CN202732515U - Flow control hydraulic system and engineering machine - Google Patents
Flow control hydraulic system and engineering machine Download PDFInfo
- Publication number
- CN202732515U CN202732515U CN 201220340647 CN201220340647U CN202732515U CN 202732515 U CN202732515 U CN 202732515U CN 201220340647 CN201220340647 CN 201220340647 CN 201220340647 U CN201220340647 U CN 201220340647U CN 202732515 U CN202732515 U CN 202732515U
- Authority
- CN
- China
- Prior art keywords
- flow control
- valve
- oil
- line
- hydraulic system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model provides a flow control hydraulic system, which comprises a pressure oil source, a reversing valve, an actuating mechanism, a flow control valve, a first one-way valve, a pressure detection unit and a control unit, wherein the pressure oil source supplies oil through an oil inlet line and the actuating mechanism returns oil through an oil return line; the flow control valve is arranged on the oil return line, the inlet of the first one-way valve is connected onto the oil return line between the actuating mechanism and the flow control valve, and the outlet of the first one-way valve is connected onto the oil inlet line; the pressure detection unit is arranged on the oil inlet line; and the control unit is connected with the pressure detection unit and the flow control valve and is used for controlling the spool opening of the flow control valve to adjust the flow of oil which flows to the oil inlet valve from the first one-way valve. The utility model additionally provides an engineering machine. In the flow control hydraulic system, the flow demand of the actuating mechanism is obtained according to the demands for loaded operation under working conditions, the return oil of the actuating mechanism is controlled to be replenished into the oil inlet line, the demands for operation under multiple working conditions are met and the working stability of the system is improved.
Description
Technical field
The utility model relates to technical field of hydraulic, in particular to the engineering machinery of a kind of flow control hydraulic system and this flow control hydraulic system of application.
Background technique
In hydraulic system, to actuator's discharge pressure oil, oil return flow in the fuel tank by oil circuit oil hydraulic pump, with the action of driving actuator, thereby realizes corresponding function by in-line.In actual moving process, it is empty to cause system to be inhaled when oil sources supplies shortage of oil, thereby so that the phenomenons such as pause, shake appear in actuator, has a strong impact on the stability of system's operation.
In the working procedure of hydraulic system, can adopt differential Placement to address the above problem, but differential linkage structure so that reducing, the driving force of actuator is only applicable to the operating mode of low load, and application area is less.
The model utility content
The utility model proposes a kind of flow control hydraulic system, satisfy the job requirements of multi-operating mode, improved the stability of hydraulic system.
The utility model provides a kind of flow control hydraulic system, comprise pressure oil-source, selector valve and actuator, described selector valve is used for controlling the action of described actuator, also comprises: flow control valve, the first one-way valve, pressure sensing cell and control unit;
Described pressure oil-source is described actuator fuel feeding by in-line, and described actuator carries out oil return by oil circuit; Described flow control valve is arranged on the described oil circuit, and the import of described the first one-way valve is connected on the oil circuit between described actuator and the described flow control valve, and the outlet of described the first one-way valve is connected on the described in-line;
Described pressure sensing cell for detection of oil circuit pressure is arranged on the described in-line;
Described control unit and described pressure sensing cell be connected flow control valve and be connected, the oil circuit pressure that detects according to described pressure sensing cell, control the spool aperture of described flow control valve, to regulate the fluid flow that flows to described in-line through described the first one-way valve.
In technique scheme, preferably, the import of described the first one-way valve is connected on the oil circuit between described selector valve and the described flow control valve, and the outlet of described the first one-way valve is connected on the in-line between described pressure oil-source and the described selector valve.
In above-mentioned arbitrary technological scheme, preferably, described pressure sensing cell is arranged on the in-line between described pressure oil-source and the described selector valve.
In above-mentioned arbitrary technological scheme, preferably, also comprise: the second one-way valve is arranged on the in-line between described pressure oil-source and the described selector valve.
In above-mentioned arbitrary technological scheme, preferably, described selector valve is four-way type selector valve.
In above-mentioned arbitrary technological scheme, preferably, described selector valve is five-way type selector valve, described five-way type selector valve comprises a P mouth and two T mouths, two T mouths carry out oil return by the first oil circuit and the second oil circuit respectively, are provided with flow control valve and connect this oil circuit to the first one-way valve of in-line at least one oil circuit.
In above-mentioned arbitrary technological scheme, preferably, described flow control valve is Proportional valve.
The utility model also provides a kind of engineering machinery, comprises such as the described flow control hydraulic system of arbitrary technological scheme in the above-mentioned technological scheme.
In the utility model, in-line pressure by the pressure sensing cell detection, obtain executive component and drive the traffic demand that loads on operation under the different operating modes, the spool aperture of control unit and then control flow control valve, adjusting flows to the fluid flow of in-line through the first one-way valve, the oil return of actuator is filled in the in-line: according to the operating mode job requirements of load, when the fluid of in-line is under-supply, system pressure descends, the in-line pressure that this moment, pressure sensing cell detected is lower than desired value, control unit can reduce the spool aperture of flow control valve, actuator reduces by the recirculating oil quantity of flow control valve to fuel tank, and more oil return fills in the in-line by the first one-way valve, and this moment, the oil mass of in-line was sufficient, system pressure rises gradually, has satisfied the operating mode job requirements of load; Operating mode job requirements according to load, when the fluid supply of in-line is too much, system pressure rises, the in-line pressure that this moment, pressure sensing cell detected is higher than desired value, control unit can the augmented flow control valve the spool aperture, actuator increases by the recirculating oil quantity of flow control valve to fuel tank, the recirculating oil quantity that fills in the in-line by the first one-way valve reduces, system pressure descends gradually, has satisfied the operating mode job requirements of load; In the flow control hydraulic system, constantly dynamically adjust according to above-mentioned principle, guaranteed the as required supply of flow system flow, take full advantage of the oil return of actuator, improved the working stability of flow control hydraulic system.
Description of drawings
Fig. 1 is the structural representation of flow control hydraulic system among the utility model the first embodiment;
Fig. 2 is the structural representation of flow control hydraulic system among the utility model the second embodiment;
Fig. 3 is the structural representation of flow control hydraulic system among the utility model the 3rd embodiment;
Fig. 4 is the structural representation of flow control hydraulic system among the utility model the 4th embodiment;
Fig. 5 is the structural representation of flow control hydraulic system among the utility model the 5th embodiment.
Embodiment
In order more clearly to understand above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the drawings and specific embodiments the utility model is further described in detail.In the situation of not conflicting, the application's embodiment and the feature among the embodiment can make up mutually.
Below in conjunction with Fig. 1 to Fig. 5, the technological scheme of flow control hydraulic system in the utility model is elaborated.
With reference to accompanying drawing, a kind of flow control hydraulic system that the utility model proposes, comprise: pressure oil-source 1, selector valve 2 and actuator 3, selector valve 2 is used for the action of control actuator 3, also comprises: flow control valve 4, the first one-way valve 5, pressure sensing cell 6 and control unit 7;
Wherein, pressure oil-source 1 is actuator's 3 fuel feeding by in-line, and actuator 3 carries out oil return by oil circuit; Flow control valve 4 is arranged on the oil circuit, and the import of the first one-way valve 5 is connected on the oil circuit between actuator 3 and the flow control valve 4, and the outlet of the first one-way valve 5 is connected on the in-line; Pressure sensing cell 6 for detection of oil circuit pressure is arranged on the in-line, and pressure sensing cell 6 can be pressure transducer; Control unit 7 and pressure sensing cell 6 are connected with flow control valve and are connected, and according to the oil circuit pressure that pressure sensing cell 6 detects, the spool aperture of control flow control valve 4 is to regulate the fluid flow that flows to in-line through the first one-way valve 5.
In the flow control hydraulic system, by detecting the in-line pressure of actuator 3, obtain actuator 3 and drive the traffic demand that loads on operation under the different operating modes, the spool aperture of control unit 7 and then control flow control valve 4, adjusting flows to the fluid flow of in-line through the first one-way valve 5, the oil return of actuator 3 is filled in the in-line, and concrete adjustment process is as follows:
Operating mode job requirements according to load, when the fluid of in-line is under-supply, system pressure descends, the in-line pressure that this moment, pressure sensing cell 6 detected is lower than desired value, and control unit 7 can reduce the spool aperture of flow control valve 4, and actuator 3 reduces by the recirculating oil quantity of flow control valve 4 to fuel tank, more oil return fills in the in-line by the first one-way valve 5, this moment, the in-line oil mass was sufficient, and system pressure rises gradually, has satisfied the operating mode job requirements of load; Operating mode job requirements according to load, when the fluid supply of in-line is too much, system pressure rises, the in-line pressure that this moment, pressure sensing cell 6 detected is higher than desired value, control unit 7 can augmented flow control valve 4 the spool aperture, actuator 3 increases by the recirculating oil quantity of flow control valve 4 to fuel tank, the recirculating oil quantity that fills in the in-line by the first one-way valve 5 reduces, system pressure descends gradually, has satisfied the operating mode job requirements of load.
In the flow control hydraulic system, constantly dynamically adjust according to above-mentioned principle, guaranteed the as required supply of flow system flow, take full advantage of the oil return of actuator 3, satisfy the job requirements of multi-operating mode, improved the working stability of flow control hydraulic system.
In actual application, according to the in-line pressure that detects with control flow control valve 4 the spool aperture time, be associated between spool aperture and the in-line pressure, for example, it is less to detect in-line pressure at pressure sensing cell 6, the spool aperture of control unit 7 control flow control valves 4 increases, thereby more oil return is filled in the in-line, realizes Systems balanth work; Vice versa.
In the technique scheme, pressure sensing cell 6 is arranged in the oil circuit, detect with the oil liquid pressure to in-line, can obtain in real time the traffic demand of actuator 3, by the spool aperture of control flow control valve 4, enter the oil return flow of oil circuit with adjusting, take full advantage of the oil return of actuator 3, can satisfy the multi-operating mode job requirements of load, guarantee the working stability of flow control hydraulic system.
In specific embodiment, pressure sensing cell 6 can further describe the position of pressure sensing cell 6 on in-line for detection of the pressure of in-line.
In Fig. 1, pressure sensing cell 6 is arranged on the in-line between selector valve 2 and the actuator 3, pressure sensing cell 6 can obtain the in-line pressure of actuator 3 more exactly, and be not subjected to the interference of other hydraulic element in the in-line, drive the traffic demand that loads under the different operating mode operations thereby can obtain real-time and accurately actuator 3.
In Fig. 2, pressure sensing cell 6 can also be arranged in the outlet and the in-line between the selector valve 2 of pressure oil-source 1, can detect the in-line pressure of actuator 3.
In specific embodiment, the oil return of actuator 3 flows in the in-line by the first one-way valve 5, can be further the setting of the first one-way valve 5 be described.
Such as Fig. 1 or shown in Figure 2, the import of the first one-way valve 5 can be connected on the oil circuit between the filler opening of selector valve 2 and flow control valve 4, and the outlet of the first one-way valve 5 is connected on the in-line between described pressure oil-source 1 and the described selector valve 2, when carrying out flow control, the oil return of the actuator 3 T mouth from selector valve 2 is flowed out, flow to the P mouth of selector valve 2 through the first one-way valve 5.
In a preferred embodiment, the import of the first one-way valve 5 can be connected on the oil circuit between actuator 3 and the selector valve 2, the outlet of the first one-way valve 5 is connected on the in-line between described pressure oil-source 1 and the described selector valve 2; Perhaps, the import of the first one-way valve 5 is connected between the filler opening of selector valve 2 and flow control valve 4, the outlet of the first one-way valve 5 is connected to the in-line between selector valve 2 and the actuator 3.
In Fig. 3, on the basis of above-mentioned flow control hydraulic system, comprise that also the second one-way valve 9, the second one-way valves 9 are arranged on the in-line between described pressure oil-source 1 and the described selector valve 2.By the second one-way valve 9 is set, the fluid in the in-line is merely able to along 2 direction flows from pressure oil-source 1 to selector valve; In carrying out flow control process, the oil return of actuator 3 flow on the in-line by the first one-way valve 5, can avoid the oil return of this part to flow to pressure oil-source 1 by the second one-way valve 9 is set, and guarantees the trouble-free operation of hydraulic system.
Be provided with relief valve 10 in this flow control hydraulic system, the liquid entering hole of this relief valve 10 is arranged on the outlet of pressure oil-source 1, and the liquid outlet of relief valve 10 is connected to fuel tank.
In the technological scheme of Fig. 1 to Fig. 3, pressure oil-source 1 is oil pump, selector valve 2 is four-way type selector valve, for example, three position four-way directional control valve shown in the figure, actuator 3 is oil cylinder, oil pump is the oil cylinder fuel feeding by in-line, and oil cylinder carries out oil return by oil circuit, wherein, the P mouth of three position four-way directional control valve is connected with the outlet of oil pump, the A mouth of three position four-way directional control valve, the B mouth respectively with the rod chamber of oil cylinder, rodless cavity connects, and the T mouth of three position four-way directional control valve is connected to fuel tank, and flow control valve 4 is arranged on the oil circuit, the import of the first one-way valve 5 is connected on the oil circuit between actuator 3 and the flow control valve 4, and the outlet of the first one-way valve 5 is connected on the in-line.
In specific embodiment, selector valve 2 is not limited to four-way type selector valve in the utility model.
With reference to figure 4 and Fig. 5, in the flow control hydraulic system of the present utility model, selector valve 2 is five-way type selector valve, for example, and the type of three-position five-way shown in figure selector valve.For 3 position-5 way valve, the P mouth of 3 position-5 way valve is connected with the outlet of oil pump, the A mouth of 3 position-5 way valve, B mouth are connected with rod chamber, the rodless cavity of oil cylinder respectively, and 3 position-5 way valve has T1 and two return openings of T2, by T1 mouth and two oil circuits of T2 interruption-forming; Therefore, in order to realize goal of the invention of the present utility model, can the oil return of two oil circuits of T1 mouth and T2 interruption-forming be utilized, perhaps the oil return of one of them oil circuit utilized.
In Fig. 4, the import that flow control valve 4, the first one-way valves 5 are set at the oil circuit of T2 mouth is connected on the T2 mouth and the oil circuit between the flow control valve 4 of 3 position-5 way valve, and the outlet of the first one-way valve 5 is connected on the in-line; When spool is in the work of left position, pressure sensing cell 6 detects the pressure of in-line, the oil circuit pressure that control unit 7 detects according to pressure sensing cell 6, the spool aperture of control flow control valve 4 is to regulate the fluid flow that flows to in-line from the T2 mouth of 3 position-5 way valve through the first one-way valve 5.
In Fig. 5, on two oil circuits of T1 mouth and T2 mouth, flow control valve 41 and flow control valve 42 are set respectively, the import of one-way valve 51 is connected on the oil circuit between T1 mouth and the flow control valve 41, outlet is connected on the in-line, the import of one-way valve 52 is connected on the oil circuit between T2 mouth and the flow control valve 42, and outlet is connected on the in-line; Like this, when spool is in left position work or be in the work of right position, can be respectively two oil circuits by T2 mouth and T1 mouth oil return is utilized.
To embodiment shown in Figure 5, after 6 pairs of in-line pressure of pressure sensing cell detected, control unit 7 was according to the spool aperture of the in-line pressure control flow control valve 4 that detects, to regulate the oil sources flow that fills into in-line through the first one-way valve 5 at Fig. 1.
In addition, the utility model has also proposed a kind of engineering machinery, comprises the flow control hydraulic system in the technique scheme, and this project machinery has the beneficial effect of above-mentioned flow control hydraulic system.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (9)
1. a flow control hydraulic system comprises pressure oil-source, selector valve and actuator, and described selector valve is used for controlling the action of described actuator, it is characterized in that, also comprises: flow control valve, the first one-way valve, pressure sensing cell and control unit;
Described pressure oil-source is described actuator fuel feeding by in-line, and described actuator carries out oil return by oil circuit; Described flow control valve is arranged on the described oil circuit, and the import of described the first one-way valve is connected on the oil circuit between described actuator and the described flow control valve, and the outlet of described the first one-way valve is connected on the described in-line;
Described pressure sensing cell for detection of oil circuit pressure is arranged on the described in-line;
Described control unit and described pressure sensing cell be connected flow control valve and be connected, the oil circuit pressure that detects according to described pressure sensing cell, control the spool aperture of described flow control valve, to regulate the fluid flow that flows to described in-line through described the first one-way valve.
2. flow control hydraulic system according to claim 1, it is characterized in that, the import of described the first one-way valve is connected on the oil circuit between described selector valve and the described flow control valve, and the outlet of described the first one-way valve is connected on the in-line between described pressure oil-source and the described selector valve.
3. flow control hydraulic system according to claim 1 is characterized in that, described pressure sensing cell is arranged on the in-line between described pressure oil-source and the described selector valve.
4. flow control hydraulic system according to claim 1 is characterized in that, also comprises: the second one-way valve is arranged on the in-line between described pressure oil-source and the described selector valve.
5. each described flow control hydraulic system in 4 according to claim 1 is characterized in that described selector valve is four-way type selector valve.
6. flow control hydraulic system according to claim 5 is characterized in that, described flow control valve is Proportional valve.
7. each described flow control hydraulic system in 4 according to claim 1, it is characterized in that, described selector valve is five-way type selector valve, described five-way type selector valve comprises a P mouth and two T mouths, two T mouths carry out oil return by the first oil circuit and the second oil circuit respectively, are provided with flow control valve and connect this oil circuit to the first one-way valve of in-line at least one oil circuit.
8. flow control hydraulic system according to claim 7 is characterized in that, described flow control valve is Proportional valve.
9. an engineering machinery is characterized in that, comprises such as each described flow control hydraulic system in the claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220340647 CN202732515U (en) | 2012-07-13 | 2012-07-13 | Flow control hydraulic system and engineering machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220340647 CN202732515U (en) | 2012-07-13 | 2012-07-13 | Flow control hydraulic system and engineering machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202732515U true CN202732515U (en) | 2013-02-13 |
Family
ID=47658218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220340647 Expired - Lifetime CN202732515U (en) | 2012-07-13 | 2012-07-13 | Flow control hydraulic system and engineering machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202732515U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993623A (en) * | 2014-05-27 | 2014-08-20 | 中联重科股份有限公司渭南分公司 | Excavator, bucket hydraulic system thereof and method for controlling bucket excavating speed of excavator |
| CN108729479A (en) * | 2018-05-28 | 2018-11-02 | 柳州柳工挖掘机有限公司 | Bucket rod cylinder of excavator hydraulic control system and control method |
| CN109654079A (en) * | 2017-10-12 | 2019-04-19 | 华东交通大学 | The outlet throttling load port separate control valves that full switch valve group is closed |
-
2012
- 2012-07-13 CN CN 201220340647 patent/CN202732515U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993623A (en) * | 2014-05-27 | 2014-08-20 | 中联重科股份有限公司渭南分公司 | Excavator, bucket hydraulic system thereof and method for controlling bucket excavating speed of excavator |
| CN109654079A (en) * | 2017-10-12 | 2019-04-19 | 华东交通大学 | The outlet throttling load port separate control valves that full switch valve group is closed |
| CN109654079B (en) * | 2017-10-12 | 2024-02-20 | 华东交通大学 | Full-switch valve combined outlet throttle load port independent control valve |
| CN108729479A (en) * | 2018-05-28 | 2018-11-02 | 柳州柳工挖掘机有限公司 | Bucket rod cylinder of excavator hydraulic control system and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106759621B (en) | Load-sensitive formula loading machine determines variable delivery hydraulic system | |
| CN108658019B (en) | A kind of working bucket leveling system of high-altitude operation vehicle | |
| CN102588359B (en) | Hydraulic system, excavator and control method of hydraulic system | |
| CN103122648B (en) | Multi-way valve hydraulic control system, rectilinear walking control valve and excavator | |
| CN202251199U (en) | Electro-hydraulic proportional combined maneuvering valve | |
| CN104141326A (en) | Energy-saving control system for excavator | |
| CN109695599B (en) | Variable hydraulic system, pump output flow control method and engineering machinery | |
| CN102042273B (en) | Hydraulic control circuit and method | |
| CN106402059A (en) | Load port individual valve, hydraulic bus control system and engineering machinery | |
| CN104989692B (en) | Compound control-type variable pump and control method thereof | |
| CN110005649B (en) | Load-sensitive adjustable hydraulic system of drilling machine and drilling machine | |
| CN105485080A (en) | Rotary motor control system and control method thereof | |
| CN202732515U (en) | Flow control hydraulic system and engineering machine | |
| CN103982475B (en) | A kind of concrete ejection car jib hydraulic control system | |
| CN203114764U (en) | Load-sensitive electro-hydraulic proportional multi-way valve | |
| CN102506030B (en) | Multi-way valve and tunnel boring machine | |
| CN102434507B (en) | Engineering machinery and load sensitivity control system and control method thereof | |
| CN107477160B (en) | Hydraulic speed regulation system and engineering machinery | |
| CN203516247U (en) | Bulldozer hydraulic sensing device | |
| CN202544013U (en) | Excavator hydraulic system and excavator | |
| CN106015138B (en) | A kind of synchronization hydraulic system and crane | |
| CN102155446B (en) | Segmental control integration-type electro-hydraulic digital valve | |
| CN206988194U (en) | A kind of flow prior control loop | |
| CN103256334B (en) | Double-act-ing hydraulic J-Horner tractor suspension hydraulic system based on electromagnetic digital valve | |
| CN103912532B (en) | A kind of double spool PLC technology hydrovalve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SANY AUTOMOBILE MANUFACTURING CO., LTD. Free format text: FORMER OWNER: SANYI HEAVY INDUSTRY CO LTD Effective date: 20130502 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130502 Address after: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city Patentee after: Sany Automobile Manufacturing Co.,Ltd. Address before: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city Patentee before: SANY HEAVY INDUSTRY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |