CN102734247A - 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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- CN102734247A CN102734247A CN2012102436995A CN201210243699A CN102734247A CN 102734247 A CN102734247 A CN 102734247A CN 2012102436995 A CN2012102436995 A CN 2012102436995A CN 201210243699 A CN201210243699 A CN 201210243699A CN 102734247 A CN102734247 A CN 102734247A
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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,, use the engineering machinery of the flow control system of above-mentioned multiple directional control valve in particular to a kind of flow control system and controlling method of multiple directional control valve.
Background technique
In the engineering machinery, adopt multiple directional control valve to control the action of many actuators usually, 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 logical type multiple directional control valve and four-way type multiple directional control valves at present, owing to receive the restriction of multiple directional control valve flow control mode, often can not satisfy above-mentioned requirements simultaneously.
Six logical type multiple directional control valves as shown in Figure 1, when spool was in meta, the pressure oil of multiple directional control valve joined the direct oil sump tank of meta oil duct of selector valve through each; In the spool moving process, the meta oil duct is closed gradually, and the flow that gets into actuator increases gradually; Thereby actuator starts steadily nothing impact; But the loss of meta choke pressure is big, and the couplet number of selector valve is many more, and the choke pressure loss is big more; Therefore cause the hydraulic system pressure loss big, heating value is big.
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, and partial pressure oil is flowed through and produced pressure difference when damping hole B on the unloading valve A gets into control access C, makes 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 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 couplet 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 bigger; Spool does not possess the fine setting characteristic basically, therefore causes system's operation not steady, and speed adjusting performance is poor.
Therefore, how a kind of flow control system of multiple directional control valve is provided, 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 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, impacts little and system pressure loses 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 said multiple directional control valve through in-line; The T mouth of said multiple directional control valve is communicated with oil circuit, and the working hole of said multiple directional control valve is connected with actuator; The filler opening of said flow control valve is communicated with said in-line, and oil outlet is communicated with said oil circuit; Said controller is connected with multiple directional control valve with said flow control valve respectively, and said controller can be regulated said flow control valve and let out the flow to said oil circuit according to the displacement signal of the spool of said multiple directional control valve.
According to the flow control system of multiple directional control valve of the present invention, controller is regulated the displacement of the spool of flow control valve according to the displacement signal of the spool of multiple directional control valve, lets out the flow to said oil circuit thereby regulate flow control valve; In this flow control system; Let out flow through regulating flow control valve to said oil circuit; With the flow through flow of this multiple directional control valve of adjusting; Thereby control gets into 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 technique scheme; Preferably; Controller obtains the displacement signal of the spool of said multiple directional control valve according to the electrical signal of the valve core movement of every selector valve in pressure signal on guide's control oil channel of every selector valve in the said multiple directional control valve that obtains or the said multiple directional control valve of control that obtains.
When said multiple directional control valve is pilot operated directional control valve, can comprise pressure transducer, be arranged on guide's control oil channel of every selector valve in the said multiple directional control valve, be used to gather the pressure signal on said guide's control oil channel; Said controller obtains the displacement signal of the spool of said multiple directional control valve according to the pressure signal of said pressure transducer collection.Can adopt guide's control oil channel to control the motion of the spool of every selector valve in the multiple directional control valve; Utilize pressure transducer to gather the pressure signal on this guide's control oil channel; Just can obtain the displacement signal of every selector valve according to the pressure signal of gathering through corresponding conversion relation, this mode is to obtain a kind of optimal way of displacement signal of the spool of every selector valve.
When said multiple directional control valve was electric control reversing valve, said controller obtained the displacement signal of the spool of said multiple directional control valve according to the electrical signal of the valve core movement of the said multiple directional control valve of control.Adopt electrical signal to control the valve core movement of multiple directional control valve, controller can obtain the displacement signal of spool according to this electrical signal, 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 the valve core movement of said multiple directional control valve through actuation member; Said actuation member is used for controlling instruction to said controller transmission; Said controller is controlled the electrical signal that instruction generates the valve core movement of the said multiple directional control valve of control according to said, with the motion of the spool of controlling said 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 said multiple directional control valve.
In above-mentioned arbitrary technological scheme, preferably, can also comprise displacement transducer, be arranged on every selector valve of said multiple directional control valve, be used to obtain the displacement signal of the spool of said multiple directional control valve.Can directly obtain the displacement signal of the spool of multiple directional control valve through 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, said controller can be according to the displacement signal of the spool of said multiple directional control valve, regulates the pressure on guide's control oil channel of said flow control valve, to regulate said flow control valve; Perhaps, said controller can send electrical signal to said flow control valve, to regulate said flow control valve according to the displacement signal of the spool of said multiple directional 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 the pressure on guide's control oil channel by pilot valve, and then regulates the valve core movement of flow control valve; When adopting automatically controlled mode, controller directly sends to electrical signal the control end of flow control valve, and then regulates the valve core movement of flow control valve.
In above-mentioned arbitrary technological scheme, preferably, when said pressure oil-source comprised variable displacement pump, said controller can send the discharge capacity regulated signal to said variable displacement pump, to regulate said variable pump delivery according to the displacement signal of the spool of said multiple directional control valve.
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 practices thrift system capacity; And can the Moderator Variable pump, multiple directional control valve and flow control valve three's flow matches, the more steadily action of control executing mechanism.
In above-mentioned arbitrary technological scheme, preferably, said flow control valve is throttle valve or series flow control valve.
In above-mentioned arbitrary technological scheme, preferably, said multiple directional control valve is a 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 be controlled the flow that gets into actuator, operates 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, said flow control valve is integrated in the said multiple directional control valve.
According to another aspect of the invention, a kind of engineering machinery is provided also, has comprised flow control system like 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 to comprise the hydraulic control system of multiple directional control valve, flow control valve and controller; Said flow control valve is arranged in the bypass of said multiple directional control valve, wherein: said controller obtains the displacement signal of the spool of said multiple directional control valve; Said controller generates the control signal of said flow control valve according to the said displacement signal of the spool of said multiple directional control valve; Regulate the draining flow of said flow control valve according to said control signal.
According to the flow control system of multiple directional control valve of the present invention, controller is regulated the displacement of the spool of flow control valve according to the displacement signal of the spool of multiple directional control valve, lets out the flow to said oil circuit thereby regulate flow control valve; In this flow control system; Let out flow through regulating flow control valve to said oil circuit; With the flow through flow of this multiple directional control valve of adjusting; Thereby control gets into 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 above-mentioned arbitrary technological scheme, preferably, can obtain the spool aperture of said multiple directional control valve according to the said displacement signal of the spool of said multiple directional control valve; Obtain the traffic demand of said actuator according to said spool aperture,, generate the control signal of said flow control valve according to the total discharge of input and the traffic demand of said actuator.
In above-mentioned arbitrary technological scheme, preferably, said controller can be according to the displacement signal of the spool of said multiple directional control valve, regulates the pressure on guide's control oil channel of said flow control valve, to regulate said flow control valve; Perhaps said controller can send electrical signal to said flow control valve, to regulate said flow control valve according to the displacement signal of the spool of said multiple directional 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 the pressure on guide's control oil channel by pilot valve, and then regulate the valve core movement of flow control valve; When adopting automatically controlled mode, controller directly sends to electrical signal the control end of flow control valve, and then regulates the valve core movement of flow control valve.
In above-mentioned arbitrary technological scheme, preferably, when said pressure oil-source comprised variable displacement pump, said controller can send the discharge capacity regulated signal to said variable displacement pump, to regulate said variable pump delivery according to the displacement signal of the spool of said multiple directional control valve.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 practices thrift system capacity; And can the Moderator Variable pump, multiple directional control valve and flow control valve three's flow matches, the more steadily action of control executing mechanism.
Description of drawings
Fig. 1 is the structural representation of six logical type 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 the flow control system of a kind of multiple directional control valve among the present invention;
Fig. 4 is the schematic representation of the flow control system of multiple directional control valve in the first embodiment of the invention;
Fig. 5 is the schematic representation of the flow control system of multiple directional control valve in the second embodiment of the invention;
Fig. 6 is the schematic representation of the flow control system of multiple directional control valve in the third embodiment of the invention.
Embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, the present invention is further described in detail below in conjunction with accompanying drawing and embodiment.
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 through 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 said flow control valve 3 is communicated with said in-line, and oil outlet is communicated with said oil circuit; Said controller 4 is connected with said multiple directional control valve 2, said flow control valve 3, and said controller 4 can be regulated said flow control valve 3 and let out the flow to said oil circuit according to the displacement signal of the spool of said multiple directional control valve 2.
According to the flow control system of multiple directional control valve of the present invention, controller is regulated the displacement of the spool of flow control valve according to the displacement signal of the spool of multiple directional control valve, lets out the flow to oil circuit thereby regulate flow control valve; In this flow control system; Let out flow through regulating flow control valve to oil circuit; With the flow through flow of this multiple directional control valve of adjusting; Thereby control gets into 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 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 guide's control oil channel 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; At multiple directional control valve 2 is electric control reversing valve, and 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 a metering pump; Pressure oil-source 1 among Fig. 5 and Fig. 6 is a variable displacement pump, and 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 through in-line, and relief valve 5 is set on in-line; 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 corresponding actuator's action respectively, and actuator can be 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 a pilot operated directional control valve, adopts guide's control oil channel to control the motion of the spool of every selector valve, for the displacement of the spool that obtains multiple directional control valve; On guide's control oil channel of every selector valve, pressure transducer 6 is set, is used to gather the pressure signal on guide's control oil channel; For example; Correspondence is provided with two pressure transducers on guide's control oil channel of every selector valve; On guide's control oil channel of selector valve 21, a pressure transducer is used to detect the pressure signal that the guide controls oily XA1, and another pressure transducer is used to detect the pressure signal that the guide controls oily XB2; Pressure signal in the multiple directional control valve that controller 4 collects according to pressure transducer 6 on guide's control oil channel 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 the pressure signal on guide's control oil channel of every selector valve; Just can obtain the displacement signal of the spool of every selector valve according to the pressure signal of gathering through 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 an electric control reversing valve; Through the valve core movement of 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 through the actuation member input; For example, actuation member is a remote control handle, and remote control handle sends to controller 4 according to user's operation and controls instruction; Controller 4 is according to controlling the electrical signal that instruction generates the valve core movement of 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 described in the above content; Obtain the displacement signal of the spool of multiple directional control valve 2 indirectly through the pressure on the collection guide control oil channel or according to the electrical signal of the valve core movement of every selector valve in the control multiple directional control valve; In practical application, can also on every selector valve of multiple directional control valve 2, displacement transducer be set, adopt this displacement transducer directly to obtain the displacement signal of the spool of multiple directional control valve 2; Can directly obtain the displacement signal of the spool of multiple directional control valve like this, need not other elements and change through displacement transducer.
In the specific embodiment of the invention; Controller 4 is regulated flow control valve 3 and is let out the flow to oil circuit, in actual application according to the displacement signal of the spool of multiple directional control valve 2; 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, and the pilot valve on guide's control oil channel sends electrical signal, and then regulates the pressure on guide's control oil channel of flow control valve 3 through pilot valve; With adjusting flow control valve 3, thus the dredge oil amount of control flow rate 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, regulating flow control valve 3, thus the dredge oil amount of control flow rate 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, and 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, can flow control valve 3 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 executing mechanism; 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 of flow control valve 3.
The fine setting performance of multiple directional control valve is that control characteristic is made in fine motion, i.e. the small action of control executing mechanism reposefully when the spool of selector valve is in small aperture.Normally; Existing multiple directional control valve only carries out fine motion through the small aperture of the throttling groove that is provided with on the spool to be regulated; And in flow control system of the present invention; Except the throttling groove through change-over valve core carries out fine motion do to regulate, the throttling action in the time of can also being in small aperture through flow control valve is carried out fine motion and is regulated, and has promptly taked entrance throttle governing circuit (variable displacement pump) and two kinds of compound modes of bypass throttle grverning (flow control valve) to finely tune simultaneously; 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, and the flow control system of this four-way type multiple directional control valve; Can steadily control the flow that gets into actuator; To guarantee that actuator operates steadily, impact little and the 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 the flow control system of multiple directional control valve, selector valve 21 is in running order following in multiple directional control valve 2 in Fig. 4; If controlling spool and the pressure that oily XA1 acts on selector valve 21, the guide rises gradually; Then the spool aperture of selector valve 1 slowly increases, and pressure transducer 6 detects the pressure signal that the guide controls oily XA1, and 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 rate control valve 3 slowly reduces, and makes pressure oil reposefully through in the selector valve 21 entering actuators, guarantees that actuator starts the steady impact of not having; 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 with 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 of spool and flow control valve 3 that respectively joins selector valve 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 the guide controls oily XA1 and XA2 works.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, promptly the guide of the spool of selector valve 21 guide that controls the spool of oily XA1 and selector valve 22 to control the force value of oily XA2 be variation constantly.
Pressure transducer 6 is gathered the pressure signal that the guide controls oily XA1 and XA2 in real time; Controller 4 can obtain the displacement signal of the spool of current every selector valve according to this pressure signal; 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 rate 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 confirm the passage section area of the orifice of selector valve, the flow general formula can obtain the traffic demand of actuator then:
Q=CArΔP
Ψ，
Wherein, Q is the flow of selector valve; C is the coefficient by the shape of orifice, size and liquid property decision; Ar is the passage section area of selector valve orifice, and 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), and Ψ has the index of the slenderness ratio decision of orifice; 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.
Through the aforementioned calculation process, obtain the demand volume of selector valve 21 and selector valve 22 corresponding actuators, 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 regulated flow control valve 3 according to the displacement signal of the spool of multiple directional control valve, has realized the function of the off-load flow of dynamic control flow rate controller 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 are 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 to comprise 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, the draining flow according to control signal adjusting flow control valve makes the flow of the multiple directional control valve of flowing through satisfy the traffic demand of actuator.
Therefore; According to the flow control system of multiple directional control valve of the present invention, controller is regulated the displacement of the spool of flow control valve according to the displacement signal of the spool of multiple directional control valve, lets out the flow to oil circuit through regulating flow control valve; With the flow through flow of this multiple directional control valve of adjusting; Thereby control gets into 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 multiple mode:
In multiple directional control valve, on guide's control oil channel of every selector valve pressure transducer is set, pressure transducer is gathered the pressure signal on guide's control oil channel; 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 and control instruction to controller, controller is according to controlling the electrical signal that instruction generates the valve core movement of 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 of multiple directional control valve is provided with displacement transducer, and controller obtains the displacement signal of the spool of multiple directional control valve through 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; According to the traffic demand of spool aperture acquisition actuator,, generate the control signal of flow control valve according to the total discharge of input and the traffic demand of actuator.
In concrete the application; Displacement according to spool can be confirmed the spool aperture, and the spool aperture is associated with the passage section area, therefore; After confirming 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 the control signal of generation flow control valve is to regulate flow control valve 3; Thereby make pressure oil reposefully through in the selector valve entering actuator, guarantee that actuator starts the steady impact of not having.
In step S3, controller can be according to the displacement signal of the spool of multiple directional control valve, regulates the pressure on guide's control oil channel of flow control valve, to regulate flow control valve; Perhaps controller can send electrical signal to flow control valve according to the displacement signal of the spool of multiple directional control valve, to regulate flow 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 the pressure on guide's control oil channel by pilot valve, and then regulates the valve core movement of flow control valve; When adopting automatically controlled mode, controller directly sends to electrical signal the control end of flow control valve, and then regulates the valve core movement of flow control valve.
In above-mentioned flow control method, when pressure oil-source comprised variable displacement pump, controller can send the discharge capacity regulated signal to variable displacement pump, with the Moderator Variable pump delivery according to the displacement signal of the spool of multiple directional control valve.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 practices thrift system capacity; And can the Moderator Variable pump, multiple directional control valve and flow control valve three's flow matches, the more steadily action of control executing mechanism.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, 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 said multiple directional control valve (2) through in-line, and the T mouth of said multiple directional control valve (2) is communicated with oil circuit, and the working hole of said multiple directional control valve (2) is connected with actuator (7); The filler opening of said flow control valve (3) is communicated with said in-line, and oil outlet is communicated with said oil circuit;
Said controller (4) is connected with said multiple directional control valve (2), said flow control valve (3); Said controller (4) can be regulated said flow control valve (3) and let out the flow to said oil circuit according to the displacement signal of the spool of said multiple directional control valve (2).
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 said multiple directional control valve (2) according to the electrical signal of the valve core movement of every selector valve in pressure signal on guide's control oil channel of every selector valve in the said multiple directional control valve (2) that obtains or the said 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; Said controller (4) can be according to the displacement signal of the spool of said multiple directional control valve (2); Regulate the pressure on guide's control oil channel of said flow control valve (3), to regulate said flow control valve (3); Perhaps, said controller (4) can send electrical signal to said flow control valve (3), to regulate said flow control valve (3) according to the displacement signal of the spool of said multiple directional control valve (2).
4. the flow control system of multiple directional control valve according to claim 1; It is characterized in that; At said pressure oil-source (1) when comprising variable displacement pump; Said controller (4) can send the discharge capacity regulated signal to said variable displacement pump, to regulate said variable pump delivery according to the displacement signal of the spool of said multiple directional control valve (2).
5. according to the flow control system of each described multiple directional control valve in the claim 1 to 4, it is characterized in that said flow control valve (3) is throttle valve or series flow control valve.
6. according to the flow control system of each described multiple directional control valve in the claim 1 to 4, it is characterized in that said multiple directional control valve (2) is a 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, said flow control valve (3) is integrated in the said multiple directional control valve (2).
8. an engineering machinery is characterized in that, comprises the flow control system like 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 to comprise the hydraulic control system of pressure oil-source, multiple directional control valve, flow control valve and controller, and said flow control valve is arranged in the bypass of said multiple directional control valve, wherein:
Said controller obtains the displacement signal of the spool of said multiple directional control valve;
Said controller generates the control signal of said flow control valve according to the said displacement signal of the spool of said multiple directional control valve;
Regulate the draining flow of said flow control valve according to said 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 said multiple directional control valve according to the said displacement signal of the spool of said multiple directional control valve; Obtain the traffic demand of said actuator according to said spool aperture,, generate the control signal of said flow control valve according to the total discharge of input and the traffic demand of said actuator.
11. the flow control method of multiple directional control valve according to claim 9; It is characterized in that; Said controller can be according to the displacement signal of the spool of said multiple directional control valve, regulates the pressure on guide's control oil channel of said flow control valve, to regulate said flow control valve; Perhaps, said controller can send electrical signal to said flow control valve, to regulate said flow control valve according to the displacement signal of the spool of said multiple directional control valve.
12. flow control method according to each described multiple directional control valve in the claim 9 to 11; It is characterized in that; When said pressure oil-source comprises variable displacement pump; Said controller can send the discharge capacity regulated signal to said variable displacement pump, to regulate said variable pump delivery according to the displacement signal of the spool of said multiple directional control valve.
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