Distributed pump valve composite electro-hydraulic independent driving system and excavator

Abstract

The invention discloses a distributed pump valve composite electro-hydraulic independent driving system and an excavator. The distributed pump valve composite electro-hydraulic independent driving system comprises a driving motor-pump assembly, an unloading valve assembly, a flow dividing and collecting valve assembly, a distributed valve assembly, an actuator assembly and a hydraulic oil tank. Wherein the driving motor-pump assembly comprises a bucket motor pump, a bucket rod motor pump and a movable arm motor pump, and the unloading valve assembly comprises a bucket unloading valve set, a bucket rod unloading valve set and a movable arm unloading valve set. The flow dividing and collecting valve assembly comprises a bucket electric control three-position three-way proportional reversing valve, a movable arm electric control three-position three-way proportional reversing valve, a first one-way valve and a second one-way valve, and the distributed valve assembly comprises a bucket distributed valve set, a bucket rod distributed valve set and a movable arm distributed valve set. The actuator assembly comprises a bucket oil cylinder, a bucket rod oil cylinder and a movable arm oil cylinder.

Description

Technical Field

[0001] The invention relates to the field of engineering machinery system structure, and in particular to a high-efficiency and energy-saving pump-valve composite electro-hydraulic independent drive system and an electric excavator based on the confluence of a bucket pump and a boom pump to a bucket arm. Background Art

[0002] The energy source of the current electric excavator hydraulic system is to drive a single pump or a dual pump through a single or two motors to output high-pressure hydraulic oil to a multi-way valve, and the multi-way valve then distributes the high-pressure hydraulic oil to each actuator. During the operation of the excavator, the loads faced by each actuator are different. For example, the boom cylinder extends due to resistance when lifting and retracts due to overrun when lowering. The load of the dipper cylinder has a four-quadrant characteristic, while the bucket cylinder is mainly load-bearing with resistance. This makes the pressure-flow characteristics of each actuator different, resulting in a large amount of pressure coupling when the multi-way valve distributes the flow, which inevitably generates a large amount of energy loss such as oil inlet throttling loss, oil return throttling loss, and bypass throttling return oil loss, making the energy efficiency of the entire hydraulic system low. This is also the fundamental reason for the high energy consumption of current electric excavators. Even if the whole machine is equipped with a large-capacity battery, it still cannot solve the pain point of short battery life. Summary of the invention

[0003] In view of this, the present invention is directed to the deficiencies of the prior art in the background technology, and its main purpose is to.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a distributed pump-valve composite electro-hydraulic independent drive system, comprising: a drive motor-pump assembly, an unloading valve assembly, a flow-dividing and converging valve assembly, a distributed valve assembly, an actuator assembly, and a hydraulic oil tank; Wherein, the driving motor-pump assembly includes a bucket motor pump, a stick motor pump and a boom motor pump, the unloading valve assembly includes a bucket unloading valve group, a stick unloading valve group and a boom unloading valve group, the flow dividing and converging valve assembly includes a bucket electrically controlled three-position three-way proportional reversing valve, a boom electrically controlled three-position three-way proportional reversing valve and a first non-return valve and a second non-return valve, the distributed valve assembly includes a bucket distributed valve group, a stick distributed valve group and a boom distributed valve group, and the actuator assembly includes a bucket oil cylinder, a stick oil cylinder and a boom oil cylinder; The drive motor-pump assembly is connected to the diverter and merger valve assembly to provide the system with three independent high-pressure working oils. The diverter and merger valve assembly is connected to the distributed valve group to deliver the three high-pressure oils that have been diverted and merged to the distributed valve group. The distributed valve group is connected to the actuator assembly and controls the flow of working oil entering each actuator to control the speed of each actuator. The unloading valve assembly is arranged at the outlet of the drive motor-pump assembly to adjust the maximum working pressure and unloading function of each drive motor-pump assembly.

[0005] Preferably, the bucket motor pump includes a bucket drive motor and a bucket variable pump, the bucket drive motor is mechanically connected to the bucket variable pump, the oil inlet of the bucket variable pump is connected to the hydraulic oil tank, and the oil outlet of the bucket variable pump is connected to the inlet of the bucket distributed valve assembly; the boom motor pump includes a boom drive motor and a boom variable pump, the boom drive motor is mechanically connected to the boom variable pump, the oil inlet of the boom variable pump is connected to the hydraulic oil tank, and the oil outlet of the boom variable pump is connected to the inlet of the boom distributed valve assembly; the boom motor pump includes a boom drive motor and a boom variable pump, the boom drive motor is mechanically connected to the boom variable pump, the oil inlet of the boom variable pump is connected to the hydraulic oil tank, and the oil outlet of the boom variable pump is connected to the inlet of the boom distributed valve assembly.

[0006] Preferably, the bucket unloading valve group includes a bucket pilot relief valve, a bucket two-position four-way solenoid valve and a bucket check valve, the arm unloading valve group includes an arm pilot relief valve, an arm two-position four-way solenoid valve and an arm check valve, and the boom unloading valve group includes an arm pilot relief valve, an arm electrically controlled two-position four-way solenoid valve and an arm check valve; Among them, the oil inlet of each pilot relief valve is connected to the outlet of each corresponding variable pump, the oil outlet of each pilot relief valve is connected to the hydraulic oil tank, each two-position four-way solenoid valve is connected to each pilot relief valve to adjust the relief pressure of each pilot relief valve, and each check valve is arranged at the corresponding variable pump oil outlet to prevent the system working hydraulic oil from flowing back.

[0007] Preferably, the oil inlet of the bucket electrically controlled three-position three-way proportional reversing valve is connected to the oil outlet of the bucket variable pump, the first oil outlet of the bucket electrically controlled three-position three-way proportional reversing valve is connected to the oil inlet of the bucket distributed valve group, the second oil outlet of the bucket electrically controlled three-position three-way proportional reversing valve is connected in parallel to the oil inlet of the boom distributed valve group after passing through the first one-way valve, the oil inlet of the boom electrically controlled three-position three-way proportional reversing valve is connected to the oil outlet of the boom variable pump, the first oil outlet of the boom electrically controlled three-position three-way proportional reversing valve is connected to the oil inlet of the boom distributed valve group, and the second oil outlet of the boom electrically controlled three-position three-way proportional reversing valve is connected in parallel to the oil inlet of the boom distributed valve group after passing through the second one-way valve; Under normal working conditions, the oil inlet of the bucket electrically controlled three-position three-way proportional reversing valve is connected to the first oil outlet, the oil outlet of the boom electrically controlled three-position three-way proportional reversing valve is connected to the first oil outlet, and the bucket cylinder, the arm cylinder and the boom cylinder are independently driven by the corresponding three motor pumps; Under the condition of rapid operation of the boom, the oil inlet of the bucket's electronically controlled three-position three-way proportional directional valve is controlled to be connected to the second oil outlet, and the oil inlet of the boom's electronically controlled three-position three-way proportional directional valve is controlled to be connected to the second oil outlet, so as to select the bucket variable pump or the boom variable pump to provide working oil to the boom drive circuit through the diverter and merger valve assembly according to the working conditions.

[0008] Preferably, the bucket distributed valve group includes a first electrically controlled two-position two-way valve for the bucket, a second electrically controlled two-position two-way valve for the bucket, a third electrically controlled two-position two-way valve for the bucket, and a fourth electrically controlled two-position two-way valve for the bucket. The oil inlet of the first electrically controlled two-position two-way valve for the bucket is connected to the rodless chamber of the bucket cylinder, the oil outlet of the first electrically controlled two-position two-way valve for the bucket is connected to the hydraulic oil tank, and the oil inlet of the second electrically controlled two-position two-way valve for the bucket is connected to the oil outlet of the 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 oil outlet of the 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; When the first electrically controlled two-position two-way valve of the bucket and the third electrically controlled two-position two-way valve of the bucket are energized, the hydraulic oil enters the rod chamber of the bucket cylinder through the third electrically controlled two-position two-way valve of the bucket, and the hydraulic oil in the rodless chamber of the bucket cylinder flows back to the hydraulic oil tank through the first electrically controlled two-position two-way valve of the bucket, so that the piston rod of the bucket cylinder is retracted. When the second electrically controlled two-position two-way valve of the bucket and the fourth electrically controlled two-position two-way valve of the bucket are energized, the hydraulic oil enters the rodless chamber of the bucket cylinder through the second electrically controlled two-position two-way valve of the bucket, and the hydraulic oil in the rod chamber of the bucket cylinder flows back to the hydraulic oil tank through the fourth electrically controlled two-position two-way valve of the bucket, so that the piston rod of the bucket cylinder is extended.

[0009] Preferably, the boom distributed valve group includes a first electrically controlled two-position two-way valve of the boom, a second electrically controlled two-position two-way valve of the boom, a third electrically controlled two-position two-way valve of the boom, a fourth electrically controlled two-position two-way valve of the boom, a fifth electrically controlled two-position two-way valve of the boom, and a sixth electrically controlled two-position two-way valve of the boom, the oil inlet of the first electrically controlled two-position two-way valve of the boom being connected to the rodless chamber of the boom cylinder, the oil outlet of the first electrically controlled two-position two-way valve of the boom being connected to the hydraulic oil tank, the oil inlet of the second electrically controlled two-position two-way valve of the boom being connected to the oil outlet of the boom variable pump, the oil outlet of the second electrically controlled two-position two-way valve of the boom being connected to the rodless chamber of the boom cylinder, and the oil inlet of the third electrically controlled two-position two-way valve of the boom being connected to the outlet of the boom variable pump The oil port is connected, 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 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 cylinder, 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 bucket arm is connected to the oil outlet of the third electrically controlled two-position two-way valve of the bucket arm, the oil outlet of the fifth electrically controlled two-position two-way valve of the bucket arm is connected to the oil outlet of the second electrically controlled two-position two-way valve of the bucket arm, the oil inlet of the sixth electrically controlled two-position two-way valve of the bucket arm is connected to the rod chamber of the bucket arm cylinder, and the oil outlet of the sixth electrically controlled two-position two-way valve of the bucket arm can be configured to be connected to an external hydraulic energy recovery system; When 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 energized, the 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 hydraulic 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, so that the piston rod of the boom cylinder is retracted. When 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 energized, the 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 hydraulic 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, so that the piston rod of the boom cylinder is extended. 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; The sixth electrically controlled two-position two-way valve of the bucket rod is used to recover the return oil hydraulic energy of the rod chamber when the bucket cylinder is overextended.

[0010] Preferably, the boom distributed valve group includes a first electrically controlled two-position two-way valve of the boom, a second electrically controlled two-position two-way valve of the boom, a third electrically controlled two-position two-way valve of the boom, a fourth electrically controlled two-position two-way valve of the boom, a fifth electrically controlled two-position two-way valve of the boom, and a sixth electrically controlled two-position two-way valve of the boom, the oil inlet of the first electrically controlled two-position two-way valve of the boom being connected to the rod chamber of the boom cylinder, the oil outlet of the first electrically controlled two-position two-way valve of the boom being connected to the hydraulic oil tank, the oil inlet of the second electrically controlled two-position two-way valve of the boom being connected to the oil outlet of the boom variable pump, the oil outlet of the second electrically controlled two-position two-way valve of the boom being 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 being connected to the outlet of the boom variable pump The oil port 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, 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 can be configured to be connected to an external hydraulic energy recovery system; When 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 energized, the 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 hydraulic 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, so that the boom cylinder piston rod is extended. When 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 energized, the 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 hydraulic 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, so that the boom cylinder piston rod is retracted. 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; Among them, the sixth electrically controlled two-position two-way valve of the boom is used for hydraulic energy recovery of the return oil hydraulic energy of the rodless chamber when the boom cylinder exceeds and retracts.

[0011] An electric excavator device comprises the distributed pump-valve composite electro-hydraulic independent drive system as described above.

[0012] The present invention has the following beneficial effects: the distributed pump-valve composite electro-hydraulic independent drive system and its electric excavator provided by the present invention, the independent drive motor-variable pump assembly supplies oil to each actuator through each independent distributed valve assembly, realizes independent drive of each actuator, reduces energy losses such as oil inlet throttling loss, oil return throttling loss and bypass oil return loss, and improves the energy utilization rate of the hydraulic system, wherein the diversion and converging valves arranged at the inlet ends of the bucket distributed valve assembly and the boom distributed valve assembly realize the confluence of the bucket pump and the boom pump to the boom drive circuit, solves the problem of insufficient oil supply when the boom cylinder has a large flow demand, each independent oil supply system is provided with the unloading valve assembly to play an overflow protection role, the boom fifth electrically controlled two-position two-way valve is connected to the two chambers of the boom cylinder, the boom fifth electrically controlled two-position two-way valve is connected to the two chambers of the boom cylinder, realizes the return oil energy regeneration of the boom and the boom, and generally reduces the energy consumption of the whole machine. In addition, the system is also equipped with an energy recovery interface, which can be used to recover the kinetic energy of the bucket and boom, further improving the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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 a technician in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 It is a schematic diagram of the structure of the distributed pump-valve composite electro-hydraulic independent drive system of the present invention.

[0015] In the figure: 1-driving motor-pump assembly; 2-unloading valve assembly; 3-dividing and converging valve assembly; 4-distributed valve assembly; 5-actuator assembly; 6-hydraulic oil tank; 11-bucket driving motor; 12-bucket variable pump; 13-arm driving motor; 14-arm variable pump; 15-boom driving motor; 16-arm variable pump; 21-bucket unloading valve group; 22-arm unloading valve group; 23-boom unloading valve group; 31-bucket electric control three-way Proportional reversing valve; 32- three-way proportional reversing valve with electric control of boom; 33- first check valve; 34- second check valve; 41- distributed valve group of bucket; 42- distributed valve group of bucket rod; 43- distributed valve group of boom; 51- bucket cylinder; 52- bucket cylinder; 53- boom cylinder; 211- bucket pilot relief valve; 212- two-position four-way valve with electric control of bucket; 213- bucket check valve; 221- bucket rod pilot relief valve; 222- bucket rod electric control Two-position four-way valve; 223-arm check valve; 231-boom pilot relief valve; 232-boom electric two-position four-way valve; 233-boom check valve; 411-bucket first electric two-position two-way valve; 412-bucket second electric two-position two-way valve; 413-bucket third electric two-position two-way valve; 414-bucket fourth electric two-position two-way valve; 421-arm first electric two-position two-way valve; 422-arm second electric two-position two-way valve; 423-bucket The third electrically controlled two-position two-way valve; 424-the fourth electrically controlled two-position two-way valve of the boom; 425-the fifth electrically controlled two-position two-way valve of the boom; 426-the sixth electrically controlled two-position two-way valve of the boom; 431-the first electrically controlled two-position two-way valve of the boom; 432-the second electrically controlled two-position two-way valve of the boom; 433-the third electrically controlled two-position two-way valve of the boom; 434-the fourth electrically controlled two-position two-way valve of the boom; 435-the fifth electrically controlled two-position two-way valve of the boom; 436-the sixth electrically controlled two-position two-way valve of the boom. DETAILED DESCRIPTION

[0016] 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, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by the first technician in the field without making creative work belong to 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 the first technician in the field without making creative work belong to the scope of protection of the present invention.

[0017] Example The following are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the following embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0018] The present invention provides a distributed pump valve composite electro-hydraulic independent drive system. Figure 1 , including: a driving motor-pump assembly 1, an unloading valve assembly 2, a flow dividing and converging valve assembly 3, a distributed valve assembly 4, an actuator assembly 5, and a hydraulic oil tank 6; The drive motor-pump assembly 1 includes a bucket motor pump, an arm motor pump, and a boom motor pump; the unloading valve assembly 2 includes a bucket unloading valve group 21, an arm unloading valve group 22, and an arm unloading valve group 23; the distributed valve assembly 3 includes a bucket distributed valve group 41, an arm distributed valve group 42, and an arm distributed valve group 43; the actuator assembly includes a bucket cylinder 51, an arm cylinder 52, and an arm cylinder 53; The driving motor-pump assembly 1 is connected to the diverter and merger valve assembly 3 to provide the system with three independent high-pressure working oils. The diverter and merger valve assembly 3 is connected to the distributed valve group 4 to transport the three high-pressure oils that have been diverted and merged to the distributed valve group 4. The distributed valve assembly 4 is connected to the actuator assembly 5 to control the working oil flow entering each actuator to control the speed of each actuator. The unloading valve assembly 2 is arranged at the outlet of the driving motor-pump assembly 1 to achieve the adjustment of the maximum working pressure and unloading functions. Reference Manual Attached Figure 1 As shown, in this embodiment, the bucket motor pump includes a bucket drive motor 11 and a bucket variable pump 12, the arm motor pump includes an arm drive motor 13 and an arm variable pump 14, and the boom motor pump includes an arm drive motor 15 and an arm variable pump 16. The bucket drive motor 11 is mechanically connected to the bucket variable pump 12, the oil inlet of the bucket variable pump 12 is connected to the hydraulic oil tank 6, and the oil outlet of the bucket variable pump 12 is connected to the inlet of the bucket distributed valve assembly 41. The arm drive motor 13 is mechanically connected to the arm variable pump 14, the oil inlet of the arm variable pump 14 is connected to the hydraulic oil tank 6, and the oil outlet of the arm variable pump 14 is connected to the inlet of the arm distributed valve assembly 42. The boom drive motor 15 is mechanically connected to the boom variable pump 16, the oil inlet of the boom variable pump 16 is connected to the hydraulic oil tank 6, and the oil outlet of the boom variable pump 16 is connected to the inlet of the boom distributed valve assembly 43.

[0019] Reference Manual Attached Figure 1As shown, in this embodiment, the bucket unloading valve group 21 includes a bucket pilot relief valve 211, a bucket two-position four-way solenoid valve 212, and a bucket check valve 213; the arm unloading valve group 22 includes an arm pilot relief valve 221, an arm two-position four-way solenoid valve 222, and an arm check valve 223; the boom unloading valve group 23 includes an arm pilot relief valve 231, an arm electric-controlled two-position four-way solenoid valve 232, and an arm check valve 233; Specifically, 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 solenoid valve is connected to each pilot relief valve to adjust the relief pressure of each pilot relief valve. Each one-way valve is arranged at the variable pump oil outlet to prevent the hydraulic oil from flowing back.

[0020] Reference Manual Attached Figure 1 As shown, in this embodiment, the diversion and converging valve assembly 3 includes a bucket electrically controlled three-position three-way proportional reversing valve 31, an arm electrically controlled three-position three-way proportional reversing valve 32, a first check valve 33 and a second check valve 34. The oil inlet of the bucket electrically controlled three-position three-way proportional reversing valve 31 is connected to the oil outlet of the bucket variable pump 12, the first oil outlet of the bucket electrically controlled three-position three-way proportional reversing valve 31 is connected to the oil inlet of the bucket distributed valve group 41, and the second oil outlet of the bucket electrically controlled three-position three-way proportional reversing valve 31 is connected to the oil inlet of the bucket distributed valve group 41. The oil port is connected in parallel to the oil inlet of the boom distributed valve group 42 after passing through the first one-way valve 33, the oil inlet of the boom electric-controlled three-position three-way proportional reversing valve 32 is connected to the oil outlet of the boom variable pump 16, the first oil outlet of the boom electric-controlled three-position three-way proportional reversing valve 32 is connected to the oil inlet of the boom distributed valve group 43, and the second oil outlet of the boom electric-controlled three-position three-way proportional reversing valve 32 is connected in parallel to the oil inlet of the boom distributed valve group 42 after passing through the second one-way valve 34; Wherein, under normal working conditions, the oil inlet of the bucket electrically controlled three-position three-way proportional reversing valve 31 is connected to the first oil outlet, the oil outlet of the boom electrically controlled three-position three-way proportional reversing valve 32 is connected to the first oil outlet, and the three actuators are independently driven by the three motor pumps; Under the condition of the boom running fast, the oil inlet of the bucket electric-controlled three-position three-way proportional reversing valve 31 can be controlled to be connected with the second oil outlet, and the oil inlet of the boom electric-controlled three-position three-way proportional reversing valve 32 can be controlled to be gradually connected with the second oil outlet, so as to select the bucket variable pump 12 or the boom variable pump 16 to provide working oil to the boom drive circuit through the diversion and confluence valve assembly 3 according to the working conditions. Figure 1As shown, in this embodiment, the bucket distributed valve group 41 includes a first bucket electrically controlled two-position two-way valve 411, a second bucket electrically controlled two-position two-way valve 412, a third bucket electrically controlled two-position two-way valve 413, and a fourth bucket electrically controlled two-position two-way valve 414. The oil inlet of the first bucket electrically controlled two-position two-way valve 411 is connected to the rodless chamber of the bucket cylinder 51, the oil outlet of the first bucket electrically controlled two-position two-way valve 411 is connected to the hydraulic oil tank 6, and the oil inlet of the second bucket electrically controlled two-position two-way valve 412 is connected to the oil outlet of the bucket variable pump 12. The output end is connected, the oil outlet of the second electrically controlled two-position two-way valve 412 of the bucket is connected to the rodless chamber of the bucket cylinder 51, the oil inlet of the third electrically controlled two-position two-way valve 413 of the bucket is connected to the output end of the bucket variable pump 12, the oil outlet of the third electrically controlled two-position two-way valve 413 of the bucket is connected to the rod chamber of the bucket cylinder 51, the oil inlet of the fourth electrically controlled two-position two-way valve 414 of the bucket is connected to the rod chamber of the bucket cylinder 51, and the oil outlet of the fourth electrically controlled two-position two-way valve 414 of the bucket is connected to the hydraulic oil tank 6.

[0021] Specifically, when the first electrically controlled two-position two-way valve 411 of the bucket and the third electrically controlled two-position two-way valve 413 of the bucket are energized, the hydraulic oil enters the rod chamber of the bucket cylinder 51 through the third electrically controlled two-position two-way valve 413 of the bucket, and the hydraulic oil in the rodless chamber of the bucket cylinder 51 flows back to the hydraulic oil tank 6 through the first electrically controlled two-position two-way valve 411 of the bucket, so that the bucket cylinder piston rod is retracted. When the second electrically controlled two-position two-way valve 412 of the bucket and the fourth electrically controlled two-position two-way valve 414 of the bucket are energized, the hydraulic oil enters the rodless chamber of the bucket cylinder 51 through the second electrically controlled two-position two-way valve 412 of the bucket, and the hydraulic oil in the rod chamber of the bucket cylinder 51 flows back to the hydraulic oil tank 6 through the fourth electrically controlled two-position two-way valve 414 of the bucket, so that the bucket cylinder piston rod is extended.

[0022] Reference Manual Attached Figure 1As shown, in the present embodiment, the boom distributed valve assembly 42 comprises a first electrically controlled two-position two-way valve 421 of the boom, a second electrically controlled two-position two-way valve 422 of the boom, a third electrically controlled two-position two-way valve 423 of the boom, a fourth electrically controlled two-position two-way valve 424 of the boom, a fifth electrically controlled two-position two-way valve 425 of the boom, and a sixth electrically controlled two-position two-way valve 426 of the boom, the oil inlet of the first electrically controlled two-position two-way valve 421 of the boom being connected to the rodless chamber of the boom cylinder 52, the oil outlet of the first electrically controlled two-position two-way valve 421 of the boom being connected to the hydraulic oil tank 6, the oil inlet of the second electrically controlled two-position two-way valve 422 of the boom being connected to the output end of the boom variable pump 14, the oil outlet of the second electrically controlled two-position two-way valve 422 of the boom being connected to the rodless chamber of the boom cylinder 52, the oil inlet of the third electrically controlled two-position two-way valve 423 of the boom being connected to the The output end of the arm variable pump 14 is connected, the oil outlet of the third electrically controlled two-position two-way valve 423 of the arm is connected to the rod chamber of the arm cylinder 52, the oil inlet of the fourth electrically controlled two-position two-way valve 424 of the arm is connected to the rod chamber of the arm cylinder 52, the oil outlet of the fourth electrically controlled two-position two-way valve 424 of the arm is connected to the hydraulic oil tank 6, the oil inlet of the fifth electrically controlled two-position two-way valve 425 of the arm is connected to the oil outlet of the third electrically controlled two-position two-way valve 423 of the arm, the oil outlet of the fifth electrically controlled two-position two-way valve 425 of the arm is connected to the oil outlet of the second electrically controlled two-position two-way valve 422 of the arm, the oil inlet of the sixth electrically controlled two-position two-way valve 426 of the arm is connected to the rod chamber of the arm cylinder 52, and the oil outlet of the sixth electrically controlled two-position two-way valve 426 of the arm can be configured to be connected to an external hydraulic energy recovery system.

[0023] Specifically, when the first electrically controlled two-position two-way valve 421 of the boom and the third electrically controlled two-position two-way valve 423 of the boom are energized, the hydraulic oil enters the rod chamber of the boom cylinder 52 through the third electrically controlled two-position two-way valve 423 of the boom, and the hydraulic oil in the rodless chamber of the boom cylinder 52 flows back to the hydraulic oil tank 6 through the first electrically controlled two-position two-way valve 421 of the boom, so that the boom cylinder piston rod is retracted; when the second electrically controlled two-position two-way valve 422 of the boom and the fourth electrically controlled two-position two-way valve 424 of the boom are energized, the hydraulic oil enters the rodless chamber of the boom cylinder 52 through the second electrically controlled two-position two-way valve 422 of the boom, and the hydraulic oil in the rod chamber of the boom cylinder 52 flows back to the hydraulic oil tank 6 through the fourth electrically controlled two-position two-way valve 424 of the boom, so that the boom cylinder piston rod is extended; Specifically, the fifth electrically controlled two-position two-way valve 425 of the boom is configured to regenerate the energy of the rod chamber of the boom cylinder 52 to the rodless chamber of the boom cylinder 52; Specifically, the sixth electrically controlled two-position two-way valve 426 of the bucket rod is used to recover the return oil hydraulic energy of the rod chamber when the bucket cylinder is overextended; Reference Manual Attached Figure 1As shown, in this embodiment, the boom distributed valve assembly 43 includes a first boom electrically controlled two-position two-way valve 431, a second boom electrically controlled two-position two-way valve 432, a third boom electrically controlled two-position two-way valve 433, a fourth boom electrically controlled two-position two-way valve 434, a fifth boom electrically controlled two-position two-way valve 435, and a sixth boom electrically controlled two-position two-way valve 436. The oil inlet of the first boom electrically controlled two-position two-way valve 431 is connected to the rod chamber of the boom cylinder 53, the oil outlet of the first boom electrically controlled two-position two-way valve 431 is connected to the hydraulic oil tank 6, the oil inlet of the second boom electrically controlled two-position two-way valve 432 is connected to the output end of the boom variable pump 16, the oil outlet of the second boom electrically controlled two-position two-way valve 432 is connected to the rod chamber of the boom cylinder 53, and the oil inlet of the third boom electrically controlled two-position two-way valve 433 is connected to the The output end of the boom variable pump 16 is connected, the oil outlet of the third electrically controlled two-position two-way valve 433 of the boom is connected to the rodless chamber of the boom cylinder 53, the oil inlet of the fourth electrically controlled two-position two-way valve 434 of the boom is connected to the rodless chamber of the boom cylinder 53, the oil outlet of the fourth electrically controlled two-position two-way valve 434 of the boom is connected to the hydraulic oil tank 6, the oil inlet of the fifth electrically controlled two-position two-way valve 435 of the boom is connected to the oil outlet of the third electrically controlled two-position two-way valve 433 of the boom, the oil outlet of the fifth electrically controlled two-position two-way valve 435 of the boom is connected to the oil outlet of the second electrically controlled two-position two-way valve 432 of the boom, the oil inlet of the sixth electrically controlled two-position two-way valve 436 of the boom is connected to the rodless chamber of the boom cylinder 53, and the oil outlet of the sixth electrically controlled two-position two-way valve 436 of the boom can be configured to be connected to an external hydraulic energy recovery system; Specifically, when the first electrically controlled two-position two-way valve 431 of the boom and the third electrically controlled two-position two-way valve 433 of the boom are energized, the hydraulic oil enters the rodless chamber of the boom cylinder 53 through the third electrically controlled two-position two-way valve 433 of the boom, and the hydraulic oil in the rod chamber of the boom cylinder 53 flows back to the hydraulic oil tank through the first electrically controlled two-position two-way valve 431 of the boom, so that the boom cylinder piston rod is extended. When the second electrically controlled two-position two-way valve 432 of the boom and the fourth electrically controlled two-position two-way valve 434 of the boom are energized, the hydraulic oil enters the rod chamber of the boom cylinder 53 through the second electrically controlled two-position two-way valve 432 of the boom, and the hydraulic oil in the rodless chamber of the boom cylinder 53 flows back to the hydraulic oil tank through the fourth electrically controlled two-position two-way valve 434 of the boom, so that the boom cylinder piston rod is retracted. Specifically, the boom fifth electrically controlled two-position two-way valve 435 is configured to regenerate the energy of the rodless chamber of the boom cylinder 53 to the rod chamber of the boom cylinder 53; Specifically, the sixth electrically controlled two-position two-way valve 436 of the boom is used to recover the return oil hydraulic energy of the rodless chamber when the boom cylinder is over-retracted; In addition, this embodiment also provides an electric excavator, including the aforementioned distributed pump-valve composite electro-hydraulic independent drive system.

[0024] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A distributed pump-valve composite electro-hydraulic independent drive system, characterized in that: include: Drive motor-pump assembly, unloading valve assembly, flow dividing and converging valve assembly, distributed valve assembly, actuator assembly, hydraulic oil tank; Wherein, the driving motor-pump assembly includes a bucket motor pump, a stick motor pump and a boom motor pump, the unloading valve assembly includes a bucket unloading valve group, a stick unloading valve group and a boom unloading valve group, the flow dividing and converging valve assembly includes a bucket electrically controlled three-position three-way proportional reversing valve, a boom electrically controlled three-position three-way proportional reversing valve and a first non-return valve and a second non-return valve, the distributed valve assembly includes a bucket distributed valve group, a stick distributed valve group and a boom distributed valve group, and the actuator assembly includes a bucket oil cylinder, a stick oil cylinder and a boom oil cylinder; The drive motor-pump assembly is connected to the diverter and merger valve assembly to provide the system with three independent high-pressure working oils. The diverter and merger valve assembly is connected to the distributed valve group to deliver the three high-pressure oils that have been diverted and merged to the distributed valve group. The distributed valve group is connected to the actuator assembly and controls the flow of working oil entering each actuator to control the speed of each actuator. The unloading valve assembly is arranged at the outlet of the drive motor-pump assembly to adjust the maximum working pressure and unloading function of each drive motor-pump assembly.

2. A distributed pump-valve composite electro-hydraulic independent drive system according to claim 1, characterized in that: The bucket motor pump includes a bucket drive motor and a bucket variable pump, the bucket drive motor is mechanically connected to the bucket variable pump, the oil inlet of the bucket variable pump is connected to the hydraulic oil tank, and the oil outlet of the bucket variable pump is connected to the inlet of the bucket distributed valve assembly; the boom motor pump includes a boom drive motor and a boom variable pump, the boom drive motor is mechanically connected to the boom variable pump, the oil inlet of the boom variable pump is connected to the hydraulic oil tank, and the oil outlet of the boom variable pump is connected to the inlet of the boom distributed valve assembly; the boom motor pump includes a boom drive motor and a boom variable pump, the boom drive motor is mechanically connected to the boom variable pump, the oil inlet of the boom variable pump is connected to the hydraulic oil tank, and the oil outlet of the boom variable pump is connected to the inlet of the boom distributed valve assembly.

3. A distributed pump-valve composite electro-hydraulic independent drive system according to claim 1, characterized in that: The bucket unloading valve group includes a bucket pilot relief valve, a bucket two-position four-way solenoid valve and a bucket check valve, the arm unloading valve group includes an arm pilot relief valve, an arm two-position four-way solenoid valve and an arm check valve, and the boom unloading valve group includes an arm pilot relief valve, an arm electric-controlled two-position four-way solenoid valve and an arm check valve; Among them, the oil inlet of each pilot relief valve is connected to the outlet of each corresponding variable pump, the oil outlet of each pilot relief valve is connected to the hydraulic oil tank, each two-position four-way solenoid valve is connected to each pilot relief valve to adjust the relief pressure of each pilot relief valve, and each check valve is arranged at the corresponding variable pump oil outlet to prevent the system working hydraulic oil from flowing back.

4. A distributed pump-valve composite electro-hydraulic independent drive system according to claim 2, characterized in that: The oil inlet of the bucket electrically controlled three-position three-way proportional reversing valve is connected to the oil outlet of the bucket variable pump, the first oil outlet of the bucket electrically controlled three-position three-way proportional reversing valve is connected to the oil inlet of the bucket distributed valve group, the second oil outlet of the bucket electrically controlled three-position three-way proportional reversing valve is connected in parallel to the oil inlet of the boom distributed valve group after passing through the first one-way valve, the oil inlet of the boom electrically controlled three-position three-way proportional reversing valve is connected to the oil outlet of the boom variable pump, the first oil outlet of the boom electrically controlled three-position three-way proportional reversing valve is connected to the oil inlet of the boom distributed valve group, and the second oil outlet of the boom electrically controlled three-position three-way proportional reversing valve is connected in parallel to the oil inlet of the boom distributed valve group after passing through the second one-way valve; Under normal working conditions, the oil inlet of the bucket electrically controlled three-position three-way proportional reversing valve is connected to the first oil outlet, the oil outlet of the boom electrically controlled three-position three-way proportional reversing valve is connected to the first oil outlet, and the bucket cylinder, the arm cylinder and the boom cylinder are independently driven by the corresponding three motor pumps; Under the condition of rapid operation of the boom, the oil inlet of the bucket's electronically controlled three-position three-way proportional directional valve is controlled to be connected to the second oil outlet, and the oil inlet of the boom's electronically controlled three-position three-way proportional directional valve is controlled to be connected to the second oil outlet, so as to select the bucket variable pump or the boom variable pump to provide working oil to the boom drive circuit through the diverter and merger valve assembly according to the working conditions.

5. A distributed pump-valve composite electro-hydraulic independent drive system according to claim 2, characterized in that: The bucket distributed valve group includes a first electrically controlled two-position two-way valve for the bucket, a second electrically controlled two-position two-way valve for the bucket, a third electrically controlled two-position two-way valve for the bucket, and a fourth electrically controlled two-position two-way valve for the bucket. The oil inlet of the first electrically controlled two-position two-way valve for the bucket is connected to the rodless chamber of the bucket cylinder, the oil outlet of the first electrically controlled two-position two-way valve for the bucket is connected to the hydraulic oil tank, and the oil inlet of the second electrically controlled two-position two-way valve for the bucket is connected to the oil outlet 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 oil outlet 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; When the first electrically controlled two-position two-way valve of the bucket and the third electrically controlled two-position two-way valve of the bucket are energized, the hydraulic oil enters the rod chamber of the bucket cylinder through the third electrically controlled two-position two-way valve of the bucket, and the hydraulic oil in the rodless chamber of the bucket cylinder flows back to the hydraulic oil tank through the first electrically controlled two-position two-way valve of the bucket, so that the piston rod of the bucket cylinder is retracted. When the second electrically controlled two-position two-way valve of the bucket and the fourth electrically controlled two-position two-way valve of the bucket are energized, the hydraulic oil enters the rodless chamber of the bucket cylinder through the second electrically controlled two-position two-way valve of the bucket, and the hydraulic oil in the rod chamber of the bucket cylinder flows back to the hydraulic oil tank through the fourth electrically controlled two-position two-way valve of the bucket, so that the piston rod of the bucket cylinder is extended.

6. A distributed pump-valve composite electro-hydraulic independent drive system according to claim 1, characterized in that: The boom distributed valve group includes a first electrically controlled two-position two-way valve of the boom, a second electrically controlled two-position two-way valve of the boom, a third electrically controlled two-position two-way valve of the boom, a fourth electrically controlled two-position two-way valve of the boom, a fifth electrically controlled two-position two-way valve of the boom, and a sixth electrically controlled two-position two-way 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, the oil outlet of the first electrically controlled two-position two-way valve of the boom is connected to the hydraulic oil tank, the oil inlet of the second electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the boom variable pump, the oil outlet of the second electrically controlled two-position two-way valve of the boom is connected to the rodless chamber of the boom cylinder, and the oil inlet of the third electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the boom 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 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 cylinder, 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 bucket arm is connected to the oil outlet of the third electrically controlled two-position two-way valve of the bucket arm, the oil outlet of the fifth electrically controlled two-position two-way valve of the bucket arm is connected to the oil outlet of the second electrically controlled two-position two-way valve of the bucket arm, the oil inlet of the sixth electrically controlled two-position two-way valve of the bucket arm is connected to the rod chamber of the bucket arm cylinder, and the oil outlet of the sixth electrically controlled two-position two-way valve of the bucket arm can be configured to be connected to an external hydraulic energy recovery system; When 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 energized, the 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 hydraulic 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, so that the piston rod of the boom cylinder is retracted. When 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 energized, the 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 hydraulic 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, so that the piston rod of the boom cylinder is extended. 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; The sixth electrically controlled two-position two-way valve of the bucket rod is used to recover the return oil hydraulic energy of the rod chamber when the bucket cylinder is overextended.

7. A distributed pump-valve composite electro-hydraulic independent drive system according to claim 1, characterized in that: The boom distributed valve group includes a first electrically controlled two-position two-way valve of the boom, a second electrically controlled two-position two-way valve of the boom, a third electrically controlled two-position two-way valve of the boom, a fourth electrically controlled two-position two-way valve of the boom, a fifth electrically controlled two-position two-way valve of the boom, and a sixth electrically controlled two-position two-way valve of the boom. The oil inlet of the first 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 first electrically controlled two-position two-way valve of the boom is connected to the hydraulic oil tank, the oil inlet of the second electrically controlled two-position two-way valve of the boom is connected to the oil outlet of the boom variable pump, the oil outlet of the second electrically controlled two-position two-way valve of the boom is connected to the rod chamber of the boom cylinder, and the oil inlet of the third electrically controlled two-position two-way valve of the boom is connected to the oil outlet 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 can be configured to be connected to an external hydraulic energy recovery system; When 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 energized, the 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 hydraulic 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, so that the boom cylinder piston rod is extended. When 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 energized, the 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 hydraulic 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, so that the boom cylinder piston rod is retracted. 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; Among them, the sixth electrically controlled two-position two-way valve of the boom is used for hydraulic energy recovery of the return oil hydraulic energy of the rodless chamber when the boom cylinder exceeds and retracts.

8. An electric excavator device, characterized in that: It comprises a distributed pump-valve composite electro-hydraulic independent drive system as described in any one of claims 1-7.

Images