CN207583718U - The outlet throttling load port separate control valves that full switch valve group is closed - Google Patents
The outlet throttling load port separate control valves that full switch valve group is closed Download PDFInfo
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- CN207583718U CN207583718U CN201721314236.8U CN201721314236U CN207583718U CN 207583718 U CN207583718 U CN 207583718U CN 201721314236 U CN201721314236 U CN 201721314236U CN 207583718 U CN207583718 U CN 207583718U
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Abstract
A kind of outlet throttling load port separate control valves for engineering machinery, using two-bit triplet reversal valve as two chamber high-low pressure oil passage change-over valve of hydraulic cylinder so that inlet and outlet can independently connect high pressure or low pressure oil way, realize energy regeneration and recycling；Ensure that flow controlling unit is always positioned at hydraulic cylinder and exports on oil circuit by three position four-way directional control valve reversal valve, actuator speed is controlled in a manner of import standard-sized sheet, outlet throttle timing, inlet throttle is eliminated and loses and reduce flow control valve quantity；Flow controlling unit is in parallel using multiple two-way switch valves, by pulse code modulation or the digital control method of Pulse number modulation, realizes flow control function.All elements of the valve are switching mode, without using any ratio control unit.The utility model can effectively reduce the development cost of load port separate control valves, further reduce valve port restriction loss.It can realize that inlet and outlet independent control, energy regeneration and recycling etc. reduce the function of system energy consumption simultaneously.
Description
Technical field
The present invention relates to hydraulic control valve, especially a kind of engineering machinery hydraulic control valve.
Background technology
Construction machinery hydraulic system controls multiple actuators by limited quantity power source, has flow and pressure requirements reality
The features such as Shi Bianhua, impedance load is with Exceed load frequent changes.Control valve is the core control member of construction machinery hydraulic system
Part.Traditional project machinery hydraulic system control valve is the multi-way valve of single spool valves, passes in and out valve port mechanical linkage, therefore hardware leads to
It is poor with property, it is handling to be difficult to be optimal with energy-saving.Load port separate control valves break the constraint of inlet and outlet mechanical couplings,
Inlet and outlet orifice size can independently be controlled, be effectively improved traditional multi-way valve there are the problem of.But existing load port is independently controlled
For valve processed using the combination of 2 3-position 4-way proportional direction valves or 4 bi-bit bi-pass proportioning valves, disengaging restriction is both needed to ratio
Valve controls, therefore there are the loss of unnecessary inlet throttle, and since ratio control unit is more, causes development cost higher,
Safety and reliability are relatively low, tend not to meet the requirement of the low cost, high reliability in industrial products.
Invention content
In order to overcome the shortcomings of the high cost of existing load port separate control valves, low reliability, the present invention provides one kind can
Effectively meet inlet and outlet independent control function, while restriction loss is few, and element cost used is low, and control is simple and safe and reliable
Construction machinery hydraulic system control valve.
The technical solution adopted by the present invention to solve the technical problems is：
The outlet throttling load port separate control valves that a kind of full switch valve group is closed, cut including rodless cavity high-low pressure oil circuit electromagnetism
Change valve 1, rod chamber high-low pressure oil passage change-over valve 2, solenoid directional control valve 3, flow controlling unit 4；The load port separate control valves P
Mouthful connection pump high pressure hydraulic fluid port, T mouthful connection fuel tanks, actuator port A and B be reversal valve actuator port a3 and b3, respectively with hydraulic cylinder
Inlet and outlet connection；The reversal valve 3 controls the direction of motion of hydraulic cylinder and stopping using 3-position 4-way direction valve；Reversal valve 3
Oil inlet p3 connected with the actuator port a1 of rodless cavity high-low pressure oil passage change-over valve 1；The oil return opening t3 and rod chamber of reversal valve 3
The actuator port a2 connections of high-low pressure oil passage change-over valve 2；Using two-bit triplet solenoid valve as high-low pressure oil passage change-over valve 1 and 2,
Two chamber of hydraulic cylinder is allowd independently to connect high pressure or low pressure oil way, realizes the energy regeneration and recycling of hydraulic cylinder；
Flow controlling unit 4 is arranged between rod chamber high-low pressure oil passage change-over valve 1 and reversal valve 3, oil inlet a4 with
The oil return opening t3 of reversal valve 3 is connected, and oil outlet b4 is connected with the actuator port a2 of switching valve 2；The stream is ensured by reversal valve 3
Control unit 4 is measured always on hydraulic cylinder outlet oil circuit, with the speed of import standard-sized sheet, outlet throttling control method control actuator
Degree reduces the quantity of flow control valve and inlet throttle loss.
Further, flow controlling unit is made of multiple unidirectional through-flow switch valves, switch valve group according to latus rectum by it is small to
It is arranged in parallel greatly, to replace proportional control valve；Control mode uses pulse code modulation（PCM）Or Pulse number modulation（PNM）
Digital control method, by controlling the action sequence of each valve port unlatching/closing, change the combination of switch valve on off operating mode, after
And adjust the output flow of flow controlling unit.
Further, the rodless cavity high-low pressure oil circuit electromagnetic switching valve 1, rod chamber high-low pressure oil passage change-over valve 2 and electricity
Magnetic reversal valve 3 is switching regulator solenoid valve, and the constituent element of the flow controlling unit is bi-bit bi-pass electromagnetic switch valve；Institute
Switch valve in flow controlling unit is stated to be mounted on a separate valves block by inserting mode, and with other reversal valves and switching
Valve is commonly mounted on by board-like mounting means on a valve block.
Beneficial effects of the present invention are mainly manifested in：
1. by reversal valve work bit map, it can effectively meet the motion control requirement under four-quadrant load behavior；Together
When, it realizes the functions such as flow regeneration, energy regenerating, reduces the energy loss of hydraulic system；
2. outlet throttling control mode causes import standard-sized sheet, the valve port pressure loss of inlet valve is reduced；Further, since only
Unilateral throttling control is needed, reduces the quantity of proportional flow control unit；
It is cost-effective and improve reliability 3. replace conventional proportional valve using multiple switch valve parallel combination.Simultaneously as
The latus rectum of each switch valve is much smaller than the latus rectum of single proportioning valve, therefore can optimal control performance, raising response speed and robust
Property.
Description of the drawings
Fig. 1 is the outlet throttling load port separate control valves schematic diagram that full switch valve group according to the present invention is closed.
Fig. 2 is the schematic diagram of flow controlling unit.
Fig. 3 is the multi executors hydraulic control system schematic diagram for embodiment.
Fig. 4 is the pulse-code-odulation of flow controlling unit and output flow figure for 5 switch valve parallel connections.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
With reference to Fig. 1, Fig. 2 and Fig. 3, a kind of outlet throttling load port separate control valves of full switch valve group conjunction, the control valve
Hydraulic actuator can be driven in four-quadrant loaded work piece.In impedance load, hydraulic cylinder is extended and retracts；In Exceed load
When, two chamber of hydraulic cylinder can connect the differential mode of low pressure oil return line simultaneously, be operated in energy recuperation mode using Exceed load
Energy is without oil pump feed；In multi executors system, underloading two chamber of hydraulic cylinder can connect pump high-pressure oil passage, be operated in flow simultaneously
Regeneration mode reduces the fuel supply flow rate of pump.The speed of hydraulic cylinder can be adjusted by flow controlling unit, using pulse code tune
System（PCM）Or pulse number modulation（PNM）Digital control method, change flow controlling unit in each switch valve unlatching
And closed state, the action sequence of regulating switch valve then adjust the total flow by flow controlling unit.
In the present embodiment, 1 dead electricity of switching valve, switching valve 2 it is electric, 3 electromagnet a of reversal valve obtains electric, and hydraulic cylinder is without bar
Chamber connection pump high pressure oil, rod chamber connection low pressure oil return line, flow control valve is between actuator port B and switching valve 2, piston
Bar stretches out, and pushes resistant load, and movement velocity is adjusted by flow controlling unit 4；
In the present embodiment, the switching valve 1 electric, 2 dead electricity of switching valve, 3 electromagnet b of reversal valve obtain electric, hydraulic cylinder is without bar
Chamber connects low pressure oil return line, and rod chamber connection pump high pressure oil, flow control valve is between actuator port A and switching valve 2, piston
It retracts, pushes resistant load, movement velocity is adjusted by flow controlling unit 4；
In the present embodiment, the 1 and 2 equal dead electricity of switching valve, 3 electromagnet a of reversal valve obtains electric, hydraulic cylinder rodless cavity and has bar
Chamber connects pump high pressure oil, and piston stretches out, and forms energy regeneration circuit, and the oil return of rod chamber flows back to rodless cavity, reduces pump again
Required flow；
In the present embodiment, the switching valve 1 and 2 it is electric, 3 electromagnet a of reversal valve obtains electric, hydraulic cylinder rodless cavity and has bar
Chamber connects low pressure oil return line, and piston stretches out back, forms energy recovery circuit, and rod chamber is flowed back in the oil return of rodless cavity again, returns
The energy of Exceed load is received, without oil pump feed；
In the present embodiment, the switching valve 1 and 2 it is electric, 3 electromagnet b of reversal valve obtains electric, hydraulic cylinder rodless cavity and has bar
Chamber connects low pressure oil return line, and piston is retracted, and forms energy recovery circuit, and rod chamber is flowed back in the oil return of rodless cavity again, is recycled
The energy of Exceed load, without oil pump feed；
In the present embodiment, the switching valve 1, switching valve 2, reversal valve 3 and the equal dead electricity of flow controlling unit, at reversal valve 3
Each switch valve is closed in middle position cut-off state, flow controlling unit, passes through the cutoff function of switch valve so that hydraulic cylinder stops
Only in required position.
With reference to Fig. 4, the control method of flow controlling unit is as follows：In the present embodiment, for the stream of 5 switch valve compositions
Control unit is measured, flow of each switch valve in rated differential head isq i（i=1,2,3,4,5）.Switch valve is received from number control
0 signal of device processed is then closed, and 1 signal received from digitial controller is then opened.The on off operating mode of switch valve is binary code
1, can realize in total 2 using 5 binary codes5The adjusting of kind control flow.Each binary code corresponds to one group of switch
Combinations of states, the control flow under the state is then to pass through the sum of flow of opening switch valve.Controller is according to target control
Valve port opening needed for flow rate calculation processed exports corresponding binary code after quantization, you can passes through outlet throttling control mode
Realize the speed control of hydraulic cylinder.
It should be noted that the resolution ratio of flow control is determined by the switch valve quantity in flow controlling unit；If it needs
The resolution ratio of flow is improved, the difference of through-current capability when can expand the quantity of paralleling switch valve, and reduce each valve standard-sized sheet.
Claims (5)
1. a kind of outlet throttling load port separate control valves that full switch valve group is closed, it is characterised in that：Including rodless cavity high-low pressure
Oil passage change-over valve, rod chamber high-low pressure oil passage change-over valve, solenoid directional control valve, flow controlling unit, the load port independent control
Valve oil inlet connection pump high pressure hydraulic fluid port, oil return opening connection fuel tank, actuator port is reversal valve actuator port；The reversal valve work
Hydraulic fluid port is connected with hydraulic cylinder inlet and outlet, and the direction of motion of hydraulic cylinder and stopping are controlled using 3-position 4-way direction valve；Reversal valve
Oil inlet connected with high-low pressure oil passage change-over valve actuator port of the oil return opening respectively with rodless cavity and rod chamber, using two three
Logical reversal valve is as high-low pressure oil passage change-over valve so that two chamber of hydraulic cylinder can independently connect high pressure or low pressure oil way, real
The energy regeneration and recycling of existing hydraulic cylinder.
2. outlet throttling load port separate control valves as described in claim 1, it is characterised in that：Flow controlling unit is arranged in
Between rod chamber high-low pressure oil passage change-over valve and reversal valve, oil inlet is connected with the oil return opening of reversal valve, and oil outlet is with cutting
The actuator port for changing valve is connected, by reversal valve ensure the flow controlling unit always in hydraulic cylinder export oil circuit on, with into
The speed of mouth standard-sized sheet, outlet throttling control method control actuator reduces the quantity of flow control valve and inlet throttle loss.
3. outlet throttling load port separate control valves as claimed in claim 1 or 2, it is characterised in that：Further, flow control
Unit is made of multiple unidirectional through-flow switch valves, and switch valve group is arranged in parallel according to latus rectum is ascending, to replace ratio control
Valve processed；Control mode uses pulse code modulation（PCM）Or Pulse number modulation（PNM）Digital control method, control each valve
The action sequence of mouth unlatching/closing, changes the combination of switch valve on off operating mode, then adjusts the output stream of flow controlling unit
Amount.
4. outlet throttling load port separate control valves as claimed in claim 1 or 2, it is characterised in that：The rodless cavity height
Pressure oil passage change-over valve, rod chamber high-low pressure oil passage change-over valve and solenoid directional control valve are switching regulator solenoid valve, the flow control
The constituent element of unit is bi-bit bi-pass electromagnetic switch valve.
5. outlet throttling load port separate control valves as claimed in claim 1 or 2, it is characterised in that：In flow controlling unit
Switch valve by inserting mode in separate valves block, and pass through board-like installation side with other reversal valves and switching valve
Formula is commonly mounted on a valve block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721314236.8U CN207583718U (en) | 2017-10-12 | 2017-10-12 | The outlet throttling load port separate control valves that full switch valve group is closed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721314236.8U CN207583718U (en) | 2017-10-12 | 2017-10-12 | The outlet throttling load port separate control valves that full switch valve group is closed |
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| CN207583718U true CN207583718U (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721314236.8U Active CN207583718U (en) | 2017-10-12 | 2017-10-12 | The outlet throttling load port separate control valves that full switch valve group is closed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111550465A (en) * | 2020-05-15 | 2020-08-18 | 北京林克富华技术开发有限公司 | Control valve group |
| CN111927843A (en) * | 2020-07-16 | 2020-11-13 | 浙江工业大学 | Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof |
-
2017
- 2017-10-12 CN CN201721314236.8U patent/CN207583718U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111550465A (en) * | 2020-05-15 | 2020-08-18 | 北京林克富华技术开发有限公司 | Control valve group |
| CN111550465B (en) * | 2020-05-15 | 2022-05-20 | 北京林克富华技术开发有限公司 | Control valve group |
| CN111927843A (en) * | 2020-07-16 | 2020-11-13 | 浙江工业大学 | Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof |
| CN111927843B (en) * | 2020-07-16 | 2024-06-11 | 浙江工业大学 | Digital fluid and continuous fluid compound control hydraulic valve unit and control method thereof |
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