CN104179734B - A kind of constant-pressure control device for hydraulic pump and control method - Google Patents
A kind of constant-pressure control device for hydraulic pump and control method Download PDFInfo
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- CN104179734B CN104179734B CN201410426884.7A CN201410426884A CN104179734B CN 104179734 B CN104179734 B CN 104179734B CN 201410426884 A CN201410426884 A CN 201410426884A CN 104179734 B CN104179734 B CN 104179734B
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Abstract
A kind of constant-pressure control device for hydraulic pump of disclosure and control method.Wherein, fine filter oil-in connects with hydraulic pump oil drain out, fine filter oil-out connects with the rodless cavity of constant-pressure control valve P mouth, little variable piston simultaneously, constant-pressure control valve A mouth connects with damped valve P mouth, constant-pressure control valve T mouth connects with damped valve T mouth and fuel tank simultaneously, constant-pressure control valve is controlled mouth and is connected with constant-pressure control valve P mouth by its internal fixing damping, and damped valve A mouth connects with the rodless cavity of big variable piston；Feedback rod is fixing with little variable piston to be connected, so that when hydraulic pump oil drain out pressure is higher than the proportional spring setting pressure of constant-pressure control valve, feedback rod can move under the drive of little variable piston and contact with damped valve spool and promote valve core movement to connect station to the P mouth of damped valve with T mouth；When the pressure of hydraulic pump oil drain out is lower than the proportional spring setting pressure of constant-pressure control valve, feedback rod can be separated with damped valve spool.
Description
Technical field
The present invention relates to a kind of hydraulic pump constant-pressure control device and control method, belong to technical field of hydraulic.
Background technology
Hydraulic pump is as the core parts of hydraulic system, and the quality of its performance directly affects the overall performance of hydraulic system.Along with the development of hydraulic technique, hydraulic system working pressure is more and more higher, and output flow is increasing, and therefore, the system overload of response speed and stability when tackling to(for) hydraulic pump it is also proposed more stringent requirement.In order to reduce hydraulic pump in the system overload situation of its application, hydraulic pump and hydraulic system element are produced pressure overload infringement, frequently with constant pressure control method, hydraulic pump is carried out overload protection.
The commonly used adjustable proportion amount of spring compression of traditional constant pressure control method has regulated the constant-pressure control valve of pressure regulation power, and coordinate with a fixative resistance, the constant pressure control method of composition C type guide's hydraulic half-bridge mode, the effect improving the stability that hydraulic pump constant voltage regulates process is played in fixative resistance.The program hinders coupling by rational liquid can realize hydraulic system overload protection; but deposit deficiency both ways: first; when hydraulic pump is in overload protection state; existence due to fixative resistance; a part of pilot control hydraulic oil leaks to fuel tank by fixative resistance, it does not have acts on the plunger shaft of variable piston completely and promotes pumpage to reduce, and increases with suppression system pressure; therefore, the response speed that hydraulic pump transships for hydraulic system is weakened by fixative resistance；Secondly, from the angle of pilot control system damping, in conventional c guide's hydraulic half-bridge control mode, the stability of hydraulic pump guide's variable control system and rapidity are by fixing damping restriction, namely when increasing fixing damping, constant voltage regulates process stability to be increased, and it is steady that constant voltage regulates process, but the response speed of hydraulic pump guide's variable control system is slack-off, it is elongated that constant voltage regulates process time, thus causing the infringement of hydraulic pump itself and system element, and reducing fixing damping, effect is contrary.Therefore, there is optimization and room for improvement in the conventional constant voltage control method of this pump.
Summary of the invention
It is an object of the invention to provide a kind of novel constant-pressure control device for hydraulic pump and control method, thus overcoming all or part of defect of prior art.
For achieving the above object, the technical solution used in the present invention is: the present invention includes feedback rod for the constant-pressure control device of hydraulic pump, fine filter, constant-pressure control valve and damped valve, the oil-in of fine filter connects with the oil drain out of hydraulic pump, the oil-out of fine filter simultaneously with the P mouth of constant-pressure control valve, the rodless cavity connection of the little variable piston of hydraulic pump, the A mouth of constant-pressure control valve connects with the P mouth of damped valve, the T mouth of constant-pressure control valve connects with the T mouth of damped valve and outside fuel tank simultaneously, the mouth that controls of constant-pressure control valve is connected with the P mouth of constant-pressure control valve by its internal fixing damping, the A mouth of damped valve connects with the rodless cavity of the big variable piston of hydraulic pump；
Feedback rod is fixing with little variable piston to be connected, so that when the pressure of the oil drain out of hydraulic pump is higher than the proportional spring setting pressure of constant-pressure control valve, feedback rod can move to the spool with damped valve and contacts and promote this valve core movement until the P mouth of this damped valve connects with T mouth under the drive of little variable piston；And when the pressure of oil drain out of hydraulic pump is lower than the proportional spring setting pressure of constant-pressure control valve, feedback rod spool with described damped valve can be separated by little variable piston driving.
Use the method that hydraulic pump is carried out Isobarically Control by the above-mentioned constant-pressure control device of the present invention as follows:
When the pressure of the oil drain out of hydraulic pump is in normal operating conditions lower than the proportional spring setting pressure of constant-pressure control valve, constant-pressure control valve is in the station that its A mouth connects with T mouth, damped valve is in its P mouth and connects station with A mouth, now, from hydraulic pump oil drain out hydraulic oil via fine filter enter little variable piston rodless cavity, meanwhile, the hydraulic oil in the rodless cavity of big variable piston enters the fuel tank of outside sequentially via the A mouth of damped valve, the P mouth of damped valve, the A mouth of constant-pressure control valve, the T mouth of constant-pressure control valve；Now, feedback rod is separated with the spool of damped valve under the drive of little variable piston.
When the pressure of the oil drain out of hydraulic pump enters overload protection state higher than the proportional spring setting pressure of constant-pressure control valve, the station that the Switch of working position that constant-pressure control valve is connected with T mouth by its A mouth connects to its P mouth with A mouth, now, from the hydraulic oil of oil drain out of hydraulic pump via being divided into two-way after fine filter: wherein a road enters the rodless cavity of little variable piston, another road is sequentially via the P mouth of constant-pressure control valve, the A mouth of constant-pressure control valve, the P mouth of damped valve, the A mouth of damped valve and enter the rodless cavity of big variable piston, thus promote big variable piston movement, the swash plate making hydraulic pump moves under the promotion of big variable piston and makes hydraulic pressure pump delivery reduce, thus containing that the pressure of the oil drain out of hydraulic pump raises；And drive little variable piston movement along with the motion of swash plate of hydraulic pump, make feedback rod move to the spool with damped valve under the drive of little variable piston to contact, and promote damped valve valve core movement until this damped valve be in its P mouth simultaneously with A mouth, the station of T mouth connection, now, from the hydraulic oil of oil drain out of hydraulic pump sequentially via fine filter, the P mouth of constant-pressure control valve, the A mouth of constant-pressure control valve, the P mouth of damped valve and be divided into two-way after entering damped valve: wherein a road enter through the T mouth of damped valve outside fuel tank, another road enters the rodless cavity of big variable piston via the A mouth of damped valve, the motion making described big variable piston and described swash plate tapers off, hydraulic pressure pump delivery reduces further, thus containing that the pressure of the oil drain out of hydraulic pump raises and makes hydraulic pump works at pressure constant state further.
When hydraulic pump oil drain out pressure by return to higher than the proportional spring setting pressure of constant-pressure control valve enter hydraulic pump lower than the proportional spring setting pressure of constant-pressure control valve overload protection release state time, the station that the Switch of working position that constant-pressure control valve is connected with A mouth by its P mouth connects to its A mouth with T mouth, damped valve be still within its P mouth simultaneously with A mouth, the station of T mouth connection, hydraulic oil in the rodless cavity of big variable piston is divided into two-way after entering damped valve via the A mouth of damped valve: wherein a road is sequentially via the P mouth of damped valve, the A mouth of constant-pressure control valve, the T mouth of constant-pressure control valve and enter the fuel tank of outside, another road is via the fuel tank outside the T mouth entrance of damped valve, so that described swash plate is moved by big variable piston driving, and then drive little variable piston movement, feedback rod is separated with the spool of damped valve under the drive of little variable piston, with A mouth while of making damped valve by its P mouth, the Switch of working position station that extremely only its P mouth connects with A mouth of T mouth connection, now hydraulic pump recovers to normal operating conditions.
Compared with prior art, it is an advantage of the current invention that:
(1) compared with conventional c guide's hydraulic half-bridge constant pressure control method, the present invention adopts the constant pressure control method of variable-gain A type guide's hydraulic half-bridge.The initial stage that control method of the present invention regulates at overload protection, effect because of the valve core reseting spring of damped valve, damped valve is in station that P mouth connects with A mouth and has maximum slotted density, do not play throttling action, from the hydraulic oil of oil drain out of hydraulic pump successively via the oil-in of fine filter, the oil-out of fine filter, constant-pressure control valve P mouth, constant-pressure control valve A mouth, damped valve P mouth, damped valve A mouth flows into the rodless cavity of big variable piston, this control mode avoids part guide's hydraulic oil in conventional c guide's hydraulic half-bridge control mode and is leaked to fuel tank by fixing damping, and cause response speed to be fixed the problem that damping weakens, therefore, this control mode response speed is than traditional approach faster.
(2) present invention is at overload protection middle and late stage; rapid minimizing along with hydraulic pressure pump delivery; the spool of feedback rod and damped valve comes into contact with, and makes the area of passage between the P mouth of damped valve and A mouth be gradually reduced to fixed value, and the area of passage between P mouth and the T mouth of damped valve is gradually increased；Adaptive damping composition A type guide's hydraulic half-bridge that between adaptive damping and P mouth and the T mouth of damped valve that between P mouth and the A mouth of constant-pressure control valve, variable area of passage is formed, variable area of passage is formed, big variable piston is controlled, therefore along with the continuous minimizing of hydraulic pressure pump delivery, feedback rod promotes the valve core movement of damped valve, orifice size between P mouth and the T mouth of damped valve constantly increases, bypass earial drainage effect is strengthened gradually, the fluid of the rodless cavity flowing into big variable piston constantly reduces, namely control gain to diminish, the movement velocity of the swash plate of big variable piston and hydraulic pump is slack-off gradually, this is possible to prevent the pressure of oil drain out of hydraulic pump to produce pressure fluctuation because pilot control is unstable, therefore, the later stage stability of hydraulic pump pilot control system is more higher than traditional approach.
(3) constant-pressure control device of the present invention is owing to damped valve is just opened by feedback rod when hydraulic pressure pump delivery is less and gets involved conciliation, the time that damped valve is got involved accounts for constant voltage and regulates the time less of process, regulating time can be ignored substantially in whole adjustment process, therefore regulating time is determined by the flow gain of constant-pressure control valve substantially, A type half-bridge stability can be determined by the P mouth of damped valve and T flow area of making a slip of the tongue, therefore, the stability and the rapidity that eliminate pilot control system in traditional control method are subject to the fixing problem arranging restriction mutually damped, make rapidity independent with the setting of stability and can be guaranteed simultaneously.
(4) feedback rod adopts the fixing mode being connected to connect with little variable piston, and directly acts on the spool of damped valve, the valve port opening of damped valve is controlled, it is to avoid the use of sensor, and therefore this constant pressure control system of the present invention is safe and reliable.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram that hydraulic pump is controlled by the constant-pressure control device utilizing the present invention；
Wherein, the big variable piston of 1-, 2-hydraulic pump, the little variable piston of 3-, 4-feedback rod, 5-fine filter, 6-constant-pressure control valve, 7-damped valve, 8-fuel tank, 9-swash plate, the rodless cavity of the little variable piston of 10-, the rodless cavity of the big variable piston of 11-, the oil inlet and outlet of the rodless cavity of the big variable piston of 101-, the oil drain out of 201-hydraulic pump, the oil inlet and outlet of the rodless cavity of the little variable piston of 301-, the control mouth of 601-constant-pressure control valve, the A mouth of 602-constant-pressure control valve, the T mouth of 603-constant-pressure control valve, the P mouth of 604-constant-pressure control valve, the A mouth of 701-damped valve, the P mouth of 702-damped valve, the T mouth of 703-damped valve.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail:
As it is shown in figure 1, the constant-pressure control device that the present invention is used for hydraulic pump 2 includes feedback rod 4, fine filter 5, constant-pressure control valve 6 and damped valve 7, wherein, fine filter 5 acts the effect filtering guide's hydraulic oil.The oil-in of fine filter 5 connects with the oil drain out 201 of hydraulic pump 2, the oil-out of fine filter 5 connects with the rodless cavity 10 of the P mouth 604 of constant-pressure control valve, the little variable piston of hydraulic pump 2 simultaneously, the A mouth 602 of constant-pressure control valve connects with the P mouth 702 of damped valve, the T mouth 603 of constant-pressure control valve connects with the T mouth 703 of damped valve and outside fuel tank 8 simultaneously, the mouth 601 that controls of constant-pressure control valve is connected with the P mouth 604 of constant-pressure control valve by its internal fixing damping, and the A mouth 701 of damped valve connects with the rodless cavity 11 of the big variable piston of hydraulic pump 2.Feedback rod 4 is fixing with little variable piston 3 to be connected so that when the pressure of oil drain out 201 of hydraulic pump is lower than the proportional spring setting pressure of constant-pressure control valve 6, left the spool of damped valve 7 by the motion drive feedback rod 4 of little variable piston 3；And when the pressure of the oil drain out 201 of hydraulic pump is higher than the proportional spring setting pressure of constant-pressure control valve 6, drives feedback rod 4 to move to the spool with damped valve 7 by the motion of little variable piston 3 and contact and promote this valve core movement until the P mouth of this damped valve 7 connects with T mouth.
Constant-pressure control device of the present invention can release state for the overload protection of the normal operating conditions of hydraulic pump 2, the overload protection state of hydraulic pump 2, hydraulic pump 2 and control accordingly.Specific as follows:
Utilizing constant-pressure control device of the present invention, hydraulic pump 2 is carried out in Isobarically Control process, when the pressure of the oil drain out 201 of hydraulic pump makes hydraulic pump 2 be in normal operating conditions lower than the proportional spring setting pressure of constant-pressure control valve 6, constant-pressure control valve control the pressure of hydraulic oil in mouth 601 to the active force of its spool less than active force to its spool of the proportional spring of constant-pressure control valve 6, thus make constant-pressure control valve 6 be in the station that its A mouth connects with T mouth；And the valve core axis of damped valve 7 is limited only by the effect of spring force of its back-moving spring and is in P mouth and connects station with A mouth.Now, enter the rodless cavity 10 of little variable piston via fine filter 5 from the hydraulic oil of oil drain out 201 of hydraulic pump, simultaneously the hydraulic oil in the rodless cavity 11 of big variable piston successively via the A mouth 701 of damped valve, the P mouth 702 of damped valve, the A mouth 602 of constant-pressure control valve, constant-pressure control valve T mouth 603 enter the fuel tank 8 of outside.Owing to the hydraulic oil in the rodless cavity 10 of the little variable piston of hydraulic pump 2 is from the oil drain out P201 of hydraulic pump, and the rodless cavity 11 of the big variable piston of hydraulic pump 2 is in unloading condition, namely the pressure in the rodless cavity 10 of little variable piston is higher than the pressure in the rodless cavity 11 of big variable piston, therefore, big variable piston 1 to the active force of the swash plate 9 of hydraulic pump 2 less than the little variable piston 3 active force to the swash plate 9 of hydraulic pump 2, the swash plate 9 making hydraulic pump 2 moves to the direction that discharge capacity increases, until hydraulic pump 2 is in maximum pump discharge state, now, the motion of little variable piston 3 drives feedback rod 4 to leave the spool of damped valve 7, feedback rod 4 is not contacted with the spool of damped valve 7.
The overload protection stage of hydraulic pump 2 is divided into three periods: respectively regulates the initial stage, regulate mid-term and regulate the later stage.
At the initial stage of adjustment, the pressure of the oil drain out 201 of hydraulic pump enters the overload protection state of hydraulic pump 2 higher than the proportional spring setting pressure of constant-pressure control valve 6, at the pressure of the hydraulic oil controlling mouth 601 place of constant-pressure control valve to the active force of the spool of constant-pressure control valve 6 more than active force to its spool of the proportional spring of constant-pressure control valve 6, the station that the Switch of working position that constant-pressure control valve 6 is connected with T mouth by A mouth connects to P mouth with A mouth, the valve core axis of damped valve 7 is still limited only by the effect of the spring force of the back-moving spring of damped valve 7 and is in P mouth and connects station with A mouth and be shown in a fully open operation.Now, from hydraulic pump oil drain out 201 hydraulic oil successively via the oil-in of fine filter 5, fine filter 5 oil-out after be divided into two-way: wherein a road hydraulic oil is entered the rodless cavity 10 of little variable piston by the oil inlet and outlet 301 of the rodless cavity of little variable piston, and another road hydraulic oil enters the rodless cavity 11 of big variable piston via the P mouth 604 of constant-pressure control valve, the A mouth 602 of constant-pressure control valve, the P mouth 702 of damped valve, the A mouth 701 of damped valve, the oil inlet and outlet 101 of rodless cavity of big variable piston successively.Owing to the pressure in the rodless cavity 11 of the pressure in the rodless cavity 10 of little variable piston and big variable piston is essentially identical, and the size being smaller in size than big variable piston 1 of little variable piston 3, therefore, big variable piston 1 to the active force of the swash plate 9 of hydraulic pump 2 more than the little variable piston 3 swash plate 9 active force to hydraulic pump 2, big variable piston 1 promotes the swash plate 9 of hydraulic pump 2 to the direction motion that discharge capacity reduces, and the discharge capacity of hydraulic pump 2 reduces the pressure of the oil drain out 201 that can contain hydraulic pump and raises.Now; although the discharge capacity of hydraulic pump 2 reduces; but feedback rod 4 is still not in contact with the spool to damped valve 7; therefore; this stage damped valve 7 does not have throttling and the effect of fixing damping shunting, and therefore that the control gain of big variable piston 1 is maximum, the discharge capacity making hydraulic pump 2 is rapidly reduced to less state by this; thus the rising of quick suppression system pressure, protection hydraulic pump 2 and system element.
Regulating mid-term, move along with the swash plate 9 of hydraulic pump 2 and then drive little variable piston 3 to move, the spool that feedback rod 4 moves to damped valve 7 under the drive of little variable piston 3 contacts, and makes area of passage between the P mouth of damped valve 7 and A mouth reduce to fixed value gradually；The flow direction of guide's hydraulic oil is consistent with regulating early stage；But along with between P mouth and the A mouth of damped valve 7, area of passage tapers into, throttling action is strengthened gradually, the control gain of big variable piston 1 is diminished by guide's oil circuit because of throttling action, and the motion of big variable piston 1 and swash plate 9 slows down, and the stability of the Isobarically Control process of hydraulic pump 2 improves.
Phase after adjustment, feedback rod 4 continues motion under the drive of little variable piston 3 and promotes the valve core movement of damped valve 7 to connect with T mouth to the P mouth of damped valve 7, owing to there is fixing damping hole between P mouth 702 and the A mouth 703 of damped valve of damped valve, therefore area of passage no longer changes, and area of passage is gradually increased between the P mouth of damped valve 7 and T mouth, make the hydraulic oil of the oil drain out 201 from hydraulic pump successively via the oil-in of fine filter 5, the oil-out of fine filter 5, the P mouth 604 of constant-pressure control valve, the A mouth 602 of constant-pressure control valve, the P mouth 702 of damped valve is divided into two-way after entering damped valve 7: wherein a road enters the rodless cavity 11 of big variable piston via the A mouth 701 of damped valve, another road enters outside fuel tank 8 through the T mouth 703 of damped valve.Therefore, for the oil inlet and outlet 101 of big variable piston, the adaptive damping that variable area of passage between P mouth 604 and the A mouth 602 of constant-pressure control valve of constant-pressure control valve is formed, and adaptive damping composition A type guide's hydraulic half-bridge that the variable area of passage between the P mouth 702 of damped valve and the T mouth 703 of damped valve is formed.In the process that feedback rod 4 promotes the spool of damped valve 7 constantly to move, owing to the P mouth 702 of damped valve constantly increases with T mouth 703 area of passage of damped valve, damping between the P mouth 702 of damped valve and the T mouth 703 of damped valve is constantly reduced, the fluid being flowed into fuel tank 8 by the T mouth 703 of damped valve is increased gradually, so the fluid of the rodless cavity 11 of the big variable piston of influent press pump 2 gradually decreases, the control gain of big variable piston 1 is reduced further, the motion of the big variable piston 1 of hydraulic pump 2 and the swash plate 9 of hydraulic pump 2 tapers off, the discharge capacity finally making hydraulic pump 2 maintains an only small state, this discharge capacity only maintains the internal leakage flow by T mouth 703 earial drainage of the damped valve flow to fuel tank 8 and hydraulic pump 2, thus thoroughly containing that the pressure of the oil drain out 201 of hydraulic pump 2 raises, fluid pump 2 is thus finally made to be operated in pressure constant state.
In a word; utilizing constant-pressure control device of the present invention to carry out in Isobarically Control process to hydraulic pump, at the adjustment initial stage in overload protection stage, pilot control gain is maximum; thus quickly reducing the discharge capacity of hydraulic pump 2 to less state, reduce system overload to the infringement of element in hydraulic pump 2 and system；Regulating mid-term, the discharge capacity of hydraulic pump 2 reduces further, and hydraulic pump pilot control gain also reduces, and pilot control system stability strengthens gradually；Phase after adjustment; the adaptive damping that variable area of passage between P mouth 604 and the A mouth 602 of constant-pressure control valve of constant-pressure control valve is formed; and adaptive damping composition A type guide's hydraulic half-bridge that the variable area of passage between the P mouth 702 of damped valve and the T mouth 703 of damped valve is formed; the swash plate 9 controlling hydraulic pump 2 is finally reached steady statue, and namely above be that variable-gain A type guide's hydraulic half-bridge overload protection controls process.Because the rapidity that hydraulic pump 2 is controlled by this control method is determined by regulating the initial stage, stability is by regulating mid-term and later stage guarantee, therefore relatively independent at the design aspect controlling rapidity and stability, it is to avoid rapidity and the stability problem by fixing damping restriction in traditional control method.
When hydraulic pump oil drain out 201 pressure by higher than the proportional spring setting pressure of constant-pressure control valve 6 return to lower than constant-pressure control valve 6 proportional spring setting pressure hence into hydraulic pump 2 overload protection release state time, constant-pressure control valve control the pressure of hydraulic oil in mouth 601 to the active force of its spool less than active force to its spool of the proportional spring of constant-pressure control valve 6, the station that the Switch of working position that constant-pressure control valve 6 is connected with A mouth by P mouth connects to A mouth with T mouth, damped valve 7 be still within its P mouth simultaneously with A mouth, the station of T mouth connection, hydraulic oil in the rodless cavity 11 of big variable piston is divided into two-way after entering damped valve 7 via the A mouth 701 of damped valve: wherein a road is successively via the P mouth 702 of damped valve, the A mouth 602 of constant-pressure control valve, the T mouth 603 of constant-pressure control valve enters the fuel tank 8 of outside, another road also enters the fuel tank 8 of outside via the T mouth 703 of damped valve, so that the rodless cavity 11 of the big variable piston of hydraulic pump 2 is in unloading condition.Owing to the hydraulic oil in the rodless cavity 10 of the little variable piston of hydraulic pump 2 is from the oil drain out P201 of hydraulic pump, and the rodless cavity 11 of the big variable piston of hydraulic pump 2 is in unloading condition, namely the pressure in the rodless cavity 10 of little variable piston is higher than the pressure in the rodless cavity 11 of big variable piston, therefore, big variable piston 1 to the active force of the swash plate 9 of hydraulic pump less than the little variable piston 3 active force to the swash plate 9 of hydraulic pump, the swash plate 9 of hydraulic pump moves to the direction that discharge capacity increases, the motion of little variable piston 3 drives feedback rod 4 to leave the spool of damped valve 7, feedback rod 4 progressively disengages contacting of the spool with damped valve 7, with A mouth while that damped valve 7 being by its P mouth, the Switch of working position station that extremely only its P mouth connects with A mouth of T mouth connection, the discharge capacity of hydraulic pump 2 gradually returns to maximum pump discharge state, hydraulic pump 2 recovers to normal operating conditions.
Claims (2)
1. the constant-pressure control device for hydraulic pump, it is characterized in that: include feedback rod (4), fine filter (5), constant-pressure control valve (6) and damped valve (7), the oil-in of fine filter (5) connects with the oil drain out (201) of hydraulic pump, the oil-out of fine filter (5) simultaneously with the P mouth (604) of constant-pressure control valve, rodless cavity (10) connection of the little variable piston of hydraulic pump, the A mouth (602) of constant-pressure control valve connects with the P mouth (702) of damped valve, the T mouth (603) of constant-pressure control valve connects with the T mouth (703) of damped valve and outside fuel tank (8) simultaneously, the control mouth (601) of constant-pressure control valve is connected with the P mouth (604) of constant-pressure control valve by its internal fixing damping, the A mouth (701) of damped valve connects with the rodless cavity (11) of the big variable piston of hydraulic pump；
Feedback rod (4) is fixing with little variable piston (3) to be connected, so that when the pressure of the oil drain out (201) of hydraulic pump is higher than the proportional spring setting pressure of constant-pressure control valve (6), feedback rod (4) can move to the spool with damped valve (7) and contacts and promote this valve core movement until the P mouth of this damped valve (7) connects with T mouth under the drive of little variable piston (3)；And when the pressure of oil drain out (201) of hydraulic pump is lower than the proportional spring setting pressure of constant-pressure control valve (6), feedback rod (4) spool with described damped valve (7) can be separated by little variable piston driving.
2. the method using the device of claim 1 that hydraulic pump is carried out Isobarically Control, is characterized in that:
When the pressure of the oil drain out (201) of hydraulic pump is in normal operating conditions lower than the proportional spring setting pressure of constant-pressure control valve (6), constant-pressure control valve (6) is in the station that its A mouth connects with T mouth, damped valve (7) is in its P mouth and connects station with A mouth, now, enter the rodless cavity (10) of little variable piston via fine filter (5) from the hydraulic oil of oil drain out (201) of hydraulic pump, simultaneously, hydraulic oil in the rodless cavity (11) of big variable piston is sequentially via the A mouth (701) of damped valve, the P mouth (702) of damped valve, the A mouth (602) of constant-pressure control valve, the T mouth (603) of constant-pressure control valve and enter the fuel tank (8) of outside；Now, feedback rod (4) is separated with the spool of damped valve (7) under the drive of little variable piston (3)；
When the pressure of the oil drain out (201) of hydraulic pump enters overload protection state higher than the proportional spring setting pressure of constant-pressure control valve (6), the station that the Switch of working position that constant-pressure control valve (6) is connected with T mouth by its A mouth connects to its P mouth with A mouth, now, hydraulic oil from the oil drain out (201) of hydraulic pump is divided into two-way via after fine filter (5): wherein a road enters the rodless cavity (10) of little variable piston, another road is sequentially via the P mouth (604) of constant-pressure control valve, the A mouth (602) of constant-pressure control valve, the P mouth (702) of damped valve, the A mouth (701) of damped valve and enter the rodless cavity (11) of big variable piston, big variable piston (1) is thus promoted to move, the swash plate (9) making hydraulic pump (2) moves under the promotion of big variable piston (1) and makes the discharge capacity of hydraulic pump (2) reduce, thus containing that the pressure of the oil drain out (201) of hydraulic pump raises；And drive little variable piston (3) to move along with the motion of swash plate (9) of hydraulic pump (2), the spool that feedback rod (4) moves to damped valve (7) under the drive of little variable piston (3) is contacted, and promote damped valve (7) valve core movement until this damped valve (7) be in its P mouth simultaneously with A mouth, the station of T mouth connection, now, from the hydraulic oil of oil drain out (201) of hydraulic pump sequentially via fine filter (5), the P mouth (604) of constant-pressure control valve, the A mouth (602) of constant-pressure control valve, the P mouth (702) of damped valve and be divided into two-way after entering damped valve (7): wherein a road enter through the T mouth (703) of damped valve outside fuel tank (8), another road enters the rodless cavity (11) of big variable piston via the A mouth (701) of damped valve, the motion making described big variable piston (1) and described swash plate (9) tapers off, the discharge capacity of hydraulic pump (2) reduces further, thus containing that the pressure of the oil drain out (201) of hydraulic pump raises and makes hydraulic pump (2) be operated in pressure constant state further；
When hydraulic pump oil drain out (201) pressure by return to higher than the proportional spring setting pressure of constant-pressure control valve (6) enter hydraulic pump (2) lower than the proportional spring setting pressure of constant-pressure control valve (6) overload protection release state time, the station that the Switch of working position that constant-pressure control valve (6) is connected with A mouth by its P mouth connects to its A mouth with T mouth, damped valve (7) be still within its P mouth simultaneously with A mouth, the station of T mouth connection, hydraulic oil in the rodless cavity (11) of big variable piston is divided into two-way after entering damped valve (7) via the A mouth (701) of damped valve: wherein a road is sequentially via the P mouth (702) of damped valve, the A mouth (602) of constant-pressure control valve, the T mouth (603) of constant-pressure control valve and enter the fuel tank (8) of outside, another road is via the fuel tank (8) outside T mouth (703) entrance of damped valve, so that described swash plate (9) is driven by big variable piston (1) and moves, and then drive little variable piston (3) to move, feedback rod (4) is separated with the spool of damped valve (7) under the drive of little variable piston (3), with A mouth while of making damped valve (7) by its P mouth, the Switch of working position station that extremely only its P mouth connects with A mouth of T mouth connection, now hydraulic pump (2) recovers to normal operating conditions.
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| CN201410426884.7A CN104179734B (en) | 2014-08-27 | 2014-08-27 | A kind of constant-pressure control device for hydraulic pump and control method |
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| CN105443488B (en) * | 2016-01-05 | 2017-05-10 | 廖冲雷 | Feedback controller for hydraulic system |
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| CN103527542B (en) * | 2013-10-17 | 2016-05-11 | 三一汽车起重机械有限公司 | variable pump hydraulic circuit and engineering machinery |
| CN203743103U (en) * | 2014-03-19 | 2014-07-30 | 中联重科股份有限公司 | Hydraulic control device, hydraulic system and engineering machinery |
| CN204041575U (en) * | 2014-08-27 | 2014-12-24 | 浙江德泰机电工程有限公司 | A kind of constant-pressure control device for oil hydraulic pump |
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