CN208293648U - Automatically controlled positive-flow hydraulic system - Google Patents
Automatically controlled positive-flow hydraulic system Download PDFInfo
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- CN208293648U CN208293648U CN201820622349.2U CN201820622349U CN208293648U CN 208293648 U CN208293648 U CN 208293648U CN 201820622349 U CN201820622349 U CN 201820622349U CN 208293648 U CN208293648 U CN 208293648U
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Abstract
The utility model discloses a kind of automatically controlled positive-flow hydraulic systems, belong to hydraulic system field.It includes positive flow pump assembly, solenoid valve block, positive flow main control valve, executing agency, electromagnetic proportional valve, manipulation device and control unit ECU, positive flow pump assembly includes two plunger pumps and a gear pump, two outlet of plunger pump P1 and P2 are connect with positive flow main control valve respectively, positive flow main control valve actuator port connects executing agency, the corresponding solenoid valve block of at least two groups is provided on positive flow main control valve, solenoid valve block includes more than one electromagnetism valve block, solenoid valve is installed in electromagnetism valve block, two plunger pumps are connected separately with proportion magnetic valve, control unit ECU respectively with electromagnetism valve block, electromagnetic proportional valve, manipulation device electrical connection.The utility model is used for engineering machinery, is a kind of intelligent, energy saving, comfortable, reliable engineering machinery hydraulic control system.
Description
Technical field
The utility model belongs to a kind of hydraulic system, specifically, more particularly to a kind of automatically controlled positive-flow hydraulic system.
Background technique
Excavator, also known as excavating machinery are to be excavated to be higher or lower than the material for holding machine side with scraper bowl, and be packed into haulage vehicle
Or it unloads to the earthmoving machinery of windrow factory.From the point of view of the development of engineering machinery in recent years, the development of excavator is relatively fast, excavator
Have become one of most important engineering machinery in engineering construction.In medium-and-large-sized excavator, 70% or more type is positive stream
Amount system excavator and minus flow system excavator.Wherein, for positive-flow hydraulic system compared to for minus flow, control signal is direct
It is acted on valve and pump simultaneously, acts valve with pump and carry out simultaneously, thus it is handling good.And the center of positive flow system master valve
Oil return circuit only has system back pressure, and minus flow system has the back pressure of 3MPa or so, therefore positive flow system is with respect to minus flow
System, can be more energy saving.
In traditional positive flow system, the control signal of positive flow comes from guide's secondary pressure, and principle is by a series of
Shuttle valve or pressure sensor select highest secondary pressure signal go control main pump stroking mechanism.When handle displacement increases,
Secondary pilot pressure increases, and higher pressure signal acts on the regulating mechanism of pump, makes to pump swash plate angle increase, discharge capacity increases
Greatly；Conversely, secondary pilot pressure becomes smaller when handle displacement becomes smaller, the discharge capacity of pump becomes smaller, to meet flow and the execution of pump
Demand of the mechanism to flow matches.
It is intelligent, energy saving, comfortable, reliable, it is always the development trend of excavator hydraulic system.With China's base in recent years
The continuous development built, it is intelligent, further development will be obtained.Immediately following the trend of international hydraulic system intelligent development, knot
The practical complete machine hydraulic system situation of my company is closed, proposes the utility model.
Utility model content
The utility model aim is to provide a kind of intelligent, energy saving, comfortable, reliable automatically controlled positive-flow hydraulic system, with
Overcome defect existing for positive-flow hydraulic system traditional in the prior art.
The utility model adopts the following technical solutions realization:
Automatically controlled positive-flow hydraulic system described in the utility model, including positive flow pump assembly, solenoid valve block, positive flow master
Valve, executing agency, electromagnetic proportional valve, manipulation device and control unit ECU are controlled, the positive flow pump assembly includes two plunger pumps
With a gear pump, two outlet of plunger pump P1 and P2 are connect with positive flow main control valve respectively, the positive flow main control valve work
Hydraulic fluid port connects executing agency, is provided with the corresponding solenoid valve block of at least two groups, the solenoid valve block on the positive flow main control valve
Including more than one electromagnetism valve block, solenoid valve is installed in electromagnetism valve block, is equipped with inside the electromagnetism valve block and to be connected with T mouthfuls
Back oil road, to the C mouth of Pp mouthfuls of connected oil input channels and corresponding related positive flow main control valve pilot port, the gear pump outlet P3 and
Pp mouthfuls of connections, two plunger pumps are connected separately with electromagnetic proportional valve, described control unit ECU respectively with electromagnetism valve block, electromagnetism ratio
Example valve, manipulation device electrical connection.
The gear pump outlet P3 is connected to by pressure cut off electromagnetic switch valve with Pp mouthfuls, the pressure cut off electromagnetic switch
Valve is electrically connected with control unit ECU.
The executing agency includes bucket cylinder, boom cylinder, running motor A, running motor B, rotary motor, dipper oil
Cylinder.
The manipulation device includes left operation handle, right operation handle, left threading valve, right threading valve.
Compared with prior art, the utility model has the beneficial effects that
1) reduce labor intensity: electric hand handle steering force is greatly reduced compared with pilot handle, effectively reduces labor intensity；
2) intelligent: the application of a whole set of solenoid valve in the utility model, so that the output of complete machine hydraulic system is faster, more
It is quasi-；
3) reduce main control valve R&D cycle and research and development cost: in the utility model, the application of electromagnetic proportional valve passes through a system
The logical relation of column, so that it may which when controlling composite move, the dominance relation respectively acted saves the various pressure-gradient control valves in traditional main control valve
Plug-in unit, in addition, the application of solenoid valve, so that the debugging cycle of area performance shortens dramatically；
4) reduce risks and assumptions: in traditional main control valve, realization and the utility model identical function need more installations are several to insert
Part, the utility model no longer needs these plug-in units, thus related plug-in unit gives master control valve performance bring risks and assumptions, such as because of valve
The internal remaining bulky grain in portion and caused by package card valve the problems such as also eliminate the need for；
5) reduce production cost: with the continuous development of electronic control technology, related elements cost is constantly reduced, in addition, this reality
It is significantly reduced with the novel pipeline made in complete machine hydraulic system, so that complete system plant's cost further decreases；
6) market service after convenience: the utility model is further simplified complete machine hydraulic system, and rear market goes wrong
When, the factor that attendant needs to check is reduced, therefore rear market service is more convenient.
Detailed description of the invention
Fig. 1 is the hydraulic schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram that the positive flow main control valve of solenoid valve block is installed in the utility model；
Fig. 3 is the partial sectional view that solenoid valve block is connect with positive flow main control valve in the utility model；
Fig. 4 is the cross-sectional view of solenoid valve block in the utility model；
Fig. 5 is the logical relation schematic diagram in the utility model between C mouthfuls of output pressure Px and handle angle a；
In figure: 1, positive flow pump assembly；2, pressure cut off electromagnetic switch valve；3, solenoid valve block；4, positive flow main control valve；5,
Bucket cylinder；6, boom cylinder；7, running motor A；8, running motor B；9, rotary motor；10, bucket arm cylinder；11, electromagnetism ratio
Example valve；12, left operation handle；13, right operation handle；14, left threading valve；15, right threading valve；16, control unit ECU；17, electric
Magnet valve；18, electromagnetism valve block；19, valve rod；20, spring；21, back oil road；22, oil input channel.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, the automatically controlled positive-flow hydraulic system of the utility model, including positive flow pump assembly 1, pressure cut off electromagnetism
Switch valve 2, solenoid valve block 3, positive flow main control valve 4, executing agency, electromagnetic proportional valve 11, manipulation device and control unit
ECU16。
Positive flow pump assembly 1 includes two plunger pumps and a gear pump, and two outlet of plunger pump P1 and P2 are respectively and just
Flow main control valve 4 connects, and plunger pumpage is adjustable, and gear pump outlet P3, discharge capacity is non-adjustable, and gear pump is mainly used to provide first
Oil Guide, pressure cut off electromagnetic switch valve 2 have been safeguard protection effects, and Pp mouthfuls of pressure oils are mentioned by pressure cutoff switch solenoid valve 2
For being powered, then Pp mouthfuls of pilot pressures are connected with P3 mouthfuls of pressure, are high pressure；Power-off, then Pp mouthfuls of pilot pressures do not connect with P3 mouthfuls of pressure
It is logical, it is low pressure.
As shown in Figure 2, Figure 3, Figure 4, positive flow main control valve 4 is provided with 4 solenoid valve blocks 3 in the utility model embodiment,
4 left valve barrel of positive flow main control valve and right valve barrel respectively correspond setting 2, and solenoid valve block 3 includes more than one electromagnetism valve block 18,
Solenoid valve 17 is installed, electromagnetism valve block 18 is bolted on 4 valve body of positive flow main control valve, solenoid valve in electromagnetism valve block 18
It is equipped with inside block 18 first to T mouthfuls of connected back oil roads 21, positive flow main control valve 4 related with oil input channel 22 and correspondence that Pp mouthfuls are connected
The C mouth of mouth is led, the oil liquid of 21 the inside of back oil road is low pressure oil liquid, after the energization of pressure cut off electromagnetic switch valve 2, in oil input channel 22
The oil liquid in face is high-voltage oil liquid, the C mouthfuls of outlets for solenoid valve 17.
C mouthfuls of the outlet of solenoid valve 17 is connected with the pilot port of 4 valve rod 19 of positive flow main control valve, when oil liquid is high pressure oil,
High pressure oil directly acts on 19 end face of valve rod, and hydraulic coupling overcomes 20 elastic force of spring on valve rod 19, and valve rod 19 is pushed to act, from
And realize corresponding actions.Discharge capacity of the positive flow main control valve 4 not directly to plunger pump feedback pressure signal and pilot plunger pump, plunger
The discharge capacity of pump is adjusted, and is all controlled by power regulation with electromagnetic proportional valve 11 by control unit ECU16.
Two plunger pumps are connected separately with a power regulation electromagnetic proportional valve 11, according to operating condition driver operation adjustable column
Fill in the output power of pump；Electromagnetic proportional valve 11 powers off, and the plunger pump swash plate angle that electromagnetic proportional valve 11 is controlled is maximum, and discharge capacity is most
Greatly；Electromagnetic proportional valve 11 is powered, so that the swash plate angle of plunger pump becomes smaller, discharge capacity reduces.Two electromagnetic proportional valves 11 pass through control
The logical relation of unit ECU16 processed, had not only been able to satisfy the work requirements of complete machine, but also made the absorption maximum power of two plunger pumps not
Cause to suppress vehicle as the output power for being greater than engine.
Manipulation device includes left operation handle 12, right operation handle 13, left threading valve 14, right threading valve 15, left manipulator
Handle 12 and right operation handle 13 are electric hand handle, and left threading valve 14 and right threading valve 15 are electric foot valve, and four be all by operator
Input angle, outputs current to control unit ECU16, and control unit ECU16 retransmits current-order to corresponding solenoid valve 17, makes
Solenoid valve 17 exports different pressures oil, and acting on 4 valve rod 19 of positive flow main control valve makes the movement of valve rod 19, to keep complete machine dynamic
Make.
4 actuator port of positive flow main control valve connects executing agency, and executing agency includes bucket cylinder 5, boom cylinder 6, row
Walk motor A7, running motor B8, rotary motor 9, bucket arm cylinder 10, bucket cylinder 5, boom cylinder 6, running motor A7, walking
The movement of motor B8, rotary motor 9, bucket arm cylinder 10 pass through corresponding solenoid valve 17 respectively and control.
For example, handle receives the angle that operator gives, passes through in use, operator wants that scraper bowl is allowed to realize excavation movement
The signals such as voltage, electric current pass to control unit ECU16, and control unit ECU16 handles the signal received, output phase
Electric current is answered, electromagnetic proportional valve 11 is inputted according to obtained different size of electric current, the C mouthfuls of exportable differences no more than Pp pressure
Output pressure Px, Px and electric handle angle a relationship it is as shown in Figure 5.Guide's oil liquid with pressure acts on positive flow main control valve 4
On 19 end face of valve rod, and push valve rod 19 that 20 elastic force of spring is overcome to move to right, 4 actuator port output pressure of positive flow main control valve to shovel
Struggle against oil cylinder 5, makes dipper motion.After handle resets, the input current of electromagnetic proportional valve 11 is zero, the delivery outlet of corresponding solenoid valve 17
C mouthfuls of output pressure is zero, and position in the recovery of valve rod 19,4 actuator port pressure output of positive flow main control valve is interrupted.
Claims (4)
1. a kind of automatically controlled positive-flow hydraulic system, it is characterised in that: including positive flow pump assembly (1), solenoid valve block (3), positive stream
It is total to measure main control valve (4), executing agency, electromagnetic proportional valve (11), manipulation device and control unit ECU (16), the positive flow pump
It include two plunger pumps and a gear pump at (1), two outlet of plunger pump P1 and P2 connect with positive flow main control valve (4) respectively
It connects, positive flow main control valve (4) actuator port connects executing agency, is provided at least two on the positive flow main control valve (4)
The corresponding solenoid valve block of group, the solenoid valve block (3) includes more than one electromagnetism valve block (18), and electromagnetism valve block is installed on (18)
Have solenoid valve (17), to be equipped with inside the electromagnetism valve block (18) with T mouthfuls the back oil road being connected (21), the oil input channel that is connected with Pp mouthfuls
(22) and the C mouth of corresponding related positive flow main control valve (4) pilot port, the gear pump outlet P3 are connected to Pp mouthfuls, two plungers
Pump be connected separately with electromagnetic proportional valve (11), described control unit ECU (16) respectively with electromagnetism valve block (18), electromagnetic proportional valve
(11), manipulation device is electrically connected.
2. automatically controlled positive-flow hydraulic system according to claim 1, it is characterised in that: the gear pump outlet P3 passes through pressure
Power cutting electromagnetic switch valve (2) is connected to Pp mouthfuls, and the pressure cut off electromagnetic switch valve (2) is electrically connected with control unit ECU (16)
It connects.
3. automatically controlled positive-flow hydraulic system according to claim 1 or 2, it is characterised in that: the executing agency includes shovel
Bucket oil cylinder (5), boom cylinder (6), running motor A (7), running motor B (8), rotary motor (9), bucket arm cylinder (10).
4. automatically controlled positive-flow hydraulic system according to claim 3, it is characterised in that: the manipulation device includes left operation
Handle (12), right operation handle (13), left threading valve (14), right threading valve (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820622349.2U CN208293648U (en) | 2018-04-27 | 2018-04-27 | Automatically controlled positive-flow hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820622349.2U CN208293648U (en) | 2018-04-27 | 2018-04-27 | Automatically controlled positive-flow hydraulic system |
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| Publication Number | Publication Date |
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| CN208293648U true CN208293648U (en) | 2018-12-28 |
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ID=64703810
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| CN201820622349.2U Active CN208293648U (en) | 2018-04-27 | 2018-04-27 | Automatically controlled positive-flow hydraulic system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108385767A (en) * | 2018-04-27 | 2018-08-10 | 山东临工工程机械有限公司 | Automatically controlled positive-flow hydraulic system |
| CN113969603A (en) * | 2021-11-29 | 2022-01-25 | 山河智能装备股份有限公司 | Excavator and liquid drive electric control system thereof |
-
2018
- 2018-04-27 CN CN201820622349.2U patent/CN208293648U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108385767A (en) * | 2018-04-27 | 2018-08-10 | 山东临工工程机械有限公司 | Automatically controlled positive-flow hydraulic system |
| CN113969603A (en) * | 2021-11-29 | 2022-01-25 | 山河智能装备股份有限公司 | Excavator and liquid drive electric control system thereof |
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