CN101676589B - Liquid proportional pressure-reducing valve, valve bank, suspension arm and winding hydraulic pressure control system - Google Patents
Liquid proportional pressure-reducing valve, valve bank, suspension arm and winding hydraulic pressure control system Download PDFInfo
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- CN101676589B CN101676589B CN2008102115358A CN200810211535A CN101676589B CN 101676589 B CN101676589 B CN 101676589B CN 2008102115358 A CN2008102115358 A CN 2008102115358A CN 200810211535 A CN200810211535 A CN 200810211535A CN 101676589 B CN101676589 B CN 101676589B
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Abstract
The invention discloses a proportional pressure-reducing valve, a proportional pressure-reducing valve bank, a suspension arm and a winding operation control system. The valve plug of the liquid proportional pressure-reducing valve is in stepped shaft shape and is composed of a minor-diameter section and a major-diameter section; a radial through hole is arranged on the minor-diameter section of the valve plug; an axial through hole which is communicated with the radial through hole is arranged on the external end face of the major-diameter section of the valve plug; the inner cavity of the valve body of the proportional pressure-reducing valve is provided with a minor-diameter section and a major diameter section which are matched with the valve plug in a sliding manner; the side wall ofthe valve body is provided with a first oil inlet, a second oil inlet and oil outlet in turn; the pressure oil which enters by passing the first oil inlet acts on the end face of the valve plug of the minor-diameter section; the pressure oil which enters by passing the second oil inlet acts on the annular stepped surface between the minor-diameter section and the major-diameter section, and flowsout from the oil outlet by passing an oil duct formed by the radial through hole and the axial through hole; the pressure of the first oil inlet is a constant value; and when the pressure of the second oil inlet is more than the constant value, the pressure of the oil outlet changes along with the changes of the pressure of the second oil inlet in a certain proportion.
Description
Technical field
The present invention relates to a kind of proportional pressure-reducing valve, the hydraulic control system that is specifically related to a kind of proportional pressure-reducing valve, has the proportional pressure-reducing valve group of this reduction valve and have the arm and the elevator of this valve group.
Background technique
Now the hoisting arm expansion of telescopic boom hoist and hook lifting (turned round realize by lifting motor) are two independently actions, are controlled respectively by two Joysticks.When arm stretches operation and elevator separately when not moving, because the rope capacity that reel is emitted is fixed, so along with the stretching out or withdraw of arm, the distance of suspension hook and arm head can correspondingly reduce or become greatly, may cause suspension hook and arm head to collide or suspension hook falls earthward.Therefore, in order to eliminate this hidden danger, will operate hoisting arm expansion handle and hook lifting handle simultaneously when handling control; Perhaps carry out hoisting arm expansion when operation, the operator needs the distance of Real Time Observation suspension hook and arm head, collides or falls earthward to avoid suspension hook and arm head, exists the programmed sequence of operations complexity, the problem that efficient is very low.
In view of this, a higher requirement has been proposed for the operation control system of telescopic boom hoist, that is, separately during the handle of operation control hoisting arm expansion, flexible along with arm, the distance of suspension hook and arm head remains unchanged.That is to say, control telescopic oil cylinder and lifting motor action during operation hoisting arm expansion handle simultaneously, and the speed of control elevator becomes certain ratio with the speed of hoisting arm expansion, arm stretches out or when regaining, elevator is put rope or serving action simultaneously in proportion, guarantees that the distance between suspension hook and the arm head remains unchanged.
On the basis of existing hydraulic control system, the main valve aperture that only needs to control two executive components (telescopic oil cylinder and lifting motor) by the reduction valve of pro-rata changes by predetermined ratio, just can realize the designing requirement of two executive component compound motions.The existing proportional pressure-reducing valve of above-mentioned functions of can realizing is electrical signal control, during work, according to the electrical signal of the relationship change of being imported by a certain percentage, realizes that delivery pressure changes according to a certain percentage with the variation of incoming pressure; Because the variation precision of electric proportional pressure-reducing valve delivery pressure value and the precision of input electrical signal have direct relation, when input electrical signal emersion wave movable property was given birth to deviation, its delivery pressure value also can produce deviation thereupon, and therefore, precision is uncontrollable; In addition, if improve the precision of input electrical signal, just need to increase and control cost.
Summary of the invention
At above-mentioned defective, the technical problem that the present invention solves is, but a kind of liquid proportional reduction valve is provided, has the proportional pressure-reducing valve group of this liquid proportional reduction valve and adopts the hoist hydraulic control system of the arm and the elevator compound motion of this proportional pressure-reducing valve group.
Liquid proportional reduction valve provided by the invention comprises valve body and the spool that is arranged in the body cavity, and described spool can slide in body cavity under the effect of pressure oil, and described spool is the multidiameter shaft shape, is made of a path section and big footpath section two-part; Have radial direction through hole on the path section of described spool, have the axial hole that is communicated with described radial direction through hole on the spool exterior edge face of the big footpath of described spool section; And with described spool accordingly, described body cavity has the path section that is slidingly matched with spool and big footpath section; Along the glide direction of described spool, have first filler opening, second filler opening and oil outlet on the sidewall of described valve body successively; Wherein, act on the end face of described path section spool through the pressure oil that described first filler opening enters; On the pressure oil that described second filler opening enters acts on annular table terrace between the section of described path Duan Yuda footpath, and the oil duct that forms via radial direction through hole and axial hole flows out from described oil outlet; The input pressure of described first filler opening is the input pressure of steady state value and described second filler opening during greater than described steady state value, with the variation of the described second filler opening input pressure accordingly, the oil pressure that goes out of described oil outlet is linear change according to the following equation:
P
2＝P
A1·S
1/S
2+P
1·(S
2-S
1)/S
2；
In the formula, P
A1: the first filler opening input pressure; P
1: the second filler opening input pressure; P
2: oil outlet goes out oil pressure; S
1: the radial cross section area of path section spool; S
2: the radial cross section area of big footpath section spool.
Preferably, have return opening on the valve body between described first filler opening and second filler opening;
Work as P
2S
2P
A1S
1+ P
1(S
2-S
1) time, described spool slides under the effect of oil outlet pressure oil, and described return opening is communicated with oil outlet by the axial hole and the radial direction through hole of described spool.
Proportional pressure-reducing valve group provided by the invention comprises a Fixed pressure reducing valve and at least one foregoing liquid proportional reduction valve; The oil outlet of described Fixed pressure reducing valve is communicated with first filler opening of described at least one liquid proportional reduction valve respectively; And described valve group has the first valve group filler opening and at least one valve group oil outlet, and the described first valve group filler opening is communicated with respectively with the filler opening of Fixed pressure reducing valve and second filler opening of described at least one liquid proportional reduction valve; Described at least one valve group oil outlet is communicated with described at least one liquid proportional reduction valve oil outlet respectively.
Described liquid proportional reduction valve and described valve group oil outlet are set to one respectively.
Preferably, also comprise at least one two position three way directional control valve, described valve group also comprises at least one second valve group filler opening; Each two position three way directional control valve respectively with a valve group oil outlet, liquid proportional reduction valve and one the second corresponding setting of valve group filler opening, control each valve group oil outlet and be communicated with the oil outlet or the second valve group filler opening of corresponding liquid proportional reduction valve; When described two position three way directional control valve was in first working position, described valve group oil outlet was communicated with the oil outlet of corresponding liquid proportional reduction valve; When described two position three way directional control valve is in second working position, described valve group oil outlet and corresponding second valve group filler opening connection.
Described liquid proportional reduction valve, described two position three way directional control valve, described valve group oil outlet and the described second valve group filler opening are set to one respectively.
But the hoist hydraulic control system of arm provided by the invention and elevator compound motion, comprise telescopic oil cylinder, lifting motor, the first liquid proportional position control valve, second liquid proportional position control valve and the pilot-actuated valve, wherein, when the spool of the described first liquid proportional position control valve is in first working position, the rod chamber of described telescopic oil cylinder and the conducting of pressure oil circuit, when its spool is in second working position, the rodless cavity of described telescopic oil cylinder and the conducting of pressure oil circuit; When the spool of the described second liquid proportional position control valve is in first working position, the just commentaries on classics liquid entering hole of described lifting motor and the conducting of pressure oil circuit, when its spool is in second working position, the counter-rotating liquid entering hole of described lifting motor and the conducting of pressure oil circuit; Described pilot-actuated valve has four pilot pressure oil exports that pilot pressure is provided for described first and second liquid proportional position control valve, wherein, the first pilot pressure oil export and the second pilot pressure oil export are respectively applied for two working positions of the described first liquid proportional position control valve of control, and the 3rd pilot pressure oil export and the 4th pilot pressure oil export are respectively applied for two working positions of the control second liquid proportional position control valve; And the aperture of described liquid proportional position control valve changes along with the variation of pilot pressure; Also comprise two foregoing proportional pressure-reducing valve groups, wherein, the first valve group filler opening of the first proportional pressure-reducing valve group is communicated with the primary importance of first liquid proportional position control valve control mouth; The oil outlet of the first proportional pressure-reducing valve group is communicated with the primary importance control mouth of the second liquid proportional position control valve; The first valve group filler opening of the second proportional pressure-reducing valve group is communicated with the second place of first liquid proportional position control valve control mouth; The oil outlet of the second proportional pressure-reducing valve group is communicated with the second place control mouth of the second liquid proportional position control valve.
Preferably, described first and second proportional pressure-reducing valve group also comprises the two position three way directional control valve and the second valve group filler opening respectively, and wherein, the second valve group filler opening of the described first proportional pressure-reducing valve group is communicated with the 3rd pilot pressure hydraulic fluid port; When the two position three way directional control valve of the described first proportional pressure-reducing valve group was in first working position, the oil outlet of the liquid proportional reduction valve of the described first proportional pressure-reducing valve group was communicated with valve group oil outlet; When the two position three way directional control valve of the described first proportional pressure-reducing valve group was in second working position, the second valve group filler opening of the described first proportional pressure-reducing valve group was communicated with valve group oil outlet.
The second valve group filler opening of the described second proportional pressure-reducing valve group is communicated with the 4th pilot pressure hydraulic fluid port; When the two position three way directional control valve of the described second proportional pressure-reducing valve group was in first working position, the oil outlet of the liquid proportional reduction valve of the described second proportional pressure-reducing valve group was communicated with valve group oil outlet; When the two position three way directional control valve of the described second proportional pressure-reducing valve group was in second working position, the second valve group filler opening of the described second proportional pressure-reducing valve group was communicated with valve group oil outlet.
Preferably, also comprise first pressure relay and second pressure relay, the two position three way directional control valve of described first and second proportional pressure-reducing valve group is a motor-operated control valve; Wherein, described automatically controlled two position three way directional control valve is in first working position during for power failure state, described automatically controlled two position three way directional control valve be in second working position during electricity condition; The hydraulic fluid port of getting of described first pressure relay is communicated with the 3rd pilot pressure hydraulic fluid port, and the output electrical signal is to the control signal receiving terminal of the electronic two position three way directional control valve of the described first proportional pressure-reducing valve group; The hydraulic fluid port of getting of described second pressure relay is communicated with the 4th pilot pressure hydraulic fluid port, and the output electrical signal is to the control signal receiving terminal of the electronic two position three way directional control valve of the described second proportional pressure-reducing valve group.
Compare with existing electric proportional pressure-reducing valve, liquid proportional reduction valve provided by the invention is to control the decompression of realization ratio by fluid power, guarantees that delivery pressure changes according to predetermined proportionate relationship with the variation of incoming pressure.Described liquid proportional reduction valve has two filler openings, the pressure oil of its first filler opening acts on the miner diameter end spool end, and the pressure oil of its second filler opening acts on the annular table terrace of large and small footpath section junction point and by radial direction through hole on the spool and axial hole and acts on the bigger diameter end spool end.After the Minimum operating pressure in liquid proportional reduction valve application loop is determined, the input pressure of its first filler opening is constant Minimum operating pressure value, when the incoming pressure of its second filler opening during greater than this steady state value, because the valve core structure size is determined, and the input pressure of first filler opening is a steady state value, and therefore, proportionate relationship can be determined between its delivery pressure and the incoming pressure, that is P,
2=P
A1S
1/ S
2+ P
1(S
2-S
1)/S
2, post-decompression spool is in the equilibrium position; When if the incoming pressure of second filler opening changes, corresponding slip can take place spool and spool is in new equilibrium position, at this moment, corresponding variation has taken place with the area that is communicated with between second filler opening in radial direction through hole on the spool, and the delivery pressure of oil outlet changes thereupon.When incoming pressure during less than predetermined value, the present invention does not play decompression.The physical dimension that goes out proportionate relationship between oil pressure and the input pressure and spool of liquid proportional reduction valve of the present invention is relevant, can guarantee the output accuracy that delivery pressure concerns by a certain percentage, effectively avoid the influence of the controlled electrical signal of electric proportional pressure-reducing valve and the unsettled defective of delivery pressure value brought; In addition, because the precision of delivery pressure only is subjected to the restriction of self structure, need not to increase the extra raising precision of controlling cost.
Proportional pressure-reducing valve group provided by the invention is made up of Fixed pressure reducing valve and liquid proportional reduction valve, and the oil outlet of described Fixed pressure reducing valve is communicated with first filler opening of liquid proportional reduction valve, is the pressure oil liquid that constant pressure is provided of liquid proportional reduction valve.During use, set up the delivery pressure of described Fixed pressure reducing valve according to the Minimum operating pressure in its loop of using, when the oil pressure of incoming pressure oil during greater than scheduled pressure value, described Fixed pressure reducing valve can provide constant compression force oil for first filler opening of described liquid proportional reduction valve, simultaneously, this incoming pressure oil acts on second filler opening of described liquid proportional reduction valve, based on described liquid proportional reduction valve action principle, the oil outlet pressure of described proportional pressure-reducing valve group changes along with incoming pressure and changes according to certain proportionate relationship.When the oil pressure of incoming pressure oil during less than scheduled pressure value, described valve group does not play decompression.The present invention becomes one Fixed pressure reducing valve and liquid proportional reduction valve, can simplify the line arrangement of hydraulic system, is easy to I﹠ M.
But the hoist hydraulic control system of arm provided by the invention and elevator compound motion, adopt two foregoing proportional pressure-reducing valve groups, when the first pilot pressure hydraulic fluid port of handling pilot-actuated valve is communicated with the primary importance control mouth of the first liquid proportional position control valve, finish the telescopic oil cylinder recovery operation, the first pilot pressure oil through the first proportional pressure-reducing valve group after the output and the pressure oil of the proportional relationship change of first pilot pressure, to the second liquid proportional position control valve primary importance control mouthful, finish the elevator reverse turn operation that hoists; When the second pilot pressure hydraulic fluid port of handling pilot-actuated valve is communicated with the second place control mouth of the first liquid proportional position control valve, finish telescopic oil cylinder and stretch out operation, the second pilot pressure oil through the second proportional pressure-reducing valve group after the output and the pressure oil of the proportional relationship change of second pilot pressure, to the second place control mouth of the second liquid proportional position control valve, finish the elevator that hoists and just changeing operation; And then can realize reliably that arm stretches out the compound motion of putting rope with elevator, and the rope speed of putting of elevator becomes certain proportionate relationship with the speed of stretching out of arm, can guarantee that the distance between the suspension hook and arm arm head roughly remained unchanged when arm stretched out.
Description of drawings
Fig. 1 a is the overall structure sectional view of liquid proportional reduction valve provided by the present invention;
Fig. 1 b is that liquid proportional reduction valve of the present invention is in the structural representation when reducing pressure working state;
Fig. 1 c is the structural representation in outlet pressure when overload of liquid proportional reduction valve of the present invention;
Fig. 2 a is the hydraulic schematic diagram of proportional pressure-reducing valve group provided by the present invention;
Fig. 2 b is the outward appearance explosive view of proportional pressure-reducing valve group provided by the present invention;
But Fig. 3 is the hydraulic schematic diagram of the hoist hydraulic control system of arm provided by the present invention and elevator compound motion.
Among the figure:
Telescopic oil cylinder 1, lifting motor 2, liquid proportional control valve group 3, the first liquid proportional position control valve 31, the second liquid proportional position control valve 32;
Pilot-actuated valve 4, the first pilot pressure oil export 41, the second pilot pressure oil export 42, the 3rd pilot pressure oil export 43, the 4th pilot pressure oil export 44;
Proportional pressure-reducing valve group 5, liquid proportional reduction valve 51, valve body 511, the first filler opening A1, second oil inlet P 1, oil outlet P2 ', spool 512, ring surface 513, radial direction through hole d, axial hole f, circlip 514, Fixed pressure reducing valve 52, two position three way directional control valve 53, the first proportional pressure-reducing valve group 5 ', the second proportional pressure-reducing valve group, 5 ＂;
First pressure relay 6 ', second pressure relay, 6 ＂.
Embodiment
Core design of the present invention is to provide a kind of liquid proportional reduction valve 51, realizes that by fluid power control delivery pressure can concern according to a certain percentage that the variation with incoming pressure changes.See also Fig. 1 a, this figure is the overall structure sectional view of liquid proportional reduction valve.
As shown in Figure 1a, this valve mainly is made up of two-part: valve body 511 and the spool 512 that is arranged in the valve body 511, can slide in valve body 511 inner chambers at described spool 512 under the effect of pressure oil.Wherein, spool 512 is the multidiameter shaft shape, and section two-part junction point in the big footpath of spool path section and spool forms ring surface 513; Have radial direction through hole d on the described spool 512 path sections, have the axial hole f that is communicated with described radial direction through hole d on the spool exterior edge face of described spool 512 big footpath sections; And with described spool 512 accordingly, described body cavity has and the path section of spool and big footpath section are slidingly matched respectively path section and big footpath section; Along the glide direction of described spool 512, have the first filler opening A1, second oil inlet P 1 and oil outlet P2 ' on the sidewall of described valve body successively; Wherein, the pressure oil that enters through the described first filler opening A1 acts on the end face of described path section spool, the miner diameter end of described spool can be for shown in the figure stepped, to improve the pressure oil liquid storage amount in the path section spool outside, improve the sensitivity of spool action.
On the pressure oil that described second oil inlet P 1 enters acts on annular table terrace 513 between the section of described path Duan Yuda footpath, and the oil duct that forms via radial direction through hole d and axial hole f is from described oil outlet P2 ' outflow;
The input pressure of the described first filler opening A1 is steady state value P
A1And the input pressure P of described second oil inlet P 1
1During greater than described steady state value, with the input pressure P of described second oil inlet P 1
1Change accordingly the fuel-displaced pressure P of described oil outlet P2 '
2Be linear change according to the following equation:
P
2＝P
A1·S
1/S
2+P1·(S
2-S
1)/S
2；
In the formula, P
A1: the first filler opening input pressure; P
1: the second filler opening input pressure; P
2: oil outlet goes out oil pressure; S
1: the radial cross section area of path section spool; S
2: the radial cross section area of big footpath section spool.
Specify the working principle of described liquid proportional reduction valve below.
The input pressure of the first filler opening A1 acts on the left end area S of described spool 512
1On, its right side limit position is circlip 514 places of spool 512 right-hand members; The input pressure of second oil inlet P 1 acts on the ring surface 513, and connect arrival oil outlet P2 ' by valve body e chamber, radial direction through hole d and axial hole f, the pressure in P2 ' chamber acts on the section exterior edge face, big footpath (being the spool detection faces) of spool 512, and pressure oil flows to and is: P1 → e → d → f → P2 '.Be understandable that, when the input pressure of the described first filler opening A1 less than the input pressure of default steady state value, described second oil inlet P 1 during also less than default steady state value, described spool 3 is not subjected to displacement, the pressure of oil outlet P2 ' equals the pressure of second oil inlet P 1, and described liquid proportional reduction valve does not play decompression.
Along with the increase of second oil inlet P, 1 pressure, described spool 512 residing equilibrium positions change, and spool 512 slides left under the pressure effect of oil outlet P2 ', and according to formula P
2=P
A1S
1/ S
2+ P
1(S
2-S
1)/S
2Set up new equilibrium position, i.e. position shown in Fig. 1 b, this moment described spool 512 the e chamber of radial direction through hole and described valve body 511 between the area that is communicated with diminish, described liquid proportional reduction valve plays decompression.
Further, have oil return inlet T on the valve body between the described first filler opening A1 and second oil inlet P 1; Work as P
2S
2P
A1S
1+ P
1(S
2-S
1) time, described spool 512 slides under the effect of oil outlet P2 ' pressure oil, described oil return inlet T is communicated with oil outlet P2 ' by the axial hole 514 and the radial direction through hole 515 of described spool, when the pressure overload of oil outlet P2 ', described spool 512 further slides left, shown in Fig. 1 c, oil outlet P2 ' overload pressure oil is connected oil return inlet T, thereby guarantees that system pressure is stable.
Need explanation, the constant input pressure value of the described first filler opening A1 and adjust the path section of spool 512 and the section area of big footpath section compares S
1/ S
2, all can determine according to actual conditions, make that the proportionate relationship according to expection is linear change between downstream pressure and the upstream pressure.
See also Fig. 2 a and Fig. 2 b, Fig. 2 a is the hydraulic schematic diagram of proportional pressure-reducing valve group provided by the present invention, and Fig. 2 b is the outward appearance explosive view of proportional pressure-reducing valve group of the present invention.
Shown in Fig. 2 a, described proportional pressure-reducing valve group 5 comprises liquid proportional reduction valve 51 and Fixed pressure reducing valve 52, and wherein, the composition of described liquid proportional reduction valve 51 and annexation do not repeat them here as previously mentioned; Described Fixed pressure reducing valve 52 is identical with the principle and the structure of existing standard Fixed pressure reducing valve, so do not repeat them here.
The oil outlet A1 of described Fixed pressure reducing valve 52 is communicated with the first filler opening A1 of described liquid proportional reduction valve 51; Described valve group 5 has the first valve group oil inlet P 1 and valve group oil outlet P2, and wherein, the described first valve group oil inlet P 1 is communicated with respectively with the oil inlet P 1 of Fixed pressure reducing valve and second oil inlet P 1 of described liquid proportional reduction valve 51; Described valve group oil outlet P2 is communicated with the oil outlet P2 ' of described liquid proportional reduction valve 51.
Specify the working principle of described proportional pressure-reducing valve group below.
Pressure oil is divided into two-way after the first valve group oil inlet P 1 of valve group 5 enters the valve group, wherein a road binders guarantees that by described Fixed pressure reducing valve 52 pressure of the described liquid proportional reduction valve first filler opening A1 is steady state value through the first filler opening A1 of the described liquid proportional reduction valve of described Fixed pressure reducing valve 52 arrival; Wherein another road binders enters liquid proportional reduction valve 51 through second oil inlet P 1 of described liquid proportional reduction valve 51, after decompression, the pressure of the valve group oil outlet P2 of described proportional pressure-reducing valve group 5 is relationship change according to a certain percentage along with the variation of input pressure P1, and the derivation of concrete proportionate relationship as previously mentioned.
See also Fig. 2 b, this figure is the outward appearance explosive view of described proportional pressure-reducing valve group.Shown in Fig. 2 b, described liquid proportional reduction valve 51 and Fixed pressure reducing valve 52 are integrated into a valve group, and integrated back valve group helps the assembling of hydraulic system more, reduces the system maintenance cost.
Further, shown in Fig. 2 a and Fig. 2 b, described proportional pressure-reducing valve group 5 also comprises two position three way directional control valve 53, and described valve group 5 also comprises the second valve group oil inlet P, 2 ＂; Described two position three way directional control valve 53 is used for control valve group oil outlet P2 and is communicated with the oil outlet P2 ' or the second valve group oil inlet P, 2 ＂ of liquid proportional reduction valve 51; When described two position three way directional control valve 53 was in first working position, described valve group oil outlet P2 was communicated with the oil outlet P2 ' of liquid proportional reduction valve 51; When described two position three way directional control valve 53 was in second working position, described valve group oil outlet P2 was communicated with P2 ＂ with the second valve group filler opening.The purpose of design like this, can improve the applicability of described proportional pressure-reducing valve group 5, needs according to the actual hydraulic pressure control system, by the control action of described two position three way directional control valve 53, valve group 5 can realize optionally exporting the pressure oil of the liquid proportional reduction valve 51 oil outlet P2 ' of the pressure oil of the second valve group oil inlet P, 2 ＂ directions or the first valve group oil inlet P, 1 direction.
In fact, described liquid proportional reduction valve 51, described two position three way directional control valve 53, described valve group oil outlet P2 and the described second valve group oil inlet P, 2 ＂ all can be set to a plurality of (not shown)s, and corresponding respectively the setting.Like this, described proportional pressure-reducing valve group just can have a plurality of decompression output circuits, that is to say, variation for an incoming pressure can obtain a plurality of delivery pressures that the proportionate relationship decompression changes that are, certainly, if the cross sectional area in the path section of the spool of each liquid proportional reduction valve and big footpath section is than different, described a plurality of delivery pressures are also different with proportionate relationship between the incoming pressure.
See also Fig. 3, but this figure is the hydraulic schematic diagram of the hoist hydraulic control system of arm provided by the present invention and elevator compound motion.
As shown in Figure 3, telescopic oil cylinder 1 provides power for the stretching out of telescopic crane boom, recovery operation, and when the nothing of telescopic oil cylinder 1 or rod chamber and the conducting of pressure oil circuit, telescopic boom is finished and stretched out or regain action.Lifting motor 2 provides power for putting rope or receiving rop exercise of suspension hook haulage cable, when the just commentaries on classics filler opening of lifting motor 2 or counter-rotating filler opening and the conducting of pressure oil circuit, elevator forward or reverse is thereupon realized putting rope or is received rop exercise and do, and then realizes the rising or the down maneuver of suspension hook.
Liquid proportional control valve group 3 comprises: the first liquid proportional position control valve 31 and the second liquid proportional position control valve 32 are respectively applied for direction and the flow of controlling pressure oil in telescopic oil cylinder and the lifting motor control loop.Shown in the figure, the described first liquid proportional position control valve 31 and the second liquid proportional position control valve 32 are the 3-position 4-way hydraulic control valve, and three valve position are respectively first working position, meta and second working position.Wherein, when the spool of the described first liquid proportional position control valve 31 is in first working position, the rod chamber of described telescopic oil cylinder 1 and the conducting of pressure oil circuit, when its spool is in second working position, the rodless cavity of described telescopic oil cylinder 1 and the conducting of pressure oil circuit; When the spool of the described second liquid proportional position control valve 32 is in first working position, the just commentaries on classics liquid entering hole of described lifting motor 2 and the conducting of pressure oil circuit, when its spool is in second working position, the counter-rotating liquid entering hole of described lifting motor 2 and the conducting of pressure oil circuit; Need to prove that the described first liquid proportional position control valve 31 is identical with the hydraulic control system of existing arm and elevator with the meta function of the second liquid proportional position control valve 32, so do not repeat them here.
Described pilot-actuated valve 4 has four pilot pressure oil exports that pilot pressure is provided for described first and second liquid proportional position control valve, wherein, the first pilot pressure oil export 41 and the second pilot pressure oil export 42 are respectively applied for two working positions of the described first liquid proportional position control valve 31 of control, and the 3rd pilot pressure oil export 43 and the 4th pilot pressure oil export 44 are respectively applied for two working positions of the control second liquid proportional position control valve 32; The aperture of described first and second liquid proportional position control valve changes along with the variation of pilot pressure, and promptly pilot pressure is big more, and the aperture of liquid proportional position control valve is big more; Equally, need to prove that no longer be further described specifically for described pilot-actuated valve 4, those skilled in the art can realize this programme fully based on prior art.
Shown in the figure, this control system also comprises two foregoing proportional pressure-reducing valve groups: the first proportional pressure-reducing valve group 5 ' and the second proportional pressure-reducing valve group, 5 ＂.Wherein, the first proportional pressure-reducing valve group 5 ' the primary importance control of the first valve group oil inlet P 1 and the first liquid proportional position control valve 31 mouthful be communicated with; The oil outlet P2 of the first proportional pressure-reducing valve group is communicated with the primary importance control mouth of the second liquid proportional position control valve 32; When the first pilot pressure hydraulic fluid port 41 of handling pilot-actuated valve 4 is communicated with (telescopic oil cylinder withdrawal) with the primary importance control mouth of the first liquid proportional position control valve 31, the first pilot pressure oil is through the pressure oil of the first proportional pressure-reducing valve group 5 ' back output with the proportional relationship change of first pilot pressure, to the second liquid proportional position control valve 32 primary importance control mouthful (elevator that a hoists counter-rotating), can realize that arm is regained and elevator is received the compound motion of restricting, and the receipts rope speed of elevator becomes certain proportionate relationship with the withdrawal speed of arm, and then the distance between suspension hook and the arm arm head roughly remains unchanged can guarantee that arm is regained the time.Wherein, the first valve group oil inlet P 1 of the second proportional pressure-reducing valve group, 5 ＂ is communicated with the second place control mouth of the first liquid proportional position control valve 31; The oil outlet P2 of the second proportional pressure-reducing valve group, 5 ＂ is communicated with the second place of the second liquid proportional position control valve 32 control mouth; When the second pilot pressure hydraulic fluid port 42 of handling pilot-actuated valve 4 is communicated with (telescopic oil cylinder stretches out) with the second place control mouth of the first liquid proportional position control valve 31, the second pilot pressure oil through the second proportional pressure-reducing valve group, 5 ＂ after the output and the pressure oil of the proportional relationship change of second pilot pressure, second place control mouthful (elevator that hoists just changes) to the second liquid proportional position control valve 32, can realize that arm stretches out the compound motion of putting rope with elevator, and the rope speed of putting of elevator becomes certain proportionate relationship with the speed of stretching out of arm, and then the distance between suspension hook and the arm arm head roughly remains unchanged can guarantee that arm stretches out the time.
Further, as shown in Figure 3, described first and second proportional pressure-reducing valve group also comprises the two position three way directional control valve and the second valve group filler opening respectively.
Wherein, the described first proportional pressure-reducing valve group 5 ' the second valve group filler opening be communicated with the 3rd pilot pressure hydraulic fluid port 43, the described first proportional pressure-reducing valve group 5 ' two position three way directional control valve when being in first working position, the described first proportional pressure-reducing valve group 5 ' the liquid proportional reduction valve oil outlet through the described first proportional pressure-reducing valve group 5 ' the two position three way directional control valve and the primary importance control of valve group oil outlet and the described second liquid proportional position control valve 32 mouthful be communicated with; The described first proportional pressure-reducing valve group 5 ' two position three way directional control valve when being in second working position, described the 3rd pilot pressure hydraulic fluid port 43 through the described first proportional pressure-reducing valve group 5 ' the primary importance control of the second valve group filler opening, two position three way directional control valve and valve group oil outlet and the described second liquid proportional position control valve 32 mouthful be communicated with.
Wherein, the second valve group filler opening of the described second proportional pressure-reducing valve group, 5 ＂ is communicated with the 4th pilot pressure hydraulic fluid port 44; When the two position three way directional control valve of the described second proportional pressure-reducing valve group, 5 ＂ was in first working position, the oil outlet of the liquid proportional reduction valve of the described second proportional pressure-reducing valve group, 5 ＂ was communicated with the second place control mouth of the described second liquid proportional position control valve 32 through two position three way directional control valve and the valve group oil outlet of the described second proportional pressure-reducing valve group, 5 ＂; When the two position three way directional control valve of the described second proportional pressure-reducing valve group, 5 ＂ was in second working position, described the 4th pilot pressure hydraulic fluid port 44 was communicated with the second place control mouth of the described second liquid proportional position control valve 32 through the second valve group filler opening, two position three way directional control valve and the valve group oil outlet of the described second proportional pressure-reducing valve group, 5 ＂.
Further, two position three way directional control valve in described first and second proportional pressure-reducing valve group is a motor-operated control valve, described automatically controlled two position three way directional control valve is in first working position during for power failure state, described automatically controlled two position three way directional control valve be in second working position during electricity condition.Described first pressure relay 6 ' the hydraulic fluid port of getting be communicated with the 3rd pilot pressure hydraulic fluid port 43, and the output electrical signal to the described first proportional pressure-reducing valve group 5 ' the control signal receiving terminal of electronic two position three way directional control valve, this two position three way directional control valve is in first working position, the i.e. second valve group filler opening and the conducting of valve group oil outlet (elevator is received rope) realizes that suspension hook plays lift operations separately; The hydraulic fluid port of getting of described second pressure relay, 6 ＂ is communicated with the 4th pilot pressure hydraulic fluid port 44, and the output electrical signal is to the control signal receiving terminal of the electronic two position three way directional control valve of the described second proportional pressure-reducing valve group, 5 ＂, at this moment, this two position three way directional control valve is in first working position, the i.e. second valve group filler opening and valve group oil outlet conducting (elevator is put rope) realizes the independent step-down operation of suspension hook.
To sum up, pilot-actuated valve of the present invention is by the motion of guide's oil circuit control liquid proportional position control valve spool, being in proportion of the size of pilot pressure and valve core opening; Adopt two proportional pressure-reducing valve groups to guarantee that downstream pressure and upstream pressure keep certain proportion, guarantee that just the pressure of control first liquid proportional direction control and the pressure of the second liquid proportional position control valve keep certain ratio, it is proportional promptly to control the speed of telescopic oil cylinder or hoist motor by hydraulic fluid flow rate; Realize that telescopic oil cylinder drives the compound motion of the running realization hook lifting of arm and flexible hoist motor.
What specify is, control system of the present invention is not limited to and is applied to the crane hoisting arm expansion oil cylinder and the hoist motor that hoists, in fact, those of ordinary skill in the art can be applied to other workplace fully based on working principle of the present invention, realizes the composite move of two hydraulic actuators; As long as working principle according to the invention is all in the protection domain of this patent.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the liquid proportional reduction valve comprises valve body and the spool that is arranged in the body cavity, and described spool can slide in body cavity under the effect of pressure oil, it is characterized in that,
Described spool is the multidiameter shaft shape, is made of path section and big footpath section two-part; Have radial direction through hole on the path section of described spool, have the axial hole that is communicated with described radial direction through hole on the spool exterior edge face of the big footpath of described spool section; And
With described spool accordingly, described body cavity has the path section that is slidingly matched with spool and big footpath section; Along the glide direction of described spool, have first filler opening, second filler opening and oil outlet on the sidewall of described valve body successively; Wherein,
Act on through the pressure oil that described first filler opening enters on the end face of described path section spool;
On the pressure oil that described second filler opening enters acts on annular table terrace between the section of described path Duan Yuda footpath, and the oil duct that forms via radial direction through hole and axial hole flows out from described oil outlet;
The input pressure of described first filler opening is the input pressure of steady state value and described second filler opening during greater than described steady state value, with the variation of the described second filler opening input pressure accordingly, the oil pressure that goes out of described oil outlet is linear change according to the following equation:
P
2＝P
A1·S
1/S
2+P
1·(S
2-S
1)/S
2；
In the formula, P
A1: the first filler opening input pressure; P
1: the second filler opening input pressure; P
2: oil outlet goes out oil pressure; S
1: the radial cross section area of path section spool; S
2: the radial cross section area of big footpath section spool.
2. liquid proportional reduction valve according to claim 1 is characterized in that, has return opening on the valve body between described first filler opening and second filler opening;
Work as P
2S
2P
A1S
1+ P
1(S
2-S
1) time, described spool slides under the effect of oil outlet pressure oil, and described return opening is communicated with oil outlet by the axial hole and the radial direction through hole of described spool.
3. the proportional pressure-reducing valve group is characterized in that, comprising:
At least one liquid proportional reduction valve as claimed in claim 1 or 2; With
A Fixed pressure reducing valve, its oil outlet are communicated with first filler opening of described at least one liquid proportional reduction valve respectively; And described valve group has:
The first valve group filler opening is communicated with respectively with the filler opening of Fixed pressure reducing valve and second filler opening of described at least one liquid proportional reduction valve; With
At least one valve group oil outlet is communicated with described at least one liquid proportional reduction valve oil outlet respectively.
4. proportional pressure-reducing valve group according to claim 3 is characterized in that, described liquid proportional reduction valve and described valve group oil outlet are set to one respectively.
5. proportional pressure-reducing valve group according to claim 3 is characterized in that, also comprises at least one two position three way directional control valve, and described valve group also comprises at least one second valve group filler opening; Each two position three way directional control valve respectively with a valve group oil outlet, liquid proportional reduction valve and one the second corresponding setting of valve group filler opening, control each valve group oil outlet and be communicated with the oil outlet or the second valve group filler opening of corresponding liquid proportional reduction valve; When described two position three way directional control valve was in first working position, described valve group oil outlet was communicated with the oil outlet of corresponding liquid proportional reduction valve; When described two position three way directional control valve is in second working position, described valve group oil outlet and corresponding second valve group filler opening connection.
6. proportional pressure-reducing valve group according to claim 5 is characterized in that, described liquid proportional reduction valve, described two position three way directional control valve, described valve group oil outlet and the described second valve group filler opening are set to one respectively.
7. but the hoist hydraulic control system of arm and elevator compound motion comprises:
Telescopic oil cylinder;
Lifting motor;
The first liquid proportional position control valve, when its spool is in first working position, the rod chamber of described telescopic oil cylinder and the conducting of pressure oil circuit; When its spool is in second working position, the rodless cavity of described telescopic oil cylinder and the conducting of pressure oil circuit;
The second liquid proportional position control valve, when its spool is in first working position, the just commentaries on classics liquid entering hole of described lifting motor and the conducting of pressure oil circuit; When its spool is in second working position, the counter-rotating liquid entering hole of described lifting motor and the conducting of pressure oil circuit; With
Pilot-actuated valve, have four pilot pressure oil exports that pilot pressure is provided for described first and second liquid proportional position control valve, wherein, the first pilot pressure oil export and the second pilot pressure oil export are respectively applied for two working positions of the described first liquid proportional position control valve of control; The 3rd pilot pressure oil export and the 4th pilot pressure oil export are respectively applied for two working positions of the control second liquid proportional position control valve; And
The aperture of described liquid proportional position control valve changes along with the variation of pilot pressure; It is characterized in that, also comprise:
Two proportional pressure-reducing valve groups as claimed in claim 3, wherein:
The first valve group filler opening of the first proportional pressure-reducing valve group is communicated with the primary importance of first liquid proportional position control valve control mouth; The oil outlet of the first proportional pressure-reducing valve group is communicated with the primary importance control mouth of the second liquid proportional position control valve;
The first valve group filler opening of the second proportional pressure-reducing valve group is communicated with the second place of first liquid proportional position control valve control mouth; The oil outlet of the second proportional pressure-reducing valve group is communicated with the second place control mouth of the second liquid proportional position control valve.
8. but the hoist hydraulic control system of arm according to claim 7 and elevator compound motion is characterized in that, described first and second proportional pressure-reducing valve group also comprises the two position three way directional control valve and the second valve group filler opening respectively, wherein:
The second valve group filler opening of the described first proportional pressure-reducing valve group is communicated with the 3rd pilot pressure hydraulic fluid port; When the two position three way directional control valve of the described first proportional pressure-reducing valve group was in first working position, the oil outlet of the liquid proportional reduction valve of the described first proportional pressure-reducing valve group was communicated with valve group oil outlet; When the two position three way directional control valve of the described first proportional pressure-reducing valve group was in second working position, the second valve group filler opening of the described first proportional pressure-reducing valve group was communicated with valve group oil outlet;
The second valve group filler opening of the described second proportional pressure-reducing valve group is communicated with the 4th pilot pressure hydraulic fluid port; When the two position three way directional control valve of the described second proportional pressure-reducing valve group was in first working position, the oil outlet of the liquid proportional reduction valve of the described second proportional pressure-reducing valve group was communicated with valve group oil outlet; When the two position three way directional control valve of the described second proportional pressure-reducing valve group was in second working position, the second valve group filler opening of the described second proportional pressure-reducing valve group was communicated with valve group oil outlet.
9. but the hoist hydraulic control system of arm according to claim 8 and elevator compound motion, it is characterized in that also comprise first pressure relay and second pressure relay, the two position three way directional control valve of described first and second proportional pressure-reducing valve group is a motor-operated control valve, wherein
Described automatically controlled two position three way directional control valve is in first working position during for power failure state, described automatically controlled two position three way directional control valve be in second working position during electricity condition;
The hydraulic fluid port of getting of described first pressure relay is communicated with the 3rd pilot pressure hydraulic fluid port, and the output electrical signal is to the control signal receiving terminal of the electronic two position three way directional control valve of the described first proportional pressure-reducing valve group; The hydraulic fluid port of getting of described second pressure relay is communicated with the 4th pilot pressure hydraulic fluid port, and the output electrical signal is to the control signal receiving terminal of the electronic two position three way directional control valve of the described second proportional pressure-reducing valve group.
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| CN2008102115358A CN101676589B (en) | 2008-09-17 | 2008-09-17 | Liquid proportional pressure-reducing valve, valve bank, suspension arm and winding hydraulic pressure control system |
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| CN101676589B true CN101676589B (en) | 2011-01-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102431911B (en) * | 2011-09-29 | 2013-07-24 | 中联重科股份有限公司 | Suspension arm telescopic action control method, device and engineering machinery |
| CN102583172A (en) * | 2011-12-19 | 2012-07-18 | 徐州重型机械有限公司 | Suspension arm telescopic hydraulic control system and crane with same |
| CN103161781A (en) * | 2013-04-01 | 2013-06-19 | 武汉科技大学 | Pressure peak control valve used for hydraulic system |
| CN106744329B (en) * | 2016-12-22 | 2018-08-07 | 北汽福田汽车股份有限公司 | A kind of crane and its telescoping mechanism and secondary hoisting mechanism coordinated control system |
| CN107989991B (en) * | 2017-11-29 | 2019-06-14 | 北京理工大学 | A kind of bidirectional slide valve type electro-hydraulic proportional reducing valve |
| CN111237277B (en) * | 2020-01-17 | 2021-10-15 | 太原理工大学 | Proportional flow valve based on pilot flow-main spool displacement feedback mechanism |
| CN113978438B (en) * | 2021-09-13 | 2023-03-03 | 中国北方车辆研究所 | Constant-proportion pressure distribution valve |
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Assignee: Zuzhou Xugong Lorry-mounted Crane Co., Ltd. Assignor: Xuzhou Heavy Machinery Co., Ltd. Contract record no.: 2011320000246 Denomination of invention: Liquid proportional pressure-reducing valve, valve bank, suspension arm and winding hydraulic pressure control system Granted publication date: 20110105 License type: Exclusive License Open date: 20100324 Record date: 20110311 |