CN102734247B - Flow control system and method of multi-way directional valve and engineering machinery - Google Patents
Flow control system and method of multi-way directional valve and engineering machinery Download PDFInfo
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Abstract
The invention provides a flow control system of a multi-way directional valve, comprising a pressure oil source, the multi-way directional valve, a flow control valve and a controller, wherein pressure oil supplied by the pressure oil source is connected to a port P of the multi-way directional valve through an oil inlet way, a port T of the multi-way directional valve is communicated with an oil return way, a working port of the multi-way directional valve is connected with an execution mechanism, an oil inlet of the flow control valve is communicated with the oil inlet way, an oil outlet of the flow control valve is communicated with the oil return way, and the controller is connected with the multi-way directional valve and the flow control valve and can regulate the oil flow of the flow control valve released to the oil return way according to a displacement signal of a valve core of the multi-way directional valve. According to the flow control system disclosed by the invention, on the premise of satisfying the flow needs of the execution mechanism, the flow entering the execution mechanism is smoothly controlled, so that the smooth operation of the execution mechanism is guaranteed, the impact is small, and the pressure loss of the system is small. The invention also provides a flow control method of the multi-way directional valve and engineering machinery.
Description
Technical field
The present invention relates to technical field of engineering machinery, in particular to a kind of flow control system and controlling method of multiple directional control valve, use the engineering machinery of the flow control system of above-mentioned multiple directional control valve.
Background technique
In the engineering machinery, usually adopt multiple directional control valve to control the action of many actuators, in system's running, need to satisfy the requirement that startup is steady, impact is little and the system pressure loss is little.Multiple directional control valve generally includes six flow-through multiple directional control valves and four-way type multiple directional control valve at present, owing to being subject to the restriction of multiple directional control valve flow control mode, often can not satisfy simultaneously above-mentioned requirements.
Six flow-through multiple directional control valves as shown in Figure 1, when spool was in meta, the pressure oil of multiple directional control valve was through the direct oil sump tank of meta oil duct of each connection selector valve; In the spool moving process, the meta oil duct is closed gradually, the flow that enters actuator increases gradually, thereby actuator starts steadily without impacting, but the loss of meta choke pressure is large, and the connection number of selector valve is more, and the choke pressure loss is larger, therefore cause the hydraulic system pressure loss large, heating value is large.
Four-way type multiple directional control valve as shown in Figure 2, when spool is in meta, the control access C of unloading valve A is connected to fuel tank, partial pressure oil is flowed through and is produced pressure difference when damping hole B on the unloading valve A enters control access C, make the pressure of the spring chamber of unloading valve A be lower than the M chamber, therefore the valve port of unloading valve A overcomes spring force and opens under the pressure difference effect in spring chamber and M chamber, thereby makes the most of oil passage D oil sump tank of flowing through.The choke pressure loss of spool when meta is little, and irrelevant with the connection number of selector valve, but because the pent moment of control access C of unloading valve A, unloading valve A closes suddenly, so the compression shock of multiple directional control valve in commutation process is larger, spool does not possess the fine setting characteristic substantially, therefore causes system's operation not steady, and speed adjusting performance is poor.
Therefore, how to provide a kind of flow control system of multiple directional control valve, that can realize actuator operates steadily, impacts the little advantage of little and system pressure loss, has become those skilled in the art's technical issues that need to address.
Summary of the invention
Consider the above-mentioned background technology, the invention provides a kind of flow control system and controlling method of multiple directional control valve, guaranteed operating steadily of actuator, impact little and system pressure loss little.The invention allows for a kind of engineering machinery of using the flow control system of above-mentioned multiple directional control valve.
According to an aspect of the present invention, a kind of flow control system of multiple directional control valve is provided, comprise: pressure oil-source, multiple directional control valve, flow control valve and controller, wherein, the pressure oil that pressure oil-source provides is connected to the P mouth of described multiple directional control valve by in-line, the T mouth of described multiple directional control valve is communicated with oil circuit, and the working hole of described multiple directional control valve is connected with actuator; The filler opening of described flow control valve is communicated with described in-line, and oil outlet is communicated with described oil circuit; Described controller is connected with multiple directional control valve with described flow control valve respectively, and described controller can be according to the displacement signal of the spool of described multiple directional control valve, regulates described flow control valve and lets out flow to described oil circuit.
According to the flow control system of multiple directional control valve of the present invention, controller comes the displacement of the spool of adjust flux control valve according to the displacement signal of the spool of multiple directional control valve, thereby the adjust flux control valve is let out the flow to described oil circuit; In this flow control system, let out flow to described oil circuit by the adjust flux control valve, with the flow through flow of this multiple directional control valve of adjusting, thereby under the prerequisite of the traffic demand that satisfies actuator, control reposefully the flow that enters actuator, to guarantee that actuator operates steadily, impact little and the system pressure loss little.
In technique scheme, preferably, controller obtains the displacement signal of the spool of described multiple directional control valve according to the electrical signal of the valve core movement of every selector valve in the pressure signal on the pilot control oil circuit of every selector valve in the described multiple directional control valve that obtains or the described multiple directional control valve of control that obtains.
When described multiple directional control valve is pilot operated directional control valve, can comprise pressure transducer, be arranged on the pilot control oil circuit of every selector valve in the described multiple directional control valve, be used for gathering the pressure signal on the described pilot control oil circuit; Described controller obtains the displacement signal of the spool of described multiple directional control valve according to the pressure signal of described pressure transducer collection.Can adopt the pilot control oil circuit to control the motion of the spool of every selector valve in the multiple directional control valve, utilize pressure transducer to gather pressure signal on this pilot control oil circuit, just can obtain according to the pressure signal that gathers the displacement signal of every selector valve by corresponding conversion relation, this mode is to obtain a kind of optimal way of displacement signal of the spool of every selector valve.
When described multiple directional control valve was electric control reversing valve, described controller obtained the displacement signal of the spool of described multiple directional control valve according to the electrical signal of the valve core movement of the described multiple directional control valve of control.Adopt electrical signal to control the valve core movement of multiple directional control valve, controller can obtain according to this electrical signal the displacement signal of spool, and this mode is to obtain a kind of optimal way of displacement signal of the spool of every selector valve equally.
In technique scheme, can control by actuation member the valve core movement of described multiple directional control valve, described actuation member is used for controlling instruction to described controller transmission, described controller is controlled the electrical signal that instruction generates the valve core movement of the described multiple directional control valve of control according to described, with the motion of the spool of controlling described multiple directional control valve.This actuation member is remote controller for example, is used for sending to controller controlling instruction, and controller is controlled the electrical signal of the valve core movement that instruction just can controlled multiple directional control valve according to this, thereby obtains the displacement signal of the spool of described multiple directional control valve.
In above-mentioned arbitrary technological scheme, preferably, can also comprise displacement transducer, be arranged on every selector valve of described multiple directional control valve, for the displacement signal of the spool that obtains described multiple directional control valve.Can directly obtain the displacement signal of the spool of multiple directional control valve by displacement transducer, need not the conversion of other elements, this displacement transducer can be arranged on every selector valve of multiple directional control valve.
In above-mentioned arbitrary technological scheme, preferably, described controller can be according to the displacement signal of the spool of described multiple directional control valve, regulates the pressure on the pilot control oil circuit of described flow control valve, to regulate described flow control valve; Perhaps, described controller can according to the displacement signal of the spool of described multiple directional control valve, send electrical signal to described flow control valve, to regulate described flow control valve.
The regulative mode of flow control valve also can be divided into hydraulic control mode and electric control mode, when adopting the hydraulic control mode, controller can send electrical signal to pilot valve, regulates pressure on the pilot control oil circuit and then the valve core movement of adjust flux control valve by pilot valve; When adopting automatically controlled mode, controller directly sends to electrical signal the control end of flow control valve, and then the valve core movement of adjust flux control valve.
In above-mentioned arbitrary technological scheme, preferably, when described pressure oil-source comprised variable displacement pump, described controller can according to the displacement signal of the spool of described multiple directional control valve, send the discharge capacity regulated signal to described variable displacement pump, to regulate described variable pump delivery.
Pressure oil-source adopts variable displacement pump, when the system requirements flow reduces, reduces the oil inlet quantity of variable displacement pump, and then flow control valve needs corresponding the reducing of flow of off-load, and then saves system capacity; And can the Moderator Variable pump, multiple directional control valve and flow control valve three's flow matches, more steadily control the action of actuator.
In above-mentioned arbitrary technological scheme, preferably, described flow control valve is throttle valve or series flow control valve.
In above-mentioned arbitrary technological scheme, preferably, described multiple directional control valve is four-way type multiple directional control valve.In this flow control system, adopt four-way type multiple directional control valve, and in the bypass of four-way type multiple directional control valve flow control valve is set, system is simple and easy to realize, because the loss of the choke pressure of four-way type multiple directional control valve is little, the flow control system of this four-way type multiple directional control valve, can steadily control the flow that enters actuator, operate steadily to guarantee actuator, impact little and system pressure loss little, therefore, this four-way type multi-way valve has been taken into account the six-way multiple unit valve good speed adjustment features, and the strong characteristics of performance are controlled in fine motion.
In above-mentioned arbitrary technological scheme, preferably, described flow control valve is integrated in the described multiple directional control valve.
According to another aspect of the invention, also provide a kind of engineering machinery, comprised the flow control system such as the multiple directional control valve described in above-mentioned arbitrary technological scheme.
According to a further aspect in the invention, a kind of flow control method of multiple directional control valve also is provided, be used for comprising the hydraulic control system of multiple directional control valve, flow control valve and controller, described flow control valve is arranged in the bypass of described multiple directional control valve, wherein: described controller obtains the displacement signal of the spool of described multiple directional control valve; Described controller generates the control signal of described flow control valve according to the described displacement signal of the spool of described multiple directional control valve; Regulate the draining flow of described flow control valve according to described control signal.
According to the flow control system of multiple directional control valve of the present invention, controller comes the displacement of the spool of adjust flux control valve according to the displacement signal of the spool of multiple directional control valve, thereby the adjust flux control valve is let out the flow to described oil circuit; In this flow control system, let out flow to described oil circuit by the adjust flux control valve, with the flow through flow of this multiple directional control valve of adjusting, thereby under the prerequisite of the traffic demand that satisfies actuator, control reposefully the flow that enters actuator, to guarantee that actuator operates steadily, impact little and the system pressure loss little.
In above-mentioned arbitrary technological scheme, preferably, can obtain the spool aperture of described multiple directional control valve according to the described displacement signal of the spool of described multiple directional control valve; Obtain the traffic demand of actuator according to described spool aperture, according to the total discharge of input and the traffic demand of described actuator, generate the control signal of described flow control valve.
In above-mentioned arbitrary technological scheme, preferably, described controller can be according to the displacement signal of the spool of described multiple directional control valve, regulates the pressure on the pilot control oil circuit of described flow control valve, to regulate described flow control valve; Perhaps described controller can according to the displacement signal of the spool of described multiple directional control valve, send electrical signal to described flow control valve, to regulate described flow control valve.
The regulative mode of flow control valve also can be divided into hydraulic control mode and electric control mode, when adopting the hydraulic control mode, at this moment, controller can send electrical signal to pilot valve, regulate pressure on the pilot control oil circuit and then the valve core movement of adjust flux control valve by pilot valve; When adopting automatically controlled mode, controller directly sends to electrical signal the control end of flow control valve, and then the valve core movement of adjust flux control valve.
In above-mentioned arbitrary technological scheme, preferably, when described pressure oil-source comprised variable displacement pump, described controller can according to the displacement signal of the spool of described multiple directional control valve, send the discharge capacity regulated signal to described variable displacement pump, to regulate described variable pump delivery.When pressure oil-source adopts variable displacement pump, when the demand volume of system reduces, reduce the variable pump delivery, then flow control valve needs corresponding the reducing of flow of off-load, and then saves system capacity; And can the Moderator Variable pump, multiple directional control valve and flow control valve three's flow matches, more steadily control the action of actuator.
Description of drawings
Fig. 1 is the structural representation of six flow-through multiple directional control valves in the correlation technique;
Fig. 2 is the structural representation of four-way type multiple directional control valve in the correlation technique;
Fig. 3 is the schematic diagram of a kind of flow control system of multiple directional control valve among the present invention;
Fig. 4 is the schematic diagram of the flow control system of multiple directional control valve in the first embodiment of the invention;
Fig. 5 is the schematic diagram of the flow control system of multiple directional control valve in the second embodiment of the invention;
Fig. 6 is the schematic diagram of the flow control system of multiple directional control valve in the third embodiment of the invention.
Embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments the present invention is further described in detail.
With reference to figure 3, the flow control system of a kind of multiple directional control valve that the present invention proposes, comprise: pressure oil-source 1, multiple directional control valve 2, flow control valve 3 and controller 4, wherein, the pressure oil that pressure oil-source 1 provides is connected to the P mouth of multiple directional control valve 2 by in-line, the T mouth of multiple directional control valve 2 is communicated with oil circuit, and the working hole of multiple directional control valve 2 is connected with actuator 7; The filler opening of described flow control valve 3 is communicated with described in-line, and oil outlet is communicated with described oil circuit; Described controller 4 is connected with described multiple directional control valve 2, described flow control valve 3, and described controller 4 can be according to the displacement signal of the spool of described multiple directional control valve 2, regulates described flow control valve 3 and lets out flow to described oil circuit.
According to the flow control system of multiple directional control valve of the present invention, controller comes the displacement of the spool of adjust flux control valve according to the displacement signal of the spool of multiple directional control valve, thereby the adjust flux control valve is let out the flow to oil circuit; In this flow control system, let out flow to oil circuit by the adjust flux control valve, with the flow through flow of this multiple directional control valve of adjusting, thereby under the prerequisite of the traffic demand that satisfies actuator, control reposefully the flow that enters actuator, to guarantee that actuator operates steadily, impact little and the system pressure loss little.
In the specific embodiment of the invention, can the displacement signal that controller obtains the spool of multiple directional control valve 2 be described, concrete, be pilot operated directional control valve at multiple directional control valve 2, controller can be according to the pressure signal on the pilot control oil circuit of every selector valve in the multiple directional control valve that obtains, thereby obtain the displacement signal of the spool of multiple directional control valve, be electric control reversing valve at multiple directional control valve 2, controller can be according to the electrical signal of the valve core movement of every selector valve in the control multiple directional control valve that obtains, thereby obtains the displacement signal of the spool of multiple directional control valve.
To Fig. 6, in the flow control system of the multiple directional control valve that the specific embodiment of the invention proposes, multiple directional control valve 2 comprises three selector valves with reference to figure 4, and its corresponding spool is respectively selector valve 21,22 and 23; Pressure oil-source 1 among Fig. 4 is metering pump, pressure oil-source 1 among Fig. 5 and Fig. 6 is variable displacement pump, the pressure oil that pressure oil-source 1 provides is connected to the P mouth of three selector valves in the multiple directional control valve 2 by in-line, at in-line relief valve 5 is set, the T mouth of three selector valves all is communicated with oil circuit, the working hole of three selector valves is connected with corresponding actuator respectively, can control respectively corresponding actuator's action, and actuator can be the hydraulic element such as oil cylinder, motor.Flow control valve 3 is arranged in the bypass of multiple directional control valve 2, and the filler opening of flow control valve 3 is communicated with in-line, and oil outlet is communicated with oil circuit.
As shown in Figure 4, in the flow control system of the multiple directional control valve that first embodiment of the invention proposes, multiple directional control valve 2 is pilot operated directional control valve, adopt the pilot control oil circuit to control the motion of the spool of every selector valve, displacement for the spool that obtains multiple directional control valve, pilot control oil circuit at every selector valve arranges pressure transducer 6, is used for gathering the pressure signal on the pilot control oil circuit; For example, correspondence arranges two pressure transducers on the pilot control oil circuit of every selector valve, on the pilot control oil circuit of selector valve 21, pressure transducer is for detection of the pressure signal of pilot control oil XA1, and another pressure transducer is for detection of the pressure signal of pilot control oil XB2; Pressure signal in the multiple directional control valve that controller 4 collects according to pressure transducer 6 on the pilot control oil circuit of every selector valve can obtain the displacement signal of the spool of corresponding selector valve.
Therefore, when multiple directional control valve 2 is pilot operated directional control valve, utilize pressure transducer 6 to gather pressure signal on the pilot control oil circuit of every selector valve, just can obtain according to the pressure signal that gathers the displacement signal of the spool of every selector valve by corresponding conversion relation, this mode is to obtain a kind of optimal way of displacement signal of the spool of every selector valve.
As shown in Figure 5, in the flow control system of the multiple directional control valve that second embodiment of the invention proposes, multiple directional control valve 2 is electric control reversing valve, valve core movement by input electrical signal control multiple directional control valve 2, controller obtains the displacement signal of the spool of multiple directional control valve according to the electrical signal of the valve core movement of control multiple directional control valve.
In actual application, control instruction by the actuation member input, for example, actuation member is remote control handle, remote control handle is controlled instruction according to user's operation to controller 4 transmissions, controller 4 is according to the electrical signal of the valve core movement of controlling instruction generation control multiple directional control valve, respectively to join the motion of the spool of selector valve in the control multiple directional control valve.In said process, controller is controlled the electrical signal that instruction can obtain to control the valve core movement of every selector valve in the multiple directional control valve according to this, thereby obtains the displacement signal of the spool of multiple directional control valve.
In the above in the described content, by gathering the pressure on the pilot control oil circuit or indirectly obtaining the displacement signal of the spool of multiple directional control valve 2 according to the electrical signal of the valve core movement of every selector valve in the control multiple directional control valve, can also displacement transducer be set at every selector valve of multiple directional control valve 2 in actual applications, adopt this displacement transducer directly to obtain the displacement signal of the spool of multiple directional control valve 2; Can directly obtain like this displacement signal of the spool of multiple directional control valve by displacement transducer, need not other elements and change.
In the specific embodiment of the invention, controller 4 is according to the displacement signal of the spool of multiple directional control valve 2, adjust flux control valve 3 is let out the flow to oil circuit, in actual application, when flow control valve 3 is hydraulic control valve, controller 4 can be according to the displacement signal of the spool of multiple directional control valve, pilot valve on the pilot control oil circuit sends electrical signal, and then by the pressure on the pilot control oil circuit of pilot valve adjust flux control valve 3, with adjust flux control valve 3, thus the dredge oil amount of control flow control valve 3; When flow control valve 3 was electrically-controlled valve, controller 4 can be according to the displacement signal of the spool of multiple directional control valve, and controller 4 sends electrical signal to the control end of flow control valve 3, with adjust flux control valve 3, thus the dredge oil amount of control flow control valve 3.
As illustrated in Figures 5 and 6, in the flow control system of the multiple directional control valve that second embodiment of the invention and the 3rd embodiment propose, pressure oil-source 1 is variable displacement pump, in flow control system work, controller 4 can be according to the displacement signal of the spool of multiple directional control valve, send the discharge capacity regulated signal to variable displacement pump, with the pressure oil discharge capacity of Moderator Variable pump.Above-mentioned flow control valve 3 can be integrated in the pressure oil-source 1, for example, flow control valve 3 can be integrated in metering pump or the variable displacement pump.
In this flow control system, pressure oil-source 1 adopts variable displacement pump, when the system requirements flow reduces, reduces the variable pump delivery, and then flow control valve needs corresponding the reducing of flow of off-load, and then the energy of the system of saving; Can the Moderator Variable pump, multiple directional control valve 2 and flow control valve 3 threes' flow matches, the oil inlet quantity that guarantees actuator slowly changes, the steadily action of control actuator, and the fine setting performance of multiple directional control valve is good, and this fine setting performance mainly is to be embodied by being used in conjunction with of flow control valve 3.
Can the fine setting performance of multiple directional control valve be that control characteristic is made in fine motion, namely control reposefully the small action of actuator when the spool of selector valve is in small aperture.Normally, existing multiple directional control valve only carries out fine motion by the small aperture of the throttling groove that arranges on the spool to be regulated, and in flow control system of the present invention, except the throttling groove by change-over valve core carries out the adjusting of fine motion do, throttling action in the time of can also being in small aperture by flow control valve is carried out fine motion and is regulated, namely taked simultaneously entrance throttle governing circuit (variable displacement pump) and two kinds of compound modes of bypass throttle speed governing (flow control valve) to finely tune, the wider of adjusting made in its fine motion, and degree of regulation is higher.
In above-mentioned specific embodiment, multiple directional control valve 2 adopts four-way type multiple directional control valve, and flow control valve 3 can be throttle valve or series flow control valve.In this embodiment, adopt four-way type multiple directional control valve in the flow control system, and in the bypass of four-way type multiple directional control valve flow control valve is set, system is simple and easy to realize, because the loss of the choke pressure of four-way type multiple directional control valve is little, the flow control system of this four-way type multiple directional control valve, can steadily control the flow that enters actuator, operate steadily to guarantee actuator, impact little and system pressure loss little, therefore, this four-way type multi-way valve has been taken into account the six-way multiple unit valve good speed adjustment features, and the strong characteristics of performance are controlled in fine motion.
Based on foregoing description, in Fig. 4 in the flow control system of multiple directional control valve, selector valve 21 is in running order lower in multiple directional control valve 2, if acting on spool and the pressure of selector valve 21, pilot control oil XA1 rises gradually, then the spool aperture of selector valve 1 slowly increases, pressure transducer 6 detects the pressure signal of pilot control oil XA1, controller 4 learns that according to this pressure signal the spool aperture of selector valve 21 increases just gradually, controller 4 sends regulated signal to flow control valve 3, aperture with control flow control valve 3 slowly reduces, so that pressure oil enters in the actuator by selector valve 21 reposefully, guarantee that actuator starts steadily without impacting; When the guide controlled oily XB1 and acts on the spool of this selector valve 21, the spool of selector valve 21 and flow control valve 3 still carried out the coupling of throttle opening in above-mentioned mode, and just according to actual conditions, the matching relationship of the two throttle opening is different.The matching way of throttle opening that respectively joins the spool of selector valve and flow control valve 3 in the multiple directional control valve 2 is same as described above.When this flow control system is not worked, the spool of three selector valves all is in meta in the multiple directional control valve, this moment, the valve port of flow control valve 3 was in full-gear, and the unnecessary hydraulic oil of system passes through these flow control valve 3 oil sump tanks, and this moment, flow control valve 3 can play the function of meta drain charge.
In Fig. 4, in the flow control system of multiple directional control valve, when selector valve 21,22 carries out composite move in the multiple directional control valve 2, suppose that pilot control oil XA1 and XA2 work.In the actual job process according to the operating mode demand, for the speed that satisfies respective execution mechanisms or the requirement of driving force, the spool aperture of selector valve 21 and selector valve 22 is often inconsistent, and namely the force value of the pilot control oil XA2 of the spool of the pilot control of the spool of selector valve 21 oil XA1 and selector valve 22 is constantly to change.
The pressure signal of pressure transducer 6 Real-time Collection pilot controls oil XA1 and XA2, controller 4 can obtain according to this pressure signal the displacement signal of the spool of current every selector valve, calculate the traffic demand of each actuator according to the displacement signal of the spool of every selector valve, and then the total traffic demand of the system that obtains, according to the oil inlet quantity of pressure oil-source and the total discharge demand of actuator, control flow control valve 3 is let out the flow to oil circuit again.
Concrete, based on the displacement signal of the spool of every selector valve, can determine the passage section area of the orifice of selector valve, then the flow general formula can obtain the traffic demand of actuator:
Q=CArΔP
Ψ，
Wherein, Q is the flow of selector valve, C is the coefficient that is determined by the shape of orifice, size and liquid property, Ar is the passage section area of selector valve orifice, Δ P is the pressure at two ends of orifice poor (can set a value range or a definite value according to user's demand), the index that Ψ has the slenderness ratio of orifice to determine; Just can obtain the traffic demand of actuator after the above-mentioned formula of passage section area substitution according to the determined orifice of displacement signal of spool.
By above-mentioned computational process, obtain the demand volume of the corresponding actuator of selector valve 21 and selector valve 22, obtain the total discharge demand of actuator in this flow control system after both additions; Then, according to the oil inlet quantity of pressure oil-source and the traffic demand of each actuator, obtain flow control valve and need let out flow to oil circuit.
In actual application, according to the working procedure under a certain state in the above-mentioned flow control system, when the spool that respectively joins selector valve in the multiple directional control valve is in mobile status, controller can be according to the displacement signal of the spool of multiple directional control valve, adjust flux control valve 3 has been realized the function of the off-load flow of dynamic control flow dontroller 4.
Those skilled in the art should be appreciated that, above-mentioned flow control valve 3 can be integrated in the multiple directional control valve 2, for example, flow control valve is integrated in the valve body of four-way type multiple directional control valve, and its compact structure can reach same technique effect.
The present invention proposes a kind of engineering machinery, comprise the flow control system of multiple directional control valve as described above, this project machinery can be concrete mixer, excavator etc.
The flow control method of multiple directional control valve according to an embodiment of the invention, be used for comprising the hydraulic control system of pressure oil-source, multiple directional control valve, flow control valve and controller, this flow control valve is arranged in the bypass of multiple directional control valve, for example, can be applied to the flow control system of the multiple directional control valve shown in Fig. 3 to Fig. 6, the flow control method of this multiple directional control valve can may further comprise the steps:
Step S1, controller obtain the displacement signal of the spool of multiple directional control valve;
Step S2, controller generate the control signal of flow control valve according to the displacement signal of the spool of multiple directional control valve;
Step S3 according to the draining flow of control signal adjust flux control valve, makes the flow of the multiple directional control valve of flowing through satisfy the traffic demand of actuator.
Therefore, flow control system according to multiple directional control valve of the present invention, controller comes the displacement of the spool of adjust flux control valve according to the displacement signal of the spool of multiple directional control valve, let out flow to oil circuit by the adjust flux control valve, with the flow through flow of this multiple directional control valve of adjusting, thereby control enters the flow of actuator reposefully under the prerequisite of the traffic demand that satisfies actuator, operates steadily to guarantee actuator, impacts little and system pressure loses little.
In step S1, obtain the displacement signal of the spool of multiple directional control valve, can adopt various ways:
The pilot control oil circuit of every selector valve arranges pressure transducer in multiple directional control valve, and pressure transducer gathers the pressure signal on the pilot control oil circuit; Controller obtains the displacement signal of the spool of multiple directional control valve according to pressure signal.Controller obtains the electrical signal of the valve core movement of control multiple directional control valve, obtains the displacement signal of the spool of multiple directional control valve according to electrical signal.Concrete, adopting actuation member to send to controller and control instruction, controller is according to the electrical signal of the valve core movement of controlling instruction generation control multiple directional control valve.This actuation member is remote controller for example, can send to controller and control instruction, and controller is controlled the electrical signal of the valve core movement that instruction just can controlled multiple directional control valve according to this.Every selector valve at multiple directional control valve is provided with displacement transducer, and controller obtains the displacement signal of the spool of multiple directional control valve by displacement transducer.
In step S2, the detailed process that generates the control signal of flow control valve is: the spool aperture that can obtain multiple directional control valve according to the displacement signal of the spool of multiple directional control valve; Obtain the traffic demand of actuator according to the spool aperture, according to the total discharge of input and the traffic demand of actuator, generate the control signal of flow control valve.
In concrete the application, displacement according to spool can be determined the spool aperture, and the spool aperture is associated with the passage section area, therefore, after determining the spool aperture, can get access to the traffic demand of actuator, according to the total discharge of pressure oil-source input and the traffic demand of actuator, obtain the off-load flow of flow control valve, thereby generate the control signal of flow control valve with adjust flux control valve 3, thereby so that pressure oil enters in the actuator by selector valve reposefully, guarantee that actuator starts steadily without impacting.
In step S3, controller can be according to the displacement signal of the spool of multiple directional control valve, and the pressure on the pilot control oil circuit of adjust flux control valve is with the adjust flux control valve; Perhaps controller can according to the displacement signal of the spool of multiple directional control valve, send electrical signal to flow control valve, with the adjust flux control valve.
The regulative mode of flow control valve can be divided into hydraulic control mode and electric control mode, and when adopting the hydraulic control mode, controller can send electrical signal to pilot valve, regulates pressure on the pilot control oil circuit and then the valve core movement of adjust flux control valve by pilot valve; When adopting automatically controlled mode, controller directly sends to electrical signal the control end of flow control valve, and then the valve core movement of adjust flux control valve.
In above-mentioned flow control method, when pressure oil-source comprised variable displacement pump, controller can according to the displacement signal of the spool of multiple directional control valve, send the discharge capacity regulated signal to variable displacement pump, with the Moderator Variable pump delivery.When the demand volume of system reduces, reduce the variable pump delivery, then flow control valve needs corresponding the reducing of flow of off-load, and then saves system capacity; And can the Moderator Variable pump, multiple directional control valve and flow control valve three's flow matches, more steadily control the action of actuator.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the flow control system of a multiple directional control valve is characterized in that, comprising: pressure oil-source (1), multiple directional control valve (2), flow control valve (3) and controller (4), wherein,
The pressure oil that pressure oil-source (1) provides is connected to the P mouth of described multiple directional control valve (2) by in-line, the T mouth of described multiple directional control valve (2) is communicated with oil circuit, and the working hole of described multiple directional control valve (2) is connected with actuator (7); The filler opening of described flow control valve (3) is communicated with described in-line, and oil outlet is communicated with described oil circuit;
Described controller (4) is connected with described multiple directional control valve (2), described flow control valve (3), described controller (4) can be according to the displacement signal of the spool of described multiple directional control valve (2), regulates described flow control valve (3) and lets out flow to described oil circuit.
2. the flow control system of multiple directional control valve according to claim 1, it is characterized in that, controller (4) obtains the displacement signal of the spool of described multiple directional control valve (2) according to the electrical signal of the valve core movement of every selector valve in the pressure signal on the pilot control oil circuit of every selector valve in the described multiple directional control valve (2) that obtains or the described multiple directional control valve of control (2) that obtains.
3. the flow control system of multiple directional control valve according to claim 1, it is characterized in that, described controller (4) can be according to the displacement signal of the spool of described multiple directional control valve (2), regulate the pressure on the pilot control oil circuit of described flow control valve (3), to regulate described flow control valve (3); Perhaps, described controller (4) can according to the displacement signal of the spool of described multiple directional control valve (2), send electrical signal to described flow control valve (3), to regulate described flow control valve (3).
4. the flow control system of multiple directional control valve according to claim 1, it is characterized in that, at described pressure oil-source (1) when comprising variable displacement pump, described controller (4) can be according to the displacement signal of the spool of described multiple directional control valve (2), send the discharge capacity regulated signal to described variable displacement pump, to regulate described variable pump delivery.
5. the flow control system of each described multiple directional control valve in 4 according to claim 1 is characterized in that, described flow control valve (3) is throttle valve or series flow control valve.
6. the flow control system of each described multiple directional control valve in 4 according to claim 1 is characterized in that, described multiple directional control valve (2) is four-way type multiple directional control valve.
7. the flow control system of multiple directional control valve according to claim 6 is characterized in that, described flow control valve (3) is integrated in the described multiple directional control valve (2).
8. an engineering machinery is characterized in that, comprises the flow control system such as each described multiple directional control valve in the claim 1 to 7.
9. the flow control method of a multiple directional control valve is characterized in that, is used for comprising the hydraulic control system of pressure oil-source, multiple directional control valve, flow control valve and controller, and described flow control valve is arranged in the bypass of described multiple directional control valve, wherein:
Described controller obtains the displacement signal of the spool of described multiple directional control valve;
Described controller generates the control signal of described flow control valve according to the described displacement signal of the spool of described multiple directional control valve;
Regulate the draining flow of described flow control valve according to described control signal.
10. the flow control method of multiple directional control valve according to claim 9 is characterized in that, can obtain the spool aperture of described multiple directional control valve according to the described displacement signal of the spool of described multiple directional control valve; Obtain the traffic demand of actuator according to described spool aperture, according to the total discharge of input and the traffic demand of described actuator, generate the control signal of described flow control valve.
11. the flow control method of multiple directional control valve according to claim 9, it is characterized in that, described controller can be according to the displacement signal of the spool of described multiple directional control valve, regulates the pressure on the pilot control oil circuit of described flow control valve, to regulate described flow control valve; Perhaps, described controller can according to the displacement signal of the spool of described multiple directional control valve, send electrical signal to described flow control valve, to regulate described flow control valve.
12. the flow control method of each described multiple directional control valve in 11 according to claim 9, it is characterized in that, when described pressure oil-source comprises variable displacement pump, described controller can be according to the displacement signal of the spool of described multiple directional control valve, send the discharge capacity regulated signal to described variable displacement pump, to regulate described variable pump delivery.
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| CN104728203B (en) * | 2015-03-26 | 2017-11-07 | 北京煤科天玛自动化科技有限公司 | A kind of electric-hydraulic control reversing valve with internal pressure relief function |
| CN104728493A (en) * | 2015-04-15 | 2015-06-24 | 南通华东油压科技有限公司 | Hydraulic valve body casing for large excavator |
| CN106678111A (en) * | 2015-11-06 | 2017-05-17 | 中国航空工业第六八研究所 | Electrically-controlled multi-way valve |
| CN106050769A (en) * | 2016-08-08 | 2016-10-26 | 湖南星邦重工有限公司 | Lifting platform and hydraulic driving system thereof |
| CN106495002B (en) * | 2016-10-28 | 2017-11-21 | 三一帕尔菲格特种车辆装备有限公司 | Accelerator linkage mechanism and lorry-mounted crane |
| CN106837907A (en) * | 2017-01-20 | 2017-06-13 | 雷沃重工股份有限公司 | Multiple directional control valve |
| US11214940B2 (en) | 2018-03-28 | 2022-01-04 | Hitachi Construction Machinery Tierra Co., Ltd. | Hydraulic drive system for construction machine |
| CN112360847B (en) * | 2020-11-05 | 2022-04-08 | 中联重科股份有限公司 | Engineering machinery hydraulic control system and engineering machinery |
| CN113349039A (en) * | 2021-07-09 | 2021-09-07 | 王述海 | Agricultural watering device |
| CN115076190A (en) * | 2022-07-20 | 2022-09-20 | 天津轩禾农业机械制造有限公司 | Round baler hydraulic system and round baler |
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| CN2591305Y (en) * | 2002-12-10 | 2003-12-10 | 江苏省机电研究所有限公司 | Hydraulic control system for high-altitude operation car |
| DE102007059491B3 (en) * | 2007-12-11 | 2009-07-09 | Sauer-Danfoss Gmbh & Co Ohg | Method and circuit arrangement for the pressure medium supply of at least two hydraulic consumers |
| CN201110397Y (en) * | 2007-12-21 | 2008-09-03 | 戴豫 | Dynamic load sensing priority type multichannel conversion valve |
| JP5079827B2 (en) * | 2010-02-10 | 2012-11-21 | 日立建機株式会社 | Hydraulic drive device for hydraulic excavator |
| CN102182730A (en) * | 2011-05-05 | 2011-09-14 | 四川省成都普什机电技术研究有限公司 | Movable arm flow re-generation system with potential energy recovery device for excavator |
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