CN102434529B - Flexible control loop of hydraulic cylinder and engineering mechanical equipment - Google Patents
Flexible control loop of hydraulic cylinder and engineering mechanical equipment Download PDFInfo
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- CN102434529B CN102434529B CN201110399920.1A CN201110399920A CN102434529B CN 102434529 B CN102434529 B CN 102434529B CN 201110399920 A CN201110399920 A CN 201110399920A CN 102434529 B CN102434529 B CN 102434529B
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Abstract
The invention relates to a flexible control loop of a hydraulic cylinder. The flexible control loop of the hydraulic cylinder comprises an oil inlet path (13), an oil return path (14), a first working oil path (15), a second working oil path (16) and a main oil path steering valve (1) for realizing flexible control over the hydraulic cylinder (4), wherein the first working oil path (15) and the second working oil path (16) are respectively connected to a rod cavity and a rodless cavity of the hydraulic cylinder (4); and a switching valve for controlling the first working path (15) to open and close is connected to the first working oil path (15). Besides, the invention also provides engineering mechanical equipment provided with the flexible control loop of the hydraulic cylinder. According to the flexible control loop of hydraulic cylinder and the engineering mechanical equipment disclosed by the invention, by arranging the switching valve on the first control oil path, the first control oil path is controlled to open and close as required, a stroke locking function for preventing a stretching member of the hydraulic cylinder from continuously extending due to accidental means is effectively realized, and therefore working reliability of the hydraulic cylinder is ensured.
Description
Technical field
The present invention relates to a kind of cylinder hydraulic control system, particularly, relate to a kind of flexible control loop of hydraulic cylinder.In addition, the invention still further relates to a kind of engineering mechanical device with described flexible control loop of hydraulic cylinder.
Background technique
Hydraulic telescopic machanism in engineering mechanical device and other machinery adopts oil hydraulic cylinder as retractable driving device mostly.
Such as, with regard to hydraulic hoist, especially the hoist of large-tonnage or super-tonnage mostly is single cylinder single oil cylinder shrinking structure, wherein, via the working connection selector valve in flexible control loop of hydraulic cylinder to oil hydraulic cylinder fuel feeding to control its fore and aft motion, the extrusion of oil hydraulic cylinder can be measured by displacement transducer.When the telescoping member (such as cylinder barrel) of usual oil hydraulic cylinder moves to desired location (this position cylinder pin or arm pin are aimed at its pin-and-hole), namely oil hydraulic cylinder stops fore and aft motion, bolt mechanism carries out latch action under this oil hydraulic cylinder length, cylinder pin or arm pin to be inserted in pin-and-hole.
Shown in Figure 1, existing flexible control loop of hydraulic cylinder mainly comprises working connection selector valve 1 and equilibrium valve 3, wherein, working connection selector valve 1 generally adopts three position four-way directional control valve, its oil inlet P is connected to oil-feed oil circuit, oil outlet T is connected to oil return circuit, first actuator port A is connected to the first working oil path, second actuator port B is connected to the second working oil path, described first working oil path is connected to the rod chamber interface of oil hydraulic cylinder 4, and the second working oil path is connected to the rodless cavity of oil hydraulic cylinder 4 via equilibrium valve 3.Wherein, described oil hydraulic cylinder 4 has built-in core pipe 5, oil duct 6 centered by the tube chamber of this core pipe 5.
In the flexible control loop of hydraulic cylinder of above-mentioned prior art, when hydraulic cylinder is to stopping during desired location stretch (such as electric-controlled unit program desired location), then bolt mechanism starts to perform an action, and it is its fuel feeding that the action of bolt mechanism needs by the central oil passage 6 in the core pipe 5 in oil hydraulic cylinder.During central oil passage mineralization pressure fuel feeding, the pressure acted on core pipe 5 area makes cylinder barrel slightly stretch out, and causes oil hydraulic cylinder length to change, and so just causes cylinder pin, pin-and-hole position that arm pin has originally been aimed at when stretching out lost efficacy, cannot latch.
Particularly, current hydraulic telescopic machanism has following shortcoming when bolt mechanism action: when bolt mechanism action, if the pressure of the hydraulic oil of central passage is P, the external diameter of central passage core pipe is d, then the power acting on core pipe and end face thereof is: F=(π × d
2× P)/4, visible F to be directly proportional to pressure P and core pipe outside diameter d.If the piston rod of oil hydraulic cylinder is fixed end (hydraulic telescopic machanism on such as hydraulic hoist), cylinder barrel drives bolt mechanism to stretch, and core pipe is connected with cylinder barrel, and the power F therefore acted on core pipe can promote cylinder barrel and stretch out.The overall dimensions of its oil hydraulic cylinder of hoist that tonnage is larger is larger, and core pipe d is also larger.Oil hydraulic cylinder is when reality is stretched, when hydraulic cylinder extension is to precalculated position (cylinder pin or arm pin targeted by pin-and-hole), when preparing to stretch out cylinder pin or arm pin, this directed force F can promote cylinder barrel simultaneously stretch out, therefore losing efficacy in the pin-and-hole position that cylinder pin and arm pin are aimed at, cannot latch.When bolt mechanism action, often there is above-mentioned fault, cause system reliability to reduce in current telescopic system.
In view of this, need to design a kind of flexible control loop of hydraulic cylinder, to realize the stroke latch functions of oil hydraulic cylinder, because accidental cause stretches out when particularly preventing the telescoping member of oil hydraulic cylinder from stopping at a certain working position.
Summary of the invention
The technical problem that first the present invention will solve is to provide a kind of flexible control loop of hydraulic cylinder, when this flexible control loop of hydraulic cylinder stops at a certain working position because operation needs in hydraulic cylinder extension process, effectively can realize preventing the extension member of oil hydraulic cylinder (such as cylinder barrel) from continuing the stroke latch functions of stretching out because of accidental cause, thus guarantee hydraulic cylinder works reliability.
In addition, the present invention also will provide a kind of engineering mechanical device, and the hydraulic telescopic machanism of this project machinery has above-mentioned stroke latch functions, thus has good functional reliability.
In order to solve the problems of the technologies described above, the invention provides a kind of flexible control loop of hydraulic cylinder, comprise and be connected to oil-feed oil circuit, oil return circuit, the first working oil path and the second working oil path for the working connection selector valve realizing hydraulic cylinder extension control, described first working oil path and the second working oil path are connected to rod chamber and the rodless cavity of described oil hydraulic cylinder, wherein, described first working oil path is connected with the switch valve for controlling this first working oil path break-make.
Preferably, described switch valve is stroke lock valve, the trip lock valve comprises fluid-controlled cut-off valve, shuttle valve and oil circuit control selector valve, described fluid-controlled cut-off valve have with the first hydraulic fluid port of the first inlet communication of described shuttle valve, with the second hydraulic fluid port of the second inlet communication of this shuttle valve and oil circuit control interface; The first paragraph of described first working oil path is connected between described first hydraulic fluid port and described working connection selector valve, and second segment is connected between described second hydraulic fluid port and the rod chamber of described oil hydraulic cylinder; Described oil circuit control selector valve connects for controlling described oil circuit control interface optionally with the outlet of described shuttle valve or be communicated with fuel tank; Described fluid-controlled cut-off valve makes described first hydraulic fluid port and the second hydraulic fluid port block each other when described oil circuit control interface has hydraulic oil input transmission of pressure, when described first hydraulic fluid port or the second hydraulic fluid port have hydraulic oil input transmission of pressure and described oil circuit control interface is communicated with fuel tank, described first hydraulic fluid port and the second hydraulic fluid port is communicated with each other.
Preferably, slide in the valve pocket of described fluid-controlled cut-off valve and be provided with spool, this spool is formed with the second spool part that the first spool part and diameter are less than this first spool part, described valve pocket is divided into the spring chamber of turnover oil pocket and the hydraulic control orifice with this fluid-controlled cut-off valve by described first spool part sealing, described turnover oil pocket has conical cavity part, the spring of spool described in bias voltage is provided with in described spring chamber, described second spool part forms sealing linear contact lay with the taper inner circle wall of described conical cavity part under the effect of described spring, this turnover oil pocket to be divided into the first oil pocket be communicated with described first hydraulic fluid port and the second oil pocket be communicated with described second hydraulic fluid port.
Concrete selectively described fluid-controlled cut-off valve also comprises the 3rd hydraulic fluid port be communicated with described second oil pocket, and described second hydraulic fluid port passes through the second inlet communication of the 3rd hydraulic fluid port and described shuttle valve.
Preferably, described oil circuit control selector valve is electromagnetism two position three way directional control valve.
Preferably, be also parallel with relief valve between the first hydraulic fluid port of described fluid-controlled cut-off valve and the second hydraulic fluid port, the inlet opening of this relief valve is communicated with the rod chamber of described oil hydraulic cylinder.
Selectively, described switch valve can also be electromagnetic switch valve or electromagnetism bi-bit bi-pass selector valve.
Preferably, described switch valve is also parallel with relief valve, and the inlet opening of this relief valve is communicated with the rod chamber of described oil hydraulic cylinder.
Preferably, described second working oil path is also provided with equilibrium valve, the hydraulic control interface of this equilibrium valve is connected in described first working oil path between described working connection selector valve and described switch valve by hydraulic control oil circuit, described hydraulic control oil circuit is provided with oil purifier, and described working connection selector valve is guide's hyraulic controlled type Y type three position four-way directional control valve.
On the basis of the technological scheme of above-mentioned flexible control loop of hydraulic cylinder, the present invention also will provide a kind of engineering mechanical device, this project machinery comprises hydraulic telescopic machanism, and wherein, described hydraulic telescopic machanism has the flexible control loop of hydraulic cylinder according to any one of technique scheme.
Particularly, the axis that the center of described oil hydraulic cylinder is provided with along this oil hydraulic cylinder runs through described piston rod and is connected to the core pipe of the cylinder barrel of this oil hydraulic cylinder, has central oil passage in this core pipe.
Specifically selectively, described engineering mechanical device is hydraulic hoist, and described hydraulic telescopic machanism is the telescoping boom of this hydraulic hoist.
Pass through technique scheme, flexible control loop of hydraulic cylinder of the present invention and engineering mechanical device thereof by arranging switch valve on the first oil circuit control, thus the break-make of the first oil circuit control can be controlled as required, when oil hydraulic cylinder stops at a certain working position because operation needs in telescopic process, by the first oil circuit control is disconnected, can effectively realize preventing the extension member of oil hydraulic cylinder (such as cylinder barrel) from continuing the stroke latch functions of stretching out because of accidental cause, thus guarantee hydraulic cylinder works reliability, which solve the oil hydraulic cylinder defect that the oil hydraulic cylinder that causes stretches out because central oil passage builds pressure or other accidental cause, relatively reliably achieve the static latch functions of oil hydraulic cylinder, especially the latch functions that the extension member of oil hydraulic cylinder stretches out is prevented.Meanwhile, the preferred embodiment for the present invention provides a kind of flexible control loop of hydraulic cylinder using stroke lock valve as switch valve further, thus makes control more light sensitive, handles more accurately reliable.In addition, flexible control loop of hydraulic cylinder of the present invention preferably can also arrange relief valve, and it achieves the pressure protecting function to oil hydraulic cylinder under some fortuitous event, improves the safety reliability of system.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Following accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, and itself and following embodiment one are used from explanation the present invention, but protection scope of the present invention is not limited to following the drawings and the specific embodiments.In the accompanying drawings:
Fig. 1 is the schematic diagram of the flexible control loop of hydraulic cylinder of prior art;
Fig. 2 is the schematic diagram of the flexible control loop of hydraulic cylinder of the specific embodiment of the invention, wherein said flexible control loop of hydraulic cylinder is connected with stroke lock valve.
Description of reference numerals:
1 working connection selector valve; 2 stroke lock valves;
3 equilibrium valves; 4 oil hydraulic cylinders;
5 core pipes; 6 central oil passages;
7 relief valves; 8 fluid-controlled cut-off valve;
9 solenoid directional control valves; 10 shuttle valves;
11 spools; 12 conical cavity parts;
13 oil-feed oil circuits; 14 oil return circuits;
15 first working oil path; 16 second working oil path;
17 hydraulic control oil circuits; 18 spring chambers;
19 first oil pockets; 20 second oil pockets;
A first actuator port; B second actuator port;
C first import; D second import;
E first hydraulic fluid port; F second hydraulic fluid port;
H hydraulic control oil circuit tie point; I exports;
P filler opening; Pz central oil passage filler opening;
T oil outlet; Tz central oil passage oil outlet;
X the 3rd hydraulic fluid port.
Embodiment
Be described in detail to the specific embodiment of the present invention below in conjunction with accompanying drawing, should be understood that, embodiment described herein is only for instruction and explanation of the present invention, and protection scope of the present invention is not limited to following embodiment.
First it should be noted that, flexible control loop of hydraulic cylinder of the present invention belongs to Hydraulic Field, and its substantive technical conceive is hydraulic connecting relation, and does not lie in concrete mechanical structure.Such as; with regard to the stroke lock valve adopted in flexible control loop of hydraulic cylinder of the present invention; should be understood it from the hydraulic principle of broad sense to form; and should not be confined to the concrete form that shows in accompanying drawing; namely each valve both can connect via corresponding pipeline according to shown in Fig. 2 by stroke lock valve of the present invention; also the integrated type stroke lock valve with shared valve body can be formed as; no matter its mechanical structure how modification; as long as it is identical or similar with the hydraulic connecting principle of stroke lock valve of the present invention, it all belongs to protection scope of the present invention.
The embodiment of stroke lock valve of the present invention is described referring to Fig. 2.
As shown in Figure 2, flexible control loop of hydraulic cylinder of the present invention, comprise and be connected to oil-feed oil circuit 13, oil return circuit 14, first working oil path 15 and the second working oil path 16 are connected to oil hydraulic cylinder 4 rod chamber and rodless cavity for working connection selector valve 1, first working oil path 15 and the second working oil path 16 that realize oil hydraulic cylinder 4 extension and contraction control.Particularly, working connection switching valve 1 can adopt multiple selector valve, generally three position four-way directional control valve is adopted in flexible control loop of hydraulic cylinder, working connection selector valve 1 shown in Fig. 2 is guide's hyraulic controlled type Y type three position four-way directional control valve, wherein oil-feed oil circuit 13 is connected to the oil inlet P of working connection selector valve 1, oil return circuit 14 connects its oil return inlet T, first working oil path 16 is connected to its first actuator port A, second working oil path 17 is connected to its second actuator port B, thus realizes the commutation of the extension and contraction control oil circuit of oil hydraulic cylinder.Certainly, for the technician of Hydraulic Field, working connection selector valve 1 can adopt various known selector valve, and this is known in flexible control loop of hydraulic cylinder, repeats no more this.
Unlike the prior art, the first working oil path 15 is connected with the switch valve for controlling this first working oil path 15 break-make.By arranging switch valve on the first oil circuit control 15, thus the break-make of the first oil circuit control 15 can be controlled as required, when oil hydraulic cylinder stops at a certain working position because operation needs in telescopic process, by the first oil circuit control 15 is disconnected, can effectively realize preventing the extension member of oil hydraulic cylinder 4 (such as cylinder barrel) from continuing the stroke latch functions of stretching out because of accidental cause, thus guarantee hydraulic cylinder works reliability, particularly, because the first working oil path 15 being connected to the rod chamber of oil hydraulic cylinder 4 is disconnected by switch valve, the rod chamber of oil hydraulic cylinder 4 cannot oil return, therefore the cylinder barrel of oil hydraulic cylinder 4 cannot action, cylinder barrel (or piston rod) cannot stretch out.In addition, when the cylinder barrel of oil hydraulic cylinder 4 has retraction trend, because the first working oil path 15 being connected to the rod chamber of oil hydraulic cylinder 4 is disconnected by switch valve, the rod chamber of oil hydraulic cylinder 4 cannot obtain hydraulic oil, if cylinder barrel is retracted, larger negative pressure can be formed in the rod chamber of oil hydraulic cylinder 4, cylinder barrel therefore also can be stoped to a certain extent to retract, thus achieve the stroke latch functions of oil hydraulic cylinder 4.Such as, the oil hydraulic cylinder control loop of the hydraulic telescopic arm for hydraulic hoist shown in Fig. 2, the axis that wherein center of oil hydraulic cylinder 4 is provided with along this oil hydraulic cylinder runs through piston rod and is connected to the core pipe 5 of the cylinder barrel of this oil hydraulic cylinder, there is in this core pipe 5 central oil passage 6 for driving bolt mechanism, central oil passage oil inlet P z is arranged on fixing piston rod, central oil passage oil outlet Tz is arranged on cylinder barrel, when needs latch, the hydraulic oil entered by the central oil passage oil inlet P z hydraulic oil acted on the end face of core pipe 5 can drive the cylinder barrel of oil hydraulic cylinder 4 (piston rod of this oil hydraulic cylinder 4 is fixed) to continue to stretch out, thus the action that the cylinder barrel solving the oil hydraulic cylinder that the oil hydraulic cylinder with central passage causes when central oil passage builds pressure stretches out, achieve the static latch functions of oil hydraulic cylinder, in addition, flexible control loop of hydraulic cylinder of the present invention is also not limited to be applied to the oil hydraulic cylinder with central oil passage, and it can be applicable to the stroke locking of various types of oil hydraulic cylinder.When oil hydraulic cylinder due to hydraulically extensible control mechanism can stop at a certain working position because operation needs in telescopic process, it may cause the extension member mobile position of oil hydraulic cylinder because of multiple external cause, above-mentioned hydraulically extensible control loop of the present invention all can be suitable for and realize the object of stroke locking.
Above-mentioned switch valve can also adopt multiple can the hydrovalve of oil circuit control break-make, such as electromagnetic switch valve or electromagnetism bi-bit bi-pass selector valve.In addition, damage the rod chamber of oil hydraulic cylinder 4 under situation to prevent switch valve and damage because oil pressure is excessive, preferably, switch valve can also be parallel with relief valve 7, and the inlet opening of this relief valve 7 is communicated with the rod chamber of oil hydraulic cylinder 4.
It should be noted that at this, although adopt common switch valve substantially can realize above-mentioned purpose of the present invention to the greatest extent, but due to common switch valve be applied on engineering mechanical device time, such as hydraulic hoist, because the load of engineering mechanical device is usually very large, if adopt common switch valve, the reaction of these switch valves is sensitive not,, also usually there is the problems such as leakage of oil in operating difficulties.For this reason, flexible control loop of hydraulic cylinder of the present invention adopts a kind of stroke lock valve 2 of unique hydraulic connecting structure, the trip lock valve can realize pressure feedback by means of the oil pressure on the first oil circuit control 15 and control the break-make of the first oil circuit control 15, thus only need arrange the object that oil circuit control selector valve can realize control first oil circuit control 15 break-make easily on this corresponding oil circuit control.
Particularly, shown in Figure 2, flexible control loop of hydraulic cylinder of the present invention adopts stroke lock valve 2 as switch valve, wherein the first working oil path 15 (being namely connected to the working oil path of the rod chamber interface of oil hydraulic cylinder 4) is connected to the rod chamber of oil hydraulic cylinder 4 via stroke lock valve 2, the trip lock valve 2 comprises fluid-controlled cut-off valve 8, shuttle valve 10 and oil circuit control selector valve, fluid-controlled cut-off valve 8 has the first hydraulic fluid port E be communicated with the first import C of shuttle valve 10, the the second hydraulic fluid port F (in Fig. 2, the second hydraulic fluid port F is communicated with the second import D of shuttle valve 10 by the 3rd hydraulic fluid port X) be communicated with the second import D of this shuttle valve 10, and oil circuit control interface, the first paragraph of the first working oil path 15 is connected between the first hydraulic fluid port E and working connection selector valve 1, and second segment is connected between the second hydraulic fluid port F and the rod chamber of oil hydraulic cylinder 4.
Oil circuit control selector valve connects and is optionally communicated with the outlet I of shuttle valve 10 for controlling oil circuit control interface or is communicated with fuel tank, this is to those skilled in the art by selector valve and to connect via corresponding pipeline be easily realize, preferably, conveniently control, oil circuit control selector valve is solenoid directional control valve 9, specifically selectively, oil circuit control selector valve is electromagnetism two position three way directional control valve, pipeline is by the oil circuit control interface of fluid-controlled cut-off valve 8 simultaneously, the outlet I of shuttle valve 10 and fuel tank are connected respectively on three interfaces of electromagnetism two position three way directional control valve, conveniently can realize the commutation of oil circuit control.
On the basis of above-mentioned hydraulic fluid port connected relation, fluid-controlled cut-off valve 8 makes the first hydraulic fluid port E and the second hydraulic fluid port F block each other when oil circuit control interface has hydraulic oil input transmission of pressure, when the first hydraulic fluid port E or the second hydraulic fluid port F has hydraulic oil input transmission of pressure and oil circuit control interface is communicated with fuel tank, the first hydraulic fluid port E and the second hydraulic fluid port F is communicated with each other.Apparently, due to the hydraulic oil (i.e. same oil sources) of the same uniform pressure that oil circuit control interface and the first hydraulic fluid port E or the second hydraulic fluid port F of fluid-controlled cut-off valve 8 adopt, fluid-controlled cut-off valve 8 will realize above-mentioned functions, general needs are realized by the area ratio of the corresponding hydraulic oil acting surface arranging its inner spool 11, and this can design various concrete fluid-controlled cut-off valve 8 internal structure for those skilled in the art.
As the selectable specific implementation form of one, shown in Figure 2, slide in the valve pocket of fluid-controlled cut-off valve 8 and be provided with spool 11, this spool is formed with the second spool part that the first interconnected spool part and diameter are less than this first spool part, valve pocket is divided into the spring chamber 18 of turnover oil pocket and the hydraulic control orifice with this fluid-controlled cut-off valve 8 by the first spool part sealing, turnover oil pocket has conical cavity part 12, the spring of bias voltage spool 11 is provided with in spring chamber 18, second spool part forms sealing linear contact lay with the taper inner circle wall of conical cavity part 12 under the action of the spring, this turnover oil pocket to be divided into the first oil pocket 19 be communicated with the first hydraulic fluid port E and the second oil pocket 20 be communicated with the second hydraulic fluid port F.Apparently, because the hydraulic oil active area of spool 11 in spring chamber 18 is greater than the hydraulic oil active area of spool 11 in the first oil pocket 19 and the second oil pocket 20, therefore fluid-controlled cut-off valve 8 can realize above-mentioned selectivity and makes the taper inner circle wall of the second spool part and conical cavity part 12 form sealing linear contact lay or disengage, thus controls the break-make (referring to job analysis hereafter) of the first hydraulic fluid port E and the second hydraulic fluid port F.Because this fluid-controlled cut-off valve 8 realizes hydraulic control by means of the hydraulic oil in the first working oil path 15, realize controlling object by comparing the pressure difference acted on spool 11, therefore spring can adopt light and handy spring, and because the general hydraulic fluid flow rate of oil circuit control is little, only need connect small-sized selector valve at the outlet I of the oil circuit control interface of fluid-controlled cut-off valve 8, fuel tank, shuttle valve 10 can realize controlling object, therefore control light sensitive.
Specifically selectively, fluid-controlled cut-off valve 8 also comprises the 3rd hydraulic fluid port X (bore of the 3rd hydraulic fluid port X can arrange be less than the first hydraulic fluid port E as actuator port and the second hydraulic fluid port F) be communicated with the second oil pocket 20, and the second hydraulic fluid port F is communicated with the second import D of shuttle valve 10 by the 3rd hydraulic fluid port X.
With switch valve adopt the valve of other type can relief valve 7 in parallel similar, stroke lock valve 2 also can relief valve 7 in parallel, particularly, be also parallel with relief valve 7 between the first hydraulic fluid port E of fluid-controlled cut-off valve 8 and the second hydraulic fluid port F, the inlet opening of this relief valve 7 is communicated with the rod chamber of oil hydraulic cylinder 4.
In addition, adopt oil hydraulic cylinders as drive unit and the larger hydraulic telescopic machanism of lifting weight or lifting mechanism for some, the hydraulic telescopic arm of such as hoist, declines in order to telescopic boom plays hypervelocity in load operation process, is also provided with equilibrium valve 3 in described flexible control loop of hydraulic cylinder.The equilibrium valve 3 adopted in flexible control loop of hydraulic cylinder is known valve, and equilibrium valve is the equilibrium valve that external control sequence valve and one-way valve are formed in parallel the most simply, and the equilibrium valve that certain engineering uses is custom-designed equilibrium valve, but structural principle basic simlarity.Equilibrium valve 3 generally comprises forward hydraulic fluid port and reverse hydraulic fluid port (those skilled in the art are also referred to as " input hydraulic fluid port " and " output oil port "), wherein forward hydraulic fluid port is not by the hydraulic fluid port be communicated with the forward conduction port of the one-way valve of this equilibrium valve inside under hydraulic control oil circuit state of a control at equilibrium valve, reverse hydraulic fluid port is not by the hydraulic fluid port be communicated with the reverse-conducting port of the one-way valve of its inside under hydraulic control oil circuit state of a control at equilibrium valve, carrying out hydraulic control to equilibrium valve mainly makes the valve opening of the sequence valve character in parallel with one-way valve to realize oil return when the rod chamber oil return of oil hydraulic cylinder 4.Equilibrium valve mainly plays the effect of decline speed limit, and namely equilibrium valve 3 makes oil hydraulic cylinder 4 hourly velocity that bounces back steadily controlled, and prevents the telescoping member of oil hydraulic cylinder from automatically gliding under induced pressure when stopping at a certain position in hydraulic cylinder works process.Particularly, second working oil path 16 is connected to the rodless cavity of oil hydraulic cylinder 4 via equilibrium valve 3, namely equilibrium valve 3 is connected in described second working oil path 16 (being namely connected to the working oil path of the rodless cavity of oil hydraulic cylinder 4), wherein the forward hydraulic fluid port of equilibrium valve 3 is communicated with the actuator port being connected to the second working oil path 16 of described working connection selector valve 1, and reverse hydraulic fluid port is communicated with the rodless cavity of described oil hydraulic cylinder 4.In addition, the hydraulic control interface of this equilibrium valve 3 is connected in the first working oil path 15 by hydraulic control oil circuit 17, and particularly, the hydraulic control interface of this equilibrium valve 3 is connected on the first oil circuit control 15 between working connection selector valve 1 and switch valve by hydraulic control oil circuit 17.In order to prevent damaging equilibrium valve 3 containing impurity in hydraulic control oil, described hydraulic control oil circuit 17 being also provided with oil purifier 18, filtering before entering equilibrium valve 3 with hydraulic control oil.In fig. 2, equilibrium valve 3 is cartridge balanced valve, and it is arranged on the end of the piston rod of oil hydraulic cylinder 4, and its reverse hydraulic fluid port is communicated with the rodless cavity of oil hydraulic cylinder 4.
On the basis of the technological scheme of above-mentioned flexible control loop of hydraulic cylinder, the present invention also will provide a kind of engineering mechanical device, and this project machinery comprises hydraulic telescopic machanism, and wherein, hydraulic telescopic machanism has above-mentioned hydraulic cylinder extension cylinder control loop.Apparently, this project machinery typically is hydraulic hoist, and hydraulic telescopic machanism is the telescoping boom of this hydraulic hoist.
Above composition graphs 2 describes the basic embodiment of flexible control loop of hydraulic cylinder, preferred implementation and corresponding simple deformation mode.Below mainly with reference to working state and the corresponding working procedure of the corresponding hydraulic element of the flexible control loop of hydraulic cylinder of the preferred embodiment for the present invention shown in Fig. 2, to help skilled in the art to understand technological scheme of the present invention.To fix for the piston rod of oil hydraulic cylinder 4 in the following description and cylinder barrel carries out fore and aft motion analyzes.
As mentioned above, working connection switching valve 1 can adopt multiple selector valve, such as three six-way transfer valves etc., and when being employing three six-way transfer valves, some hydraulic fluid ports are without the need to using.In fig. 2, working connection selector valve 1 preferably adopts Y type three position four-way directional control valve, it has three working staties (namely the valve rod of working connection selector valve 1 has three working positions): the first working state is positioned at meta, oil inlet P is ended, and the first actuator port A of working connection selector valve 1 and the second actuator port B communicates (i.e. so-called Y type Median Function) simultaneously with oil return inlet T; Second working state is positioned at left position, and oil inlet P is communicated with the first actuator port A of working connection selector valve 1, and the second actuator port B of working connection selector valve 1 is communicated with oil return inlet T; 3rd working state is positioned at right position, and oil inlet P is communicated with the second actuator port B of working connection selector valve 1, and the first actuator port A of working connection selector valve 1 communicates with oil return inlet T.
Stroke lock valve 2 has three working staties: make to end between the rodless cavity of oil hydraulic cylinder 4 and the first actuator port A; Make to realize pressurized overflow between the rodless cavity of oil hydraulic cylinder 4 and the first actuator port A; And make conducting between the rodless cavity of oil hydraulic cylinder 4 and the first actuator port A.Specific as follows:
First, when solenoid directional control valve 9 proportion electro-magnet Y1 not electric time, the valve rod of solenoid directional control valve 9 is in the first working position (i.e. normality working position), and the spring chamber of fluid-controlled cut-off valve 8 is communicated with the delivery outlet I of shuttle valve 10 by solenoid directional control valve 9 in this case.If when now the first actuator port A of working connection selector valve 1 or the rod chamber of oil hydraulic cylinder 4 are without high pressure liquid force feed, then fluid-controlled cut-off valve 8 is closed by the spool of fluid-controlled cut-off valve 8 under spring force, namely fluid-controlled cut-off valve 8 is normally off, ends between the rod chamber of oil hydraulic cylinder 4 and the first actuator port A; if the hydraulic oil that now the first actuator port A of working connection selector valve 1 or the rod chamber of oil hydraulic cylinder 4 have a certain pressure (such as passes through the first actuator port A to the first working oil path 15 fuel feeding because of misoperation, or the cylinder barrel of oil hydraulic cylinder 4 is because such as acting on the pressure of core pipe 5 end face shown in Fig. 2 and having the trend of stretching out and compress the hydraulic oil in rod chamber), but the oil pressure of this hydraulic oil is less than the setting pressure of relief valve 7, as shown in Figure 2, hydraulic oil can act on the lower end surface (i.e. the first oil pocket acting surface or the second oil pocket acting surface) of the spool of fluid-controlled cut-off valve 8, but this hydraulic oil can act on the upper-end surface (i.e. spring chamber acting surface) of the valve rod of fluid-controlled cut-off valve 8 in the spring chamber of fluid-controlled cut-off valve 8 by shuttle valve 10 via the 3rd hydraulic fluid port X of fluid-controlled cut-off valve 8 simultaneously, area because of the spring chamber acting surface of the spool of fluid-controlled cut-off valve 8 is greater than the area of the lower end surface (i.e. the first oil pocket acting surface or the second oil pocket acting surface) of its spool, therefore fluid-controlled cut-off valve still keeps closed condition, end between the rod chamber of oil hydraulic cylinder 4 and the first actuator port A.
Second, if the electromagnet Y1 of solenoid directional control valve 9 not electric, and the rod chamber of oil hydraulic cylinder 4 has the hydraulic oil of elevated pressures, the pressure of this hydraulic oil is greater than the oil pressure relief of relief valve 7, then fluid-controlled cut-off valve 8 still remain off state, hydraulic oil in the rod chamber of simultaneously oil hydraulic cylinder 4 will overflow to the first actuator port A by relief valve 7, realize the high pressure kicks between the rod chamber of oil hydraulic cylinder 4 and the first actuator port A.
3rd, when the electromagnet Y1 of solenoid directional control valve 9 obtains electric, the valve rod of solenoid directional control valve 9 is in the second working position, and now the spring chamber of fluid-controlled cut-off valve 8 is by solenoid directional control valve 9 and fuel tank or oil return circuit conducting.If have the hydraulic oil of certain pressure in the rod chamber of now the first actuator port A or oil hydraulic cylinder 4, then (i.e. (i.e. the first oil pocket acting surface or the second oil pocket acting surface) this hydraulic oil can act on the lower end surface of the spool of fluid-controlled cut-off valve 8, and overcome spring force fluid-controlled cut-off valve 8 is opened, conducting between the rod chamber of oil hydraulic cylinder 4 and the first actuator port A.
The conventional fore and aft motion (wherein fixing for the piston rod of oil hydraulic cylinder 4 and cylinder barrel carries out fore and aft motion) of the oil hydraulic cylinder 4 that lower surface analysis flexible control loop of hydraulic cylinder of the present invention realizes:
One, the cylinder barrel of oil hydraulic cylinder 4 realizes retract action, and wherein the valve rod driving electromagnet Y1 of solenoid directional control valve 9 obtains electric:
Working connection selector valve 1 is in the second working state in this case, via the hydraulic oil in oil-feed 13 and the first actuator port A conducting, first actuator port A enters into the hydraulic oil in the first working oil path 15 and acts on the first oil pocket acting surface of the spool of fluid-controlled cut-off valve 8 via the first hydraulic fluid port E of fluid-controlled cut-off valve 8, thus open fluid-controlled cut-off valve 8, enter into the rod chamber of oil hydraulic cylinder 4, therefore system liquid force feed enters the rod chamber of oil hydraulic cylinder 4, promote oil hydraulic cylinder 4 to bounce back, hydraulic oil simultaneously in the first working oil path 15 acts on equilibrium valve 3 via hydraulic control oil circuit 17, equilibrium valve 3 is opened, hydraulic oil in the rodless cavity of oil hydraulic cylinder 4 arrives the second actuator port B of working connection selector valve 1 through equilibrium valve 3, and flow back to fuel tank through working connection selector valve 1 by oil return circuit 14 from the second actuator port B, thus realize retract action.
Its two, the cylinder barrel of oil hydraulic cylinder 4 realizes extend action, and wherein the electromagnet Y1 of solenoid directional control valve 9 obtains electric:
In this working procedure, working connection selector valve 1 is in the 3rd working state, hydraulic oil on oil-feed oil circuit 13 and the second actuator port B conducting, and enter oil hydraulic cylinder rodless cavity from the second actuator port B through equilibrium valve 3, the cylinder barrel promoting oil hydraulic cylinder 4 stretches out, because the solenoid directional control valve 9 of stroke lock valve 2 obtains electric, the rod chamber of oil hydraulic cylinder 4 is via fluid-controlled cut-off valve 8 and the first actuator port A oil circuit conducting, in rod chamber, the first actuator port A of working connection selector valve 1 got back to by hydraulic oil through stroke lock valve 2, and from the first actuator port A through working connection selector valve 1 oil sump tank.
Can learn when oil hydraulic cylinder 4 stretches out or bounces back from upper surface analysis, need to make the electromagnet Y1 of solenoid directional control valve 9 simultaneously electric, the electromagnetic valve work of stroke lock valve is in the second working state, and the road conducting of stroke locking valve oil, achieves conventional expanding-contracting action.
Except above-mentioned functions, flexible control loop of hydraulic cylinder of the present invention also has oil hydraulic cylinder 4 stroke latch functions.Lower surface analysis moving lock stops the stroke latch functions of valve to oil hydraulic cylinder 4, wherein the electromagnet Y1 of solenoid directional control valve 9 not electric, namely the valve rod of solenoid directional control valve 9 is in the normal state working position:
In this case, due to solenoid directional control valve not electric, stroke lock valve is in cut-off working state, when a certain position of oil hydraulic cylinder 4 in telescopic process stops because operation needs, if make the cylinder barrel of oil hydraulic cylinder 4 have the trend of stretching out because of some reasons, such as, when on the telescopic boom that flexible control loop of hydraulic cylinder of the present invention is applied in hydraulic hoist, reach setting working position when telescopic boom and make arm pin and pin-and-hole on time, when bolt mechanism action, act on the action trend that the directed force F on the end face of the core pipe 5 forming central oil passage 6 can make the cylinder barrel of oil hydraulic cylinder 4 have to stretch out.The spool of the fluid-controlled cut-off valve 8 in stroke lock valve is in the closed position, now due to the extend action trend of oil hydraulic cylinder 4, the hydraulic oil of rod chamber can be caused to act on the second oil pocket acting surface of the spool of fluid-controlled cut-off valve 8, the spool of fluid-controlled cut-off valve 8 has the trend moving upward and open under this promotes, but the hydraulic oil in the rod chamber of oil hydraulic cylinder 4 simultaneously can act on rapidly on the spring chamber acting surface of the spool of fluid-controlled cut-off valve 8 via the 3rd hydraulic fluid port X of fluid-controlled cut-off valve 8, shuttle valve 10, solenoid directional control valve 9.The area of the spring chamber effect end of the spool of fluid-controlled cut-off valve 8 is greater than the second oil pocket acting surface area, and therefore fluid-controlled cut-off valve 8 keeps non-opening state.The first working oil path 15 being connected to the rod chamber of oil hydraulic cylinder 4 is disconnected by fluid-controlled cut-off valve 8, and the rod chamber of oil hydraulic cylinder 4 cannot oil return, and therefore the cylinder barrel of oil hydraulic cylinder 4 cannot action, and cylinder barrel cannot stretch out.In addition, when the cylinder barrel of oil hydraulic cylinder 4 has retraction trend, because the first working oil path 15 being connected to the rod chamber of oil hydraulic cylinder 4 is disconnected by fluid-controlled cut-off valve 8, the rod chamber of oil hydraulic cylinder 4 cannot obtain hydraulic oil, if cylinder barrel is retracted, larger negative pressure can be formed in the rod chamber of oil hydraulic cylinder 4, cylinder barrel therefore also can be stoped to a certain extent to retract, thus achieve the stroke latch functions of oil hydraulic cylinder 4.Certainly, in the hydraulic telescopic machanism of heavier loads, the telescopic boom of such as hydraulic hoist, the retraction locking of cylinder barrel generally can be realized by equilibrium valve 3.
Fix for the piston rod of oil hydraulic cylinder above and cylinder barrel motion analyze, the cylinder barrel of oil hydraulic cylinder 4 fix and piston rod movement when its working procedure be also similar, this is apparently for those skilled in the art, repeats no more this.Such as, thus stroke lock valve of the present invention and flexible control loop of hydraulic cylinder thereof to solve in hydraulic cylinder extension process in a certain working position because of accidental cause, and the misoperation that during bolt mechanism action, the cylinder barrel of oil hydraulic cylinder stretches out, improves flexible reliability thereupon.
In addition, as mentioned above, hydraulically extensible control loop of the present invention is also provided with relief valve 7, its role is to: when oil hydraulic cylinder 4 is normally flexible, the electromagnet Y1 of solenoid directional control valve 9 obtains electric, the solenoid directional control valve of stroke lock valve works in the second working state, and the conducting of stroke lock valve, system can normally be stretched.If but when normal stretching, control the circuit accidental damage of the electromagnet Y1 of solenoid directional control valve, or solenoid directional control valve burns out (selector valve of other form also exists damage situation), then stroke lock valve is closed.Now oil hydraulic pump is by oil-feed oil circuit 13 via the rodless cavity fuel feeding of working connection selector valve 1 to oil hydraulic cylinder, and therefore pressure is very high.Due to the rod chamber of oil hydraulic cylinder 4 and the volume of rodless cavity smaller, therefore the pressure of rod chamber can increase exponentially, if without relief valve 7, oil hydraulic cylinder 4 can burst.The oil pressure relief that relief valve 7 sets is less than the rupture pressure of oil hydraulic cylinder 4, thus protects oil hydraulic cylinder 4, improves Security.
By the above analysis to the specific embodiment of the invention, the technological points of the flexible control loop of hydraulic cylinder of this preferred implementation is to the first working oil path between working connection selector valve 1, to add stroke lock valve 2 at the rod chamber of oil hydraulic cylinder, and stroke lock valve is according to working condition requirement conducting or cut-off.
The present invention is not limited to above-mentioned embodiment, such as, oil hydraulic cylinder 4 in above-mentioned embodiment is only example, actual its can for having the various hydraulic fluid cylinder pressures of central oil passage, even if oil hydraulic cylinder does not have central oil passage, stroke lock valve of the present invention and flexible control loop of hydraulic cylinder thereof also can prevent the latch functions of this oil hydraulic cylinder a certain working position in telescopic process, prevent it from causing because of accidental cause extension member to be moved, especially can prevent extension member (such as cylinder barrel) from stretching out because of accidental cause.Meanwhile, as mentioned above, equilibrium valve 3 is not necessary, if stroke lock valve of the present invention and flexible control loop of hydraulic cylinder thereof are applied to the little hydraulic telescopic machanism of load, then can select whether adopt equilibrium valve 3 according to actual conditions.Fluid-controlled cut-off valve in stroke lock valve also can change to the controlled hydrovalve of other break-make, and certainly, in this case, corresponding shuttle valve 10, solenoid directional control valve 9 also can omit.
As can be seen from upper description, the invention has the advantages that by arranging switch valve on the first oil circuit control 15, thus the break-make of the first oil circuit control 15 can be controlled as required, when oil hydraulic cylinder stops at a certain working position because operation needs in telescopic process, by the first oil circuit control 15 is disconnected, can effectively realize preventing the extension member of oil hydraulic cylinder 4 (such as cylinder barrel) from continuing the stroke latch functions of stretching out because of accidental cause, thus guarantee hydraulic cylinder works reliability, which solve the oil hydraulic cylinder defect that the oil hydraulic cylinder that causes stretches out because central oil passage builds pressure or other accidental cause, relatively reliably achieve the static latch functions of oil hydraulic cylinder, especially the latch functions that the extension member of oil hydraulic cylinder stretches out is prevented.Meanwhile, the preferred embodiment for the present invention provides a kind of flexible control loop of hydraulic cylinder using stroke lock valve 2 as switch valve further, thus makes control more light sensitive, handles more accurately reliable.In addition, flexible control loop of hydraulic cylinder of the present invention preferably can also arrange relief valve, and it achieves the pressure protecting function to oil hydraulic cylinder under some fortuitous event, improves the safety reliability of system.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. flexible control loop of hydraulic cylinder, comprise and be connected to oil-feed oil circuit (13), oil return circuit (14), first working oil path (15) and the second working oil path (16) are for the working connection selector valve (1) realizing oil hydraulic cylinder (4) extension and contraction control, described first working oil path (15) and the second working oil path (16) are connected to rod chamber and the rodless cavity of described oil hydraulic cylinder (4), wherein, described first working oil path (15) is connected with the switch valve for controlling this first working oil path (15) break-make, described switch valve is stroke lock valve (2), the trip lock valve (2) comprises fluid-controlled cut-off valve (8), shuttle valve (10) and oil circuit control selector valve, described fluid-controlled cut-off valve (8) has the first hydraulic fluid port (E) be communicated with first import (C) of described shuttle valve (10), the second hydraulic fluid port (F) be communicated with second import (D) of this shuttle valve (10) and oil circuit control interface, the first paragraph of described first working oil path (15) is connected between described first hydraulic fluid port (E) and described working connection selector valve (1), and second segment is connected between the rod chamber of described second hydraulic fluid port (F) and described oil hydraulic cylinder (4), described oil circuit control selector valve connects and is optionally communicated with or is communicated with fuel tank with the outlet (I) of described shuttle valve (10) for controlling described oil circuit control interface, described fluid-controlled cut-off valve (8) makes described first hydraulic fluid port (E) and the second hydraulic fluid port (F) block each other when described oil circuit control interface has hydraulic oil input transmission of pressure, when described first hydraulic fluid port (E) or the second hydraulic fluid port (F) have hydraulic oil input transmission of pressure and described oil circuit control interface is communicated with fuel tank, described first hydraulic fluid port (E) and the second hydraulic fluid port (F) is communicated with each other.
2. flexible control loop of hydraulic cylinder according to claim 1, wherein, slide in the valve pocket of described fluid-controlled cut-off valve (8) and be provided with spool (11), this spool is formed with the second spool part that the first spool part and diameter are less than this first spool part, described valve pocket is divided into turnover oil pocket and the spring chamber (18) with the hydraulic control orifice of this fluid-controlled cut-off valve (8) by described first spool part sealing, described turnover oil pocket has conical cavity part (12), the spring of spool described in bias voltage is provided with in described spring chamber (18), described second spool part forms sealing linear contact lay with the taper inner circle wall of described conical cavity part (12) under the effect of described spring, this turnover oil pocket to be divided into the first oil pocket (19) be communicated with described first hydraulic fluid port (E) and the second oil pocket (20) be communicated with described second hydraulic fluid port (F).
3. flexible control loop of hydraulic cylinder according to claim 2, wherein, described fluid-controlled cut-off valve (8) also comprises the 3rd hydraulic fluid port (X) be communicated with described second oil pocket (20), and described second hydraulic fluid port (F) is communicated with second import (D) of described shuttle valve (10) by the 3rd hydraulic fluid port (X).
4. flexible control loop of hydraulic cylinder according to claim 1, wherein, described oil circuit control selector valve is electromagnetism two position three way directional control valve.
5. flexible control loop of hydraulic cylinder according to claim 1, wherein, also be parallel with relief valve (7) between first hydraulic fluid port (E) of described fluid-controlled cut-off valve (8) and the second hydraulic fluid port (F), the inlet opening of this relief valve (7) is communicated with the rod chamber of described oil hydraulic cylinder (4).
6. flexible control loop of hydraulic cylinder according to claim 1, wherein, described switch valve is electromagnetic switch valve or electromagnetism bi-bit bi-pass selector valve.
7. flexible control loop of hydraulic cylinder according to claim 6, wherein, described switch valve is also parallel with relief valve (7), and the inlet opening of this relief valve (7) is communicated with the rod chamber of described oil hydraulic cylinder (4).
8. require the flexible control loop of hydraulic cylinder according to any one of 1 to 7 according to power, wherein, described second working oil path (16) is also provided with equilibrium valve (3), the hydraulic control interface of this equilibrium valve (3) is connected on described first working oil path (15) between described working connection selector valve (1) and described switch valve by hydraulic control oil circuit (17), described hydraulic control oil circuit (17) is provided with oil purifier, and described working connection selector valve (1) is guide's hyraulic controlled type Y type three position four-way directional control valve.
9. engineering mechanical device, this project machinery comprises hydraulic telescopic machanism, and wherein, described hydraulic telescopic machanism has flexible control loop of hydraulic cylinder according to any one of claim 1 to 8.
10. engineering mechanical device according to claim 9, wherein, the center of described oil hydraulic cylinder (4) axis be provided with along this oil hydraulic cylinder runs through the piston rod of described oil hydraulic cylinder and is connected to the core pipe (5) of the cylinder barrel of this oil hydraulic cylinder, has central oil passage (6) in this core pipe (5).
11. engineering mechanical devices according to claim 10, wherein, described engineering mechanical device is hydraulic hoist, and described hydraulic telescopic machanism is the telescoping boom of this hydraulic hoist.
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| CN201110399920.1A CN102434529B (en) | 2011-12-06 | 2011-12-06 | Flexible control loop of hydraulic cylinder and engineering mechanical equipment |
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| CN201110399920.1A CN102434529B (en) | 2011-12-06 | 2011-12-06 | Flexible control loop of hydraulic cylinder and engineering mechanical equipment |
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| CN102434529B true CN102434529B (en) | 2015-03-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102661297B (en) * | 2012-05-30 | 2014-08-13 | 江苏扬力数控机床有限公司 | Hydraulic system of numerical control turrent punch press and working method of hydraulic system |
| CN102979769B (en) * | 2012-12-05 | 2015-08-05 | 中联重科股份有限公司 | The expansion control loop of oil hydraulic cylinder |
| CN102979778A (en) * | 2012-12-07 | 2013-03-20 | 中联重科股份有限公司 | Three-position six-way reversing valve, hydraulic control system and engineering vehicle |
| CN105625956B (en) * | 2014-10-31 | 2017-10-17 | 中国石油天然气股份有限公司 | Mechanical arm and its control method |
| CN107763769A (en) * | 2017-09-08 | 2018-03-06 | 国网山东省电力公司电力科学研究院 | Livewire work bucket arm vehicle insulation bucket hydraulic air conditioner system and method |
| CN108080595B (en) * | 2017-12-21 | 2023-12-05 | 宁波顺兴机械制造有限公司 | Edge cutting machine |
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| DE3128044A1 (en) * | 1981-07-16 | 1983-02-03 | Mannesmann Rexroth GmbH, 8770 Lohr | Device for actuating a double-acting working cylinder |
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