CN112663704A - Hydraulic system of excavator - Google Patents
Hydraulic system of excavator Download PDFInfo
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- CN112663704A CN112663704A CN202011599519.8A CN202011599519A CN112663704A CN 112663704 A CN112663704 A CN 112663704A CN 202011599519 A CN202011599519 A CN 202011599519A CN 112663704 A CN112663704 A CN 112663704A
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Abstract
The invention provides a hydraulic system of an excavator aiming at the conditions that the existing excavator has higher requirements on the operability of a driver and lower working efficiency under different working conditions, so as to reduce the operation difficulty of the driver and improve the production efficiency, a large arm control main valve, a bucket rod control main valve and a rotary control main valve are all arranged on a working oil path of a plunger variable pump in parallel, a pilot oil pump is connected with pilot liquid control ends at two ends of each control main valve through a control handle, a proportional electromagnetic valve is arranged on an oil path between the pilot liquid control ends at two ends of each control main valve and the control handle, an oil inlet path and an oil outlet path of the proportional electromagnetic valve are respectively communicated with the pilot liquid control ends of each control main valve and a working oil port of the control handle, pilot electric control ends of the proportional electromagnetic valves are all connected with a controller, one end of the controller is connected with the pilot electric control end, the other end of the controller is connected to a human-computer interface, and the human-computer interface is used for operating and setting parameters of the controller.
Description
Technical Field
The invention discloses a hydraulic system of an excavator, and belongs to the technical field of excavators.
Background
The excavator is a construction machine for excavating soil, and the overall structure comprises a working device, a walking structure, a slewing mechanism, a control mechanism and the like. The working device can be subdivided into structures such as a movable arm, a bucket rod and a bucket. In general construction, a hydraulic pilot handle is directly operated to control a boom, an arm, and a bucket to perform various operating conditions.
The working conditions of the excavator generally comprise a flat ground working condition, an earthwork loading working condition and a slope brushing and slotting working condition. Under each working condition, the speed of the movable arm, the bucket rod and the bucket in mutual matching is different, so that a driver needs to have enough experience to deal with different working conditions, and the driver needs to constantly repeat a certain action to meet the requirement of engineering quality through fine adjustment. This has a great restriction on both the work efficiency and the driving comfort.
Disclosure of Invention
The invention provides the excavator hydraulic system aiming at the conditions that the existing excavator has higher requirement on the operability of a driver and lower working efficiency under different working conditions, so that the operation difficulty of the driver is reduced and the production efficiency is improved.
In order to solve the technical problems, the invention adopts the technical scheme that: the excavator hydraulic system comprises a big arm oil cylinder, a bucket rod oil cylinder, a rotary motor, a big arm control main valve, a bucket rod oil cylinder, a rotary control main valve, an operating handle and a pump oil system, wherein the big arm control main valve is connected with the big arm oil cylinder and used for controlling the big arm oil cylinder, the bucket control main valve is connected with the bucket oil cylinder and used for controlling the bucket oil cylinder, the bucket rod oil cylinder is connected with the bucket rod oil cylinder and used for controlling the bucket rod oil cylinder, the rotary control main valve is connected with the rotary motor and used for controlling the rotary motor, the operating handle is connected with pilot hydraulic ends at two ends of each control main valve, The oil outlet is correspondingly communicated with working oil paths of a large arm control main valve, a bucket rod control main valve and a rotary control main valve, a pilot oil pump is connected with pilot hydraulic control ends at two ends of each control main valve through a control handle, proportional electromagnetic valves are arranged on the oil paths between the pilot hydraulic control ends at the two ends of each control main valve and the control handle, oil inlet and outlet paths of the proportional electromagnetic valves are respectively communicated with the pilot hydraulic control ends of the control main valves and the working oil ports of the control handle, pilot electric control ends of the proportional electromagnetic valves are connected with controllers, one ends of the controllers are connected to the pilot electric control ends of the proportional electromagnetic valves, the other ends of the controllers are connected to a human-computer interface, and the human-computer interface is used for operating and parameter setting of the controllers.
The man-machine interface comprises a flat ground mode, an earthwork mode, a slope brushing mode and a user-defined mode, and is used for carrying out differentiated signal control on a pilot electric control end of the proportional solenoid valve through a controller so as to adjust the opening degrees of the eight proportional solenoid valves.
Compared with the prior art, the invention has the beneficial effects that: the invention can reasonably adjust the matching speed of the boom, the bucket rod, the bucket and the rotation according to different working conditions, and can adapt to the use habits of different drivers by flexibly adjusting parameters, thereby improving the efficiency and the comfort of operation.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the principle of the present invention.
FIG. 2 is a block diagram of a human-machine interface process according to the present invention.
In the figure: the control system comprises a human-machine interface 1, a controller 2, a big arm oil cylinder 3, a bucket oil cylinder 4, a bucket rod oil cylinder 5, a rotary motor 6, a pilot oil pump 7, a big arm control main valve 8, a bucket control main valve 9, a bucket control main valve 10, a bucket rod control main valve 11, a rotary control main valve 12, a proportional electromagnetic valve 13, a control handle 13, a hydraulic oil tank 14 and a plunger variable pump 15.
Detailed Description
As shown in fig. 1 and 2, the excavator hydraulic system of the present invention includes a boom cylinder 3, a bucket cylinder 4, a stick cylinder 5, a swing motor 6, a boom control main valve 8 connected to the boom cylinder 3 for controlling the boom cylinder 3, a bucket control main valve 9 connected to the bucket cylinder 4 for controlling the bucket cylinder 4, a stick control main valve 10 connected to the stick cylinder 5 for controlling the stick cylinder 5, a swing control main valve 11 connected to the swing motor 6 for controlling the swing motor 6, a manipulating handle 13 connected to pilot control ends of the control main valves, and a pump oil system connected to the control main valves, wherein the pump oil system includes a plunger variable displacement pump 15, a pilot oil pump 7, and a hydraulic oil tank 14, the boom control main valve 8, the bucket control main valve 9, the stick control main valve 10, and the swing control main valve 11 are all provided in parallel to a working oil path of the plunger variable displacement pump 15, the oil inlet and outlet of the big arm oil cylinder 3, the bucket oil cylinder 4, the bucket rod oil cylinder 5 and the rotary motor 6 are correspondingly communicated with the working oil paths of a big arm control main valve 8, a bucket control main valve 9, a bucket rod control main valve 10 and a rotary control main valve 11, the pilot oil pump 7 is connected with the pilot hydraulic control ends at two ends of each control main valve through a control handle 13, the oil paths between the pilot hydraulic control ends at two ends of each control main valve and the control handle 13 are respectively provided with a proportional electromagnetic valve 12, the oil inlet and outlet paths of the proportional electromagnetic valve 12 are respectively communicated with the pilot hydraulic control ends of each control main valve and the working oil ports of the control handle 13, the pilot electric control ends of the proportional electromagnetic valves 12 are respectively connected with a controller 2, one end of the controller 2 is connected with the pilot electric control end of the proportional electromagnetic valve 12, the other end of the controller 2 is connected with a human-, the human-computer interface 1 is used for operating the controller and setting parameters.
The man-machine interface 1 comprises a flat ground mode, an earthwork mode, a slope brushing mode and a user-defined mode, and the man-machine interface 1 controls differentiated signals through a controller 2 to the pilot electric control end of the proportional electromagnetic valve 12 so as to adjust the opening of the eight proportional electromagnetic valves 12.
The controller 2 in the present invention is an existing control structure including, but not limited to, a PLC module.
The excavator hydraulic system related to the invention includes: the hydraulic control system comprises a large arm oil cylinder, a bucket rod oil cylinder, a rotary motor, a large arm control main valve, a bucket rod main valve, a rotary motor, a rotary control main valve, a pilot handle, an oil pumping system, a proportional electromagnetic valve, a controller and a human-computer interface, wherein the large arm control main valve is connected with the large arm oil cylinder and used for controlling the large arm oil cylinder, the bucket control main valve is connected with the bucket oil cylinder and used for controlling the bucket oil cylinder, the bucket rod control main valve is connected with the bucket rod oil cylinder and used for controlling the bucket rod oil cylinder, the rotary control main valve is connected with the rotary motor and used for controlling the rotary motor, the pilot handle is connected.
The human-computer interface can set parameters of the controller according to the three different working conditions, and the controller can control the eight proportional solenoid valves according to different signals. Through differentiated control signals, the opening degree of the proportional solenoid valves can be reasonably matched, so that the actuating mechanisms such as a large arm, a bucket rod, a bucket and a rotary actuator can be reasonably matched at the action speeds under different working conditions, the fine adjustment of a handle is not needed to be considered when a driver operates, the full-stroke action can be relieved, and the production efficiency and the comfort of operation are improved.
The excavator hydraulic system in the present embodiment is used for an excavator, and the oil pump system includes a plunger variable displacement pump 15, a pilot oil pump 7, and a hydraulic oil tank 14.
The plunger variable displacement pump 15 sucks hydraulic oil from a hydraulic oil tank 14 and outputs the hydraulic oil from a pump port, and supplies the hydraulic oil to the boom cylinder 3, the bucket cylinder 4, the arm cylinder 5, and the swing motor 6 through a boom control main valve 8, a bucket control main valve 9, an arm control main valve 10, and a swing control main valve 11, respectively, to provide power required by the respective actuators of the excavator.
The pilot oil pump 7 sucks hydraulic oil from a hydraulic oil tank 14 and outputs the hydraulic oil from a pump port, outputs different pilot control pressures through a control handle 13, controls the opening degrees of valve ports of a boom control main valve 8, a bucket control main valve 9, a boom control main valve 10 and a swing control main valve 11, further controls the flow rates entering each actuator, and realizes speed control of the excavator under different working conditions.
And a proportional electromagnetic valve 12 is arranged between the operating handle 13 and the pilot liquid control ends at the two ends of each control main valve, and can linearly control the oil return back pressure of each executing element, so that the proportional electromagnetic valve flexibly adapts to various different working condition requirements.
When the excavator works on the ground, a bucket rod fast point and a big arm slow point are needed. At this time, the man-machine interface 1 enters a flat ground mode parameter setting page, the corresponding current parameter size of each proportional electromagnetic valve 12 is set, and then a control signal is output to each proportional electromagnetic valve 12 through the controller 2, so that the pilot pressure of the pilot liquid control ends at the two ends of each control main valve is correspondingly changed, the valve port opening of each control main valve is changed, and the speed matching of each execution element required in flat ground is achieved. Similarly, when loading, a large arm is needed to be at a fast point, and a bucket rod is needed to be at a slow point. At this time, the user enters a loading mode parameter setting page through the human-computer interface 1, and corresponding parameters are set, so that the opening degree of each control main valve can be changed, and the speed matching of each execution element during loading is achieved.
In addition, a user-defined mode is further arranged in the human-computer interface 1, and a driver can set current parameters adaptive to own operation habits through user definition, so that the comfort during operation is better increased.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (2)
1. Excavator hydraulic system, including big arm hydro-cylinder (3), scraper bowl hydro-cylinder (4), dipper hydro-cylinder (5), swing motor (6), be connected big arm control main valve (8) that is used for controlling big arm hydro-cylinder (3) with big arm hydro-cylinder (3), be connected scraper bowl control main valve (9) that is used for controlling scraper bowl hydro-cylinder (4) with scraper bowl hydro-cylinder (4), be connected bucket control main valve (10) that is used for controlling dipper hydro-cylinder (5) with dipper hydro-cylinder (5), be connected swing control main valve (11) that is used for controlling swing motor (6) with swing motor (6), control handle (13) of being connected with the pilot fluid accuse end at above-mentioned each control main valve both ends and the pump oil system of being connected with above-mentioned each control main valve, its characterized in that, pump oil system includes plunger variable displacement pump (15), pilot oil pump (7) and hydraulic tank (14), big arm control main valve (8), The bucket control main valve (9), the bucket rod control main valve (10) and the rotary control main valve (11) are all arranged on a working oil path of the plunger variable pump (15) in parallel, the oil inlet and the oil outlet of the big arm oil cylinder (3), the bucket oil cylinder (4), the bucket rod oil cylinder (5) and the rotary motor (6) are correspondingly communicated with working oil paths of the big arm control main valve (8), the bucket control main valve (9), the bucket rod control main valve (10) and the rotary control main valve (11), the pilot oil pump (7) is connected with pilot hydraulic control ends at two ends of each control main valve through an operating handle (13), proportional electromagnetic valves (12) are arranged on oil paths between the pilot hydraulic control ends at two ends of each control main valve and the operating handle (13), the oil inlet and the oil outlet of each proportional electromagnetic valve (12) are respectively communicated with the pilot hydraulic control ends of each control main valve and the working oil ports of the operating handle (13), the pilot electric control end of the proportional solenoid valve (12) is connected with a controller (2), one end of the controller (2) is connected to the pilot electric control end of the proportional solenoid valve (12), the other end of the controller (2) is connected to a human-computer interface (1), and the human-computer interface (1) is used for operating and setting parameters of the controller.
2. The hydraulic system of the excavator according to claim 1, wherein the human-machine interface (1) comprises a land leveling mode, an earth leveling mode, a slope brushing mode and a user-defined mode, and the human-machine interface (1) performs differential signal control on a pilot electric control end of the proportional solenoid valve (12) through the controller (2) to realize adjustment of the opening degrees of the eight proportional solenoid valves (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599519.8A CN112663704A (en) | 2020-12-30 | 2020-12-30 | Hydraulic system of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599519.8A CN112663704A (en) | 2020-12-30 | 2020-12-30 | Hydraulic system of excavator |
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| Publication Number | Publication Date |
|---|---|
| CN112663704A true CN112663704A (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011599519.8A Pending CN112663704A (en) | 2020-12-30 | 2020-12-30 | Hydraulic system of excavator |
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| CN (1) | CN112663704A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113983226A (en) * | 2021-10-26 | 2022-01-28 | 三一重机有限公司 | Excavator walking control method and device and excavator |
-
2020
- 2020-12-30 CN CN202011599519.8A patent/CN112663704A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113983226A (en) * | 2021-10-26 | 2022-01-28 | 三一重机有限公司 | Excavator walking control method and device and excavator |
| CN113983226B (en) * | 2021-10-26 | 2023-08-22 | 三一重机有限公司 | Excavator walking control method and device and excavator |
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