CN117185213A - High-altitude vehicle hydraulic system and control method - Google Patents
High-altitude vehicle hydraulic system and control method Download PDFInfo
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- CN117185213A CN117185213A CN202311157980.1A CN202311157980A CN117185213A CN 117185213 A CN117185213 A CN 117185213A CN 202311157980 A CN202311157980 A CN 202311157980A CN 117185213 A CN117185213 A CN 117185213A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000013016 damping Methods 0.000 claims description 7
- 238000011217 control strategy Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 64
- 230000009471 action Effects 0.000 description 10
- 238000009826 distribution Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Abstract
The invention discloses a hydraulic system and a control method of a high-altitude vehicle, wherein the hydraulic system comprises a hydraulic power system (1) and a control multi-way valve, the hydraulic power system (1) comprises a fixed flow main pump (13), an inlet of the fixed flow main pump (13) is connected with an oil tank (16), and an oil return filter (17) is arranged on the oil tank (16); the control multi-way valve comprises an oil inlet unit (2), the oil inlet unit (2) is respectively connected with a plurality of actuators (8) through a plurality of reversing units (3), an inlet of the oil inlet unit (2) is connected with an outlet of a fixed flow main pump (13), the oil inlet unit (2) comprises a proportional flow valve (23), and a controller is connected to the proportional flow valve (23); the fixed flow main pump (13) is connected with the oil inlet unit (2) through a first one-way valve (12). The invention has the advantages of low cost and simple control strategy, and can improve the safety and reliability of the host.
Description
Technical Field
The invention belongs to the field of high-altitude vehicle hydraulic systems.
Background
An overhead working truck (for short, an overhead working truck) is used as engineering mechanical equipment taking a hydraulic system as a driving force, and is widely applied to industries such as ships, buildings, municipal construction, fire protection, ports and the like at present. The hydraulic system is a core power part of the overhead working truck, and the hydraulic system refers to a hydraulic system of a loading part, so that safety and reliability are required. The electric proportion control is a control mode which is frequently applied to a hydraulic multiway valve of a control element part in a hydraulic system, and the response is quick and the feedback is fine.
The hydraulic system of the high-altitude vehicle and the flow proportion distribution multi-way valve are mainly applicable to the hydraulic system of the constant displacement pump, and the single execution action of the high-altitude vehicle is realized by controlling the multi-way valve. The existing high-altitude vehicle control multi-way valve in the market mainly comprises full hydraulic control, electromagnetic switch valve control and electro-hydraulic proportional control multi-way valves. The control multi-way valve of the hydraulic system for the boarding car is characterized in that the oil inlet linkage limits the system pressure through the main overflow valve, then each working linkage directly drives and controls each valve core opening through each proportional electromagnet, so that flow proportional distribution of each working linkage is realized, each functional action of the boarding car is further realized, each proportional electromagnet is independently controlled, the control mode greatly improves the manufacturing cost of the multi-way valve, meanwhile, in the whole control multi-way valve, the control difficulty of each working linkage proportion is large, the control strategy is longer and more complex, and much flow waste is caused in the control part. And the host has poor stability and fine tuning, so that the host has poor safety and reliability.
Disclosure of Invention
The invention aims to provide a hydraulic system of an overhead vehicle and a control method. The invention has the advantages of low cost and simple control strategy, and can improve the safety and reliability of the host.
The technical scheme of the invention is as follows: the hydraulic system of the high-altitude vehicle comprises a hydraulic power system and a control multi-way valve, wherein the hydraulic power system comprises a fixed flow main pump, an inlet of the fixed flow main pump is connected with an oil tank, and an oil return filter is arranged on the oil tank;
the control multi-way valve comprises an oil inlet unit, the oil inlet unit is respectively connected with a plurality of actuators through a plurality of reversing units, an inlet of the oil inlet unit is connected with an outlet of a fixed flow main pump, the oil inlet unit comprises a proportional flow valve, and a controller is connected to the proportional flow valve.
In the high-altitude vehicle hydraulic system, the fixed-flow main pump is connected with the oil inlet unit through the first one-way valve.
In the hydraulic system of the overhead vehicle, the hydraulic power system further comprises a fixed flow auxiliary pump, an inlet of the fixed flow auxiliary pump is connected with the oil tank, and an outlet of the fixed flow auxiliary pump is connected with the oil inlet unit through a second one-way valve.
In the high-altitude vehicle hydraulic system, the first one-way valve and the second one-way valve are connected with the oil inlet unit through the oil inlet filter.
In the high-altitude vehicle hydraulic system, the inlet of the fixed flow main pump and the inlet of the fixed flow auxiliary pump are connected with the oil tank through the stop valve and the oil filter in sequence.
In the high-altitude vehicle hydraulic system, the oil inlet unit further comprises a main overflow valve, a middle position unloading valve and a constant flow throttle valve, wherein an inlet of the main overflow valve, an inlet of the middle position unloading valve and an inlet of the proportional flow valve are all connected with an outlet of the oil inlet filter, an outlet of the main overflow valve and an outlet of the middle position unloading valve are all connected with an oil tank, an outlet of the proportional flow valve is connected with an inlet of each reversing unit, an outlet of the proportional flow valve is connected with the oil tank through the constant flow throttle valve, a pipeline between the proportional flow valve and the constant flow throttle valve is connected with a control port of the middle position unloading valve through the damping throttle valve, and a control port of the proportional flow valve is connected with the controller.
In the high-altitude vehicle hydraulic system, the reversing unit comprises a reversing valve, a P port of the reversing valve is connected with an outlet of the proportional flow valve, an A port of the reversing valve and a B port of the reversing valve are respectively connected with two ports of the actuator, and a T port of the reversing valve is connected with the oil tank.
According to the control method of the high-altitude vehicle hydraulic system, the controller is matched with the flow requirements of each actuator in operation, so that the proportional flow valve outputs flow as required, the actuators act, the constant flow throttle valve is normally open, and the outlet of the proportional flow valve is normally open with the oil tank.
Compared with the prior art, the invention replaces the original multiple proportional solenoid valves with the combination of one proportional solenoid valve and multiple reversing valves, and can improve the original independent control of each proportional solenoid to the centralized control of one proportional solenoid and multiple switch solenoids, thereby greatly reducing the cost of controlling the multi-way valve, namely greatly reducing the cost of a hydraulic system, avoiding redundant control strategies, reducing the waste of less flow and saving more energy.
The hydraulic bridge circuit composed of the proportional flow valve, the constant flow throttle valve, the damping throttle valve and the middle position unloading valve realizes accurate output of flow, the pressure difference between an inlet and an outlet of the proportional flow valve is kept constant, the flow fluctuation impact is reduced, various actions of the high-altitude vehicle are accurately controlled, the host computer is good in stability and fine tuning, and the safety and the reliability of the high-altitude vehicle are greatly improved.
In summary, the invention has the advantages of low cost and simple control strategy, and can improve the safety and reliability of the host.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of a hydraulic power system.
FIG. 3 is a schematic diagram of the rise of the arm amplitude.
Fig. 4 is a schematic diagram of the lowering of the arm amplitude.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Examples. The high-altitude vehicle hydraulic system is used for an existing high-altitude vehicle, the high-altitude vehicle is provided with a turntable, a first arm is arranged on the turntable, a first oil cylinder is arranged on the first arm, and the first oil cylinder enables the first arm to rotate for one-arm amplitude variation; the upper end of the first arm is hinged with a telescopic second arm, and a telescopic oil cylinder is arranged on the second arm and used for changing the length of the second arm; a second oil cylinder is arranged between the first arm and the second arm, and the second oil cylinder enables the second arm to rotate compared with the first arm to perform amplitude variation of the second arm; the upper end of the second arm is provided with an executing mechanism, a leveling system is arranged between the executing mechanism and the second arm, a leveling oil cylinder is arranged on the leveling system, and the executing mechanism is kept horizontal through the leveling oil cylinder. The first oil cylinder, the telescopic oil cylinder, the second oil cylinder and the leveling oil cylinder are a plurality of actuators 8 on the overhead vehicle.
As shown in fig. 1, the high-altitude vehicle hydraulic system comprises a hydraulic power system 1 and a control multi-way valve.
As shown in fig. 2, the hydraulic power system 1 comprises a fixed flow main pump 13 and a fixed flow auxiliary pump 18, wherein an inlet of the fixed flow main pump 13 and an inlet of the fixed flow auxiliary pump 18 are connected in parallel and then connected with an oil filter 15 through a stop valve 14, the oil filter 15 is connected with an outlet of an oil tank 16, and an inlet of the oil tank 16 is connected with an oil return end of a control multi-way valve through an oil return filter 17. The outlet of the fixed flow main pump 13 is provided with a first one-way valve 12, the outlet of the fixed flow auxiliary pump 18 is provided with a second one-way valve 19, and the outlet of the first one-way valve 12 and the outlet of the second one-way valve 19 are connected in parallel and then connected with the oil inlet end of the control multi-way valve through the oil inlet filter 11.
As shown in fig. 3, the control multi-way valve comprises an oil inlet unit 2, wherein the oil inlet unit 2 is respectively connected with a plurality of actuators 8 through a plurality of reversing units 3, and an inlet of the oil inlet unit 2 is connected with an outlet of an oil inlet filter 11.
The oil inlet unit 2 comprises a main overflow valve 21, a middle position unloading valve 22, a proportional flow valve 23, a constant flow throttle valve 24 and a HSC controller (Chinese is called as a layered storage controller), wherein an inlet of the main overflow valve 21, an inlet of the middle position unloading valve 22 and an inlet of the proportional flow valve 23 are all connected with an outlet of the oil inlet filter 11, an outlet of the main overflow valve 21 and an outlet of the middle position unloading valve 22 are all connected with an oil tank 16 through an oil return filter 17, an outlet of the proportional flow valve 23 is connected with an inlet of each reversing unit 3, an outlet of the proportional flow valve 23 is sequentially connected with the oil tank 16 through the constant flow throttle valve 24 and the oil return filter 17, a pipeline between the proportional flow valve 23 and the constant flow throttle valve 24 is connected with a control port of the middle position unloading valve 22 through the damping throttle valve 210, and a control port of the proportional flow valve 23 is connected with the controller. The controller is connected with the control handle of the high-altitude vehicle and receives signals of the control handle.
The reversing unit 3 comprises a reversing valve 31, a port P of the reversing valve 31 (i.e. an inlet of the reversing valve 31) is connected with an outlet of the proportional flow valve 23, a port A of the reversing valve 31 (one working oil port of the reversing valve 31) and a port B of the reversing valve 31 (the other working oil port of the reversing valve 31) are respectively connected with two oil inlet and outlet ports of the actuator 8, and a port T (oil return port) of the reversing valve 31 is connected with the oil tank 16 through an oil return filter 17.
The working principle and the control method are as follows: the operator of the high-altitude vehicle sends corresponding electric signals to the proportional electromagnet of the proportional flow valve 23 and the switch electromagnet of the reversing valve 31 through the operating handle, the valve core of the reversing valve 31 is pushed by the switch electromagnet to realize reversing, then the proportional flow valve 23 realizes the proportional distribution of the flow required by each working link according to a program control strategy, and the redundant flow output by the proportional flow valve 23 flows back to the oil tank 16 in a reversing way through the middle position unloading valve 22. Thereby realizing the actions of each executive component. When the controller detects that the proportional flow valve 23 has an action signal or is activated according to an electric signal sent by the operation handle, the proportional flow valve 23 precisely controls the flow rate supplied to each working link. The controller presets current, controls the opening, and controls the accurate flow distribution by program, so as to realize accurate flow distribution according to the requirement. The flow required by different working units only needs to change the built-in program of the controller, and the implementation mode is simple and reliable, and is fine and accurate. And the debugging is convenient, and the integration is high.
The following mainly describes the control of the neutral state of the valve core of the multi-way valve and the lifting action of the reversing unit 3 (one-arm amplitude variation), and other reversing units have similar working principles and are not repeated.
The process for controlling the neutral state of the multi-way valve comprises the following steps: when the control multi-way valve is in the middle position, the switch electromagnet of each reversing valve 31 does not supply electric signals, the proportional flow valve 23 is not powered, and is in the position of the proportional flow valve breaking circuit 26, when the pressure is lower than the set pressure of the main overflow valve 21, the middle position unloading valve 22 reverses the middle position unloading valve core to the middle position unloading valve through circuit 28 by overcoming the set pressure of a spring, and then flows into the oil return tank 16. All the functional actions of the high-altitude vehicle are in an initial state.
As shown in fig. 3, to realize the one-arm amplitude-variable lifting function of the high-altitude vehicle, the hydraulic system is started to work, the fixed flow main pump 13 and the fixed flow auxiliary pump 18 provide power sources, hydraulic oil enters the oil inlet unit 2, the proportional flow valve 23 is switched to the position 25 of the proportional flow valve through loop in the state that the proportional electromagnet 27 is powered on, the reversing valve 31 in the reversing unit 3 pushes the valve core in the reversing valve 31 to the working position 34 of the reversing valve 31 under the action of the switching electromagnet 36, the flow flows into the no-rod cavity of the one-arm amplitude-variable actuator 8, the oil cylinder stretches out, the one-arm amplitude-variable actuator 8 has rod cavity liquid to flow back to the oil tank 16 through the working position 34 of the reversing valve 31, and the high-altitude vehicle realizes the lifting function. During this dynamic process, the proportional flow valve 23 controls current through the HSC program according to a set control strategy, providing flow as needed, and excess flow will flow back to the tank through the neutral unloading valve 22. The neutral position unloading valve 22 is in dynamic balance in the system all the time under the action of the constant flow throttle valve 24 and the damping throttle valve 210, so that the unstable flow caused by the unstable proportional flow valve 23 is ensured. The constant-flow throttle valve 24 is always in a normally open state, so that flow fluctuation in a multi-way valve system is effectively solved through small flow, and the stable flow and the filtering function are achieved. The damping throttle valve 210 is a fixed damping to realize dynamic balance of the median unloading valve 22 during operation, and ensure constant and stable flow of the reversing link, so as to realize stable rising of the actuating mechanism.
As shown in fig. 4, to realize the one-arm amplitude-variable landing function of the high-altitude vehicle, the hydraulic system is started to work, the fixed flow main pump 13 and the fixed flow auxiliary pump 18 provide power sources, hydraulic oil enters the oil inlet unit 2, the proportional flow valve 23 is switched to the position of the proportional flow valve through loop 25 under the power-on state of the proportional electromagnet 27, the valve core in the reversing valve 31 is pushed to the B working position 33 of the reversing valve 31 by the reversing valve 31 under the action of the switching electromagnet 35, the flow flows into the rod cavity of the one-arm amplitude-variable actuator 8, the oil cylinder retracts, the rodless cavity liquid of the one-arm amplitude-variable actuator 8 flows back to the oil tank 16 through the B working position 33 of the reversing valve 31, and the high-altitude vehicle realizes the landing function.
Claims (8)
1. The high-altitude vehicle hydraulic system comprises a hydraulic power system (1) and a control multi-way valve, and is characterized in that: the hydraulic power system (1) comprises a fixed flow main pump (13), an inlet of the fixed flow main pump (13) is connected with an oil tank (16), and an oil return filter (17) is arranged on the oil tank (16);
the control multi-way valve comprises an oil inlet unit (2), the oil inlet unit (2) is respectively connected with a plurality of actuators (8) through a plurality of reversing units (3), an inlet of the oil inlet unit (2) is connected with an outlet of a fixed flow main pump (13), the oil inlet unit (2) comprises a proportional flow valve (23), and a controller is connected to the proportional flow valve (23).
2. The overhead vehicle hydraulic system of claim 1, wherein: the fixed flow main pump (13) is connected with the oil inlet unit (2) through a first one-way valve (12).
3. The overhead vehicle hydraulic system of claim 2, wherein: the hydraulic power system (1) further comprises a fixed flow auxiliary pump (18), an inlet of the fixed flow auxiliary pump (18) is connected with an oil tank (16), and an outlet of the fixed flow auxiliary pump (18) is connected with the oil inlet unit (2) through a second one-way valve (19).
4. A high-altitude vehicle hydraulic system as claimed in claim 3, wherein: the first one-way valve (12) and the second one-way valve (19) are both connected with the oil inlet unit (2) through the oil inlet filter (11).
5. A high-altitude vehicle hydraulic system as claimed in claim 3, wherein: the inlet of the fixed flow main pump (13) and the inlet of the fixed flow auxiliary pump (18) are connected with the oil tank (16) through the stop valve (14) and the oil filter (15) in sequence.
6. The overhead vehicle hydraulic system of claim 4, wherein: the oil inlet unit (2) further comprises a main overflow valve (21), a middle position unloading valve (22) and a constant flow throttle valve (24), wherein an inlet of the main overflow valve (21), an inlet of the middle position unloading valve (22) and an inlet of the proportional flow valve (23) are all connected with an outlet of the oil inlet filter (11), an outlet of the main overflow valve (21) and an outlet of the middle position unloading valve (22) are both connected with an oil tank (16), an outlet of the proportional flow valve (23) is connected with an inlet of each reversing unit (3), an outlet of the proportional flow valve (23) is connected with the oil tank (16) through the constant flow throttle valve (24), a pipeline between the proportional flow valve (23) and the constant flow throttle valve (24) is connected with a control port of the middle position unloading valve (22) through the damping throttle valve (210), and a control port of the proportional flow valve (23) is connected with a controller.
7. The overhead vehicle hydraulic system of claim 6, wherein: the reversing valve (31) is arranged on the reversing link (3), the P port of the reversing valve (31) is connected with the outlet of the proportional flow valve (23), the A port of the reversing valve (31) and the B port of the reversing valve (31) are respectively connected with two ports of the actuator (8), and the T port of the reversing valve (31) is connected with the oil tank (16).
8. The control method of the high-altitude vehicle hydraulic system according to claim 6, characterized in that: the controller is matched with the flow requirements of each actuator (8) in operation, so that the proportional flow valve (23) outputs flow as required, the actuators (8) are operated, the constant flow throttle valve (24) is normally open, and the outlet of the proportional flow valve (23) is normally open with the oil tank (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311157980.1A CN117185213A (en) | 2023-09-08 | 2023-09-08 | High-altitude vehicle hydraulic system and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311157980.1A CN117185213A (en) | 2023-09-08 | 2023-09-08 | High-altitude vehicle hydraulic system and control method |
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| Publication Number | Publication Date |
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| CN117185213A true CN117185213A (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311157980.1A Pending CN117185213A (en) | 2023-09-08 | 2023-09-08 | High-altitude vehicle hydraulic system and control method |
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| CN (1) | CN117185213A (en) |
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- 2023-09-08 CN CN202311157980.1A patent/CN117185213A/en active Pending
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