CN104675807A - Hydraulic differential control system and method as well as crane - Google Patents
Hydraulic differential control system and method as well as crane Download PDFInfo
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- CN104675807A CN104675807A CN201510109673.5A CN201510109673A CN104675807A CN 104675807 A CN104675807 A CN 104675807A CN 201510109673 A CN201510109673 A CN 201510109673A CN 104675807 A CN104675807 A CN 104675807A
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- differential
- selector valve
- hydro cylinder
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- valve
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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- 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
- B66C13/16—Applications of indicating, registering, or weighing devices
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- 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
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- 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
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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
- 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
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/25—Pressure control functions
- F15B2211/253—Pressure margin control, e.g. pump pressure in relation to load pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The embodiment of the invention discloses a hydraulic differential control system and a hydraulic differential control method as well as a crane, and relates to the hydraulic technical field. The system comprises a first reversing valve (1), a second reversing valve (2), a check valve (3), a moment limiter (4) and a controller (5). The first reversing valve (1) is arranged on an oil path through which a rodless cavity of a hydraulic differential cylinder (7) is communicated with an oil source, and communicated with an oil tank; the second reversing valve (2) is respectively communicated with the first reversing valve (1), and the rodless cavity and a rod cavity of the hydraulic differential cylinder (7); the check valve (3) is arranged on the oil path through which the second reversing valve (2) is communicated with the oil tank; the moment limiter (4) is connected with the controller (5) to transmit the actual hoisting weight detected to the controller (5); the controller (5) is connected with the control end of the second reversing valve (2) so as to control the second reversing valve (2) to change over and switch the differential state and the non-differential state of the hydraulic differential cylinder (7).
Description
Technical field
The present invention relates to technical field of hydraulic pressure, especially a kind of differential hydraulic control system and method and hoist.
Background technique
Crane operation acts by turning round, luffing, stretch, the four kinds of actions that hoist form.The luffing action of hoist is driven by oil hydraulic cylinder, and when oil hydraulic cylinder stretches out, hoist work range diminishes, and when oil hydraulic cylinder is retracted, hoist work range increases.
The off working states such as hoist transports, return the vehicle to the garage and knock off, the full reduced rear folding and unfolding of arm is on chassis overhang, and oil hydraulic cylinder is in stroke minimum position.Before hoist enters working state, operator's manipulating crane carries out luffing action makes crane movements to working position, and this process belongs to auxiliary stroke (also referred to as inoperative stroke).During auxiliary stroke, operator wishes the speed of oil hydraulic cylinder, and The faster the better, reduces service working time with this.
Hoist arrives weight of slinging behind working position, then carries out luffing action and arrives suitable position to make weight, now requires that oil hydraulic cylinder can provide larger working thrust to meet craning weight of same needs.Wish that luffing fine motion is good, namely the speed of oil hydraulic cylinder is the smaller the better simultaneously, and to meet lift heavy action needs, this process belongs to working stroke, requires that crane hydraulic cylinder can provide large thrust and speed is lower.
Crane operator completes, and carry out crane amplitude variation action arm folding and unfolding on chassis overhang, this process belongs to auxiliary stroke, and The faster the better also to require speed.
In sum: crane amplitude variation action is divided into auxiliary stroke, working stroke two-part, auxiliary stroke wishes that hydraulic cylinder speed is fast, to reduce service working time; Working stroke wishes that oil hydraulic cylinder can provide large thrust and speed is slow, to ensure the requirement of fine motion.
But, existing hydraulic system or be differential hydraulic system, or be non-differential hydraulic system.In differential hydraulic system, oil hydraulic cylinder is in differential state, can meet the requirement of auxiliary stroke, but can not meet the requirement of working stroke; But not in differential hydraulic system, oil hydraulic cylinder is in non-differential state, can meet the requirement of working stroke, but the requirement of auxiliary stroke can not be met.Therefore, a kind of hydraulic system of active demand, can either meet the requirement of auxiliary stroke, also can meet the requirement of working stroke.
Summary of the invention
Embodiment of the present invention object is: provide a kind of differential hydraulic control system and method and hoist, can either meet the requirement of auxiliary stroke, also can meet the requirement of working stroke.
According to an aspect of the present invention, a kind of differential hydraulic control system is provided, comprise: the first selector valve, the second selector valve, one-way valve, limiter of moment and controller, wherein: on the oil circuit that the rodless cavity that described first selector valve is arranged on differential hydro cylinder is communicated with oil sources, and be communicated with fuel tank; Described second selector valve is communicated with described first selector valve, the rodless cavity of differential hydro cylinder and rod chamber respectively; Described one-way valve is arranged on the oil circuit that described second selector valve is communicated with described fuel tank; Described limiter of moment is connected with described controller, and the actual lift heavy amount detected is transferred to described controller; Described controller is connected with the control end of the second selector valve, controls described second selector valve commutation, to realize the switching of differential hydro cylinder differential state and non-differential state.
In one embodiment, described second selector valve is pilot operated directional control valve; Described system also comprises: solenoid directional control valve, and described solenoid directional control valve is arranged on the oil circuit between the hydraulic control end of described second selector valve and hydraulic oil source, and the control end of described solenoid directional control valve is connected with controller.
In one embodiment, the oil circuit be communicated with the rodless cavity of differential hydro cylinder at described first selector valve is provided with equilibrium valve.
In one embodiment, also comprise relief valve, the filler opening of described relief valve is communicated with described oil sources, and the oil outlet of described relief valve is communicated with fuel tank.
In one embodiment, described second selector valve comprises the first working position and the second working position; Described second selector valve is when the first working position, and the rod chamber of described differential hydro cylinder is communicated with the oil circuit between rodless cavity; Described second selector valve is when the second working position, and the rod chamber of described differential hydro cylinder is communicated with the oil circuit between described first selector valve.
In one embodiment, described first selector valve comprises meta, the first working position and the second working position; Described second selector valve comprises the first working position and the second working position; Described first selector valve the first working position, described second selector valve at the first working position time, the rodless cavity of differential hydro cylinder is communicated with the oil circuit between oil sources, and the rod chamber of differential hydro cylinder is communicated with the oil circuit between rodless cavity; Described first selector valve the first working position, described second selector valve at the second working position time, the rodless cavity of differential hydro cylinder is communicated with the oil circuit between oil sources, and oil circuit between the rod chamber of described differential hydro cylinder and described first selector valve is communicated with; Described first selector valve the second working position, described second selector valve at the first working position time, the rodless cavity of differential hydro cylinder is communicated with the oil circuit between described fuel tank, and the rod chamber of differential hydro cylinder and rodless cavity with between oil circuit be communicated with; Described first selector valve the second working position, described second selector valve at the second working position time, the rodless cavity of differential hydro cylinder is communicated with the oil circuit between described fuel tank, and oil circuit between the rod chamber of described differential hydro cylinder and described first selector valve is communicated with.
In one embodiment, described first selector valve is three-position four-way valve.
In one embodiment, described second selector valve is two position three-way valve.
According to a further aspect in the invention, provide a kind of hoist, comprise the differential hydraulic control system that above-mentioned any embodiment provides.
According to another aspect of the invention, a kind of differential hydraulic controlling method of the differential hydraulic control system based on above-mentioned any embodiment is provided, comprises following control procedure: the actual lift heavy amount detected is transferred to controller by limiter of moment; Described controller, according to the relation of actual lift heavy amount and predefined value, controls the second selector valve commutation, to realize the mutual switching between differential hydro cylinder differential state and non-differential state.
In one embodiment, described controller, when actual lift heavy amount is less than predefined value, controls differential hydro cylinder and is in differential state; Described controller, when actual lift heavy amount is greater than predefined value, controls differential hydro cylinder and is in non-differential state.
In one embodiment, when differential hydro cylinder be in stretch out state, described controller, when actual lift heavy amount is less than predefined value, controls differential hydro cylinder and is in and differentially stretches out state; Described controller, when actual lift heavy amount is greater than predefined value, controls differential hydro cylinder and is in and non-ly differentially stretches out state; When differential hydro cylinder is in retracted mode, described controller, when actual lift heavy amount is less than predefined value, controls differential hydro cylinder and is in differential retracted mode; Described controller, when actual lift heavy amount is greater than predefined value, controls differential hydro cylinder and is in non-differential retracted mode.
The embodiment of the present invention at least has following beneficial effect:
On the one hand, according to the actual lift heavy amount that power limit device detects, current working condition requirement can be determined, thus the switching between the differential state of differential hydro cylinder and non-differential state can be carried out according to the actual requirements, the requirement of auxiliary stroke can either be met, also can meet the requirement of working stroke.Auxiliary stroke can provide low-voltage high speed operating mode, improves operating efficiency; Working stroke can provide high pressure speed operation, meets the requirement of high thrust, fine motion in operation.
On the other hand, without the need to carrying out the switching of state according to the operating experience of operator, effectively misoperation can be avoided, safe and efficient and intelligence degree is high.
Another aspect, this hydraulic control system is based on the conventional hydraulic components of hoist and control unit, and structure is simple, is easy to realize.
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a differential hydraulic control system of the present invention embodiment;
Fig. 2 is the structural representation of another embodiment of differential hydraulic control system of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.
Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.
In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
First the technical term related in the present invention is made an explanation.
Differential hydro cylinder: for pressure oil in the rodless cavity of single-piston-rod hydraulic cylinder, the oil that rod chamber is discharged is taken back rodless cavity again, and be called differential hydro cylinder, it utilizes the significant surface product moment at oil hydraulic cylinder two ends to carry out transmission.
Luffing: from truck crane rings center line to the horizontal equivalent of crane rotation center line, namely the turning radius of lifted weight or the radius of clean-up, be called work range, and the size changing work range is called luffing.
Gravity fall: when hoist work range changes from small to big (when luffing falls), the power of luffing is produced by deadweights such as arms, is called gravity fall.
Limiter of moment (being called for short power limit device): independently complete in computer-controlled SOS, can automatically detect hoist hang the quality and angle residing for shear leg of carrying, and its rated capacity and actual load, the radius of clean-up, angle residing for shear leg can be demonstrated.Real-time monitoring hoist operating mode, carries diagnostic function, and can carry out the sound control of quick hazard condition warning applications.In addition, also have black box function, the dangerous working condition automatically during record operation, for accident analysis process provides foundation.
Power limit device, controller are the vitals of hoist.Under non-lift heavy state, what power limit device showed is suspension hook weight, and under lift heavy state, what power limit device showed is the weight that suspension hook adds lift heavy.Controller is the control centre of hoist, can control the various actions of hoist.
Crane operator wishes (that is, auxiliary stroke) under non-lift heavy state, and the speed of oil hydraulic cylinder is large, thrust is little, belongs to low-voltage high speed operating mode; Under lift heavy state (that is, working stroke), the speed of oil hydraulic cylinder is little, thrust large, meets fine motion requirement, belongs to high pressure speed operation.
Fig. 1 is the structural representation of a differential hydraulic control system of the present invention embodiment.As shown in Figure 1, this system comprises: the first selector valve 1, second selector valve 2, one-way valve 3, limiter of moment 4 and controller 5, wherein:
On the oil circuit that the rodless cavity that first selector valve 1 is arranged on differential hydro cylinder 7 is communicated with oil sources, and be communicated with fuel tank; Second selector valve 2 is communicated with the first selector valve 1, the rodless cavity of differential hydro cylinder 7 and rod chamber respectively; One-way valve 3 is arranged on the oil circuit that the second selector valve 2 is communicated with fuel tank; Limiter of moment 4 is connected with controller 5, and the actual lift heavy amount detected is transferred to controller 5; Controller 5 is connected with the control end of the second selector valve 2, controls the second selector valve 2 and commutates, to realize the switching of differential hydro cylinder 7 differential state and non-differential state.
The actual lift heavy amount G that limiter of moment detects can react hoist and be in lift heavy state or be in non-lift heavy state.Specifically, a threshold value G ' can be set, such as, threshold value G ' can be set as suspension hook weight or be greater than suspension hook weight.
Controller can read the actual lift heavy amount G that limiter of moment detects, and actual lift heavy amount G is compared with threshold value G ', when actual lift heavy amount G is less than threshold value G ', can determine that hoist is in non-lift heavy state, i.e. auxiliary stroke, therefore control the second selector valve commutation, be in differential state to control differential hydro cylinder, thus meet the demand of the low-voltage high speed operating mode of large speed low thrust.Certainly, if current differential hydro cylinder is in differential state, controller is then without the need to controlling the second selector valve commutation.
When actual lift heavy amount G is greater than threshold value G ', can determine that hoist is in lift heavy state, i.e. working stroke, therefore control the second selector valve commutation, be in non-differential state to control differential hydro cylinder, thus meet the demand of the high pressure speed operation of little speed high thrust.Certainly, if current differential hydro cylinder has been in non-differential state, controller is then without the need to having controlled the second selector valve commutation again.
The actual lift heavy amount that the embodiment of the present invention detects according to power limit device, current working condition requirement can be determined, thus the switching can carried out according to the actual requirements between the differential state of differential hydro cylinder and non-differential state, the requirement of auxiliary stroke can either be met, also can meet the requirement of working stroke.Auxiliary stroke can provide low-voltage high speed operating mode, improves operating efficiency; Working stroke can provide high pressure speed operation, meets the requirement of high thrust, fine motion in operation.In addition, without the need to carrying out the switching of state according to the operating experience of operator, effectively misoperation can be avoided, safe and efficient and intelligence degree is high.In addition, this hydraulic control system is based on the conventional hydraulic components of hoist and control unit, and structure is simple, is easy to realize.
The differential hydraulic control system that the embodiment of the present invention provides is suitable for but is not limited to the changing-breadth system of hoist gravity fall, due to differential state can be switched to according to actual conditions, existing gravity decline changing-breadth system can be solved in the slow problem of luffing falling speed by a small margin.When practical application, for crane amplitude variation action, the action of hoist auxiliary stroke corresponding hoist zero load (not lift heavy) luffing; The action of working stroke corresponding craning weight of same luffing.Actions such as hoisting owing to having between hoist auxiliary stroke, working stroke, turn round, stretch, namely certain operating interval is had between the unloaded luffing of hoist, luffing with payload, therefore time lag controller can being read the actual lift heavy amount G of power limit device is set to be less than this operating interval, thus can avoid the hydraulic shock that the switching between the differential state of differential hydro cylinder and non-differential state causes.
It should be noted that, the function of the controller in the present invention can be realized by software, also can be realized by the mode of hardware.As an example of the implementation of hardware, such as, comparator can be adopted to realize the function of controller.Particularly, comparator can the size of actual lift heavy amount G and threshold value G ', when actual lift heavy amount is less than threshold value, sends low level signal, be in differential state to control differential hydro cylinder to the second selector valve; When actual lift heavy amount is greater than threshold value, sends high level signal to the second selector valve, be in non-differential state to control differential hydro cylinder.
Should be understood that if the original state of differential hydro cylinder is differential state, the second selector valve when receiving low level signal, without the need to commutation; If the original state of differential hydro cylinder is non-differential state, the second selector valve, when receiving low level signal, needs commutation to realize differential hydro cylinder by the switching of non-differential state to differential state.
In addition, also conversely, that is, when actual lift heavy amount is less than threshold value, high level signal can be sent to the second selector valve to the control mode of the second selector valve; When actual lift heavy amount is greater than threshold value, send low level signal to the second selector valve.Specific implementation is with reference to description above.
It is pointed out that as a non-limiting example, above-mentioned oil sources such as can be realized by oil hydraulic pump and fuel tank, or also can be the oil sources of other arbitrary form.
In differential hydraulic control system of the present invention, the second selector valve 2 both can be solenoid directional control valve, can be also pilot operated directional control valve, be described respectively below to both of these case.
In a kind of situation, see Fig. 1, the second selector valve 2 can be solenoid directional control valve, and controller can control its commutation by sending electrical signal to solenoid directional control valve, realizes the switching of differential hydro cylinder 7 differential state and non-differential state.Concrete handoff procedure can see the description of embodiment above.
In another kind of situation, another embodiment of differential hydraulic control system of the present invention shown in Figure 2, the second selector valve 2 can be pilot operated directional control valve.Correspondingly, this system also comprises: solenoid directional control valve 10, and this solenoid directional control valve 10 is arranged on the oil circuit between the hydraulic control end of the second selector valve 2 and hydraulic oil source, and the control end of solenoid directional control valve 10 is connected with controller 5.Here, hydraulic oil source can be oil sources as shown in Figure 2, also can take from other stable oil sources.
In this case, to switch to example by differential state to non-differential state, when needs control second selector valve 2 commutates, such as, controller can send electrical signal to solenoid directional control valve 10, solenoid directional control valve 10 is made to be operated in left position, then fluid acts on pilot operated directional control valve 2 hydraulic control end through solenoid directional control valve 10 is controlled, pilot operated directional control valve 2 is made to be in right position, the differential state of hydraulic jack in ends with system, make hydraulic jack be in non-differential state, now hydraulic jack provides high pressure speed operation, meets the requirement of hoist high thrust, fine motion.Similarly, when those skilled in the art can determine to be switched to differential state by non-differential state, controller, to the control situation of solenoid directional control valve 10 and the second selector valve 2, does not repeat them here.
As a specific embodiment, second selector valve 2 can comprise the first working position and the second working position, and when the second selector valve 2 is at the first working position, the rod chamber of differential hydro cylinder 7 is communicated with the oil circuit between rodless cavity, now, differential hydro cylinder is in differential state; When the second selector valve 2 is at the second working position, the rod chamber of differential hydro cylinder 7 is communicated with the oil circuit between the first selector valve 1, and now, differential hydro cylinder is in non-differential state.
As another specific embodiment, the first selector valve 1 can comprise meta, the first working position and the second working position, and the second selector valve 2 can comprise the first working position and the second working position.Such as, the first selector valve 1 can be three-position four-way valve, and the second selector valve 2 can be two position three-way valve.But the present invention is not limited to this, the function of the first selector valve and the second selector valve also can be realized by other valves.
Differential hydro cylinder, when stretching out or retract, all can realize the switching of differential state and non-differential state.By controlling the working position of the first selector valve, stretching out or retracted mode of differential hydro cylinder can be controlled.
Below in conjunction with the working position of the first selector valve and the second selector valve, to differential hydro cylinder differential stretch out/retracted mode and non-ly differentially to stretch out/retracted mode is described.
When the first selector valve 1 the first working position, the second selector valve 2 at the first working position time, the rodless cavity of differential hydro cylinder 7 is communicated with the oil circuit between oil sources, and the rod chamber of differential hydro cylinder 7 is communicated with the oil circuit between rodless cavity.Now, differential hydro cylinder 7 is in and differentially stretches out state.Entered the rodless cavity of differential hydro cylinder 7 by the first selector valve 1 from the hydraulic oil of oil sources, the hydraulic oil of the rod chamber of differential hydro cylinder 7 can flow to the rodless cavity of differential hydro cylinder 7 by a part of hydraulic oil after the second selector valve 2, what increase differential hydro cylinder 7 stretches out speed.
When the first selector valve 1 the first working position, the second selector valve 2 at the second working position time, the rodless cavity of differential hydro cylinder 7 is communicated with the oil circuit between oil sources, and oil circuit between the rod chamber of differential hydro cylinder 7 and the first selector valve 1 is communicated with.Now, differential hydro cylinder 7 is in and non-ly differentially stretches out state.Entered the rodless cavity of differential hydro cylinder 7 by the first selector valve 1 from the hydraulic oil of oil sources, the hydraulic oil of the rod chamber of differential hydro cylinder 7 by flowing to the first selector valve 1 after the second selector valve 2, and then flows into fuel tank.
When the first selector valve 1 the second working position, the second selector valve 2 at the first working position time, the rodless cavity of differential hydro cylinder 7 is communicated with the oil circuit between fuel tank, and the rod chamber of differential hydro cylinder 7 and rodless cavity with between oil circuit be communicated with.Now, differential hydro cylinder 7 is in differential retracted mode.A part for the hydraulic oil of the rodless cavity of differential hydro cylinder 7 flows into fuel tank by the first selector valve 1, and another part flows to the rod chamber of differential hydro cylinder 7 by the second selector valve 2, increases the retraction speed of differential hydro cylinder 7.
When the first selector valve 1 the second working position, the second selector valve 2 at the second working position time, the rodless cavity of differential hydro cylinder 7 is communicated with the oil circuit between fuel tank, and oil circuit between the rod chamber of differential hydro cylinder 7 and the first selector valve 1 is communicated with.The hydraulic oil of the rodless cavity of differential hydro cylinder 7 flows into fuel tank by the first selector valve 1, and the hydraulic oil in fuel tank is by the rod chamber repairing to differential hydro cylinder 7 of one-way valve 3 and the second selector valve 2.
In addition, as a concrete example of the first selector valve 1, when the first selector valve 1 is at meta, the second selector valve 2 can be communicated with fuel tank by the restriction in the valve rod of the first selector valve 1.Now, namely differential hydro cylinder 7 does not do and stretches out motion, does not do retraction movement yet.
In another embodiment of differential hydraulic control system of the present invention, see Fig. 1 or Fig. 2, the oil circuit that first selector valve 1 is communicated with the rodless cavity of differential hydro cylinder 7 is provided with equilibrium valve 8, to ensure that differential hydro cylinder 7 is steady in retraction hourly velocity, avoids the generation of stall event.
In another embodiment of differential hydraulic control system of the present invention, see Fig. 1 or Fig. 2, also bag can comprise relief valve 9, and the filler opening of relief valve 9 is communicated with oil sources, and the oil outlet of relief valve 9 is communicated with fuel tank.Can the supply pressure of restriction system by arranging relief valve, such as when system pressure is greater than 20MPa, relief valve is opened, to reduce the supply pressure of system.
The present invention is based in an embodiment of the differential hydraulic controlling method of the differential hydraulic control system that above-mentioned any embodiment provides, comprise following control procedure:
The actual lift heavy amount detected is transferred to controller 5 by limiter of moment 4; Controller 5, according to the relation of actual lift heavy amount and predefined value, controls the second selector valve 2 and commutates, to realize the mutual switching between differential hydro cylinder 7 differential state and non-differential state.
The actual lift heavy amount that the present embodiment detects according to power limit device, current working condition requirement can be determined, thus the switching can carried out according to the actual requirements between the differential state of differential hydro cylinder and non-differential state, the requirement of auxiliary stroke can either be met, also can meet the requirement of working stroke.Auxiliary stroke can provide low-voltage high speed operating mode, improves operating efficiency; Working stroke can provide high pressure speed operation, meets the requirement of high thrust, fine motion in operation.In addition, without the need to carrying out the switching of state according to the operating experience of operator, effectively misoperation can be avoided, safe and efficient and intelligence degree is high.
In another embodiment of differential hydraulic controlling method of the present invention, controller 5 is when actual lift heavy amount is less than predefined value, by controlling the second selector valve 2, the rod chamber of differential hydro cylinder 7 is communicated with the oil circuit between rodless cavity, thus control differential hydro cylinder 7 is in differential state; Controller 5, when actual lift heavy amount is greater than predefined value, by controlling the second selector valve 2, makes the oil circuit between the rod chamber of differential hydro cylinder 7 with the first selector valve 1 be communicated with, thus control differential hydro cylinder 7 is in non-differential state.
In another embodiment of differential hydraulic controlling method of the present invention, no matter differential hydro cylinder 7 is in the state of stretching out or is in retracted mode, all can realize the switching of differential state and non-differential state, explain respectively below.
Such as, the second selector valve be in different working positions time, differential hydro cylinder 7 is in and stretches out or retracted mode.
When differential hydro cylinder 7 be in stretch out state, controller 5, when actual lift heavy amount is less than predefined value, controls differential hydro cylinder 7 and is in and differentially stretches out state; Controller 5, when actual lift heavy amount is greater than predefined value, controls differential hydro cylinder 7 and is in and non-ly differentially stretches out state.
When differential hydro cylinder 7 is in retracted mode, controller 5, when actual lift heavy amount is less than predefined value, controls differential hydro cylinder 7 and is in differential retracted mode; Controller 5, when actual lift heavy amount is greater than predefined value, controls differential hydro cylinder 7 and is in non-differential retracted mode.
It is pointed out that when controlling differential hydro cylinder 7 and being in differential state or non-differential state, the conducting situation of oil circuit with reference to the associated description of said system and/or embodiment of the method, just no longer can describe in detail at this.
Differential hydraulic control system of the present invention can be applied on hoist.
In an embodiment of hoist provided by the invention, the hydraulic differential control system in above-mentioned any embodiment can be comprised.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that programming instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
In describing the invention; it will be appreciated that; use " first ", " second ", etc. word limit component; be only used to be convenient to distinguish above-mentioned parts; as there is no Stated otherwise; above-mentioned word does not have particular meaning, therefore can not be interpreted as limiting the scope of the invention.
Claims (12)
1. a differential hydraulic control system, is characterized in that, comprising: the first selector valve (1), the second selector valve (2), one-way valve (3), limiter of moment (4) and controller (5), wherein:
On the oil circuit that the rodless cavity that described first selector valve (1) is arranged on differential hydro cylinder (7) is communicated with oil sources, and be communicated with fuel tank; Described second selector valve (2) is communicated with described first selector valve (1), the rodless cavity of differential hydro cylinder (7) and rod chamber respectively; Described one-way valve (3) is arranged on the oil circuit that described second selector valve (2) is communicated with described fuel tank; Described limiter of moment (4) is connected with described controller (5), and the actual lift heavy amount detected is transferred to described controller (5); Described controller (5) is connected with the control end of the second selector valve (2), controls the commutation of described second selector valve (2), to realize the switching of differential hydro cylinder (7) differential state and non-differential state.
2. system according to claim 1, is characterized in that, described second selector valve (2) is pilot operated directional control valve;
Described system also comprises: solenoid directional control valve (10), described solenoid directional control valve (10) is arranged on the oil circuit between the hydraulic control end of described second selector valve (2) and hydraulic oil source, and the control end of described solenoid directional control valve (10) is connected with controller (5).
3. system according to claim 1, is characterized in that, the oil circuit that described first selector valve (1) is communicated with the rodless cavity of differential hydro cylinder (7) is provided with equilibrium valve (8).
4. system according to claim 1, is characterized in that, also comprises relief valve (9), and the filler opening of described relief valve (9) is communicated with described oil sources, and the oil outlet of described relief valve (9) is communicated with fuel tank.
5. system according to claim 1, is characterized in that, described second selector valve (2) comprises the first working position and the second working position;
Described second selector valve (2) is when the first working position, and the rod chamber of described differential hydro cylinder (7) is communicated with the oil circuit between rodless cavity; Described second selector valve (2) is when the second working position, and the rod chamber of described differential hydro cylinder (7) is communicated with the oil circuit between described first selector valve (1).
6. system according to claim 1, is characterized in that, described first selector valve (1) comprises meta, the first working position and the second working position; Described second selector valve (2) comprises the first working position and the second working position;
Described first selector valve (1) the first working position, described second selector valve (2) at the first working position time, the rodless cavity of differential hydro cylinder (7) is communicated with the oil circuit between oil sources, and the rod chamber of differential hydro cylinder (7) is communicated with the oil circuit between rodless cavity; Described first selector valve (1) the first working position, described second selector valve (2) at the second working position time, the rodless cavity of differential hydro cylinder (7) is communicated with the oil circuit between oil sources, and the oil circuit between the rod chamber of described differential hydro cylinder (7) and described first selector valve (1) is communicated with;
Described first selector valve (1) the second working position, described second selector valve (2) at the first working position time, the rodless cavity of differential hydro cylinder (7) is communicated with the oil circuit between described fuel tank, and the rod chamber of differential hydro cylinder (7) and rodless cavity with between oil circuit be communicated with; Described first selector valve (1) the second working position, described second selector valve (2) at the second working position time, the rodless cavity of differential hydro cylinder (7) is communicated with the oil circuit between described fuel tank, and the oil circuit between the rod chamber of described differential hydro cylinder (7) and described first selector valve (1) is communicated with.
7. system according to claim 1, is characterized in that, described first selector valve (1) is three-position four-way valve.
8. system according to claim 1, is characterized in that, described second selector valve (2) is two position three-way valve.
9. a hoist, is characterized in that, comprises the differential hydraulic control system described in claim 1-8 any one.
10. based on a differential hydraulic controlling method for the differential hydraulic control system described in claim 1-8 any one, it is characterized in that, comprise following control procedure:
The actual lift heavy amount detected is transferred to controller (5) by limiter of moment (4); Described controller (5), according to the relation of actual lift heavy amount and predefined value, controls the second selector valve (2) commutation, to realize the mutual switching between differential hydro cylinder (7) differential state and non-differential state.
11. methods according to claim 9, is characterized in that,
Described controller (5), when actual lift heavy amount is less than predefined value, controls differential hydro cylinder (7) and is in differential state;
Described controller (5), when actual lift heavy amount is greater than predefined value, controls differential hydro cylinder (7) and is in non-differential state.
12. methods according to claim 9, is characterized in that,
When differential hydro cylinder (7) be in stretch out state, described controller (5), when actual lift heavy amount is less than predefined value, controls differential hydro cylinder (7) and is in and differentially stretches out state; Described controller (5), when actual lift heavy amount is greater than predefined value, controls differential hydro cylinder (7) and is in and non-ly differentially stretches out state;
When differential hydro cylinder (7) is in retracted mode, described controller (5), when actual lift heavy amount is less than predefined value, controls differential hydro cylinder (7) and is in differential retracted mode; Described controller (5), when actual lift heavy amount is greater than predefined value, controls differential hydro cylinder (7) and is in non-differential retracted mode.
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| CN201510109673.5A CN104675807B (en) | 2015-03-12 | 2015-03-12 | Differential hydraulic control system and method and crane |
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