CN112377476A - Sweeper energy-saving hydraulic system with composite function - Google Patents
Sweeper energy-saving hydraulic system with composite function Download PDFInfo
- Publication number
- CN112377476A CN112377476A CN202011494681.3A CN202011494681A CN112377476A CN 112377476 A CN112377476 A CN 112377476A CN 202011494681 A CN202011494681 A CN 202011494681A CN 112377476 A CN112377476 A CN 112377476A
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- 241001417527 Pempheridae Species 0.000 title claims abstract description 20
- 239000002131 composite material Substances 0.000 title abstract description 8
- 239000003921 oil Substances 0.000 claims abstract description 97
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 19
- 238000013016 damping Methods 0.000 claims description 6
- 230000002457 bidirectional effect Effects 0.000 claims 1
- 238000010408 sweeping Methods 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
- E01H1/0827—Dislodging by suction; Mechanical dislodging-cleaning apparatus with independent or dependent exhaust, e.g. dislodging-sweeping machines with independent suction nozzles ; Mechanical loosening devices working under vacuum
- E01H1/0836—Apparatus dislodging all of the dirt by suction ; Suction nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/022—Flow-dividers; Priority valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
- E01H2001/0881—Details for pneumatically dislodging or removing not related to the mouth-piece
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention belongs to the technical field of motor sweeper, and particularly relates to a motor sweeper energy-saving hydraulic system with a composite function, which comprises a hydraulic pump connected with a hydraulic oil tank, wherein the hydraulic pump is connected with a P port of a priority valve, a CF port of the priority valve is connected with a three-position four-way reversing valve, and an EF port of the priority valve is connected with a P port of a three-way proportional valve; one working oil port of the three-position four-way reversing valve is connected with a rodless cavity of the suction nozzle lifting oil cylinder, the other working oil port of the three-position four-way reversing valve is connected with a rod cavity of the suction nozzle lifting oil cylinder, a two-way hydraulic lock is arranged between the two working oil ports of the three-position four-way reversing valve, and the two working oil ports of the three-position four-way reversing valve are both connected with an Ls port of the priority valve through a corresponding one-way valve II; the hydraulic control system further comprises a logic valve, an oil inlet of the logic valve is communicated with an EF port of the priority valve, an oil outlet of the logic valve is communicated with an oil return port of the oil way, and control oil ports of the logic valve are respectively communicated with working oil ports of the three-way proportional valve. Redundant flow returns to the oil tank under smaller pressure during working, and energy loss is reduced.
Description
Technical Field
The invention belongs to the technical field of motor sweeper, and particularly relates to a motor sweeper energy-saving hydraulic system with a composite function.
Background
At present, a hydraulic system of a sweeper in the industry mostly adopts an open type hydraulic system consisting of a fixed displacement pump and an integrated plate type superposed valve. The hydraulic system mainly provides power for each execution oil cylinder and the sweeping disc motor, and the mechanism with smaller cylinder diameter and stroke has too high running speed, can not be stable and can not work due to the difference of cylinder diameter and stroke of the execution mechanism oil cylinder and the working under the same flow. In order to ensure the normal work of the actuating mechanism, a throttle valve or a damping plug is designed in the system, redundant flow is discharged through an overflow valve, the running speed of the oil cylinder is reduced, and the energy loss of the system is large.
The washing and sweeping vehicle in trade adopts a key operation during operation, and in the course of the work, if the sucking disc front edge is piled up rubbish, operation sucking disc promotes inefficiently, can't be with rubbish suction processing. In order to solve the problem, the cylinder and the electric knob are separately added, so that the electric knob is complex.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the sweeper energy-saving hydraulic system with the composite function, redundant flow returns to the oil tank under smaller pressure during working, and energy loss is reduced.
The invention is realized by the following technical scheme: a sweeper energy-saving hydraulic system with a composite function comprises a hydraulic pump connected with a hydraulic oil tank, wherein the hydraulic pump is connected with a P port of a priority valve, a CF port of the priority valve is connected with a three-position four-way reversing valve, and an EF port of the priority valve is connected with a P port of a three-way proportional valve; one working oil port of the three-position four-way reversing valve is connected with a rodless cavity of the suction nozzle lifting oil cylinder, the other working oil port of the three-position four-way reversing valve is connected with a rod cavity of the suction nozzle lifting oil cylinder, a two-way hydraulic lock is arranged between the two working oil ports of the three-position four-way reversing valve, and the two working oil ports of the three-position four-way reversing valve are both connected with an Ls port of the priority valve through a corresponding one-way valve II; the hydraulic control system further comprises a logic valve, wherein an oil inlet of the logic valve is communicated with an EF port of the priority valve, an oil outlet of the logic valve is communicated with an oil return port of the oil way, a control oil port of the logic valve is respectively communicated with a working oil port of the three-way proportional valve, and the working oil port of the three-way proportional valve is connected with an execution element; an unloading valve is arranged between the oil outlet of the hydraulic pump and the hydraulic oil tank.
Furthermore, a one-way valve I is arranged at an oil outlet of the hydraulic pump.
Furthermore, an overflow valve I is arranged between the oil outlet of the hydraulic pump and the oil return port of the oil way; and an overflow valve II is arranged between the Ls port of the priority valve and the oil return port of the oil way.
Furthermore, a damping plug is arranged between the one-way valve II and the Ls port of the priority valve.
The invention has the beneficial effects that: the valve group is provided with the proportional valve in a first-connection mode, hydraulic oil flow output by the three-way proportional valve is set according to the running speed of each oil cylinder, redundant flow returns to the oil tank under small pressure during working, and energy loss is low. The sweeper energy-saving hydraulic system with the composite function can realize that the suction nozzle is lifted in the working process of the sweeping disc, the accumulated garbage at the front edge is sucked, and the sweeping efficiency is improved.
Drawings
FIG. 1 is a hydraulic schematic of the present invention;
FIG. 2 is a schematic view of the arrangement of some of the components of the present invention on a sweeper truck;
in the figure, the device comprises a three-way proportional valve 1, a logic valve 2, a priority valve 3, a priority valve 4, overflow valves II, 5, damping plugs 6, check valves II, 7, suction nozzle lifting cylinders 8, a two-way hydraulic lock 9, a three-position four-way reversing valve 10, overflow valves I, 11, check valves I, 12, hydraulic pumps 13, a hydraulic oil tank 14, unloading valves 15, an actuating element 16 and an electric switch.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
As shown in figure 1, the energy-saving hydraulic system with the compound function for the sweeper comprises a hydraulic pump 12 connected with a hydraulic oil tank 13, wherein the hydraulic oil tank 13 mainly has the functions of storing oil and dissipating heat for the hydraulic system of the sweeper, and the hydraulic pump 12 is arranged at the output port of a PTO (power take-off) of a secondary engine to provide power for the system. An oil outlet of the hydraulic pump 12 is connected with a P port of the priority valve 3, a CF port of the priority valve 3 is connected with the three-position four-way reversing valve 9, and an EF port of the priority valve 3 is connected with a P port of the three-way proportional valve 1; one working oil port of the three-position four-way reversing valve 9 is connected with a rodless cavity of the suction nozzle lifting oil cylinder 7, the other working oil port of the three-position four-way reversing valve 9 is connected with a rod cavity of the suction nozzle lifting oil cylinder 7, a two-way hydraulic lock 8 is arranged between the two working oil ports of the three-position four-way reversing valve 9, and the two-way hydraulic lock 8 is used for controlling the suction nozzle to hover at any position. Two working oil ports of the three-position four-way reversing valve 9 are connected with the Ls port of the priority valve 3 through corresponding one-way valves II 6; when oil is fed into the port P of the priority valve 3, hydraulic oil is preferentially supplied to the CF port of the priority valve 3 through the valve core, when a suction nozzle is not operated, the CF port is in a closed state, the pressure of the port Ls is zero at the moment, oil is fed into the right end of the valve core, hydraulic pressure acts on the right end of the valve core, the valve core is made to move leftwards by overcoming the pre-pressure of a spring, and the port P of the priority valve 3 is communicated with the port EF of the priority valve 3 at the moment. When the suction nozzle works, the CF opening of the priority valve 3 is connected with the suction nozzle lifting oil cylinder 7 through the three-position four-way reversing valve 9, the oil coming from the hydraulic pump enters the suction nozzle lifting oil cylinder 7, the oil cylinder retracts, the front end of the suction nozzle is opened, and garbage is accumulated at the front edge of suction. The hydraulic system is characterized by further comprising a logic valve 2, an oil inlet of the logic valve 2 is communicated with an EF (electric-fluid) port of the priority valve 3, an oil outlet of the logic valve 2 is communicated with an oil way oil return port, a control oil port of the logic valve 2 is respectively communicated with a working oil port of the three-way proportional valve 1, the logic valve 2 is opened under certain pressure, when the pressure difference between the inlet and the outlet of the three-way proportional valve 1 is larger than the opening pressure value of the logic valve 2, the logic valve 2 is opened, redundant oil returns to the hydraulic oil tank 13 from the logic valve 2, and the opening pressure of the logic valve 2 is far lower than the opening. The working oil port of the three-way proportional valve 1 is connected with an actuating element 15 (the actuating element 15 comprises an actuating element which is required by the sweeper and is controlled by hydraulic pressure); the three-way proportional valve 1 inputs different current values through an electrical system, the port A of the three-way proportional valve 1 outputs hydraulic oil with different flow rates, so that corresponding hydraulic oil can be output according to the requirement of the operating speed of an execution mechanism, and redundant flow rate returns to the hydraulic oil tank 13 through the logic valve 2. An unloading valve 14 is arranged between the oil outlet of the hydraulic pump 12 and the hydraulic oil tank 13. When all the valve cores are positioned at the middle position, unloading and power loss are controlled through electricity, oil output by the hydraulic pump directly returns to the hydraulic oil tank 13 through the unloading valve 14, and the system automatically unloads; when one valve core acts, the unloading is controlled by electricity to maintain the pressure of the system.
As shown in figure 2, the electric switch 16 is connected with a circuit in parallel with a key operation, and the electric switch 16 can be operated to lift the suction nozzle independently during the operation.
The working principle of the hydraulic system is as follows:
firstly, calibrating the hydraulic oil flow which needs to be output corresponding to the running speed of each actuating mechanism of the three-way proportional valve 1, determining the position of a valve core of the logic valve 2 by the pressure difference delta P between the port P of the three-way proportional valve 1 and the port A of the three-way proportional valve 1, when the pressure difference between two ends of the three-way proportional valve 1 is greater than delta P, moving the valve core of the logic valve 2 to the left, returning the redundant flow to the hydraulic oil tank 13 through the logic valve 2, and enabling the pump to always work under the pressure of an actuating element plus the pressure difference delta P, so that the pressure loss is small.
When the sweeper works, the suction nozzle descends, the sweeping disc descends and the sweeping disc rotates in sequence through one-key operation, when the front edge of the suction nozzle is full of garbage in the working process, the electric switch 16 is operated, the valve core of the three-position four-way reversing valve 9 moves to the right position, the CF port of the priority valve 3 is communicated with the suction nozzle lifting oil cylinder 7 through the three-position four-way reversing valve 9, the suction nozzle lifting oil cylinder 7 retracts, the front end of the suction nozzle is opened to suck the garbage at the front edge, then the reverse operation is carried out again, the suction nozzle is restored to the original position.
As an improvement of the embodiment, a check valve I11 is arranged at an oil outlet of the hydraulic pump 12, so that the hydraulic impact is prevented from influencing the work of the hydraulic pump.
As an improvement of this embodiment, an overflow valve i 10 is disposed between an oil outlet of the hydraulic pump 12 and an oil return port of the oil path, and the overflow valve i 10 is a system safety valve to prevent the system from being overloaded and protect pipelines and elements. An overflow valve II 4 is arranged between the Ls port of the priority valve 3 and the oil way oil return port, and the overflow valve II 4 is a priority valve Ls oil way safety valve and prevents Ls oil way pressure from being too high.
As a modification of the present embodiment, a damping plug 5 is provided between the one-way valve ii 6 and the Ls port of the priority valve 3, and the damping plug 5 is used for balancing the control oil line oil pressure.
The valve group is provided with the proportional valve in a first-connection mode, hydraulic oil flow output by the three-way proportional valve is set according to the running speed of each oil cylinder, redundant flow returns to the oil tank under small pressure during working, and energy loss is low. The sweeper energy-saving hydraulic system with the composite function can realize that the suction nozzle is lifted in the working process of the sweeping disc, the accumulated garbage at the front edge is sucked, and the sweeping efficiency is improved.
Claims (4)
1. The utility model provides an energy-conserving hydraulic system of motor sweeper with combined function which characterized in that: the hydraulic control valve comprises a hydraulic pump (12) connected with a hydraulic oil tank (13), wherein the hydraulic pump (12) is connected with a P port of a priority valve (3), a CF port of the priority valve (3) is connected with a three-position four-way reversing valve (9), and an EF port of the priority valve (3) is connected with the P port of a three-way proportional valve (1); a working oil port of the three-position four-way reversing valve (9) is connected with a rodless cavity of the suction nozzle lifting oil cylinder (7), the other working oil port of the three-position four-way reversing valve (9) is connected with a rod cavity of the suction nozzle lifting oil cylinder (7), a bidirectional hydraulic lock (8) is arranged between the two working oil ports of the three-position four-way reversing valve (9), and the two working oil ports of the three-position four-way reversing valve (9) are connected with an Ls port of the priority valve (3) through corresponding one-way valves II (6); the hydraulic control system is characterized by further comprising a logic valve (2), wherein an oil inlet of the logic valve (2) is communicated with an EF port of the priority valve (3), an oil outlet of the logic valve (2) is communicated with an oil return port of an oil way, a control oil port of the logic valve (2) is respectively communicated with a working oil port of the three-way proportional valve (1), and the working oil port of the three-way proportional valve (1) is connected with an execution element (15); an unloading valve (14) is arranged between the oil outlet of the hydraulic pump (12) and the hydraulic oil tank (13).
2. The sweeper energy-saving hydraulic system with combined function as claimed in claim 1, wherein: and a one-way valve I (11) is arranged at an oil outlet of the hydraulic pump (12).
3. The sweeper energy-saving hydraulic system with combined function as claimed in claim 1, wherein: an overflow valve I (10) is arranged between an oil outlet of the hydraulic pump (12) and an oil way oil return port; and an overflow valve II (4) is arranged between the Ls port of the priority valve (3) and the oil way oil return port.
4. The sweeper energy-saving hydraulic system with combined function as claimed in claim 1, wherein: and a damping plug (5) is arranged between the one-way valve II (6) and the Ls port of the priority valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011494681.3A CN112377476B (en) | 2020-12-17 | 2020-12-17 | Energy-saving hydraulic system with composite function for sweeper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011494681.3A CN112377476B (en) | 2020-12-17 | 2020-12-17 | Energy-saving hydraulic system with composite function for sweeper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112377476A true CN112377476A (en) | 2021-02-19 |
| CN112377476B CN112377476B (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011494681.3A Active CN112377476B (en) | 2020-12-17 | 2020-12-17 | Energy-saving hydraulic system with composite function for sweeper |
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| Country | Link |
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| CN (1) | CN112377476B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19526909A1 (en) * | 1995-07-22 | 1997-01-23 | Rexroth Mannesmann Gmbh | Hydraulic drive, e.g. for rubbish compacting vehicle |
| CA2638113A1 (en) * | 2007-07-27 | 2009-01-27 | The Hartfiel Company | Hydraulic actuator control system for refuse vehicles |
| CN205078525U (en) * | 2015-09-29 | 2016-03-09 | 赞恩达传动控制技术（大连）有限公司 | Round brush integrated control valves |
| JP2017187116A (en) * | 2016-04-06 | 2017-10-12 | 株式会社クボタ | Hydraulic system of work machine |
| CN108547810A (en) * | 2018-07-19 | 2018-09-18 | 常州常发农业装备工程技术研究有限公司 | A kind of hydraulic control system of energy-efficient grain combine |
| CN112081170A (en) * | 2020-09-25 | 2020-12-15 | 徐工集团工程机械股份有限公司科技分公司 | Loader hydraulic system and loader |
-
2020
- 2020-12-17 CN CN202011494681.3A patent/CN112377476B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19526909A1 (en) * | 1995-07-22 | 1997-01-23 | Rexroth Mannesmann Gmbh | Hydraulic drive, e.g. for rubbish compacting vehicle |
| CA2638113A1 (en) * | 2007-07-27 | 2009-01-27 | The Hartfiel Company | Hydraulic actuator control system for refuse vehicles |
| CN205078525U (en) * | 2015-09-29 | 2016-03-09 | 赞恩达传动控制技术（大连）有限公司 | Round brush integrated control valves |
| JP2017187116A (en) * | 2016-04-06 | 2017-10-12 | 株式会社クボタ | Hydraulic system of work machine |
| CN108547810A (en) * | 2018-07-19 | 2018-09-18 | 常州常发农业装备工程技术研究有限公司 | A kind of hydraulic control system of energy-efficient grain combine |
| CN112081170A (en) * | 2020-09-25 | 2020-12-15 | 徐工集团工程机械股份有限公司科技分公司 | Loader hydraulic system and loader |
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| Publication number | Publication date |
|---|---|
| CN112377476B (en) | 2024-03-26 |
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