydraulic oil tank 4 is respectively connected to the bucket distributed system component 1, the boom distributed system component 2, and the boom distributed system component 4.

[0028] Specifically, the bucket distributed system component 1 includes a bucket drive motor pump 11, a bucket unloading valve group 12, a bucket distributed valve group 13, and a bucket cylinder 14; the arm distributed system component 2 includes an arm oil replenishment motor pump 21, an arm drive motor pump 22, an arm first unloading valve group 23, an arm second unloading valve group 24, an arm distributed valve group 25, and an arm cylinder 26; the boom distributed system component 3 includes a boom drive motor pump 31, an arm unloading valve group 32, an arm distributed valve group 33, and an arm cylinder 34.

[0029] Among them, the bucket drive motor pump 11 is connected to the bucket distributed valve group 13; the arm drive motor pump 22 is connected to the arm distributed valve group 25, and the arm oil replenishment motor pump 21 is connected to the arm distributed valve group 25; the boom drive motor pump 31 is connected to the boom distributed valve group 33; each motor pump is connected to each distributed valve group to provide the system with four independent high-pressure working oils.

[0030] Among them, the bucket distributed valve group 13 is connected to the bucket cylinder 14; the arm distributed valve group 25 is connected to the arm cylinder 26; the boom distributed valve group 33 is connected to the boom cylinder 34; and the speed of each working cylinder is controlled by controlling the flow of working oil entering each working cylinder.

[0031] Among them, the bucket unloading valve group 12 is configured at the outlet of the bucket driving motor pump 11; the first boom unloading valve group 23 is configured at the outlet of the boom oil replenishing motor pump 21; the second boom unloading valve group 24 is configured at the outlet of the boom driving motor pump 22; the boom unloading valve group 32 is configured at the outlet of the boom driving motor pump 31; so as to realize the adjustment of the maximum working pressure and unloading function.

[0032] like Figure 1 As shown, in this embodiment, the bucket drive motor pump 11 includes a bucket drive motor 111 and a bucket variable pump 112, the bucket unloading valve group 12 includes a bucket pilot relief valve 121, a bucket electrically controlled two-position four-way valve 122, and a bucket check valve 123, and the bucket distributed valve group 13 includes a bucket first electrically controlled two-position two-way valve 131, a bucket second electrically controlled two-position two-way valve 132, a bucket third electrically controlled two-position two-way valve 133, and a bucket fourth electrically controlled two-position two-way valve 134; Specifically, the bucket drive motor 111 is mechanically connected to the bucket variable pump 112, the input end of the bucket variable pump 112 is connected to the hydraulic oil tank 4, the output end of the bucket variable pump 112 is connected to the inlet of the bucket distributed valve group 13 through the bucket check valve 123, the oil inlet of the bucket pilot relief valve 121 is connected to the outlet of the bucket variable pump 112, the oil outlet of the bucket pilot relief valve 121 is connected to the hydraulic oil tank 4, the bucket electrically controlled two-position four-way valve 122 is connected to the bucket pilot relief valve 121 to control the opening of the bucket pilot relief valve 121, the oil inlet of the bucket first electrically controlled two-position two-way valve 131 is connected to the rodless chamber of the bucket cylinder 14, and the bucket The oil outlet of the first electrically controlled two-position two-way valve 131 is connected to the hydraulic oil tank 4, the oil inlet of the second electrically controlled two-position two-way valve 132 of the bucket is connected to the output end of the bucket variable pump 112, the oil outlet of the second electrically controlled two-position two-way valve 132 of the bucket is connected to the rodless chamber of the bucket cylinder 14, the oil inlet of the third electrically controlled two-position two-way valve 133 of the bucket is connected to the output end of the bucket variable pump 112, the oil outlet of the third electrically controlled two-position two-way valve 133 of the bucket is connected to the rod chamber of the bucket cylinder 14, the oil inlet of the fourth electrically controlled two-position two-way valve 134 of the bucket is connected to the rod chamber of the bucket cylinder 14, and the oil outlet of the fourth electrically controlled two-position two-way valve 134 of the bucket is connected to the hydraulic oil tank 4.

[0033] like Figure 1As shown, in this embodiment, the bucket driving motor pump 11 outputs high-pressure hydraulic oil through the bucket check valve 123 to the inlet of the bucket distributed valve group 13. When the bucket cylinder 14 is driven to extend, the bucket second electrically controlled two-position two-way valve 132 and the bucket fourth electrically controlled two-position two-way valve 134 are in the left position, and the high-pressure hydraulic oil enters the rodless cavity of the bucket cylinder 14 through the bucket second electrically controlled two-position two-way valve 132, and the rod cavity oil of the bucket cylinder 14 passes through the bucket fourth electrically controlled two-position two-way valve 134. The oil in the rodless chamber of the bucket cylinder 14 flows back to the hydraulic oil tank 4 through the first electrically controlled two-position two-way valve 131 of the bucket, and the oil in the rodless chamber of the bucket cylinder 14 flows back to the hydraulic oil tank 4 through the first electrically controlled two-position two-way valve 131 of the bucket, and the bucket cylinder 14 is retracted.

[0034] like Figure 1 As shown, in this embodiment, the arm oil replenishment motor pump 21 includes an arm oil replenishment motor 211 and an arm metering pump 212, the arm drive motor pump 22 includes an arm drive motor 221 and an arm variable pump 222, the arm first unloading valve group 23 includes an arm first pilot relief valve 231, an arm first electric-controlled two-position four-way valve 232, and an arm first check valve 233, and the arm second unloading valve group 24 includes an arm second pilot relief valve 231, an arm first electric-controlled two-position four-way valve 232, and an arm first check valve 233. Valve 241, the second electrically controlled two-position four-way valve 242 of the bucket arm, and the second one-way valve 243 of the bucket arm. The distributed valve group 25 of the bucket arm includes the first electrically controlled two-position two-way valve 251 of the bucket arm, the second electrically controlled two-position two-way valve 252 of the bucket arm, the third electrically controlled two-position two-way valve 253 of the bucket arm, the fourth electrically controlled two-position two-way valve 254 of the bucket arm, the fifth electrically controlled two-position two-way valve 255 of the bucket arm, the sixth electrically controlled two-position two-way valve 256 of the bucket arm, and the seventh electrically controlled two-position two-way valve 257 of the bucket arm.

[0035] Specifically, the arm oil replenishment motor 211 is mechanically connected to the arm metering pump 212, the input end of the arm metering pump 212 is connected to the hydraulic oil tank 4, the output end of the arm metering pump 212 is connected to the inlet of the arm distributed valve group 25 through the arm first one-way valve 233 and the arm seventh electronically controlled two-position two-way valve 257, the arm drive motor 221 is mechanically connected to the arm variable pump 222, the input end of the arm variable pump 222 is connected to the hydraulic oil tank 4, the output end of the arm variable pump 222 is connected to the inlet of the arm distributed valve group 25 through the arm second one-way valve 243, and the oil inlet of the arm first pilot relief valve 231 is connected to the arm distributed valve group 25. The boom metering pump 212 is connected to the outlet, the boom first pilot relief valve 231 oil outlet is connected to the hydraulic oil tank 4, the boom first electrically controlled two-position four-way valve 232 is connected to the boom first pilot relief valve 231, and controls the opening of the boom first pilot relief valve 231, the boom second pilot relief valve 241 oil outlet is connected to the hydraulic oil tank 4, the boom second electrically controlled two-position four-way valve 242 is connected to the boom second pilot relief valve 241, and controls the opening of the boom second pilot relief valve 241, the boom first electrically controlled two-position two-way valve 251 oil inlet is connected to the rodless chamber of the boom cylinder 26, the boom first electrically controlled two-position two-way valve 25 The oil outlet of 1 is connected to the hydraulic oil tank 4, the oil inlet of the second electrically controlled two-position two-way valve 252 of the bucket arm is connected to the output end of the bucket arm variable pump 222, the oil outlet of the second electrically controlled two-position two-way valve 252 of the bucket arm is connected to the rodless chamber of the bucket arm oil cylinder 26, the oil inlet of the third electrically controlled two-position two-way valve 253 of the bucket arm is connected to the output end of the bucket arm variable pump 222, the oil outlet of the third electrically controlled two-position two-way valve 253 of the bucket arm is connected to the rod chamber of the bucket arm oil cylinder 26, the oil inlet of the fourth electrically controlled two-position two-way valve 254 of the bucket arm is connected to the rod chamber of the bucket arm oil cylinder 26, and the oil outlet of the fourth electrically controlled two-position two-way valve 254 of the bucket arm is connected to the hydraulic oil Box 4 is connected, the oil inlet of the fifth electrically controlled two-position two-way valve 255 of the boom is connected to the oil outlet of the third electrically controlled two-position two-way valve 253 of the boom, the oil outlet of the fifth electrically controlled two-position two-way valve 255 of the boom is connected to the oil outlet of the second electrically controlled two-position two-way valve 252 of the boom, the oil inlet of the sixth electrically controlled two-position two-way valve 256 of the boom is connected to the rod chamber of the boom cylinder 26, the oil outlet of the sixth electrically controlled two-position two-way valve 256 of the boom is reserved, the oil inlet of the seventh electrically controlled two-position two-way valve 257 of the boom is connected to the oil outlet of the boom metering pump 212, and the oil outlet of the seventh electrically controlled two-position two-way valve 257 of the boom is connected to the inlet of the boom distributed valve group 25.

[0036] like Figure 1As shown, in this embodiment, when the boom is in normal operating condition, the boom drive motor pump 22 outputs high-pressure hydraulic oil through the boom second one-way valve 243 to the boom distributed valve group 25 inlet. When the boom cylinder 26 is driven to extend, the boom second electrically controlled two-position two-way valve 252 and the boom fourth electrically controlled two-position two-way valve 254 are in the left position, and the high-pressure hydraulic oil enters the rodless chamber of the boom cylinder 26 through the boom second electrically controlled two-position two-way valve 252. The oil in the rod chamber of the cylinder 26 flows back to the hydraulic oil tank 4 through the fourth electrically controlled two-position two-way valve 254 of the boom. When the boom cylinder 26 is driven to retract, the first electrically controlled two-position two-way valve 251 of the boom and the third electrically controlled two-position two-way valve 253 of the boom are in the left position, and the high-pressure hydraulic oil enters the rod chamber of the boom cylinder 26 through the third electrically controlled two-position two-way valve 253 of the boom, and the oil in the rodless chamber of the boom cylinder 26 flows back to the hydraulic oil tank 4 through the first electrically controlled two-position two-way valve 251 of the boom.

[0037] Specifically, when the boom cylinder 26 is in a fast-running condition, the high-pressure hydraulic oil provided by the boom drive motor pump 22 cannot meet the boom's large flow demand. At this time, the boom's seventh electrically-controlled two-position two-way valve 257 is in the left position, and the boom's oil replenishment motor 211 drives the boom's metering pump 212 at a certain speed to output high-pressure hydraulic oil through the boom's seventh electrically-controlled two-position two-way valve 257 into the boom's distributed valve group 25. The boom's oil replenishment motor pump 21 and the boom drive motor pump 22 work simultaneously to solve the problem of large flow demand when the boom is running quickly.

[0038] Among them, the fifth electrically controlled two-position two-way valve 255 of the boom is configured to regenerate the energy of the rod chamber of the boom cylinder 26 to the rodless chamber of the boom cylinder 26, and the sixth electrically controlled two-position two-way valve 256 of the boom is used for hydraulic energy recovery.

[0039] like Figure 1 As shown, in the present embodiment, the boom drive motor pump 31 includes a boom drive motor 311 and a boom variable pump 312, the boom unloading valve group 32 includes a boom pilot relief valve 321, a boom electrically controlled two-position four-way valve 322, and a boom check valve 323, and the boom distributed valve group 33 includes a boom first electrically controlled two-position two-way valve 331, a boom second electrically controlled two-position two-way valve 332, a boom third electrically controlled two-position two-way valve 333, a boom fourth electrically controlled two-position two-way valve 334, a boom fifth electrically controlled two-position two-way valve 335, and a boom sixth electrically controlled two-position two-way valve 336.

[0040] Specifically, the boom drive motor 311 is mechanically connected to the boom variable pump 312, the input end of the boom variable pump 312 is connected to the hydraulic oil tank 4, the output end of the boom variable pump 312 is connected to the inlet of the boom distributed valve group 33, the oil inlet of the boom pilot relief valve 321 is connected to the outlet of the boom variable pump 312, the oil outlet of the boom pilot relief valve 321 is connected to the hydraulic oil tank 4, and the boom electric control two-position four-way valve 322 is connected to the boom pilot relief valve 321 to control the opening of the boom pilot relief valve 321. The oil inlet of the boom first electrically controlled two-position two-way valve 331 is connected to the rod chamber of the boom cylinder 34. The oil outlet of the boom first electrically controlled two-position two-way valve 331 is connected to the hydraulic oil tank 4. The oil inlet of the boom second electrically controlled two-position two-way valve 332 is connected to the output end of the boom variable pump 312. The oil outlet of the boom oil cylinder 34 is connected to the rod chamber of the boom oil cylinder 34, the oil inlet of the third electric-controlled two-position two-way valve 333 of the boom is connected to the output end of the boom variable pump 312, the oil outlet of the third electric-controlled two-position two-way valve 333 of the boom is connected to the rodless chamber of the boom oil cylinder 34, the oil inlet of the fourth electric-controlled two-position two-way valve 334 of the boom is connected to the rodless chamber of the boom oil cylinder 34, and the oil outlet of the fourth electric-controlled two-position two-way valve 334 of the boom is connected to the rodless chamber of the boom oil cylinder 34. The hydraulic oil tank 4 is connected, the oil inlet of the fifth electrically controlled two-position two-way valve 335 of the boom is connected to the oil outlet of the third electrically controlled two-position two-way valve 333 of the boom, the oil outlet of the fifth electrically controlled two-position two-way valve 335 of the boom is connected to the oil outlet of the second electrically controlled two-position two-way valve 332 of the boom, the oil inlet of the sixth electrically controlled two-position two-way valve 336 of the boom is connected to the rodless chamber of the boom cylinder 34, and the oil outlet of the sixth electrically controlled two-position two-way valve 336 of the boom is reserved.

[0041] like Figure 1 As shown, in this embodiment, the boom drive motor pump 31 outputs high-pressure hydraulic oil through the boom check valve 323 to the inlet of the boom distributed valve group 33. When the boom cylinder 34 is driven to extend, the first electrically controlled two-position two-way valve 331 of the boom and the third electrically controlled two-position two-way valve 333 of the boom are in the left position, and the high-pressure hydraulic oil enters the rodless chamber of the boom cylinder 34 through the third electrically controlled two-position two-way valve 333 of the boom, and the boom cylinder 34 has a rod chamber. The oil flows back to the hydraulic oil tank through the first electrically controlled two-position two-way valve 331 of the boom. When the boom cylinder 34 is driven to retract, the second electrically controlled two-position two-way valve 332 of the boom and the fourth electrically controlled two-position two-way valve 334 of the boom are in the left position, and the high-pressure hydraulic oil enters the rod chamber of the boom cylinder 34 through the second electrically controlled two-position two-way valve 332 of the boom, and the oil in the rodless chamber of the boom cylinder 34 flows back to the hydraulic oil tank through the fourth electrically controlled two-position two-way valve 334 of the boom.

[0042] Specifically, the fifth electrically controlled two-position two-way valve 335 of the boom is configured to regenerate the energy of the rodless chamber of the boom cylinder 34 to the rod chamber of the boom cylinder 34, and the sixth electrically controlled two-position two-way valve 336 of the boom is used for hydraulic energy recovery.

[0043] In addition, the present application also provides an electric excavator, including the above-mentioned distributed electro-hydraulic drive system based on independent oil replenishment of the boom. Four groups of independent motor pumps are used to supply oil to the actuator through three groups of independent distributed valve groups, which minimizes the pressure coupling loss and throttling loss existing in the original multi-way valve structure and improves energy utilization. Among them, the boom adopts two groups of motor pumps, the boom drive motor pump 22 and the boom replenishment motor pump 21, to jointly supply oil. When the boom is in normal operation, a combination of a motor and a variable pump is used for oil supply. In the fast operation condition, a combination of a motor and a fixed displacement pump is added for oil replenishment, which solves the problem of insufficient flow demand for the boom during fast operation.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distributed electro-hydraulic drive system based on independent oil replenishment of the bucket arm, characterized in that: include: A bucket distributed system component, a stick distributed system component, a boom distributed system component and a hydraulic oil tank; the hydraulic oil tank is connected to the bucket distributed system component, the stick distributed system component and the boom distributed system component respectively; The bucket distributed system components include a bucket drive motor pump, a bucket unloading valve group, a bucket distributed valve group, and a bucket cylinder; the arm distributed system components include an arm oil replenishment motor pump, an arm drive motor pump, an arm first unloading valve group, an arm second unloading valve group, an arm distributed valve group, and an arm cylinder; the boom distributed system components include an arm drive motor pump, an arm unloading valve group, an arm distributed valve group, and an arm cylinder; The bucket drive motor pump is connected to the bucket distributed valve group; the arm drive motor pump is connected to the arm distributed valve group, the arm oil replenishment motor pump is connected to the arm distributed valve group; the boom drive motor pump is connected to the boom distributed valve group; thereby providing the system with four independent high-pressure working oils; The bucket distributed valve group is connected to the bucket cylinder; the arm distributed valve group is connected to the arm cylinder; the boom distributed valve group is connected to the boom cylinder; the speed of each working cylinder is controlled by controlling the flow of working oil entering each working cylinder; The bucket unloading valve group is arranged at the outlet of the bucket driving motor pump; the arm first unloading valve group is arranged at the outlet of the arm oil replenishing motor pump; The second boom unloading valve group is arranged at the outlet of the boom driving motor pump; the boom unloading valve group is arranged at the outlet of the boom driving motor pump; so as to realize the adjustment of the maximum working pressure and the unloading function.

2. The distributed electro-hydraulic drive system based on independent oil replenishment of the boom according to claim 1 is characterized in that: The bucket drive motor pump includes a bucket drive motor and a bucket variable pump, the bucket unloading valve group includes a bucket pilot relief valve, a bucket electrically controlled two-position four-way valve, and a bucket check valve, and the bucket distributed valve group includes a bucket first electrically controlled two-position two-way valve, a bucket second electrically controlled two-position two-way valve, a bucket third electrically controlled two-position two-way valve, and a bucket fourth electrically controlled two-position two-way valve; Among them, the bucket drive motor is mechanically connected to the bucket variable pump, the bucket variable pump input end is connected to the hydraulic oil tank, the bucket variable pump output end is connected to the bucket distributed valve group inlet through the bucket check valve, the bucket pilot relief valve oil inlet is connected to the bucket variable pump outlet, the bucket pilot relief valve oil outlet is connected to the hydraulic oil tank, the bucket electronically controlled two-position four-way valve is connected to the bucket pilot relief valve to control the opening of the bucket pilot relief valve, the oil inlet of the bucket first electronically controlled two-position two-way valve is connected to the rodless chamber of the bucket cylinder, and the bucket first electronically controlled The oil outlet of the two-position two-way valve is connected to the hydraulic oil tank, the oil inlet of the second electrically controlled two-position two-way valve of the bucket is connected to the output end of the bucket variable pump, the oil outlet of the second electrically controlled two-position two-way valve of the bucket is connected to the rodless chamber of the bucket cylinder, the oil inlet of the third electrically controlled two-position two-way valve of the bucket is connected to the output end of the bucket variable pump, the oil outlet of the third electrically controlled two-position two-way valve of the bucket is connected to the rod chamber of the bucket cylinder, the oil inlet of the fourth electrically controlled two-position two-way valve of the bucket is connected to the rod chamber of the bucket cylinder, and the oil outlet of the fourth electrically controlled two-position two-way valve of the bucket is connected to the hydraulic oil tank.

3. The distributed electro-hydraulic drive system based on independent oil replenishment of the bucket arm according to claim 2 is characterized in that: The bucket drive motor pump outputs high-pressure hydraulic oil that reaches the inlet of the bucket distributed valve group through the bucket one-way valve. When the bucket cylinder is driven to extend, the bucket's second electrically controlled two-position two-way valve and the bucket's fourth electrically controlled two-position two-way valve are in the left position, and the high-pressure hydraulic oil enters the rodless chamber of the bucket cylinder through the bucket's second electrically controlled two-position two-way valve, and the oil in the rod chamber of the bucket cylinder flows back to the hydraulic oil tank through the bucket's fourth electrically controlled two-position two-way valve, so that the bucket cylinder is extended. When the bucket cylinder is driven to retract, the bucket's first electrically controlled two-position two-way valve and the bucket's third electrically controlled two-position two-way valve are in the left position, and the high-pressure hydraulic oil enters the rod chamber of the bucket cylinder through the bucket's third electrically controlled two-position two-way valve, and the oil in the rodless chamber of the bucket cylinder flows back to the hydraulic oil tank through the bucket's first electrically controlled two-position two-way valve, so that the bucket cylinder is retracted.

4. The distributed electro-hydraulic drive system based on independent oil replenishment of the bucket arm according to claim 1 is characterized in that: The arm oil replenishment motor pump includes an arm oil replenishment motor and an arm metering pump, the arm drive motor pump includes an arm drive motor and an arm variable pump, the arm first unloading valve group includes an arm first pilot relief valve, an arm first electrically controlled two-position four-way valve, and an arm first check valve, the arm second unloading valve group includes an arm second pilot relief valve, an arm second electrically controlled two-position four-way valve, and an arm second check valve, the arm distributed valve group includes an arm first electrically controlled two-position two-way valve, an arm second electrically controlled two-position two-way valve, an arm third electrically controlled two-position two-way valve, an arm fourth electrically controlled two-position two-way valve, an arm fifth electrically controlled two-position two-way valve, an arm sixth electrically controlled two-position two-way valve, and an arm seventh electrically controlled two-position two-way valve; Among them, the boom oil replenishment motor is mechanically connected to the boom metering pump, the boom metering pump input end is connected to the hydraulic oil tank, the boom metering pump output end is connected to the boom distributed valve group inlet through the boom first one-way valve and the boom seventh electronically controlled two-position two-way valve, the boom drive motor is mechanically connected to the boom variable pump, the boom variable pump input end is connected to the hydraulic oil tank, the boom variable pump output end is connected to the boom distributed valve group inlet through the boom second one-way valve, the boom first pilot relief valve oil inlet is connected to the boom metering The pump outlet is connected, the oil outlet of the first pilot relief valve of the boom is connected to the hydraulic oil tank, the first electrically controlled two-position four-way valve of the boom is connected to the first pilot relief valve of the boom to control the opening of the first pilot relief valve of the boom, the oil outlet of the second pilot relief valve of the boom is connected to the hydraulic oil tank, the second electrically controlled two-position four-way valve of the boom is connected to the second pilot relief valve of the boom to control the opening of the second pilot relief valve of the boom, the oil inlet of the first electrically controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, and the oil outlet of the first electrically controlled two-position two-way valve of the boom is connected to the The oil inlet of the second electrically controlled two-position two-way valve of the bucket arm is connected to the output end of the bucket arm variable pump, the oil outlet of the second electrically controlled two-position two-way valve of the bucket arm is connected to the rodless chamber of the bucket arm oil cylinder, the oil inlet of the third electrically controlled two-position two-way valve of the bucket arm is connected to the output end of the bucket arm variable pump, the oil outlet of the third electrically controlled two-position two-way valve of the bucket arm is connected to the rod chamber of the bucket arm oil cylinder, the oil inlet of the fourth electrically controlled two-position two-way valve of the bucket arm is connected to the rod chamber of the bucket arm oil cylinder, and the oil outlet of the fourth electrically controlled two-position two-way valve of the bucket arm is connected to the hydraulic oil tank. The oil inlet of the fifth electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the third electrically controlled two-position two-way valve of the boom, the oil outlet of the fifth electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the second electrically controlled two-position two-way valve of the boom, the oil inlet of the sixth electrically controlled two-position two-way valve of the boom is connected to the rod chamber of the boom cylinder, the oil outlet of the sixth electrically controlled two-position two-way valve of the boom is reserved, the oil inlet of the seventh electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the boom metering pump, and the oil outlet of the seventh electrically controlled two-position two-way valve of the boom is connected to the inlet of the boom distributed valve group.

5. The distributed electro-hydraulic drive system based on independent oil replenishment of the boom according to claim 4 is characterized in that: When the boom is in normal operating condition, the boom drive motor pump outputs high-pressure hydraulic oil through the second one-way valve of the boom to the inlet of the boom distributed valve group. When the boom cylinder is driven to extend, the second electrically controlled two-position two-way valve of the boom and the fourth electrically controlled two-position two-way valve of the boom are in the left position, and the high-pressure hydraulic oil enters the rodless chamber of the boom cylinder through the second electrically controlled two-position two-way valve of the boom, and the oil in the rod chamber of the boom cylinder flows back to the hydraulic oil tank through the fourth electrically controlled two-position two-way valve of the boom. When the boom cylinder is driven to retract, the first electrically controlled two-position two-way valve of the boom and the third electrically controlled two-position two-way valve of the boom are in the left position, and the high-pressure hydraulic oil enters the rod chamber of the boom cylinder through the third electrically controlled two-position two-way valve of the boom, and the oil in the rodless chamber of the boom cylinder flows back to the hydraulic oil tank through the first electrically controlled two-position two-way valve of the boom. When the boom cylinder is in a fast-running condition, the high-pressure hydraulic oil provided by the boom drive motor pump cannot meet the boom's large flow demand. At this time, the boom's seventh electrically-controlled two-position two-way valve is in the left position, and the boom's oil replenishment motor drives the boom's quantitative pump to output high-pressure hydraulic oil through the boom's seventh electrically-controlled two-position two-way valve into the boom's distributed valve group. The boom's oil replenishment motor pump and the boom drive motor pump work simultaneously, solving the problem of large flow demand when the boom is running quickly. Among them, the fifth electrically controlled two-position two-way valve of the boom is configured to regenerate the energy of the rod chamber of the boom cylinder to the rodless chamber of the boom cylinder, and the sixth electrically controlled two-position two-way valve of the boom is used for hydraulic energy recovery.

6. The distributed electro-hydraulic drive system based on independent oil replenishment of the boom according to claim 1 is characterized in that: The boom drive motor pump includes a boom drive motor and a boom variable pump, the boom unloading valve group includes a boom pilot relief valve, an boom electrically controlled two-position four-way valve, and a boom check valve, and the boom distributed valve group includes a boom first electrically controlled two-position two-way valve, a boom second electrically controlled two-position two-way valve, a boom third electrically controlled two-position two-way valve, a boom fourth electrically controlled two-position two-way valve, a boom fifth electrically controlled two-position two-way valve, and a boom sixth electrically controlled two-position two-way valve; Wherein, the boom drive motor is mechanically connected to the boom variable pump, the boom variable pump input end is connected to the hydraulic oil tank, the boom variable pump output end is connected to the boom distributed valve assembly inlet, the boom pilot relief valve oil inlet is connected to the boom variable pump outlet, the boom pilot relief valve oil outlet is connected to the hydraulic oil tank, the boom electrically controlled two-position four-way valve is connected to the boom pilot relief valve to control the opening of the boom pilot relief valve, the oil inlet of the boom first electrically controlled two-position two-way valve is connected to the rod chamber of the boom cylinder, the oil outlet of the boom first electrically controlled two-position two-way valve is connected to the hydraulic oil tank, the oil inlet of the boom second electrically controlled two-position two-way valve is connected to the output end of the boom variable pump, the oil outlet of the boom second electrically controlled two-position two-way valve It is connected to the rod chamber of the boom cylinder, the oil inlet of the third electrically-controlled two-position two-way valve of the boom is connected to the output end of the boom variable pump, the oil outlet of the third electrically-controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, the oil inlet of the fourth electrically-controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, the oil outlet of the fourth electrically-controlled two-position two-way valve of the boom is connected to the hydraulic oil tank, the oil inlet of the fifth electrically-controlled two-position two-way valve of the boom is connected to the oil outlet of the third electrically-controlled two-position two-way valve of the boom, the oil outlet of the fifth electrically-controlled two-position two-way valve of the boom is connected to the oil outlet of the second electrically-controlled two-position two-way valve of the boom, the oil inlet of the sixth electrically-controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, and the oil outlet of the sixth electrically-controlled two-position two-way valve of the boom is reserved.

7. The distributed electro-hydraulic drive system based on independent oil replenishment of the boom according to claim 6 is characterized in that: The boom drive motor pump outputs high-pressure hydraulic oil that reaches the inlet of the boom distributed valve group through the boom one-way valve. When the boom cylinder is driven to extend, the first electrically controlled two-position two-way valve of the boom and the third electrically controlled two-position two-way valve of the boom are in the left position, and the high-pressure hydraulic oil enters the rodless chamber of the boom cylinder through the third electrically controlled two-position two-way valve of the boom, and the oil in the rod chamber of the boom cylinder flows back to the hydraulic oil tank through the first electrically controlled two-position two-way valve of the boom. When the boom cylinder is driven to retract, the second electrically controlled two-position two-way valve of the boom and the fourth electrically controlled two-position two-way valve of the bucket rod are in the left position, and the high-pressure hydraulic oil enters the rod chamber of the boom cylinder through the second electrically controlled two-position two-way valve of the boom, and the oil in the rodless chamber of the boom cylinder flows back to the hydraulic oil tank through the fourth electrically controlled two-position two-way valve of the boom; Among them, the fifth electrically controlled two-position two-way valve of the boom is configured to regenerate the energy of the rodless chamber of the boom cylinder to the rod chamber of the boom cylinder, and the sixth electrically controlled two-position two-way valve of the boom is used for hydraulic energy recovery.

8. An electric excavator, characterized in that: It includes a distributed electro-hydraulic drive system based on independent oil replenishment of the boom as described in any one of claims 1-7.

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