CN104986675B - A kind of luffing range of cantilever support hydraulic system and crane - Google Patents
A kind of luffing range of cantilever support hydraulic system and crane Download PDFInfo
- Publication number
- CN104986675B CN104986675B CN201510391773.1A CN201510391773A CN104986675B CN 104986675 B CN104986675 B CN 104986675B CN 201510391773 A CN201510391773 A CN 201510391773A CN 104986675 B CN104986675 B CN 104986675B
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- Prior art keywords
- valve
- oil circuit
- oil
- pressure
- chamber
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/82—Luffing gear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- 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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
Abstract
The invention discloses a kind of luffing range of cantilever support hydraulic system, including main pump, main valve, amplitude oil cylinder, the first oil circuit, the second oil circuit, first oil circuit is connected with the first chamber hydraulic fluid port of amplitude oil cylinder, second oil circuit is connected with the second chamber hydraulic fluid port of amplitude oil cylinder, first oil circuit is connected with the first actuator port of main valve, second oil circuit is connected with the second actuator port of main valve, and main pump is connected with the oil inlet of main valve, and pressure-control valve is provided with the first oil circuit.Also include servopump and servo oil circuit, servopump is connected to servo oil circuit fuel feeding, servo oil circuit with guide's hydraulic fluid port of pressure-control valve, hydraulic valve is provided with servo oil circuit, hydraulic valve control pressure controls the aperture of valve.The present invention solves conventional balanced valve, and frequently the caused arm support of opening and closing is rocked, and improves luffing range of cantilever support manipulation stationarity and fine motion.
Description
Technical field
The present invention relates to engineering machinery field, more particularly to a kind of luffing range of cantilever support hydraulic system and crane.
Background technology
In the luffing range of cantilever support operation of engineering machinery, such as in autocrane, executing agency is usually amplitude oil cylinder,
In the arm operation that fall, the general balanced valve installed using the big chamber of hydraulic pressure closed-loop control, i.e. amplitude oil cylinder of arm support decentralization is opened
Oil sources comes chamber from childhood.But in actual applications, it can be seen that because the difference and arm support angle of load are different, in arm support decentralization process
In often occur that arm support is fiercely rocked, fine motion difference the problems such as.To find out its cause, opening oil sources due to balanced valve comes chamber from childhood,
In decentralization process, main pump output flow to the small chamber of amplitude oil cylinder and balanced valve elder generation guide cavity, with small cavity pressure raise, balanced valve
Aperture increases, and then arm support lowering velocity is accelerated, and accelerates however as arm support lowering velocity, and small cavity pressure is being reduced again, balance
Valve opening and then reduction, amplitude oil cylinder speed slow down, therefore in whole arm support decentralization process, constantly repeat balanced valve opening and closing
Process, and then cause arm support to rock, and main pump changes in flow rate mode is difficult to meet all operating modes, therefore it is flat to have a strong impact on manipulation
Stability and fine motion.
The content of the invention
In view of this, the present invention proposes a kind of luffing range of cantilever support hydraulic system and crane, to solve in arm support decentralization process
In often occur that arm support is fiercely rocked, have a strong impact on manipulation stationarity and fine motion problem.
On the one hand, the invention provides a kind of luffing range of cantilever support hydraulic system, including main pump, main valve, amplitude oil cylinder, the first oil
Road, the second oil circuit, the first oil circuit are connected with the first chamber hydraulic fluid port of amplitude oil cylinder, the second chamber hydraulic fluid port of the second oil circuit and amplitude oil cylinder
Connection, the first oil circuit is connected with the first actuator port of main valve, and the second oil circuit is connected with the second actuator port of main valve, main
Pump is connected with the oil inlet of main valve, and pressure-control valve is provided with the first oil circuit, also including servopump and servo oil circuit, watches
Pump is taken to servo oil circuit fuel feeding, servo oil circuit is connected with guide's hydraulic fluid port of pressure-control valve, and liquid is provided with servo oil circuit
Pressure valve, hydraulic valve control pressure controls the aperture of valve.
Further, in order to prevent the chamber of amplitude oil cylinder second, below the arm support during be emptied, including controller and pressure
Sensor, pressure sensor is arranged on amplitude oil cylinder or the second oil circuit, and pressure sensor detects the second chamber of amplitude oil cylinder
Hydraulic fluid port pressure, controller obtains pressure sensor signal, controls discharge of main pump.
Further, if the second chamber of pressure sensor detection hydraulic fluid port pressure is less than setting value, controller increases main pump row
Amount, if the second chamber of pressure sensor detection hydraulic fluid port pressure is more than setting value, controller reduces discharge of main pump.
Further, in arm support decentralization process, the first oil circuit is oil return circuit, and the second oil circuit is oil-feed oil circuit；In arm
During frame is lifted upwards, the first oil circuit is oil-feed oil circuit, and the second oil circuit is oil return circuit.
Further, pressure-control valve is balanced valve, and guide's hydraulic fluid port of balanced valve is connected with servo oil circuit, balanced valve
Oil inlet and outlet is connected with the first oil circuit.
Further, hydraulic valve is electric proportional pressure-reducing valve or electric proportional pressure control valve or proportional reversing valve, and hydraulic valve is adjusted
Save guide's hydraulic fluid port pressure of pressure-control valve.
Further, main valve is three position four-way directional control valve, and three position four-way directional control valve middle position function is Y types.
Further, including fuel tank, fuel tank is connected with the oil return opening of main valve, and the second chamber of amplitude oil cylinder is rod chamber,
First chamber of amplitude oil cylinder is rodless cavity.
In addition, present invention also offers a kind of crane, including above-mentioned luffing range of cantilever support hydraulic system.
Further, including body and arm support, arm support is hinged with body, and cylinder barrel and the body of amplitude oil cylinder are hinged, luffing
The piston rod of oil cylinder is hinged with arm support.
The present invention proposes a kind of luffing range of cantilever support hydraulic system and crane, solves and often occur in arm support decentralization process
Arm support is fiercely rocked, and has a strong impact on the problem of manipulation stationarity and fine motion.First pass around analysis and experiment repeatedly and have found arm
The reason for frame is fiercely rocked, and propose to solve the fierce technical scheme rocked of arm support.Solution of the invention is：By servo
Hydraulic valve control pressure in oil circuit controls the openings of sizes of valve.Hydraulic valve can be electric proportional pressure-reducing valve or electric proportional overflow
Valve or proportional reversing valve etc., pressure-control valve can be pilot operated compound relief valve, balanced valve, one way sequence valve, pressure-reducing valve equipressure
Force control valve.Guide's hydraulic fluid port pressure of hydraulic pressure valve regulation pressure-control valve.So as to controlling amplitude oil cylinder oil return speed, it is to avoid with
Arm support is rocked caused by toward balanced valve frequently opening and closing, improves luffing range of cantilever support manipulation stationarity and fine motion.
In addition, pressure-control valve can also be arranged in the first oil circuit and the second oil circuit simultaneously.Each pressure-control valve
Using guide's hydraulic fluid port pressure of the hydraulic pressure valve regulation pressure-control valve in a servo oil circuit.
In further technical scheme, in order to prevent the chamber of amplitude oil cylinder second, below the arm support during be emptied.By pressure
Force snesor detects the cavity pressure of amplitude oil cylinder second, real-time regulation main pump output flow, it is ensured that amplitude oil cylinder is in friction speed arm
In frame decentralization process, the second cavity pressure stabilization is not emptied.
Luffing range of cantilever support hydraulic system of the invention can apply to crane, it is also possible to be applied in other machinery, for example：
In the equipment such as concrete mixer, ladder truck, fire fighting truck.
Brief description of the drawings
The accompanying drawing for constituting a part of the invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate, for explaining the present invention, not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is luffing range of cantilever support Hydraulic System Principle schematic diagram of the present invention.
Specific embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
With reference to Fig. 1, the preferred embodiments of the present invention are described in further detail, the arm support of this preferred embodiment becomes
Width hydraulic system, one is to solve often to occur that arm support is fiercely rocked in arm support decentralization process, having a strong impact on manipulation flat
Stability and the problem of fine motion.
As shown in figure 1, luffing range of cantilever support hydraulic system is specifically included：Main pump 5, main valve 4, amplitude oil cylinder 1, fuel tank, the first oil
Road, the second oil circuit, the first oil circuit are connected with the first chamber hydraulic fluid port of amplitude oil cylinder 1, and the second oil circuit is oily with the second chamber of amplitude oil cylinder 1
Mouthful connection, the first oil circuit is connected with the first actuator port B of main valve 4, the second actuator port A phases of the second oil circuit and main valve 4
Connection, main pump 5 is connected with the oil inlet P of main valve 4, and fuel tank is connected with the oil return inlet T of main valve 4, is set in the first oil circuit
There is pressure-control valve 2, pressure-control valve 2 oil inlet and outlet A, B are connected with the first oil circuit.The main pump 5, main valve in the hydraulic system
4th, amplitude oil cylinder 1, fuel tank, the first oil circuit, the second oil circuit constitute open type hydraulic system.The hydraulic pressure of the expanding-contracting action of amplitude oil cylinder 1
Hydraulic oil of the source from main pump 5.
In the present embodiment, the second chamber of amplitude oil cylinder 1 is rod chamber, and the first chamber of amplitude oil cylinder 1 is rodless cavity.There is bar
Chamber refers to the chamber for having piston rod, and rodless cavity refers to the chamber of piston-rodless.Due to the small also referred to as small chamber of rod chamber volume, due to rodless cavity
Volume is also referred to as greatly big chamber.
When main valve 4 is in right position, the first oil circuit is oil return circuit, and the second oil circuit is oil-feed oil circuit, and the hydraulic oil of main pump 5 is passed through
Cross main valve 4, the second oil circuit to enter in the second chamber, the hydraulic oil in the chamber of amplitude oil cylinder 1 first passes through the first oil circuit, pressure-control valve
2nd, the oil return box of main valve 4, now arm support transferred in the presence of deadweight.The openings of sizes of valve 2 can be controlled by control pressure,
Control the return oil pressure of the first oil circuit.
When main valve 4 is in left position, the first oil circuit is oil-feed oil circuit, and the second oil circuit is oil return circuit.The hydraulic oil of main pump 5
Enter in the first chamber by main valve 4, pressure-control valve 2, the first oil circuit, the hydraulic oil in the chamber of amplitude oil cylinder 1 second passes through second
Oil circuit, the oil return box of main valve 4, now arm support lift upwards, pressure-control valve 2 be in one-way conduction state.
Pressure-control valve of the invention 2 is balanced valve, or pilot operated compound relief valve, one way sequence valve, pressure-reducing valve etc.
Pressure-control valve.Pressure-control valve 2 is the valve general name for controlling inlet and outlet pressure.
In prior art amplitude oil cylinder hydraulic system, the pressure oil of guide's hydraulic fluid port X of balanced valve comes from the second oil circuit, the
Pressure in two oil circuits changes and changes with arm support lowering velocity, and frequently the caused arm support of opening and closing is rocked to cause balanced valve.In order to
Solution often occurs that arm support is fiercely rocked in arm support decentralization process, has a strong impact on the problem of manipulation stationarity and fine motion.
The present invention is using the outside oil circuit control pressure control openings of sizes of valve 2.As shown in figure 1, including servopump (not shown) and
Servo oil circuit, servopump is connected to servo oil circuit fuel feeding, servo oil circuit with guide's hydraulic fluid port X of pressure-control valve 2, in servo oil
Hydraulic valve 3 is provided with road, the control pressure of hydraulic valve 3 controls the aperture of valve 2.Hydraulic valve 3 can for electric proportional pressure-reducing valve or
Electric proportional pressure control valve or proportional reversing valve, hydraulic valve 3 adjust guide's hydraulic fluid port X pressure of pressure-control valve 2.Hydraulic valve 3 enters
Oil-out is connected with P, A servo oil circuit, and the oil return inlet T of hydraulic valve 3 is connected with fuel tank.
In decentralization process, during being also referred to as arm, the arm support arm speed that falls is determined arm support by luffing electric control handle, with
The increase of luffing electric control handle aperture, the electric current increase of hydraulic valve 3, output pressure increase, and then the aperture of pressure-control valve 2 to increase
Greatly, promoting the chamber return flow of amplitude oil cylinder 1 first increases, and arm support lowering velocity is accelerated.If luffing electric control handle aperture is reduced,
The electric current of hydraulic valve 3 is reduced, and the aperture of pressure-control valve 2 is reduced, and promotes the chamber return flow of amplitude oil cylinder 1 first to reduce, arm support
Lowering velocity slows down.Therefore, the lowering velocity of arm support determines by luffing electric control handle completely, the size of current of hydraulic valve 3.
Arm support is in decentralization process, if arm support lowering velocity is too fast, the chamber of amplitude oil cylinder 1 second can be caused to be emptied, due to
Pressure-control valve 2 comes from hydraulic valve 3, the deadweight of whole process arm rest frame using the unlatching oil sources of hydraulic pressure opened loop control, i.e. balanced valve
Realize that amplitude oil cylinder 1 is transferred.Now, the small chamber of amplitude oil cylinder 1 only needs the repairing of main pump 5 to ensure not to be emptied, and the oil return in big chamber
Speed (arm support lowering velocity) depends entirely on the aperture of balanced valve.Balanced valve plays a part of dead lock for safety and throttle grverning,
Avoid the problem that traditional control method balanced valve is frequently opened and closed.
In order to solve the problems, such as that the chamber of amplitude oil cylinder 1 second is emptied, present invention additionally comprises controller and pressure sensor 6, pressure
Force snesor 6 is arranged in amplitude oil cylinder 1, it is also possible on the second oil circuit.The detection amplitude oil cylinder 1 of pressure sensor 6
Small chamber hydraulic fluid port pressure, controller obtains the signal of pressure sensor 6, controls the discharge capacity of main pump 5.If the detection of pressure sensor 6 second
Chamber hydraulic fluid port pressure is less than setting value, that is to say, that arm support lowering velocity is too fast, and the second chamber may be emptied, and controller is to main pump 5
The discharge capacity instruction of increase main pump 5 is sent, increases the discharge capacity of main pump 5.If second chamber of the detection of pressure sensor 6 hydraulic fluid port pressure is more than set
Definite value, controller sends reduction main pump 5 discharge capacity and instructs to main pump 5, reduces the discharge capacity of main pump 5.
Present invention also offers a kind of crane：Including body and arm support and above-mentioned luffing range of cantilever support hydraulic system, arm support
It is hinged with body, cylinder barrel and the body of amplitude oil cylinder 1 are hinged, piston rod and the arm support of amplitude oil cylinder 1 are hinged.
Luffing range of cantilever support hydraulic system of the invention can also be applied in other machinery, for example：Concrete mixer, ascend a height
In the equipment such as car, fire fighting truck.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (7)
1. a kind of luffing range of cantilever support hydraulic system, including main pump (5), main valve (4), amplitude oil cylinder (1), the first oil circuit, the second oil circuit,
Controller and pressure sensor (6), the first oil circuit are connected with the first chamber hydraulic fluid port of amplitude oil cylinder (1), and the second oil circuit is oily with luffing
Second chamber hydraulic fluid port connection of cylinder (1), the first oil circuit is connected with the first actuator port of main valve (4), the second oil circuit and main valve (4)
The second actuator port be connected, main pump (5) is connected with the oil inlet of main valve (4), and pressure control is provided with the first oil circuit
Valve (2) processed, it is characterised in that also including servopump and servo oil circuit, servopump is to servo oil circuit fuel feeding, servo oil circuit and pressure
Guide's hydraulic fluid port of control valve (2) is connected, and hydraulic valve (3), hydraulic valve (3) control pressure control valve are provided with servo oil circuit
(2) aperture；
In amplitude oil cylinder (1) or the second oil circuit, pressure sensor (6) detects amplitude oil cylinder (1) to pressure sensor (6)
The second chamber hydraulic fluid port pressure, controller obtain pressure sensor (6) signal, control main pump (5) discharge capacity；
Pressure-control valve (2) is balanced valve, and guide's hydraulic fluid port of balanced valve is connected with servo oil circuit, the oil inlet and outlet of balanced valve with
First oil circuit is connected；
Hydraulic valve (3) is electric proportional pressure-reducing valve or electric proportional pressure control valve or proportional reversing valve, hydraulic valve (3) regulation pressure control
Guide's hydraulic fluid port pressure of valve (2) processed.
2. luffing range of cantilever support hydraulic system according to claim 1, it is characterised in that if pressure sensor (6) detection the
Two chamber hydraulic fluid port pressure are less than setting value, and controller increases main pump (5) discharge capacity, if pressure sensor (6) detects the second chamber hydraulic fluid port
Pressure is more than setting value, and controller reduces main pump (5) discharge capacity.
3. luffing range of cantilever support hydraulic system according to claim 2, it is characterised in that in arm support decentralization process, the first oil
Road is oil return circuit, and the second oil circuit is oil-feed oil circuit；During arm support is lifted upwards, the first oil circuit is oil-feed oil circuit, second
Oil circuit is oil return circuit.
4. the luffing range of cantilever support hydraulic system according to claims 1 to 3 any one, it is characterised in that main valve (4) is three
Four-way reversing valve, three position four-way directional control valve middle position function is Y types.
5. the luffing range of cantilever support hydraulic system according to claims 1 to 3 any one, it is characterised in that including fuel tank, fuel tank
Oil return opening with main valve (4) is connected, and the second chamber of amplitude oil cylinder (1) is rod chamber, and the first chamber of amplitude oil cylinder (1) is without bar
Chamber.
6. a kind of crane, it is characterised in that including the luffing range of cantilever support hydraulic system as described in claim 1 to 5 any one.
7. crane according to claim 6, it is characterised in that including body and arm support, arm support is hinged with body, luffing
The cylinder barrel of oil cylinder (1) is hinged with body, and the piston rod of amplitude oil cylinder (1) is hinged with arm support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510391773.1A CN104986675B (en) | 2015-07-02 | 2015-07-02 | A kind of luffing range of cantilever support hydraulic system and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510391773.1A CN104986675B (en) | 2015-07-02 | 2015-07-02 | A kind of luffing range of cantilever support hydraulic system and crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104986675A CN104986675A (en) | 2015-10-21 |
| CN104986675B true CN104986675B (en) | 2017-06-30 |
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| CN201510391773.1A Active CN104986675B (en) | 2015-07-02 | 2015-07-02 | A kind of luffing range of cantilever support hydraulic system and crane |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105967077B (en) * | 2016-07-19 | 2017-09-19 | 徐州重型机械有限公司 | A kind of luffing control system and its control method |
| CN106286439B (en) * | 2016-10-27 | 2018-08-28 | 安徽柳工起重机有限公司 | Crane arm cylinder control device |
| CN108469512A (en) * | 2018-04-16 | 2018-08-31 | 湖南工业职业技术学院 | Pumping resistance tests system and method |
| CN108953275A (en) * | 2018-08-21 | 2018-12-07 | 徐州重型机械有限公司 | Pile-up valve and hoisting machinery hydraulic system |
| CN109296569A (en) * | 2018-12-07 | 2019-02-01 | 湖南五新隧道智能装备股份有限公司 | A kind of arm support control system |
| CN110329912B (en) * | 2019-07-17 | 2020-07-24 | 北汽福田汽车股份有限公司 | Crane control system and crane with same |
| CN110775841B (en) * | 2019-11-01 | 2022-02-25 | 徐州重型机械有限公司 | Telescopic control system and engineering machinery |
| CN112032133B (en) * | 2020-08-27 | 2022-07-05 | 三一汽车制造有限公司 | Hydraulic control system and work vehicle |
| CN114542534A (en) * | 2022-02-25 | 2022-05-27 | 三一汽车起重机械有限公司 | Amplitude falling hydraulic control method, amplitude falling hydraulic control system and engineering machinery |
| CN114876902A (en) * | 2022-07-11 | 2022-08-09 | 中联重科股份有限公司 | Speed real-time tracking hydraulic control method and system and engineering machinery |
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| Publication number | Publication date |
|---|---|
| CN104986675A (en) | 2015-10-21 |
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