CN110259741B - Quantitative composite control hydraulic system and engineering machinery - Google Patents
Quantitative composite control hydraulic system and engineering machinery Download PDFInfo
- Publication number
- CN110259741B CN110259741B CN201910542827.8A CN201910542827A CN110259741B CN 110259741 B CN110259741 B CN 110259741B CN 201910542827 A CN201910542827 A CN 201910542827A CN 110259741 B CN110259741 B CN 110259741B
- Authority
- CN
- China
- Prior art keywords
- valve
- signal
- working
- sensitive
- quantitative
- 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.)
- Active
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 39
- 150000001875 compounds Chemical class 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/003—Systems with load-holding valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a quantitative composite control hydraulic system and engineering machinery, comprising a first quantitative hydraulic pump, a second quantitative hydraulic pump and a hydraulic control system, wherein the first quantitative hydraulic pump is used for supplying hydraulic fluid for a working hydraulic cylinder; a first hydraulic pump of a certain amount for supplying hydraulic fluid to the working hydraulic cylinder through a signal valve; the signal valve is controlled by LS signal transmitted by the sensitive multiway valve and has a first state and a second state; when the sensitive multi-way valve works, a signal is transmitted to the signal valve, and a first quantitative hydraulic pump supplies hydraulic fluid to the working hydraulic cylinder through a first outlet of the signal valve; when the sensitive multi-way valve does not work, the signal valve is reset, the first hydraulic pump directly flows back to the hydraulic fluid tank through the second outlet of the signal valve, and in addition, the sensitive multi-way valve is matched with the signal valve, so that the compound control action of the working hydraulic cylinder is realized, and the working efficiency of the working device is improved.
Description
Technical Field
The invention relates to a quantitative composite control hydraulic system and engineering machinery, and belongs to the technical field of engineering machinery.
Background
In the prior art, most of hydraulic systems of engineering vehicles such as loaders and the like are quantitative core opening systems, the core opening systems have certain limitations in realizing compound actions, variable load sensitive systems appearing later use variable pumps and load sensitive valves, the cost is high, the systems are complex, and the core opening systems have certain limitations in practical popularization and application.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a quantitative composite control hydraulic system and engineering machinery.
The technical scheme is as follows: in order to solve the technical problems, the invention adopts the following technical scheme:
A quantitative compound control hydraulic system comprises a first quantitative hydraulic pump, a signal valve, a sensitive multi-way valve and a working hydraulic cylinder;
The first quantitative hydraulic pump supplies hydraulic fluid for the working hydraulic cylinder; the first quantitative hydraulic pump supplies hydraulic fluid to a sensitive multi-way valve through a signal valve;
The signal valve comprises a first outlet and a second outlet, the inlet of the signal valve is communicated with the first quantitative hydraulic pump, the first outlet is communicated with the inlet of the sensitive multiway valve, and the second outlet is communicated with the hydraulic fluid tank;
The signal valve is controlled by LS signals transmitted by the sensitive multi-way valve and has a first state and a second state;
When the sensitive multi-way valve works, a signal is transmitted to the signal valve, the signal valve is in a first state, an inlet of the signal valve is communicated with a first outlet, the first outlet of the signal valve feeds back a signal to one end of a valve core of the signal valve at the same time, and the signal valve core is compared with spring force and LS signals at the other end of the valve core of the signal valve to control the flow rate supplied to the sensitive multi-way valve;
When the sensitive multi-way valve does not work, the signal valve is reset to be in a second state, the inlet of the signal valve is communicated with the second outlet, and the first quantitative hydraulic pump directly flows back to the hydraulic fluid tank through the signal valve.
As a preferable scheme, the quantitative composite control hydraulic system further comprises a second quantitative hydraulic pump, a steering valve and a third working hydraulic cylinder, wherein the second quantitative hydraulic pump supplies hydraulic fluid for the third working hydraulic cylinder; the second quantitative hydraulic pump controls the flow through a steering valve, supplies hydraulic fluid of a third working hydraulic cylinder as required, and the redundant hydraulic fluid flows back to a hydraulic fluid tank.
Preferably, the quantitative composite control hydraulic system further comprises a steering gear, wherein the steering gear is connected with the steering valve and used for controlling the steering valve to change direction through the steering gear.
As a preferable scheme, the quantitative compound control hydraulic system is characterized in that the sensitive multi-way valve is a closed center sensitive multi-way valve, and the working hydraulic cylinder comprises a first working hydraulic cylinder and a second working hydraulic cylinder;
The sensitive multiway valve is provided with an inlet P, a first working port, a second working port, a pilot oil port, a control port X, a reflux port T and a feedback port LS; an inlet P of the sensitive multi-way valve is communicated with a first outlet of the signal valve, a first working port of the sensitive multi-way valve is communicated with the first working hydraulic cylinder, and a second working port of the sensitive multi-way valve is communicated with the second working hydraulic cylinder; the pilot oil port is communicated with the corresponding oil port of the pilot valve; the feedback port LS is connected with the signal valve and is used for feeding back signals to the signal valve.
Preferably, the quantitative compound control hydraulic system comprises a load maintaining valve, wherein the load maintaining valve is positioned between the second combined valve core and the working port A and used for maintaining the position of the second working hydraulic cylinder.
As a preferable scheme, the quantitative compound control hydraulic system is characterized in that the sensitive multi-way valve further comprises an LS flow valve, an inlet of the LS flow valve is connected with an LS oil circuit of the feedback port, and an outlet of the LS flow valve is communicated with the oil return channel L.
Preferably, the quantitative compound control hydraulic system further comprises an overflow valve, wherein an inlet of the overflow valve is communicated with an inlet P of the sensitive multi-way valve, and an outlet of the overflow valve is communicated with a backflow port T.
As a preferred scheme, the quantitative composite control hydraulic system further comprises a pressure reducing valve, wherein an inlet of the pressure reducing valve is communicated with a first outlet of the signal valve and an inlet P of the sensitive multi-way valve, and an outlet of the pressure reducing valve is respectively connected with a steering gear, a pilot valve P port and a control port X of the sensitive multi-way valve to respectively provide flow for the steering gear and the pilot valve; the pressure reducing valve provides pressure for the sensitive multi-way valve through the control port X;
when the sensitive multi-way valve changes direction, the pressure oil at the control port X passes through the second coupling valve core of the sensitive multi-way valve to the load holding valve, and the load holding valve is opened to ensure the normal action of the second working hydraulic cylinder.
On the other hand, the invention also provides engineering machinery comprising the quantitative composite control hydraulic system. Further, the engineering machinery comprises a loader.
The beneficial effects are that: according to the quantitative composite control hydraulic system provided by the invention, firstly, the signal valve is matched with the sensitive multi-way valve, and the sensitive multi-way valve is matched with the signal valve to realize the composite control action of the working hydraulic cylinder, so that the working efficiency of the working device is improved, and the problem of multi-mechanism composite control of the quantitative hydraulic system in the prior art is solved; secondly, through integrating the load and keep the valve in the sensitive multiway valve, with the control pressure that the relief pressure valve provided, control the opening and closing of load and keep the valve through the sensitive multiway valve case, the effectual big problem of current ration system working cylinder settlement volume of having solved to improve the working hydraulic cylinder and keep the difficult problem in position because of sensitive multiway valve leakage volume is big, thirdly, simple structure, the system is reliable, with low costs.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
In the figure: the hydraulic system comprises a second quantitative hydraulic pump 1, a steering gear 2, a steering valve 3, a third working hydraulic cylinder 4, a first quantitative hydraulic pump 5, a signal valve 6, a pressure reducing valve 7, a pilot valve 8, a sensitive multi-way valve 9, a first working hydraulic cylinder 10, a second working hydraulic cylinder 11, a load holding valve 12, an LS flow valve 13, an overflow valve 14 and a hydraulic fluid tank 15.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
As shown in fig. 1, a quantitative composite control hydraulic system and a construction machine are provided, comprising:
a first hydraulic pump 5 for supplying hydraulic fluid to the working cylinders; a second quantitative hydraulic pump 1 for supplying hydraulic fluid to a third working hydraulic cylinder 4;
The first quantitative hydraulic pump 5 supplies hydraulic fluid to the sensitive multi-way valve 9 through the signal valve 6, when the sensitive multi-way valve 9 works, a signal is transmitted to the signal valve 6, so that the first quantitative hydraulic pump 5 supplies hydraulic fluid to the working hydraulic cylinder, and when the working hydraulic cylinder does not work, the signal valve 6 is reset, and the second quantitative hydraulic pump directly returns to the hydraulic fluid tank.
The second quantitative hydraulic pump 1 controls the flow through the steering valve 3, supplies hydraulic fluid to the third working hydraulic cylinder 4 as required, meets the requirement of the third working hydraulic cylinder 4, and the redundant hydraulic fluid flows back to the hydraulic fluid tank 15 through heat dissipation.
In some embodiments, the working cylinders comprise a first working cylinder 10 and a second working cylinder 11.
In some embodiments, the third working cylinder 4 may be a steering cylinder. The steering valve 3 has a first state in which the piston rod of the steering cylinder is extended and a second state in which the piston rod of the steering cylinder is retracted.
Further, the signal valve 6 comprises a first outlet and a second outlet, the inlet of the signal valve 6 is communicated with the first quantitative hydraulic pump 5, the first outlet is communicated with the inlet of the sensitive multiway valve 9, and the second outlet is communicated with the hydraulic fluid tank 15; the signal valve 6 is controlled by the sensitive multi-way valve 9 transmitting LS signals and has a first state and a second state;
When the sensitive multi-way valve 9 works, LS signals are transmitted to the signal valve 6, the signal valve 6 is in a first state, an inlet of the signal valve 6 is communicated with a first outlet, the first outlet of the signal valve 6 feeds back signals to one end of a valve core of the signal valve 6 at the same time, and the signals are compared with spring force and LS signals at the other end of the valve core of the signal valve 6 to control the flow rate supplied to the sensitive multi-way valve 9;
When the sensitive multiway valve 9 is not working, the signal valve 6 is reset to be in the second state, the inlet of the signal valve 6 is communicated with the second outlet, and the first quantitative hydraulic pump 5 directly flows back to the hydraulic fluid tank 15 through the signal valve 6.
Further, the sensitive multi-way valve 9 is a closed center sensitive multi-way valve, the sensitive multi-way valve 9 is provided with an inlet P, first working ports A1 and B1, second working ports A2 and B2, a pilot oil port A1 and B1, a control port X, a reflux port T and a feedback port LS, the inlet P of the sensitive multi-way valve 9 is communicated with the outlet of the signal valve, the first working ports A1 and B1 of the sensitive multi-way valve 9 are communicated with the first working hydraulic cylinder 10, and the second working ports (A2 and B2) of the sensitive multi-way valve 9 are communicated with the second working hydraulic cylinder 11; the pilot oil ports a1 and b1 are communicated with corresponding oil ports of the pilot valve 8, and the feedback port LS is connected with the signal valve 6 and is used for feeding back signals to the signal valve 6.
More preferably, the sensitive multiplex valve 9 comprises a load holding valve 12, said load holding valve 12 being located between the second coupling spool and the working port A2 for holding the second working cylinder 11 in position.
More preferably, the sensitive multiway valve 9 further comprises an LS flow valve 13, wherein an inlet of the LS flow valve 13 is connected with an LS oil way, and an outlet of the LS flow valve is communicated with the oil return passage L.
More preferably, the sensitive multiway valve 9 further comprises an overflow valve 14, wherein an inlet of the overflow valve 14 is communicated with an inlet P of the sensitive multiway valve, and an outlet of the overflow valve is communicated with a backflow port T.
Furthermore, the quantitative compound control hydraulic system further comprises a pressure reducing valve 7, an inlet of the pressure reducing valve 7 is communicated with an outlet of the signal valve 6 and a port of the sensitive multiway valve P, the outlet is respectively connected with the steering gear 2, a control port X of the sensitive multiway valve and a port of the pilot valve P, flow is respectively provided for the steering gear 2 and the pilot valve 8, pressure is provided for the sensitive multiway valve 9 through the control port X, when the sensitive multiway valve 9 commutates, pressure oil at the control port X is connected to the load holding valve 12 through a second coupling valve core of the sensitive multiway valve 9, the load holding valve is opened, and normal action of the second working hydraulic cylinder 11 is ensured. When the valve rod is reversed, the pressure is communicated with the load holding valve 12, and the load holding valve 12 is opened, so that the large cavity of the second working hydraulic cylinder is communicated with the sensitive multi-way valve in oil return, and the normal action of the second working hydraulic cylinder is ensured.
In some embodiments, as shown in fig. 1, the second quantitative hydraulic pump 1 supplies hydraulic fluid to the steering valve 3, the steering valve 3 is controlled to steer through the steering gear 2, the steering valve steers to control the extension and retraction of the third working hydraulic cylinder 4, the steering valve 3 supplies hydraulic fluid to the third working hydraulic cylinder as required to meet the steering requirement, and the surplus hydraulic fluid flows back to the hydraulic fluid tank 15 through heat dissipation.
The first quantitative hydraulic pump 5 supplies hydraulic fluid to the signal valve 6, when the pilot valve 8 is not operated, the sensitive multi-way valve 9 is in the middle position, the feedback port LS is communicated with the low-pressure oil path through the LS flow valve 13, no pressure exists at the moment, the signal valve 6 is in the left position, and the first quantitative hydraulic pump 5 returns to the hydraulic fluid tank 15 through the left bit stream; when the sensitive multi-way valve 9 is small in opening, the feedback port LS feeds back signals to the signal valve 6, the signal valve 6 is positioned in the small opening to split, the flow requirement of the sensitive multi-way valve is met, and redundant hydraulic fluid flows back to the hydraulic fluid tank 15.
When the second working cylinder 11 moves to the limit position, the pressure of the relief valve 14 is reached, and relief is performed by the relief valve. When in the middle position, the inlet pressure of the sensitive multiway valve is maintained at 2MPa, and the diverter 2 and the pilot valve 8 can work through the pressure reducing valve 7. Secondly, when the sensitive multi-way valve 9 is in the middle position, a control signal of the load holding valve 12 is zero, the load holding valve ensures that the position of the second working hydraulic cylinder is unchanged, and when the sensitive multi-way valve 9 is in reversing, pressure oil at a control port X passes through a valve core of the sensitive multi-way valve to the load holding valve 12, the load holding valve is opened, and the second working hydraulic cylinder normally acts.
On the other hand, the engineering machinery comprises the quantitative composite control hydraulic system. Further, the engineering machinery comprises a loader.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. The quantitative compound control hydraulic system is characterized by comprising a first quantitative hydraulic pump (5), a signal valve (6), a sensitive multi-way valve (9) and a working hydraulic cylinder;
The first quantitative hydraulic pump (5) supplies hydraulic fluid for the working hydraulic cylinder; the first quantitative hydraulic pump (5) supplies hydraulic fluid to a sensitive multi-way valve (9) through a signal valve (6);
The signal valve (6) comprises a first outlet and a second outlet, the inlet of the signal valve (6) is communicated with the first quantitative hydraulic pump (5), the first outlet is communicated with the inlet of the sensitive multiway valve (9), and the second outlet is communicated with the hydraulic fluid tank (15);
the signal valve (6) is controlled by LS signals transmitted by the sensitive multiway valve (9) and has a first state and a second state;
When the sensitive multi-way valve (9) works, a signal is transmitted to the signal valve (6), the signal valve (6) is in a first state, an inlet of the signal valve (6) is communicated with a first outlet, the first outlet of the signal valve (6) feeds back a signal to one end of a valve core of the signal valve (6) at the same time, and the signal is compared with the spring force and LS signal at the other end of the valve core of the signal valve (6) to control the flow rate supplied to the sensitive multi-way valve (9);
when the sensitive multi-way valve (9) does not work, the signal valve (6) is reset to be in a second state, the inlet of the signal valve (6) is communicated with the second outlet, and the first quantitative hydraulic pump (5) directly flows back to the hydraulic fluid tank (15) through the signal valve (6).
2. The quantitative composite control hydraulic system according to claim 1, further comprising a second quantitative hydraulic pump (1), a steering valve (3), a third working hydraulic cylinder (4), the second quantitative hydraulic pump (1) supplying hydraulic fluid to the third working hydraulic cylinder (4); the second quantitative hydraulic pump (1) controls the flow through a steering valve (3), hydraulic fluid is supplied to the third working hydraulic cylinder (4) according to the requirement, and redundant hydraulic fluid flows back to a hydraulic fluid tank (15).
3. The quantitative compound control hydraulic system according to claim 2, further comprising a diverter (2), the diverter (2) being connected to the diverter valve (3) for controlling the reversing of the diverter valve (3) by the diverter (2).
4. The quantitative composite control hydraulic system according to claim 1, characterized in that the sensitive multiplex valve (9) is a closed-center sensitive multiplex valve, the working cylinders comprising a first working cylinder (10) and a second working cylinder (11);
The sensitive multiway valve (9) is provided with an inlet P, first working ports (A1 and B1) and second working ports (A2 and B2), pilot oil ports (A1 and B1), a control port X, a backflow port T and a feedback port LS; an inlet P of the sensitive multiway valve (9) is communicated with a first outlet of the signal valve (6), first working ports (A1 and B1) of the sensitive multiway valve (9) are communicated with the first working hydraulic cylinder (10), and second working ports (A2 and B2) of the sensitive multiway valve (9) are communicated with the second working hydraulic cylinder (11); the pilot oil ports (a 1 and b 1) are communicated with corresponding oil ports of the pilot valve (8); the feedback port LS is connected with the signal valve (6) and is used for feeding back signals to the signal valve (6).
5. The quantitative compound control hydraulic system according to claim 4, wherein the sensitive multiplex valve (9) comprises a load holding valve (12), the load holding valve (12) being located between the second duplex spool and the second working port (A2, B2) for holding the second working cylinder (11) in position.
6. The quantitative composite control hydraulic system according to claim 4, wherein the sensitive multi-way valve (9) further comprises an LS flow valve (13), an inlet of the LS flow valve (13) is connected with an LS oil circuit of the feedback port, and an outlet of the LS flow valve is communicated with the oil return passage L.
7. The quantitative composite control hydraulic system according to claim 4, wherein the sensitive multiplex valve (9) further comprises a relief valve (14), an inlet of the relief valve (14) is communicated with an inlet P of the sensitive multiplex valve, and an outlet is communicated with a return port T.
8. The quantitative composite control hydraulic system according to claim 4, further comprising a pressure reducing valve (7), wherein an inlet of the pressure reducing valve (7) is communicated with a first outlet of the signal valve (6) and a sensitive multi-way valve inlet P, and an outlet of the pressure reducing valve (7) is respectively connected with the steering gear (2), a pilot valve P port and a control port X of the sensitive multi-way valve (9) to respectively provide flow for the steering gear (2) and the pilot valve (8); the pressure reducing valve (7) provides pressure for the sensitive multiway valve (9) through the control port X;
When the sensitive multi-way valve (9) is switched, pressure oil at the control port X passes through a second coupling valve core of the sensitive multi-way valve (9) to a load holding valve (12), and the load holding valve is opened to ensure the normal action of a second working hydraulic cylinder (11).
9. A construction machine comprising a quantitative composite control hydraulic system according to any one of claims 1-8.
10. The work machine of claim 9, comprising a loader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910542827.8A CN110259741B (en) | 2019-06-21 | 2019-06-21 | Quantitative composite control hydraulic system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910542827.8A CN110259741B (en) | 2019-06-21 | 2019-06-21 | Quantitative composite control hydraulic system and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110259741A CN110259741A (en) | 2019-09-20 |
| CN110259741B true CN110259741B (en) | 2024-07-16 |
Family
ID=67920222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910542827.8A Active CN110259741B (en) | 2019-06-21 | 2019-06-21 | Quantitative composite control hydraulic system and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110259741B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833050B (en) * | 2021-09-24 | 2023-03-24 | 徐工集团工程机械股份有限公司 | Electrically controlled load sensitive hydraulic system of small excavator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210371407U (en) * | 2019-06-21 | 2020-04-21 | 徐工集团工程机械股份有限公司科技分公司 | Quantitative compound control hydraulic system and engineering machinery |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002129602A (en) * | 2000-10-25 | 2002-05-09 | Shin Caterpillar Mitsubishi Ltd | Construction machine with crane function |
| CN106480927B (en) * | 2016-11-02 | 2018-11-13 | 广西柳工机械股份有限公司 | Determine varying load sensitivity combining hydraulic system and loading machine |
| CN106759621B (en) * | 2017-01-04 | 2018-12-14 | 浙江高宇液压机电有限公司 | Load-sensitive formula loading machine determines variable delivery hydraulic system |
| CN107701532B (en) * | 2017-11-16 | 2023-11-28 | 恒天九五重工有限公司 | Negative flow multi-way valve hydraulic control system and control method thereof |
-
2019
- 2019-06-21 CN CN201910542827.8A patent/CN110259741B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210371407U (en) * | 2019-06-21 | 2020-04-21 | 徐工集团工程机械股份有限公司科技分公司 | Quantitative compound control hydraulic system and engineering machinery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110259741A (en) | 2019-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106480927B (en) | Determine varying load sensitivity combining hydraulic system and loading machine | |
| CN103047208B (en) | Load-sensitive electro-hydraulic proportional multi-way valve | |
| US20030159577A1 (en) | Hydraulic control circuit for operating a split actuator mechanical mechanism | |
| CN208346897U (en) | Loader hydraulic system | |
| CN102865387B (en) | Electric proportional multi-way valve | |
| CN107882798B (en) | Load simulation valve and loading machine variable system | |
| CN110005649B (en) | Load-sensitive adjustable hydraulic system of drilling machine and drilling machine | |
| CN103085865A (en) | Load sensitive turning hydraulic system of loading machine | |
| CN113464514A (en) | Integrated electric control multi-way valve and crane | |
| CN104029721A (en) | Hydraulic steering device for loader | |
| CN111733921A (en) | Loader hydraulic system and engineering machinery | |
| CN109306976B (en) | Load sensitive control system | |
| CN110259741B (en) | Quantitative composite control hydraulic system and engineering machinery | |
| CN113494111B (en) | Main control valve, fixed variable hydraulic system and loader | |
| CN214423459U (en) | Constant-variable flow converging hydraulic system for loader | |
| CN213682287U (en) | Steering hydraulic system and loader | |
| CN105805074A (en) | Three-pump confluence multi-way valve block and hydraulic excavator | |
| CN210565427U (en) | Hydraulic valve group of unmanned agricultural machine | |
| CN113431127A (en) | Main control valve, fixed variable hydraulic system and loader | |
| CN106812752B (en) | Multiple directional control valve | |
| CN210371407U (en) | Quantitative compound control hydraulic system and engineering machinery | |
| CN115489593A (en) | Steering flow control valve, hydraulic steering system and wheeled traveling apparatus | |
| CN106762903B (en) | Multiple directional control valve | |
| CN112032122B (en) | Hydraulic control system and excavator with same | |
| CN212715115U (en) | Loader hydraulic system and engineering machinery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |