CN105201933A - Rotating speed feedback based proportional speed-regulating hydraulic system - Google Patents
Rotating speed feedback based proportional speed-regulating hydraulic system Download PDFInfo
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- CN105201933A CN105201933A CN201510021368.0A CN201510021368A CN105201933A CN 105201933 A CN105201933 A CN 105201933A CN 201510021368 A CN201510021368 A CN 201510021368A CN 105201933 A CN105201933 A CN 105201933A
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Abstract
The invention relates to a rotating speed feedback based proportional speed-regulating hydraulic system. The rotating speed feedback based proportional speed-regulating hydraulic system comprises a flow divider valve, an oil tank, a main oil pump, a pilot pump and a pilot operated proportional-directional valve for conducting reversing on an executing component, wherein the flow divider valve comprises a valve body provided with an oil inlet, an oil outlet, a control port and a load feedback port, the control port receives an external control signal and changes along with change of the external control signal, the oil inlet is communicated with an outlet of the main oil pump, the oil outlet is communicated with the oil tank, the control port is communicated with an outlet of the pilot pump, the load feedback port is communicated with a working oil port of the pilot operated proportional-directional valve, and the main oil pump and the pilot pump output power through the same output shaft to enable the pilot pump to reflect rotating speed change of an engine providing power for the main oil pump and the pilot pump. The speed regulating performance of the rotating speed feedback based proportional speed-regulating hydraulic system is improved by adopting the flow divider valve with control pressure changing along with rotating speed change of the engine, and consistency of the speed regulating performance under the two conditions of high speed and low speed of the engine can be achieved.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of proportionality velocity modulation hydraulic system based on speed feedback.
Background technique
The pressure differential deltap P that the proportionality velocity modulation hydraulic system that existing construction machinery industry adopts mainly relies on diverter valve to set before and after main valve is invariable, is then realized the speed adjusting performance of system by the openings of sizes of adjustment main valve valve rod.Pressure differential deltap P constant magnitude before and after this hydraulic system main valve is constant, and the speed adjusting performance of hydraulic system decides primarily of the flow of system and the openings of sizes of primary valve.
As shown in Figure 1, be the control principle drawing of diverter valve in prior art, the hydraulic oil provided by oil hydraulic pump a1 is by primary valve a2 to load a4 fuel feeding, and diverter valve a3 is connected in parallel on working connection.This diverter valve a3 is applied to the structural representation of proportionality velocity modulation hydraulic system see Fig. 2, this system mainly adopts oil hydraulic pump a1 overflow-type regulative mode in parallel, diverter valve a3 is wherein constant for ensureing the pressure reduction before and after primary valve a2, this system mainly relies on the opening area of control bound mouth a2 to carry out the flow of regulating system, thus realizes the speed adjusting performance of system.
The speed adjusting performance of this system is comparatively large by the impact of engine speed, because the setting pressure of the pressure reduction before and after primary valve primarily of diverter valve spring chamber determines, so the speed adjusting performance of this hydraulic system determines primarily of the openings of sizes of primary valve.The area formula of restriction is flowed through according to fluid
known, at C
1, Δ P invariable when, the flow flowing through system determines primarily of the opening area of primary valve, and the opening area of primary valve is mainly determined by the displacement amount of valve rod, the displacement amount of valve rod is larger within the specific limits, and the opening area of primary valve is also larger.Therefore, when before and after primary valve, pressure reduction is constant, when low speed small flow, can meet the traffic requirement that pump is discharged when primary valve opening area is less, speed adjusting performance is poor; When large discharge, can meet the traffic requirement that pump is discharged when primary valve opening area is larger, speed adjusting performance is better.
In existing hydraulic system, the setting value of Δ P determines the speed adjusting performance of system.When the Δ P setting value of system is less, motor is under speed operation, and system is by when compared with small flow, and main valve valve rod can ensure by the area increasing restriction the flow that system is passed through, and system speed adjusting performance is better; But motor is under high-speed working condition, system is by when compared with large discharge, and main valve valve rod can not ensure certainly will cause increasing of system pressure like this by the flow that system is passed through by unconfined increase area, the stability of influential system, reduces the efficiency of system; Otherwise when the Δ P setting value of system is larger, motor is under speed operation, and main valve valve rod can meet the requirement of flow system flow when very little opening, the adjustable extent of opening is less, and the speed adjusting performance of system is poor; Motor is under high-speed working condition, and the flow that system is passed through is comparatively large, and main valve valve rod can meet the requirement of flow needed for system by open, the good speed adjustment features of system.
In sum, proportionality velocity modulation hydraulic system Problems existing of the prior art is mainly:
(1) speed adjusting performance conformity is poor: the pressure differential deltap P of existing system is invariable, the area of passage of main valve valve rod does not change with the change of flow system flow, the speed regulating section of system is only relevant with the flow of system, therefore the speed regulating section of system has larger difference under low engine speed and high speed, its speed adjusting performance is comparatively large by the impact of engine speed, cannot ensure the conformity of speed adjusting performance.
(2) energy loss is large: when existing system motor is standby, system still has certain pressure, and all flow of system all flows back to fuel tank from diverter valve restriction, under this operating mode, motor still has certain power stage, and the energy loss of system is larger.
(3) system heat yield is high: existing system is under operating mode awaited orders by motor, the flow of system flows back to fuel tank by diverter valve restriction and can produce certain heat, cause the thermal equilibrium temperature of system too high, certain impact is all produced on the performance and used life of hydraulic element.
Summary of the invention
The object of the invention is to propose a kind of proportionality velocity modulation hydraulic system based on speed feedback, better speed adjusting performance can be obtained, the condition of improvement system speed adjusting performance is provided.
For achieving the above object, the invention provides a kind of proportionality velocity modulation hydraulic system based on speed feedback, comprise diverter valve, fuel tank, main oil pump, pioneer pump and the liquid controlled reversing Proportional valve for commutating to executive component, wherein said diverter valve comprises valve body, described valve body is provided with filler opening, oil outlet, control mouth and load feedback mouth, described control mouth receives external control signal, and change with the change of described external control signal, the outlet of described filler opening and described main oil pump, described oil outlet is communicated with described fuel tank, the outlet of described control mouth and described pioneer pump, described load feedback mouth is communicated with an actuator port of described liquid controlled reversing Proportional valve, described main oil pump and described pioneer pump are by same output shaft outputting power, the change that described main oil pump and described pioneer pump provide the engine speed of power is reflected as to make described pioneer pump.
Further, described diverter valve also comprises valve rod, spring, First Transition block and end cap, wherein said valve rod is positioned at the inside of described valve body, described end cap is arranged on one end of described valve body, described end cap has hollow structure, described First Transition block is installed in the hollow structure of described end cap, described First Transition block will by described end cap, the chamber that described valve body and described valve rod surround is divided into separate pilot control cavity volume and spring chamber, described First Transition block and described end cap form described pilot control cavity volume, the outlet formation control mouth of the hollow structure of described end cap, described control mouth receives external control signal, and change with the change of described external control signal, described First Transition block, described end cap, described valve body and described valve rod form described spring chamber jointly, described spring is arranged in described spring chamber, and be arranged on described valve rod, described First Transition block comprises hollow structure, the termination of described valve stem end can be inserted in the hollow structure of described First Transition block, described valve rod can relative to described First Transition block motion, described valve body is provided with filler opening and oil outlet, described valve rod is provided with load feedback mouth, the pressure of described load feedback mouth enters described spring chamber by the load feedback oil duct be arranged in described valve rod.
Further, described diverter valve also comprises the one-way valve be arranged in described termination, the import of described one-way valve is communicated with described pilot control cavity volume, the outlet of described one-way valve is communicated with described load feedback mouth, and the pressure of described pilot control cavity volume carries out off-load by described one-way valve and described load feedback mouth.
Further, described diverter valve also comprises the first damping be arranged in described termination, and described first damping forms path in the central axis direction of described valve rod, and forms one-way valve structures with the spool of described one-way valve.
Further, described diverter valve also comprises the second transition block, and described second transition block is installed in the hollow structure of described First Transition block, and described second transition block forms path in the central axis direction of described valve rod.
Further, described second transition block can be slided in the hollow structure of described First Transition block, and promotes described stem movement.
Further, described diverter valve also comprises seal ring, is sealed between described First Transition block and described end cap by described seal ring.
Further, described diverter valve also comprises plug, and described plug is arranged on the end of described valve body away from described spring, and described plug, described valve body and described valve rod form right side cavity volume jointly.
Further, described diverter valve also comprises the second damping, described second damping is arranged on described valve rod one end away from described spring, the one end of the path that described second damping is formed in the central axis direction of described valve rod is communicated with described right side cavity volume, and the other end is communicated with described filler opening by the opening that described valve rod is arranged.
Further, described main oil pump and described guide's oil pump are metering pump.
Further, the described proportionality velocity modulation hydraulic system based on speed feedback also comprises pressure reduction control gear, described pressure reduction control gear is connected with described guide's oil pump, described pressure reduction control gear can receive the pressure signal changed with the change of engine speed that described pioneer pump exports, and described pressure signal is sent to described diverter valve.
Further, described pressure reduction control gear is automatic pressure reduction recuperation valve or electric proportional pressure control valve.
Further, the described proportionality velocity modulation hydraulic system based on speed feedback also comprises main relief valve, and the import of described main relief valve and the outlet of described main oil pump, the outlet of described main relief valve is communicated with described fuel tank.
Further, the described proportionality velocity modulation hydraulic system based on speed feedback also comprises equilibrium valve and motor, and described equilibrium valve is communicated with another two actuator ports of described liquid controlled reversing Proportional valve with described motor.
Further, the described proportionality velocity modulation hydraulic system based on speed feedback also comprises secondary relief, the filler opening of described secondary relief is communicated with another actuator port of described liquid controlled reversing Proportional valve, and the oil outlet of described secondary relief is communicated with described fuel tank.
Based on technique scheme, the proportionality velocity modulation hydraulic system based on speed feedback that the present invention proposes, the diverter valve of change by adopting pilot pressure with engine speed change, its speed adjusting performance improves, and can be implemented in the conformity of speed adjusting performance under high engine speeds and low speed two kinds of operating modes.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the control principle drawing of diverter valve in prior art.
Fig. 2 is the structural representation of proportionality velocity modulation hydraulic system in prior art.
Fig. 3 is the structural representation of a diverter valve of the present invention embodiment.
Fig. 4 is the structural representation of the unified embodiment of proportionality velocity modulation hydraulic pressure system that the present invention is based on speed feedback.
Fig. 5 be in Fig. 2 proportionality velocity modulation hydraulic system main valve flow with the change curve of main valve displacement of valve rod.
Fig. 6 be in Fig. 4 embodiment main valve flow with the change curve of main valve displacement of valve rod.
Fig. 7 is that in Fig. 4 embodiment, diverter valve controls mouth pressure curve over time.
In figure: a1-oil hydraulic pump, a2-primary valve, a3-diverter valve, a4-load, 1-diverter valve, 2-valve body, 3-valve rod, 4-spring, 5-spring chamber, 6-filler opening, 7-oil outlet, 8-controls mouth, 9-load feedback mouth, 10-one-way valve, 11-end cap, 12-plug, 13-First Transition block, 14-seal ring, 15-first damping, 16-second damping, 17-second transition block, 18-pilot control chamber, 19-termination, 21-fuel tank, 22-main oil pump, 23-pioneer pump, 24-main valve, the main relief valve of 25-, 26-liquid controlled reversing Proportional valve, 27-secondary relief, 28-equilibrium valve, 29-motor, the automatic pressure reduction recuperation valve of 30-, a-high speed down-off change curve, b-low speed down-off change curve, c-high speed down-off change curve, d-low speed down-off change curve, e-at a high speed lower diverter valve controls mouth pressure, under f-low speed, diverter valve controls mouth pressure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it will be appreciated that, term " " center ", " transverse direction ", " longitudinal direction ", " front ", " afterwards ", " left side ", " right side ", " on ", D score, " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limiting the scope of the invention can not be interpreted as.
In order to the problem that the speed adjusting performance solving existing proportionality velocity modulation hydraulic system is inconsistent, the invention provides a kind of proportionality velocity modulation hydraulic system based on speed feedback, as shown in Figure 4, diverter valve 1 should be comprised based on the proportionality velocity modulation hydraulic system of speed feedback, fuel tank 21, main oil pump 22, pioneer pump 23 and the liquid controlled reversing Proportional valve 26 for commutating to executive component, wherein said diverter valve 1 comprises valve body 2, described valve body 2 is provided with filler opening 6, oil outlet 7, control mouth 8 and load feedback mouth 9, described control mouth 8 receives external control signal, and change with the change of described external control signal, the outlet of described filler opening 6 and described main oil pump 22, described oil outlet 7 is communicated with described fuel tank 21, the outlet of described control mouth 8 and described pioneer pump 23, described load feedback mouth 9 is communicated with an actuator port of described liquid controlled reversing Proportional valve 26, described main oil pump 22 and described pioneer pump 23 are by same output shaft outputting power, the change that described main oil pump 22 and described pioneer pump 23 provide the engine speed of power is reflected as to make described pioneer pump 23.
Proportionality velocity modulation hydraulic system based on speed feedback provided by the invention, by arranging diverter valve, the change pressure signal with the change of engine speed that pioneer pump exports is reflected on the pilot pressure of diverter valve, the pilot pressure of diverter valve changes with the change of engine speed, make system under any rotating speed of motor, main valve all with the proportional increase of displacement of spool, realizes the proportionality velocity modulation of valve control by flow, improves the speed adjusting performance of system.
Below with low engine speed flow for proportionality velocity modulation hydraulic system in comparison diagram 2 under 100L/min and the high speed flow two kinds of operating modes that are 260L/min and the speed adjusting performance of proportionality velocity modulation hydraulic system that the present invention is based on speed feedback:
It should be noted that, above-mentioned low engine speed flow to be 100L/min and high speed flow be 260L/min is just in order to illustrate practical effect of the present invention, and enumerate two examples, do not form limiting the scope of the invention.
Fig. 5 is that in existing proportionality velocity modulation hydraulic system, main valve flow is with the change curve of main valve displacement of valve rod, and curve a is high speed down-off change curve, and curve b is low speed down-off change curve.Fig. 6 is that in the proportionality velocity modulation hydraulic system that the present invention is based on speed feedback, main valve flow is with the change curve of main valve displacement of valve rod, and curve c is high speed down-off change curve, and curve d is low speed down-off change curve.
By known with upper curve, in existing proportionality velocity modulation hydraulic system, main valve pressure differential deltap P is invariable, under low engine speed operating mode, the flow of this system is 100L/min, and the flow of system increases, when stem movement 3mm along with the increase of main valve displacement of valve rod, the area of passage of valve port can meet the flow that system is passed through, namely, under speed operation, the adjustable extent of main valve valve rod is 3mm, and speed adjustable range is less; Under high engine speeds operating mode, the flow of system is 260L/min, now the flow of system is larger, ensure that larger flow flows through, the opening area of main valve valve port should be enough large, from the change curve of Fig. 5, after main valve valve rod moves 8mm, the flow that the opening area of valve port could meet 260L/min passes through, the adjustable extent of main valve is 8mm, and speed adjustable range is comparatively large, and speed adjusting performance is better.Therefore, under motor two kinds of different rotating speeds, the speed regulating section one of existing system is between 0-3mm, one between 0-8mm, the conformity of speed regulating section is poor, and speed adjusting performance is poor, also can cause the problems such as system energy loss is large, system heat yield is higher in addition thus.
And in the proportionality velocity modulation hydraulic system that the present invention is based on speed feedback, when motor is under speed operation, assuming that the flow of system is 100L/min, as shown in Figure 7, now diverter valve controls mouth pressure is 38bar, and the pressure differential deltap P before and after main valve is less, system needs the openings of sizes constantly increasing valve port to ensure the flow that system is passed through, system speed governing is interval at about 9mm, and therefore good speed adjustment features under speed operation, control stability is high.When motor is under high-speed working condition, assuming that the flow of system is 260L/min, as shown in Figure 7, now diverter valve controls mouth pressure is 65bar, and the pressure differential deltap P before and after main valve is relatively large, when main valve stem opening area is identical, because the Δ P of main valve under high-speed working condition is relatively large, also comparatively large by the flow of main valve stem, basically identical under the speed regulating section of the system that can ensure under high-speed working condition and speed operation, the good speed adjustment features of entire system.
As shown in Figure 3, for the structural representation of a diverter valve of the present invention embodiment, this diverter valve 1 comprises valve body 2, valve rod 3, spring 4, First Transition block 13 and end cap 11, wherein said valve rod 3 is positioned at the inside of described valve body 2, described end cap 11 is arranged on one end of described valve body 2, described end cap 11 has hollow structure, described First Transition block 13 is installed in the hollow structure of described end cap 11, described First Transition block 13 will by described end cap 11, the chamber that described valve body 2 and described valve rod 3 surround is divided into separate pilot control cavity volume 18 and spring chamber 5, described First Transition block 13 and described end cap 11 form described pilot control cavity volume 18, the outlet formation control mouth 8 of the hollow structure of described end cap 11, described control mouth 8 receives external control signal, and change with the change of described external control signal, described First Transition block 13, described end cap 11, described valve body 2 and described valve rod 3 form described spring chamber 5 jointly, described spring 4 is arranged in described spring chamber 5, and be arranged on described valve rod 3, described First Transition block 13 comprises hollow structure, the termination 19 of described valve rod 3 end can be inserted in the hollow structure of described First Transition block 13, described valve rod 3 can move relative to described First Transition block 13, described valve body 2 is provided with filler opening 6 and oil outlet 7, described valve rod 3 is provided with load feedback mouth 9, the pressure of described load feedback mouth 9 enters described spring chamber 5 by the load feedback oil duct be arranged in described valve rod 3.
Wherein, First Transition block is mainly used in bearing spring, spring arranges with in spring chamber, when valve rod is to left movement, the left end of spring can lean on First Transition block, in addition because valve rod is stepped, end portion is thinner, thicker gradually to the right from end portion, so when valve rod moves right, the right-hand member of spring can lean on valve rod.In addition, in the hollow structure of end cap, certain space is also had between First Transition block and control mouth, First Transition block left end cavity volume and end cap form pilot control cavity volume, this pilot control cavity volume is for storing the guide oil of coming in from control mouth, when guide's pilot pressure acquires a certain degree, under the promotion of guide oil, the first damping promotes valve rod and moves right.In addition, termination 19 is not independently parts, and termination 19 is a part for valve rod 3.
This diverter valve mainly relies on and controls the state that mouth pressure, load feedback mouth pressure, initial tension of spring and inlet pressure maintain relative equilibrium.When the system residing for diverter valve does not work, the pressure of load feedback mouth is zero substantially, the pressure of pilot control cavity volume can carry out off-load by load feedback mouth, spring chamber pressure diminishes, valve rod is under inlet pressure effect, overcome initial tension of spring to be moved to the left, thus filler opening is communicated with oil outlet, realize the off-load of whole system; When the system residing for diverter valve is in running order, diverter valve relies on the pressure of load feedback mouth and control mouth to promote valve rod and moves right, thus filler opening is not communicated with oil outlet, system worked well.
Above-mentioned diverter valve is owing to being provided with pilot control cavity volume, this pilot control cavity volume is separated with spring chamber, realize pilot control pressure and load feedback pressure independence separately in diverter valve to control, this spring chamber is communicated with control mouth, the pressure of this spring chamber can change with the change controlling mouth pressure, therefore the pilot pressure at diverter valve two ends can change with the change controlling mouth Received signal strength, therefore this diverter valve can be used in various corresponding hydraulic system, realize the variability of pilot pressure.
In proportionality velocity modulation hydraulic system of the present invention, because the pressure differential deltap P before and after main valve determined primarily of spring force and pilot control power, and the spring in diverter valve of the present invention is soft spring, the pretightening force of spring is less, therefore under proportionality velocity modulation hydraulic system low engine speed, low flow rate condition, it is less that pilot control pressure can be set, is ensured the good speed adjustment features of the flow that system is passed through, system by the area of passage changing main valve valve rod; Under the operating mode of hydraulic system high engine speeds, large discharge, can arrange pilot control pressure relatively large, with consistent under ensureing the speed adjusting performance of system under this operating mode and speed operation, and zone of control is large.As can be seen here, proportionality velocity modulation hydraulic system provided by the invention can overcome the poor problem of speed adjusting performance.
In one embodiment, described diverter valve 1 can also comprise the one-way valve 10 be arranged in described termination 19, the import of described one-way valve 10 is communicated with described pilot control cavity volume 18, the outlet of described one-way valve 10 is communicated with described load feedback mouth 9, and the pressure of described pilot control cavity volume 18 carries out off-load by described one-way valve 10 and described load feedback mouth 9.
The effect of this one-way valve, on the one hand, operationally, one-way valve can prevent the high pressure oil of load feedback mouth from flowing back in pilot control cavity volume to hydraulic system, realizes pilot control pressure and load feedback pilot pressure to the independent control of respective pressure; On the other hand, when hydraulic system does not work, when the pressure of load feedback mouth is zero, diverter valve in the present invention can realize the off-load of pilot control oil, namely, the pressure controlling mouth can carry out off-load by one-way valve and load feedback mouth, ensureing that in hydraulic system, working connection is when carrying out off-load, only need overcome less spring force.
In another embodiment, described diverter valve 1 can also comprise the first damping 15 be arranged in described termination 19, and described first damping 15 forms path in the central axis direction of described valve rod 3, and forms one-way valve structures with the spool of described one-way valve 10.
The form of the first damping and installation position are equipped with a variety of, act on as long as can realize it.Such as, the termination that the first damping can be arranged on valve rod is inner, and valve rod central axis direction forms path, makes from controlling the hydraulic oil of mouth outflow first by the first damping, then enters spring chamber, can be controlled the flow of this control mouth by the first damping.
In one embodiment, described diverter valve 1 can also comprise the second transition block 17, and described second transition block 17 is installed in the hollow structure of described First Transition block 13, and described second transition block 17 forms path in the central axis direction of described valve rod 3.Second transition block forms path in valve rod central axis direction, ensure that the stability of flow.
Preferably, described second transition block 17 can be slided in the hollow structure of described First Transition block 13, and promotes described valve rod 3 and move.Like this, under the effect of guide's pilot pressure, guide oil promotes the second transition block and slides, and the second transition block promotes the first damped motion again, and then promotes stem movement.
In another embodiment, described diverter valve 1 can also comprise seal ring 14, is sealed between described First Transition block 13 and described end cap 11 by described seal ring 14.Seal ring, by First Transition block and end bracket enclosed, ensures that pilot control cavity volume and spring chamber realize respective independence and control.
Preferably, described diverter valve 1 can also comprise plug 12, and described plug 12 is arranged on the end of described valve body 2 away from described spring 4, and described plug 12, described valve body 2 and described valve rod 3 form right side cavity volume jointly.This plug is arranged on the end of valve body, inserts valve rod and is formed closed circuit.
Preferably, described diverter valve 1 can also comprise the second damping 16, described second damping 16 is arranged on described valve rod 3 one end away from described spring 4, the one end of the path that described second damping 16 is formed in the central axis direction of described valve rod 3 is communicated with described right side cavity volume, and the other end is communicated with described filler opening 6 by the opening that described valve rod 3 is arranged.
Second damping also form path in valve rod central axis direction, simultaneously by with the open communication be arranged on valve rod, can control the hydraulic fluid flow rate of diverter valve filler opening, meet the requirement of flow system flow.The path that the hydraulic oil of coming in from filler opening is formed by the second damping, enter right side cavity volume, when the oil pressure of right side cavity volume acquires a certain degree, valve rod is moved to the left.
Preferably, described main oil pump 22 and described guide's oil pump 23 are metering pump.Metering pump is the pump that the Theoretical flowing capacity that often turns is constant, during engine speed change, due to metering pump often to turn discharge capacity constant, its rotational frequency can change thereupon, and therefore this metering pump can reflect the change of engine speed.
In one embodiment, the described proportionality velocity modulation hydraulic system based on speed feedback can also comprise pressure reduction control gear, described pressure reduction control gear is connected with described guide's oil pump 23, described pressure reduction control gear can receive the pressure signal changed with the change of engine speed that described pioneer pump 23 exports, and described pressure signal is sent to described diverter valve 1.
The form of wherein said pressure reduction control gear has a variety of, as long as the rotating speed that can feed back motor is to realize the change that diverter valve controls mouth pressure.Such as this pressure reduction control gear can be automatic pressing difference recuperation valve 30, electric proportional pressure control valve or other control system.
As shown in Figure 4, the action principle of automatic pressure reduction recuperation valve is: when system does not work, and the filler opening of automatic pressure reduction recuperation valve is communicated with fuel tank, and oil outlet is communicated with the control mouth of diverter valve, and owing to not having source pressure, diverter valve controls mouth pressure not to be changed.And when motor is in running order, the spool that pioneer pump delivery pressure promotes automatic pressure reduction recuperation valve moves downward, the working position of automatic pressure reduction recuperation valve slides, the oil pressure of pioneer pump can enter the spring chamber of diverter valve by the actuator port of automatic pressure reduction recuperation valve, because this automatic pressure reduction recuperation valve is slide-valve, the pressure differential deltap P that therefore can realize diverter valve two ends raises with the rising of engine speed, the aperture of primary valve meets the manipulation speed adjusting performance under low engine speed, when engine speed raises, Δ P raises, increased with the increase of primary valve aperture Δ A by the flow of main valve, thus the speed adjusting performance of the system of guarantee does not change by the change of engine speed, realize the conformity of speed adjusting performance.
Preferably, the described proportionality velocity modulation hydraulic system based on speed feedback can also comprise main relief valve 25, the described import of main relief valve 25 and the outlet of described main oil pump 22, and the outlet of described main relief valve 25 is communicated with described fuel tank 21.Main relief valve controls the pressure on system working connection, prevents excessive the impacting of oil pressure and damages oil circuit and related elements.
The described proportionality velocity modulation hydraulic system based on speed feedback can also comprise equilibrium valve 28 and motor 29, and described equilibrium valve 28 is communicated with another two actuator ports of described liquid controlled reversing Proportional valve 26 with described motor 29.Equilibrium valve is for maintaining the working state of motor.
Described based on the proportionality velocity modulation hydraulic system of speed feedback in secondary relief 27 can also be set, the filler opening of described secondary relief 27 is communicated with another actuator port of described liquid controlled reversing Proportional valve 26, and the oil outlet of described secondary relief 27 is communicated with described fuel tank 21.In hydraulic system of the present invention, diverter valve, liquid controlled reversing Proportional valve, main relief valve and secondary relief can be overall as main valve 24, secondary relief, for controlling the pressure between the outlet of liquid controlled reversing Proportional valve with motor, prevents that oil pressure is excessive to be caused hydraulic shock and damage oil circuit and related elements.
The embodiment of the proportionality velocity modulation hydraulic system based on speed feedback provided by the invention at least has following one or more advantage:
(1) speed adjusting performance high conformity: when the area of passage of main valve valve rod is invariable, diverter valve spring chamber pressure changes along with the change of engine speed, and before and after system main valve, pressure differential deltap P synchronously changes along with the change of diverter valve spring chamber pressure.System under slow-speed of revolution small flow before and after main valve pressure differential deltap P relatively little, the speed regulating section of system can maintain larger scope; System under high rotating speed large discharge before and after main valve pressure differential deltap P relatively large, the speed regulating section of system also can maintain larger scope.When rotating speed is different, this system can rely on the size changing Δ P before and after main valve to ensure the conformity of system speed governing, and maintains in a big way.
(2) energy loss is little: when this system engine is standby, and the pressure of system diverter valve hydraulic pressure cavity volume is zero substantially, and the pretightening force of spring chamber is less, because the pressure that system produces determined primarily of the pretightening force of diverter valve spring; The pretightening force of diverter valve spring chamber is less, and the pressure therefore needed for system is relatively little, and motor only needs to export the requirement that less power all can meet system, and the energy loss of system is less.
(3) system heat yield is little: this system is under operating mode awaited orders by motor; system only needs less pressure can overcome diverter valve initial tension of spring; the heat that the flow of system flows back to fuel tank generation by diverter valve restriction is less; the thermal equilibrium temperature of system can be significantly reduced; effectively can protect the performance of hydraulic element, improve working life.
The proportionality velocity modulation hydraulic system based on speed feedback of the present invention's design, the situation of change of mouth pressure can be controlled according to diverter valve under motor different rotating speeds, by regulating the area of passage of pressure reduction before and after main valve and valve rod, realize the conformity of system speed regulating section under different rotating speeds, make the maneuverability pattern of hoist also have obvious improvement in fine motion and controllability.In addition, the present invention just in order to practical effect of the present invention is better described, does not form limiting the scope of the invention to the elaboration of Values in above content.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request of the present invention protection.
Claims (15)
1. the proportionality velocity modulation hydraulic system based on speed feedback, it is characterized in that, comprise diverter valve (1), fuel tank (21), main oil pump (22), pioneer pump (23) and the liquid controlled reversing Proportional valve (26) for commutating to executive component, wherein said diverter valve (1) comprises valve body (2), described valve body (2) is provided with filler opening (6), oil outlet (7), control mouth (8) and load feedback mouth (9), described control mouth (8) receives external control signal, and change with the change of described external control signal, the outlet of described filler opening (6) and described main oil pump (22), described oil outlet (7) is communicated with described fuel tank (21), the outlet of described control mouth (8) and described pioneer pump (23), described load feedback mouth (9) is communicated with an actuator port of described liquid controlled reversing Proportional valve (26), described main oil pump (22) and described pioneer pump (23) are by same output shaft outputting power, the change that described main oil pump (22) and described pioneer pump (23) provide the engine speed of power is reflected as to make described pioneer pump (23).
2. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 1, it is characterized in that, described diverter valve (1) also comprises valve rod (3), spring (4), First Transition block (13) and end cap (11), wherein said valve rod (3) is positioned at the inside of described valve body (2), described end cap (11) is arranged on one end of described valve body (2), described end cap (11) has hollow structure, described First Transition block (13) is installed in the hollow structure of described end cap (11), described First Transition block (13) will by described end cap (11), the chamber that described valve body (2) and described valve rod (3) surround is divided into separate pilot control cavity volume (18) and spring chamber (5), described First Transition block (13) and described end cap (11) form described pilot control cavity volume (18), the outlet formation control mouth (8) of the hollow structure of described end cap (11), described control mouth (8) receives external control signal, and change with the change of described external control signal, described First Transition block (13), described end cap (11), described valve body (2) and described valve rod (3) form described spring chamber (5) jointly, described spring (4) is arranged in described spring chamber (5), and be arranged on described valve rod (3), described First Transition block (13) comprises hollow structure, the termination (19) of described valve rod (3) end can be inserted in the hollow structure of described First Transition block (13), described valve rod (3) can relative to described First Transition block (13) motion, described valve body (2) is provided with filler opening (6) and oil outlet (7), described valve rod (3) is provided with load feedback mouth (9), the pressure of described load feedback mouth (9) enters described spring chamber (5) by the load feedback oil duct be arranged in described valve rod (3).
3. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 2, it is characterized in that, described diverter valve (1) also comprises the one-way valve (10) be arranged in described termination (19), the import of described one-way valve (10) is communicated with described pilot control cavity volume (18), the outlet of described one-way valve (10) is communicated with described load feedback mouth (9), and the pressure of described pilot control cavity volume (18) carries out off-load by described one-way valve (10) and described load feedback mouth (9).
4. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 3, it is characterized in that, described diverter valve (1) also comprises the first damping (15) be arranged in described termination (19), described first damping (15) forms path in the central axis direction of described valve rod (3), and forms one-way valve structures with the spool of described one-way valve (10).
5. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 2, it is characterized in that, described diverter valve (1) also comprises the second transition block (17), described second transition block (17) is installed in the hollow structure of described First Transition block (13), and described second transition block (17) forms path in the central axis direction of described valve rod (3).
6. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 5, it is characterized in that, described second transition block (17) can be slided in the hollow structure of described First Transition block (13), and promotes described valve rod (3) motion.
7. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 2, it is characterized in that, described diverter valve (1) also comprises seal ring (14), is sealed between described First Transition block (13) and described end cap (11) by described seal ring (14).
8. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 2, it is characterized in that, described diverter valve (1) also comprises plug (12), described plug (12) is arranged on the end of described valve body (2) away from described spring (4), and described plug (12), described valve body (2) and described valve rod (3) form right side cavity volume jointly.
9. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 8, it is characterized in that, described diverter valve (1) also comprises the second damping (16), described second damping (16) is arranged on described valve rod (3) one end away from described spring (4), the one end of the path that described second damping (16) is formed in the central axis direction of described valve rod (3) is communicated with described right side cavity volume, and the other end is communicated with described filler opening (6) by the upper opening arranged of described valve rod (3).
10. the proportionality velocity modulation hydraulic system based on speed feedback according to claim 1, is characterized in that, described main oil pump (22) and described guide's oil pump (23) are metering pump.
The 11. proportionality velocity modulation hydraulic systems based on speed feedback according to claim 10, it is characterized in that, the described proportionality velocity modulation hydraulic system based on speed feedback also comprises pressure reduction control gear, described pressure reduction control gear is connected with described guide's oil pump (23), described pressure reduction control gear can receive the pressure signal changed with the change of engine speed that described pioneer pump (23) exports, and described pressure signal is sent to described diverter valve (1).
The 12. proportionality velocity modulation hydraulic systems based on speed feedback according to claim 11, is characterized in that, described pressure reduction control gear is automatic pressure reduction recuperation valve (30) or electric proportional pressure control valve.
The 13. proportionality velocity modulation hydraulic systems based on speed feedback according to claim 12, it is characterized in that, the described proportionality velocity modulation hydraulic system based on speed feedback also comprises main relief valve (25), the import of described main relief valve (25) and the outlet of described main oil pump (22), the outlet of described main relief valve (25) is communicated with described fuel tank (21).
The 14. proportionality velocity modulation hydraulic systems based on speed feedback according to claim 13, it is characterized in that, the described proportionality velocity modulation hydraulic system based on speed feedback also comprises equilibrium valve (28) and motor (29), and described equilibrium valve (28) is communicated with another two actuator ports of described liquid controlled reversing Proportional valve (26) with described motor (29).
The 15. proportionality velocity modulation hydraulic systems based on speed feedback according to claim 14, it is characterized in that, the described proportionality velocity modulation hydraulic system based on speed feedback also comprises secondary relief (27), the filler opening of described secondary relief (27) is communicated with another actuator port of described liquid controlled reversing Proportional valve (26), and the oil outlet of described secondary relief (27) is communicated with described fuel tank (21).
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| CN105201933B (en) | 2017-09-19 |
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