CN105179356B - Auxiliary boom control valve, auxiliary boom hydraulic control system and crane - Google Patents

Auxiliary boom control valve, auxiliary boom hydraulic control system and crane Download PDF

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Publication number
CN105179356B
CN105179356B CN201510536651.7A CN201510536651A CN105179356B CN 105179356 B CN105179356 B CN 105179356B CN 201510536651 A CN201510536651 A CN 201510536651A CN 105179356 B CN105179356 B CN 105179356B
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valve
oil
auxiliary
pressure
return
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CN105179356A (en
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王守伟
任印美
周飞鹏
于敬利
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Xuzhou Heavy Machinery Co Ltd
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Xuzhou Heavy Machinery Co Ltd
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Abstract

The invention relates to an auxiliary boom control valve, an auxiliary boom hydraulic control system and a crane. The auxiliary boom control valve comprises a valve body, wherein a switching valve, a reversing valve and an oil-returning pressure control valve are arranged on the valve body; an oil opening of the switching valve is connected with an oil inlet in the valve body; the other oil opening of the switching valve is connected with an oil inlet of the reversing valve; the switching valve is used for controlling on and off of a main oil supply line; the reversing valve is used for reversing between at least two working oil openings in the valve body; one oil opening of the oil-returning pressure control valve is connected with an oil returning opening of the reversing valve; the other oil opening of the oil-returning pressure control valve is connected with the oil returning opening in the valve body; the oil-returning pressure control valve is used for controlling the magnitude of the oil returning backpressure; a spring-free control cavity of the oil-returning pressure control valve is connected with a connection oil line between the switching valve and the reversing valve. The auxiliary boom control valve is capable of reducing the oil returning backpressure during working and increasing the oil returning backpressure when not working, thereby avoiding the danger caused by rapid falling of a working cylinder when working again.

Description

Auxiliary control valve, auxiliary hydraulic control system and crane
Technical field
The present invention relates to technical field of engineering machinery, more particularly to a kind of auxiliary control valve, auxiliary hydraulic control system and Crane.
Background technology
In recent years, as domestic large-tonnage, super-tonnage crane are developed rapidly, user has higher to crane It is required that, such as require there be operation height and bigger operation amplitude higher etc..In order to increase the hoisting height of crane, generally Fixed auxiliary cargo boom is configured on principal arm arm head, principal arm is commonly referred arm, by turret supports and oil-cylinder variable amplitude, stretched Angle change and the action of semi-girder contracting arm are realized, for weight of slinging;And auxiliary cargo boom is also referred to as fixing auxiliary or auxiliary, it is used to increase Plus brachium.Fixed auxiliary is arranged on main arm of crane, changes amplitude in zero load, to adjust the position of suspension hook or other suspenders Put, and in weight lifting moving process, amplitude will not change, and play a part of to increase total arm length and operation amplitude.
In order to realize significantly operation, auxiliary is usually designed to the mechanism of amplitude-variable.With continuing to optimize for structure design And innovation, the luffing of crane subsidiary arm develops into the stepless luffing of present oil cylinder by the drawplate type machinery luffing for using earliest, real Now continuous within the specific limits to move and be positioned optional position in the range of, the stepless luffing of oil cylinder is typically by the flexible of oil cylinder To realize, this is accomplished by a set of special hydraulic system and is driven.Because kinetic pump is typically mounted on turntable, amplitude oil cylinder Be connected with auxiliary, and auxiliary in crane arm head foremost, therefore kinetic pump is to the distant of derricking cylinder, and the pressure loss is big, Therefore it is required that return oil pressure during auxiliary hydraulic work system is small, otherwise luffing efficiency is low, or even luffing attonity;And system is stopped When only working, there is the hydraulic oil of certain pressure in oil circuit, when otherwise reworking, after amplitude oil cylinder balanced valve is opened, oil cylinder Meeting rapid decrease, causes danger.
The valve body of auxiliary is controlled in existing auxiliary hydraulic system, double linked one-way valve is provided with its oil return line, it is through-flow straight Footpath is small, and return oil pressure is big, luffing inefficiency when causing system to work;If removing double linked one-way valve, work as system stalls Shi Buneng pins the fluid in oil circuit, now amplitude oil cylinder task again, may rapid decrease, cause danger, therefore this kind of Auxiliary control valve is undesirable to the control effect of hydraulic system.
The content of the invention
It is existing to solve the purpose of the present invention is to propose to a kind of auxiliary control valve, auxiliary hydraulic control system and crane The auxiliary control valve problem undesirable to the control effect of hydraulic system in technology.
To achieve the above object, the invention provides a kind of auxiliary control valve, including valve body, the valve body is provided with switch Valve, reversal valve and return pressure control valve, wherein a hydraulic fluid port of the switch valve is connected with the oil inlet on the valve body, institute Another hydraulic fluid port for stating switch valve is connected with the oil inlet of the reversal valve, and the switch valve is used to control the logical of main oil feeding line Disconnected, the reversal valve is used for the commutation between at least two actuator ports on the valve body, the one of the return pressure control valve Individual hydraulic fluid port is connected with the oil return opening of the reversal valve, returning on another hydraulic fluid port of return pressure control valve and the valve body Hydraulic fluid port is connected, and return pressure control valve is used to control the size of return oil pressure, the return pressure control valve without spring Connection oil communication between control chamber and the switch valve and the reversal valve.
Further, it is the sequence valve with preset pressure that the return pressure controls valve.
Further, the reversal valve is the three-position four-way electromagnetic directional valve with H type Median Functions.
Further, also it is connected at least two actuator ports and the valve body on the valve body including overflow valve Oil return opening between.
To achieve the above object, auxiliary control present invention also offers a kind of auxiliary hydraulic control system including above-mentioned Valve and at least two operating cylinders, at least two actuator ports connect with least two operating cylinder respectively on the valve body Connect, for controlling at least two operating cylinder to perform the action stretched out or retract.
Further, reel is also associated between the auxiliary control valve and at least two operating cylinder, institute Stating reel can change auxiliary control valve and described at least two according to the flexible of at least two operating cylinder The length of the connection oil circuit between individual operating cylinder.
Further, also protection and locking are played at least two operating cylinder including balanced valve.
Further, also including pressure sensor, for detecting the pressure size at least two operating cylinder.
Further, insertion valve is provided between at least two operating cylinder, for keeping at least two work Synchronism between oil cylinder.
To achieve the above object, auxiliary control valve or above-mentioned present invention also offers a kind of crane including above-mentioned Auxiliary hydraulic control system.
Based on above-mentioned technical proposal, auxiliary of the invention controls valve by setting switch valve, reversal valve and return pressure control Valve processed so that when switch valve is opened, oil inlet is connected by reversal valve with an actuator port on valve body on valve body, while Because return pressure control valve is without the connection oil communication between spring cavity and switch valve and reversal valve, the oil inlet from valve body Into the hydraulic oil in valve body be partly into return pressure control valve without spring cavity so that return pressure control valve open, Hydraulic oil can control valve oil return box through return pressure, and return oil pressure is smaller;When switch valve is closed, return pressure controls the nothing of valve Spring cavity pressure reduces, and return pressure control valve is closed, and return oil pressure increase can effectively pin the part fluid on oil circuit.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings:
Fig. 1 is the structural representation that auxiliary of the present invention controls valve one embodiment.
Fig. 2 is the structural representation of auxiliary hydraulic control system one embodiment of the present invention.
In figure:1- fuel tanks, 2- kinetic pumps, 3- auxiliarys control valve, the overflow valves of 31- first, the overflow valves of 32- second, 33- oil returns Pressure-control valve, 34- reversal valves, 35- switch valves, 4- reels, the balanced valves of 5- first, 6- operating cylinders, 7- pressure sensings Device, the balanced valves of 8- second, 9- insertion valves.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely retouched State.Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this hair Bright embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Example, belongs to the scope of protection of the invention.
In the description of the invention, it is to be understood that term " " center ", " transverse direction ", " longitudinal direction ", "front", "rear", "left", "right", " on ", D score, " vertical ", " level ", " top ", " bottom ", " interior ", the orientation of the instruction such as " outward " or position relationship be Based on orientation shown in the drawings or position relationship, it is for only for ease of and describes the present invention and simplify to describe, rather than instruction or dark Showing the device or element of meaning must have specific orientation, with specific azimuth configuration and operation therefore it is not intended that right The limitation of the scope of the present invention.
As shown in figure 1, controlling the structural representation of valve one embodiment for auxiliary of the present invention.With reference to Fig. 2, auxiliary control Valve 3 includes valve body, and the valve body is provided with switch valve 35, reversal valve 34 and return pressure control valve 33, wherein the switch valve 35 hydraulic fluid port is connected with the oil inlet P on the valve body, another hydraulic fluid port and the reversal valve 34 of the switch valve 35 Oil inlet connection, the switch valve 35 is used to control the break-make of main oil feeding line, and the reversal valve 34 is used for the valve body Commutation between at least two actuator ports, a hydraulic fluid port of the return pressure control valve 33 and the oil return of the reversal valve 34 Mouth connection, another hydraulic fluid port of the return pressure control valve 33 is connected with the oil return inlet T on the valve body, the return pressure Control valve 33 is used to controlling the size of return oil pressure, the return pressure control valve 33 without spring control chamber and the switch valve Connection oil communication between 35 and the reversal valve 34.
Auxiliary control valve in above-described embodiment controls valve by setting switch valve, reversal valve and return pressure so that when When switch valve is opened, oil inlet is connected by reversal valve with an actuator port on valve body on valve body, simultaneously because oil return pressure Force control valve without the connection oil communication between spring cavity and switch valve and reversal valve, from valve body oil inlet enter valve body in Hydraulic oil be partly into return pressure control valve without spring cavity so that return pressure control valve is opened, and hydraulic oil can be through Return pressure controls valve oil return box, and return oil pressure is smaller;When switch valve is closed, return pressure control valve without spring cavity pressure Reduce, return pressure control valve is closed, return oil pressure increase can effectively pin the part fluid on oil circuit.
In a preferred embodiment, the return pressure control valve 33 is the sequence valve with preset pressure, oil return Pressure-control valve 33 includes spring cavity and without spring cavity, and return pressure control valve 33 is provided with oil inlet and oil return opening, with reference to figure 2, when switch valve 35 is opened, a part of hydraulic oil by switch valve 35 enter return pressure control valve 33 without spring cavity, when When hydraulic oil runs up to the oil pressure without spring cavity more than spring cavity pressure (i.e. return pressure controls the preset pressure of valve), oil return pressure Force control valve 33 is opened, and its oil inlet is connected with oil return opening, and the hydraulic oil on such oil return circuit can be by return pressure control Valve 33 returns to fuel tank, and system oil return back pressure is smaller, is conducive to being lifted the luffing efficiency of auxiliary;When switch valve 35 is closed, oil return The hydraulic fluid pressure without spring cavity of pressure-control valve 33 diminishes, when the oil pressure without spring cavity is less than spring cavity pressure, oil return Pressure-control valve 33 is closed, and its oil inlet disconnects with oil return opening, and return oil pressure increase, the hydraulic oil on oil return circuit can not lead to again The return pressure control oil return box of valve 33 is crossed, but is lockable on oil return circuit so that when system is reworked, it is flat in system After weighing apparatus valve is opened, operating cylinder will not rapid decrease, it is to avoid cause danger.
Reversal valve 34 can be pilot operated directional control valve, or electric control reversing valve, it is preferable that the reversal valve 34 be with The three-position four-way electromagnetic directional valve of H type Median Functions, the Median Function of reversal valve 34 can avoid return pressure control from H types Valve 33 suppresses oil without spring cavity, prevents return pressure from controlling the valve 33 cannot to close, and then cannot pin the hydraulic pressure on oil return circuit Oil.
The actuator port of reversal valve 34 can according to actual needs set multiple, when with auxiliary control valve 3 be connected working oil When there is two or more on road, the actuator port of reversal valve 34 can select three with relative set two or more, such as reversal valve 34 Six-way transfer valve, the switching between three oil circuits of control.
In addition, auxiliary control valve 3 also includes overflow valve, at least two actuator ports being connected on the valve body and described Between oil return inlet T on valve body.The overflow valve can be configured as needed, as shown in figure 1, the first overflow valve 31 is located at valve On body between actuator port B and oil return inlet T, the second overflow valve 32 is located on valve body between actuator port A and oil return inlet T, respectively For the overflow of unnecessary hydraulic oil on correspondence oil circuit.
As shown in figure 1, in the present invention auxiliary control valve 3 one embodiment in can be by independent including being arranged at valve The first overflow valve 31 on body, the second overflow valve 32, return pressure control valve 33, reversal valve 34, switch valve 35, each valve can be with The surface of valve body is arranged at, oil circuit connection is carried out by mounting hole different on valve body, it is also possible to be arranged at the inside of valve body, group Into, it is also possible to each valve is integrated in valve body, multiple valve blocks are divided into equivalent to by auxiliary control valve 3, may be used also certainly To there is other connected modes, if principle it is identical and, the purpose of the present invention can be realized.
The luffing that auxiliary control valve 3 in the various embodiments described above can be not only used for auxiliary control system to control auxiliary is moved Make, can be also used for other hydraulic control systems, such as principal arm control system, steering control system or tipping bucket cylinder control system System etc., as long as need to realize that the system of the auxiliary control effect of valve 3 of the present invention is applicable.
Valve 3 is controlled based on above-mentioned auxiliary, the present invention proposes a kind of auxiliary hydraulic control system, as shown in Fig. 2 including above-mentioned The auxiliary control operating cylinder 6 of valve 3 and at least two, at least two actuator ports are respectively with described at least two on the valve body Operating cylinder 6 is connected, for controlling at least two operating cylinder 6 to perform the action stretched out or retract.
As shown in Fig. 2 being provided with piston rod in the embodiment in operating cylinder 6,6 points by operating cylinder of piston rod is rod chamber And rodless cavity, the hydraulic fluid port A on the auxiliary control valve body of valve 3 connects with the rodless cavity of two operating cylinders 6, and hydraulic fluid port B and two work The rod chamber connection of oil cylinder 6.In another embodiment, according to the difference of the internal structure of operating cylinder 6, auxiliary control valve 3 with There can also be other connected modes between operating cylinder 6.In fig. 2, when switch valve 35 is opened, the right position of reversal valve 34 is in During operating position, hydraulic oil through reversal valve 34, and by the hydraulic fluid port B on valve body enter operating cylinder 6 rod chamber, with hydraulic pressure The accumulation of oil, the piston rod of operating cylinder 6 withdraws, and auxiliary performs contractive action;When switch valve 35 is opened, the left position of reversal valve 34 During in operating position, hydraulic oil through reversal valve 34, and by the hydraulic fluid port A on valve body enter operating cylinder 6 rodless cavity, with The accumulation of hydraulic oil, the piston rod of operating cylinder 6 stretches out, and auxiliary performs extending action.
In a preferred embodiment, it is also connected between the auxiliary control valve 3 and at least two operating cylinder 6 There is a reel 4, the reel 4 can change the auxiliary control according to the flexible of at least two operating cylinder 6 The length of the connection oil circuit between valve processed 3 and at least two operating cylinder 6.
In auxiliary hydraulic system, kinetic pump 2 is typically mounted on turntable, operating cylinder 6 (generally amplitude oil cylinder) with Auxiliary connect, and auxiliary in crane arm head foremost, therefore kinetic pump 2 to operating cylinder 6 distant, the pressure loss Greatly.The connection rubber tube reel 4 between the auxiliary control operating cylinder 6 of valve 3 and at least two, hydralic hose is wrapped in one by reel Rise, during semi-girder, reel releases hydralic hose, during contracting arm, reel receives hydralic hose.When system stalls, in reel 4 The hydraulic oil of certain pressure can be remained with, when system is reworked, after the balanced valve of operating cylinder 6 is opened, operating cylinder Will not rapid decrease, it is to avoid cause danger.
In another embodiment, auxiliary hydraulic control system also includes balanced valve, at least two operating cylinder Play protection and locking, in system stalls, balanced valve can carry out locking to operating cylinder 6, prevent in-oil cylinder Piston rod rapid decrease.As shown in Fig. 2 be equipped with balanced valve in the rod chamber and rodless cavity of operating cylinder 6, balanced valve it is specific Structure type can be using existing structure type in the prior art, and the concrete structure of each balanced valve can be with identical, it is also possible to no Together, as long as can realize that it is acted on.
In embodiment as shown in Figure 2, the balanced valve set in operating cylinder 6 includes the in the small chamber of operating cylinder The concrete structure of one balanced valve 5 and the second balanced valve 8 in the big chamber of operating cylinder, the first balanced valve 5 and the second balanced valve 8 Have slightly different, but role is identical.Its action principle is:
When operating cylinder 6 stretches out, the pressure oil of kinetic pump 2 controls valve 3 by auxiliary, flows through A mouthfuls, and centre is by reel 4 connections, reach second balanced valve 8 in the big chamber of operating cylinder 6, and pressure oil reaches work by the check valve inside the second balanced valve 8 Make the big chamber of oil cylinder 6, now, due to X mouthfuls of the external control end connection pressure oil of the first balanced valve 5 of operating cylinder 6, with operating cylinder The pressure in 6 big chambers is communicated, so when A, B mouthful of the first balanced valve 5 throttling by internal 2/2-way reversal valve communicate, Fluid in the small chamber of operating cylinder 6 by the 2/2-way reversal valve inside the first balanced valve 5 throttling position oil return;
When operating cylinder 6 bounces back, the pressure oil of kinetic pump 2 controls valve 3 by auxiliary, flows through B mouthfuls, and centre is by reel 4 connections, reach first balanced valve 5 in the small chamber of operating cylinder 6, and pressure oil commutates by the 2/2-way inside the first balanced valve 5 The unidirectional reversal valve of valve, reaches the small chamber of operating cylinder 6, now, due to P mouthfuls of the external control end of the second balanced valve 8 of operating cylinder 6 Connection pressure oil, the pressure with the small chamber of operating cylinder 6 communicates, so when the second balanced valve 8 inside overflow valve opening, working oil Fluid in the big chamber of cylinder 6 is by the overflow valve oil return inside the second balanced valve 8.
Further, auxiliary hydraulic control system also includes pressure sensor 7, for detecting at least two working oil Pressure size in cylinder.As shown in Fig. 2 can set pressure sensor 7 in the rod chamber and rodless cavity of operating cylinder 6, press Force snesor 7 can be connected with the controller set in system, when pressure sensor 7 detects the corresponding control chamber of operating cylinder 6 When interior oil pressure is more than preset value, can disconnect controller controlling switch valve 35, make system stalls, it is to avoid operating cylinder 6 pressure are caused danger greatly very much.
In addition, insertion valve 9 can be provided between at least two operating cylinder 6, for keeping at least two work Make the synchronism between oil cylinder 6.Such as Fig. 2, by the insertion of insertion valve 9 between two rodless cavities and rodless cavity of operating cylinder 6, have Also by insertion valve insertion between rod cavity and rod chamber, to ensure the synchronism that two operating cylinders 6 are acted.
Insertion valve 9 is used for the insertion in the size chamber of operating cylinder 6 in Fig. 2, keeps synchronous, if there is insertion pipelines from bursting, May also operate as explosion-proof effect.By taking the insertion valve 9 connected with the big chamber of operating cylinder 6 as an example, specific work process is as follows:Work When oil cylinder 6 is operating normally, insertion valve 9 is constantly in pass-through state, keeps the fluid in two big chambers of operating cylinder 6 to communicate, so that Two flexible holding synchronizations of operating cylinder 6;If because of reasons such as scraped finishes, the pipeline of insertion ruptures suddenly, and now insertion valve 9 enters The pressure differential at fuel-displaced two ends is increased suddenly, and insertion valve 9 can be turning quickly back to end position, keep the pressure in operating cylinder 6, prevent Cause danger.
The present invention also proposes a kind of crane, including above-mentioned auxiliary control valve 3 or above-mentioned auxiliary hydraulic control system System.
An implementation with reference to Fig. 1 and Fig. 2 to auxiliary of the present invention control valve, auxiliary hydraulic control system and crane The course of work of example is illustrated:
As shown in figure 1, auxiliary control valve 3 includes the first overflow valve 31 and the second overflow valve 32, wherein the first overflow valve 31 Preset pressure can be set as 320bar, the preset pressure of the second overflow valve 32 can be set as 100bar.Overflow valve pressure Setting can according to load be determined with the area ratio of oil cylinder, in the annexation shown in Fig. 2, operating cylinder 6 retraction when, The small chamber oil-feed of operating cylinder 6, but because small cavity area is smaller, now load greatly, therefore the pressure of the first overflow valve 31 setting phase To higher;When operating cylinder 6 stretches out, the big chamber oil-feed of operating cylinder 6, but because big cavity area is big now loads that small (numerical value is Negative load), therefore the setting of the pressure of the second overflow valve 32 is relatively low.Certainly, in other embodiments, the connection of each structure is closed System is different, and the preset pressure of the first overflow valve 31 and the second overflow valve 32 can also have other to select, and magnitude relationship is not also limited It is formed on this.
Auxiliary control valve 3 also includes reversal valve 34 and switch valve 35, and wherein reversal valve 34 is used to control auxiliary amplitude oil cylinder It is flexible, switch valve 35 as reversal valve 34 pressure switch, when switch valve 35 it is electric after, reversal valve 34 can just reach control Purpose;After switch valve 35 is powered off, reversal valve 34 cannot realize the control of auxiliary.So can effectively prevent reversal valve 34 from missing Electricity causes auxiliary misoperation;If in addition, reversal valve 34 can cause its leakage larger using the structure type of guiding valve, and commutating Increase before valve 34 after switch valve 35 (switch valve 35 can use cone valve form), can prevent because of auxiliary luffing oil caused by leakage Cylinder misoperation, effectively improves the security of auxiliary control.
Auxiliary hydraulic control system as shown in Fig. 2 kinetic pump 2 give the system feed flow force feed, rolled up by auxiliary element sebific duct Cylinder 4, reaches the stepless luffing operating cylinder of executive component, and balanced valve is used to pin amplitude oil cylinder, and it is big that insertion valve 9 is used for amplitude oil cylinder The insertion in small chamber, keeps synchronous.
During the stepless luffing raising of auxiliary, the big chamber oil-feed of amplitude oil cylinder (i.e. operating cylinder 6), now switch valve 35 it is electric, change Obtain electric to the left position of valve 34, pressure oil reaches luffing through the right position of electric switch valve 35, the left position of reversal valve 34, centre by reel 4 The big chamber balanced valve of oil cylinder, into big chamber;The hydraulic oil in the small chamber of amplitude oil cylinder is arrived through too small chamber balanced valve by reel 4 Valve 3 is controlled up to auxiliary, because switch valve 35 obtains electric, the pilot control opening of return pressure control valve 33 is communicated with pressure oil port, is returned Oil pressure force control valve 33 is opened completely, and the small chamber hydraulic oil of amplitude oil cylinder returns to fuel tank 1 through return pressure control valve 33, now oil return Back pressure is smaller, luffing improved efficiency.
When the stepless luffing of auxiliary declines, the small chamber oil-feed of amplitude oil cylinder, now switch valve 35 must be electric, and the right position of reversal valve 34 obtains Electricity, pressure oil is balanced through the right position of switch valve 35, the right position of reversal valve 34, centre by the small chamber that reel 4 reaches amplitude oil cylinder Valve, into small chamber;The hydraulic oil in the big chamber of amplitude oil cylinder reaches auxiliary and controls valve 3 through excessive chamber balanced valve, by reel 4, Because switch valve 35 obtains electric, the pilot control opening of return pressure control valve 33 is communicated with pressure oil port, return pressure control valve 33 Open completely, the big chamber hydraulic oil of amplitude oil cylinder returns to fuel tank 1 through return pressure control valve 33, and now return oil pressure is smaller, luffing Improved efficiency.
During system stalls, the dead electricity of switch valve 35, in left position, the dead electricity of reversal valve 34, in middle position, now oil return pressure Force control valve 33 is closed, and oil return increased back pressure in system, it is ensured that hydraulic oil can be full of the fluid pressure line in reel 4;When When reworking, the rapid decrease of amplitude oil cylinder can be prevented, caused danger.
By controlling auxiliary of the present invention the explanation of multiple embodiments of valve, auxiliary hydraulic control system and crane, can To see that auxiliary control valve of the present invention, auxiliary hydraulic control system and crane embodiment at least this have the advantage that:Auxiliary control The integrated level of valve processed 3 is high, can reduce installing space, is applied to that in the system basic training such as system commutation, safeguard protection can be met Can, when system works, return pressure control valve 33 is opened, and effectively reduces return oil pressure, and through-flow diameter is big, greatly improves Auxiliary luffing operating efficiency;During system stalls, return pressure control valve 33 is closed, and oil return line has certain back pressure, effectively The fluid in reel is pinned, when reworking, the rapid decrease of amplitude oil cylinder can be prevented, caused danger.
Finally it should be noted that:The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations;To the greatest extent Pipe has been described in detail with reference to preferred embodiment to the present invention, and those of ordinary skill in the art should be understood:Still Specific embodiment of the invention can be modified or equivalent is carried out to some technical characteristics;Without deviating from this hair The spirit of bright technical scheme, it all should cover in the middle of claimed technical scheme scope of the invention.

Claims (10)

1. a kind of auxiliary controls valve (3), it is characterised in that including valve body, the valve body is provided with switch valve (35), reversal valve (34) and return pressure controls valve (33), wherein the oil inlet (P) on a hydraulic fluid port of the switch valve (35) and the valve body Connection, another hydraulic fluid port of the switch valve (35) is connected with the oil inlet of the reversal valve (34), and the switch valve (35) is used In the break-make for controlling main oil feeding line, the reversal valve (34) is for changing between at least two actuator ports on the valve body To a hydraulic fluid port of return pressure control valve (33) is connected with the oil return opening of the reversal valve (34), the return pressure Another hydraulic fluid port of control valve (33) is connected with the oil return opening (T) on the valve body, and return pressure control valve (33) is used for Control the size of return oil pressure, return pressure control valve (33) without spring control chamber and the switch valve (35) and described Connection oil communication between reversal valve (34).
2. auxiliary according to claim 1 controls valve (3), it is characterised in that it is tool that the return pressure controls valve (33) There is the sequence valve of preset pressure.
3. auxiliary according to claim 1 controls valve (3), it is characterised in that the reversal valve (34) is with H type middle positions The three-position four-way electromagnetic directional valve of function.
4. auxiliary according to claim 1 controls valve (3), it is characterised in that also including overflow valve, be connected to the valve body On at least two actuator ports and the valve body on oil return opening (T) between.
5. a kind of auxiliary hydraulic control system, it is characterised in that including the auxiliary control as described in any one of Claims 1 to 4 Valve (3) and at least two operating cylinders (6), on the valve body at least two actuator ports respectively with least two working oil Cylinder (6) is connected, for controlling at least two operating cylinder (6) to perform the action stretched out or retract.
6. auxiliary hydraulic control system according to claim 5, it is characterised in that the auxiliary control valve (3) with it is described Reel (4) is also associated between at least two operating cylinders (6), the reel (4) can be according to described at least two The flexible connection to change between auxiliary control valve (3) and at least two operating cylinder (6) of individual operating cylinder (6) The length of oil circuit.
7. auxiliary hydraulic control system according to claim 5, it is characterised in that also including balanced valve, to it is described at least Two operating cylinders play protection and locking.
8. auxiliary hydraulic control system according to claim 5, it is characterised in that also including pressure sensor (7), be used for Detect the pressure size at least two operating cylinder.
9. auxiliary hydraulic control system according to claim 5, it is characterised in that at least two operating cylinder (6) Between be provided with insertion valve (9), for keeping the synchronism between at least two operating cylinder (6).
10. a kind of crane, it is characterised in that including the auxiliary as described in any one of Claims 1 to 4 control valve (3) or Auxiliary hydraulic control system as described in any one of claim 5~9.
CN201510536651.7A 2015-08-27 2015-08-27 Auxiliary boom control valve, auxiliary boom hydraulic control system and crane Active CN105179356B (en)

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CN201510536651.7A CN105179356B (en) 2015-08-27 2015-08-27 Auxiliary boom control valve, auxiliary boom hydraulic control system and crane

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CN105179356B true CN105179356B (en) 2017-05-24

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CN114135529B (en) * 2021-12-09 2024-05-10 上海亿博机电设备有限公司 Double-oil-cylinder synchronous driving device and method for main arm support of ship unloader

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US4188790A (en) * 1974-02-21 1980-02-19 A/S Bergens Mekaniske Verksteder Hydraulic system for operation of a winch
DE29808049U1 (en) * 1998-05-06 1998-07-30 Loctite Deutschland GmbH, 81925 München Device for the path-dependent control of the force generated by a piston
JP2011016644A (en) * 2009-07-10 2011-01-27 Kobelco Cranes Co Ltd Hydraulic control device of construction machine
CN203529814U (en) * 2013-09-29 2014-04-09 徐州重型机械有限公司 Variable amplitude control system for fixed fly jib of crane
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