CN106870496A - Novel pump truck arm support balanced valve - Google Patents
Novel pump truck arm support balanced valve Download PDFInfo
- Publication number
- CN106870496A CN106870496A CN201510927187.4A CN201510927187A CN106870496A CN 106870496 A CN106870496 A CN 106870496A CN 201510927187 A CN201510927187 A CN 201510927187A CN 106870496 A CN106870496 A CN 106870496A
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- Prior art keywords
- valve
- oil
- balanced valve
- balanced
- arm support
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Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention discloses a kind of novel pump truck arm support balanced valve, and its original sealing structure is optimized.The pressure loss is reduced when specifically pressure oil enters oil cylinder by balanced valve, in order to prevent the arm support hypervelocity under load behavior from falling during oil return, pressure oil is by balanced valve；In order to maintain oil return steady, balanced valve oil-feed, oil return main valve plug open rapid, and balancing oil valve requires that through-current capability carries out fine adjustments according to the change of load after opening；Oil cylinder piston need to be maintained at a certain position it is motionless when, balance valve core is closed, it is ensured that without leakage；All it is cone sealing, cylinder seal reliability between main valve plug and valve body, pilot valve and main valve plug；Throttling channel is two sections on main valve plug, adjusts oil return speed.
Description
Technical field
The present invention relates to a kind of novel pump truck arm support balanced valve, it is particularly suited for pumping vehicle arm rack.
Background technology
Hydraulically balanced valve is one of construction machinery hydraulic system critical elements, it is to use a kind of more pressure-control valve, it plays considerable effect to betterment works machinery performance, while also having important influence to overall engineering machine performance (stable working, reliability and system effectiveness).When band is carried and declined, if without balanced valve, mechanism will produce hypervelocity decline, the dangerous phenomenon of uncontrollable, appearance etc. to such as boom system of concrete pump truck in the presence of load.Band carries bigger, and this danger is also bigger.Equally, in All Hydraulic Travelling System (open system), the danger that can also produce hypervelocity to glide in descending, therefore be also required to use balanced valve.In order to prevent danger, realize band carry decline can control, fine motion, balance and safely, being accomplished by the installation one in the loop for declining can limit load decrease speed, can realize again fine setting and it is any it is controllable stop on a certain height in space without a multifunctional control valve for moving down (or downslide), the valve with above-mentioned functions is known as balanced valve (the also referred to as governor valve having).
Existing balanced valve mainly has two kinds of forms：Single stage type balanced valve and pilot-operated type balanced valve.Single stage type balanced valve is made up of two parts, wherein check valve（For raising operating mode）And main valve（For declining operating mode）Mutual alignment be block form, be characterized in that good stability, support are reliable, but during hydraulic system quickly commutates or hoisting system bringing onto load declines, still there is low-frequency vibration（It is commonly called as nodding）Phenomenon.Additionally, the control pressure that this class balanced valve declines process is higher, structure is more complicated.Pilot-operated type balanced valve is then sleeve type, is characterized in check valve and main valve nested, the compact conformation of implementation, and employs host-guest architecture, is that main valve plug follows pilot valve all the time.Hydraulic power thereon will not produce interference to the input signal on control piston, while also effectively reduced its control pressure, so as to improve sensitivity and the economy of balanced valve.The electric-hydraulic proportion balanced valve of Italian Bucher companies production, employs load-sensitive technology, is more advanced balanced valve in current technical field of hydraulic pressure.
The content of the invention
In order to overcome the existing pumping vehicle arm rack balanced valve response speed relatively slow and not good practical problem of sealing, the present invention has carried out the improvement in structure to pumping vehicle arm rack balanced valve, its original sealing structure is optimized simultaneously, response speed is improved on the premise of original performance is ensured, it is ensured that job security and sealing.
The technical solution adopted for the present invention to solve the technical problems is：Pressure oil reduces the pressure loss when entering oil cylinder by balanced valve, and in order to prevent the arm support hypervelocity under negative load behavior from falling during oil return, pressure oil is by balanced valve；Balanced valve oil-feed, oil return main valve plug open rapid（The main valve plug response time is no more than 1s）, balancing oil valve requires that through-current capability carries out fine adjustments according to the change of load after opening, to maintain oil return steady.When oil cylinder piston need to be maintained at a certain position it is motionless when, balance valve core is closed, to ensure without leakage.
Valve element and pilot valve are adopted as nested structure, for cone valve is sealed between main valve plug and pilot valve.Pressure oil together opens balanced valve main valve plug together with pilot valve during oil-feed, and balanced valve is equivalent to check valve, and one-way valve spring rigidity is smaller, to reduce input pressure loss.The control pressure for opening main valve plug takes from another cavity pressure of oil cylinder, and control pressure also changes therewith during load change, so that the openings of sizes of main valve plug is also matching.Throttling channel is two sections on main valve plug, to adjust oil return speed.The opening force of main valve plug is entirely power of the load effect on main valve plug active area.The hydraulic oil of oil cylinder acts on the back side of main valve plug and pilot valve when main valve plug is closed, due to being all cone sealing, cylinder seal reliability between main valve plug and valve body, pilot valve and main valve plug.
The beneficial effects of the invention are as follows：Simple in structure, manufacturability is strong, novel balance valve and is easy to dismount and safeguards；All it is cone sealing, cylinder seal reliability between main valve plug and valve body, pilot valve and main valve plug；Input pressure loss is reduced, oil-feed section through-current capability is strong, oil return section through-current capability carries out slight change with main valve plug displacement, to adjust oil return speed very well.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is Hydraulic bridge schematic diagram.
Specific embodiment
Preferably, during positive load behavior, reversal valve is in left position work, and pressure oil enters the rodless cavity of oil cylinder by balanced valve；Hydraulic oil enters balanced valve, promotes main valve plug and pilot valve compression spring to the left, so that the cone seal between main valve plug and valve body is opened, hydraulic oil enters oil cylinder by runner.
Preferably, overflow valve has been used, has prevented oil cylinder from building the pressure too high.
Preferably, cylinder rod chamber hydraulic oil is by balanced valve oil return box, rod chamber pressure oil enters balanced valve, built the pressure in runner and spring cavity, now connect the pressure oil of balanced valve, as the control oil of balanced valve, the right-hand member of control piston is acted on after the regulation of overdamp composition hydraulic half-bridge, promote pilot valve to be moved to the left.
Preferably, the tapered sealing between pilot valve and main valve plug is opened, and by the passage pressure release between pilot valve and main valve plug, due to damping hole effect, runner forms certain pressure difference to spring cavity mesohigh oil with spring cavity.
Preferably, runner high pressure is acted on main valve plug annulus area, produces the power of orientation, spring cavity low pressure to act on main valve plug left side annulus area and produce opposition.
Preferably, hydraulic cavities reach to a certain degree with spring cavity pressure difference, and main valve plug is opened, and hydraulic oil completes oil return by the throttling channel stream of special construction on main valve plug.
Preferably, when bearing load behavior, reversal valve is in right position work, and two balanced valve working conditions are opposite.
Preferably, it is tapered seal form between main valve plug and valve body, pilot valve and main valve plug, hydraulic oil cannot be released, and rodless cavity builds the pressure higher, and balanced valve sealing is more reliable, to prevent arm support when static because gravity voluntarily falls.
Preferably, such as Fig. 1, in constant pressure source fuel feeding P0It is constant and return pressure PRIt is constant（Generally make 0）Under conditions of, two liquid resistance of liquid bridge（Control valve port）One oil-discharging cavity of control（That is a control chamber of hydraulic cylinder）, y is outer increase control signal, and the double-lined arrow according to direction as shown represents R1, R4Valve port opening increase and liquid resistance reduces, single lined arrows represent R2, R3Aperture reduce and liquid resistance increase, bear cover four side spool control valves be the variable hydraulic full-bridge of four arms.
Claims (5)
1. novel pump truck arm support balanced valve, optimizes to its original sealing structure, it is characterized in that：Balanced valve working method is changed according to operating mode situation；Pressure oil reduces the pressure loss when entering oil cylinder by balanced valve, balanced valve oil-feed, oil return main valve plug open rapid, and balance valve core leakage is little, and valve element and pilot valve are adopted as nested structure, for cone valve is sealed between main valve plug and pilot valve, cylinder seal reliability.
2. novel pump truck arm support balanced valve according to claim 1, it is characterized in that：Pressure oil reduces the pressure loss when entering oil cylinder by balanced valve, and in order to prevent the arm support hypervelocity under negative load behavior from falling during oil return, pressure oil is by balanced valve.
3. novel pump truck arm support balanced valve according to claim 1, it is characterized in that：In order to maintain oil return steady, balanced valve oil-feed, oil return main valve plug open rapid, and balancing oil valve requires that through-current capability carries out fine adjustments according to the change of load after opening.
4. novel pump truck arm support balanced valve according to claim 1, it is characterized in that：To ensure without leakage, when oil cylinder piston need to be maintained at a certain position it is motionless when, balance valve core is closed.
5. novel pump truck arm support balanced valve according to claim 1, it is characterized in that：All it is cone sealing to ensure cylinder seal reliability, between main valve plug and valve body, pilot valve and main valve plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510927187.4A CN106870496A (en) | 2015-12-14 | 2015-12-14 | Novel pump truck arm support balanced valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510927187.4A CN106870496A (en) | 2015-12-14 | 2015-12-14 | Novel pump truck arm support balanced valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106870496A true CN106870496A (en) | 2017-06-20 |
Family
ID=59177760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510927187.4A Pending CN106870496A (en) | 2015-12-14 | 2015-12-14 | Novel pump truck arm support balanced valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106870496A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338173A (en) * | 2021-07-27 | 2021-09-03 | 董玉凯 | Support arrangement for bridge construction |
-
2015
- 2015-12-14 CN CN201510927187.4A patent/CN106870496A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338173A (en) * | 2021-07-27 | 2021-09-03 | 董玉凯 | Support arrangement for bridge construction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170620 |
|
| WD01 | Invention patent application deemed withdrawn after publication |