CN113152575A - Hydraulic bridge circuit based set pilot positive flow control system - Google Patents
Hydraulic bridge circuit based set pilot positive flow control system Download PDFInfo
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- CN113152575A CN113152575A CN202110545026.4A CN202110545026A CN113152575A CN 113152575 A CN113152575 A CN 113152575A CN 202110545026 A CN202110545026 A CN 202110545026A CN 113152575 A CN113152575 A CN 113152575A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an integrated pilot positive flow control system based on a hydraulic bridge circuit. The first hydraulic control reversing valve control oil port a and the control oil port b are correspondingly connected with the oil inlet of the first oil way selector valve; the oil outlet of the first oil way selection valve is respectively connected with the oil inlet of the second pressure control valve and the oil inlet of the second one-way valve; the control oil port c and the control oil port d of the second hydraulic control reversing valve are correspondingly connected with the oil inlet of the second oil way selector valve; the oil outlet of the second oil way selection valve is respectively connected with the oil inlet of the first pressure control valve and the oil inlet of the first one-way valve; the oil outlet of the second one-way valve, the oil outlet of the first pressure control valve, the oil outlet of the second pressure control valve and the oil outlet of the first one-way valve are connected with a servo proportional piston. According to the invention, different pilot pressures under the composite action of the excavator are simultaneously applied to the servo proportional piston, and the discharge capacity of the variable pump is controlled in a mode of generating resultant force by superposition, so that the system main pump and the pilot signal are coordinated and matched, and meanwhile, the system has higher response and improves the reliability in the action process.
Description
Technical Field
The invention relates to a hydraulic excavator, in particular to an integrated pilot positive flow control system based on a hydraulic bridge circuit, which is suitable for an excavator hydraulic system controlled by using a hydraulic control positive flow mode.
Background
The hydraulic system is an important component of the excavator, the design and improvement of the hydraulic system have extremely important significance on the improvement of the performance of the excavator, and in the hydraulic system, a real-time flow matching mode is also one of core technologies of the hydraulic excavator.
The traditional hydraulic control positive flow system of the excavator adopts a shuttle valve group to select the highest pilot pressure to control the displacement of a hydraulic pump. The method specifically comprises the following steps: when the system is in a composite action working condition, the highest pressure selected by the shuttle valves with different handles can select the highest control pressure through the shuttle valve group and is used as the control pressure of the hydraulic pump to control the flow of the hydraulic pump, and the control mode has the defects that:
1. because the flow of the variable pump can be adjusted only according to the highest pilot control oil pressure, under certain specific working conditions, the flow of the variable pump cannot be accurately controlled through the pilot control oil pressure according to the flow required by each actuating mechanism;
2. a series of shuttle valves are required in the control system, which tends to complicate the system structure, resulting in increased engine power consumption and increased energy loss.
Disclosure of Invention
In order to solve the technical problem, the invention provides a set pilot positive flow control system based on a hydraulic bridge circuit.
The invention is realized by the following technical scheme: an integrated pilot positive flow control system based on a hydraulic bridge circuit comprises an oil outlet of a variable pump, a first hydraulic control reversing valve and a second hydraulic control reversing valve, wherein the first hydraulic control reversing valve and the second hydraulic control reversing valve are connected with the oil outlet of the variable pump; the first operating handle is connected with a control oil port a and a control oil port b of the first hydraulic control reversing valve; the second operating handle is connected with a control oil port c and a control oil port d of the second hydraulic control reversing valve; the control oil port a and the control oil port b are correspondingly connected with two oil inlets of the first oil way selector valve; an oil outlet of the first oil way selection valve is respectively connected with an oil inlet of a second pressure control valve and an oil inlet of a second one-way valve; the control oil port c and the control oil port d are correspondingly connected with two oil inlets of the second oil way selector valve; an oil outlet of the second oil way selection valve is respectively connected with an oil inlet of the first pressure control valve and an oil inlet of the first one-way valve; the oil outlet of the second one-way valve and the oil outlet of the first pressure control valve are connected with a servo proportional piston; the oil outlet of the second pressure control valve and the oil outlet of the first one-way valve are connected with a servo proportional piston; the front end of the servo proportional piston is connected with a variable mechanism of the variable pump.
It further comprises the following steps: the first oil path selection valve and the second oil path selection valve are shuttle valves.
The first pressure control valve and the second pressure control valve are sequence valves.
The first pressure control valve and the second pressure control valve are controlled by adopting an electromagnetic proportion.
And the first operating handle is connected with a control oil port a and a control oil port b of the first hydraulic control reversing valve by adopting electric proportional signals for control.
And the second operating handle is connected with a control oil port c and a control oil port d of the second hydraulic control reversing valve for control by adopting electric proportional signals.
The first one-way valve and the second one-way valve adopt logic valves with one-way stopping functions.
And the oil inlet and the oil outlet of the first hydraulic control reversing valve are connected with a rotary motor.
And the oil inlet and the oil outlet of the second hydraulic control reversing valve are connected with a hydraulic oil cylinder.
Compared with the prior art, the invention has the beneficial effects that:
different pilot pressures under the composite action of the excavator are simultaneously applied to the servo proportional piston, and the displacement of the variable displacement pump is controlled in a mode of generating resultant force by superposition, so that the condition that the supply flow of the hydraulic pump is insufficient under the composite action of the excavator under a specific extreme working condition is realized;
the oil way selection valve is adopted to select the high-low pressure oil ways at the two ends of the operating handle, the structure is simple, and the response is quick; the one-way valve can make the oil in one-way conduction, and prevent the operation rod from influencing the maneuverability when in compound action; the pressure control valve can realize the protection function of pilot control pressure, and prevent the pressure from generating strong impact due to overhigh pressure, and meanwhile, after the pressure control valve is opened, oil liquid of the two oil ways can be simultaneously superposed on the servo proportional piston, so that the pressure generated by the pilot cannot be counteracted, and the control precision of the pilot is influenced;
the invention can improve the main pump displacement adjustment pilot control mode, enables the main pump of the system to be in coordination matching with the pilot signal, can more effectively exert the advantages of a hydraulic control positive flow system, and has higher response and improved reliability in the action process.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
in the figure: 1. the hydraulic control system comprises a rotary motor, 2, a first hydraulic control reversing valve, 3, a second hydraulic control reversing valve, 4, a first operating handle, 5, a second operating handle, 6, a first oil way selecting valve, 7, a second oil way selecting valve, 8, a first pressure control valve, 9, a first one-way valve, 10, a second one-way valve, 11, a second pressure control valve, 12, a servo proportional piston, 13, a variable pump, 14 and a hydraulic oil cylinder.
Detailed Description
The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.
Referring to fig. 1, in an integrated pilot positive flow control system based on a hydraulic bridge circuit, a hydraulic pump 13 is connected to an intermediate return line between a first hydraulic control directional control valve 2 and a second hydraulic control directional control valve 3, and is used for supplying oil to the first hydraulic control directional control valve 2 and the second hydraulic control directional control valve 3. The oil inlet and the oil outlet of the first hydraulic control reversing valve 2 are connected with a rotary motor 1. The oil inlet and the oil outlet of the second hydraulic control reversing valve 3 are connected with a hydraulic oil cylinder 14. The first operating handle 4 is connected with the control oil port a and the control oil port b of the first hydraulic control reversing valve 2 by adopting an electric proportional signal. The second operating handle 5 is connected with the control oil port c and the control oil port d of the second hydraulic control reversing valve 3 by adopting an electric proportional signal. The front end of the servo proportional piston 12 is connected with a variable mechanism of a variable pump 13.
The control oil port a and the control oil port b are correspondingly connected with two oil inlets of the first oil way selector valve 6; an oil outlet of the first oil path selection valve 6 is respectively connected with an oil inlet of a second pressure control valve 11 and an oil inlet of a second one-way valve 10. The control oil port c and the control oil port d are correspondingly connected with two oil inlets of the second oil way selector valve 7; an oil outlet of the second oil path selection valve 7 is respectively connected with an oil inlet of a first pressure control valve 8 and an oil inlet of a first one-way valve 9. The oil outlet of the second one-way valve 10 and the oil outlet of the first pressure control valve 8 are connected with a servo proportional piston 12. The oil outlet of the second pressure control valve 11 and the oil outlet of the first one-way valve 9 are connected with a servo proportional piston 12.
The first oil passage selector valve 6 and the second oil passage selector valve 7 are shuttle valves. The first oil path selector valve 6 can select the highest pressure of the first operation handle 4 to determine the rotation direction of the rotation motor 1 in the hydraulic system at that time. The second oil path selection valve 7 can select the highest pressure of the second operating handle 5, and the extending and retracting working conditions of the hydraulic oil cylinder 14 of the hydraulic system at the moment are judged.
The first pressure control valve 8 and the second pressure control valve 11 are sequence valves, electromagnetic proportional control is adopted, and oil drain ports of the sequence valves are directly connected with an oil tank after being connected. The sequence valve has the characteristics of high pressure regulating precision and accurate action, and meanwhile, the pressure loss value of oil passing through the sequence valve is close to zero, so that when the pressure is too high, the sequence valve can be opened, and a pressure oil way controls the servo proportional piston 12 through another oil way, thereby improving the safety and the reliability of the hydraulic system.
The first check valve 9 and the second check valve 10 are logic valves with one-way stop functions.
The displacement of the hydraulic pump is controlled in a hydraulic control mode, and compared with other control modes, the hydraulic pump omits a middle signal transmission link and has the advantages of high reliability, fast response and strong anti-interference performance. In the system, the highest pressure selected by the oil path selection valve acts on the servo proportional piston 12 through the one-way valve together, and because the areas of the acting valve cores are the same, the thrust generated by each operating handle and the pilot control pressure are in a linear correlation relationship, and the displacement of the servo proportional piston 12 can be linearly controlled, so that the displacement change of the variable displacement pump 13 is controlled.
The working principle is as follows:
when the excavator performs compound action, firstly the first oil path selector valve 6 and the second oil path selector valve 7 select the highest pilot pressure corresponding to the first operating handle 4 and the second operating handle 5, and oil is superposed and acted on the servo proportional piston 12 through a hydraulic bridge circuit, in the hydraulic bridge circuit, when the pressure reaches a certain upper limit, the highest pressure selected by each of the first oil path selector valve 6 and the second oil path selector valve 7 can only act on the servo proportional piston 12 through the first check valve 9 and the second check valve 10, and when the pressure exceeds the upper limit, the first pressure control valve 8 and the second pressure control valve 11 are opened, and the pressure oil paths are superposed and controlled through the other oil path to control the displacement of the servo proportional piston 12, so that the safety and the reliability of a hydraulic system are improved. And because the action areas are the same, the generated superposition force and the pilot control pressure are in a linear correlation relationship, the control of the variable pump 13 is facilitated, the advantages of a hydraulic control positive flow system can be more effectively exerted, the flow matching precision and the power utilization rate of the system are higher, and the energy loss is smaller.
Claims (9)
1. An integrated pilot positive flow control system based on a hydraulic bridge circuit comprises an oil outlet of a variable pump (13) which is connected with a first hydraulic control reversing valve (2) and a second hydraulic control reversing valve (3); the first operating handle (4) is connected with a control oil port a and a control oil port b of the first hydraulic control reversing valve (2); the second operating handle (5) is connected with a control oil port c and a control oil port d of the second hydraulic control reversing valve (3);
the method is characterized in that:
the control oil port a and the control oil port b are correspondingly connected with two oil inlets of the first oil way selector valve (6); an oil outlet of the first oil way selection valve (6) is respectively connected with an oil inlet of a second pressure control valve (11) and an oil inlet of a second one-way valve (10);
the control oil port c and the control oil port d are correspondingly connected with two oil inlets of the second oil way selector valve (7); an oil outlet of the second oil way selection valve (7) is respectively connected with an oil inlet of a first pressure control valve (8) and an oil inlet of a first one-way valve (9);
the oil outlet of the second one-way valve (10) and the oil outlet of the first pressure control valve (8) are connected with a servo proportional piston (12);
an oil outlet of the second pressure control valve (11) and an oil outlet of the first one-way valve (9) are connected with a servo proportional piston (12);
the front end of the servo proportional piston (12) is connected with a variable mechanism of a variable pump (13).
2. The aggregate piloted positive flow control system of claim 1, wherein: the first oil path selection valve (6) and the second oil path selection valve (7) are shuttle valves.
3. The aggregate piloted positive flow control system of claim 1, wherein: the first pressure control valve (8) and the second pressure control valve (11) are sequence valves.
4. A hydraulic bridge based collective pilot positive flow control system as set forth in claim 3, wherein: the first pressure control valve (8) and the second pressure control valve (11) are controlled by adopting electromagnetic proportion.
5. The aggregate piloted positive flow control system of claim 1, wherein: the first operating handle (4) is connected with and controlled by an electric proportional signal with a control oil port a and a control oil port b of the first hydraulic control reversing valve (2).
6. The aggregate piloted positive flow control system of claim 1, wherein: and the second operating handle (5) is connected and controlled with a control oil port c and a control oil port d of the second hydraulic control reversing valve (3) by adopting electric proportional signals.
7. The aggregate piloted positive flow control system of claim 1, wherein: the first check valve (9) and the second check valve (10) adopt logic valves with one-way stopping functions.
8. The aggregate piloted positive flow control system of claim 1, wherein: the oil inlet and the oil outlet of the first hydraulic control reversing valve (2) are connected with a rotary motor (1).
9. The aggregate piloted positive flow control system of claim 1, wherein: the oil inlet and the oil outlet of the second hydraulic control reversing valve (3) are connected with a hydraulic oil cylinder (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110545026.4A CN113152575B (en) | 2021-05-19 | 2021-05-19 | Hydraulic bridge circuit based set pilot positive flow control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110545026.4A CN113152575B (en) | 2021-05-19 | 2021-05-19 | Hydraulic bridge circuit based set pilot positive flow control system |
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| CN113152575A true CN113152575A (en) | 2021-07-23 |
| CN113152575B CN113152575B (en) | 2022-11-25 |
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Citations (13)
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|---|---|---|---|---|
| JPH08200306A (en) * | 1995-01-19 | 1996-08-06 | Nabco Ltd | Hydraulic circuit |
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| EP3020983A1 (en) * | 2014-11-14 | 2016-05-18 | Danfoss Power Solutions Aps | Valve group and inlet module of a valve group |
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| CN109488651A (en) * | 2018-12-19 | 2019-03-19 | 江苏徐工工程机械研究院有限公司 | A kind of multi-way valve and electric-control system |
| CN111734701A (en) * | 2020-06-29 | 2020-10-02 | 徐工集团工程机械股份有限公司科技分公司 | Engineering machine, positive flow hydraulic system and control method thereof |
| CN112177996A (en) * | 2020-09-18 | 2021-01-05 | 江苏徐工工程机械研究院有限公司 | Positive flow getting-on and getting-off composite stability control system and method |
-
2021
- 2021-05-19 CN CN202110545026.4A patent/CN113152575B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08200306A (en) * | 1995-01-19 | 1996-08-06 | Nabco Ltd | Hydraulic circuit |
| JP2003074517A (en) * | 2001-09-05 | 2003-03-12 | Kobelco Contstruction Machinery Ltd | Controlling method of hydraulic cylinder circuit |
| US20030106313A1 (en) * | 2001-12-10 | 2003-06-12 | Caterpillar Inc. | Electro-hydraulic valve control system and method |
| DE102006018706A1 (en) * | 2006-04-21 | 2007-10-25 | Robert Bosch Gmbh | Hydraulic control arrangement |
| CN102296665A (en) * | 2011-06-23 | 2011-12-28 | 上海三一重机有限公司 | Excavator hydraulic system carrying load sensing main valve and positive flow pump |
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| EP3258116A1 (en) * | 2016-06-15 | 2017-12-20 | HAWE Hydraulik SE | Hydraulic module with pressure-controlled 2-way flow control valve |
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| CN111734701A (en) * | 2020-06-29 | 2020-10-02 | 徐工集团工程机械股份有限公司科技分公司 | Engineering machine, positive flow hydraulic system and control method thereof |
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| CN113152575B (en) | 2022-11-25 |
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